Method of controlling salt solution dissolution
FIELD: process engineering.
SUBSTANCE: invention relates to production of synthetic carnallite. Proposed method comprises stabilising dissolution temperature, stabilising useful component concentration in varying stock consumption and determining useful component in flows entering the process. In varying said consumption relative to preset magnitude, useful component consumption is adjusted. Useful component comprises, apart from potassium chloride, magnesium chloride. Its concentration on feed stock flow is stabilised by evaporation of magnesium chloride initial solution. Additionally, content of magnesium chloride in evaporated solution is measured to calculate flow rate of evaporated solution by the following expression: where is flow rate of evaporated magnesium chloride solution, t; GKCl is potassium chloride flow rate per 100% of the product, t; is specified content of MgCl2 in evaporated solution, 35±0.5 %. Calculated magnitude is loaded in solution consumption control system as a setting point.
EFFECT: higher accuracy of control.
The invention relates to techniques for managing the process of dissolution of potassium chloride in a concentrated solution of magnesium chloride and can be used in the process of obtaining synthetic carnallite in its synthesis and crystallization facilities vacuum crystallization.
A method of obtaining synthetic carnallite by reacting potassium chloride with magnesium chloride, followed by evaporation of the mixture at a temperature of 158-180°C to molecular ratio of components KCl MgCl2:H2O=1,0:1,0:3-5 - see A.S. USSR №448160, CL. C01F 5/30; C22D 3/08, 1974, bull. No. 40. Of the known method it is unclear what technical solutions manages the process of obtaining synthetic carnallite.
A method of obtaining synthetic carnallite, including mixing concentrated solutions of magnesium chloride to a suspension of potassium chloride at 75-80°C, followed by cooling the suspension crystallization, filtration of the product and refund of the uterine liquor to the step of mixing the raw materials, with a suspension of potassium chloride is heated to 75-85°C and fed to the mixture at a concentration of potassium chloride 7-8% - see A.S. USSR №582203, CL. C01F 5/30, 1977, bull. No. 44. In the known method is not technical solutions to manage the process of receiving carnallite.
The known method is automatic process control of dissolved salts prototype - see A.S. USSR №381374, CL. B01F 1/00, G05D 11/00, publ. 22.05.1973, bull. No. 22. The method includes stabilizing the temperature of the dissolution of salts and stabilizing the concentration of useful component in the solution by changing the flow rate of the raw material dissolution, determination of the useful component included in the process flow and changing the value of this flow relative to the setpoint adjustment expense useful component acting in the composition of raw materials.
The disadvantage of this method of automatic control is its low accuracy by dissolving potassium chloride in concentrated solutions of magnesium chloride, especially when you have a given ratio of KCl MgCl2in the suspension fed to the crystallization of synthetic carnallite.
The objective of the invention is to improve the accuracy of automatic control of the process of dissolution of potassium chloride in the solution of magnesium chloride to obtain a suspension with a given ratio of KCl MgCl2.
This object is achieved in that in contrast to the known method as a useful component, along with potassium chloride, entered magnesium chloride, the concentration of which in the input stream of raw stabilize the evaporation source of magnesium chloride, optionally measure the content of magnesium chloride in one stripped off the solution, calculate ashod one stripped off of the solution according to the following dependence:
where- one stripped off flow of a solution of magnesium chloride, t;
GKCl- consumption of potassium chloride in recalculation on 100% product t;
- routine maintenance MgCl2in one stripped off the solution, 35±0,5%,
and the calculated value serves as a job management system solution flow rate. When dissolved useful component (potassium chloride in a solution of magnesium chloride) part of it remains in suspension.
The essence of the method as a technical solution is as follows: in contrast to the known method, including stabilization of the temperature of dissolution, the stabilization of the concentration of the useful component in the solution by changing the flow rate of the raw material dissolution, determination of the useful component included in the process flow and changing the value of this flow relative to the setpoint adjustment expense useful component entering in the composition of the raw materials for the proposed method as a useful component, along with potassium chloride, entered magnesium chloride. In the production of synthetic carnallite from solutions of magnesium chloride and potassium chloride in contrast to the processing of carnallite ore is not formed large waste - halite blade and clay-salt slurry - see, for example, Salt is askie carnality, collection of scientific papers, 2007, S.-Pb, LICK, s-123.
