Preparation method for activated aluminum oxide by using aluminum industry surface treatment solid waste

Abstract

The invention relates to a preparation method for activated aluminum oxide by using aluminum industry surface treatment solid waste. The preparation method of activated aluminum oxide comprises the following steps: 1) washing the aluminum material solid waste with water, and removing impurities; 2) adding a diluted hydrochloric acid solution and a triethanolamine solution to the aluminum material solid waste, adjusting the pH value, and making aluminum oxide particles recrystallized; 3) drying the aluminum material solid waste, crushing, adding a surfactant, and grinding into micron grade with a colloid mill, to obtain a material A; 4) mixing evenly the material A with cellulose acetate and a pore-enlarging agent, and placing the mixture in a disc ball rolling machine to prepare spherical particles; 5) carrying out hydrothermal treatment on the spherical particles, and washing with low-molecular alcohol, to obtain a material B; and 6) placing the material B in a drying oven, drying, then placing the obtained material in a muffle furnace, calcining, naturally cooling to room temperature, and thus obtaining the product. The prepared activated aluminum oxide has the advantages of large specific surface area and pore volume, reasonable distribution of pore diameter, and good crushing strength and catalytic activity.

Description

technical field [0001] The invention belongs to the field of preparation of inorganic materials, and in particular relates to a method for preparing activated alumina by using surface treatment solid waste in the aluminum industry. Background technique [0002] Aluminum alloy is the second most used metal structural material after steel. Due to the active chemical properties of aluminum alloy, in order to improve its corrosion resistance and decorative performance, aluminum alloy profiles often require surface treatment. The main processes of surface treatment of aluminum profiles include degreasing, alkali etching, pickling, oxidation, sealing and coloring. In these processes, about 1-2% of aluminum alloy is dissolved in the bath in the form of ions. At the same time, a large amount of liquid will be taken away from the treatment tanks during the processing of aluminum profiles, which requires a large amount of water to clean. According to statistics, about 65-180L of water...

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Problems solved by technology

Chinese patent application 200410014031.9 discloses a method for preparing activated alumina using industrial sludge from an aluminum profile factory. In this method, the industrial sludge from an aluminum profile factory is used as a raw material, and the nitric acid method is used to mix and refine the sludge to make spherical sludge, which is dried and sintered to obtain γ-Al 2 o 3 Activated alumina is crystalline phase, but the specific surface area of ​​activated alumina prepared by this method is 180-450mm 2 / g, the average pore diameter is 3-7nm and the pore volume is 0.15-0.8cm 3 / g, the range fluctuates greatly, which affects its catalytic activity. In addition, due to the formation of nitric acid, a large amount of nitrogen oxides will be produced when drying activated alumina, which seriously pollutes the environment.

Another Chinese patent application 201310336464.5 discloses a method for extracting alumina from aluminum-containing waste slag, the method is to mix coal gangue and / or fly ash with a certain amount of red mud (coal gangue, fly ash and red mud are all (aluminum-containing waste residue) mixed with sodium carbonate, followed by sintering, hydrochloric acid pickling, concentrated hydrochloric acid to crystallize aluminum chloride, ammonia water precipitation to precipitate aluminum hydroxide, and calcining to obtain alumina. However, during hydrochloric acid leaching, Fe, Impurities such as Ca and Mg will dissolve together with Al, which will affect the preparation of alumina and require a complicated impurity removal process