It is necessary to utilize special techniques of separating submicron-size particles from other micron-size particles such as hydrocyclone and liquid-liquid separating. In this experimental work, separation of TiO
2 and Al(OH)
3 artificial mixture was investigated. Separation of submicron TiO
2 particles from micron Al(OH)
3 particles was carried out using a column bed filled with plastic fiber tubes or glass balls as matrixes. The Al(OH)
3 particles have been mainly captured on the matrixes due to the hetero-coagulation effect. Large particles could be easily attached on matrixes because of strong lift force, and surface interactions between particle and matrix. The submicron TiO
2 have been flowed out from the apparatus because of low collision possibility with the matrixes. As a result, submicron TiO
2 particles were separated from micron size Al(OH)
3 ones. This method could be applied to separate submicron TiO
2 particles from Brazilian clay.
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