SU1604811A1 - Method of producing potassium chloride - Google Patents

Abstract

The invention relates to the technology for the recovery of potassium chloride from sylvinite ores by flotation and improves the recovery of potassium chloride and the content of the useful component in the final product used as fertilizer. The method includes grinding potash ore, conditioning the suspension with a reagent (a depressor and a collector), subsequent main flotation with separation of the main flotation froth product containing NACL in the solid phase 10-30 wt.%, Its treatment with dimethylformide at a rate of 5-15% g / t solid, flotation cleaning of the obtained concentrate, dehydration and drying of the finished product. 1 tab.

Description

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This invention relates to chemical technology of inorganic substances; namely, the technique of obtaining potassium chloride from potash ores by the flotation method, and is aimed at improving the quality (content of the useful component) of fertilizers.

The purpose of the invention is to increase the content of potassium chloride in the concentrate and the degree of its extraction in the finished product.

Potash ores, along with the useful component sylvin (potassium chloride), contain at least 60% halite (sodium chloride), which significantly affects the efficiency of the release of potassium chloride from the original ore.

The method of producing potassium chloride is carried out by grinding potash ore, treating it with flotation reagents, basic flotation of potassium chloride, flotation cleaning of concentrate, leaching, dewatering and drying the finished product. The concentrate (suspension of froth product of the main flotation), containing 10-30 wt.% Sodium chloride in the solid phase, is treated with dimethylformamide (DMF) at a flow rate of 5-15 g / t solids. This technique allows to increase the sorption of DMF on potassium chloride and reduce its sorption on sodium chloride. Moreover, DMF is introduced into the suspension in pure form, and not as an additive in a hydrochloric acid solution of the amine. Such treatment of the suspension improves the quality of the finished product and the recovery of the KCI.

Example. Chavez ore containing 27.5 wt.% KCI and 2.5 wt.% Insoluble residue, crushed in a mill to a particle size of 0.8 mm, is treated sequentially with a modifier of sludge, reagent-collecting Os

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telem with reagent-frother. The sludge modifier is a 2% aqueous solution of carboxymethylcellulose sodium salt (NaKMC). Consumption of NaKMTS-400 g / t of ore. The contacting time is 2 min., The collector is used — the CuCAO compounds are distilled in the form of a 1% hydrochloric acid solution. Contact time 30 s. Consumption collector 65-70 g / t of ore.

The content of NaCI in the solid phase of the suspension after separation of halite is 9.98%. Flotation is carried out for 4 minutes in a fluidized bed flotation machine. Camera capacity 0.5 liters. The suspension obtained after the main flotation with a certain NaCI content (10–30 wt.%) Is treated with DMF at a flow rate of 5–15 g / t of solid and fed to a stream flotation,

The froth product (concentrate) and the chamber product (tails) are separated from the saturated brine solution on a Buchner funnel. Dehydrated products are dried, weighed, crushed to a particle size of 0.25 mm and subjected to chemical analysis. The content of KCI in the flotation products is determined according to GOST. The effect of the sodium content in the solid phase of the suspension and the amount of DMF introduced on the processing of the suspension on the degree of extraction of potassium chloride and its content in the concentrate are presented in the table.

From the results shown in the table, it can be seen that the optimal consumption of DMF for the processing of the concentrate after the preliminary extraction of halite is 5–15 g / t of solid, since at a flow rate below 5 g / t

the quality of the concentrate is insignificant, and at a flow rate above 15 g / t there is no improvement in the quality of the concentrate,

When the content of sodium chloride in the suspension is more than 30%, there is no effect of improving the quality of the concentrate in the roughing operation. When the content of sodium chloride in the suspension is less than 10%, high losses of potassium chloride are observed, which are not compensated for by an increase in the quality of the concentrate from DMF treatment. When the content of sodium chloride is 10-30%, an increase in quality is observed without a decrease in the yield of the finished product.

Thus, the proposed method allows improving the quality of roughing operations, increasing the recovery rate of KCI in the finished product and improving the quality of the finished product.

Claims (1)

The method of obtaining potassium chloride from potassium ores containing sodium chloride, including grinding ore and processing it with modifying and collecting reagents, basic potassium chloride flotation with concentrate, flotation cleaning of the concentrate, dehydration, drying of the finished product, with , in order to increase the content of potassium chloride in the concentrate and the degree of its extraction in the finished product, the concentrate with the content of sodium chloride in the solid phase 10-30 wt.% is processed demethyl form idom at a rate of 5-15 g / t of solid. Table continuation