SU889101A1 - Method of retreating of cheelite concentrate - Google Patents

Description

(54) METHOD OF ARRANGEMENT OF NECKLINE CONCENTRATE

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This invention relates to the beneficiation of minerals, in particular to the processing of scheelite ores.

Most of the scheelite enrichment plants use leaching with hydrochloric acid to remove phosphate phosphoric acid concentrates from the neck.

This operation is effective, but it is expensive and causes great difficulties in circulating water supply.

A known method of depression of apatite in the flotation of phosphoric ores, which consists in the use of silicofluoride Na 2.

However, with the enrichment of scheelite ores, the use of sodium silicofluoride is not sufficiently effective because of the need to float in alkaline pulps and the additional complication of the scheme in connection with the purification of the tail pulp from fluoride ions.

In industrial factories that process scheelite ores, the main method of finishing rough scheelite concentrates is the method of steaming them with liquid glass (with a density of about 55% solid, using the Petrov method) and scheelite flotation. The high-temperature treatment of the rough concentrate with liquid glass allows the bulk of quartz, aluminosilicates, calcite, and fluorite to be depressed.

ten

As a result of this treatment, during subsequent flotation, sheelite concentrates are obtained with a content of ipexoKHCH tungsten and most admixtures, which are responsible for the requirements of GOST. One of the most important impurities that does not fit into the framework of the existing requirements is the phosphorus content.

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The aim of the invention is to improve the quality of scheelite concentrate, namely, the reduction of phosphorus in scheelite concentrate.

Delivered, the chain is achieved in that the phosphoric acid salt is introduced by steaming the scheelite concentrate.

The method is carried out as follows.

The rough concentrate is thickened, heated to 90 ° C, hard glass is added to it and mixed. Then the salt of phosphoric acid is introduced, stirred again. After mixing is completed, the slurry is cooled, diluted with water, and scheelite is floated.

Example. The rough scheelite concentrate obtained in the main scheelite flotation cycle is thickened to T: W 1: 1, heated to EOS in a water bath, water glass is added 29.5 kg / ton of product and agitated for 15 minutes at 85-90 s, then A trisodium phosphate solution of 1.94 kg / ton of product is added to the pulp and agitated for an additional 45 minutes at the same temperature. At the end of the agitation, the pulp is cooled, diluted with water to T: W -1: 3 and floated with one mop-up and control flotation at 23 ° C. The result is scheelite concentrate content. phosphorus 0.16%.

In experiments with steaming without trisodium phosphate, sheelite concentrate with a phosphorus content of 1.33% is obtained.

To verify the need for phosphorus salt in the steaming conducted experiments

with a dosage of trisodium phosphate in the cleaning of the rough concentrate. These experiments showed low efficiency And did not significantly reduce the phosphorus content.

The technical and economic efficiency of the invention lies in the fact that the introduction of phosphate into steaming leads to a sharp decrease in the phosphorus content in the final Scheelite concentrate with virtually no loss of scheelite.

Claims (2)

Invention Formula The method of finishing the scheelite concentrate, which consists in steaming the concentrate with liquid glass and scheelite flotation, characterized in that, in order to improve the quality of the scheelite concentrate, the phosphoric acid salt is introduced into the steaming. Sources of information taken into account in the examination 1, Bogdanov OS and. Questions of the theory and technology of flotation. L., Proceedings of the Institute Mekhanobr, vol. 124, p. 336 .. 2.Dudenkov S.V. et al. Main theories and practice of using flotation reagents. M., Nedra, 1969, with. 341 (prototype).