Method to control silvinite ore dissolution |
|
IPC classes for russian patent Method to control silvinite ore dissolution (RU 2398620):
                              
 Method for control of operation mode of coke dry-quenching plant and device for its realisation / 2398005
Invention can be used in chemical-recovery industry. Coke is loaded into coke-cooler plenum 8. Circulating gases are removed from coke-cooler plenum 8 with the help of draft system 7 and supplied into waste heat boiler 2. Produced superheated steam is removed from waste heat boiler 2 along steam line 9. Downstream waste heat boiler 2 circulating gases again arrive into coke-cooler plenum 8. In order to control actual flow rate of circulating gases and maintenance of superheated steam temperature at specified level, data obtained from superheated steam temperature sensor 1, sensor 3 of circulating gases temperature at the inlet to waste heat boiler 2, sensor 4 of circulating gases temperature at the outlet from waste heat boiler 2 and sensor 5 of circulating gases flow rate is sent to control unit 6. After processing of obtained data, control unit 6 generates signal of draft system 7 control.
 Hydroformylation process stabilisation / 2388742
Present invention relates to versions of a method of stabilising the hydroformylation process and a device for realising the said method. One version of the method involves reaction of one or more reagents, carbon monoxide and hydrogen in the presence of a hydroformylation catalyst to obtain an exhaust gas stream and a reaction product stream which contains one or more products, in which the method described above is realised at such partial pressure of carbon monoxide that, the rate of reaction increases when partial pressure of carbon monoxide falls, and falls when partial pressure of carbon monoxide increases; and in which the following steps of the process for stabilising the rate of reaction, total pressure, speed of the exhaust gas stream, reaction temperature or combinations thereof are carried out, process steps including at least one of the following process control schemata, selected from: Scheme A: (a1) setting a given total pressure; (a2) determination of total pressure and determination of the difference between the measured total pressure and the given total pressure; and (a3) based on the pressure difference measured at step (a2), manipulation of the stream of incoming gas which contains carbon monoxide in order to balance the measured total pressure to virtually the given total pressure; and Scheme B: (b1) setting a given speed of the exhaust gas stream; (b2) determination of the speed of the exhaust gas stream and determination of the difference between the measured speed of the exhaust gas stream and the given speed of the exhaust gas stream; and (b3) manipulation of the speed of incoming gas which contains carbon monoxide based on the difference in the speed of the exhaust gas stream measured at step (b2) in order to equalise the determined speed of the exhaust gas stream virtually with the given speed of the exhaust gas stream.
 Reagent dosing method and equipment for implementation / 2382813
Group of inventions related to oil industry, to dosing methods and equipment of reagents, such as demulsifying agents and corrosion inhibitors - oil development and preparation at fields and can be used at oil treatment and water preliminary discharge plants. Preliminary equalise pressure in a reagent tank and accompanying oil gas pipeline. Then regulate reagent flow rate, compare measured with flow metre reagent flow rate value in regulator with reagent flow rate target value, and according hose values difference create a control signal to a control valve, installed on pipe connecting nozzle to the tank. Device contains sealed tank with reagent, located over the pipeline top generating line. A section of a smaller diametre with nozzle mounted into the pipeline. The nozzle connected to the tank via pipeline, with reagent flow metre, connected to the regulator, reagent target flow rate signal transferred to the second end it, and outlet connected with control valve, installed on the pipe connecting nozzle to the tank. The reagent tank connected to the accompanying oil gas pipeline with equaliszing line.
 Method of automatic control of ion-exchange sorption of amino acids from waste water / 2379107
Invention relates to a method of automatic control of ion-exchange sorption of amino acids from waste water and can be used in chemical, food and other industries. The method of automatic control of ion-exchange sorption of amino acids from waste water involves controlling concentration of components of waste water, measuring flow of liquid solutions and their level in reservoirs. Information on flow of the process of ion-exchange sorption of amino acids from waste water is sent to sensors for monitoring level in containers of incoming water, distillate and desorbing solution, acidity of incoming water and during its flow into ion-exchange columns, temperature of the distillate and desorbing solution, concentration of the target component in the incoming water and water at the outlet of the ion-exchange columns and flow through secondary devices, a microprocessor and digital-to-analogue converters to actuating mechanisms for changing parametres of operation of the equipment depending on selected criteria.
