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CORVALLIS, Ore. - An alarming number of white-tailed ptarmigan in a large region of the southern Rocky Mountains are suffering from acute cadmium poisoning - an exposure to high concentrations of the extremely toxic trace metal.

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concentrate dust may result in lead and cadmium absorption and possible lead intoxication. Symptoms include headache, nausea, vomiting, abdominal spasms, fatigue, sleep disturbances, weight loss, anemia and leg, arm, and joint pain.

A Highly Toxic Metal with Many Uses. The Agency for Toxic Substances and Disease Registry (ATSDR) publishes a priority list […]

Recoveries and concentration ratios, based on exhaustive laboratory tests on this ore, indicate that net smelter returns from concentrates produced in a selective flotation mill on the property, especially designed to treat this ore, …

Cadmium (Cd) - Chemical properties, Health and ... Human uptake of cadmium takes place mainly through food. Foodstuffs that are rich in cadmium can greatly increase the cadmium concentration in human bodies.

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Metallic zinc production from sulfide zinc ore is comprised by the stages of ore concentration, roasting, leaching, liquor purification, electrolysis and melting. During the leaching stage with sulfuric acid, other metals present …

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2. Processes. Cadmium minerals do not occur in concentrations and quantities sufficient to justify mining them in their own right, but they are present in most zinc ores and are concentrated during zinc ore processing. Cadmium is a byproduct of the extraction and refining of zinc metal from zinc sulfide ore concentrates.

A mixture of sintered ore and coke was fed into the top of the furnace, and a current of 10,000–20,000 amperes, at a potential difference of 240 volts, was applied between carbon electrodes in the furnace, raising the temperature to 1200–1400 °C.

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The highest concentration of cadmium is absorbed in the kidneys of humans, and up to about 30 mg of cadmium is commonly inhaled throughout human childhood and adolescence. Cadmium is under preliminary research for its toxicity in humans, potentially affecting mechanisms and risks of cancer, cardiovascular disease, and osteoporosis.

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Cadmium can cause adverse animal and human health impacts at high levels or at lower levels if exposure occurs over a prolonged period. To prevent soil from cadmium contamination of phosphate fertilizer, it is primordial …

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Cadmium is mainly a byproduct of beneficiating and refining of zinc metal from sulfide ore concentrates. Refining of zinc and its cadmium content, can be accomplished by treating the zinc concentrates and/or zinc-bearing secondary materials using either a hydrometallurgical or pyrometallurgical process.

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No cadmium ore is mined for the metal, because more than enough is produced as a byproduct of the smelting of zinc from its ore, sphelerite (ZnS), in which CdS is a significant impurity, making up as much as 3%.

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The distribution of cadmium in zinc concentrate is not known, but cadmium is more associated with iron after roasting. Cadmium will volatilize from concentrate to some extent in an inert atmosphere, but more readily in carbon monoxide.