CS238914B1 - The method of oxidizing the sulfides from sulphide raw materials - Google Patents

Abstract

The invention, which falls within the field of metallurgy and metallurgy, relates to a method for oxidative dissolution of copper sulfides from sulfide raw materials. The essence of the method according to the invention is that copper sulfides are treated 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 in a sulfuric acid environment with a concentration of 0.1 to 0.5 mol H2SO4 dm“3. The main advantages of the method according to the invention are that neither ozone nor oxygen or air pollute the solution, copper from sulfides is effectively dissolved at ambient temperature and therefore no increase in the temperature of the solution is required.

Description

The invention in the field of metallurgy and metallurgy relates to a method of oxidizing dissolution of sulfides by medium from sulfide raw materials.

The essence of the process according to the invention consists in that on the sulphides of the medium, in the medium of sulfuric acid with a concentration of 0.1 to 0.5 mol H2SO4 dm ^3, ozone is treated with ozone in an atmosphere of oxygen or air in an amount of 2% of ozone and a temperature of 18 to 22 ° C.

The main advantages of the process according to the invention are that the ozone and oxygen, or the air does not contaminate the solution, the copper from the sulphides is effectively dissolved at ambient temperature and thus does not require increasing the temperature of the solution.

The invention relates to a process for the oxidative dissolution of sulphides by medium from sulphide raw materials in an acid medium.

Current technology of hydrometallurgical method of production of media solves the problem of dissolution of sulphides by media in acidic environment as follows:

a. Using i < 5µm of ferric iron as an oxidant. The use of this method results in iron ion contamination, which needs to be removed in a subsequent operation and requires an increase in solution temperatures of up to 90 ° C for efficient dissolution, which is an energy expenditure.

b. Using perchloric acid, hydrogen peroxide, nitric acid, hot concentrated sulfuric acid, chlorine. While these methods are of a research nature for the high cost of reagents.

c. By using oxygen at temperatures above 100 ° C and a pressure of 2 to 5 MPa. This requires high investment and operating costs.

The above-mentioned drawbacks can be overcome by the method according to the invention, characterized in that the sulphides of the medium are treated with ozone in an oxygen or air atmosphere of 2% by volume of ozone at a concentration of 0.1 to 0.5 moles of H2SO4. pressure 0.1 MPa and temperature 18 to 22 ° C.

Total sulfide dissolution reaction with media using ozone

3CU2 S + Oj + 3H ₂ SO ^ 6 CuSO 4 + 3H ₂ O consists of 2 stages:

I. 3Cu ₂ S + Oj + 3H ₂ SO ₄ -, ----------- 3CuS + 3CuSO ₄ + 3H ₂ O

II. 3CuS + 40j- ^ 3CuSO ₄

In particular, the advantages of the process according to the invention are that ozone and oxygen or air do not contaminate the solution, the sulphide honey is effectively dissolved at ambient temperature and thus no increase in the temperature of the solution is required.

Ozone is obtained in an ozonator based on its generation at a silent discharge at a voltage of 10,000 to 15,000 V and a frequency above 1,000 Hz of alternating current. Conversion of the medium into solution in this manner is effected efficiently at ambient temperature and atmospheric pressure due to the high oxidation potential of ozone;

Example

Synthetic Cu ₂ S, copper ( _II ) sulphide, known as chalcosine mineral of 80.07% Cu, 20.002% S and a fraction below 0.056 mm in a sulfuric acid medium ending at 0.1 mol ^H 2 ^SO 4 ^{per dm} · was used for the tests.

The material was in constant motion due to agitator stirring and working atmosphere flow so that it was in perfect contact with the reagents (ozone in an oxygen or air atmosphere of 2% ozone volume).

After 180 minutes of dissolution, 52, 129% of the leachate was leached from the original sample while the solution was not heated and the pressure above the solution level did not exceed atmospheric pressure.

The method of oxidative dissolution in an acidic environment can be used for most sulfide metal raw materials due to the high oxidation potential of ozone. Lower possibilities are in the use of acid oxidative dissolution using ozone to process secondary metallurgical raw materials such as slag, ash, smears, sludge and others.

Claims (1)

3 238914 OBJECT OF EXPRESSION A method of oxidising the sulphides with a medium of sulphide raw materials in an acid medium, wherein the sulphides in the medium are treated with ozone in an oxygen or air atmosphere in an amount of 0.1 to 0.5 mol of H 2 SO 4 dm. 2% by volume at a pressure of 1 MPa and a temperature of 18 to 22 ° C,