 Method of controlling process of removing reduced permanganate compounds when using methanol carbonylation technology / 2376276
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.
 Method for definition of moisture condensation conditions in mixing of two air flows and device for its realisation / 2368936
Stated invention is related to method and device, and may be used in the field of automation of mixed air flows parametres control in ventilation systems. Device for method realisation comprises metres of initial values of temperature and moisture content of mixed flows, metre of barometric pressure, outlets of which are connected to inputs of initial parametres processing and setting. Besides outlet of initial parametres processing and setting is connected to inlet of functional converter of temperature differences, and outlet of functional converter is connected with inlet of computing unit. Also outlet of computing unit is connected to inlet of temperature difference sign analysis unit, outlet of which is connected to inlet of outlet signal generator. Device outlet is outlet of outlet signal generator.
 Method of regulating thermal decomposition of oil residues in tube furnaces / 2367679
Method involves measurement of a temperature parametre, comparison the actual temperature parametre with a given parametre and, depending on the difference value, reduction of this value by changing flow of fuel to burners of the corresponding section coil pipe of the furnace. The temperature parametre used is the temperature profile along the coil pipe and the given temperature profile for each section of the coil pipe is calculated using the formula
 Method for operating mode of caprolactam production / 2366651
Invention refers to the method for operating mode of caprolactam production from benzene carried out in the plant with one process line including the stations of benzene hydrogenation with hydrogen, cyclohexane oxidation with oxygen, cyclohexanone rectification, oximation, cyclohexanone oxim rearrangement to caprolactam, neutralisation of the reaction mixture with ammonia and mixing of caprolactam. The said stations are connected with pumps, pipelines with sensors and valves for consumption control of benzene, hydrogen, cyclohexanone, hydroxylamine sulphate and oleum, sensor of acid value and pH-metre of caprolactam. The said line contains additionally the second process line of caprolactam production from phenol including the stations of phenol hydrogenation with hydrogen, dehydrogenation of cyclohexanol with circulation circuit including: pump - station of cyclohexanol dehydrogenation - station of cyclohexanone rectification - pump, station of cyclohexanone rectification, oximation with hydroxylamine sulphate, rearrangement of cyclohexanon oxim to caprolactam and neutralisation of the reaction mixture with ammonia connected by pumps and pipelines with sensors and valves for control of benzene, hydrogen, cyclohexanone, hydroxylamine sulphate and oleum consumption, sensor of acid value and pH-metre of caprolactam and contains the device of benzene-phenol ratio connected with stations of benzene and phenol hydrogenation, oxidation and dehydrogenation; device of cyclohexanone distribution to the oximation stations connected with rectification stations and (through the cyclohexanone mixing tank) with the oximation stations; device of crystalline caprolactam switch-over to liquid caprolactam connected with caprolactam mixer, concentrator of crystalline caprolactam and tank of liquid caprolactam. The total caprolactam capacity, benzene-phenol ratio, cyclohexanone distribution to oximation stations, shipping of crystalline and liquid caprolactam to customers are set up; the consumption of benzene, phenol, hydrogen, cyclohexanone, hydroxylamine sulphate and oleum are corrected with corresponding valves.
 Production area environmental control device / 2363031
Invention relates to instrument making and can be used to control production area environments. Proposed device comprises regulator unit, control unit, temperature pickup, noise and illumination pickups. It also includes transducers of signals generated by the temperature, noise and illumination pickups. It incorporates setters of maximum and minimum tolerable temperatures, maximum tolerable noise and maximum tolerable illumination. The device includes comparator for every aforesaid setter and logical elements for every aforesaid controlled parametre. It incorporates the 1st , 2nd, 3rd and 4th logical elements, read-only memories for all controlled parametres, shift registers and counters of all aforesaid parametres. In compliance with this invention, the proposed device additionally comprises I/O units, communication unit, satellite receiver unit, power supply monitor, power buffer, ADC, real-time clock unit, RAM, nonvolatile memory unit. It incorporates, further on, real-time clock storage battery, relative humidity pickup with amplifier, airflow speed pickup with amplifier, environment heat load intensity pickup with amplifier, carbon oxide concentration pickup with amplifier, sulfur oxide concentration pickup with amplifier, nitrogen oxide concentration pickup with amplifier, ozone concentration pickup with amplifier, town gas concentration pickup with amplifier, power supply voltage pickup with amplifier and power supply.
