RU2120915C1 - Process of converting potassium ores into potassium chloride by metallurgical method - Google Patents

Abstract

FIELD: chemical processing of sylvinite ores. SUBSTANCE: method comprises leaching potassium chloride from circulating hot solution, clearing saturation solution, cooling, separating potassium chloride crystals, heating circulating solution and recycling it for leaching. Prior to heating the circulating solution, sample is taken therefrom, analyzed for gold content, and as soon as gold is accumulated to concentration of 10-50 mg/sq.m, the circulating solution is fed into sorption column filled with highly basic anionite, more particularly anionite AB-17 in Cl form. The claimed process makes it possible to recover gold from circulating solutions by sorption on ion-exchange material. EFFECT: more efficient conversion process. 2 cl

Description

 The invention relates to halurgy and can be used in the processing of sylvinite ores by the chemical method.

In recent years, the geological service of Uralkali JSC in the sylvinite layers of the Verkhnekamsk potash deposit has established industrial gold concentrations ranging from 0.1-0.5 g / t. In this case, an increase in the concentration of gold with depth was revealed. Its maximum concentrations are confined to the 7th layer of the Red II layer. It has been experimentally proved that gravitational gold is about 10% of its total volume. Therefore, with the grinding of sylvinite to 4-5 mm and heating of the dissolving liquor to a temperature of 110-115 ^o C taking place in the technological scheme of the processing process, the gold concentration in the circulating solutions gradually reaches significant values. The gold content in the working solutions of the galurgic factory of the First Bereznikovsky ore management of JSC Uralkali reached 10-50 mg / m ³ .

 A known method of processing potassium ores into potassium chloride by the galurgic method, including leaching potassium chloride from ore with a hot hot solution, clarifying a hot saturated solution, cooling it, filtering crystals, drying, heating the working solution and returning it to leaching potassium chloride from ore, which is accepted as prototype [1].

 The disadvantage of this method is that it does not provide for the extraction of gold from working solutions.

 The purpose of the invention is the extraction of gold from circulating solutions by sorption it on ion-exchange material.

 This goal is achieved by the fact that after the accumulation of gold in working solutions, they are sent to a sorption column filled with anion exchange resin, selectively extracting this noble metal from chloride media.

 In existing sources of information such a method of processing potash ores is not found.

 The method is as follows. Leaching of potassium chloride from crushed sylvinite ore is carried out with a hot circulating solution. Then the hot saturated solution is clarified (separated from saline sludge and insoluble residue). Then carry out its cooling, accompanied by crystallization of potassium chloride, filtering the crystals and drying.

Next, before heating the mother liquor obtained after separation of the crystals of potassium chloride, a sample is taken from it and analyzed for gold content. When gold is accumulated in the circulating solution to a concentration of 10-50 mg / m ³ , it is sent before heating and return to leaching to the sorption column (adsorber). Sorption of gold from solutions with a concentration of less than 10 mg / m ^{3 is} economically inefficient. Concentration of gold ionite from solutions with a content of more than 50 mg / m ³ can lead to its loss due to a “leakage” during filtration through a resin layer.

 Before filtering the gold-containing solution, the adsorber is filled with a strongly basic anion exchange resin, for example, AB-17 in the Cl form. Other anionites similar in structure and physicochemical properties can be used for gold sorption: AM (Russia), Amberlight IRA-400 (USA), Dowex I (USA), FF zololite (England), AM-2B (Russia), etc. . [2].

 The processing of gold-saturated resin is carried out by known methods, for example, electroelution is carried out with the deposition of gold at the cathode [3].

The method is tested in laboratory conditions. The working solution obtained by processing potassium ores into potassium chloride by the galurgic method with a gold content of 20 mg / m ^{3 was} filtered through a sorption column loaded with AB-17 anion exchange resin in the Cl form. As a result, a gold saturation of resin of 200 g / t was achieved.

 Literature.

 1. Processing of natural salts and brines: a Handbook. I.D.Sokolov et al. - L, Chemistry, 1985, p. 32.

 2. Ion-exchange materials for the processes of hydrometallurgy, wastewater treatment and water treatment: Handbook, 4th ed., Revised. and add. M, VNIIHT, 1989, p. 26.

 3. Polkin S.I., Adamov E.V. Enrichment of non-ferrous metal ores. Student for universities. M, Nedra, 1983, p. 268.

Claims (2)

1. A method of processing potassium ores into potassium chloride by the galurgic method, including leaching potassium chloride from ore with a hot hot solution, clarifying a hot saturated solution, cooling it, separating crystals, drying, heating the working solution and returning it to leach potassium chloride from the ore, characterized in that before heating the circulating solution and returning it to leach, a sample is taken from it, analyzed for gold content and when gold accumulates to a concentration of 10-50 mg / m ³ , the circulating p The solution is fed to a sorption column filled with strongly basic anion exchange resin.  2. The method according to p. 1, characterized in that they use anion exchange resin AB-17 in the Cl form.