SU45285A1 - The method of obtaining tungsten anhydride or acid from tungsten ore concentrates, in particular scheelitovogo - Google Patents

Description

The processing of tungsten concentrates to extract tungsten anhydride therefrom is carried out everywhere by treating these concentrates either with acids or alkalis. In the first case, either hydrochloric acid or a mixture of hydrochloric and nitric acid is used. In the second case, for example,

soda or a mixture of soda and nitrate, or, finally, a mixture of soda and clean sand (in the case of scheelite processing). The most common alkaline method is as

less harmful to the health of working personnel and equipment. However, even with another method of operation, the decomposition of tungsten concentrates and the removal of tungsten from them. The final product — tungsten anhydride or acid — comes with significant losses — no more than 70-72% of the original amount of WOs is recycled. below and is only 45-55%. The proposed new method is as follows. Tungsten concentrate, in particular scheelite, ground as usual, into powder, is mixed: with crushed aluminum and subjected to aluminothermic smelting according to Goldchmidt’s conventional method. In this case, the reaction occurs.

; CaWO, + 2 + fllaOsCaO

(

and tungsten is released in the form of a metal ingot. Instead of aluminothermic melting, electrothermal can be used. To improve yields, which usually reach 95% tungsten, you can add to the mixture some quantity of a mixture of iron oxide (preferably high-speed tungsten steel) and a corresponding additional amount of aluminum, as a result of which high-purity tungsten is released, but not pure tungsten. Instead of an iron-tungsten alloy, manganese-tungsten can be obtained. By treating a tungsten concentrate directly, ferro-tungsten is obtained. Ferro-tungsten smelting is also possible electrolytically in the form of ferro-tungsten.

The tungsten or ferro-tungsten ingot formed undergoes crushing and grinding, and then oxidative roasting in a hearth-burning furnace at 800 °, resulting in a powdery mass of tungsten trioxide or its mixture with iron oxides. This material, which is the most concentrated tungsten intermediate, is then subjected to the usual processing by the acid or alkaline method on a chemically

pure tungsten anhydride or acid. This method of operation allows for a significantly higher recovery or use of tungsten than are currently known and used methods.

The subject matter of the invention.

1. A method for producing tungsten anhydride or acid from tungsten ore concentrates, in particular, Scheel 3 .----- i

TObord, with the use of acid or alkali treatment, characterized in that the concentrate is preliminarily subjected to metallurgical processing in order to obtain iron and marc of a face-tungsten alloy, which, after oxidative roasting, is subjected to a specified chemical treatment. 2 The method of carrying out the method of claim 1, wherein the metallurgical treatment is carried out by aluminum electrothermally.

-U1№M У -Ч,,. ...

.eaasH MPes

.-jjiEB-, -l-t-D: - # v.-4gch;