Refers towards the purity of 99.99%, high purity alumina ultrafine powders with uniform size, could be the largest production value production in 21st century 1 from the most higher, by far the most broadly employed and sophisticated materials. Higher purity fine alumina with higher hardness, high strength, put on resistance, corrosion resistance, heat resistance, oxidation resistance, insulation resistance, surface region, modest thermal expansion coefficient, thermal shock resistance, low dielectric loss properties of, extensively utilized in insulation supplies, electronic items and aerospace supplies, corrosion resistant components such as high-tech cutting edge market. Alumina alumina-oriented solutions in China, fine alumina in particular low sodium, Superfine and higher purity alumina production has not yet reached the degree of industrialization, products mostly rely on imports. Using the development of domestic high-tech business, escalating demand for high-grade, multiform alumina. Consequently, to study prospects for production of high-grade aluminium.
Since 1984, Germany scientists H.Gleite Nano-alumina powder is prepared for the initial time given that researchers all over the world began on the preparation of nanometer alumina powders by a broad and deep research, presents various preparation procedures. At present, high-purity alumina powders ready by pyrolysis, pyrolysis of ammonium aluminium carbonate hydroxide ammonium aluminum sulfate, liquid phase deposition, sol-gel, and organic aluminum alkoxide strategy.
Hydrochloric acid ammonia generating higher purity alumina powder
On analysis of earlier operate and comparison in the many solutions of study on preparation of high-purity alumina powder around the basis of new preparation system is proposed, namely ammonia hydrochloride preparation of high-purity alumina powder.
Hydrochloride ammonia water preparation high pure alumina powder is will industrial aluminum hydroxide or partial aluminum acid sodium and hydrochloride Yu sealed of reaction slot inside reaction, get three chloride aluminum remedy; 3 chloride aluminum option filter Hou, by evaporation, and Crystal generated has six water three chloride aluminum Crystal; six water three chloride aluminum Crystal in hydrogen chloride gas of protection Xia high temperature dehydration, get no water 3 chloride Aluminum powder, three chloride Aluminum powder in vacuum furnace within for sublimation purification, get purity more than 99.999% of 3 chloride aluminum; high pure 3 Qi of aluminum dissolved Yu ammonia remedy, soon after concentrated, and Upon crystallization, filtration, drying, high-purity aluminum hydroxide crystals; aluminum hydroxide crystals at higher temperature calcined later became the purity of 99.999%, with an average particle size of 0.three ?? m, surface area 21 high-purity alumina powder.
Relative towards the hydrochloric acid ammonia, at present the main production method of high-purity alumina thermal decomposition and organic aluminum alkoxide solution there's a complex procedure, technical situations and hard to control, larger charges and serious shortcomings, such as pollution. As China's financial development, higher purity alumina demand will continue to enhance, while the production of environmental requirements are going to be higher and higher, green and effective preparation of high pure hydrochloric acid ammonia alumina production technologies will probably be widely employed.
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