Smelting is a process in gold production,Most of the on-site smelting in mines adopts traditional crucible smelting and converter smelting gold mud.Nonferrous smelters generally use pyrometallurgy,In actual production, the corresponding smelting process should be selected according to the nature of mineral raw materials and the content of harmful components such as zinc, arsenic, fluorine, and magnesium, as well as the occurrence state.
There are many gold ore production process and equipment schemes used in production practice, and the following are usually used:
1.flotation gold selection process introduction: This process is suitable for processing sulfide gold-bearing quartz vein ore with fine gold particles and high floatability, polymetallic gold-bearing sulfide ore and carbon (graphite) ore etc.
The equipment used are jaw crusher, cone crusher, vibrating screen, ball mill, flotation machine, etc. After crushing, the gold ore enters the ball mill for fine grinding, and then becomes pulp and then enters the flotation machine for flotation. In the flotation process, sodium carbonate is used as a regulator, and butyl xanthate and nigrosine are used as collectors. The flotation method cannot produce finished gold, and can only enrich gold into various sulfide concentrates at most. Therefore, a single flotation process is generally not used, but flotation is used as one of the combined processes.
2.introduction of gravity separation method gold selection process flow:
Gravity separation is the most effective and economical method for the separation of placer gold. It is suitable for placer gold ores and finely crushed gold minerals. The principle of beneficiation is based on the difference in mineral density. The main equipment used are chute, shaking table and jig. And short cone cyclone etc. The gold ore sand is placed in the cylindrical screen and flows through high-pressure water. The sand and gravel larger than the sieve hole are transported into the tailings yard through the dregs and belts; Stage jig beneficiation, the concentrate flows into the shaker by itself, and conducts coarse, fine and sweeping selection, and finally produces the fine sand ore.
3.introduction of gold extraction process by amalgamation method:
The gold extraction process by amalgamation is a chemical beneficiation method, which is an ancient gold extraction process. It is suitable for the recovery of coarse-grained monomer gold with coarse natural gold inlaid and stored in pyrite and other sulfide ores. The money is less and the process is simple, but the harm to the environment is greater. The initial steps of the amalgamation method are crushing and grinding as in the flotation process. When grinding the ore, sodium carbonate, caustic soda, etc. should be added, which can effectively improve the recovery rate of mercury and gold.
4.gold ore activated carbon introduction
The process of gold extraction by carbon slurry method prevailed in the 1980s, and is especially suitable for the separation of gold-bearing limonite oxide ore. The carbon slurry method uses activated carbon for adsorption on the basis of oxidative leaching, which can improve the leaching rate of gold. The technological process is crushing and grinding, the overflowing product of the puller, and then entering the thickener, and then entering the leaching adsorption tank through the buffer tank to carry out the leaching operation. The tailings are screened with high frequency to recover the gold in the crushed activated carbon, and then the cyanide-containing tailings are treated with liquid chlorine.
5.Introduction of gold extraction process by cyanidation
The gold extraction process by cyanidation includes several basic processes such as cyanidation leaching, washing and filtration of leaching pulp, extraction of gold from cyanide solution or cyanide pulp, and smelting of finished products.
6.Introduction of Heap Leaching Gold Process
Heap leaching is an excellent method for processing low-grade gold-bearing ores with low cost, simple operation and simple equipment. Heap leaching of gold is suitable for large-scale, low-grade gold ore. The technological process is to build a pile on the bottom pad material, and circulate and spray the sodium cyanide solution to dissolve the gold and silver in the ore.
7.Introduction of amalgamation and flotation combined process
This excellent process is to first use amalgamation to recover coarse-grained gold in the ore, and the amalgamation tailings are flotated. This process is suitable for processing single flotation processed ores, gold-bearing oxide ores and associated free gold ores. Higher recoveries were obtained with this procedure than with a single flotation procedure.
8.Introduction of combined cyanide process
This process is suitable for processing quartz vein gold-bearing oxide ores. The raw ore is re-selected first, and the concentrate obtained by gravity is subjected to amalgamation.
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