A method is proposed to determine free native silver and free silver sulphide in lead - zinc concentrate.
拟定了分离测定铅锌精矿中游离硫化银和游离自然银的方法.
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The leaching solvents for the separation of silver sulfide native silver were investigated in this test.
研究价廉易得的铝作为还原剂,从含硫化银废水中制取试剂级硝酸银.
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