SU1565910A1 - Method of processing material containing bismut and lead in oxidized form - Google Patents

Abstract

The invention relates to non-ferrous metallurgy and can be used to process oxidized bismuth-and-lead-containing materials. The purpose of the invention is to increase the frequency of the bismuth product and lead extraction. The initial oxidized material is leached with a solution of sulfuric acid containing sulfate ions in the amount of 140–200% of the stoichiometrically necessary for the formation of lead sulfate and chlorine ions in the amount of 240-300% of the stoichiometrically necessary for the formation of bismuth chloride complexes at 50-75 ° C, the solid residue is washed with a working solution, after which the solution is separated from the solid residue and bismuth is precipitated from it when diluted with water at a ratio of 1: (0.4–0.8) and neutralized to a pH of 1.3–1.5. 1 hp f-ly, 2 tab.

Description

This invention relates to non-ferrous metallurgy and can be used to process oxidized bismuth and lead containing materials.

The aim of the invention is to increase the purity of the bismuth product and increase the recovery of lead.

Example 1 (by a known method). Bismuth-lead sublimates of smelting bismuth concentrate in a liquid bath containing 15% bismuth and 14.2% lead are leached with a solution with a HaS04 concentration of 80 g / l and NaCl 150 g / l at a T: W ratio of 1: 5 and a temperature of 9b ° C and duration 5 and 0.5 hours. The cake washing is carried out with the same type of solution. 97.9 and 97.8% bismuth and 22.0 and 21.7% lead, respectively, are transferred to the solution.

Bismuth oxychloride precipitate was separated from the leaching solution, combined with the water after ten-fold dilution with water by neutralization to pH 2. Removing bismuth in the sediment 99%. The composition of the sediment,%: bismuth 72.2; lead 1.9; iron

Example 2 (the proposed method). Sublimates of a composition analogous to example 1 are leached with a solution containing sulfate ions, introduced as sulfuric acid, in an amount of 150% of the stoichiometrically necessary for the formation of lead sulfate and chlorine ions, added as sodium chloride, in an amount of 280% of the stoichiometrically necessary the formation of bismuth chloride complexes, at 75 ° C for 0.5 h. Extraction of Wissl

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315

muta in a solution of 97.8%, and lead 5%. The cake is washed with a solution containing 6 g / l of sulfuric acid and 65 g / l of chlorine (the content of chlorine ion in the working solution after precipitation of bismuth by hydrolysis).

Bismuth is precipitated from the leaching solution, combined with the aqueous solution upon dilution with a ratio of 1: 0.5 and neutralization with sodium carbonate solution to a pI of 1.5. Removing bismuth in the sediment 99% "Obtained precipitate of bismuth oxychloride containing,%: bismuth 75; lead 0.6; iron 1.2.

The results of the leaching of bismuth-C8INC material are given in table. one.

The results of hydrolytic precipitation of bismuth are given in Table. 2

As can be seen from the table. 1, when leaching sublimates by a known method, 21.7-22% of lead goes into solution along with bismuth.

When leaching sublimates by the proposed method, high recovery of bismuth in the solution is maintained, and lead almost completely remains in the leaching cake. In composition, the leach cake is a marketable product, (lead cake), and is processed at a lead plant.

When sulfate ion is introduced into the leaching solution in an amount of less than kO% of the stoichiometrically necessary for the formation of lead sulfate, the degree of lead dissolution increases. Addition of the sulfate ion to more than 200% of the stoichiometrically necessary for the formation of bismuth chloride complexes negatively affects the recovery of bismuth . When the amount of chlorion in the solution is more than 300% of the stoichiometrically required formation of bismuth chloride complexes, the degree of dissolution increases

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35 40 45

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lead. As the temperature rises to C, the recovery of bismuth decreases and the degree of lead dissolution increases.

From tab. 2, it can be seen that, without diluting the solutions with water, the bismuth precipitation is slightly lower, and the impurity content is higher in the resulting precipitate compared to the results obtained upon dilution with water under the proposed conditions.

In comparison with the known method, the proposed method allows to increase the purity of the obtained bismuth product, increase the extraction of lead into the cake and isolate it as an independent product - lead cake, reduce reagent consumption and energy consumption for processing the source material.

Claims (2)

1. A method for processing a material containing bismuth and lead in an oxidized form, including leaching with a sulphate solution in the presence of chlorine ions, washing the solid residue with a working solution, separating the solution from the solid residue and hydrolyzing the bismuth from it, characterized in that in order to increase the purity of the bismuth product and increase the extraction of lead, leaching is carried out with a solution of sulfuric acid containing sulfate ions in an amount of 10–200% of the stoichiometrically necessary for the formation of lead sulfate and chlorine ions in an amount of 20–300% of the stoichiometric required on the formation of bismuth chloride complexes, and the precipitation of bismuth from the solution is carried out upon dilution with water to a ratio of 1: (0.4-0.8) and neutralization to a pH of 1.3-1.5. 2. A method according to claim 1, characterized in that the leaching is carried out at 50-75 ° C. 595 150 150 150 150 150 180 180 180 180 180 200 200 200 200 140 130 130 150 150 187 111 370 370 90 150 .150 150 150 Sublimates with a content of 6.4% Bi and 12.7% PL part of sz  Removing lead in solution  The deposition of the solution composition, g / l: Bi 24,5; Pb 5.2; Fe 12,7, obtained by leaching in a known manner.  The deposition of the solution composition, g / l: Bi 29,5; Pb 1.2; Fe 12.2; . 12 obtained by leaching the proposed method.