SU777074A1 - Method of working up slag of nickel and copper production - Google Patents

Description

one

The invention relates to non-ferrous metallurgy and can be used to extract non-ferrous metals, mainly cobalt, from slags obtained by converting copper and nickel mattes.

There is a well-known method of depleting slags from nickel and copper industries, including their treatment with solid or liquid sulfide material, solid carbonaceous reducing agent, flux delivery and production of coke-rich matte and depleted slag ij.

The disadvantage of this method is the insufficient transition of cobalt to the extraction phase.

The purpose of the invention is to increase the recovery of cobalt from slag.

This goal is achieved by using ore with a ratio of copper to nickel (1.5-5): 1. as ore sulfide material. The method is carried out as follows. Slag processing is carried out, for example, in electric furnaces, liquid slag is poured into the furnace, and periodically the carbonaceous reducing agent — coal coal, quartz flux, and sulfidizing agent — is charged into the furnace.

rich copper-nickel ore to form a matte-extracting phase.

Cobalt-enriched matte and depleted slag are periodically released from

5 ovens.

The decrease in the residual cobalt content in the sclac is due to an increase in the activity of iron in the matte phase under the influence of an increase in the concentration

10 in her copper, which improves the distribution of cobalt in the system slag-metallized matte, and in addition, a lower content of cobalt in mattes obtained from ores of this composition. The fact of the indicated effect of the copper concentration in the matte phase on the extraction of cobalt from the slag to the last was established in a laboratory study and confirmed under the conditions of industrial electro20 of converter slag.

Example.

Claims (1)

The converter slag, containing foreground about H% nickel, 0.8% copper and 0.25% 25 cobalt, was poured in portions of 60-75 tons into a rectangular three-phase electric furnace with self-interrupting electrodes. The furnace was periodically loaded with: - coal plug (in the amount of 4-6% of slag); -quartz sand with a content of 68-69% silica in an amount to ensure its content in the furnace slag in the range of 30-35%; - vein copper-nickel ore with an average grade, nickel 3.23%, copper 9.02%, i.e., with a ratio of copper and nickel, equal to 2.8. The duration of the smelting of converter slag with this ore was 14.7 six-hour shifts, with a complexity of slag processing of 144 tons and an average furnace operating capacity of 8.44 MW. is Waste slag obtained during this time had an average cobalt content of 0.05% and nickel 0.066%. Processing in the same furnace converter slag of the same average composition for 20 times close to the specified (149 six-hour shifts), with almost the same performance values (148 tons) per day and working capacity of 8.86 MW, but when used as sulphide Additives of 25 ores with a nickel content of 3.92%, copper of 3.81%, i.e., with a ratio of copper and nickel of about 1%, gave waste slag containing, on average, with the same silica content 0.068% cobaltazo and 0.082% nickel. The results show a decrease in cobalt 5 10 losses in the process of electric furnace processing of converter slag when copper-nickel ore is added to the latter with almost threefold predominance of copper over nickel compared to the process when ore is added with approximately the same content of more than 25% relative to both metals. Under the conditions of this plant, this means an increase in the extraction of cobalt from the raw material by almost 3% absolute. DETAILED DESCRIPTION OF THE INVENTION A method for depleting slags from nickel and copper production, including treating them with solid or liquid sulfide material, solid carbonaceous reducing agent, supplying flux and producing cobalt rich depleted slag, in order to increase the recovery of cobalt from the slag, Copper-nickel ore with a ratio of copper to nickel (1.5-5) is used as a sulfide material: 1. Sources of information taken into account during the examination 1. V. Smirnov et al. Extraction of cob viola from copper and nickel ores and concentrates. M ,, Metallurgists, 1970, p. 163-165.