SU259384A1 - METHOD FOR REGENERATION OF DISCONTINUED ANTIBRONT SULPHIDE ALKALINE ELECTROLYTE - Google Patents

Description

The invention relates to the field of antimony production by hydrometallurgical methods with the final release of antimony from solutions by electrolysis.

Known p-processes are characterized by low current efficiency, increased power consumption and significant caustic consumption of sodium. The low current efficiency is associated with the progress of electrolytic side processes, such as the reduction of cathode with thiosulfate and polysulfide ions resulting from the anodic oxidation of sulfides.

To improve the technical and economic performance of the process, it is necessary to regenerate the electrolyte, withdraw from the process cycle some of the sulfur accumulating in the electrolyte and recover the thiosulfate, polysulfides and sodium sulfate formed during the electrolysis process.

Methods are known for the regeneration of spent antimony sulfide alkaline electrolyte, including contacting it with solid reducing agents.

The described regeneration method is more efficient and allows reducing and in some cases completely eliminating the consumption of caustic sodium, as well as increasing the recovery of antimony.

This is achieved by the fact that the restoration of the spent electrolyte is carried out with crushed slag of antimony production with teramugure of 90-100 ° C and the ratio of F: T in the pulp from 5: 1 to 7: 1.

The spent antimony sulphide-alkaline electrolyte is the easiest way to process (contact) crushed slag in

heated agitators, for example in a steel jacket with a steam jacket agitator. Preferably, slag from the pyrometallurgical processes of antimony production, such as slag from reflective or electric furnaces, is used.

Before loading into the reactor, the slag is crushed. It is recommended to grind shlak to particles with a size of 0.10-0.15 mm in diameter.

The duration of the electrolyte contact with the slag during the implementation of the technological process in agitators is about 3 hours. The ratio of sour to solid, i.e., the amount of electrolyte relative to the amount of slag, is in the range from 5: 1 to 7: 1, and the temperature of the bed is maintained in the range of 90-100 ° C. Optimum conditions: temperature 95-

As a result. In this treatment, the content of components in the electrolyte is varied in the following way (see table).

After agitation, the pulp is clarified, the regenerated electrolyte of the specified composition is separated from the precipitate by filtration and returned to electrolysis together with antimony-rich solutions obtained at the same enterprise. When leaching antimony concentrates or other antimony-containing products.

In the Irrigation Process of processing waste electrolyte with slag, not only the electrolyte is cleaned and regenerated, but part of the antimony and alkali contained in the slag are dissolved. Thus,

incidental processing of waste slag with

extracting from it parts of antimony and alkali.

Usually, slags of the indicated origin

contain (in%): 1.5-3.0 szfmy, 15-20 pat, 25-30 ferrous oxide and 40-45 silica, the rest is different slag-forming components.

As a result of the described treatment, up to 85% of the antimony contained in it is removed from the slag. It goes into solution and most of the soluble alkali contained in the slag, which reduces the consumption of alkali overhangs, and sometimes completely eliminates it.

The use of regenerated electrolyte instead of spent increases the current efficiency during electrolysis and accordingly reduces the specific energy consumption per ton of produced antimony.

Subject invention

The method of regeneration of the spent antimony sulphide-alkaline electrolyte by contacting it with solid reducing agents, characterized in that, in order to increase the recovery of antimony and reduce the consumption of caustic alkali, the restoration of the spent electrolyte is carried out with crushed slag of antimony production at a temperature of

90-100 ° C and relations W: T from 5: 1 to 7: 1,