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what is cadmium for in gold mining

what is cadmium for in gold mining

Cadmium Minerals Education Coalition

Cadmium is a very soft, silvery white metallic element that can be cut with a knife. Cadmium has many chemical similarities to zinc and is often recovered from the primary zinc ore sphalerite. The single most important use of cadmium is in the production of nickel cadmium batteries.

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Cadmium rarely appears in nature and is most commonly sourced by its removal from zinc metals during the refining process. Cadmium is therefore produced in countries where zinc is refined, not necessarily in the countries where zinc ore is mined. China, Japan, and Korea are the worlds largest producers, followed by Mexico, the United States, the Netherlands, India, the United Kingdom, Peru and Germany. Fifteen other countries produce smaller amounts.

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The single most important use of cadmium is in the production of nickel cadmium batteries. About three quarters of the cadmium consumed annually is used to make batteries. Nickel cadmium batteries are rechargeable and have found wide use in cellular phones, hand held cordless power tools, cameras, portable computers, and a wide variety of household products. These applications account for the majority of the Ni cad batteries produced. The remaining represents batteries used for emergency power supplies in hospital rooms, for emergency lights, telephone exchanges, etc. Cadmium is useful in a small number of other applications. Cadmium sulfide is used as a paint pigment. Cadmium is used to make low temperature melting alloys, such as solder and Woods Metal for indoor sprinkler systems. The latter is an alloy of 50%Bi, 25%Pb, 12.5% Sn, and 12.5%Cd which melts at about 160 degrees Fahrenheit, the temperature of a very hot shower. Cadmium compound...

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