Device for processing of sylvinite-carnallite raw materials

IPC classes for russian patent Device for processing of sylvinite-carnallite raw materials (RU 2369558):

C01D3/08 - Preparation by working up natural or industrial salt mixtures or siliceous minerals

Another patents in same IPC classes:

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

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Method of producing brine for electrolysis / 2347746

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Method for processing salt rejects of magnesium production / 2316604

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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

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The method of obtaining salt from produced water of an oil field / 2211802

The method of obtaining potassium fertilizers / 2196759

The invention relates to the field of production of potash fertilizers from sylvinite ores by flotation method

Potassium chloride and sodium chloride production process / 2307790

Method of separation of potassium chloride / 2315713

Method for processing salt rejects of magnesium production / 2316604

Method of producing brine for electrolysis / 2347746

Method of controlling process of sylvinite ore dissolution / 2352385

Potassium chloride obtaining method from sylvinite ore / 2366607

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.

Method to control silvinite ore dissolution / 2398620

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: where ±ΔG_ore is ore consumption that corrects its main flow, t, symbol ± indicates a necessity to increase or decrease primary consumption of silvinite ore consumption; G_{read sol} is consumption of clarified solution, t; C_{KCIread sol} is content of potassium chloride in clarified solution, %; C_KCIore is content of potassium chloride in silvinite ore, %; α_{KCIread sol} is saturation of clarified solution with respect to potassium chloride.

Method to control carnallite ore dissolution / 2404845

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 G_ore is the consumption of carnallite ore, t; G_sol 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, %.

Method of controlling process of dissolving potassium chloride / 2409415

Invention can be used in halurgic production. The method of controlling the process of dissolving potassium chloride involves controlling supply of ore depending on content of the useful component in input streams, measuring temperature of the ready solution and consumption of dissolving solution. The ore used is an electrolyte obtained during electrolysis of molten dehydrated synthetic carnallite having the following composition: KCl - 60-80 %, MgCl₂ + CaCl₂ - 7-9%, insoluble particles - up to 1 %, NaCl - the rest. Content of magnesium chloride in the ready solution, its consumption, content of potassium chloride in the halite wastes and its consumption are also measured. The obtained parametres are used to determine maximum content of potassium chloride in the ready solution. The optimum consumption of electrolyte is calculated and the calculated value is used as a setting in the electrolyte consumption control system: where G is consumption of electrolyte, t; G_{r sol}.is consumption of the ready solution, t; G_{d sol}.is consumption of the dissolving solution, t; G_w is consumption of the halite wastes,t; C_KCle is content of potassium chloride in the electrolyte, %; C_{KCl r sol} is maximum content of potassium chloride in the ready solution, %; C_{KCl d sol} is content of potassium chloride in the dissolving solution, %; C_KClw is content of potassium chloride in the halite wastes, %.

FIELD: mining.

SUBSTANCE: 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.

EFFECT: higher completeness of raw materials use, yield and purity of finished products, simplified design, reduced moisture content in products and power outputs.

2 cl, 2 dwg

The invention relates to the processing of sylvinite and carnallite and can be used for potash and other mining and chemical enterprises.

A method of obtaining potassium chloride, in which the wet concentrate, potassium chloride is dissolved in the reactor leaching solution at a temperature of 95-105°C., then a solution brighten skin from impurities in the clarifier and cooled in an installation adjustable vacuum crystallization to a temperature of 30-45°C, emit crystallized, dried in the dryer drum, to the mother solution, water is added, heated and used as a leach solution (see p. the Russian Federation No. 2196734, MKI C01D 3/04, 20.01.2003).

The disadvantages of the known patent are low quality product because there is an accumulation of boron compounds and formed agglomerates consisting of bromide, chloride of potassium, as well as high energy and material costs due to the complexity of the design of the device, the presence of a large number of rotating elements.

A device for processing Silvinit-carnallite raw materials, including installed downstream clarifier liquor, augers, drying and containing at least two interconnected devices dissolution, Pechkovsky CENTURIES and other Technology potash fertilizers, Minsk, Vysheishaya school, 1978, SS, 175-186, 198-219. This unit is taken as a prototype.

The disadvantages of the known system are the complexity of the hardware design due to the necessity of a special vacuum equipment, the need for large production areas that will not allow you to avoid high energy and material costs required for equipment for the heating of the solution and evaporation of edible salt, capital expenditures for the cleaning of the brine. Other disadvantages include lack of purity of the finished product due to its high calcium content.

