| http://www.w3.org/ns/prov#value | - A process for treating hazardous material containing tungsten, arsenic, magnesium, silicon, and other elements to recover said tungsten and to render the remaining material nonhazardous with respect to arsenic, said process comprising: (a) digesting said material in an aqueous solution of an alkali metal hydroxide, at a pH of from about 10.0 to about 13.0, for a sufficient period of time to produc
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