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Method of producing aluminium polychloride using aluminium hydroxide mud

A technology of polyaluminum chloride and aluminum hydroxide, applied in aluminum chloride, aluminum halide, flocculation/sedimentation water/sewage treatment, etc., can solve the problems of secondary pollution, waste of land resources, etc. Waste of land resources, beneficial to environmental sanitation

Inactive Publication Date: 2007-04-18
童益
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] In the production process of aluminum materials, pickling wastewater and alkali washing wastewater are generally produced, which are rich in free aluminum ions, and aluminum hydroxide sludge (hereinafter referred to as aluminum-containing sludge) is generated through sewage treatment. This aluminum hydroxide sludge At present, it has not been reused, and it is usually used for landfill treatment, which is easy to form secondary pollution and waste land resources

Method used

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  • Method of producing aluminium polychloride using aluminium hydroxide mud

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Embodiment 1

[0017] The present invention uses the aluminum hydroxide sludge produced in the production of aluminum materials to produce polyaluminum chloride using the following process steps:

[0018] In the present invention, 45% by weight of dilute hydrochloric acid (20% acid content) is added to the reaction tank, 45% by weight of aluminum hydroxide sludge is gradually added, and the reaction is stirred to completely react and dissolve the aluminum hydroxide sludge to gradually generate liquid aluminum trichloride. , Stop heating when the heating temperature reaches 75°C; gradually add 19% by weight of calcium aluminate powder and 1% by weight of defoamer, continue the reaction and dissolve, and gradually increase the temperature to 100°C (boiling); add calcium aluminate powder Then use a precision pH test paper of 0 to 5 to detect the pH value, so that the pH value is controlled at 4.5. If the pH value is less than 4.5, you can continue to add calcium aluminate powder, if it is higher th...

Embodiment 2

[0021] The present invention uses the aluminum hydroxide sludge produced in the production of aluminum materials to produce polyaluminum chloride using the following process steps:

[0022] In the present invention, 50% by weight of waste hydrochloric acid (20% acid content) is added to the reaction tank, 39% by weight of aluminum hydroxide sludge is gradually added, and the reaction is stirred to completely react and dissolve the aluminum hydroxide sludge to gradually generate liquid aluminum trichloride. ; Stop heating when the heating temperature reaches 80°C; gradually add 10% by weight of calcium aluminate powder and 1% by weight of defoamer, continue the reaction to dissolve, and gradually increase the temperature to 105°C (boiling); add calcium aluminate powder Then use a precision pH test paper of 0 to 5 to detect the pH value, so that the pH value is controlled at 4. If the pH value is less than 4, you can continue to add calcium aluminate powder, if it is higher than 4, ...

Embodiment 3

[0025] The present invention uses the aluminum hydroxide sludge produced in the production of aluminum materials to produce polyaluminum chloride using the following process steps:

[0026] In the present invention, 42% by weight of dilute hydrochloric acid (20% acid content) is added to the reaction tank, and 40% by weight of aluminum hydroxide sludge is gradually added, and the reaction is stirred to completely react and dissolve the aluminum hydroxide sludge to gradually generate liquid aluminum trichloride. , Stop heating when the heating temperature reaches 80°C; gradually add 17% by weight of calcium aluminate powder and 1% by weight of defoamer, continue the reaction and dissolve, and gradually increase the temperature to 110°C (boiling); add calcium aluminate powder Then use a precision pH test paper of 0 to 5 to detect the pH value, so that the pH value is controlled at 4.2; then the material is discharged after the heat preservation reaction for 2 hours. After natural pr...

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Abstract

The present invention relates to a method for producing aluminium polychloride by utilizing aluminium hydroxide sludge. Said method includes the following steps: firstly, adding dilute hydrochloric acid or waste hydrochloric acid into reaction tank, then adding aluminium hydroxide sludge, stirring to make reaction and dissolvation, adding calcium aluminate powder and adding additive, make continuous reaction and dissolvation, heat-insulating, making natural precipitation to obtain supernatant fluid, said supernatant fluid is liquid aluminium polychloride; making the liquid aluminium polychloride be fed into a high-level tank and added into a pool under the drying drum, making the drying drum be contacted with said liquid aluminium polychloride, and making the liquid aluminium polychloride be adsorbed on the surface of said drum, utilizing scraper blade in the front of said drum to scrape off said absorbed liquid aluminium polychloride from the drum so as to obtain the solid aluminium polychloride.

Description

Technical field [0001] The invention relates to a method for producing polyaluminum chloride using aluminum hydroxide sludge, and is specifically used for wastewater treatment to achieve the purpose of comprehensive utilization of waste, and belongs to the technical field of sewage treatment. Background technique [0002] In the aluminum production process, acid washing wastewater and alkaline washing wastewater are generally produced, which are rich in free aluminum ions, and are processed to produce aluminum hydroxide sludge (hereinafter referred to as aluminum-containing sludge). It has not been reused at present, and is usually used for landfill treatment, which is likely to cause secondary pollution and waste land resources. [0003] In the prior art, polyaluminum chloride mainly adopts dilute hydrochloric acid or waste hydrochloric acid to react and polymerize with calcium aluminate, and is separated by precipitation, the supernatant liquid is dried, and then the finished p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/56C02F1/52
Inventor 童益
Owner 童益
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