Used in the production of potassium chloride, obtained from spent electrolyte magnesium plant, and the standard potassium chloride supplied to compensate for losses during electrolysis dehydrated carnallite and redistribution processing of the electrolyte.
Useful components of the chlorides of potassium and magnesium are relatively pure substances, and the flow of potassium chloride is variable. According to conducted studies of the dependence of consumption, one stripped off solution of magnesium chloride from the consumption of potassium chloride in the manufacture of synthetic carnallite is determined by dependence
where- one stripped off flow of a solution of magnesium chloride, t;
GKCl- consumption of potassium chloride in recalculation on 100% product t;
- routine maintenance MgCl2in one stripped off solution, %;
where Garticlethe consumption of standard potassium chloride, coming to replenish losses, t, in terms of 100% of the product;
Ge- consumption of potassium chloride, obtained from the electrolyte, t;
WithKCl- KCl content in the product obtained from the electrolyte.
amounted to -1,277 - multiplier with KCl on the anhydrous carnallite.
Loss of potassium chloride on the stages obasogie what I carnallite, its electrolysis and recycling of the electrolyte is determined by the specifics of production and are usually 10-20%, therefore, when entering a recovery factor of KCl on these conversions - α(0,8-0,9), we obtain the consumption of standard potassium chloride, depending on the consumption of potassium chloride, isolated from the electrolyte in the form of dependencies
in terms of 100% of the product
where- KCl content in a standard potassium chloride, %.
The total consumption of 100% potassium chloride will be
Consumption, one stripped off solution of magnesium chloride,will be
A necessary condition for obtaining the certified carnallite is the flow rate of the circulating liquor and the content of magnesium chloride in one stripped off the solution.
Usually scheduled value flow circulating circulating liquor stabilize calculation of ~2.7 tons per 1 ton of synthetic carnallite. Increased consumption leads to increased energy consumption for the heating and circulation, but reduces the amount of solid phase in suspension by dissolving potassium chloride. The decrease in consumption leads to contamination of synthetic carnallite by potassium chloride. Therefore, the optimum flow rate of the circulating solution is determined at the development of production and for replay as a routine indicator of the optimal circulation of the liquor - Ga circus..
When carrying out the process of dissolution of potassium chloride on the flushing of pipelines, equipment and other needs water. When the disturbance of the water balance of the process appear excessive working capital solutions, which must be removed from the process at the stage of evaporation of the source solution of magnesium chloride. The same effect will be obtained when there is insufficient Parke solution of magnesium chloride in relation to the scheduled value. When the concentration of MgCl2in one stripped off solution normalized over possible contamination of synthetic carnallite bischofite (MgCl2·6H2O), which will cause difficulties in further processing, was put on magnesium metal.
Therefore, it is also regulated by the concentration of one stripped off solution of chloride of magnesium is usually at 35±0,5% MgCl2.
The lack of circulating circulating solution, for example, during start-up of production in case of violations of the technological regime or repair of equipment, i.e. Gm<Ga circus.system contribute by supplying the necessary quantity of 27-30% solution of magnesium chloride, for example, with intermediate housings evaporator.
When the disturbance of the water balance of the process from the system to the residue output of the circulating mother liquor containing 28-30% of the chlorides of magnesium and calcium.
assaulta system water promotes the decomposition of carnallite and its contamination with potassium chloride. Therefore, it is necessary output MgCl2to compensate one stripped off with a solution of magnesium chloride with increased content of magnesium chloride. Adjustable concentration of magnesium chloride -- is determined by the following dependencies:
where Gwt.t - the amount of excess circulating liquor, defined by the equation Gwt.=Gm-Ga circus.;
Gm- consumption of uterine liquor obtained after the separation of suspensions of synthetic carnallite after vacuum crystallization, t;
Ga circus.- flow circulating circulating liquor entering the dissolution of potassium chloride is scheduled value t;
- concentration of MgCl2in the fallopian excessive liquor, %.
