SU644858A2 - Method of extracting copper from secondary raw material containing copper - Google Patents

Description

one

The invention relates to non-ferrous metallurgy, in particular to the processing of copper-containing raw materials, such as scrap electric motors, and is an addition to the invention in accordance with the authors. St. No. 379659.

There is a method of extracting copper from secondary copper-containing raw materials in August. St. No. 379659 1.

According to this method, raw materials, such as scrap of electric motors, consisting on average of 20% copper, 78% iron and 2% insulating materials, are subjected to non-oxidizing roasting at 500-600 ° C and leaching with ammonium sulfate electrolyte containing ammonium persulphate. Leaching is carried out without heating with a solution containing, g / l: 20-30 copper, 30-60 ammonia, 160-250 ammonium sulfate and 15-20 ammonium persulfate. The copper-saturated solution is filtered through a layer of metal shavings filled with activated carbon and electrolyzed to precipitate copper with insoluble anodes at a cathode current density of 500 A / m and a dense shiny precipitate of copper is obtained. The spent electrolyte is re-leached.

The disadvantage of this method is that with increasing current density

cathode deposits are deteriorated, their relief and cellular content increase, especially with prolonged electrolysis, which ultimately reduces the performance of electrolysis. At the same time, the use of high current densities for copper extraction requires an increase in the rate of copper leaching from waste.

The aim of the invention is to increase the efficiency of the process by accelerating the copper leaching and the possibility of conducting the process of electrolysis with a higher current density.

The goal is achieved by the fact that

ammonium sulfate solution is injected

a mixture of benzenesulfonic acid with sulfonol,

taken at a ratio of 1: (50-100).

The essence of the proposed method is as follows: secondary copper-containing raw materials containing iron, for example, motor scrap, after removal of the electrically insulating material are leached with a solution

containing 20-30 g / l of copper, 30-60 g / l of ammonia, 160-250 g / l of ammonium sulfate and 15-20 g / l of ammonium persulfate, in which a mixture of benzenesulfonic acid and sulfonol is taken, taken in a ratio

1: (50-100). Leaching is carried out at

continuous circulation of the solvent through the feedstock and the solution obtained after leaching is filtered through a layer of activated carbon metal shavings. The resulting solution is fed to the electrolytic extraction of copper with insoluble anodes at a current density of 800 A / m. The spent electrolyte re-enters the dissolution of scrap electric motors. After the copper is dissolved, the scrap iron is sent for further processing. Cathodic copper deposits obtained by the proposed method have a smooth, smooth structure over the entire surface of the electrode.

Example 1. 1000 g of baked scrap electric motors are loaded into a laboratory reactor, where an electrolyte containing g / l: copper-25, ammonia 55, ammonium sulfate -200, ammonium persulfate -19 is fed continuously, after which a mixture containing , g / l: sulfonol-5, benzenesulfonic acid-0.1. Dissolve without heating. As a result of leaching, the copper concentration increases in 6.8 hours to 80 g / l. The solution is then filtered through a layer of metal chips filled with activated carbon and sent to an electrolysis bath with insoluble anodes to release copper at a current density of 800 A / m. As a result, 210 g of copper cathode are obtained, having a dense flat surface, a fine-crystalline structure, without cells and dendrints. Removal of copper-16.2 kg s / m cathode surface per day.

Example 2. In Example 1, g / l was introduced into the electrolyte: sulfonic acid 5, benzenesulfonic acid 0.05. Within 6.9 hours, the solution is saturated with copper to 80 g / l. 200 g of high-quality cathode copper are obtained by electrolysis. Removal of copper 15.8 kg with 1 m cathode surface. Cathodic sediment similar to example 1.

The application of the proposed method makes it possible to intensify the process of extracting copper from secondary copper-containing raw materials. The introduction of a mixture of benzenesulfonic acid with a sulfonic acid into the electrolyte, which is a strong surfactant, makes it possible to obtain high-quality precipitates of medp at density

current 800 A / m, increase the removal of copper by 1, Zraza from 1 m of the cathode surface and the rate of copper leaching by 1.1-1.2 times compared with the existing method for extracting copper according to the basic invention.

Claims (1)

Invention Formula The method of extraction of copper from secondary copper-containing raw materials for auth. St. No.379659, characterized in that, in order to increase the efficiency of the process by accelerating the copper leaching and allowing the electrolysis process to be carried out at an increased current density, a mixture of benzenesulfonic acid and sulfonol in a ratio of 1: (50-100 ). Information sources, taken into account during the examination 1. USSR Copyright Certificate No. 379659, C 22 B 7/00, 1971.