According to statistics, more than 80% gold mines in the world use cyanide gold extraction process, while 85% of them use sodium cyanide to extract gold. However, cyanide is a highly poisonous and dangerous chemical, and any accidents in transportation storage and usage will result in serious consequences. Therefore, many countries and states have explicitly banned or restricted the use of sodium cyanide in gold extraction and the global gold extraction industry urgently needs an environmental gold extraction agent that can completely replace cyanide.
In order to probe the difference of leaching effect between NaCN leaching agent and CNFREE leaching agent on gold ore, ITAO select a total of six gold mineral samples-the Sultan Kush oxidized gold ore, Tanzania one mining company oxidized gold ore, and mixed ore (containing oxidized ore and primary ore), Tanzania oxidized gold ore gravity concentration tailings for leaching comparison test. Under the same cyanide leaching conditions, the differences between NaCN leaching agent and CNFREE leaching agent in leaching agent dosage, leaching rate and gold adsorption rate were emphatically studied, and the economic benefit analysis of the comparable project was also conducted.
Gold Mine All Sliming Cyanidation CIL Process
Carbon leaching process is characterized by simultaneous gold leaching and adsorption stages, with normal leaching segments of 6-10 segments. In the leaching process, ensure the fineness of grinding products – 200 mesh accounted for 85-95%, the pulp concentration accounts for 40-45%, then add a certain volume of CNFREE ECO gold leaching agent. Make sure the leaching slurry concentration is not less than 0.015% to efficiently leach the gold ore. At the same time, lime is added to maintain a higher pH.
Gold Mine All Sliming Cyanidation CIP Process
As the same with conventional cyanidation process, the leaching slurry concentration and the oxygen content in the leaching pulp are strictly controlled during the agitation leaching stage. By adding a certain volume of CNFREE gold environmental leaching agent to adjust the leaching concentration to 0.05% to 0.08%. The oxygen content in the slurry needs to control the aeration volume and the inflation pressure. The general aeration volume is 0.02 m3/m3•min, and the inflation pressure is 100 KPa. It is appropriate to uniformly distribute small bubbles of 5~15mm diameter on the surface of the slurry during production, and control the volume by adjusting the main valve of the air pump and the inflation valve of each tank.