Production method for alumina
A production method and alumina technology, applied in chemical instruments and methods, separation methods, alkali metal oxides, etc., can solve problems such as unfavorable production control, high liquid-solid ratio of underflow, and influence on subsequent processes, so as to facilitate production control, The effect of short residence time and reduced labor intensity
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[0009] Example 1 Separation and washing of red mud with a vertical filter press
[0010] Equipment selection 60m 2 Vertical automatic filter press (HDLY / 3-60-00). First press the filter plate tightly, use P=0.6Mpa, Q=200m 3 / h centrifugal pump feeds the diluted pulp (solid phase contains about 100g / L) into the filter press, the liquid phase in the suspension flows out through the filter cloth, and the solid phase is trapped on the filter cloth to form a filter cake, which will stop after about 3 minutes Feed the material, and then use 5kG compressed air to blow into the diaphragm to squeeze the attached liquid in the filter cake. At this time, the separation process is completed. Then stop the compressed air, evacuate, the diaphragm naturally shrinks, and a certain space is formed between the filter cake and the diaphragm. A centrifugal pump is used to send 90°C hot water into the cavity formed by the diaphragm and the filter cake, and the water supply is stopped after about two m...
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[0011] Example 2 Separation and washing of red mud with a flat plate vacuum filter press
[0012] Equipment selection 30m 2 Rotary vacuum filter press (HDZP-30-00), this equipment is mainly composed of filter surface, screw discharge device, vacuum system and back blow system. First open the vacuum system valve to connect the vacuum pump to the system, then open the unloading screw motor, use the centrifugal pump to feed the diluted slurry to the filter (about 50m 3 / h), adjust the adjustment handwheel on the hopper to make the slurry form a uniform filter cake on the surface of the filter disc. After the filter rotates for a week, turn on the washing pump to add water to the material for washing, and at the same time turn on the compressed air to regenerate the filter cloth. Repeat the above process, and enter the next process after the sodium oxide content of the filter cake is qualified. The separation, washing, filter cloth regeneration, and sludge discharge of the entire dilu...
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