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Method for producing polyaluminium sulfate from aluminum profile machining waste liquid

A technology for processing polyaluminum sulfate and aluminum profiles, which is applied in the field of clean production and resource reuse, can solve problems such as affecting the environment and clean production, and achieve the effects of overcoming the low effective concentration of products, protecting the environment and increasing economic benefits.

Inactive Publication Date: 2017-02-15
重庆中昆新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a method for producing polyaluminum sulfate by utilizing aluminum profile processing waste liquid, aiming at resource utilization of aluminum-containing alkaline waste liquid, thereby solving the problem of aluminum-containing alkali in the current technology. The impact of sexual waste liquid on the environment and the technical problems of clean production

Method used

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  • Method for producing polyaluminium sulfate from aluminum profile machining waste liquid

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Effect test

Embodiment 1

[0030] The aluminum-containing alkaline waste liquid produced during the processing of aluminum profiles is used as the raw material, and the main component of the raw material is NaAlO 2 and NaOH, with a small amount of metal hydroxides in the form of precipitates. Polyaluminum sulfate was synthesized by the following method:

[0031] 1) Pass the aluminum-containing alkaline waste liquid through a 200-mesh sieve to remove solid impurities contained therein, and obtain the deslagging aluminum-containing alkaline waste liquid for future use.

[0032] 2) Take part of the deslagging aluminum-containing alkaline waste liquid obtained in step 1) and pass carbon dioxide into it, so that sodium metaaluminate is hydrolyzed and aluminum hydroxide precipitates, until no more precipitation occurs, press filter to separate, and obtain Solid Al(OH) 3 and Na 2 CO 3 solution, set aside.

[0033] 3) The solid Al(OH) obtained in step 2) 3 Dissolved in 40% H 2 SO 4 solution until solid ...

Embodiment 2

[0039] The aluminum-containing alkaline waste liquid produced during the processing of aluminum profiles is used as the raw material, and the main component of the raw material is NaAlO 2 and NaOH, with a small amount of metal hydroxides in the form of precipitates. Polyaluminum sulfate was synthesized by the following method:

[0040] 1) Pass the aluminum-containing alkaline waste liquid through a 800-mesh sieve to remove the solid impurities contained therein, and obtain the deslagging aluminum-containing alkaline waste liquid, which is set aside;

[0041] 2) Take part of the deslagging aluminum-containing alkaline waste liquid obtained in step 1) and pass carbon dioxide into it, so that sodium metaaluminate is hydrolyzed and aluminum hydroxide precipitates, until no more precipitation occurs, press filter to separate, and obtain Solid Al(OH) 3 and Na 2 CO 3 solution, spare;

[0042] 3) The solid Al(OH) obtained in step 2) 3 Dissolved in 20% H 2 SO 4 solution until s...

Embodiment 3

[0048] The aluminum-containing alkaline waste liquid produced during the processing of aluminum profiles is used as the raw material, and the main component of the raw material is NaAlO 2 and NaOH, with a small amount of metal hydroxides in the form of precipitates. Polyaluminum sulfate was synthesized by the following method:

[0049] 1) Pass the aluminum-containing alkaline waste liquid through a 600-mesh sieve to remove the solid impurities contained therein, and obtain the deslagging aluminum-containing alkaline waste liquid for later use;

[0050] 2) Take part of the deslagging aluminum-containing alkaline waste liquid obtained in step 1) and pass carbon dioxide into it, so that sodium metaaluminate is hydrolyzed and aluminum hydroxide precipitates, until no more precipitation occurs, press filter to separate, and obtain Solid Al(OH) 3 and Na 2 CO 3 solution, spare;

[0051] 3) The solid Al(OH) obtained in step 2) 3 Dissolved in 30% H 2 SO 4 solution until solid A...

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Abstract

The invention discloses a method for producing polyaluminium sulfate from aluminum profile machining waste liquid. The method comprises the following steps: with aluminum-containing alkaline waste liquid produced in the aluminum profile machining process as a raw material, preparing solid Al(OH)3 and a NaAlO2 solution respectively, then preparing the solid Al(OH)3 into an Al2(SO4)3 solution, finally blending the NaAlO2 solution, the Al2(SO4)3 solution and a phosphoric acid solution, and digesting to obtain polyaluminium sulfate. By the method, resource utilization of the aluminum-containing alkaline waste liquid is achieved, and in the whole process, new waste liquid is not produced, so that zero pollutant emission is achieved and cleanness and safety of the production process are ensured; meanwhile, a conventional model that harmless pollutant disposal is a pure investment project is changed, the environment is protected and economic benefits are increased, so that two advantages are achieved at one stroke.

Description

technical field [0001] The invention belongs to the technical field of clean production and resource reuse, and in particular relates to a method for producing polyaluminum sulfate by utilizing aluminum profile processing waste liquid. Background technique [0002] With the rapid development of my country's infrastructure construction, the use of aluminum profiles in rail transit, construction and other industrial fields has increased significantly, and its output has also shown an increasing trend year by year. [0003] The main process for producing aluminum profiles is mold extrusion molding. After the profiles are extruded, the remaining aluminum alloy in the mold cavity is usually dissolved under heating conditions with a sodium hydroxide solution with a mass fraction of 20-30%, resulting in a large amount of Alkaline waste liquid containing aluminum. [0004] The main component of this aluminum-containing alkaline waste liquid is a mixture of sodium metaaluminate and ...

Claims

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Application Information

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IPC IPC(8): C01F7/74C01F11/18
CPCC01F7/741C01F11/181C01P2006/10
Inventor 龚德平
Owner 重庆中昆新材料科技有限公司
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