Deep purification technology of high concentration sodium aluminate solution

A purification process and deep purification technology, applied in the field of aluminum metallurgy, can solve the problems of deep purification and difficulty in removing impurities from sodium aluminate solution

Active Publication Date: 2015-07-08
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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  • Deep purification technology 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 / L Na to the first-stage purification solution at 70°C 2 S, 1g / L Na 3 PO 4 , 2g / L NaF, add ac...

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. At 90°C, add 20% hydrogen peroxide 2mL / L and 2g / L sodium peroxide as the oxidizing agent, connect the positive electrode with direct current, voltage 2V, time 30min, use electrophoresis principle 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 / L Na 3 PO 4 , 6g / L NaF, 4g / L sodium ca...

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 technology of a high concentration sodium aluminate solution. The technology adopting an industrial sodium aluminate solution as a raw material comprises the following steps: applying an electric field, adding an oxidant to make iron and other impurities generate insoluble precipitates, and removing organic matters; adding lime to remove silicon in order to generate hydrogarnet for adsorbing the above impurities, and adding a flocculating agent to further remove iron, silicon and organic matters in the obtained solution in order to obtain a first stage purified solution; adding a precipitating agent into the first stage purified solution, adding an adsorbent, standing, and filtering to obtain a second stage purified solution; and carrying out deep filtration on the second stage purified solution by adding macroporous anion resin in order to obtain a highly pure sodium aluminate solution. Deep purification of the sodium aluminate solution can be realized in a low cost, high efficiency and environmental protection manner.

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, Li 0.22g / L, Zn 0.1g / 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 se...

Claims

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Application Information

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Patent Type & Authority Applications(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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