The present invention is directed to a device of a vertical type processing Silvinit-carnallite raw materials, allowing the use of non-waste technology and ensure better use of raw materials, increasing the yield and purity of target products at low energy costs, improving the efficiency and environmental friendliness of the process.

The technical result consists in the reduction of material costs by simplifying the design, the exclusion of rotating elements, increase endurance, improve product quality by reducing the moisture content, the reduction of energy consumption at all stages of the finished product.

This technical result is achieved in that the device for processing Silvinit-carnallite raw materials includes the t is placed on the flow measuring hopper, tank-mixing, the illuminator liquor, augers, mixers, two dissolution apparatus arranged vertically along the flow for each other and interconnected by means of a transport screw, the second device through the auger dehydration, mounted at an angle not less than 15°, is connected to the dryer inside each unit of dissolution coaxially thread posted a column for processing the mixture with installed striped nourishing and grounding electrodes, the number of electrodes depends on the flow of the mixture, and the walls and columns of the device form the annulus to output the liquor.

Figure 1 shows a diagram of a device for processing Silvinit-carnallite raw materials (option 1). Figure 2 shows a diagram of the device for processing Silvinit-carnallite raw materials (option 2).

The device (1) includes hosted by the flow measuring hopper 1, the liquor clarifier 2, tank mixing 3, the dissolution apparatus 4, 5 arranged vertically on the stream one after another, within each apparatus 4, 5 dissolution coaxially thread posted a column for processing a mixture of 6 with alternating nutrient 7 and the grounding electrodes 8, columns dissolving 4 and 5 are interconnected by a transport screw 11, in the lower part of the columns dissolving 4 and 5 and tank mixing 3 are agitators with engines-gearboxes 9, the walls of the apparatus of the races is of its 4 or 5 and columns 6 processing the mixture to form annulus 10 to output the liquor, auger dehydration 12, mounted at an angle of more than 15°, on the one hand is connected with the second dissolution apparatus 5, and on the other the dryer.

The device (2) according to the second variant includes hosted by the flow measuring hopper 1, the liquor clarifier 2, tank mixing 3, the dissolution apparatus 4, 5 arranged vertically on the stream one after another with columns dissolving 6 contain placed parallel to and communicated between the two columns 13 and 14 conclusion liquor, in units 4 and 5 are alternate grounding 8 and nutritious electrodes 7, the dissolution apparatus 4 and 5 are interconnected by a transport screw 11, the screw dewatering 12, mounted at an angle of more than 15°, on the one hand is connected with the second apparatus dissolve 5, and on the other the dryer.

The device operates as follows.

Option 1.

Sylvinite ore containing more than 70 wt.% crystalline sodium chloride and about 30 wt.% impurities, including, 26.5 wt.% potassium chloride, the rest is insoluble residue and other salts, crushed to a fraction of 1 mm, and fed into the measuring hopper 1. Prepare rich liquor in the clarifier 2. The crushed ore under normal conditions (T=25°C and p=0.1 MPa) is dissolved in the previously prepared in the clarifier 2 circulating liquor is saturated in sodium chloride containing 12,04% (148,69 g/DM³) chloride is Aliya, in the ratio of ore:liquor =1:2 is supplied from the measuring hopper 1 into the tank mixing 3, intensively mixed with a stirrer. The resulting solution was fed to the leaching in the column processing 6 of the first dissolution apparatus 4, which is parallel to the thread posted by grounding electrodes 8 and the interelectrode space - nutritious plate electrodes 7. The number of electrodes depends on the solution flow rate. For example, at a flow rate of the mixture equal to 0.03 m/s, and the flow of the mixture G=0, 0012 m³/c in the column set two nutritious and three grounding electrode, an insulating nutrient electrodes from each other. The height of the electrodes 0.7 m, a width of 0.05 m On nutrient electrodes 7 connected to one pole of the current source serves voltage 30-50 Century, the Direction of the electric field in the column is changed with a frequency of 1 Hz. Thus, in the first column processing 6 create alternating electric field of low frequency. The processing solution in the first column 6 should be performed within 15 sec. by creating in solution induction currents its temperature is increased and amounted to more than 35°C. experiments have shown that with this arrangement of the electrodes, their number and the processing mode optimizes the output of the potassium chloride from the ore into solution. While sodium chloride is not soluble, because the solution is saturated by chlorine the control of sodium.

