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Continuous electrochemical dissolving method for rhodium powder

An electrochemical and rhodium powder technology, applied in the field of dissolving rhodium powder, can solve the problems of reduced purity of rhodium trichloride, complex process, low yield of rhodium, etc., and achieve the effect of simplified operation, high product purity, and continuous feeding and discharging

Inactive Publication Date: 2018-12-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The above-mentioned various methods for dissolving rhodium have low rhodium yield, complex process, large loss of rhodium in the washing process, and residual K + or Na + Impurity ions reduce the purity of rhodium trichloride and other shortcomings

Method used

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  • Continuous electrochemical dissolving method for rhodium powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] (1) Set up the electrolytic cell. The electrolytic cell has three groups of cells and six electrode chambers. The upper cross section of the cell body is rectangular in size 150mm×50mm and 300mm in height; the bottom of the two electrode chambers of the same cell body is a semicircle In the same way, there is a gap of 20mm from the top of the second partition; the overflow hole is opened at a position 50mm from the top, with a diameter of 10mm; a cylindrical graphite electrode with a spectral grade of Φ12mm and a length of 300mm is selected, a total of 12, fixed on the top cover, X, The distance between the Y electrodes is 100mm.

[0058] (2) 1200 grams of rhodium powder with a purity of 99.95% are evenly added to the bottom of the electrolytic cell, and the superior grade pure hydrochloric acid of 8mol / l is added from the feeding port until all tank bodies are filled; The end is loaded with 60 volts of civilian AC, and the AC current is between 10 and 30 amperes; pay a...

Embodiment 2

[0060] (1) Set up the electrolytic cell. The electrolytic cell has three groups of cells and six electrode chambers. The upper cross-section of the cell body is rectangular in size 160mm×45mm and 230mm in height; the bottom of the two electrode chambers of the same cell body is a semicircular arc In the same way, there is a gap of 20mm from the top of the second partition; the overflow hole is opened at a position of 30mm from the top, with a diameter of 10mm; a cylindrical graphite electrode with a spectral grade of Φ12mm and a length of 300mm is selected, a total of 12, fixed on the top cover, X, The distance between the Y electrodes is 100mm.

[0061] (2) 1200 grams of rhodium powder with a purity of 99.95% are evenly added to the bottom of the electrolytic cell, and the superior grade pure hydrochloric acid of 10mol / l is added from the feeding port until all tank bodies are filled; The terminal is loaded with 50 volts of civilian alternating current, and the alternating cu...

Embodiment 3

[0063] (1) Set up the electrolytic cell. The electrolytic cell has three groups of cells and six electrode chambers. The upper cross-section of the cell body is rectangular in size 140mm×50mm and 320mm in height; the bottom of the two electrode chambers of the same cell body is a semicircular arc In the same way, there is a gap of 20mm from the top of the second partition; the overflow hole is opened at a position of 70mm from the top, with a diameter of 10mm; a cylindrical graphite electrode with a spectral grade of Φ10mm and a length of 300mm is selected, a total of 12, fixed on the top cover, X, The distance between the Y electrodes is 100mm.

[0064] (2) 1200 grams of rhodium powder with a purity of 99.95% are evenly added to the bottom of the electrolytic cell, and the superior grade pure hydrochloric acid of 8mol / l is added from the feeding port until all tank bodies are filled; The terminal is loaded with 70 volts of civilian alternating current, and the alternating cur...

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Abstract

The invention discloses a continuous electrochemical dissolving method for rhodium powder. The continuous electrochemical dissolving method comprises: 1, arranging an electrolytic cell, wherein the electrolytic cell is divided into at least two tank bodies by a first separation plate arranged in the electrolytic cell, the first separation plate is provided with an overflow hole, the tank body is divided into two electrode chambers by a second separation plate arranged in the tank body, the bottom portions of the two electrode chambers are communicated, and electrodes are respectively arrangedin the two electrode chambers; and 2, adding rhodium powder to the bottom portion of the tank body, adding a hydrochloric acid solution, applying voltage on the electrode, and carrying out continuously electrolysis treatment on the rhodium powder to dissolve. According to the present invention, the preparation method is simple and advanced; with the electrolytic cell provided with the plural groups of the tank bodies, a large amount of rhodium powder can be continuously dissolved; and by supplementing hydrochloric acid and rhodium powder, the continuous dissolving is achieved, and the automation degree is high.

Description

technical field [0001] The invention relates to a method for dissolving rhodium powder, in particular to a technology for continuously dissolving rhodium powder in hydrochloric acid by an electrochemical method, and belongs to the field of dissolving rhodium powder. Background technique [0002] Rhodium is a fairly malleable silver-white precious metal with a melting point of 1960°C. Usually, the form of commercial rhodium is powder, namely rhodium powder. At present, its domestic market price is 300,000 to 2,000,000 yuan / kg. The key step in the preparation of rhodium trichloride hydrate and other rhodium compounds is to dissolve rhodium powder in an aqueous solution. However, rhodium is the metal with the best chemical stability among the platinum group metals, and it cannot be directly dissolved in various common acid solutions such as hydrochloric acid, sulfuric acid, nitric acid and hot aqua regia. The general method for dissolving rhodium to prepare rhodium trichlori...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/26
CPCC25B1/26
Inventor 王世亮吕顺丰张明森李彤秦燕璜
Owner CHINA PETROLEUM & CHEM CORP
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