SU64917A1 - The method of finishing gravity tungsten concentrates - Google Patents

Description

Almost all tungsten concentrators in primary gravity plants (canteens, sluice, after jigging). Concentrates and products in a significant amount of concentrate concentrates sulfide sulfides (pyrite, chalcopyrite, etc.).

The current IB standards for tungsten enditerates allow for a maximum sulfur content of up to 3%; therefore, refining tungsten concentrates to sulfur: In large grades (0.5–4 mm) it is a difficult task, since it cannot be solved by gravity.

The finishing of the indicated products is usually carried out in the following ways:

1. Removal of sulfur by firing.

2. Burning followed by the electromagnetic. separation.

3. Flotation of sulfides with preliminary grinding of the source material to 0.5.

Of these methods, only the first, under appropriate conditions, does not lead to large losses of tungsten during fine tuning; however, this method requires Solid firing and almost does not almost increase the concentration of tungsten in the starting material.

The second method is inconvenient in that it requires roasting of the starting material and, moreover, as a rule, leads to great losses of tungsten due to sintering and fusion of grains of sulphides with grains of starch or wolframite.

The third method is associated with a very desirable operation — shredding; Since tungsten minerals (wolframite, pobnerite, fernert, shcheleit) are characterized by increased brittleness, a significant amount of lamella is formed during grinding, which leads to sensitive metal loss in further operations.

The method proposed by the present invention is characterized in that the starting material is pre-agitated for 8-10 minutes successively with sulfuric acid, xanthate and kerose, after which it enters the concentration table (jigging machine), where the flotation of sulphides and the concentration of other minerals occur simultaneously weights. In this case, the sulphides float perfectly pure with an insignificant content of WOs (0.03-0.05%) and enter the lowest product. The remaining minerals in the table fan are located normally, and after the ascent, the sulphide concentration in specific gravities proceeds much more efficiently.

During agitation, the reagents are given in the following order:

1. Technical sulfuric acid - 2-4 kg / t; agitation - 1-2 minutes

2. Xanthate - 0.2-0.4 kg / t; agitation - 1-2 minutes

3. Kerosene - 1-2 kg / t; agitation - 4 - b min.

The role of sulfuric acid and xanthate in this case is the same as in froth flotation, and is easily explained from the point of view of the chemical theory of flotation.

In the presence of xanthan gum, floatable pulp forms a poorly soluble iron xanthate compound (copper xanthate), which is chemically fixed on the surface of pyrite grains (chalcopyrite), due to which the pyrite grains (chalcopyrite) become hydrophobic and easily covered with a kerosene film.

The grains of sulphides covered with kerosene film completely freely float onto the surface of the ®odes; at the same time, what. the thinner the layer of water, the fuller is the ascent of sulphides.

Flotation on the table of large grains of sulphides is possible only when all three of the above-mentioned rEagents are used; without kerosene, with one xanthate, the ascent of sulfides is not reached, nor does sulfide occur with kerosene, but without xanthate.

The proposed method is very different from the foam and oil. The results of refining tungsten middlings by the proposed method.

flotation by the fact that the removal of sulfides and the surface of the water does not require air bubbles (as in peat flotation) or oil balls (as in oil flotation). However, in order to ascend large grains of sulphides processed by the above mentioned method, certain benefits are needed, namely:

1) the separating medium should consist of a thin layer of water (2-4 mm),

2) mechanical shaking of the material.

Concentration tables are the most suitable apparatus for the implementation of the proposed method.

The method is characterized by the fact that the results are the higher, the larger (up to 4 mm) the starting material.

Thus, with the introduction of this method, the most unpleasant and expensive operations — crushing and roasting of large classes — are completely eliminated. It should be emphasized that using this method on concentration tables, two main processes are carried out simultaneously: flotation of large sulphides and concentration of other minerals by specific gravity, which reduces the number of D01 vodochnyh operations — one operation (simultaneously flotation and table concentration) instead of four operations (classification, grinding, flotation and concentration).

From the point of view of the extraction of tungsten, the proposed method gives very good results (see table).

on an industrial scale Continued