| 摘要 |
A process for producing alumina sols characterized by neutralizing a water-soluble basic aluminium salt of the formula, Al2(OH)xXyYz wherein X is Cl or NO3, Y is SO4, and x, y and z are numbers satisfying the equations, x+y+2z=6, 0<x<6, 0</=y<6, 0</=2z<6, provided that y and z are not zero at the same time, with an alkali to produce alumina gels, and the subjecting said alumina gels to a hydrothermal treatment in the presence of a monovalent organic acid of such an amount that the molar ratio of the organic acid to aluminium is from 0.001 to 0.15. The alumina sols of the present invention are low in viscosity, high in Al2O3 content and are extremely superior in stability with the lapse of time, and produce alumina powders superior in re-dispersibility.
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