The method of extraction of precious and non-ferrous metals from secondary raw materials

 

(57) Abstract:

The invention can be used to extract non-ferrous and precious metals from secondary raw materials, in particular electronic scrap (chips in the plastic shell, thyristors, and so on). To simplify the process and increase the degree of extraction of non-ferrous and precious metals from secondary raw materials the selection of non-ferrous metals is carried out by processing of secondary raw materials with a mixture of sulfuric and nitric acids, as for the selection of precious metals (gold) in the leaching solution is injected organic collector - varnish Capon, which absorb (absorbs) gold gel product and separates it from the leach slurries. table 2.

The invention relates to the field of hydrometallurgy of precious and non-ferrous metals and can be used in the processing of recyclable materials, including electronic scrap (chips in plastic cases, thyristors, connectors, contacts).

There is a method of recovery of precious and non-ferrous metals, taken as a prototype of scrap electronic devices [1], involving the leaching of scrap 30-60% nitric acid with stirring until the copper content in the solution > 150 altrua, handle H2SO4concentration of > 400 g/l for crystallization of sulfates, dissolved metals, which are then leached with water.

The precipitate, containing Au, tin acid and PbSO4, washed, dried and melted with Na2CO3to obtain Korolkov Au.

From aqueous sulfate solution by cementation on copper precipitated Ag and Pd, which are then separated by known methods. From the solution after their deposition by electrolysis to extract copper. The spent electrolyte and prambody evaporated in vacuum and return to the cycle.

The disadvantage of the process is the low gold recovery, inability to obtain pure metallic gold, and a large number of located and solutions that need was evaporated to significantly increase energy consumption.

The technical result, for which the applicant seeks, the present invention is intensification and simplification of the processing of electronic scrap, improve recovery and quality of gold, base metals, reduction of power consumption.

The technical result is achieved by conducting the method of extraction of precious and non-ferrous metals from secondary raw materials, clustering gold-bearing sediment, while the leaching of non-ferrous metals carried out with a mixture of sulfuric and nitric acids containing 530-550 g/l of sulfuric acid and 350-400 g/l nitric acid, and after leaching, the slurry is injected organic collector - varnish Capon in the amount of 3-4 g per 1 g of gold for education in the pulp of gel product, sorbing gold, pop up to the surface and separating it from the solution and pulp.

Gold gel product contains Au=16-21%, Ag < 0,001%, Cu+Ni+Fe < 0.1% of dried and then melted in an induction furnace with production of metal alloy containing up to 30% gold, or dissolved in tsarskovodochnom solution followed by precipitation of solid gold hydrazine sulfate with obtaining metallic gold, containing > 99.7% of the basic substance.

Below are examples of the implementation of the proposed process (PL. 1,2).

As shown in table. 1 results of applications as solvents nitric and sulphuric acids is not possible to achieve 100% recovery of non-ferrous metals from the concentrate in the solution. And only use the mixture of acids the concentration of nitric acid is not less than 350 g/l and sulfuric 530 g/l allows for t: W = 1: 6, the temperature of the pulp at least +80

When carrying out the leaching of non-ferrous metals in the pulp leaching appear small flakes of metal gold, which when filtering the pulp remains in the insoluble precipitate, and some gold (3%) lost to leaching waters. Further extraction of gold from the insoluble sludge is usually done by melting with the receipt of an alloy containing from 5 to 12% of gold, and slag containing up to 1% of gold, or by tsarskovodochnom dissolution of gold from the insoluble precipitate, followed by the deposition of metallic gold from tsarskovodochnom solution to obtaining gold, containing 99.7% of the basic substance, and the insoluble precipitate (II) containing 0.5% gold.

To increase the recovery of metallic gold from the pulp leaching the leaching solution is introduced organic matter - collectors (lacquer type "Capon"), which contribute to the formation of in-pulp leaching gel product absorption (absorbing) on the surface of the metal flakes of gold.

This gel-like product easier slurries leaching, so he POPs up and is easily separated from the main pulp.

As follows from the results given in table. 2,completely automatic to extract gold in a gel-like product, containing from 16.5 to 20.4% of gold. Melting of this product allows you to obtain an alloy containing up to 30% of the gold, and when tsarskovodochnom dissolution and subsequent precipitation of hydrazine obtained gold, containing 99.9% of the basic substance removing not less than 90%.

The method of extraction of precious and non-ferrous metals from secondary raw materials, including acid leaching of non-ferrous metals processing solutions leaching and smelting insoluble gold-bearing sludge, characterized in that the leaching of non-ferrous metals carried out with a mixture of sulfuric and nitric acids containing 530-550 g/l of sulfuric acid and 350-400 g/l nitric acid, and after leaching, the slurry is injected organic collector - varnish Capon in the amount of 3-4 g per 1 g of gold for education in the pulp of gel product, sorbing gold, pop up to the surface and separating it from the solution and slurry.

 

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