A kind of preparation method of high-purity flake alumina
A technology of flaky alumina and hydrated alumina, applied in the preparation of aluminum hydroxide, alumina/aluminum hydroxide, etc., can solve the problems of harsh reaction conditions, high equipment requirements, uneven doping of molten salt, etc. The particle size is uniform, the uniformity of doping is improved, and the effect of meeting application requirements
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Embodiment 1
[0035] Dissolve 200g of 5N grade aluminum isopropoxide in 294g of isopropanol under heating in a water bath at 80°C to prepare an aluminum isopropoxide solution (solution A), and place it in a funnel; mix 53g of deionized water with 236g of isopropanol Mix well, then add 10g of analytically pure ammonium fluoride, stir to make it completely dissolved in isopropanol-water solution, prepare solution B, and place it in a four-necked round-bottomed flask; Put the flask into the water bath heater, keep the temperature of the water bath at 80°C, then install the funnel containing solution A on the four-necked round-bottomed flask, and install a reflux condenser and a stirrer on the four-necked round-bottomed flask at the same time; Add solution A to solution B gradually at a dropping rate of 1 / min, and start stirring at the same time. Under the action of heating and stirring, the aluminum isopropoxide molecules in solution A and the water molecules in solution B undergo a hydrolysis ...
Embodiment 2
[0037] Dissolve 612g of 5N grade aluminum isopropoxide in 1080g of isopropanol to prepare aluminum isopropoxide solution (solution A), mix 216g of deionized water with 900g of isopropanol and 30.6g of ammonium fluoride to prepare solution B, Solution A was placed in a funnel, solution B was placed in a round bottom flask; solution A was added to solution B at a rate of 12 mL / min, and the temperature of the water bath was kept at 85°C. Under the action of heating and stirring, the solution A contained The aluminum isopropoxide molecule reacts with the water molecules in solution B to produce hydrated alumina, and at the same time produces isopropanol, and the volatilized isopropanol is condensed and returned to the flask during the heating reaction; then, the hydrated alumina solution Filtrate to obtain alumina hydrate filter cake, the filtrate is isopropanol, which can be recycled; then, dry the alumina hydrate filter cake in an oven at 160°C to obtain hydrated alumina powder; ...
Embodiment 3
[0039] Dissolve 1244g of 5N grade aluminum isopropoxide in 1080g of isopropanol to prepare solution A, mix 162g of deionized water with 900g of isopropanol and 61.2g of ammonium bifluoride to prepare solution B, put solution A in a funnel, and B is placed in a round-bottomed flask; solution A is added to solution B at a rate of 18mL / min, and the temperature of the water bath is kept at 65°C. Under the action of heating and stirring, the aluminum isopropoxide molecules in solution A and solution B The water molecules in the water undergo hydrolysis reaction to produce hydrated alumina, and at the same time produce isopropanol, and the volatilized isopropanol during the heating reaction is condensed and returned to the flask; then, the hydrated alumina is filtered to obtain a filter cake, and the filtrate is isopropanol propanol for recycling; then, put the hydrated alumina filter cake in a vacuum oven and dry at 150°C to obtain hydrated alumina powder; finally, put the hydrated ...
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