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An investigation on the processes for the purification of alumina by using the wash-grinding method

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As part of research to establish the industrial processes for the production of high-purity alumina, these following purification processes were carried out. First, the sodium components included in the aluminium hydroxide which was used as a raw material was eliminated by adsorption using a silica powder, and then the exposed sodium components on the surface of alumina during the wet grinding procedure by a ball mill was also gushed out and at the same time the particle size distributions of products could be controlled up to under the submicron range. The whole purification process is called the wash-grinding method. As a result, the properties of laboratory products had good agreement with those of commercial products and it was confirmed that the purification process was technically feasible.

Affiliations: 1: Powder Technology Research Division, Korea Research Institute of Chemical Technology, PO Box 9, Daedeog-Danji, Korea 305-606


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