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众所周知,现今铝矾土的年需求量已在80百万吨以上。然而,在现有技术条件下能够进行有效精炼的、SiO_2含量低于5%的优质铝矾土,将在最近20～30年内耗用净尽。但是粘土和高岭土的储量实际上不会耗用净尽,并且它们矿床的分布也十分广泛。因此利用粘土和高岭土作为精炼氧化铝原料,这一课题早就引起了研究者们的注意。粘土和高岭土可采用露天方式进行开采,易于分选,也可采用各种方法:酸法、碱法和酸-碱法对它们进行精炼。目前,将高岭土原料和石灰石一起烧结,以便
As we all know, the annual demand for bauxite is now over 80 million tons. However, the high quality bauxite with an SiO 2 content of less than 5%, which can be effectively refined under the state of the art, will be depleted in the last 20 to 30 years. However, the reserves of clay and kaolin are virtually depleted and their deposits are widely distributed. Therefore, the use of clay and kaolin as a raw material for refining alumina, the subject has long attracted the attention of researchers. Clay and kaolin can be mined open-air, easy to sort, you can also use a variety of methods: acid, alkali and acid-alkali method of refining them. At present, kaolin materials are sintered together with limestone so as to be