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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

Inactive Publication Date: 2006-12-13
娄进
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of using a settling tank is: the bottom flow has a large liquid-solid ratio, which is not conducive to Na 2 O and Al 2 o 3 recovery; polymer flocculants must be added, which is costly and has an impact on subsequent processes; in the process flow, more equipment is used, which is not conducive to production control; long residence time, Al 2 o 3 Large hydrolysis loss

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[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). Press the filter plate tightly first, use P=0.6Mpa, Q=200m 3 / h centrifugal pump to input the diluted pulp (solid phase content 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 stops after about 3 minutes Feed, and then use 5kG compressed air to blow into the diaphragm to squeeze the attached liquid in the filter cake, and the separation process is completed at this time. Then stop compressing the air, empty it, the diaphragm shrinks naturally, a certain space is formed between the filter cake and the diaphragm, and a centrifugal pump is used to send 90°C hot water into the cavity formed by the diaphragm and the filter cake, and stop the water after about two minutes. Then use ...

Embodiment 2

[0011] Example 2 Separation and washing of red mud with flat plate vacuum filter press

[0012] Equipment selection 30m 2 Rotary disk vacuum filter press (HDZP-30-00), this equipment is mainly composed of filter surface, screw unloading device, vacuum system and back blowing system. First open the valve of the vacuum system to connect the vacuum pump to the system, then turn on the unloading screw motor, and use the centrifugal pump to feed the diluted pulp to the filter (about 50m 3 / h), adjust the adjusting 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 after the sodium oxide content of the filter cake is qualified, you can enter the next process. The separation, washing, filter cloth regeneration and slud...

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PUM

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Abstract

The invention provides the preparing method of aluminum oxide, comprising preparing ore pulp, digest, diluting ore pulp, separating and washing red mud, disassembling seed crystal, separating and washing aluminum hydroxide, calcining aluminum hydroxide, evaporating mother liquid and causticizing soda solution. The invention adopts pressing filter to replace hydro-separator at the course of separating and washing red mud. The method is in favor of the reclamation of Na2O and Al2O3, and the invention has the advantages of saving cost, short process flow and little apparatus.

Description

technical field [0001] The utility model relates to a method for producing alumina, in particular to a method for separating and washing red mud in alumina production. Background technique [0002] At present, the Bayer process is used to produce alumina. Alkali (NaOH) is used to dissolve the alumina hydrate in the aluminum ore into a water-soluble sodium aluminate solution. Impurities such as iron and titanium in the aluminum ore and most of the silicon Then it becomes an insoluble compound, and the residue of the insoluble compound (it is red because it contains iron oxide, so it is called red mud) is separated from the solution, washed and discarded or comprehensively utilized. The refined pure sodium aluminate solution is decomposed to precipitate aluminum hydroxide, and alumina can be obtained through separation, washing and calcination. The sodium aluminate slurry leached from bauxite is composed of sodium aluminate solution and red mud, which must be separated to obt...

Claims

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Application Information

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IPC IPC(8): C01F7/06B01D25/12C01D1/02
Inventor 娄进
Owner 娄进
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