Rapid dissolution method for indissolvable metal iridium

Abstract

The invention discloses a rapid dissolution method for indissolvable metal iridium. The method comprises the following steps: 1, adding iridium powder and hydrochloric acid into a reaction kettle, introducing a chlorine gas into the reaction kettle, and performing a reaction under certain reaction conditions; 2, after the reaction of the iridium powder, the hydrochloric acid and the chlorine gas is completed, reducing pressure of the reaction kettle to normal pressure, adding concentrated hydrochloric acid in batches, continuing a stirring reaction under the temperature condition of 70-90 DEGC for 1-5 h, removing a free chlorine gas in the reaction liquid, and performing cooling to room temperature; and 3, after the reaction system is cooled to the room temperature, performing solid-liquid separation, wherein the obtained filtrate is a chloroiridic acid solution. According to the method disclosed by the invention, a one-time dissolution leaching rate of the indissolvable metal iridiumpowder achieves 70% or more, and the dissolution method disclosed by the invention has the advantages of a simple process, a short process, a large processing amount and no introduction of impurity ions, and is a high-efficiency low-cost and environmentally-friendly method.

Description

technical field [0001] The invention belongs to the technical field of dissolving insoluble metals, and in particular relates to a method for quickly dissolving insoluble metal iridium. Background technique [0002] Iridium is a silver-white precious metal with considerable ductility, with a melting point of 2410±40°C, a boiling point of 4130°C, and a density of 22.42g / cm 3 , has extremely high corrosion resistance. Usually the form of commercial iridium is powder, namely iridium powder. [0003] Metal iridium is the initial raw material for synthesizing other iridium-containing compounds and preparing iridium-containing catalysts. Iridium-containing compounds and iridium-containing catalysts are widely used in petrochemical and organic synthesis fields. [0004] The key step in preparing iridium-containing compounds is to dissolve elemental iridium powder in aqueous solution. However, iridium is one of the most stable and corrosion-resistant metals in the platinum group...

AI Technical Summary

Problems solved by technology

This method has the following disadvantages: ①Introducing K + or Na + Impurity ions need to be further removed by appropriate methods, with long process, high cost, and large loss of iridium; ②The processing capacity of the tube furnace is small; ③The chlorination temperature is as high as 500°C-800°C, and the energy consumption is high; ④The conversion rate is low, and once Chlorination conversion rate is only about 50%

[0008] The main disadvantages of these two methods are: ①The amount of treatment at one time is small, which is not suitable for industrial production; ②The electrolysis process cannot be carried out in a sealed environment, and the volatilization of hydrogen chloride and the chlorine gas generated by the anode lead to extremely harsh operating environments.

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