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Electrochemical dissolving method for noble metal

A precious metal, electrochemical technology, applied in chemical instruments and methods, dissolution, dissolution, etc., can solve the problems of large consumption of hydrochloric acid and nitric acid, pollute the environment, time-consuming, etc., achieve reduced impurity content, low consumption of hydrochloric acid, and high purity Effect

Inactive Publication Date: 2005-02-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: ①The prepared chloroplatinic acid aqueous solution contains NO 3 - ions; ② the dissolution rate of metal Pt is slow and time-consuming; ③ the consumption of hydrochloric acid and nitric acid is large; and ④ a large amount of NOx gas is produced, polluting the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take a platinum sheet with a thickness of 0.5-1mm, cut it into 125mm×30mm (weight 20g) as an electrode, put it into a beaker filled with 200ml 12NHCl to form an electrolytic cell. An alternating current of 6.5 volts and 25 A was applied to the electrolytic cell. After passing through the current, pass cooling water around the beaker to control the temperature of the electrolytic cell at 25°C. A large number of tiny bubbles are generated on the electrode surface, and the color of hydrochloric acid gradually turns yellow, from light to dark. After 3 hours, the platinum electrode was taken out, washed, dried, and weighed. A total of 9.72 grams of platinum was dissolved. The dissolution rate of platinum is 0.060 g Pt / cm 2 .Hour.

Embodiment 2

[0031] Replace the beaker with a φ15mm U-shaped tube, apply an alternating current of 60 volts and 4.6 amps to the electrolytic cell, and stop the reaction after 3 hours. The dissolution rate of platinum is 0.0015g Pt / cm 2 .Hour.

Embodiment 3-6

[0033] Except changing the concentration of hydrochloric acid, other conditions are the same as in Example 1, and the test results are listed in Table 1.

[0034] Hydrochloric acid concentration

[0035] The results in Table 1 show that the higher the concentration of hydrochloric acid, the higher the dissolution rate of metal Pt.

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PUM

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Abstract

The invention discloses an approach of electrochemically dissolving noble metal. Its characters are: 1. make noble metal as electrodes; 2. put the electrodes into electrolytic cell with concentrated acid; 3. load AC of 10-100Hz, 2-100V, 0.01-5 A / CM2 to solve the noble metal and get acid solution. Highly pure chloroplatinic acid solution without NO3 ion can be produced in terms of the invention. The approach has a simple operation, low muriatic acid consumption and no NOx pollution.

Description

technical field [0001] The invention relates to a method for dissolving noble metal to prepare its aqueous solution. More specifically, the present invention relates to a method for directly dissolving noble metal platinum to prepare its acid solution through electrochemical action. Background technique [0002] Aqueous acid solutions of noble metals such as platinum and palladium are the starting materials for the synthesis of various compounds containing noble metals such as platinum and palladium and the preparation of catalyst loading solutions. It is widely used in petrochemical, pharmaceutical, fine chemical, organic synthesis and other fields. At present, the methods for dissolving precious metals such as platinum to prepare chloroplatinic acid solution all adopt the aqua regia method. That is to add platinum flakes or platinum sponge to the newly prepared aqua regia (concentrated hydrochloric acid: nitric acid = 1:3) solution, after the platinum is completely disso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01F1/00
Inventor 吕顺丰秦燕璜
Owner CHINA PETROLEUM & CHEM CORP
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