 Method for control of potassium chloride preparation / 2359909
Invention can be used in the process of potassium chloride preparation by the method of solution-crystallisation. The method for the control of the aforesaid process by the way of input water flow varying includes: 1) the adjustment of water flow fed into crystallisation alkali liquor depending on potassium chloride concentration in the liquor and water consumption for washing of crystallisation apparatus; 2) detection of the temperature, density and consumption of alkali liquor. The said measurements allow to determine the sodium chloride content in the alkali liquor. The crystallisation water consumption is calculated on the basis of the obtained data according to proposed equation; the calculated values are input as assignment to the system of water consumption control.
 Device for processing of sylvinite-carnallite raw materials / 2369558
Device for processing of sylvinite-carnallite raw materials includes the following components installed along with flow - lye clarifier, two dissolving apparatuses connected to each other, augers and drier. Dissolving apparatuses are installed vertically along flow one after another and are connected to each other by means of transport auger. The last of apparatuses is connected to drier via dehydration auger installed at the angle of at least 15°. Inside each dissolving apparatus, coaxially to flow, there is a column installed for processing of mix with alternating feeding and grounding electrodes installed in them. Walls of column for processing of mix and dissolving apparatus create a tube space for lye drain.
Potassium chloride obtaining method from sylvinite ore / 2366607
Method involves ore crushing, mill pulverising, sludge removal, grouping of desludged ore suspension. Coarse fraction of desludged ore suspension with density of 60-70% of solid matter is conditioned with emulsion of reagents, which is taken in quantity of 60-70% of total reagent flow; then, coarse fraction is combined with small fraction of desludged ore suspension with density of 30-40% of solid solid matter and supplied to the combined floatation. At that, the rest part of the emulsion of reagents is supplied in parts immediately to the combined floatation process thus obtaining crude concentrate and remainders. Crude concentrate is processed thus obtaining the finished product, and floatation remainders are grouped, small fraction of remainders is supplied to the dump pit, and coarse one - to the mill to be pulverised. When coarse fraction of ore suspension is being conditioned, water solution containing hydrochloride of high-molecular amine, oksal and catalytic gas oil at mass ratio of 1:0.4:0.4 correspondingly is used as emulsion of reagents.
 Method of controlling process of sylvinite ore dissolution / 2352385
Invention relates to technique of controlling processes of sylvinite ores dissolution and can be used in production of potassium chloride by dissolution-crystallisation method. Method of controlling processes of sylvinite ores dissolution includes regulation of ore supply depending on content of useful component in input flows, measuring ready solution temperature and determining sodium chloride content in solution by calculation method. Additionally determined are density, temperature and consumption of dissolving solution, content of sodium chloride in it is determined by content of useful component, density and temperature. Ore supply is calculated according to suggested equation and calculated value is given as task to system of weigher control.
 Method of producing brine for electrolysis / 2347746
Present invention can be used for obtaining aqueous saturated solutions of alkali metal halides, which are used in the production of chlorine and alkali from electrolysis. The method of producing aqueous saturated brine of alkali metal halides involves underground dissolving of salt deposits with simultaneous purification of brine in the brine production well. Purification from toxic impurities - calcium and magnesium compounds is done using spent brine of a halide of the corresponding metal as the solvent, obtained from an electrolysis unit with pH 9-12. The brine from the well is then purified from calcium and magnesium compounds.
Method for processing salt rejects of magnesium production / 2316604
Method comprises steps of grinding salt rejects material; leaching them by means of concentrated solution of potassium chloride; separating mother liquor and solid potassium chloride; washing potassium chloride and drying potassium chloride; before washing procedure, dissolving solid potassium chloride in water at temperature 70 - 90°C; filtering solution and cooling filtrate till temperature 10 - 25°C; filtering received suspension of potassium chloride; washing deposit by means of potassium chloride solution with concentration 300 - 350 g/dm3 and filtering it; returning prepared filtrate for leaching salt rejects material.