At steady state excess circulating liquor no - Gwt.=0;.
The calculated values of GArt.,, Gwt.andserved as the task management system flow one stripped off solution.
The dissolution of potassium chloride in the joint solution of magnesium chloride part KCl remains in a solid phase, however, upon further cooling, the suspension of the potassium chloride is dissolved in the solution with crystallization of sin is micheskogo carnallite.
An important factor in the stabilization process of dissolution is the temperature of the liquid phase, which is maintained in the range of 90-100°C by heating the circulating circulating liquor and selecting one stripped off solution of magnesium chloride from the last housing evaporator, where the solution has a maximum boiling point.
Thus, the task of improving the accuracy of automatic control of the process of dissolution of potassium chloride in the joint solution of magnesium chloride to obtain a suspension with a given ratio of KCl MgCl2while cooling which is formed of synthetic carnallite, quality all the requirements of the magnesium production.
The method is as follows. On stage dissolution serves potassium chloride, obtained from the electrolyte, potassium chloride standard to compensate for losses KCl, circulating circulating liquor from stage cooling, suspension and selection of synthetic carnallite heated to a temperature of ~100°C, and one stripped off the solution of magnesium chloride. The resulting suspension is intensively stirred and cooled to the crystallization of carnallite.
- consumption of potassium chloride, obtained from the electrolyte, with the weight of the dispenser, for example, by "Technocon";
- mass fraction of potassium in the flow of potassium chloride with potassium meter, for example, the company "Berthold is LB 377-62;
the content of magnesium chloride in one stripped off solution - analytical method or the density of the solution is adjusted to a temperature of, for example, using a primary Converter MFS 2000 and signal Converter MFS 081;
- expenses of circulating uterine and one stripped off the liquor by means of an electromagnetic flow meter, for example, type Metran 370;
- the temperature of the suspension by dissolving using a thermal Converter with unified output signal, such as a Converter of TSMU Metran 274.
Are scheduled rate value of the circulating liquor, Ga circus.the degree of extraction of potassium chloride to magnesium plant and in the loop processing of the electrolyte, α, routine concentration value of one stripped off solution of magnesium chloride,for example Ga circus.=2.7 t/t carnallite; α=0,8;.
On the dependencies calculate
The signals from the devices are received at the controller, where these dependencies are counting regulated concentration of magnesium chloride -consumption of one stripped off solutionconsumption of standard potassium chloride, and then the signals Postup who are the distributors of potassium chloride, one stripped off solution and system control the degree of evaporation of a solution of magnesium chloride, and optionally the system output excess fluids circulating liquor.
An example of the method
|- consumption of potassium chloride, obtained after processing|
|electrolyte, Get||for 10.68|
|the content of potassium chloride in this thread, CKCl, %||85,04|
|the content of potassium chloride in the standard chloride|
|potassium, WithKCl, %||96,90|
|- consumption of the mother lye. Gmt||122,57|
|the flow rate of the circulating liquor, Ga circus.t||122,57|
Asked scheduled value of the flow rate of the circulating liquor, Ga circus.equal to 2.7 t/t carnallite - 122,57 t, the degree of extraction of potassium chloride in magnesium and other productions, α=0.8, the maintenance and the concentration value of one stripped off solution of magnesium chloride,.
Depending on what we define consumption standard potassium chloride, calculated on 100% of the product
Determine the overall consumption of potassium chloride in recalculation on 100% of the product
Define consumption, one stripped off 34,5%-aqueous solution of magnesium chloride,.
We define the consumption of excess circulating liquor, Gwt.
Define regulated concentration of one stripped off solution of magnesium chloride
The calculation results filed in the system flow control standard potassium chloride, one stripped off solution of magnesium chloride and the degree of evaporation of a solution of magnesium chloride.
