The advantages and disadvantages of the new process of gold
2020-11-04 16:21Introduction：The advantages and disadvantages of the new process of gold extraction by direct electrodeposition with gold cyanide solution The direct electrodeposition gold extraction process has the following advantages: 1. Simplified the technologica
The advantages and disadvantages of the new process of gold extraction by direct electrodeposition with gold cyanide solution
The direct electrodeposition gold extraction process has the following advantages:
1. Simplified the technological process, shortened the gold production cycle, and remarkable economic benefits;
2. There is no other material pollution in the recycling process, and the leachate can be recycled in a closed circuit to reduce environmental pollution;
3. Quick reaction speed and adjustable performance;
4. One step gold extraction, less loss, high total recovery, wide variety of ore;
5. With good selectivity, multiple precious metals are recovered at the same time, and the cathode sediments are easy to refine;
6. Save equipment investment and production consumption, and improve the utilization rate of CN-.
1. How to improve current efficiency and increase the processing capacity of accumulator tank;
How to keep the concentration of gold in the original cyanide solution from decreasing substantially;
3. How to eliminate the trouble caused by the filtering and washing of leached slurry caused by a large amount of slime in fine grinding materials.
Research trend of direct electrodeposition to extract gold process:
1. The development of solid-liquid separation equipment with high washing rate and new filter is very important;
2. Developed high-efficiency electrodeposition tank to increase its processing capacity.The United States is already doing research on this;
3. In order to solve the problem of current utilization rate, shenyang gold college has developed a special electrode, which not only has good adsorption performance, but also conducts electricity and can be used as an electrode.Gold is absorbed as the cyanide liquid passes through the electrode.After the gold-containing solution passes through several electrodes, the gold content of the lean solution drops below 1.0 x 10-6, and the adsorption rate can reach 99.9%.When the gold adsorbed on the electrode reaches saturation, it is used as anode and electrodeposited at the cathode, the recovery rate can reach 99.89%.
Direct electrodeposition of gold from gold cyanide solution is a promising alternative to carbon in pulp and zinc powder replacement.Direct electrodeposition of gold from highly concentrated (golg concentration above10 x 10-6) cyanide solutions has been reported for industrial application at home and abroad, while direct electrodeposition of gold from low-concentration (golg concentration below 10 x 10-6 ) cyanide solutions still needs further research and improvement, which is expected to be popularized in industrial production in the near future.
