本工艺是关于用氟化钠或酸性氟化钠和硫酸铝溶液合成高纯冰晶石的方法。过去曾以氟化钠或酸性氟化钠及硫酸铝溶液合成生成结晶,再行分离及洗涤生产冰晶石的方法。但是由于合成时的条件稍有变化,就会在冰晶石中混有低融点亚冰晶石。这时,对生成后的冰晶石不论怎样洗涤也难以除掉硫酸根,因此往往得到的是混入多量硫酸根的冰晶石。 This process is about the use of sodium fluoride or acidic sodium fluoride and aluminum sulfate synthesis of high-purity cryolite. In the past, sodium fluoride or acidic sodium fluoride and aluminum sulfate solution was synthesized to form crystals, and then isolated and washed to produce cryolite. However, due to a slight change in the synthesis conditions, cryolite sub-cryolite will be mixed in the cryolite. In this case, it is difficult to remove sulfates from the formed cryolite irrespectively of the type of washing. Therefore, it is often found that cryolite incorporates a large amount of sulfates.