The method was carried out in accordance with example 1, but the reading of the instrument determined the flow of the mother liquor (Gm=129,90 so
Consumption of excess circulating liquor Gwt.=Gm-Ga circus.=129,90-122,57=7,33 so
The indication contents of magnesium chloride in it.
Define regulated concentration of one stripped off solution of magnesium chloride,.
This value was applied in the control system of the degree of evaporation of a solution of magnesium chloride. Gradually the flow of excess fluids decreased to 0, the concentration of the one stripped off races the thief fell to and.
Method for automatic process control of dissolved salts, including stabilization of the temperature of dissolution, the stabilization of the concentration of the useful component in the solution by changing the flow rate of the raw material dissolution, determination of the useful component included in the process flow and changing the value of this flow relative to the given value, the adjustment of the flow of useful component acting in the composition of the raw material, characterized in that as a useful component along with potassium chloride introduced magnesium chloride, the concentration of which in the input stream of raw stabilize the evaporation source solution of magnesium chloride, optionally measure the content of magnesium chloride in one stripped off the solution, calculate the flow rate of one stripped off of the solution according to the following dependence:
where- one stripped off flow of a solution of magnesium chloride, t;
- consumption of potassium chloride in recalculation on 100% product t;
- routine maintenance MgCl2in one stripped off the solution, 35±0,5%,
and the calculated value serves as a job management system solution flow rate.
SUBSTANCE: method comprises the following steps: (a) feeding a stream containing carbon and an oxygen-containing stream into a reactor in given ratio O/C, (b) at least partial oxidation of the stream containing carbon in a gasification reactor to form a gaseous stream of a product containing at least synthetic gas, CO2 and CH4, (c) determining content of CO2 in the stream of product obtained at step (b), (d) comparing content of CO2 determined at step (c) with predetermined content of CO2 as a result of which the value of the difference between content determined at step (c) and the predetermined content can be obtained, (e) controlling the ratio O/C at step (a) based on the difference value obtained at step (d), where 'O' denotes mass flow of molecular oxygen O2, which is present in the oxygen-containing stream, and 'C' denotes mass flow of material containing carbon, except any optional carrier gas or water.
EFFECT: high accuracy of controlling quality of the product.
9 cl, 1 dwg, 1 tbl
FIELD: instrument making.
SUBSTANCE: main and auxiliary materials are added at speeds of transition process flows or stabilised condition depending on value of control signal. Actual speeds of flows monitor command speeds of flow. Device provides for dynamic control over instant and integral error for specified range of control.
EFFECT: expansion of functional capabilities.
16 cl, 10 dwg
FIELD: physics; control.
SUBSTANCE: invention relates to methods and devices for regulating processes and can be used in chemical industry during production of cyclohexane. The method of regulating streams in the production of cyclohexane comprises heat exchangers, condensers, hydrogen and benzene hydrogenation reactors, an end product cooler, a separator with benzene and hydrogen flow valves and sensors, temperature sensors in the hydrogenation reactors, level sensors in the end product cooler, connected to a controller. The method also comprises a benzene circulation loop with a pump, a container and a pressure sensor, collectors for distributing benzene and hydrogen to standby units, apparatus for removing trace impurities from benzene, a liquid cyclohexane pipe, shut-off valves, additional temperatures sensors in hydrogen and benzene hydrogenation reactors, and a pressure and residual gas flow sensor. Benzene and hydrogen are fed from the container with a pump and shut-off valves along the circulation loop to benzene and hydrogen distribution controllers. The initial mixture is heated and directed through heat exchangers and shut-off valves into the apparatus for removing trace impurities from benzene and into hydrogen and benzene hydrogenation reactors. The weighted average temperature of the mixture is determined and is regulated through supply of condensate.
EFFECT: wider range of application, increased output and quality of obtained cyclohexane.
2 cl, 2 dwg, 1 tbl
FIELD: oil-and-gas production.
