SU1490083A1 - Method of conditioning water-soluble salts - Google Patents

Abstract

The invention relates to the technology of obtaining non-caking water-soluble salts, for example potassium and sodium chlorides, by treating them with conditioning additives and reduces the consumption of alkali metal ferrocyanide while maintaining its anti-caking effect. According to the proposed method, conditioning of water soluble salts containing alkali earth metal soluble salt impurities is carried out by treating them with an alkali metal ferrocyanide solution and sodium hydroxide solution, which is equimolar with respect to alkali earth metal salts. The sodium hydroxide solution additionally contains sodium silicate and sodium aluminate in the following ratios of components, wt.%: Sodium silicate 0.5-2.0

sodium aluminate 0.02 - 0.10

caustic soda - the rest. 2 tab.

Description

The invention relates to a technology for the preparation of non-alkaline water-soluble salts, for example potassium and sodium chlorides, by treating them with condi-tion of ionized additives.

The aim of the invention is to reduce the consumption of alkali metal ferro1C1 anide while maintaining its anti-caking effect.

The proposed method carried out laboratory experiments. Fine-grained Llotoconcentrate was used, containing 0.11% magnesium chloride (the presence of 0.10% water-insoluble sulfate Kalysh does not affect the conditioning of the product). Potassium chloride grade X4, which does not contain alkaline-earth metal chloride impurities, was used in p-om-iTOB.

Ferroananide potassium and caustic soda were used as a conditioning additive by ourselves (prototype) and with the addition of sodium silicate and sodium aluminate,

Table 1 shows the results of experiments.

Table 2 shows the data on sodium ferrocyanide with the elimination of caking of sodium chloride, containing 0.15% of magnesium chloride.

In the absence of magnesium chlorides (experiments 1-3), a high anti-caking effect is achieved when using potassium ferrodianide alone, and 20-40 g / ton of potassium chloride is sufficient. For a product containing 0.11 wt.% Magnesium chloride increased 4

WITH

00

with

The consumption of ferrocyanide up to 200 g / t does not lead to the formation of a crumbly product (experiments 4-5). Adding caustic soda in a stoichiometric amount relative to magnesium chloride results in a crumbly product at high consumption of ferrocyanide - 100–200 g / t (experiments 7 and 8). An increase in the consumption of caustic soda over equimolar does not lead to positive results, there is even some deterioration in the results, which is explained by the suppression of the effectiveness of the amine in process (70 g / t) after flotation, where the amine is used as a collector (experiment 9) .

When using caustic soda with the addition of silicate and sodium aluminate, effective binding of magnesium chloride occurs and the action of ferrocyanide is activated (experiments 10-12, 15-17). A decrease in the content of sodium silicate (test 13) and sodium aluminate (test 18) leads to a decrease in the anti-caking effect of ferrocyanide. Increase in content in condition 1: an additive of sodium silicate (test 14) and sodium aluminate

(experiment 19) does not increase

anti-caking action.

Example. Potassium fertilizer

(flotation concentrate or crystallized) after dehydration or drying

20–40 May 7 are used. With a solution of caustic soda in an amount equimolar to the content of potassium fertilizer water-soluble salts of magnesium and calcium with the addition of silicate and sodium aluminate in the amount of 0.5-2.0 and 0.02-0.1% of content in caustic soda solution, respectively. Then the product is treated with 5-10 wt.% Solution of potassium ferrocyanide or sodium at a rate of 20-40 g / t.

Claims (1)

Invention Formula The method of conditioning water-soluble salts, containing impurities of water-soluble alkaline-earth metal salts, by treating with a solution of caustic soda, in an amount equimolar with respect to alkaline-earth metal salts, and an alkali metal ferrocyanide solution, is different that, in order to reduce the consumption of alkali metal ferrocyanide while maintaining its anti-caking action, the caustic soda solution additionally contains sodium silicate and sodium aluminate at the following ratios onents, wt.%: Sodium silicate 0.5-2.0 Sodium aluminate 0.02-0.10 caustic soda IT a b l and c a I 61.2 90.7 91.1 A9.5 65.2 72.5 83.8 89.5 80.1 88.5 90.1 91.2 Continuation of table 1