Method of separation of potassium chloride / 2315713
Proposed method includes dissolving of sylvinite, clarification of hot saturated lye, crystallization of product in presence of fluoro-reagents, thickening and filtration of suspension and treatment of non-clarified saturated lye. Clarified saturated lye is treated with hot solution saturated with potassium chloride before crystallization of product. Potassium chloride solution is obtained by dissolving off-grade floatation potassium chloride in water. Off-grade floatation potassium chloride is just cyclone dust, fine fractions of floatation product or filtered-off intermediate product used for forming sludge suspension which is clarified and is thickened after clarification and is directed for treatment of non-clarified saturated lye.
Potassium chloride and sodium chloride production process / 2307790
Invention is intended for use in chemical and mining industries to manufacture mineral fertilizers and food salts. Ground sylvinite ore is dissolved in recycled potassium chloride-saturated lye. Resulting solution is directed at a rate of 0.03-0.15 m/s to leaching in the first dissolution column, with its electrodes connected to one of a current source poles, and treated by low-frequency (1-5 Hz) alternating electric field at voltage 30-100 v. Solution thus enriched with potassium chloride is fed together with solid phase into the downstream second dissolution column with its electrodes connected to opposite pole of the current source. Treatment by alternating electric field in the second column is effected under the same conditions as in the first column. Two-step leaching results in potassium chloride solution and sodium chloride-enriched solid phase. Separated sodium chloride is sent to production of food salt. Potassium chloride is separated from solution via crystallization.
 A method of obtaining a crystal of potassium chloride from the cyclone dust potash ore flotation concentrate / 2232130
The invention relates to the processing of sylvinite ores in potash and is intended for the production of white potassium chloride from the cyclone dust flotation concentrate
 The method of obtaining dust-free potassium fertilizers / 2215717
The invention relates to techniques for the production of potassium chloride from sylvinite ores with low content of dust fractions
 Device for vibration mixing of powdery materials / 2397013
Invention is intended to mix powdery materials and may be used to prepare loose even mixtures in machine building, pharmaceutical, chemical, food and other industries. Reservoir for powdery materials rests onto vessel via shock absorbers. Vibration exciter with eccentric fixed on shaft is connected to drive. Shock absorbers are arranged as adjustable in the form of permanent magnet pairs installed to each other with identical poles in holes of body with radial gaps. Piezoelectric vibration exciter is attached to reservoir for powdery materials.
|
FIELD: process engineering. SUBSTANCE: invention can be used in production of potassium chloride. Proposed method comprises control over ore feed subject to content of useful component in inlet flows, measurement of ready solution temperature, density, temperature and consumption of dissolving solution. Additionally, content of potassium chloride in ready solution is measured after its defecation, as well as its consumption. Obtained data and temperature are used to determine roe feed to correct its main flow in compliance with the following relation, and calculated magnitudes are entered in proportioner control system: EFFECT: higher accuracy of control over silvinite ore dissolution. 1 tbl, 2 ex
The invention relates to a technique of managing the processes of dissolution of sylvinite ore containing potassium salts, and can be used in the production of potassium chloride by the method of dissolution-crystallization. The known method for automatic process control leaching of potassium chloride of potash, by changing the flow rate input streams - see A.S. USSR №1060569, CL CO1D 3/08; G05D 27/00. Publ. 15.12.83. Bull. No. 46. In the proposed method the total flow of water to the composition of the input streams, regulate, depending on the consumption of liquor with correction for water consumption for flushing apparatus, consumption, recycling salt solution, the density of the salt solution and the circulating liquor, the total consumption of potassium chloride in the composition of the input streams, the concentration of potassium chloride in a saturated liquor and the temperature of the liquor will impact on the flow of liquor into the machine. The method differs insufficient regulation accuracy, since its implementation is impossible without the implementation of a complete chemical analysis of the input streams to determine the water content of the system. Analytical control is a lengthy process, as it involves sampling, preparation for analysis and determination of components in the system KCl-NaCl-H2O in the presence of MgCl2and other impurities. The results of the analysis do the production of potassium chloride with a delay of 3-4 hours, and in terms of large-scale production (for example, BY Uralkali flows reach 1500 m3/h) they have a significant impact on the progress of the process does not have. Therefore, the full chemical