| 摘要 |
<p>PURPOSE: A method for collecting tungsten and cobalt from a hard metal alloy sludge by hydrometallurgical process using aqua regia is provided to collect tungsten, cobalt, and nickel through simple processes without oxidation processes. CONSTITUTION: A method of processing hard metal alloy sludge comprises following steps. Hard metal alloy sludge is put into the aqua regia, so mixed solution is manufactured(S110). The mixed solution is stirred and filtered, so tungstic acid is collected(S120). Cobalt hydroxide and nickel hydroxide are created and collected(S135). The collected tungstic acid is dissolved in ammonia solution and filtered in order to remove impurities which are not dissolved. Hydrochloric acid is added and heated to manufacture high purity tungstic acid(S150).</p> |
