SU537032A1 - The method of obtaining solutions of bismuth salts - Google Patents

Description

Invention; relates to the field of bismuth hydrometallurgy.

A known method of producing bismuth salts by dissolving bismuth or its oxides in strong acids, for example in hydrochloric, followed by evaporation of the solution to dryness.

A known method for producing solutions of bismuth salts by anodic dissolution of metallic bismuth in a hydrofluoric hydrofluoric acid electrolyte. The electrolysis is carried out in an electrolysis cell with an ion-exchange membrane at a current of 15a to obtain solutions containing bismuth 50.7 g / l. Current output 93.6%.

The purpose of the invention is the preparation of concentrated solutions containing bismuth up to 200 g / l.

This is achieved by the fact that a solution of an acid, saturated with mercury ions by anodic dissolution of it, is reacted with bismuth amalgam.

Get solutions containing bismuth up to 20 g / l. The method can be carried out in an electrochemical cell, in which a solution of an acid saturated with mercury ions is first prepared by anodic dissolution thereof. Bismuth amalgam is injected into the resulting solution and is reacted with an acid solution saturated with mercury ions. The process of phase exchange of mercury ions with bismuth amalgam occurs, resulting in a concentrated solution of bismuth salt.

Example 1. In a temperature-controlled cell with a volume of 20 ml, 20 ml of metallic mercury, 150 ml of perchloric acid containing 400 g / l PS1O4 are placed. Mercury with the help of a platinum contact is connected with an anode; a titanium point electrode serves as a cathode. Electrolysis is carried out when moving the solution and mercury at a speed of 220 rpm, anodic current density of 0.0 / a / cm cathode current density of 4 a / cm and temperature. The yield of mercury ions in the solution is 60-75%. The saturation of the perchloric acid electrolyte with mercury ions leads to the formation of a solid phase (insoluble mercury perchlorate salt). Then, bismuth amalgam is introduced into the cell with the resulting solution of mercury perchlorate and the phase exchange reaction of ions is carried out

mercury with bismuth amalgam.

During the reaction, the concentration of mercury ions in the solution is reduced to 1-10- - 5-10-g / l, depending on the duration of the reaction. Bismuth concentration in

the electrolyte is 126 g / l.

Example 2. In the cell described in example 1, 20 ml of mercury and 150 ml of electrolyte containing 200 g / l of hydrochloric acid, 250 g / l of ammonium chloride are placed. Electrolysis

carried out with stirring of the solution and mercury at a speed of 220 rpm, anodic current density of 0.09 A / cm, a cathode of 5 A / cm and a temperature of 35 ° C. The yield of mercury ions in the current solution is 80-85%.

Then, a bismuth amalgam is introduced into a cell with "insoluble mercury chloride," and the phase exchange reaction with bismuth amalgam is carried out.

During the reaction, the concentration of mercury in the electrolyte decreases to L-5-10 g / l, depending on the time of re-.

pktsin. As a result of the experiment, the concentrations of bismuth in the electrolyte are 196 g / l.

Claims (1)

Invention Formula The method of obtaining the solutions of bismuth salts, characterized in that, in order to obtain concentrated solutions with a bismuth content of up to 200 g / l, an acid solution saturated with mercury ions by anodic dissolution thereof is subjected to interaction with bismuth amalgam.