SUBSTANCE: invention related to oil-and-gas production and meant multiphase fluid for oil and gas composition analysis. Method executed in on - line regime. From the sources flow transported as a mixed flow via single pipeline. In and after the pipeline execute composition measurements, at least on of the mixed flow phases. It is analysed with device, which uses mixed flow fluid probes, the measurement results sent to computing device, which calculates flow form every source with help of separation algorithm that uses measured mixed flow, analysed composition of at least one phase, associated with every source.
EFFECT: distribution of backward flow to well or reservoir reliability increase in oil and/or gas production systems.
24 cl, 4 dwg
SUBSTANCE: first version of the method involves the following steps: distillation of a mixture which contains methyl iodide and acetaldehyde in a distillation apparatus in order to obtain an overhead fraction and a residue, measuring density of the said overhead fraction, determination of relative concentration of methyl iodide, acetaldehyde or both in the overhead fraction based on the measured density and regulation of at least one process variable, associated with the said distillation apparatus. As a response reaction to the said measured density or relative concentration calculated from the measured density, the said process variable is selected from heating intensity, column pressure, the composition fed, condensate composition and coefficient of flow reversal.
EFFECT: effective reduction of amount and removal of acetaldehyde and methyl iodide from a carbonylation system.
6 cl, 5 dwg
FIELD: personal demand items.
SUBSTANCE: measurement of density of aerated food product during its making is performed on aerated product in area past shear processing node used for formation of aerated material; at that, far enough from the node in order to maintain product in balanced condition. Then rate of aeration gas injection in area before shear processing node may be determined in order to equalise the difference between preset and measured density of product. Besides gas injection with lower solubility may be used in order to reduce time required for product density balance. Disturbances of density of formulation base material earlier in the process also may be monitored and compensated by means of gas flow rate control in order to support maintaining of desired density of product.
EFFECT: safe monitoring of product density.
20 cl, 12 dwg, 2 tbl, 4 ex
FIELD: physics, measurements.
SUBSTANCE: invention is related to facilities for odorisation of natural gases and may be used in gas, oil and other industries. The result is provided due to the fact that working, consumption tanks are used, as well as reservoir for storage of odorant, which are connected between other by pipelines, odorant is supplied into working reservoir from reservoir for its storage by means of creation of pressure difference between reservoir for its storage and working reservoir, afterwards, odorant is pumped from working reservoir into consumption reservoir, from which odorant is dosed into gas line, proportionally to gas consumption. Besides odorant is pumped from working reservoir into consumption reservoir by excess pressure from high pressure gas line, and in consumption reservoir pressure is created, which is equal to pressure in low pressure gas line, level of odorant in consumption reservoir is maintained as permanent with the help of float valve, and in working reservoir odorant level is controlled by detectors of upper and lower levels, process of working reservoir filling with odorant and its pumping into consumption reservoir is done by signals from level detectors with the help of electric valves, and batching is done from system of commercial accounting of gas consumption.
EFFECT: higher accuracy of batching.
SUBSTANCE: system for control of loose components blending additionally comprises the following components for blending of uncontrolled loose component of mixture: serially connected hopper-accumulator tank and transporter track for component supply into blended stack, serially connected scales installed on transporter track, and unit-accumulator counter for information summation on current weight of component. To blend every of dosed loose components of mixture, there are serially connected hopper-accumulator tanks according to the number of mentioned components, feeders, transporter tracks of components supply into blended stack, scales serially connected in compliance with mentioned components and installed on transporter tracks, and unit-accumulator counters for information summation on current weight of every dosed components, multiplication units that are serially connected in compliance with the number of mentioned components, control inputs of which are connected to output of unit for comparison of ratios of the amounts of current and required uncontrolled and dosed loose components of mixture, units of PID-controllers, other outputs of which are connected to appropriate information outputs of scales of every dosed loose components, and feeders, and also unit-information table, inputs of which are connected to appropriate information outputs of scales of uncontrolled loose component, scales of every dosed loose component of mixture and unit-setter for operator to set required ratio of scales of uncontrolled and dosed loose components of mixture, at that the second input of unit for comparison of ratios of the amounts of current and required uncontrolled and dosed loose components is connected to appropriate information output of unit-accumulator counter for information summation on current weight of uncontrolled loose component of mixture, and the first and second information outputs of unit-accumulator counters of information summation on current weight of every dosed components of mixture are connected accordingly to the third input of unit for comparison of ratios of the amounts of current and required uncontrolled and dosed loose components of mixture and input of unit-setter for operator to set required ratios of mixture components weights, the other information output of which is connected to appropriate inputs of multiplication unit.
