SU1709080A1 - Method of anglesite leaching - Google Patents

Abstract

The invention relates to the mining industry, in particular to the extraction of minerals by the method of underground leaching. The goal is to increase the degree of extraction of anglesite from the rock mass and improve the environmental conditions of production. The crushed rock mass is treated with an aqueous solution of potassium nitrate and / or aluminum nitrate, after which the productive solution is processed. 1 tab.

Description

The invention relates to mining (geotechnology) and can be used in the development of mineral deposits.

There is a method of developing ore deposits by selectively transferring the useful component to the liquid phase in the subsoil with the subsequent processing of metal-containing (production) solutions. In underground leaching, the metal is recovered by ion exchange in the process of controlled movement of the reagent through an array with natural permeability previously destroyed by various methods or carbonated ore.

The known method is not environmentally friendly because the chemicals used pollute the environment and poison the bowels of the Earth.

There is also known a method for extracting useful components (soda and alumina from dawsonite-containing raw materials), including

the treatment with a leaching solution of sodium hydroxide and the processing of the production solution, the leaching solution being fed with a concentration of sodium hydroxide in it of 1-5% into the dawsonite formation. however, before applying the solution, create artificial permeability of the reservoir, and when. processing the production solution is subjected to carbonization with the release of the aluminum product and subsequent evaporation with the release of soda.

This method is also not environmentally friendly due to the use of sodium hydroxide.

The purpose of the invention is to increase the degree of extraction of the useful component and improve the environmental conditions of production;

Claims (1)

The proposed method for the extraction of anglesite by leaching involves treating the rock mass with a leaching solution and its subsequent processing, while using an aqueous solution of potassium nitrate and / or aluminum nitrate as the leach solution. English chemical (PbSO4 chemical formula) is one of the major lead ore minerals. As a hardly soluble product of the oxidation of galena and other sulfur compounds of lead, anglesite is formed mainly in the oxidation zones of lead-zinc sulfide deposits: PbS + 202- PbS04. The solubility product of lead sulfate in water is only 1.6 "10, and the logarithm of the solubility product is 7.80. Anglesite is also practically insoluble in dilute acids and solutions of alkalis of low concentration. For this reason, no anglosite is mined by means of the in-situ leaching. Since anglesite is usually only a minor admixture to the major lead-zinc minerals and occurs as a diffuse impregnation in the rock mass, it is not extracted from it even when the ore is enriched, in water it increases 14 times, and in the presence of 1 kmol / m aluminum nitrate - 77 times. With a joint effect (the molar ratio of the indicated chemical reagents was equal to 1: 1), the solubility of anglesite increases by a factor of 62. For comparison, we point out that 0.1 N, sulfuric acid increased the solubility of anglesite by only 9 times: a 3% aqueous solution of sodium hydroxide (prototype method) - only 11 times, At the same time, it is known that, as acids, and alkalis are components harmful to the environment. Chemicals used in the inventive method. (potassium and aluminum nitrates) are convenient Efficiency and personal; therefore even their small leaks will enrich the soil with nitrogen and potassium, which will have a positive effect on vegetation, and consequently, on the ecological situation around the mining enterprise, i.e. . The proposed method is aimed at developing environmentally friendly geotechnology. PRI me R. Dumps of the Turlansky deposit (Kara-Tau ridge) are taken as an anglesite-containing rock. Sample weight 1 kg. Each sample was treated with 10 liters of solution with vigorous stirring for 10 minutes. The liquid from the solid phase was separated by filtration. Solution 1 - 0.1 n. sulfuric acid. A solution of 2 - 3% aqueous solution of sodium hydroxide. Solution 3 - potassium nitrate solution (100 g / l). Solution 4 - aluminum nitrate solution (100 g / l). The results of the experiments are listed in the table (according to spectral and chemical analyzes). Thus, the proposed method provides a rather high degree of extraction of the useful component (38–70%), which is 2–3.5 times higher than the efficiency of the prototype method. Claims method of extracting anglesite by leaching, which includes treating the rock mass with a leach solution and further processing the productive solution, characterized in that an aqueous solution of potassium nitrate and / or is used as a leach solution to increase the degree of extraction of the useful component aluminum nitrate. Yeni Anglesite Razi solutions