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| 1. | zinc concentrate |
| 锌精矿 |
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| 2. | 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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| 3. | the first purification process made the second purificat process difficult to carry out because the zinc |
| 由于锌精矿的高钴多杂化,硫酸锌溶液含钴上升,造成硫酸锌一次净化后液含钴上升,二次净化困难,难以产出合格的新液。 |
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