ã€China Aluminum Industry Network】A method for preparing ultra-fine aluminum hydroxide, which touches sodium aluminate NaAlO2 solution and carbon dioxide-containing gas to produce aluminum hydroxide gel by carbonization under high-gravity conditions, and then obtains different crystals. The type of ultrafine aluminum hydroxide mainly consists of carbonization, filtration, washing and boring. The invention can utilize the central commodity NaAlO2 solution and CO2 exhaust gas, adopting the spiral channel type rotating bed RBHC to perform carbonization reverberation as the primary technology to prepare the nanometer ultrafine aluminum hydroxide solution, and solves the problem that the traditional mixing tank method has low absorption rate for carbon dioxide gas and carbonization Long time, low purity of the product, non-uniform particle size, and easy-to-plug technology problems such as reversible carbonization of the packed bed RPB. Separate from the preparation of nanocrystalline ultrafine fibrous and granular aluminum hydroxide. The present invention prepares approximately 10 nm granular aluminum hydroxide as an outstanding inorganic flame retardant; the prepared nano-fibrous pseudo-boehmite having a particle size of about 5 nm and a length of 200 to 300 nm can be widely used in the catalytic field. 1. A preparation method of ultrafine aluminum hydroxide, which involves contacting a sodium aluminate NaAlO2 solution with a gas containing carbon dioxide, and preparing a pseudoboehmite gel by a carbonization reaction method under high-gravity conditions, and then obtaining a different crystal. The type of ultrafine aluminum hydroxide mainly consists of carbonization, filtration, scrubbing, and boring processes. It is characterized by: 1) The concentration of sodium aluminate NaAlO2 solution is controlled to 0.05-2 mol/L; 2) Participation in sodium aluminate NaAlO2 solution An organic polymer dispersant with a mass content of 1 to 2%; 3) The above mixture is put into the reverberator (4), the reaction device (4) is turned on, and after the liquid flow in the reverberator (4) is stabilized, the reverberator is (4) Contain the concentration of CO2 gas, control reaction device (4) speed is 200 ~ 3000rpm, gas-liquid ratio is 0.5 ~ 20, carbonization reaction temperature is controlled at 0 ~ 100 °C, punctual record temperature and pH value, When the pH value reaches 9-12, the CO2 gas is stopped, and the falling reverberator (4) is recirculated for a period of time to obtain the aluminum hydroxide precursor; 4) The above commodities are continued to be treated as a suitable different crystal form. Not the process of aging; the above reverberator (4) is a rotating bed The gravitational reverberator (4) mainly comprises a rotor (5), a diffuser (15) arranged in the center of the rotor (5), an inlet (8), an air inlet (3, 9), and an exhaust port (7) , discharge port (14, 16). Galvanized Welded Wire Mesh,Welded Wire Mesh Fence,Garden Welded Mesh,Welded Wire Mesh Galvanized Shenzhou City Hongda Hardware Products Co.,Ltd , https://www.hdpvcwire.com
Preparation method of ultrafine aluminum hydroxide