SU402569A1 - METHOD FOR EXTRACTING METALS FROM MATERIALS. CONTAINING OXIDES OF THESE METALS. RECOVERY - Google Patents

Description

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The invention relates to the field of non-ferrous metallurgy, and, in particular, to a method for the regeneration of refining fluxes used in smelting, for example, copper.

A known method of extracting metals from materials containing oxides of these metals, by reducing oxides with carbon.

The proposed method differs from the known ones in that the spent refining flux containing metal oxides is melted in a graphite crucible in contact with a copper melt, containing metal reducing agents, and removed at a temperature of 1200-1400 ° C with periodic displacement of the copper melt and flux .

As reducing metals, one or more reducing metals selected from the group containing silicon, aluminum, magnesium, and calcium are introduced into the copper melt.

Such peculiarities of the implementation of the process make it possible to rschereniruyu spent refining fluxes electroslag remelting copper enlavov. The proposed snoot consists of the following.

A graphite crucible of an induction furnace, preheated to a temperature of 1200-1300 ° C, is loaded with a small amount of copper, or copper alloys with additives of aluminum, magnesium, calcium or silicon, and waste electrolytic flux in the form of 5-50 .i.it pieces. Tyge.t cover graphite and include heating.

After the first melting of the Ilac, the melt is periodically mixed with a graphite me- tal and kept for 15-30 min at a temperature of 1300 ° С, the HC of the tolerance for its overheating is the IEP.

Experiments have shown that the recovery of copper and chromium oxides from spent flux M-2 with carbon crucibles begins in a solid state.

The recovery speed is increased with

an increase in temperature.

However, when the slag melt is heated to temperatures above 1400 ° C, evaporation from the aluminin fluoride plaque begins, along with the intensive reduction of CuO and CrO2. At the same time, its composition changes and, if reused, requires adjustment, i.e., additional addition of A1P3.

Therefore, the optimum processing temperature of the spent refining fluxes

is 1300 ° C. At this temperature, the duration of regeneration of one of the flux portions does not exceed 0.5 hour and ensures a decrease in the content of CuO and CrcO3 in the slag from 6-8 to 1.5-2.5% each.

About the end of the regeneration trial color

F.Poss, which ii.j dark gray or green turns into light gray. At the end of the regeneration, the crucible is applied to the graphite mold and the slag together with the metal is drained. After cooling down, the Hllac is removed from the mold, separated from the metal, crushed and chemically analyzed, and the content of axis components and impurities. The main features of the proposed method are only in the possibility of multiple use of refining fdyusov, which allows to reduce the cost of the electron electron lacquer and copper alloys, io and in such a way that with such processing it can be possible to extract and return to production 60-70 % of copper and chromium, oxidation p) and conducting electroslag andplava.

PREd. M et and z about b and e and u

1. A method for extracting metals from materials containing oxides of these metals, by reducing oxides with carbon, characterized in that, in order to regenerate spent refining fluxes of electroiloil copper alloy melts, the flux is melted in a graphite crucible in a co-tact with media containing metal containing metals. reducing agents, and maintained at a temperature of 1200-1400 ° C with periodic mixing of the copper melt and flux.

2. Method for and. 1, characterized in that the copper melt contains one or more reducing metals selected from the group consisting of cremation, aluminum, magic, calcium.