Method for preparing nano macroporous low-density spherical aluminum oxide by acid-base electrochemical double strings
A spherical alumina and aluminum hydroxide technology, applied in the preparation of alumina/aluminum hydroxide, alumina/hydroxide, etc., can solve the problems of difficult removal of impurities in aluminum salt solution, equipment corrosion and wear, and high decomposition heat consumption. , to achieve the effect of reducing the difficulty of impurity removal, reducing the degree of equipment corrosion, and shortening the process route
Inactive Publication Date: 2021-02-05
中纳电子科技连云港有限公司
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Patent CN200710010917.X discloses a method for producing alumina by sulfuric acid method combined with Bayer method to treat bauxite with low aluminum-silicon ratio; patent CN201010161876.6 discloses a method for producing alumina by fly ash hydrochloric acid method; A method for producing alumina by hydrochloric acid leaching of bauxite extraction and iron removal; patent CN201110452728.4 discloses a subsequent treatment method for aluminum sulfate in the process of extracting alumina from fly ash; patent 201210102803.9 discloses a method using low A method for preparing alumina by acid leaching of high-grade bauxite; the above-mentioned disclosed acid method for producing alumina has the following main problems: (1) It is difficult to remove impurities in the aluminum salt solution, and it is dissolved under high-temperature concentrated acid conditions. Dissolution, iron, potassium, sodium, calcium, magnesium, lithium, titanium and some rare metals will be dissolved accordingly, how to remove impurities economically and effectively becomes the key; (2) The equipment is severely corroded and worn, especially the dissolution tank, heat exchanger, evaporation (3) High cost: the decomposition of various aluminum salts (aluminum sulfate, aluminum chloride, aluminum nitrate) consumes a lot of heat. Take the pyrolysis of aluminum chloride hexahydrate to produce alumina as an example , and its heat consumption is about 4 times that of aluminum hydroxide pyrolysis to produce alumina
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[0025] Such as figure 1 As shown, a method for preparing nano-macroporous low-density spherical alumina by acid-base electrochemical double strings comprises the following steps:
[0026] Step S1: Purify by alkali method to obtain high-purity soluble aluminum hydroxide, the concentration of cationic impurities in the aluminum hydroxide reaches the ppm level, Na+≤20ppm, Ca2+≤20ppm, and the mass fraction of the aluminum hydroxide is 29%-31% Prepare aluminum salt solution in hydrochloric acid;
[0027] Step S2: Add 4N-5N high-purity aluminum ingots obtained by the electric purification method to the aluminum salt solution prepared in step S1. The reaction uses autothermal polymerization to obtain a high-purity polyaluminum chloride solution. No external heat is required. Since metal aluminum High purity and good reactivity, the polyaluminum chloride solution produced by the reaction has a very high concentration of alumina ions, which can avoid the formation of other impurity io...
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The invention discloses a method for preparing nano macroporous low-density spherical aluminum oxide through acid-base electrochemical double strings, belongs to the field of inorganic matter preparation, greatly reduces the impurity removal difficulty, improves the product purity, and reduces the energy consumption and the equipment corrosion degree. Easily soluble aluminum hydroxide is obtainedthrough an alkaline purification method, hydrochloric acid is added to prepare a high-purity aluminum trichloride solution, then a high-purity aluminum ingot is added, a reaction exothermic polymerization reaction is utilized to obtain a high-purity polyaluminum chloride solution, pressurization and heating are not needed in the process, the polymerization reaction is easy to carry out, and then ammonia water is added to a generated solution to adjust the pH value togradually separate out aluminum hydroxide in the solution; and countercurrent washing and liquid-solid separating are performed after the aluminum hydroxide is completely precipitated in the solution, by adding SAA in the process, the hydrophobic property of the filtrate is improved, and low-density double-pore-structure large-pore-volume r spherical activated aluminum oxide and original crystal nano easy-to-sinter alpha aluminum oxide are generated in the subsequent drying and calcining process.
Description
technical field [0001] The invention belongs to the field of preparation of inorganic substances, and in particular relates to a method for preparing nano-macroporous low-density spherical alumina by acid-base electrochemical double strings. Background technique [0002] With the advancement of modern science and technology, especially the rapid development of aerospace technology, the use of large-scale atomic energy and the emergence of emerging industries such as ocean development, industrial production has put forward higher and higher requirements for structural materials. In many respects, traditional metal or alloy materials have been difficult to meet the needs of practical applications. Alumina is one of the basic materials in the high-tech field. Because of its high melting point, high hardness, insulation and heat resistance, it has been widely used in aerospace, nuclear energy, energy, metallurgy, electronics, biochemistry, chemical engineering, etc. project. H...
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IPC IPC(8): C01F7/02C01F7/30
CPCC01F7/02C01F7/30
Inventor徐伟王学诗
Owner中纳电子科技连云港有限公司