Red mud on-line comprehensive treatment method

Abstract

The invention relates to a red mud on-line comprehensive treatment method. The scheme of the method comprises the following steps: directly discharging red mud slurry produced in an aluminium oxide factory into a stirring device with a heat-insulating property through a slurry inlet, then adding acetylene sludge of which the mass fraction is 10-30% to be used as an additive through a feeding opening, stirring under the condition that the stirring strength is 100-500 r/min for 60-360 min, performing still standing for 5-10 min after finishing stirring, then discharging a supernatant from an overflow pipe of the stirring device, discharging bottomflow into a filter press through a slurry outlet to be subjected to filter pressing, mixing a filtrate and the supernatant, and conducting next alkali recycle operation through 001*7 resin adsorption. Tailings are used for preparing building materials, and the red mud on-line dealkalization and the improvement of the activity of the tailings after the dealkalization are realized. The method has the characteristics that the process is simple, the dealkalization rate is high, the energy consumption is low, and the dealkalized red mud can meet requirements on building material preparation.

Description

technical field [0001] The invention belongs to the technical field of red mud comprehensive treatment, and in particular relates to an online comprehensive treatment method of red mud. Background technique [0002] Red mud is the tailings produced during the production of alumina from bauxite. It is called red mud because it contains a certain amount of hematite and turns red. The Bayer process for extracting aluminum has been widely used by alumina refineries at home and abroad because of its low energy consumption and good benefits. Red mud from the Bayer process is an alkaline pollution source with complex mineral composition and chemical composition. Stockpiling red mud and building dams will not only cause groundwater and soil pollution, but also cause air pollution due to the extremely fine particle size of red mud, so effective measures must be taken to deal with this type of solid waste. The high alkali content and low gelling active components in red mud are the ...

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Problems solved by technology

[0003]Water elution and alkali removal process (Zhang Guoli, Li Shaochun, Zhang Xinyuan, etc. Research on water elution and alkali removal process of red mud by Bayer process. Journal of Qingdao University of Technology, 2012, 33(4) : 59-62) There are defects such as high liquid-solid ratio, many washing times, long soaking time, no online dealkalization, low activity of red mud after treatment, and cannot directly prepare building materials, etc.

[0004]Carbonation dealkalization process (Wang Zhi, Han Minfang, Zhang Yihe, etc. Research on wet carbonation dealkalization process of Bayer process red mud. Silicate Bulletin, 2013, 32 ( 9): 1851-1855) There are defects such as pressure leaching has strict requirements on the shock resistance and compression performance of leaching equipment, low dealkalization rate, and low activity of red mud after treatment.

[0005]Acid leaching neutralization method dealkalization process (Zhong Chen, Xia Jupei. Experimental study on the leaching of Na+ in Bayer red mud. Silicate Bulletin, 2013, 32(9): 2012-2015) has defects such as large acid consumption in the process of dealkalization, acidity of red mud after treatment and secondary pollution

[0006] Lime dealkalization process (Li Shaokang, Liang Chunlai, Li Guangzhu, etc. A Bayer process red mud dealkalization method at atmospheric pressure, invention patent, 2004; Luo Zhongtao, Xiao Yu Ling, Zhang Lei, etc. Red mud slurrying multi-stage circulation dealkalization and alkali recovery treatment process. Journal of Jinan University, 2013, 4(27): 369-372.) There is a problem that dealkalization cannot be done online, and high temperature leaching is required in the dealkalization process , high energy consumption and other defects

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