Electrochemical dissolving method for iridium powder

An electrochemical and electrolytic cell technology, applied in chemical instruments and methods, inorganic chemistry, ruthenium/rhodium/palladium/osmium/iridium/platinum compounds, etc., can solve the problem of low purity of iridium-containing compounds, increased preparation steps, and increased iridium Loss and other problems, to avoid impurity interference, high product purity, low preparation cost

Active Publication Date: 2012-04-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the high price of iridium, the dissolution process must reduce the loss of iridium as far as possible, and in order to remove other ions introduced, the preparation steps will be increased to increase the loss of iridium, so the iridium-containing compound prepared by the above-mentioned existing method has a relatively high purity. Low

Method used

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  • Electrochemical dissolving method for iridium powder
  • Electrochemical dissolving method for iridium powder
  • Electrochemical dissolving method for iridium powder

Examples

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preparation example Construction

[0058] In the preparation step of the present invention, except for the impurities contained in the hydrochloric acid solution and the iridium powder two raw materials, no new impurity ions are added or generated. Therefore the present invention can be used for the preparation of high-purity chloroiridic acid aqueous solution, but this method does not limit this method to be used for low-purity iridium powder and hydrochloric acid dissolving to prepare low-purity chloroiridic acid aqueous solution. For example, the method of preparing low-purity chloroiridic acid aqueous solution by electrolysis of low-purity iridium powder and hydrochloric acid dissolution may be used in the recovery and purification process of iridium powder and iridium trichloride hydrate.

[0059] The present invention utilizes the principle of alternating current dissolution to directly dissolve iridium powder in hydrochloric acid to obtain an aqueous solution of chloroiridic acid, and the electrochemical ...

Embodiment 1

[0094] figure 1 is a schematic diagram of a U-shaped electrolytic cell. The diameter of U-shaped quartz electrolytic cell 1 is 50mm for the standpipe 1b, and the distance between the centers of the two standpipes is 180mm; the diameter of the bottom bend 1a is 18mm, and the diameter of the standpipe: the diameter of the bend=2.78; The length is 25mm; the volume of the electrolytic cell is 800ml. The electrode 2 uses Φ12mm and a length of 250mm for spectroscopically pure graphite electrodes. A cold water condenser is installed on both sides of the U-shaped quartz electrolytic cell 1 through the condenser interface 1c.

[0095] Iridium powder dissolving device see figure 2 , wherein: the two ends of the graphite electrode are connected to the AC arc generation controller 3, the iridium powder 5 is placed in the bottom elbow 1a of the U-shaped electrolytic cell, and the hydrochloric acid solution 4 is added to the electrolytic cell 1 and placed in the circulating cooling water...

Embodiment 2、3

[0098] Change the voltage of the electrolytic alternating current to 45 volts and 55 volts respectively, and the magnitude of the current varies from 10 to 40 amps. Other conditions are as shown in Example 1. The dissolution rates of iridium powder were 89% and 85% respectively.

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Abstract

The invention relates to an electrochemical dissolving method for iridium powder, which is comprises the following steps: adding a hydrochloric acid solution and iridium powder in a U-shaped electrolytic bath, loading the alternating current at two ends of electrode of the U-shaped electrolytic bath, directly dissolving iridium powder in hydrochloric acid to obtain a chloro-iridic acid aqueous solution; filtering the chloro-iridic acid aqueous solution, then distilling to obtain a chloro-iridic acid concentrate. The electrochemical dissolving method for iridium powder is characterized in that the raw material iridium powder is directly dissolved in hydrochloric acid without adding any other reagents, the impurities interference can be avoided when the high purity iridium powder is taken as a raw material, so that the high purity chloro-iridic acid H3IrCl6 aqueous solution is prepared.

Description

technical field [0001] The invention relates to a dissolving method of iridium powder, in particular to an electrochemical dissolving method of iridium powder. In particular, it refers to the method of directly dissolving metal iridium powder into hydrochloric acid to obtain an aqueous solution of chloroiridic acid. Background technique [0002] Iridium is a very malleable silver-white precious metal with a melting point of 2410±40°C. The density is 22.42 g / cm3. The melting point is 2410°C and the boiling point is 4130°C. face centered cubic crystal. Usually, the form of commercial iridium is powder, namely iridium powder. At present, its domestic market price is 100,000 to 300,000 yuan / kg. [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. For exampl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G55/00
Inventor 吕顺丰王世亮李彤刘博秦燕璜
Owner CHINA PETROLEUM & CHEM CORP
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