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Method for removing organic matter in sodium aluminate solution by foam separation

A technology of foam separation and sodium aluminate, applied in aluminum compounds, chemical instruments and methods, aluminate/alumina/aluminum hydroxide purification, etc., can solve the problems of high cost, low removal efficiency, poor targeting, etc. Achieving reduced negative effects, high concentration and good foaming properties

Active Publication Date: 2021-11-30
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above problems, the object of the present invention is to provide a high-efficiency, low-cost method for removing organic matter in sodium aluminate solution for the problems of low organic matter removal efficiency, poor pertinence, and high cost of sodium aluminate solution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A kind of foam separation of the present invention removes the method for organic matter in sodium aluminate solution, comprises the following steps:

[0038] (1) Take 1000mL of sodium aluminate solution (Na 2 O 160.23g / L, Al 2 o 3 188.29g / L, α K 1.40; TOC 5g / L).

[0039] (2) At 90°C, add 10 ppm sodium gluconate, foam for 60 minutes, and scrape off the foam continuously to obtain 100 mL of foam, which is the organic matter enrichment solution.

[0040] (3) The concentration of TOC in the remaining sodium aluminate solution is reduced to 2.4g / L, the removal rate of organic matter in the solution reaches 51%, and the concentration of TOC in the enriched solution reaches 16g / L.

Embodiment 2

[0042] A kind of foam separation of the present invention removes the method for organic matter in sodium aluminate solution, comprises the following steps:

[0043] (1) Take 1000mL of sodium aluminate solution (Na 2 O 280g / L, Al 2 o 3 153.5g / L, α K 3.0; TOC15g / L).

[0044] (2) At 70°C, add 30ppm interface adsorption regulator (interface adsorption regulator is a mixture of sodium gluconate and mannitol, wherein the mass ratio of sodium gluconate and mannitol is 3:1), foam for 30min, and Continuously scrape out the foam to obtain 100mL of foam, which is the organic enrichment solution.

[0045] (3) The TOC concentration in the remaining sodium aluminate solution was reduced to 9.1 g / L, the organic matter removal rate reached 42%, and the TOC concentration in the enriched solution reached 31.5 g / L.

Embodiment 3

[0047] A kind of foam separation of the present invention removes the method for organic matter in sodium aluminate solution, comprises the following steps:

[0048] (1) Take 1000mL of sodium aluminate solution (Na 2 O 150g / L, Al 2 o 3 77.12g / L, α K 3.2; TOC 9g / L).

[0049] (2) At 60°C, add 15ppm of interfacial adsorption regulator (interface adsorption regulator is a mixture of sodium tartrate, mannitol and polyethylene glycol, wherein the mass ratio of sodium tartrate, mannitol and polyethylene glycol is 5:1 : 1), foam for 15 minutes, and continuously scrape out the foam to obtain 100mL of foam, which is the primary organic matter enrichment solution. The TOC in the primary organic enrichment solution reached 31.2g / L.

[0050] (3) Bubble 100 mL of the primary organic matter enrichment solution at 60° C. for 5 minutes to obtain 20 mL of the secondary organic matter enrichment solution.

[0051] The TOC concentration in the secondary organic enrichment solution was deter...

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Abstract

The invention discloses a method for removing organic matter in a sodium aluminate solution by foam separation, specifically: adding an interface adsorption regulator, foaming the sodium aluminate solution containing organic matter at 30°C to 100°C to make the sodium aluminate The organic matter in the solution is enriched in the foam; after the foam is separated, the organic matter in the sodium aluminate solution is discharged. The invention can achieve a removal rate of more than 40% of organic matter in the solution, reduce or balance the amount of organic matter in the solution when the Bayer method is used to produce alumina, and has the characteristics of high removal efficiency of organic matter in the solution, less investment, low cost and broad application prospects.

Description

technical field [0001] The invention relates to the technical field of aluminum metallurgy, in particular to a method for removing organic matter in sodium aluminate solution through foam separation. Background technique [0002] During the production of alumina by the Bayer process, a large amount of organic matter in bauxite and some organic matter added in the production process (such as flocculants, defoamers, filter aids, water reducers, etc.) will enter the sodium aluminate solution, After the solution has been circulated for a long time, the total organic carbon (TOC) in the sodium aluminate solution can reach 40g / L. These organic substances will lead to lower alumina yield, lower product quality, higher alkali consumption, odor and a lot of foam. Therefore, the removal of organic matter from sodium aluminate solution has always been a technical problem that the alumina industry needs to solve urgently. [0003] Organic matter in sodium aluminate solution can be div...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/47C01F7/02
CPCC01F7/02C01F7/473
Inventor 刘桂华李小斌齐天贵彭志宏周秋生吴鹏
Owner CENT SOUTH UNIV