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通常,对排水中含有的镉等重金属离子,是用石灰等碱性药剂,作为氢氧化物加以沉淀脱除。在该法中,在使Cd~(++)离子浓度降至相当低量时,由于溶解度积的关系,必须使pH值保持在10～12左右。而且,当考虑到产生的沉淀物体积大并且还需要再溶介时,则沉淀物的处理,就成为很大负担。在含有Cd~(++)离子的排水中加入黄药以分
In general, heavy metals such as cadmium contained in the drainage water are precipitated and removed as hydroxides by using an alkaline agent such as lime. In this method, when the concentration of Cd ~ (++) ions is reduced to a relatively low level, the pH value must be kept at about 10 to 12 due to the solubility product. Moreover, the settling of sediments becomes a significant burden when considering the large volume of precipitate that is produced and the need for re-dissolution. In the containing Cd ~ (++) ions in the drainage of xanthate to points