| 摘要 |
ALUNITE TYPE COMPOUND PARTICLES REPRESENTED BY THE FOLLOWING GENERAL FORMULA (I) AND HAVING A SPECIFIC VALUE OF D75/D25 WHEN D25 IS THE PARTICLE DIAMETER OF PARTICLES WHICH ACCOUNT FOR 25 % OF THE TOTAL END D75 IS THE PARTICLE DIAMETER OF PARTICLES WHICH ACCOUNT FOR 75 % OF THE TOTAL IN THE CUMULATIVE PARTICLE SIZE DISTRIBUTION CURVE MEASURED BY A LASER DIFFRACTION METHOD: MA[A11-XM' X]3(SO4-2)Y(OH),-MH20 (I) WHEREIN M IS AT LEAST ONE CATION SELECTED FROM THE GROUP CONSISTING OF NA+ , K+, NH4+ AND H3O+ , M' IS AT LEAST ONE CATION SELECTED FROM THE GROUP CONSISTING OF CU 2+, ZN2+, NI 2+. , SN4+, ZR4+ AND TI4+-, AND A, M, X, Y AND Z SATISFY 0.8≤A≤1.35, 0≤M≤5, 0≤X≤0.4, 1.7≤Y≤2.5, AND 4≤Z≤7 RESPECTIVELY.THE ABOVE OARTICLES OF THE PRESENT INVENTION HAVE A SMALL AVERAGE PARTICLE DIAMETER, ARE SPHERICAL, DISK-LIKE OR HEXAGONAL AND HAVE AN EXTREMELY NARROW PARTICLE SIZE DISTRIBUTION. |
