Quick dissolution method for high-purity rhodium material

Abstract

The invention discloses a method for quickly dissolving a high-purity rhodium material. A precious metal insoluble rhodium material is mixed with an acid liquid and an oxidant according to a certain proportion and then placed into a customized pressure container, the temperature is controlled to between 160 and 300 DEG C, the oxygen partial pressure is between 0 and 3.0MPa, the reaction time is between 1 and 8 hours, the precious metal rhodium material is quickly dissolved under high temperature and high pressure to produce an acid rhodium solution, the dissolution ratio is more than 98 percent, and the yield is more than 99 percent. The method has the advantages of short flow, short production period, high dissolution efficiency, environmental protection, high yield, low cost, energy conservation and so on, has important popularization value in precious metal industry refining and compound production fields, can reduce the dispersion of precious metal, shorten production period, reduce capital overstocking, and reduce the risk caused by the price fluctuation of the precious metal.

Description

technical field [0001] The invention belongs to the field of nonferrous metal metallurgy. In particular, it relates to a method for dissolving high-purity precious metals and preparing an aqueous solution thereof. Background technique [0002] In the known process of purifying precious metal rhodium and its compounds, its dissolution has the following methods: [0003] 1. Medium-temperature chlorination: chlorinate sodium chloride and rhodium-containing materials in proportion at 650°C to 700°C, and then dissolve. Advantages: Chlorination equipment is easy to solve and easy to mass produce. Disadvantages: long cycle, high return rate and low chlorination efficiency. [0004] 2. Alkali fusion: Raise the temperature of sodium peroxide and rhodium-containing materials in a muffle furnace to 550°C in proportion to melt, and then dissolve. Advantages: higher dissolution efficiency. Disadvantages: long cycle, high energy consumption, mass production and equipment materials ar...

AI Technical Summary

Problems solved by technology

Disadvantages: long cycle, many returning materials, low chlorination efficiency

Disadvantages: long cycle, high energy consumption, mass production and equipment materials are not easy to solve, sodium hydroxide is easy to introduce trace impurities

Disadvantages: long cycle, high energy consumption, and the dissolution of pure rhodium powder will introduce new impurities, which are not easy to remove

Disadvantages: long cycle, high energy consumption, and the introduction of sulfate and sodium ions have a certain impact on the product

[0011] The above methods basically use salts and oxidants to dissolve refractory metals, and all of them have disadvantages such as long production cycle, low dissolution efficiency and weak ability to resist the risk of price fluctuations of precious metals.