SU945151A1 - Process for producing potassium fertilizers - Google Patents

Description

(5) METHOD FOR PREPARING POTASSIUM DIAGNOSIS

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This invention relates to a technology for producing potash fertilizers from potash ores.

A known method for producing potash fertilizers is that after grinding and desliming ore, thickening and drying clay-salt slurry, the latter is mixed with the KC1 dust-like fractions obtained during drying of the flotation concentrate and granulated.

The disadvantage of the known method of producing potash fertilizers is that the macro- and microelements contained in the clay-salt slurry (Mn, Ba, Sr, Rb, V, Cu, B, Cs, Sm, CG) are water-insoluble, which makes them inaccessible for the assimilation of agricultural crops, and, therefore, does not contribute to increasing the yield of the latter,

The aim of the invention is to improve the agrochemical properties of potash fertilizers prepared on the basis of clay-salt slurry and potassium chloride.

This goal is achieved by the fact that after grinding and desliming ore, thickening clay-salt sludge, the latter is treated with hydrochloric acid, and then dried,

10 are mixed with the KC1 dust fractions obtained by drying the flotogon of the center and granulated.

The known method includes the following stages: source ore, grinding, desliming, thickening the sludge, drying the sludge, mixing with KC1, granulation, Q% potassium mixed salt.

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The proposed method includes the following stages: initial ore, grinding, desliming, thickening of the sludge, treatment of the sludge with acid. drying the sludge, mixing with KC1, granu l chi, kQ% -Han potassium mixed salt. The proposed method for the preparation of potash fertilizers differs from that known by introducing an additional operation for treating clay-salt slurry with hydrochloric acid. The optimal consumption of 30% HC1 0.150-0,200 kg per 1 kg of sludge. A further increase in the acid consumption does not increase the amount of water-soluble salts from the clay-salt schlem, as can be seen from the table. 1. Treatment of the sludge with an acid allows to transfer part of the water-insoluble trace elements into a water-soluble form and, in addition, increases the utilization rate of potassium from the convenient treatment of the sludge into a water-soluble form,: MP 92, MD 95, Ca 96, Cu 52, Fe S B 20, V 18, TG 22.

Prepared according to the proposed method, potash fertilizers are tested on a number of agricultural enterprises.

cultures. The test results are shown in Table. 2 and 3.

Table 2 Rheni. The fertilizers obtained by the proposed method have a more effective effect on the yield of agricultural crops. Example. Salt slurry in an amount of t kg, containing macro- and microelements,%: Mp 0.1; Md 1.0; Ca 1.0; Si 0.005; Fe 1.0; . B 0, 0.018; Ti 0.1 in water-soluble form, treated with hydrochloric acid in an amount of 200 g. After treatment with hydrochloric acid, clay-salt sludge is dried at a residual moisture content not higher than 1.0% and mixed with powdered potassium chloride in a ratio of 1: 1.7 to obtain the potassium salt. The resulting fertilizer contains. a number of food elements in water-soluble form (Table 1). Table 1

Alfalfa 1 year of life

KC1 h-. Unprocessed

Claims (2)

The claims of the g / vessel. seen from the table. 2, crop increase As a crop when using potash fertilizers based on clay-salt sludge treated with hydrochloric acid, it makes up 10-20% for alfalfa and 7-8% for barley (grain). The potassium utilization rate by plants from fertilizers based on sludges treated with acid is 1.7-1.8% higher than from fertilizers containing untreated clay-saline sludge (Table C). An increase in the coefficient of potassium utilization from fertilizer is of great practical importance, since it allows one to reduce the amount of fertilizer applied to the soil per unit of agricultural output. ♦ 5 A method of producing potash fertilizers ₍ by grinding and desliming the ore, thickening and drying clay-sludge, mixing with the dust-like fraction of potassium chloride and granulation, characterized in that, in order to improve the agrochemical properties of the fertilizer, clay-salt sludge is treated with hydrochloric acid before mixing in the amount of 0.15-0.20 kg / kg of sludge. SO