EFFECT: increased efficiency of control and improved productivity.
FIELD: heat and power engineering.
SUBSTANCE: invention can be used in the boiler houses and the thermal electric power stations. The system for preparing the makeup water of the heat supply systems contains the deaerator to which the source and deaerated water pipes, container with alkali, alkali pipeline connected after the dispensing pump and connected with the deaerated water pipeline are installed. The system is supplied with the deaerated water pH controller connected with the processed water pH sensor which is installed at the deaerated water pipeline after the point of the alkali pipeline connection, as well as with the converter of the rotating frequency of the dispensing pump electric drive.
EFFECT: improved quality of makeup water preparation.
FIELD: automation and management of technological processes.
SUBSTANCE: in the process of management of gasoline mixing station, characteristics of quality of mixture components and product at input and output of mixing collector are measured in each regulation cycle, values of time delays of mixture components with mixing collector and duration of mixing of components in mixing collector are determined, and forming of controlling influences is synchronized with moments of querying of product and mixture component quality analyzers at output and input of mixing collector with consideration of technological delays of mixture components in pipelines and in mixing collector. Adjustment of flow of mixture components is performed by realization of iteration procedure, which minimizes the number of measuring operations.
EFFECT: increased quality of product, increased productivity of mixing station and improved economical characteristics of the compounding process.
7 cl, 2 dwg
SUBSTANCE: invention can be used to produce magnesium chloride, silica and red pigment. Serpentinite calcined at 680-750°C is treated with 4-8% hydrochloric acid solution with weight ratio of serpentinite to hydrochloric acid equal to 1:(15-40). The hot pulp is then decanted and filtered. The residue is dried to obtain silica, the filtrate is evaporated and silicic acid is separated. After separating silicic acid in form of sol-gel, hydrochloric acid is added to a solution containing magnesium and iron (III) chlorides until 4-8% hydrochloric acid solution is obtained. The obtained hydrochloric acid solution is used to treat a new portion of serpentinite. Further, the decantation, filtration, evaporation of filtrate, separation of silicic acid and treatment of the obtained solution with hydrochloric acid are repeated 3-5 times using new portions of calcined serpentinite. The solution concentrated that way at 90°C is mixed with serpentinite and filtered. Magnesium chloride is separated from the residue which contains iron (III) hydroxide. Said residue is treated at 350-400°C to obtain red pigment.
EFFECT: invention simplifies the processing serpentinite, improves environmental safety and reduces expenses and wastes.
1 dwg, 1 ex
SUBSTANCE: invention can be used in production of synthetic carnallite. Proposed method comprises adjusting ore feed depending upon the content of useful component in inlet flows and measurement of temperature. Besides solvent flow rate, solvent density and content of magnesium chloride therein and content of potassium chloride in carnallite ore flow are measured. Parametres thus obtained allow determining carnallite ore flow rate from the relationship indicated below to make setting to be incorporated with ore consumption control system: where Gore is the consumption of carnallite ore, t; Gsol is the consumption of solvent, t; is the content of potassium chloride in carnallite ore, %; is the content of free potassium chloride not bound in carnallite, %; is the content of magnesium chloride in saturated solution set by enterprise operating conditions to make 28.5±0.5%; is the content of magnesium chloride in solvent, %.
EFFECT: simplified dissolution of carnallite ore.
