Purpose Re-crystallization, purification and classification In alumina production, after the crude liquid is desiliconized, the solution contains a large amount of impurities such as silicon slag and red mud, which cannot be directly decomposed. In order to make the product alumina meet the national standards, the crude liquid must be clarified and separated after desiliconization to make a pure and transparent sodium aluminate solution. When processing the desiliconized solution, leaf filters or filter presses are commonly used in the industry to separate the silicon slag in the desiliconized solution. The task of the silicon slag separation process is to separate the desiliconization slurry sent from the desiliconization process to obtain sodium aluminate semen whose desiliconization index, iron-to-aluminum ratio, and float content meet the technological requirements, and then send the semen to carbonic acid Chemical decomposition. The quality of semen is the key to ensuring the quality of the final product alumina.