Ore is served from the first apparatus 4 dissolution through the transport screw 11 in the second stage of leaching in the column processing 6 second dissolution apparatus 5. Liquor from the annulus 10 of the first device 4 dissolution located between the inner wall of the device 4 and the wall of the column 6 processing is fed to the leaching of the second device 5 dissolution. The design of the second dissolution apparatus 5 is identical to the first dissolution apparatus 4, but its nutritional electrodes 7 are connected to opposite poles of the power source. Thus, two of the dissolution apparatus, electrically connected in series, and a constant current source form a closed electrical circuit. In the second apparatus 5 dissolving the mixture of the solution with the ore is again treated with the alternating electric field of low frequency in the same mode as in the first apparatus 4 dissolution. By connecting nutritious 7 electrodes of the first 4 and second 5 devices to the opposite poles of a current source and a synchronous change their polarity in the devices create the electric field of the opposite direction, i.e. the columns are out of phase with respect to each other. Thus electric currents of each of the columns have opposite directions and cancel each other. After processing in the column processing 6 vtoro what about the dissolution apparatus 5, the obtained solution, containing 21,79% potassium chloride (271,29 g/DM³), whose temperature is 39-40°C.

The content of potassium chloride in the original liquor, ore and in the circulating liquor after dissolution was determined perchlorate method.

After processing in the second device 5 lye potassium chloride is separated from the solid phase by filtration on a vacuum filter (not shown). The residue after filtration, containing more than 98% sodium chloride, purified from the insoluble residue, and other salts and direct the production of technical and salt. Lye potassium chloride after filtration sent to crystallization by cooling it to room temperature. The obtained crystals contain more than 98% of potassium chloride and represent the finished product. The circulating liquor after crystallization of potassium chloride are sent to the stage of dissolution of sylvinite ore.

During the process of dissolution of the ore by leaching in two stages in the dissolution apparatus without displaying liquor after the first stage, he was enriched on 36,78 g of 39,75 g maximum possible, which indicates a high degree of extraction of the target product.

Option 2. The operation of the device for processing Silvinit-carnallite raw material is identical to the version 1. When leaching the ore after the first dissolution apparatus 4 includes a striped ground 8 and the feeder is s 7 electrodes, liquor is fed to the column 13 to output the liquor from which it is fed to the leaching of the second apparatus 5 dissolution. Halite waste after the second device has a 5-dissolution is fed to the dehydration of the scroll dehydration 12, which is located at an angle not less than 15°, providing a minimum moisture content, and then drying. With a smaller angle of inclination of the auger moisture content will exceed 8-10%, an increase of the energy consumption for drying of the product. Supersaturated liquor from the first column 13 conclusion liquor to the apparatus 5 of dissolution, where it is removed in column 14 conclusion liquor, and then liquor is fed to the clarifier 2 and crystallization. After crystallization depleted liquor is fed to the dissolution of the ore and the process repeats.

Thus, the proposed device allows to obtain in a closed loop for circulating the liquor high chloride having a purity of more than 98%.

The proposed device has the following advantages:

simplicity and efficiency by eliminating energy-intensive and high-cost equipment for stage evaporation in the production of sodium chloride, stages of heating and cooling liquor and washing the clay slurry with hot water in the production of potassium chloride:

environmental safety, since it is a closed loop, using the receiving of the circulating liquor,

- does not harm the health of the staff, because excluded harmful fumes, and does not use toxic and harmful chemicals.

- contributes to the reduction of production space by eliminating cumbersome and costly evaporation plants and heat exchangers and the use of compact and simple in design and operation columns of dissolution.

1. Device for processing Silvinit-carnallite raw materials, including installed downstream clarifier liquor, two interconnected dissolution apparatus, augers, dryer, characterized in that the dissolution apparatus are located vertically along the stream one after another and interconnected transport auger, the last of the machines connected to the dryer through installed at an angle not less than 15° screw dehydration, within each of dissolution apparatus coaxially thread posted a column for processing the mixture with established in the alternating nourishing and grounding electrodes and casing walls for processing mixtures and apparatus of dissolution form the annulus to output the liquor.

2. The device according to claim 1, characterized in that parallel to each apparatus dissolution posted by colon for withdrawal of liquor.