Efficient activating and dissolving method of rhodium powder

Abstract

The invention discloses an efficient activating and dissolving method of rhodium powder. The rhodium powder and a hydrochloric acid solution are mixed in a certain ratio, the mixed solution is put ina reactor, a certain amount of activator gold powder is introduced, temperature is controlled at 60-112 DEG C, Cl2 is introduced and subjected to a reaction for 1-3 h, Cl2 is recycled in a dissolvingprocess, heat preservation is performed at a certain temperature for 10-90 min after Cl2 introduction is ended, the mixed solution is cooled to normal temperature and then is filtered, and a chlororhodic acid solution with purity higher than 99.95% and Rh content higher than 15% is obtained. The dissolution rate of rhodium is higher than 96%, Cl2 is recycled in the dissolving process, and the method has the characteristics that environmental protection property is good, the technological process is short, dissolving efficiency and dissolution rate are high, no new impurities are introduced basically, the obtained chlororhodic acid solution has high Rh content and high purity and the production cost is low.

Description

technical field [0001] The invention belongs to the field of metallurgy of non-ferrous metals, in particular to an efficient activation and dissolution method of rhodium powder, and is also applicable to the dissolution of rhodium secondary resource materials. Background technique [0002] The dissolving of known rhodium material has following several methods: [0003] Medium-temperature chlorination: Mix sodium chloride and rhodium-containing materials in proportion, and feed Cl at 600°C to 700°C 2 dissolve. This method is easy to realize industrialized production, but the dissolving cycle is long, the treatment volume at one time is small, the dissolving rate at one time is low, multiple times of dissolving are required, the equipment is difficult to seal, and the operating environment is relatively bad. [0004] Alkali fusion: Sodium hydroxide (barium hydroxide), sodium peroxide and rhodium-containing materials are mixed in a certain proportion and melted at high temper...

AI Technical Summary

Problems solved by technology

This type of method is activated to improve the solubility of rhodium, but there is a long cycle, the introduction of impurity elements, and the generation of hydrogen under acidic conditions have certain safety hazards.

[0021] The above method may have problems such as poor operating environment, long dissolution cycle, low primary dissolution rate, low dissolution efficiency, high equipment requirements, small processing capacity, and the introduction of impurities.