Preparation method for high-quality aluminum oxide for preparing high-purity aluminum and application of high-quality aluminum oxide
An alumina, high-quality technology, applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, chemical instruments and methods, aluminum compounds, etc., can solve problems such as unsatisfactory aluminum product purity
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[0021] The preparation method of high-quality alumina in the embodiment of the present invention adopts the Bayer method to dissolve bauxite, including: pulp grinding, pulp dissolution, red mud separation, crude liquid refining, seed crystal decomposition and roasting to obtain alumina;
[0022] The above pulp grinding is to add liquid caustic soda into the bauxite and carry out grinding treatment to obtain the pulp.
[0023] The above pulp is dissolved at a certain temperature to obtain a slurry, and then diluted; the embodiment of the present invention adopts 130-150°C, which belongs to low temperature dissolution.
[0024] After the above slurry is diluted, the red mud is separated. The diluted pulp is flocculated and settled in the red mud separation and settling tank, and the liquid and solid are separated to obtain crude liquid and red mud. The crude liquid is filtered to obtain filter cake and semen, and the crude liquid is refined.
[0025] Adding seeds to the semen ob...
Embodiment 1
[0033] figure 1 It is a schematic flow chart of a preparation method for producing high-quality alumina using a typical Bayer process in an embodiment of the present invention. It includes in turn: pulp grinding, pulp dissolution, slurry dilution, sedimentation separation, crude liquid refining, seed crystal decomposition, AH (aluminum hydroxide) filtration, washing and AH roasting to obtain alumina.
[0034] In this embodiment, the temperature for the dissolution of the ore pulp, the concentration of the refined solution, and the conditions for the decomposition of the seed crystals are restricted, and the process of removing V and Ga is added, as follows:
[0035] The dissolution temperature is 140°C, the refined solution alumina concentration is 165g / l, the seed decomposition solid content is 600g / l, the decomposition time is 38h, the decomposition end temperature is 60°C, and the circulating seed particle size is -45μm 12%. A part of the decomposed mother liquor is divert...
Embodiment 2
[0037] Present embodiment technique is similar to embodiment 1, and difference is: stripping temperature and seed decomposition system parameter, specifically are:
[0038] The low-temperature Bayer method is used for dissolution, and the dissolution temperature is 130°C;
[0039] Process conditions for controlling the seed decomposition process: the concentration of alumina in the refined solution is 145g / l, the solid content is 400g / l, the final temperature is 55°C, the time is 20h, and the particle size of the seed is -45μm10%;
[0040]Control the impurity content of the refined liquid: Ga90ppm, V250ppm, and decompose the mother liquor to remove V or Ga; the mother liquor after V (vanadium) or Ga removal enters the pulp grinding step again.
[0041] Alumina obtained by roasting: Fe 2 o 3 60ppm, Ga 2 o 3 30ppm, MnO 4ppm, V 2 o 5 5ppm, ZnO 3ppm, the purity is 99.94%.
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Abstract
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