PREPARATION OF HIGH PURITY ALUMINA

PURPOSE: A manufacturing method of high purity-alumina is provided to minimize the content of impurity including transition metal within alumina through purification process using the first absorber and the second absorber. CONSTITUTION: A manufacturing method of high purity-alumina comprises following steps. Manufacture aluminum alkoxide by reacting aluminium and alcohol of carbon number 1-10. React carbon black as a first absorber to the aluminium alcoholate, carry out filtering, add a second absorber, and perform refinement through distillation under reduced pressure. Obtain boehmite by hydrolyzing the refined aluminium alcoholate. The boehmite is obtained by calcination. The second absorber is selected from a γ-alumina, a noncrystalline boehmite, an α-alumina and the mixture of theses. From the second step, the first absorber is added to the aluminium alcoholate 100.0 comparison 0.5-10 parts by weight. From the second step, the second absorber is added to the aluminium alcoholate 100.0 comparison 0.5-10 parts by weight. [Reference numerals] (AA) Al ingredient; (BB) Alcohol; (CC) Adding water(trace); (DD) Adding a first absorber; (EE) Adding a second absorber; (FF) Adding water; (GG) Collecting water and alcohol; (HH) Obtaining high purity alumina; (S1) Alkoxide reaction; (S10) Milling; (S2) Aluminium alkoxide solution; (S3) Primary refinement(partial hydrolysis); (S4) Secondary refinement(transition impurity absorption); (S5) Third refinement(decompression distillation); (S6) Hydrolysis; (S7) Boehmite slurry; (S8) Filtration and drying; (S9) Calcination