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Method for producing sandy alumina through decomposing seeds in low concentration

An alumina, low-concentration technology, applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, climate change adaptation, etc., can solve the problem that the decomposition technical conditions of alumina plants cannot meet the requirements of low-concentration decomposition, etc. achieve good strength

Inactive Publication Date: 2007-08-01
GUIYANG AL-MG DESIGN & RES INST
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Problems solved by technology

[0005] In view of the characteristics of this low-concentration solution, the existing decomposition technical conditions of the alumina plant cannot meet the requirements of this low-concentration decomposition

Method used

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  • Method for producing sandy alumina through decomposing seeds in low concentration

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Embodiment Construction

[0013] Embodiments of the present invention: Na in the semen sent from the settling workshop 2 o K Concentration 90~100g / l, Al 2 o 3 The concentration is 80-90g / l, mixed with the fine seeds of the plate and frame filter press according to the slurry solid content of 80-120g / l, and then added to the first stage of decomposition tank. The decomposition time of the fine seed agglomeration stage is 9 hours, and the first tank The temperature is 71°C, the solid content in the first tank is 80-120g / l, and the final decomposition temperature is 49°C. Then the temperature is lowered to 60°C through a wide channel plate heat exchanger, and the cooled aluminum hydroxide slurry enters the second stage for decomposition. The second stage is the crystal growth stage, and the decomposition time is 39 hours. The solid content of the tank is 300-400g / l, and the final decomposition temperature is 49°C. A hydrocyclone classifier is installed on the rear section of the second decomposition t...

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Abstract

A process for preparing sandy alumina by decomposing low-concentration seed includes such steps as mixing the refined liquid from settling workshop with the fine seeds from plate-and-frame filter press, stage-one decomposing, stage-two decomposing, classifying by hydraulic cyclone bed, filtering part of bottom stream to obtain finished product, filtering the rest to obtain seeds, filtering overflow liquid to obtain fine seeds, adding fine seeds to the stage-one decomposing reactor, adding coarse seeds to the stage-two decomposing reactor, and heat exchange between mother liquid and refined liquid.

Description

Technical field: [0001] The invention relates to a method for producing sandy alumina by decomposing low-concentration seeds. Background technique: [0002] Seed decomposition is one of the important processes in the production process of Bayer process alumina. Its task is to precipitate aluminum hydroxide from the supersaturated sodium aluminate solution by controlling the seed separation conditions, and the aluminum hydroxide obtained from the decomposition can be used for subsequent Process processing. [0003] Due to the different bauxite processed by the alumina plant, the dissolution conditions are different, and the composition of the obtained sodium aluminate solution is also different. Generally speaking, domestic alumina plants that process diaspore and gibbsite, after dissolution, The concentration of alkali and alumina in the semen obtained by leaf filtration is relatively high, generally Na 2 o K Concentration 145~172g / l, Al 2 o 3 The concentration is 160-1...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/14
CPCY02A40/28
Inventor 陈德徐树涛
Owner GUIYANG AL-MG DESIGN & RES INST
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