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现时工业上用以生产氧化铝的碱法中,拜耳法和联合法都有矿石溶出过程。过程的实质是用苛性碱液提取铝土矿中的氧化铝。铝土矿都或多或少含有氧化硅,在溶出过程中,依反应温度和其矿物形态而部分或全部溶出,并随即与溶液中的铝酸钠结合成水合铝硅酸钠沉淀(在有石灰存在时,部分转化成水化石榴石系化合物——水合铝硅酸钙),残留于溶出后固相——赤泥中。矿石中氧化铝除与氧化硅反应结合外,其余都认为是可溶出的。可溶
At present, in the alkali process for the production of alumina, both the Bayer process and the combined process have the ore dissolution process. The essence of the process is the extraction of alumina from bauxite with a caustic solution. Bauxite contains more or less silicon oxide, in the leaching process, according to the reaction temperature and its mineral form and part or all of the dissolution, and then with the solution of sodium aluminate into hydrated sodium aluminosilicate precipitation (in the presence of In the presence of lime, it is partially converted into a hydrated garnet compound, hydrated calcium aluminosilicate, remaining in the solid phase after dissolution - red mud. Ore in addition to alumina and silicon oxide reaction combined, the rest are considered to be soluble. Soluble