CS238913B1 - The method of oxidizing the iron-containing sulfides of non-ferrous metals - Google Patents

Abstract

The invention, which falls within the field of metallurgy and metallurgy, relates to a method for oxidative dissolution of non-ferrous metal sulfides containing iron from sulfide raw materials in an acidic environment. The essence of the method according to the invention consists in the fact that non-ferrous metal sulfides are treated in an environment of sulfuric acid with a concentration of 0.1 to 0.5 mol H2SO4 dm-3 with ozone in an atmosphere of oxygen or air in an amount of 2% of the ozone volume at a pressure of 0.1 MPa and a temperature of 18 to 22 °C. The advantages of the method according to the invention lie in the fact that neither ozone nor oxygen or air pollute the solution, the non-ferrous metal from sulfides is effectively dissolved at ambient temperature and therefore no increase in the temperature of the solution is required.

Description

238913

The invention relates to a process for the oxidative dissolution of iron-containing non-ferrous sulfides from sulphide raw materials in an acidic medium.

Non-ferrous metals are found mostly in sulphide form in nature, both polycyclic and, in virtually all raw materials of non-ferrous metals, iron. Therefore, it is necessary to use non-ferrous metal production methods to selectively obtain non-ferrous metals. Current technology for the hydrometallurgical process for producing non-ferrous metals solves the problems of dissolving their sulfides in an acidic environment as follows: a) Using iron (III) ion as oxidizer. In the following operations, the iron to be extracted is oxidized in the leaching process to give the trivalent form for further use as an oxidant, respectively. its separation from the metal obtained. An efficient process process requires an increase in temperatures up to 90 C. b / Using perchloric acid, hydrogen peroxide, nitric acid, hot concentrated sulfuric acid, chlorine and p. These methods have largely a research character for the high cost of reagents, the difficulty of their recovery and harmful nature of equipment and personnel. On an operational scale, the processing of chalcopyrite ores is carried out with nitric acid. c) Using oxygen at temperatures above 100 ° C and a pressure of 2 to 5 MPa. This method requires high investment and operating costs. d) Use of roasting of sulphide ores by leaching alone to obtain soluble sulphates. This method requires an energy-intensive and environmentally safe roasting operation. e / Anodic dissolution of non-ferrous sulfides. The use of electric power causes high operating costs in this case.

The above-mentioned drawbacks can be overcome by the method according to the invention, wherein the sulphides of non-ferrous metals are treated with ozone in an oxygen or air atmosphere at a concentration of 2% by volume of ozone at a pressure of 0, in a sulfuric acid atmosphere of 0.1 to 0.5 mol. 1 MPa and temperature 18 to 22 ° C.

The principle of this method is based on the dual action of ozone: 1 / The direct oxidative effects of ozone on non-ferrous metal sulphide, which can be described by

MeS + O3 + H2SO4. MeSO 4 + H 2 O

Strong oxidation capabilities of ozone allow dissolution of virtually all metals by temperatures up to 100 ° C and a total pressure of 0.1 MPa. 2 / The oxidative ability of ozone causes oxidation of divalent iron ions to trivalent, which have their own oxidative properties and participate in the oxidation-reduction reaction of:

2Fe2 + + 2H + + O3-2Fe3 + + 02 + H2O

MeS + Fe 2 / SO 4/3> MeSO 4 + FeSO 4 + Se

The main advantages of the method used are that neither oxygen nor ozone or air purifies the solution, non-ferrous metal from sulfides is effectively dissolved at ambient temperature and the tedase does not require increasing the temperature of the solution.

Claims (1)

3 238913 Ozone is obtained in an ozonator based on its generation at a quiet discharge at 10,000 to 15,000 V and frequency! over 10,000 Hz alternating voltage. The conversion of non-ferrous metal into solution is effected at ambient and atmospheric pressure due to the ozone oxidation potential. Example A chalcopyrite concentrate with chemical composition: Cu - 21.23%, Fe - 28.76%, SiO2 = 5.22%, S = 32.02%, Zn = 1.67%, CaO - 0, was used. 7%, ΟσΟ - 0.4%, A12O3. 9.45%, Co - 0.16%. A fraction below 0.056 mm in sulfuric acid was used for the liquefied samples, and 0.1 mol H2SO4 was concentrated. The working atmosphere was oxygen with 2% ozone volume. The material is in constant motion due to mixing with the stirrer and the flow of the working atmosphere to make it in perfect contact with the reactants. After 180 min of dissolution, 87% of the medium was leached out of the flood sample while the solution was not heated and the total pressure above the level was not higher than atmospheric. The oxidation dissolution method of the invention can be used for sulfide concentrates in iron-containing non-ferrous metals. SUBJECT OF THE METHOD Oxidative dissolution of iron-containing non-ferrous sulphides containing sulphidic raw materials in an acidic environment, wherein ozone is produced in the atmosphere of sulfuric acid at a concentration of 0.1 to 0.5 mol H2SO4 dm. of oxygen or air in an amount of 2% by volume of ozone at a pressure of 0.1 MPa and a temperature of 18 to 22 ° C.