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在用拜耳法生产氧化铝过程中,对氢氧化铝进行的分级,是使氢氧化铝保持一定的粒度,以便使氢氧化铝和溶液分离。制取粗粒氧化铝(所谓砂状氧化铝)通常采用如图1所示的分级工艺。
In the production of alumina by the Bayer process, the aluminum hydroxide is fractionated by maintaining the aluminum hydroxide at a certain particle size in order to separate the aluminum hydroxide from the solution. The preparation of coarse-grained alumina (so-called sand-like alumina) usually uses the grading process shown in Figure 1.