A method of processing a mixed tungsten-tin concentrate

 

The invention relates to ferrous metallurgy and can be used for processing tungsten-tin concentrates, obtaining calcium tungstate and compounds of tin. The technical result consists in the selective extraction of tin and its compounds of tungsten and tin concentrates. It is achieved in that the method comprises sintering with soda, water leaching received SPECA and precipitation from a solution of calcium tungstate. As the source material used tungsten-tin concentrate, before sintering to produce regenerative firing of the source material and the electrolytic extraction of tin from the recovered concentrate and sintering with soda expose obtained after electrolytic extraction of tin solid residue. The proposed method allows to obtain a metal tin and calcium tungstate from tungsten-tin concentrates. Removing the tin is 95-97%. 1 Il., 1 PL.

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

A method of refining tungsten concentrate (Patent with.%: hubnerite concentrate: (, Na) nitrate: soda, equal 1:(1,4-0,7):(0,7-0,3) in the liquid bath at a temperature of 320-550C. 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. Technology is not suitable 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 a temperature of 800-900With the receipt of tungsten in the form of sodium salts, leaching received SPECA water at 80-90And deposition of the resulting solution of calcium tungstate.

The disadvantage of this method is the impossibility of extracting tin from tungsten-tin concentrates and pollution tin received calcium tungstate.

The challenge of kotah concentrates. When carrying out the invention obtained calcium tungstate and the metal tin.

This object is achieved in that in the method of processing tungsten concentrates, including sintering with soda, water leaching received SPECA, deposition from a solution of calcium tungstate, unlike the prototype as a starting material using tungsten-tin concentrate, before sintering is conducted regenerative firing of the source material and the electrolytic extraction of tin from the recovered concentrate and sintering with soda expose obtained after electrolytic extraction of tin solid residue.

The invention is illustrated by diagram (drawing), which depicts the sequence of operations performed during the processing of tungsten-tin concentrate.

An example of performing the method,

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.

Removing the tin in electr the Oia (75 g/l), sodium hydroxide (10 g/l), sodium acetate (25 g/l). Electrolysis takes place in a graphite cell. The cathode used steel sheets. The anode is loaded charge. After deposition of tin on the cathode slurry is filtered 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 after electrolysis in it was found the contents of the tin (in terms of SnO2) 2.5 wt.%. As a result of heating the cathode to a temperature above 500With the obtained metal tin.

Removing the tungsten

Sintering with soda

The solid residue obtained after electrolytic extraction of tin, mixed with soda ash. Sintering is carried out in a tubular furnace.

Water leaching

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 ferrosulfate.

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 0.05 wt.%.

The proposed method allows to obtain a metal tin and calcium tungstate from tungsten-tin concentrates. Removing the tin was 95-97%.

Claims

A method of processing tungsten concentrates, including sintering with soda, water leaching received SPECA and precipitation from a solution of calcium tungstate, characterized in that as starting material used wolframalpha concentrate, before sintering is conducted regenerative firing of the source material and the electrolytic extraction of tin from the recovered concentrate and sintering with soda expose obtained after electrolytic extraction of tin solid residue.

 

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FIELD: reprocessing of waste metals.

SUBSTANCE: claimed method includes waste treating with chlorine in presence of carbon tetrachloride at 20-600C followed by tin deposition with ammonia hydroxide solution. Method of present invention is useful in tin recovery from debris and other metal tin-containing waste.

EFFECT: simple and selective method; simplified equipment.

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