analysis used statistical material. A known method of controlling the process of dissolution of the salt ore such as potash, by stabilizing the flow of the original solution and controlling the feed of ore depending on the content of useful component in the input flow and temperature measurement of a ready solution - see A.S. USSR №1256776, CL B01F 1/00; G05D 27/00. Publ. 15.09.86. Bull. No. 34. The proposed method additionally measure the mineral content in the finished solution, and depending on the temperature of the prepared solution and the contents of the received component, it determines the content of sodium chloride in the finished solution. The content of useful component in source and finished solutions and the calculated value of the content of sodium chloride to determine the ratio of the water content in the initial and final solutions and regulate the flow of ore in dependence shown in A.S. The method also differs poor accuracy, because the definition of the content of sodium chloride in the finished solution is determined by the method of calculation depending on the temperature and the content of the chloride is Aliya. The calculation assumes that the degree of saturation of the prepared solution of sodium chloride equal to 1. However, operating experience potash production shows that in the finished solution is always an excessive amount of solid sodium chloride, the presence of which in solution is determined by the removal of particles of halite ore in the clarification process, the evaporation of water from the surface of the thickeners at a temperature of clarification and crystallization of sodium chloride by cooling and evaporation of the solution. Therefore, the proposed method requires further definition of NaCl in the finished solution. In addition, stabilization of the flow rate of the starting solution is the need to install a buffer tank of large volume to smooth changes in the flow of working solution at the expense of unloading clay-saline sludge and concentrate, leaching equipment. A known method of controlling the process of dissolution of sylvinite ores, including the regulation of feeding ore depending on the content of useful component in the input streams, the temperature measurement of the prepared solution, density, temperature and flow solvent solution, the calculation of the ore feed, and the calculated value of the calculation serves as the task management system weighing feeder - prototype - see "process control Method of dissolution of sylvinite ores is, application RU # 2007114473 (015710) from 17.04.2007, publ. Bull. No. 31, 2008 There is a method allows to manage the dissolution process by means of automatic control. However, the applied devices have errors in process measurements, which always lead to the violation of technological regime. In addition, the known method does not take into account possible changes in the composition of the liquor due to the presence of magnesium chloride in sylvinite ore. The task of the invention is to improve the accuracy of the control process of dissolution of sylvinite ores by adjusting the main stream of ore, depending on the composition of this solution, i.e. the input of the feedback control system weight batcher. This object is achieved in that in contrast to the known method further measure the content of potassium chloride in the finished solution after clarification and flow, according to the received data and the temperature to calculate the ore feed to adjust its primary thread according to the following dependence, and the calculated values serves as the task management system weight batcher:
where ±ΔGore- the charge of ore, corrective its main thread, t, the sign ± indicates the need to increase or decrease the Oia main flow of sylvinite ore; Ggtr-Rthe flow rate of the clarified solution, t;
where t is the temperature of the clarified solution, °C;
To control the process of dissolution of sylvinite ore by introducing into the control system weighing feeder feedback process parameters, in addition to content in the solution of MgCl2are determined with the aid of instruments quickly, and the content in the solution of MgCl2- analytically. However, this figure is enough to determine 1 in every 12 - 24 hours, as it varies little due to the large volume of circulating liquor and minor changes in the concentration of MgCl2in sylvinite ore arriving at the dissolution. As a rule, the content of MgCl2in the solution ranges from 0-14 t/1000 t N2O. The essence of the method as a technical solution consists in the following. The proposed method of managing the process of dissolution of sylvinite ores includes reg the regulation of the supply of ore, depending on the content of useful component in the input streams, temperature measurement of the prepared solution, density, temperature and flow solvent solution, the calculation of the ore feed. In contrast to the known method the proposed method additionally measure the content of potassium chloride in the finished solution after purification coming from solvents sylvinite ore, and its consumption. This solution should have the degree of saturation on potassium chloride αKCl=0,97±0,01 at a temperature of clarification of this solution. As the experience of potash enterprises, increasing the degree of saturation of the