Method for preparing activated alumina by using aluminum industry surface treatment solid waste

Abstract

The present invention relates to a method for preparing activated alumina using surface treatment solid waste from the aluminum industry. The preparation method of activated alumina includes the following steps: 1) Wash the aluminum solid waste with water to remove impurities; 2) Add dilute hydrochloric acid solution and triethanolamine solution to the aluminum solid waste to adjust the pH value to make the alumina particles Recrystallize; 3) Dry and pulverize the aluminum solid waste, add surfactant, and grind to micron level using a colloid mill to obtain material A; 4) Mix material A with cellulose acetate and pore expander, and place Prepare spherical particles in a disc rolling ball machine; 5) hydrothermally treat the spherical particles, and then wash them with low-molecular alcohols to obtain material B; 6) dry material B in an oven, and then calcine it in a muffle furnace. Cool to room temperature naturally and get it. The prepared activated alumina not only has a large specific surface area, pore volume, and reasonably distributed pore sizes, but also has 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