Controllable preparation method of flaky alumina

• Main Authors: LIANG ZHIMIN, LIU ZHIRUI, TAN LILIN, MO SHIGUANG, ZENG LIANGDAN, PENG XINGKAI
• Format: Patent
• Language: Chinese; English
• Published: 18.04.2023
• Subjects: CHEMISTRY; COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS; INORGANIC CHEMISTRY; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLIDMATERIALS OR FLUIDS; METALLURGY; PERFORMING OPERATIONS; SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATICTABLES OR JIGS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS; SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATICTABLES OR JIGS; TRANSPORTING

The invention discloses a controllable preparation method of flaky aluminum oxide. The invention aims to provide a method for preparing flaky alpha-Al2O3 micron seed crystal at low temperature, and controllable preparation of seed crystal particle size is realized through a hydraulic classification method. The method comprises the following steps: uniformly mixing and grinding aluminum salt and urea, and drying to obtain a urea-aluminum complex; uniformly mixing with soluble molten salt, and calcining for 2-10 hours at the temperature of 550-1100 DEG C to obtain a flaky alpha-Al2O3 seed crystal; then screening by utilizing hydraulic classification to obtain flaky alpha-Al2O3 seed crystals with different particle size ranges; the preparation method comprises the following steps: uniformly mixing seed crystal, aluminum salt, soluble molten salt and a crystal growth regulator solution to obtain a suspension A, adding soluble phosphate into an alkaline aqueous solution, and uniformly mixing to obtain a solution B