铝(Al2O3)含量21.49%,烧失量6.76%,白度80.7
铝(Al2O3)13-18%,白度60-70
1.铝(Al2O3)含量16.11%,白度54,烧失3%
2.铝(Al2O3)含量15.24%,白度43,烧失2.9%