Recovery method of fine catalyst metal obtained after electrolysis and purification of synthetic diamond powder

A technology of synthetic diamond and electrolytic purification, applied in the field of fine catalyst metal recovery after electrolytic purification of powder synthetic diamond, can solve the problems of noble metal corrosion of anode, high cost of equipment consumption of acid, high labor intensity of employees, etc., so as to avoid noble metal corrosion Serious phenomenon, avoid serious anode passivation, reduce labor intensity

Inactive Publication Date: 2012-11-14
ZHONGNAN DIAMOND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. Since the mixed material is in the form of discrete particles with a particle size of about 0.035 mm, in the electrolytic anode bag due to gravity compaction and small conductive specific surface area, the circulation of the electrolyte is blocked, the anode passivation is serious, and the precious metals that constitute the anode are severely corroded , which seriously affects the smooth progress of electrolytic purification
[0004] 2. Due to the rapid oxidation of the catalyst metal particles during the physical purification of the mixed material, it leads to poor electrical conductivity during the electrolysis process, and metal ion exchange obstacles, which seriously affect the electrolysis rate, and the cost of equipment, energy consumption, and acid consumption is high
At the same time, the side reactions (hydrogen evolution reaction, etc.) in the electrolysis process are serious, seriously deteriorating the workshop environment
[0005] 3. The traditional "secondary electrolysis" process method has low metal recovery rate, low power utilization rate, high labor intensity, labor and time-consuming

Method used

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  • Recovery method of fine catalyst metal obtained after electrolysis and purification of synthetic diamond powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. Divide 300Kg of the mixed material containing catalytic metal into 60 diaper bags, tie the mouth tightly and put it into the electrolytic cell;

[0032] 2. Inject 600Kg of hydrochloric acid with a mass concentration of 10% into the electrolytic cell, and the concentration of hydrochloric acid is kept constant through the flow meter;

[0033] 3. Use the electrolyte circulation to heat the acid solution through the pipeline to keep the temperature of the acid solution at 30°C;

[0034] 4. The reaction was carried out for 4 days, and the measured pH value was 1.12. The acid solution was pumped into the electrolytic cell for electrolytic recovery.

[0035] After physical and chemical analysis, the metal content in the good material bag was confirmed, and the measured metal content was only 9% of the original metal content, which proved that 91% of the metal had been dissolved into the acid solution.

Embodiment 2

[0037] 1. Divide 300Kg of the mixed material containing catalytic metal into 60 diaper bags, tie the mouth tightly and put it into the electrolytic cell;

[0038] 2. Inject 900Kg of hydrochloric acid with a mass concentration of 10% into the electrolytic cell, and the concentration of hydrochloric acid is kept constant through the flow meter;

[0039] 3. Use the electrolyte circulation to heat the acid solution through the pipeline to keep the temperature of the acid solution at 40°C;

[0040] 4. The reaction was carried out for 4 days, and the measured pH value was 1.12. The acid solution was pumped into the electrolytic cell for electrolytic recovery.

[0041] After physical and chemical analysis, the metal content in the good material bag was confirmed, and the measured metal content was only 8% of the original metal content, which proved that 92% of the metal had been dissolved into the acid solution.

Embodiment 3

[0043] 1. Divide 400Kg of mixed materials containing catalytic metals into 60 plastic bags, tie the mouth tightly and put them into the electrolytic cell;

[0044] 2. Inject 1600Kg of hydrochloric acid with a mass concentration of 15% into the electrolytic cell, and the concentration of hydrochloric acid is kept constant through the flow meter;

[0045] 3. Use the electrolyte circulation to heat the acid solution through the pipeline to keep the temperature of the acid solution at 50°C;

[0046] 4. The reaction was carried out for 3 days, and the measured pH value was 1.12. The acid solution was pumped into the electrolytic cell for electrolytic recovery.

[0047] After physical and chemical analysis, the metal content in the good material bag was confirmed, and the measured metal content was only 9% of the original metal content, which proved that 91% of the metal had been dissolved into the acid solution.

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Abstract

The invention discloses a recovery method of fine catalyst metal obtained after electrolysis and purification of synthetic diamond powder, which comprises the following steps of: 1, filling a mixture containing catalyst metal into a filter cloth bag and placing into an electrobath; 2, injecting a hydrochloric acid into the electrobath; 3, utilizing an electrolyte to cyclically heat an acid solution through a pipeline; and finally, pumping the acid solution into the electrobath for electrolysis recovery. According to the method, the mixed materials are soaked in the acid solution with intermediate concentration at a constant intermediate temperature, metals in the mixed materials are changed into a free ion state by a chemical reaction, and the metal ions are enriched on a cathode plate by a rapid electrolysis method so as to achieve the purpose of recovery of catalyst metal, accordingly, the phenomena that the anode is seriously passivated and precious metals are seriously corroded can be avoided, the fine catalyst metal can be recovered at high efficiency and high recovery rate, the labor intensity of staff is reduced, the side reaction occurring in the electrolysis process can be avoided, and the method has the advantages of safety and environmental protection.

Description

technical field [0001] The invention relates to a method for recovering fine catalyst metal, in particular to a method for recovering fine catalyst metal after electrolytic purification of powder synthetic diamond. Background technique [0002] After the superhard material is synthesized, it is necessary to crush and bag the powder catalyst diamond synthesis pellet as an anode for electrolysis. During the electrolysis process of the material, the catalyst metal inside the particles is gradually peeled off and electrolyzed from the outside to the inside, so as to achieve the purpose of recycling the metal catalyst. The recovery rate of primary electrolytic catalyst metal is about 85%, and the remaining metal is concentrated in the high magnetic mixture material after a series of subsequent physical methods. The high magnetic mixture material is mainly composed of graphite, diamond, and catalyst metal, and its metal content is 70%. about. When purifying and recovering the ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/00C25C7/00
CPCY02P10/20
Inventor 刘善跃严国军李璞车林郭浩李明辉
Owner ZHONGNAN DIAMOND CO LTD
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