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A deep purification process of high-concentration sodium aluminate solution

A technology of deep purification and solution purification, which is applied in the field of aluminum metallurgy and can solve problems such as the removal of impurities in sodium aluminate solution and deep purification

Active Publication Date: 2016-04-27
河南能源集团研究总院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a deep purification process for sodium aluminate solution, which has Low cost, simple process, environment-friendly, etc.

Method used

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  • A deep purification process of high-concentration sodium aluminate solution

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Embodiment 1

[0023] The deep purification process of the high-concentration sodium aluminate solution of the present embodiment is as follows:

[0024] (1) One-stage solution purification: take industrial high-concentration sodium aluminate solution, alkali concentration (taken as Na 2 O meter), the alumina concentration is 150g / L, 165g / L respectively. After adding 5mL / L hydrogen peroxide with a concentration of 20% at 90°C and reacting, the positive electrode is connected with direct current and the voltage is 5V, and the electrophoresis principle is used to enrich the iron-containing hydroxide colloid for 30min, then add 10g / L quicklime, stir vigorously for 1h, and then add 2ml / L of 1‰ hydroxamic acid-containing flocculant HX300, flocculation and sedimentation for 1 hour, suction filtration to obtain a section of purified clear liquid;

[0025] (2) Second-stage solution purification: Add 0.5g / LNa to the first-stage purification solution at 70°C 2 S, 1g / LNa 3 PO 4 , 2g / LNaF, add activ...

Embodiment 2

[0028] The deep purification process of the high-concentration sodium aluminate solution of the present embodiment is as follows:

[0029] (1) One-stage solution purification: take industrial high-concentration sodium aluminate solution, alkali concentration (taken as Na 2 O meter), the alumina concentration is 172g / L, 185g / L respectively. Add 20% hydrogen peroxide 2mL / L and 2g / L sodium peroxide as oxidants at 90°C, connect the positive electrode with direct current, voltage 2V, time 30min, use the principle of electrophoresis to enrich the iron-containing hydroxide colloid, and then heat the solution to 100°C, add 10g / L quicklime and stir vigorously for 1h, then add 5ml / L 1‰ polyacrylamide flocculant KM800 (French Essen Company), flocculate and settle for 1h, then suction filter to obtain a purified clear liquid;

[0030] (2) Second-stage solution purification: add 1g / L Na to the first-stage purification solution at 50°C 2 S, 3g / LNa 3 PO 4 , 6g / LNaF, 4g / L sodium carbonate...

Embodiment 3

[0033] The deep purification process of the high-concentration sodium aluminate solution of the present embodiment is as follows:

[0034] (1) One-stage solution purification: take industrial high-concentration sodium aluminate solution, alkali concentration (taken as Na 2 O meter), the alumina concentration is 131g / L, 142g / L respectively. Add 10g / L sodium peroxide and 10g / L sodium persulfate at 90°C, connect the positive electrode with direct current, voltage 20V, time 10min, use the principle of electrophoresis to enrich the iron-containing hydroxide colloid, then raise the temperature of the solution to 95°C and add 10g / L quicklime, stir vigorously for 1 hour; then add 5ml / L 1‰ polyacrylamide-containing flocculant KM800 (French Eisen Company) and hydroxamic acid-containing flocculant HX300 (American Cytec Company), flocculate and settle for 1 hour and pump Filter to obtain a section of purified clear liquid;

[0035] (2) Second-stage solution purification: add 0.1g / L Na ...

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Abstract

The invention discloses a deep purification process of a high-concentration sodium aluminate solution. The industrial sodium aluminate solution is used as a raw material, an electric field is applied, an oxidant is added, impurities such as iron are formed into insoluble precipitates, and organic matter is removed; then lime is added to remove Silicon, to generate hydrated garnet, the newly formed hydrated garnet absorbs the above-mentioned impurities, add flocculant, further remove iron, silicon and organic matter in the solution, and obtain a purified solution; in a purified solution, add a precipitant, Then add an adsorbent, filter after standing still, and obtain the second-stage purification solution; carry out deep filtration on the second-stage purification solution, and insert a macroporous anion resin into the filter to obtain a high-purity sodium aluminate solution. The present invention can achieve low cost and high efficiency , Environmentally friendly to achieve deep purification of sodium aluminate solution.

Description

technical field [0001] The invention belongs to the technical field of aluminum metallurgy, and in particular relates to a deep purification process of high-concentration sodium aluminate solution. Background technique [0002] Bauxite is dissolved with circulating mother liquor for alumina production to obtain sodium aluminate solution. Bauxite impurities enter the solution during the dissolution process. After long-term circulation, there are many types of impurities (such as inorganic substances and organic substances) and relatively high concentrations in the solution. . For example: the organic carbon content in the solution can reach 15g / L, Fe 2 o 3 0.1g / L, SiO 2 1.5g / L, Li0.22g / L, Zn0.1g / L. In particular, inorganic impurities, due to the small amount of precipitates, cannot form large particle precipitates, and are difficult to remove by filtration, so it is difficult to remove impurities. These impurities not only reduce the purity of alumina products and seriou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02
Inventor 刘桂华张建平李小斌刘焦萍齐天贵曹国喜彭志宏李壮周秋生李峰杰陈湘根范颂歌蒋元力
Owner 河南能源集团研究总院有限公司
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