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ZINC PRECIPITATION ON GOLD RECOVERY Introduction Zinc dust cementation for gold and silver recovery is one of the best known contact reducing processes in mineral processing. It is also known as Merrill Crowe process from its founders, C.W Merrill of United States of America who started it and T.B Crowe from South Africa
Vein gold ore; Sulfide gold ore.In addition to separate gold, the process can also be used for flotation of copper ore, lead and zinc ore, fluorite ore, feldspar ore, graphite ore, tungsten ore and other metals and non metal ore.
When compared with the traditional process, it has advantages of processing without agent, low energy consumption, convenient management and high performance price ratio. It is suitable for separating gold, silver, tungsten, zinc, iron, manganese, lead, coal and other metal or heavy metal materials.
Cyanidation gold extraction processis a method in which gold is extracted from gold bearing ores using aqueous solution of cyanide as solvent, and then gold is extracted from gold bearing leaching solution. It includes cyanide leaching process and deposition gold extraction process. First, gold in the gold bearing ore reacts with cyanide to form a complex into the solution, and then the gold is removed from the solution to metal by a displacement reaction using reactive metal such as zinc. The reaction equation is: 4Au+8NaCN+2H2O+O2=4Na Au 2 +4NaOH 2 Na Au 2 +Zn=2Au+Na2 Zn 4
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The specific steps of cyanidation gold extraction process mainly include: ore39;s preparation stage, leaching stage and metal recovery stage. The preparation stage of ore is an essential process for gold extraction, which is mainly by crushing and grinding the ore to reduce the particle size of the ore. It can ensured that gold is present in the cyanide aqueous solution in the most economical form of recovery, thereby increasing the gold recovery rate. In addition to the crushing and grinding process, gold ore containing sulphide or carbonaceous minerals requires additional treatment prior to recycling. This is because cyanide leaches out sulfide firstly rather than metal, which will cause the consumption of cyanide. To counteract this effect, these ores can first through the flotation process to limit the interaction with cyanide during the leaching process. In addition, it is also possible to change the leaching process by adding activated carbon to preferentially adsorb gold. The c...
The recovery rate of cyanidation gold extraction process is very high. And gold can be produced on the spot, which can avoid the various drawbacks of long distance transportation of gold concentrate, thus conducive to improving the economic benefits of enterprises. 1. The gold extraction process flow lasts long, and the extraction speed is slow. 2. As a highly toxic material, cyanide poses a serious threat to the ecological environment and animal life. Therefore, the slurry waste discharge should be strictly controlled when cyanide is used for gold extraction. In order to avoid the environmental damage caused by cyanide, many mine owners begin to use new low toxic or low toxic leaching agentsfor gold extraction, which can not only replace sodium cyanide without changing the original equipment and cyanidation process, but also can achieve 100% environmental protection.
There is a 270tpd gold and silver cyanidation plant in Japan, in which the metal minerals mainly include native gold, silver, and pyrite. Gangue minerals mainly composed of quartz and calcite. Gold exists mainly in free state in ore. The ore contains 5.0g/t of gold and 20g/t of silver. The plant completely adopts the all sliming cyanidation method, the final gold recovery rate is 97.6%, and the silver recovery rate is 89%. The tailings contain 0.12 g/t of gold and 2.4 g/t of silver.