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电解铝生产中,于电解质内加一定量的锂盐有提高电流效率、降低电解质初晶温度、减少电流消耗及阳极损耗,防止环境污染等优点。但锂盐加入过多也会给生产带来不利,因此需要控制铝电解质中氟化锂的含量。 本文采用空气—乙炔火焰原子吸收法测定铝电解质中的锂,直接以氟化锂表示分析结果。方法手续简便、干扰少,不用分离便可直接进行测定。 试验了共存碱金属元素及其它元素,以及不同浓度的酸对测定锂的影响,结果表明:0.5mg/ml的钾、钠、铷和銫对0.5鹏g/
In electrolytic aluminum production, adding a certain amount of lithium salt in the electrolyte has the advantages of improving current efficiency, reducing the temperature of the primary crystal of the electrolyte, reducing current consumption and anode loss, and preventing environmental pollution. However, adding too much lithium salt also brings disadvantages to the production, so the content of lithium fluoride in the aluminum electrolyte needs to be controlled. In this paper, air - acetylene flame atomic absorption method for the determination of lithium in the electrolyte of aluminum, lithium fluoride directly to the results of the analysis. Method of procedure is simple, less interference, without separation can be directly measured. The effects of coexisting alkali metals and other elements and different concentrations of acids on the determination of lithium were tested. The results showed that 0.5 mg / ml potassium, sodium,