SU1477787A1 - Electrochemical method of processing sulfide copper concentrates - Google Patents

Abstract

The invention relates to the field of non-ferrous metallurgy, in particular to the processing of sulphide copper concentrates, and can be used in the preparation of copper powder from them. The purpose of the invention is to reduce power consumption and increase current utilization. According to the invention, the concentrate is melted on matte, the anodes are cast from matte and their electrochemical dissolution is carried out in a sulfate-chloride electrolyte at a cathode current density of 700-800 A / m ² , an anode current density of 500-600 A / m ² with chlorine ion concentration in electrolyte 65-70 g / l. 2 tab.

Description

The invention relates to non-ferrous metallurgy, in particular to the processing of sulphide copper concentrates, and can be used in the preparation of copper powder from them.

The aim of the invention is to reduce power consumption and increase current utilization.

The method is carried out as follows.

Copper concentrate is melted on a matte with a copper to iron ratio of 0.5-3.0, and the anodes are cast from the obtained matte in the form of separate sections with a width of 1 / 2-1 / 4 of the width of the industrial anode (the length and thickness correspond to the full size of the anode ), curtain 2-4 sections for one bar,

placed in the diaphragm bags in the electrolyzer h electrolyzed. The process is conducted at an anode current density of 500-600 A / m2, a cathode current density of 700-800 A / m2, an electrolyte temperature of 60-70 ° C, with a chlorine ion content of 65-70 g / l. Copper sheets with a thickness of 4–5 mm and an area allowing for a cathode current density of 700-800 A / m2, i.e. their total area should be somewhat less than the total area of the anodes. Copper powder is obtained at the cathode, the iron is converted into a solution and recovered as a sulfate salt, sulfur in elemental form, and noble metals are concentrated in the anode slurry.

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When the values of the anodic current density (Od) are less than 500 A / m2, the dissolution rate decreases, i.e. the productivity of the process, the anodic potential of dissolution is reduced, the yield of the anode slime increases. When Od is greater than 600 A / m2, power consumption and anode sludge output increase.

Laboratory studies are carried out in electrolysers with a volume of 1 liter, installed in a thermostat. An anode weighing 500-600 g and working dimensions 10-60-15 mm is hung between two cathodes of size 50-45-2 mm. Depending on the experimental conditions, the anodic current density varies 400-700 A / m2, the current load is 6.5-10.5 A, the electrolyte temperature is 65-70 ° C.

The electrolyte used is sulphate-chloride solution of the following composition, g / l: Cu 1, GenachZO-40 with allowance for accumulation up to 60-70 g / l, H2 S04 30-35. The concentration of chlorine ions in the electrolyte varies from 60 to 80 g / l. Stirring is carried out by continuous recirculation of the electrolyte at a rate that makes it possible to replace the bath volume in 1.3-1.5 hours.

The effect of the anodic current density on the electricity consumption during electrolysis and the anode current output is given in Table. 1 (ionic chlorine concentration in the electrolyte is 67 g / l).

The effect of the concentration of chlorine ions in the electrolyte on the performance of the process is given in Table. 2

Anode current density 550 A / m2, cathode current density 700 A / m2.

As follows from the table. 2 data, the proposed method of processing sulfide copper concentrates allows to reduce power consumption and increase current utilization.

Claims (1)

Invention Formula Electrochemical method of processing sulfide copper concentrate including smelting concentrate on matte with a copper to iron ratio of 0.5-2.0, casting anodes from it and their electrochemical dissolution in an acidic aqueous sulfate-chloride electrolyte at a cathode current density of 700-800 A / m2 s obtaining copper powder on the cathode, characterized in that, in order to reduce electricity consumption, increase the current utilization factor, the anode electrolysis is carried out at an anode current density of 500-600 A / m2 in an electrolyte with an ion concentration chlorine 65-70 g / l. Table 1 2,00,8 2.1; 2.5; 3.0 1.6-30.1 2.1; 2.5; 3.0 0.5-0.8 table 2 Copper powder corresponds to GOST Copper powder does not comply with GOST Copper powder corresponds to GOST