2 cl, 2 tbl, 2 ex
SUBSTANCE: invention relates to chemistry and can be used in production of mineral salts. An aqueous solution of a mixture of potassium nitrate and magnesium chloride is heated until dissolution of the solid phase, where content of the mixture of magnesium nitrate and potassium chloride in the aqueous solution is 48.0-52.0 wt % mass ratio KCl:Mg(NO3)2 is in the range (41.5-47.0):(53.0-58.5) respectively. The obtained mixture is cooled to temperature close to room temperature in order to crystallise potassium nitrate which is then separated from the mother solution through filtration. The mother solution is evaporated until formation of a dihydrate of magnesium chloride and the remaining mother solution which is saturated with magnesium nitrate is used to prepare the initial mixture.
EFFECT: invention enables to obtain potassium nitrate and magnesium chloride in a closed cycle.
2 dwg, 1 tbl, 3 ex
SUBSTANCE: aqueous solutions of metal chlorides are successively treated with an oxidant and a calcium chloride source and/or barium chloride source with molar ratio of oxidant and divalent iron ions in the range (0.95-1.90):1.0 and molar ratio of calcium chloride and/or barium chloride and sulphate ions in the range (0.9-1.1):1.0 with subsequent coprecipitation of a hydrate of iron (III) oxide and calcium sulphate and/or barium sulphate at pH of the reaction medium between 5.0 and 9.5 and separation of the liquid and solid phase of the suspension.
EFFECT: invention increases degree of purification of solutions, efficiency of the process and allows for carrying out the process in continuous mode.
14 cl, 1 tbl, 5 ex
SUBSTANCE: magnesium chloride and worked out melted electrolyte of magnesium and chlorine preparation electrolytic process are loaded to the vessel in magnesium/chlorine mass ratio equal 1:(1-1,2) respectively. The components are mixed, heated up to temperature exceeding the crystallisation temperature of mixture salts at 200-400°C. Obtained synthetic carnallite in the melt form is decanted, the clarified part is separated and supplied to the electrolytic magnesium and chlorine preparation process. The aforementioned vessel is chlorator melting pot or the stationary carnallite furnace.
EFFECT: process simplification, energy consumption and material expenses decrease.
6 cl, 3 ex
FIELD: chemistry; metallurgy.
SUBSTANCE: present invention pertains to metallurgy and chemistry of inorganic substances. According to the invention serpentinite is leached with hydrochloric acid. The suspension is filtered, obtaining magnesium chlorate solution and silicon dioxide. Impurities are removed from the magnesium chlorate solution through neutralisation, obtaining a nickel-iron concentrate. Carnallite is produced from the purified magnesium chlorate solution and spent electrolyte. The carnallite is dehydrated and subjected to electrolysis, obtaining magnesium, chlorine and spent electrolyte. The nickel-iron concentrate is leached by 10-15% hydrochloric acid at temperature 80°C and pH 3-5. The suspension is filtered, obtaining an iron-containing residue and a solution, containing nickel chloride. Nickel compounds are extracted from the solution containing nickel chloride by treatment with a solution of sodium hydroxide at pH=8.0-8.5. The residue is washed in water soluble salts-chlorides, dried and calcinated, obtaining a nickel concentrate.
EFFECT: increased concentration of nickel oxide in the nickel concentrate.
2 cl, 1 tbl, 1 ex
SUBSTANCE: hydrates of chlorides of alkali earth metals are obtained by evaporation or drying water solutions of chlorides of alkali earth metals at temperature ranging from 115 to 250°C in the presence of a reducing compound, taken in quantity of 0.005-0.1% of the mass of the anhydrous metal chloride. The reducing compound can be a compound, chosen from a group consisting of urea, formaldehyde, formaldehyde polymers, hydrazine-hydrate, hydrazine hydrochloride, sodium hydrosulphide, sodium sulphite, potassium sulphite, sodium hydrosulphite, sodium nitrite, in form of individual compounds or in form of different mixtures.
