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根据冰晶石-氧化铝熔盐电解时影响氟化盐利用率的许多技术指标,铝工业要求提高氟化盐的质量。提高冰晶石的分子比可以减少铝电解时氟化盐的挥发和水解。因此,在用电解法生产铝时,最好采用分子比在2到3的冰晶石。冰晶石的分子比取决于氟氢酸制取冰晶石时所用中和物质(氢氧化铝和纯碱)的比例。氟氢酸是用水吸收萤石精矿被硫酸分解生成的含氟气体制得,而此气体中除氟化氢外,还含
According to many technical indicators that affect the utilization of fluoride salts during the cryolite-alumina melt electrolysis, the aluminum industry requires improved fluoride salt quality. Increasing the molecular ratio of cryolite can reduce the volatilization and hydrolysis of fluoride salts during aluminum electrolysis. Therefore, it is preferable to use cryolite having a molecular ratio of 2 to 3 when aluminum is electrolytically produced. The molecular ratio of cryolite depends on the ratio of the neutralizing substances (aluminum hydroxide and soda ash) used in the preparation of cryolite from hydrofluoric acid. Hydrofluoric acid is water-absorbing fluorite concentrate is generated by the decomposition of sulfuric acid fluoride gas obtained, and this gas in addition to hydrogen fluoride, but also containing