Flow separation and leaf filtration process for red mud settlement separating coarse liquid and red mud washing liquid and system therefor
A technology of sedimentation separation and splitter leaves, which is applied in sludge treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. It can solve the loss of hydrolysis, increase the load of the red mud separation and sedimentation tank, and reduce the power consumption of the dissolved slurry. Stability and other issues, to achieve the effect of improving stability, reducing hydrolysis loss, and reducing load
Active Publication Date: 2011-07-27
SHENYANG ALUMINIUM MAGNESIUM INSTITUTE
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However, since the dilution of the stripping slurry reduces the stability of the solution, Al 2 o 3 hydrolysis loss, and will also increase the load of the red mud separation and settling tank and the power consumption of transporting the dissolved slurry
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[0015] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.
[0016] Such as figure 1 As shown, the separation leaf filtration process of red mud sedimentation and separation of crude liquid and red mud washing liquid in the present invention includes the following steps: directly sending the slurry in the dissolution slurry tank 1 into the red mud separation and settlement tank 3; separating and sedimentation of the red mud The bottom flow separated in the tank 3 is sent to the red mud primary washing settling tank 5, and the separated overflow is sent to the crude liquid tank 7; the crude liquid in the crude liquid tank 7 is sent to the sodium aluminate solution leaf filter 9; The semen filtered by the sodium solution leaf filter 9 enters the leaf filter semen tank 14, and the filter cake enters the leaf filter cake tank 15; the overflow lotion in the red mud primary washing settling tank 5 is sent to the red mud...
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The invention relates to a flow separation and leaf filtration process for red mud settlement separating coarse liquid and red mud washing liquid, and a system therefor. The flow separation and leaf filtration process comprises the steps as follows: slurry in a leached slurry tank is directly sent into a red mud separation settling tank; base flow separated by the separation settling tank is sent to a red mud one-time washing settling tank, and over flow separated is sent to a coarse liquid tank; the coarse liquid in the coarse liquid tank is sent into a leaf filter for sodium aluminate solution; fine liquid through the leaf filtration of the leaf filter for sodium aluminate solution enters a leaf filtration fine liquid tank, and filter cakes enter a leaf filtration filter cake tank; the washing liquid in the red mud one-time washing settling tank is sent into a red mud washing liquid tank; the washing liquid in the red mud washing liquid tank is sent into a leaf filter for the red mud washing liquid; and the fine liquid through the leaf filtration of the leaf filter for the red mud washing liquid enters the leaf filtration fine liquid tank, and the filter cakes enter the leaffiltration filter cake tank. The process improves the stability of solution in the red mud settlement separating operation, reduces the hydrolysis loss of Al2O3, can maintain proper supersaturation of the fine liquid, and also cancels the leached slurry diluting operation process.
Description
technical field [0001] The invention relates to a process and system of leaf filtration, in particular to a "red mud sedimentation separation of crude liquid and red Separation leaf filtration process and system for mud washing liquid", which is suitable for occasions where the concentration of caustic alkali in the dissolution slurry is medium to low concentration, and belongs to the technical field of alumina production. Background technique [0002] In the process of alumina production, the role of the sodium aluminate solution leaf filtration process is to reduce the floating matter in the semen in the decomposing process, so as to meet the requirements of product quality for semen quality. In the production process of Bayer process alumina, due to the Na in the slurry after dissolution 2 o k High concentration and high viscosity are not conducive to subsequent decomposition operations, so it must be diluted to increase the supersaturation of the solution. The process...
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IPC IPC(8): C02F11/00
Inventor 王丽娟廖新勤陈国华
Owner SHENYANG ALUMINIUM MAGNESIUM INSTITUTE