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A kind of Bayer process co-production chemical alumina production method

A production method and chemical technology, which are applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, etc., can solve the problems affecting the production increase and circulation efficiency of the Bayer process, and the weak production system of the production system.

Active Publication Date: 2021-09-17
湖南绿脉环保科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Now in the alumina industry, in order to solve the problem of hydrolysis in the sedimentation system, the molecular ratio of the dissolved slurry in the dissolution step should not be too low to reduce hydrolysis, but a high molecular ratio of the dissolved slurry will seriously affect the production increase and circulation of the Bayer process Efficiency, this contradiction has become the bottleneck problem of the weak productivity of the alumina Bayer process production system

Method used

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  • A kind of Bayer process co-production chemical alumina production method
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  • A kind of Bayer process co-production chemical alumina production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A alumina production enterprise A, according to figure 1 The process flow shown is produced. Process parameters are as follows:

[0025] Dissolved slurry: 200M 3 / h, NK 260g / L, αk 1.41, red mud A / S1.21;

[0026] Red mud, washing liquid: NK 58g / L, αk 1.59, 180m 3 / h;

[0027] Dilution dearse tank: NK 165g / L, αk 1.45;

[0028] Red Music Separation Substanting Coverter: NK 166G / L, αk 1.55;

[0029] Abandon Red Mud: A / S1.25;

[0030] Bayer method: αk 1.48.

[0031] According to the method of the present invention, improved process flow charts image 3 As shown, the specific improvement is as follows:

[0032] The filtration of the filtration after the carbon fraction in the proposed thin aluminum stone production system is causing the lime millet to NK is 21 g / L, obtain a caustic liquid, and then send the caustic liquid to the mud layer of the sink groove. The lower part, 40m is added at 5 3 / h, after the red mud bottom flow of the sink groove, the red mud is was...

Embodiment 2

[0045] A alumina production enterprise B, according to figure 1 The process flow shown is produced. Process parameters are as follows:

[0046] Dissolved slurry: 320M 3 / h, NK 280g / L, αk 1.38, red mud A / S1.18;

[0047] Red mud once washing liquid: NK 61g / L, αk 1.57, 300m 3 / h;

[0048] Dilution dearse tank slurry: NK 168G / L, αk 1.42;

[0049] Red mud separation sink bottom ripple: NK 165g / L, αk 1.53;

[0050] Abandoning red mud: A / S1.21;

[0051] Bayer method: αk 1.45.

[0052] According to the method of the present invention, improved process flow charts image 3 As shown, the specific improvement is as follows:

[0053] The filtration of the filtration of the carbon sub-production system in a thin water aluminum stone production system is causing lime milings to 50 g / L to obtain a caustic solution. After the caustic liquid is supplied to the mud layer of the sink groove. A caustic solution 60m is added at 6 3 / h, after the red mud bottom flow of the sink groove, ...

Embodiment 3

[0062] A alumina production company C, according to figure 2 The process flow shown is produced. The parameters are as follows:

[0063] Ultrafine hydroxide washing liquid: NK 60g / L, αk 2.95, 80m 3 / h;

[0064] Dissolved slurry: 520M 3 / h, NK 280g / L, αk 1.38, red mud A / S1.20;

[0065] Red mud once washing liquid: NK 61g / L, αk 1.57, 300m 3 / h;

[0066] Dilution dexerel tank: NK 165g / L, αk 1.40;

[0067] Red mud separation sink bottom ripple: NK 165g / L, αk 1.53;

[0068] Abandoning red mud: A / S1.23;

[0069] Bayer method semen: αk 1.46.

[0070] According to the method of the present invention, improved process flow charts Figure 4 As shown, the specific improvement is as follows:

[0071] The ultrafine hydroxide production system in the ultrafine hydroxide production system is sent to the middle and lower part of the mud layer of the sinking groove, and an ultrafine hydroxide washing liquid is added to 80m. 3 / h, after the red mud bottom flow of the sink groove, t...

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Abstract

The invention relates to the technical field of alumina production, and specifically discloses a method for producing alumina by Bayer process co-production chemicals. The method is to send the causticizing liquid obtained from the pseudo-boehmite production system or the ultra-fine aluminum hydroxide product washing liquid in the ultra-fine aluminum hydroxide production system to the middle of the mud layer of the red mud separation and settling tank to wash the red mud once At any position between the upper part of the settling tank, the causticizing liquid or the superfine aluminum hydroxide product washing liquid enters the red mud primary washing settling tank along with the red mud bottom flow of the red mud separation settling tank. The causticizing liquid or ultra-fine aluminum hydroxide product washing liquid can be digested and absorbed in the Bayer process production system, saving evaporation steam consumption. This method can also effectively solve the hydrolysis problem of sodium aluminate solution in the Bayer process production system. The stripping step can further reduce the molecular ratio of the stripped slurry and improve the cycle efficiency. Therefore, it can effectively solve the bottleneck problem of weak production in the Bayer process production system. Find an ideal way for the Bayer method to save energy, reduce consumption and improve cycle efficiency.

Description

Technical field [0001] The present invention relates to the field of alumina production, and in particular, there is a method of producing aluminum oxide production of Bayer, especially the Bayer method, a thin water aluminum stone production method or Bayer method, ultrafine hydroxide production method. . Background technique [0002] Chemical alumina refers to aluminum hydroxide, alumina, aluminum oxide and aluminum hydroxide produced by alumina, including ultrafine hydroxide, and a thin aluminum stone. Take a thin aluminum stone as an example, a thin aluminum stone is also known as a fake water soft aluminum stone, and a hydroxide-based alumina is a hydroxide series chemical product, which is a water-containing gel. The spatial structure of the proposed thin aluminum stone is a mesh, and the crystal microstructure phase is relatively high; at the same time, it also has strong glue and adhesion; in addition to this, it has a higher specific surface area, well A larger features ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/06C01F7/14
Inventor 陈湘清李森娄世彬陈黎军唐剑
Owner 湖南绿脉环保科技股份有限公司
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