A US company has developed a new process for recovering tungsten from tungsten-containing waste. The process of the process is: firstly digesting the tungsten-containing waste material with a sodium hydroxide solution to form a sodium tungstate solution, crystallizing the sodium tungstate crystal; then dissolving the sodium tungstate crystal in the circulating mother liquor to regenerate the sodium tungstate solution; The tungsten is extracted by an organic extractant, and the ammonium tungstate is purified and evaporated to form ammonium paratungstate and a mother liquor containing tungsten, silicon, arsenic , phosphorus and molybdenum , and the mother liquor can be recycled. The advantage of this process is that the mother liquor can be recycled, avoiding the problem of releasing large amounts of ammonium salts in the past process.
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The material used partly determines the extent of thermal conductivity. Copper and aluminum are the most widely used materials, though aluminum is the more common choice because copper is more expensive and heavier. Aluminum 6061 and 6063 are widely used with a thermal resistance of 166 and 201 W / mK, respectively.
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