solution more than 0.98 in the halite blade increases the content of insoluble Silvina - natural potassium chloride, especially in fractions of ore over 5 mm, the share of which in the ore reaches 15%. When αKClless than 0.96 reduced capacity solution of chloride of potassium, which leads to lower output kristalliset with 1 m3the clarified solution in the cooling installations vacuum crystallization and increase the flow of working solution arriving at the dissolution, and hence higher energy consumption for circulation and heating. The known method allows you to manage the process of dissolution of sylvinite ore by changing the flow rate depending on the flow rate and solvent composition of the solution with respect to temperature. However, existing controls, and UE is Alenia have the error in the measurement of process parameters, which leads to the need to adjust the flow of ore. The proposed method allows you to enter the adjustment of the main flow of the ore, i.e. typing feedback in the control system weighing feeder depending on the content in the finished clarified solution of potassium chloride and the solution temperature according to the following dependence:
where ±ΔGore- the charge of ore, corrective its main thread, t, the sign ± indicates a need to increase or decrease the main flow of sylvinite ore arriving at the dissolution; Ggtr-Rthe flow rate of the clarified solution, t;
The 0.98 can be increased to 0.99 in the case of highly efficient equipment for grinding ore, resulting in sharply reduced content in ore faction +5 mm From the experimental data, see table 1. From the above data, averaging amendments for the coefficients in front of CKCland for a free member in the equations for the content in solution Similarly for Substituting these values amendments in the equation for temperature 97°C and The degree of saturation of the solution of KCl:
where t is the solution temperature, °C;
CKCl- concentration of KCl in solution, %. In the empirical equation, the dimension of the included parameters such as °C, and others, is balanced by a corresponding dimension of the coefficients, standing between the relevant parameters. The dependences allow you to adjust the flow equation the main stream of ore, carried out not only on the prototype, but also in any other way. Thus, identifying the additional content of potassium chloride in the finished solution after clarification and its consumption and relying on the floor is i.i.d. data and the temperature of the ore feed to adjust its main thread, solves the problem of increasing the accuracy of the control process of dissolution of sylvinite ores by adjusting the main stream of ore arriving at the dissolution. Therefore, implementation of the proposed method will allow you to enter feedback in the control system weighing feeder ore, which operates on existing potash companies.
The method is as follows. Ready solution obtained in the solvent system of sylvinite ore, is fed to the clarification in the thickeners, and then clarified ready solution is fed to the installation of the vacuum crystallization, which cools emitting in the solid phase crystalline potassium chloride. Determine the flow rate of the clarified solution, for example, by the induction flow meter type SORA HEH, temperature with thermocouple with unified output signal, for example, TSMU-055. Mass fraction of potassium in the ore and the clarified solution is determined by measuring potassium, for example, the company "Berthold LB 377-62. The density of the clarified solution is required to recalculate its volumetric flow rate in weight, using the primary Converter MFS 2000 and signal Converter MFS 081. The received signals are sent to the controller and the PC, where the signal goes to tape automatic dotato the main flow of ore to adjust the flow rate according to the above mentioned dependencies, which belt speed controls the flow of ore in the auto mode. Examples of the method Example 1 Readings:
αKCl=[0,0589+0,0004825·(97-96)+0,00007143·6]× ×20,02-0,2475+0,006733·6+0,003275-(97-96)=0,99
Therefore, the flow rate of the main flow of ore must be reduced by 13.6 tons per hour. Example 2. In example 1, the flow rate of this solution is given in t/h In the case of measuring the flow of a ready solution to the readings in m3/h mass flow rate is determined by the equation:
where Ggtr-R- mass flow rate, t/h On the instrument readings to determine the volume flow solution Ggtr-R=1526,1·1,245=1900 t/h Thus, by measuring the density and volumetric flow rate of this solution with the help of instrument control, for example, mass flow meter, determine the mass flow rate of the solution. The process control method of dissolution of sylvinite ores, including the regulation of feeding ore depending on the content of useful component in the input streams, the temperature measurement of the prepared solution, density, temperature and expenses is as a solvent solution, the calculation of the ore feed, characterized in that it further measure the content of potassium chloride in the finished solution after clarification and flow, according to the received data and the temperature to calculate the ore feed to adjust its primary thread according to the following dependence and calculated values serves as the task management system weight batcher:
|
