SU1680681A1 - A method of obtaining potassium fertilizers from potassium-containing ores - Google Patents

Abstract

The invention relates to the enrichment of minerals by the flotation process and can be used to obtain potash fertilizers from potassium-containing ores. The aim of the invention is to increase the recovery rate of potassium chloride while reducing reagent consumption and improving the quality of the concentrate. The method of obtaining potash fertilizers includes grinding, desliming ore with its classification into fine and coarse fractions, processing the coarse fraction with a depressor and collector and flotation of potassium chloride from the coarse fraction, feeding into the resulting chamber product, selected from the fine fraction of the class - 0.2 + 0 1 - + 0.074 mm together with a class enriched in potassium chloride - 0.1 - 0.074 + 0 mm, and the sludge fraction extracted from it - 0.045 + 0 mm is removed from the flotation process. The resulting concentrate contains 95.1% CS and the recovery of potassium chloride in this case is 97.5%. 1 il. 2 tab.

Description

The invention relates to the enrichment of minerals by the flotation process and can be used to obtain potash fertilizers from potassium-containing ores.

The purpose of the invention is to increase the recovery rate of potassium chloride while reducing the consumption of reagents and improving the quality of the concentrate. .

The drawing shows a scheme for implementing a method for producing potash fertilizers from potassium-containing ores.

. Ore after grinding and desilting is classified. A large fraction of -1.0 + 0.2 mm after treatment with a depressor and a collector is fed to potassium flotation. The fine fraction -0.2 + 0 mm is divided by size from 0.1 to 0.074 mm. The fraction -0.1 - 0.074 + 0 mm slimes out, for example, by the flotation method. The fraction -0.2 + 0.1 - +0.074 mm together with the de-precipitated fraction -0.1 - 0.074 + 0 mm are fed into the chamber product of potassium chloride flotation from the coarse fraction. The sludge fraction of -0.045 + 0 mm is removed from the enrichment process.

The granulometric and chemical composition of the pre-slime ore -. particle size -1,0 + 0 mm and its fractions -0,2 + 0 mm are presented in table. one.

Ore with a particle size of -1.0 + 0 mm, containing 28.7% KCI and 2.0% N.O. (insoluble residue) is represented by a 51% class - 1.0 + 0.2 mm. containing 26.3% KCI and 0.9% N.O. and 49% class -2.0 + 0 mm. containing 31.2% KCI and 3.2% N.O. Before conditioning with the collector of the fine fraction -2.0 + 0 mm for depression clay-Os 00

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Carbonate sludge from this fraction (3.2% IO) serves 300-400 g / t of CMC ore (carboxymethylcellulose) ore into the process. Analysis of the particle size distribution of the -2.0 + 0 mm fraction (Table 1) shows that it is represented more than 1/3 of the thin class –0.045 + 0 mm, the IO content. in which is 5.9% vs. 0.8% N.O. in the class -0.1 + 0.074 mm and 1.2% N.O. in the class -0.074 + 0.045 mm and 0.5% N.O. in the class of -0.2 + 0.1 mm, i.e. according to the contents of N.O. fractions -0.2 + 0.045 mm approximate the chemical composition of the fraction -1.0 + 0.2 mm.

In the process of desliming the fraction -0.1-0.074 + 0 mm, free thin slimes are removed from the pulp, i.e. structurally unrelated to KCI particles, coarseness — 0.045 + 0 mm, which have the most negative effect on the flotation of potassium chloride. Even tenth fractions of a percentage of clay-carbonate impurities contained in the ore significantly reduce the recovery of KCI in the concentrate and necessitate the introduction of several times more aliphatic amines into the process, thereby increasing the consumption of the CMC depressant, which suppresses the negative effect sludge. The removal of potassium chloride from the flotation process of the slurry fraction of -0.045 + 0 mm reduces the CMC consumption for sludge depression by 50-150 g / ton of ore.

It is the separation of the fine fraction — 0.2 + 0 mm in size from 0.1 to 0.074 mm (the classification limits are due to the chemical composition of the ore given in Table 1) and the additional desliming of the fraction -0.1-0.074 mm with output from the flotation process vysokoslamisty

fraction -0.045 + 0 mm ensures the achievement of the goal.

Technological indicators of sylvinite ore enrichment, containing 28.7% KCI and 2.0% N.O. on the proposed and known method, are shown in table 2.

According to the proposed method, a concentrate is obtained containing 95.1% KCI versus 94.5% KCI in a known process, the recovery of potassium chloride in this case is 97.5% against 96.8% in a known method. By increasing the recovery of potassium chloride in the concentrate, losses of potassium chloride with enrichment wastes are reduced, which are 2.5% in the proposed method versus 3.2% in the known. Due to the withdrawal of the thin slimey fraction from the enrichment process of -0.045 + 0 mm, the consumption of the CMC depressant reagent is reduced from 350 g / t of ore in the known method to 300 g / t of ore in the proposed.

Claims (1)

The invention of the method for producing potash fertilizers from potassium-containing ores, including grinding and desliming ore with its classification into fine and coarse fractions, processing a large fraction with a depressant and collector and flotation of potassium chloride, feeding the resulting fraction product of the fine fraction, characterized in that In order to increase the content of potassium chloride in the product while reducing the consumption of reagents, the class of -0.2 + 0.1 - +0.074 mm, separated from the fine fraction, is supplied to the chamber product together with the enriched in feces class -0; 1 - -0.74 + 0 mm, and the sludge fraction extracted from it -0.045 + 0 mm is removed from the process. Table 1 Table 2 Shredding h: | Dehumidification  Classification ma-hp coiition  Anina PNVIA F ftayii si8ina Shaatrat KC1 Classification -0.1 ± -0.07Ь + Onn -0, + HK- + 0.07iniH Dehumidification Shlan V otYa -0.045 + 0 pi y , Privateer product Flotation sylvina Hvesta 8 otval