Method for preparing flocculant liquid polyaluminum chloride from aluminum ash

A technology of polyaluminum chloride and flocculant, applied in aluminum chloride, aluminum halide, flocculation/sedimentation water/sewage treatment, etc., can solve the problems of environmental pollution, direct or indirect harm to the environment, and avoid secondary pollution , The effect of making full use of renewable resources and simple process

Inactive Publication Date: 2012-09-19
李松 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In short, aluminum ash contains many substances that will directly or indirectly cause harm to the environment, and direct disposal will cause environmental pollution

Method used

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  • Method for preparing flocculant liquid polyaluminum chloride from aluminum ash
  • Method for preparing flocculant liquid polyaluminum chloride from aluminum ash

Examples

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Embodiment 1

[0022] Embodiment 1: A method for preparing a flocculant liquid polyaluminum chloride by using aluminum ash, which includes the following steps: 1. mix and stir aluminum ash and water at a volume ratio of 1:3, and soak for 8 hours; 2. extract the upper liquid To the sedimentation tank, reuse after treatment, pump the remaining aluminum ash after washing into the reaction kettle; ③According to the volume ratio aluminum ash: hydrochloric acid: water is 1: 2.5: 3.0 to the aluminum ash after washing Add hydrochloric acid and water, stir evenly to form a mixed solution; ④Set the temperature of the reactor to 85°C, and react for 2.5 hours; Continue the reaction in the reaction kettle; ⑥Use the plate and frame filter press to separate the solid and liquid from the reacted mixed solution, and the waste residue can be used as cement production additive or brick-making raw material after air-drying; Add a regulator to adjust the alumina content and basicity of the liquid. Quicklime is u...

Embodiment 2

[0023]Embodiment 2: A kind of method that utilizes aluminum ash to prepare flocculant liquid polyaluminum chloride, it comprises the following steps: ① mix and stir aluminum ash and water according to the volume ratio 1: 4, soak for 7 hours; ② extract the upper layer liquid To the sedimentation tank, reuse after treatment, pump the remaining aluminum ash after washing into the reaction kettle; ③According to the volume ratio of aluminum ash: hydrochloric acid: water is 1: 3.0: 4.0 into the washed aluminum ash Add hydrochloric acid and water, stir evenly to form a mixed solution; ④Set the temperature of the reactor to 90°C, and react for 3 hours; ⑤The gas generated during the reaction process is sprayed and absorbed by the absorption tower. Continue the reaction in the reaction kettle; ⑥Use the plate and frame filter press to separate the solid and liquid from the reacted mixed solution, and the waste residue can be used as cement production additive or brick-making raw material ...

Embodiment 3

[0024] Embodiment 3: A kind of method that utilizes aluminum ash to prepare flocculant liquid polyaluminum chloride, it comprises the following steps: ① mix and stir aluminum ash and water according to the volume ratio 1:5, soak for 5 hours; ② extract the upper layer liquid To the sedimentation tank, reuse after treatment, pump the remaining aluminum ash after washing into the reaction kettle; ③According to the volume ratio of aluminum ash: hydrochloric acid: water is 1: 2.5: 3.5 to the aluminum ash after washing Add hydrochloric acid and water, stir evenly to form a mixed solution; ④Set the temperature of the reactor to 100°C, and react for 2 hours; Continue the reaction in the reaction kettle; ⑥Use the plate and frame filter press to separate the solid and liquid from the reacted mixed solution, and the waste residue can be used as cement production additive or brick-making raw material after air-drying; Add a conditioner to adjust the content and basicity of liquid alumina,...

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Abstract

The invention discloses a method for preparing flocculant liquid polyaluminum chloride from aluminum ash, belonging to the technical field of solid waste treatment environment protection. The method comprises the following steps: uniformly mixing and stirring aluminum ash and water in a volume ratio of 1:(3-5), and soaking for 5-8 hours; pumping the solution into a reaction kettle, adding hydrochloric acid and water in an aluminum ash/hydrochloric acid/water volume ratio of 1:(2.5-3.0):(3.0-4.0), and reacting at 85-100 DEG C for 2-3 hours; carrying out solid-liquid separation with a plate and frame type filter-press, and adding a regulator to regulate the aluminum oxide content and basicity of the liquid, wherein if quicklime is used as the regulator, the volume ratio of the liquid to the quicklime is 1:(0.054-0.086), if aluminum dust is used as the regulator, the volume ratio of the liquid to the aluminum dust is 1:(0.023-0.04), and if solid calcium aluminate is used as the regulator, the volume ratio of the liquid to the solid calcium aluminate is 1:(0.042-0.063); and standing and aging for 48-72 while controlling the temperature at 50-60 DEG C, thereby obtaining the liquid polyaluminum chloride finished product. The invention has the advantages of simple technique, low cost and no secondary pollution, and is a good method for recycling aluminum ash.

Description

technical field [0001] The invention relates to a preparation method of flocculant liquid polyaluminum chloride, in particular to a method for preparing flocculant liquid polyaluminum chloride by using aluminum ash. Background technique [0002] Various by-products are produced during the aluminum smelting and forming process. As the main by-product of the aluminum processing industry, aluminum ash is produced in all aluminum melting processes, and the aluminum content in it accounts for about 1% to 12% of the total loss in the process of aluminum production and use. With the increasing application range of metal aluminum, the production of aluminum ash will also increase proportionally. In the past, people regarded aluminum ash as waste residue and piled up like mountains everywhere, which caused great pressure on the land and the ecological environment. In addition, aluminum nitride in aluminum ash will decompose and produce ammonia after being damp in the air, and the sm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/56C02F1/52
Inventor 李松胡保国蒋晨
Owner 李松
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