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常用的稀土镁中间合金分析方法需要把试样置于银坩埚中,加氢氧化钠在马福炉上熔融(650～700℃)。熔融时温度的高低、时间的长短难以掌握,熔融不好,浸出液往往混浊,造成返工。硅用重量法测定,须经蒸干、脱水、过滤和灼烧,灼烧后还须用铂坩埚加氢氟酸处理;稀土也用重量法测定,但须静止一个晚上才能过滤,时间长;铁用重铬酸钾滴定法测定,须用大量氯化高汞,有污染;锰用亚砷酸钠——亚硝酸钠容量法测定,亚砷酸钠有害人体健康。根据上述存在问题,一方面学习有关厂的先进经验,一方面经过多次试验,对稀土镁中间合金的分析方法作了改进。
Commonly used rare earth magnesium master alloy analysis method requires the sample placed in a silver crucible, plus sodium hydroxide melted furnace melting (650 ~ 700 ℃). When the melting temperature level, the length of time is difficult to grasp, poor melting, leaching solution is often cloudy, resulting in rework. Determination of silicon by gravimetric method, to be evaporated, dehydrated, filtered and burned, after burning must also be treated with platinum crucible hydrofluoric acid; rare earth is also determined by gravimetric method, but to be static one night to filter, a long time; Iron with potassium dichromate titration method, to be used a large number of chlorinated high mercury, contaminated; manganese with sodium arsenite - sodium nitrite volumetric method, sodium arsenite is harmful to human health. According to the above problems, on the one hand to learn the advanced experience of the plant, on the one hand after many tests, analysis of the rare earth magnesium master alloy has been improved.