SU1527230A1 - Method of producing potassium chloride - Google Patents

Abstract

The invention relates to a technology for processing potash ores containing clay slimes, and can be used to produce potash fertilizers. The purpose of the invention is to increase the yield of the product from the ore and the speed of processing waste production. The method is carried out by treating flocculent fine fraction of crushed ore with a particle size of 0.25 mm prior to hydrochemical desliming, after which the sludges are thickened and floated, with discharged fine clay sludge released into the froth product. The sludge obtained by hydromechanical desliming, mixed and thickened with the fine fraction, and then further mixed and dehydrated with a large fraction of halite waste. The sludge obtained by hydromechanical desliming, is also mixed with a fine fraction of halite waste, thicken, dehydrate, subjected to hydrothermal processing and receive from them crystalline potassium chloride. The application of the invention at the processing plants will reduce the loss of KCL to 1% and reduce the amount of thickeners in the processing of 10 million tons / year of potash ore from 17 to 11, which will reduce the specific operating costs for thickening sludge.

Description

The invention relates to the technology of processing potash ores containing clay slimes, and can be used to obtain potash fertilizers.

The purpose of the invention is to increase the output of potassium chloride from potash ore and increase the specific productivity in the processing of production wastes.

PRI me R. Sylvinite ore is crushed to 1 mm FI classified

in a hydrocyclone. Suspension of a hydrocyclone discharge at a liquid: solid phase ratio (W: T) equal to 15-20, with a large amount of ore particles less than 0.25 mm

treated with a solution of flocta nta - polyacrylamide (PAA) with consumption

 10 g / t of ore and thicken in a settling tank with a specific capacity of 1.2–1.8 m / m h with a higher clarified uterine saline solution. Condensed fine fraction of ore is floated at W: T 3-4. In this penny

the flotation machine product extracts the folded clay pshamy. The foamy product is sent for thickening and clarification to the accumulation basin (sludge store), and the flotation machine product is sent for hydromechanical desalinating to the hydro separator followed by flotation, and the sweetener is applied; flotation machines. Drainage of the hydroseparator together with the foamy products of the flotation machine of the flotation desliming is concentrated and sent for clarification to the accumulation basin. At the same time, the volume of discharge of the hydroseparator, which is directed towards thickening, is reduced by 3.5–4.0 times as compared with the known method due to the separation of the clarified mother liquor from the discharge of the hydrocyclone during the primary accumulation.

To accelerate the condensation drain of the hydroseparator, it is mixed with a fraction of halite waste less than 0.25 mm, obtained from their classification and in hydrocyclones, and then dehydrated together with hydrocyclone sands. This reduces the loss of the useful component with the liquid phase of the sludge, since the moisture content of the halite waste and sludge is 12-13%, and the dehydrated sludge decreases to 30%. In this case, the volume of liquid sludge sent to the sludge storage is reduced 2.5 times.

For more complete extraction of potassium chloride from sludge and fine fractions of halite waste with a particle size of less than 0.1 mm, containing up to 10% KC1, halite waste is classified in a hydro cyclone. At the same time, 8–10% of enriched fine fractions are released into the drain. These fractions are mixed with a hydroseparator drain, dried, dehydrated and sent to hydrothermal processing.

The fine fractions are dissolved at 56-58 ° C, the heated suspension is clarified, and crystalline potassium chloride is isolated by cooling the suspension in a vacuum crystallization unit to 25-30 ° D.

In case of joint condensation of the hydroseparator and the methane fraction of halite waste and their dehydration together with the Kpyinmii fraction of halite waste (peskl 1i and ri-schrocyclones)

Q 5 0

5 o

d 5

Q

five

the volume of liquid sludge sent to the sludge storage is reduced by 1.82 times, and the recovery of KC1 from ore to concentrate increases from 85.47 to 86.75% with a moisture content of halite waste of 10%.

The recovery of KC1 in the concentrate remains at the same level when the humidity of the halitoflame waste is less than 13.0%.

When classifying halite wastes in a hydrocyclone according to the class O, I mm, out of 63.85 kg of waste containing 2.4% of KC1, 6.6 kg of fine fractions containing 10% of KC1 and 59.25 kg of sand are obtained in the discharge of the hydrocyclone. containing 1.55% KC1.

Of 4.39 kg of clay slurries containing 11% KC1, 1.79 kg are foamy products of flotation sludge containing 7.2% of KC1, and 2.6 kg are solid phase in the discharge of a hydro separator containing 3,627, KC1 and 52 , 6% insoluble residue (n. O.),

Poi displacement of 6.6 kg of fine fractions of halite wastes containing 10% KC1, and 2.6 kg of a hydroseparator discharge containing 13.62% KCl, 9.2 kg of a thin product containing 11% KC1 are obtained. This product is subjected to hydrothermal processing: concentrated, dehydrated to a moisture content of 20-25% and mixed with saline solution heated to. At this temperature, the solid phase KC1 goes into a solution containing 15.4 KC1, 18.7% NaCl and 65.9% n. The heated suspension is dewatered in a settling centrifuge to a sediment moisture content of 20-25%, and the clarified brine is sent to a vacuum crystallization unit, where 0.55 kg of KC1 crystal is contained, containing 97.5% KC1, which is 2%. , 0% of the original ore.

Using the method will reduce the losses of KS1 to 1% and reduce the number of thickeners during the processing of 10 million tons of ore per year from 17 to P, which will reduce the specific operating costs for thickening sludge.

Claims (1)

Invention Formula The method of obtaining potassium chloride from potash ore, including it from 15272306 grinding, classification, hydromechanical desliming and flotation, underwater and flotation sludge and sludges obtained during hydromechanization, enrichment, thickening and combustibility of small-scale waste, distinguished fractions of crushed ore, mixed and that, with the aim of increasing with the fraction of halite waste, the yield of potassium chloride and it is 0.25 mm, thicken and dehydrate the specific productivity of processing or mix with the fraction of halite waste production waste, fine waste less than 0.1 mm, dehydrate First, the fraction of crushed ore is first subjected to a hydrothermal process, processed by flocculation, concentrated and processed, and crystallized is obtained by flotation, then potassium hydromechanical chloride is carried out.