SU548647A1 - Method of extracting bismuth on chloride-containing solutions - Google Patents

Description

one

This invention relates to the field of hydrometallurgy of non-ferrous metals, in particular, to methods for extracting bismuth from solutions by extraction.

A method is known for extracting bismuth from chloride-containing solutions by extraction with tributyl phosphate, followed by stripping with hydrochloric acid. According to a known method, extraction is carried out from 1 n. acid solutions, and reextraction are concentrated (8 and.) acid I.

However, this method is not applicable to the processing of industrial iron-containing bismuth solutions due to the impossibility of separating bismuth from iron.

The aim of the invention is the selectivity of the release of bismuth.

This is achieved in that the extraction is carried out from solutions with a concentration of chlorine ions of 0.1-0.8 g-ion / l, and the reextraction is carried out with a solution of hydrochloric acid containing 10-50 g / l of iron.

During extraction and reextraction, the ratio of the volumes of the organic phase to the aqueous phase is equal, respectively, 1: 1-50 and 1 - 10: 1.

The method is explained by the following examples.

Example 1. For the extraction of bismuth take 24 l of a solution containing, g / l: B1 -

1.2; Fe (II) - 11; Fe (III) - 7; C - 8; As (III) - 1; Zn - 0.4; . - five; Cl - - 13. Extraction is carried out with 100% tributyl phosphate (600 ml) at a ratio of

volumes of organic (O) and water (B) phases. After a fourfold extraction with a cross-current solution, the organic phase contains 46 g / l Bi. Reextraction of Bi and conducting 4 n. a solution of hydrochloric acid containing 32 g / l of iron with a phase ratio of 0: 1. The reextract with a Bi concentration of 45 g / l is subjected to electrolysis at a cathode current density of 150 L / m. The resulting bismuth powder contains impurities in

the following quantities, weight. %: Fe-10-10; Cu 10-3; 10-4.

Example 2. For the extraction of bismuth take 10 l of a solution containing, g / l: Bi - 10; Fe (P) - 8; Fe (III) - 4; C - 4;

As (III) - 0.5; Zn - 0.6; - 70; C1- - 7. Extraction is carried out with 100% tributyl phosphate (250 ml) with a phase ratio. After chetyrehkraty extraction with a cross-current solution, the organic phase contains 39 g / l Bi. After the stripping and electrolysis operations under the conditions described in Example 1, bismuth powder is obtained, the impurity content of which is, weight. %: Fe -

1 10-3; C 10-3; Zn 5-10-4.

Claims (2)

1. A method of extracting bismuth from chloride-containing solutions by extraction with tributyl phosphate followed by reextraction, characterized in that, for the purpose of selectivity of extraction, extraction is carried out from solutions with a chlorine ion concentration of 0.1-0.8 g-ion / l, and the reextraction is carried out with a solution hydrochloric acid containing 10-50 g / l of iron. 2. A method according to claim 1, characterized in that, during extraction and re-extraction, the ratio of the volumes of the organic phase to the aqueous phase is 1: 1 to 50 and 1 to 10: 1, respectively. Sources of information taken into account in the examination: I. Analytical Chem. V. 27. Vol. 6, 1972, p. 1207-1208.