SU933772A1 - Method for recovering tungsten from concentrated tungsten-containing raw material - Google Patents

Description

(5) METHOD FOR EXTRACTING TUNGSTEN FROM LABEL-RELATED TUNGSTEN CONTAINING RAW MATERIALS

I

This invention relates to the metallurgy of rare metals, namely tungsten.

Methods are known for extracting tungsten from a hard-to-treat tungsten-containing raw material, including burning the raw material with various reagents and then leaching the calcined products.

Closest to the proposed method for extracting tungsten from a hard-to-treat tungsten-containing. raw materials, including blending of raw materials with soda and roasting followed by leaching of the obtained stubs with water p.

The disadvantages of this method are the use of expensive reagent - soda and the formation of soda with the components of the processed raw materials of low-melting mixtures, which leads to the melting of the charge and the appearance of tungsten in furnaces, as well as a decrease in the degree of tungsten recovery due to losses.

The aim of the invention is to increase the degree of extraction of tungsten, reduce the cost and exclude losses.

The goal is achieved by using magnesium salts as a reaction additive, and the mixture is granulated before firing.

The method is as follows.

The processed raw materials are charged with

10 magnesium salts, including magnesium - dolomite with the most common natural compound. The resulting mixture is granulated and calcined in a shaft furnace at 800 ° C for

15 3,. 0 h. During mine firing, dust removal is sharply reduced, technical and economic indicators and labor conditions are improved. Granulation intensifies the interaction of components

Claims (2)

charge. The use of magnesium salts contributes to the effective opening of the clay fraction, in particular montm J) ilonit. 393 Example 1. Ore of the following composition, wt.%: Woy 0.56; B, 0, AlaOs 10.89; . 13.96; CaO 17.7 and others are crushed to a class of 0.16 mm and mixed with magnesium carbonate in a very high ratio of 1: 1. The mixture is granulated. Size of granules 6-9 mm. The granules are dried and calcined for 3.5 m. Then the calcine is leached in an autoclave with a solution of caustic soda with a concentration of 120 g / l at. The leaching time is 2 hours at. The speed of rotation of the autoclave around the transverse axis is about 50 rpm. At these levels, the degree of extraction of tungsten is 97.51. Example 2. The ore of example 1 is crushed to a class of 0.16 mm and mixed, with dolbmit in a weight ratio of 1: 1. The mixture is granulated. Size of granules 6-9 mm. The granules are dried and calcined for 4 hours. Then the candle is leached in auto clave with caustic soda solution with a blend of 160 g / l at. Leaching time 2 h at. The rotation speed of the autoclave around the transverse axis is about 50 rpm. Tungsten recovery rate 93. For comparison, similar experiments were carried out using soda. The degree of extraction of tungsten in a solution of 90.5%. When this is observed, the charge is reflowed, as well as the transition of a significant part of silica, aluminium and iron to the solution, which complicates the subsequent processing of the solution. Claim method A method for extracting tungsten from a hard-to-enrichment tungsten-containing raw material includes blending the raw material with a reaction additive and firing followed by leaching, characterized in that magnesium salts are used as an additive to increase the degree of tungsten recovery, reduce the cost and eliminate losses. The mixture is granulated. Sources of information taken into account in the examination 1. A. Zelikman, G. Meerson. Metallurgists of rare metals. M., Metallurgists, 1973.