gold mining equipment, ore crushing plant, Gold Ore Processing
gold mining equipment, ore crushing plant, Gold Ore Processing
gold mining equipment, ore crushing plant, Gold Ore Processing

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gold mining equipment, ore crushing plant, Gold Ore Processing

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Brand Name : sievo

Product description

Specifications gold mining equipment, ore crushing plant

1.large capacity,

2.long life,

3.energy-saving.

                    Gold Ore Processing        The refined gold is widely used in many industries such as jeweler, electronics, dentistry, glass manufacturing, medicine, aerospace, the arts, porcelain dinnerware, decorations in architecture, medallions, coins, gold bars purchased as investments and so on. A world-renowned places of gold producing include Witwatersrand in South Africa, the United States, California and Alaska, Australia, New South Wales, Ontario, Canada, Russia, the Urals and Siberia and so on.
Gold ore processing includes the following steps
Comminution:The process of reducing the ore to fine particles through crushing and milling. Crushing is the process whereby mined ore is fed through mechanical crushing devices that progressively reduce the size of the ore. Milling is a physical process where the crushed ore is fed into a mill (i.e. rotating drums) and the action of the ore being tumbled (often in the presence of steel balls) reduces the ore to a slurry of fine particles.
\   Flotation: The process used to separate gold and metal sulfides from the gangue (i.e. waste). Aeration of the milled slurry, and the addition of specific chemical reagents, encourages froth formation, while activators are added to promote flotation of gold-bearing compounds. The froth that floats to the surface contains most of the gold and iron sulfides, and is extracted for further treatment. This material is known as the concentrate.
Thickening: Thickening reduces the water content of the concentrate slurry, separating the water from the heavier mineral-rich solids through gravity.  
Roasting: Where gold is trapped in sulfides such as pyrite, roasting of the concentrate is required to convert the sulfides to oxides (called calcine), with sulfur in the sulfides liberated as sulfur dioxide. Oxidation is necessary for the subsequent gold leaching and recovery processes to operate effectively.
Biological Oxidation: This is an alternative method for the oxidation of sulfides. Recent advances in technology have resulted in the development of a biological process for the oxidation of sulfide concentrates. In this process bacteria are used to oxidise sulfide concentrates.
Cyanidation: Cyanide is added to the process slurry to promote the dissolution and complexing of the gold. Gold enters solution as a gold-cyanide complex ion.
Carbon-in-pulp (CIP): CIP involves the removal of complex gold ions from solution by adsorption onto activated carbon. Slurry that has undergone cyanidation is passed through a cascade of agitation tanks. As the slurry moves down the cascade, gold is adsorbed onto granular activated carbon that is extracted and pumped to the next tank. The result is a counter-current flow (as Figure 3), where the loading of gold on carbon increases in the opposite direction to slurry flow. Loaded carbon is retrieved from the first tank in the series.
Carbon-in-leach (CIL): An alternative process to CIP. The main difference between the processes is that the cyanidation and adsorption processes are not staged separately, so that gold dissolution and recovery from the slurry proceed simultaneously in each CIL tank.
Heap/dump leach process. This is an alternative leaching process for relatively low-grade gold-bearing ores. The ore is placed onto pads with the addition of lime (to control pH) and sprayed with weak cyanide solution. The solution slowly infiltrates through the heap to dissolve the gold into solution. Heaps are lined to prevent loss of the solution. The ore may either be crushed or uncrushed, and the leaching process continues for several weeks or months. The gold-bearing solution collects in drains at the edges of the heap and is pumped to a gold recovery circuit.
Elution: The washing of loaded carbon in hot water, caustic and cyanide solution to remove gold to the washing liquor. The resulting liquor is known as pregnant solution. Acid is used prior to elution to remove inorganics.
Electrowinning: The application of an electric current to the pregnant solution to precipitate gold onto steel wool cathodes. Excess steel wool may be dissolved in hydrochloric acid to leave crude gold.
Smelting: The melting of crude gold separates impurities that float to the surface as slag. The slag is poured off and the molten gold is poured into moulds. The resulting mine bars (or gold doré) contain some silver and base metals.
Refining: Refining is the production of gold ingots from doré, and is carried out at a limited number of sites (e.g. the Perth Mint). The Perth Mint refining process involves melting of the gold doré and injecting with chlorine gas under high pressure. Silver and base metals form gaseous chloride compounds, which are ducted via an extractor system to a wet scrubber, where particulates are removed and residual chlorine is neutralised. When the gold melt has attained 99.9% purity it is cast as ingots. Refining is not covered in this manual.
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