Method for Extracting Tungsten and Other Rare Metals From Waste Hard Alloy

The invention relates the method of extracting tungsten and other rare metals from waste and old carbide alloy, belonging to waste and old carbide alloy reclamation and utilization technology field. The method comprises the following steps: melting the waste and old carbide alloy with sodium acid carbonate or sodium carbonate in water, forming ammonium tungstate solution and precipitum containing other rare metals, separating them, heating the tungstate solution, then crystallization, drying, calcining, and adding hydrogen gas to deacidize, get tungsten powder; and mixing the precipitum with sulfuric acid and ammonium oxalate to extract cobalt powder, nickel powder, tantalum and niobium. The method has the advantages of low cost and great economy value.




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