EFFECT: obtaining hydrates of chlorides of alkali earth metals with given water content and content of metal chloride and simplification of the process.
9 cl, 4 ex, 1 tbl
SUBSTANCE: naturally occurring brine is heated in a vessel to 95-105°C at pressure not higher than atmospheric and crystallization is then carried out on the surface of rotary drum disposed in the vessel and heated to 105-117°C. Process is effected in continuous operation mode.
EFFECT: reduced production cost.
FIELD: chemical industry; methods of production of the artificial carnallite.
SUBSTANCE: the invention is pertaining to the method of production of the artificial carnallite. The method of production of the carnallite includes mixing of the heated concentrated solutions containing potassium and magnesium chlorides, with the potassium chloride in the mass ratio of the solution equal to MgCl2:KCl = (3.2-7.9):1, cooling of the suspensions with crystallization, filtration the carnallite crystallizate, dissolution in the mother liquor at the temperature of 115°С of the waste electrolyte of the magnesium production and feeding of the produced solution for lixiviation of the magnesium chloride from the ore in the chamber of the underground lixiviation. Dissolution of the waste electrolyte of the magnesium production is conducted in the part of the mother liquor in the presence of the water or the sewage of the magnesium production containing magnesium, potassium, sodium chlorides for maintaining the water balance of the process of production of carnallite with reception of the solution containing 4-7 % of potassium chloride. The share of the magnesium chloride in the solution at the chamber outlet of the underground lixiviation is maintained at the level of 28-30 %.The solution received at the outlet of the chamber of the underground lixiviation is subjected to evaporation up to the share of MgCl2 in it at the level of 30-33 % and feed for mixing with the suspension of potassium chloride in the remained heated mother liquor. The method increases the share of extraction of potassium from the raw materials and the recycling solutions into the target product.
EFFECT: the invention ensures the increased share of extraction of potassium from the raw materials and the recycling solutions into the target product.
1 tbl, 2 ex
FIELD: non-ferrous metallurgy, namely methods for preparing chlorine-magnesium raw material- carnallite for electrolytic production of magnesium.
SUBSTANCE: method for chemically removing impurities from chlorine-magnesium melt comprises steps of melting solid dehydrated carnallite in vessel; treating prepared chlorine-magnesium melt by means of chemical reagent and agitating it; using as chemical reagent magnesium granules in salt envelope containing, mass%: metallic magnesium, 50 -95; chlorides of magnesium, potassium, calcium produced from salt casting waste materials of magnesium production by disintegration and separation to magnesium granules in salt envelope and to salt phase. Chemical reagent is fed onto surface or under layer of chlorine-magnesium melt. Chlorine-magnesium melt is treated in chlorinator or in furnace or in vacuum-ladle.
EFFECT: lowered consumption of chemical reagent for removing impurities from melt and therefore lowered expenses due to using relatively cheap reagent -magnesium granules in salt envelope, reduced outbursts to environment.
7 cl, 3 ex
SUBSTANCE: invention can be used in the food industry. The method of producing iodised table salt involves adding iodine-containing substances to brine and treating the brine with iodine-containing substances with ultrasound in cavitation mode at ultrasound frequency higher than 18 kHz and intensity higher than 4 W/cm2. The ultrasound exposure time is not less than 4 minutes. Ultrasonic treatment begins at brine temperature which differs from boiling point by not more than 30°C. Ultrasonic treatment is carried out and iodine-containing additives are added only to a portion of brine, wherein concentration of iodine-containing substances is not more than 200 mg/kg of salt. Salt which crystallises during ultrasonic treatment and which contains iodine-containing additives is mixed with non-iodised salt until achieving concentration of iodine-containing substances of 40±15 mg/kg of salt. Brine which contains iodine-containing additives can be mixed with brine which does not contain additives until achieving said concentration of iodine-containing substances.
EFFECT: invention reduces power consumption when iodising salt by 3-5 times and prolongs shelf life of the obtained product.
2 cl, 1 ex