| 摘要 |
PROBLEM TO BE SOLVED: To produce a hydraulic alumina having quick hardening properties even in a relatively low temperature region by adding a lithium salt to gibbsite or a transition alumina before pulverization and then pulverizing the resultant mixture. SOLUTION: A lithium salt in an amount of 0.05-5 pts.wt. (expressed in terms of Li2 O) is added to 100 pts.wt. transition alumina (expressed in terms of Al2 O3 ), prepared by instantaneously calcining gibbsite and having 40-100μm median particle diameter and the resultant mixture is then pulverized by using a ball mill, a vibrating mill, etc., to afford a hydraulic alumina having 1-20μm median particle diameter. The lithium salt, as necessary, may be added to the gibbsite before calcination. |
