A method of processing mixed concentrates wolframalpha

 

The invention relates to ferrous metallurgy and can be used for processing mixed fortraveling concentrates, obtaining calcium tungstate and compounds of tin. The technical result consists in obtaining high-quality raw materials for the production of ferrosulfate and compounds of tin. In the method of processing first produce reductive roasting of the concentrate, and then burned the concentrate is subjected to acid leaching. The resulting solution is directed to the extraction of tin by known techniques, and the solid residue after acid leaching by sintering with soda, subsequent water leaching and precipitation remove the tungsten in the form of calcium tungstate. The method allows to obtain pure tin and its compounds calcium tungstate, and the hydroxide and tin dioxide. Removing the tungsten was 97-98%. 1 table, 1 Il.

The invention relates to ferrous metallurgy and can be used for processing mixed wolframalpha concentrates, obtaining calcium tungstate and compounds of tin.

A method of refining wolframite concentrate (Kaminsky Y. D., Matsenko Y. A., Pologruto Century A., Kopylov the range during heating of the charge to mass ratio of the components in it, wt. %: hubnerite concentrate: (K, Na) nitrate: soda, equal 1:(1,4-0,7): (0,7-0,3) in the liquid gas bath at a temperature of 320-550oC. the resulting alloy is subjected to hydrometallurgical processing by known techniques to produce commodity tungsten product.

However, the known method has a significant drawback. The presence of nitrates (K, Na) leads to harmful emissions into the atmosphere. The technology unsuitable for processing concentrates contaminated with impurities of tin, since the latter when processing enters tungsten product, reducing its quality characteristics.

The closest in technical essence and the achieved positive effect of the present invention is a method (Zelikman A. N., Nikitina L. S. Wolfram. M.: metallurgy, 1978, S. 33-34) processing of tungsten raw materials by sintering it with soda at 800-900oWith the receipt of tungsten in the form of sodium salts, leaching received SPECA water at 80-90oAnd deposition of the resulting solution of calcium tungstate.

The disadvantage of this method is the impossibility of processing tungsten concentrates contaminated with impurities of tin and its compounds.

The technical result is getting Vysokaya fact, a method for processing tungsten concentrate, comprising sintering concentrate with soda, water leaching received SPECA, deposition from a solution of calcium tungstate, before sintering with soda perform the recovery roasting of the concentrate, acid leaching recovered concentrate, separating the solution from the concentrate and the deposition of tin from the solution obtained. The residue after acid leaching then bake with soda and after leaching and precipitation remove the tungsten in the form of calcium tungstate.

The invention is explained by the drawing, which shows a sequence of operations performed during the processing of mixed wolframalpha concentrate.

An example of performing the method of: 1st regenerative firing.

After preparation of starting materials of the components of the mixture are mixed in a predetermined ratio and loaded into the crucible. Poured on top carbon layer covering the surface of the mixture, or use a vacuum with a purpose to protect the upper layers of the charge against oxidation. Restoring flows in an electric or fuel furnace.

1st acid leaching.

After the regenerative firing the charge loaded into the autoclave. For pixelation is sent to obtain compounds of tin, and the solid residue on the filter, in case of high content of tin, after repulpable sent for re-regenerative firing. As a result of chemical analysis of the solid residue of the first acid leach in it was found the contents of the tin (in terms of SnO2) 3 wt.%. Further extraction of calcium tungstate concentrate resulted in an increased content of tin and incomplete extraction of tin as tin dioxide. Therefore, repeated recovery roasting and acid leaching.

2nd regenerative firing.

The solid phase after repulpable and add dry the coal in the amount of 10% of its weight. Generate a second regenerative firing.

2nd acid leaching.

Obtained after the second firing of the charge is sent to the autoclave leaching. Then the contents of the tank is filtered and the solid residue is subjected to repulpable. The resulting solution was used for the first acid leach. The solid residue is subjected to 3-d recovery roasting and leaching in the presence of significant residual concentrations of tin in it.

Sintering with soda.

The concentrate after the second acid leaching and subsequent re is

Sintered crushed and subjected to water leaching. Then the contents of the tank is filtered and dried solid residue is directed to the production of construction materials.

The deposition of calcium tungstate.

From the solution obtained by filtering in the previous phase, precipitated calcium tungstate by means of calcium chloride. The solution is subjected to decantation. The obtained white precipitate after filtration is subjected to drying and receive calcium tungstate, which is the raw material for the production of ferrosulfate.

The precipitation of the hydroxide of tin.

From the solution obtained after the first leaching, precipitated hydroxide of tin ammonia solution at a given pH. After obtaining a white precipitate contents of the tank filter. In the calcination of the hydroxide of tin receive dioxide tin. The results of the experiment and the parameters given in the table.

Chemical analysis showed the content of tin in the initial concentrate (in terms of SnO2): 12.0 wt.%, and in the concentrate after the second calcination and leaching of 0.1 wt.%. The residual content of tin (in terms of SnO2in the calcium tungstate is 0.06 wt.%.

The proposed method allows to obtain pure tin and its compounds volm;">Claims

A method of processing tungsten concentrate, comprising sintering concentrate with soda, water leaching received SPECA, deposition from a solution of calcium tungstate, wherein prior to sintering with soda perform the recovery roasting of the concentrate, acid leaching recovered concentrate, separating the solution from the concentrate and the deposition of tin from the solution obtained.

 

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