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Process for removing organics from sodium Bayer process aluminate solution

A Bayer process sodium aluminate and organic matter technology, applied in the purification of aluminate/alumina/aluminum hydroxide, preparation of alkali metal aluminate/alumina/aluminum hydroxide, etc. problems such as poor performance and complex process, to achieve the effect of increasing the discharge of three wastes, large-scale production, and simple process

Inactive Publication Date: 2007-01-31
HUIYUAN CHEM IND CO LTD PINGDINGSHANCITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Above-mentioned all methods, complex process, low efficiency (according to the report, removal rate only reaches 40% at best), poor economy; Can not adapt to removing organic matter from the precision solution after Bayer process sodium aluminate solution ultra-deep desilication reaction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The ore pulp dissolved by Bayer process diaspore type bauxite, after separation of red mud, precision filtration, adjustment of component concentration, and desiliconization reaction, the sodium aluminate solution whose index meets the following index requirements is used as raw material:

[0022] SiO 2 Content 0.00014~0.00018g / L; Al 2 o 3 25~35g / L; organic matter (in C 2 o 4 2- Total) 0.01 ~ 0.05g / L; suspended matter content 1 ~ 2ppm;; Na 2 o c 1~2g / L; Fe 2 o 3 0.1~0.2ppm; caustic ratio 1.3~1.4.

[0023] The calcium oxide is calcium oxide calcined by chemically precipitated calcium carbonate, and the effective CaO content is 80-85%;

[0024] Calcium oxide with a diameter of 0.1-0.2mm is added, and the addition amount is 2-3g / L; at 80-85°C, the stirring speed is 40-60rpm, and the reaction is 60-80min for replacement and adsorption reactions. After calcium oxide is put in, it is quickly digested from the outside to the inside on its surface; a large amount o...

Embodiment 2

[0029] Example 2 SiO 2 0.00014~0.00018g / L; Al 2 o 3 35~45g / L; organic matter (in C 2 o 4 2- Total) 0.01~0.04g / L; Suspended matter 2~3ppm; Na 2 o c 3~4g / L; Fe 2 o 30.3~0.4ppm; causticity ratio 2.4~2.5; add φ0.2~0.3mm chemical precipitated calcium carbonate calcined calcium oxide, effective CaO content 85~90%; addition amount 4~5g / L; at 85~90℃, stir The speed is 70-90rpm, and the reaction is 80-100min; the obtained solid slag containing organic matter contains C 2 o 4 2- Reach ≥048%, C in solution 2 o 4 2- Reduced to ≤0.01g / L, the clearance rate was 70.3%; the rest were the same as in Example 1.

Embodiment 3

[0030] Example 3 SiO 2 0.00018~0.00022g / L; Al 2 o 3 80~85g / L; organic matter (in C 2 o 4 2- Total) 0.09~0.1g / L; suspended matter 9~10ppm; Na 2 o c 14~15g / L; Fe 2 o 3 0.9~1.0ppm; causticity ratio 1.7~1.8; calcium oxide is calcium oxide calcined from pure limestone, effective CaO content is 90~95%; calcium oxide φ0.9~1.0mm is added, and the addition amount is 7~8g / L; at 95 ~100℃, stirring speed 180~200rpm, reaction 220~240min; solid slag contains C 2 o 4 2- ≥0.55% C in solution 2 o 4 2- Reduced to ≤0.01g / L, the clearance rate was 77.8%. All the other are the same as embodiment one.

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Abstract

The present invention relates to the preparation of chemical intermediate. It is a technological process of removing organics from Bayer process sodium aluminate solution. The sodium aluminate solution material, which is obtained through leaching out from diaspore type bauxite, separation of red clay, precision filtering, regulation of components and desilication, has its organics removed through addition of calcium oxide of 0.1-1.0 mm size to react for 60-240 min and liquid-solid separation. The present invention has a elimination rate of 70-80% and is especially suitable for preparing pseudo-thin diasphore from deeply desilicifcated Bayer process sodium aluminate solution.

Description

[0001] Technical field The present invention belongs to the preparation method of inorganic compound intermediate, relate in particular to a kind of technique of removing organic matter from Bayer process sodium aluminate solution. Background technique [0002] Bauxite for the production of alumina by the Bayer process, regardless of the type of mineral, contains a small amount (a few parts per thousand to a few parts per ten thousand) of organic impurities; during the high-temperature dissolution process, humic acid organic matter reacts with lye to form various humic substances. The sodium salt of sodium oxalate is dissolved into the sodium aluminate solution; it accumulates in the production process and is gradually decomposed from high molecular compounds to form sodium oxalate (potassium) and aluminum carbonate complexes. Many research results in the world have shown that the content of organic matter in the Bayer process sodium aluminate solution reaches a certain concent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/47
Inventor 刘作霖杨根水冯运伟
Owner HUIYUAN CHEM IND CO LTD PINGDINGSHANCITY
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