Which method is used for concentration of gold and silver?

leaching
Explanation: Gold and silver ores are concentrated by leaching. In the leaching method, the ore is treated with a suitable reagent in which ore is soluble but impurities do not. Thus, impurities are removed by filtration.

How can gold ore concentrated by leaching?

Gold is then leached from the carbon particles by a strong solution of sodium cyanide and sodium hydroxide, and it is recovered from solution by electrowinning directly onto steel wool or by the Merrill-Crowe process.

Is leaching a method of concentration?

Leaching is a chemical process of concentration of ore. Here the ore dissolves in a chemical solution.

Which method is used for concentration of gold?

Common methods of concentration that are, to a variable degree, accessible to artisanal and small scale gold miners are: panning, magnets, sluicing, spirals, vortexes, centrifuges, shaking tables, and flotation – in increasing order of complexity and cost.

What method of concentration of minerals employs the use of mercury in gold extraction?

Mercury-Free Concentration Methods In many countries, elemental mercury is used in artisanal and small-scale gold mining. Mercury is mixed with gold-containing materials, forming a mercury-gold amalgam which is then heated, vaporizing the mercury to obtain the gold.

Which ore is concentrated by leaching method?

Among galena (PbS), copper pyrites (CuFeS2), cinnabar (HgS) and argentite (Ag2S) argentite being silver ore is concentrated by chemical leaching method.

Which of the following ore is concentrated by leaching?

What is the method of concentration of ore?

Ore concentration can be accomplished through a variety of methods, including hydraulic washing, magnetic separation, froth flotation, and leaching.

How concentration of ore is done by leaching or chemical method?

Leaching: Leaching is used when the ore is soluble in a solvent. The powdered ore is dissolved in a chemical, usually a strong solution of NaOH. The chemical solution dissolves the metal in the ore and it can be extracted and separated from the gangue by extracting the chemical solution.

What is gold concentrate?

Gold Concentrates. A concentrate containing more than 20g/t of gold, a gold concentrate becomes gold after going through the refining and smelting processes. The resulting gold is mainly used for making jewelry and electronic devices, as well as investment goods.

What is mining concentrate?

Ore concentrate, dressed ore or simply concentrate is the product generally produced by metal ore mines. The raw ore is usually ground finely in various comminution operations and gangue (waste) is removed, thus concentrating the metal component.