SU58582A1 - Gold deposition method - Google Patents

Description

In the practice of the cyanide gold recovery process, the deposition operation from solutions is currently performed solely by the action of a precipitant on the filtered cyanide solution.

This necessitates a reduction in the precipitation, in order to separate the solutions from the solid part of the pulp, filtration, before which the pulp is usually thickened. As a result of this, the cost of processing a whole lot is increased, since filtering is a rather expensive operation, and the ycTaHOiBKa filters require significant capital expenditures. Most of the thickeners are very bulky, KOTOpbie occupy a large area and require an increase in capital expenditures on the construction of the factory building.

In addition, the currently used methods for precipitating gold from solution require equipment rather complex (Merrill-Crouch apparatuses for deposition of zinc dust) or thunder (extractors for deposition of zinc chips). It is necessary to note also that when

In these operations, zinc is consumed in a significant excess.

One attempt to avoid the negative aspects of zinc precipitation from filtered solutions was the proposal by Gross and Scott, patented by Edquist in 1934, to precipitate ash from the pulp with the introduction of charcoal, which was then separated by flotation in the form of coal-containing gold concentrate. . When implemented; This proposal should complement the cyanide process with special flotation equipment. In addition, it is necessary to process not a rich cyanide, but a rather significant amount of coal concentrate.

All these circumstances (as well as others) make it difficult to implement precipitation directly from pulp on coal.

The method of the present invention also relates to methods for precipitating gold directly from pulp after leaching gold-bearing ores with cyanic solutions, but differs from them in that zinc amalgam is used to precipitate gold. In this way.

at the same time with the precipitation of the product and the amalgamation of the precipitated gold.

The proposed method can be applied to obtain complete or partial precipitation from cyanide solution. In the case of complete gold precipitation, an expensive filtration operation and a bulky thickening operation can be eliminated. In addition, the zinc contained in the amalgam will not undergo the oxidation that occurs, for example, in extractors, and this eliminates the need for deoxygenation, which is carried out before precipitation with zinc dust. The treatment of amalgam obtained after precipitation of gold with calcium amalgam is much simpler than the treatment of cyanide schlamas.

In the case of a partial application of the proposed method, the precipitation of zinc amalgam directly from the pulp can be used to shredder the gold content in pacTBiopax, which then goes into further processing, filtration and precipitation of gold using the usual method.

K-ak is known, with a significant content of gold in solutions, in order to avoid metal losses in the tails, repeated filtration with intermediate cake repulping is used. The cost of pre-precipitation with zinc amalgam is significantly lower than the cost of the second filtration stage. In addition, the task of subsequent precipitation from solutions is simplified. Such plants can be placed in a number of factory points in order to regulate the content in solutions and to speed up the sale of the metal.

Experiments have shown the full possibility of carrying out the method of direct deposition of dissolved gold from pulp with zinc amalgam.

The hardware design of this method can be done differently, depending on the goals. The constructions of well-known amalgamators, such as Pierce, Hoyt, and Gibson, can be used as precipitators, and in some cases it will be necessary to install a mechanical agitator with amalgamated sheets suspended in it. For some. In some cases, sluices can also be used, but certainly with well developed traps.

The subject matter of the invention.

The method of deposition of gold directly on pulp after leaching of gold-containing - y-d cyan solutions, about tl HI h & This is because zinc amalgam is used to precipitate gold.