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Method for preparing composite coagulant by comprehensively using pickling waste acid and waste residues on surfaces of aluminum and iron

A technology of coagulant and surface acid, which is applied in the field of preparing composite coagulants, can solve the problems of small residual chromaticity, large flocs, large residual chromaticity, etc., and achieves excellent product quality, low production cost and stable product quality. Effect

Inactive Publication Date: 2016-01-06
CHANGZHOU WUJIN YOUBANG WATER PURIFICATION MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polyaluminum chloride has weak hydrolysis, small alum flowers, loose, slow sedimentation and residual aluminum has adverse effects on human health, but the residual color is small; polyferric chloride has strong hydrolysis, large flocs, dense, fast sedimentation, but residual color big

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add 70kg of industrial hydrochloric acid and 50kg of industrial water into the pre-dissolving kettle, start stirring at normal temperature, and add aluminum-containing waste slag (the aluminum content is expressed as Al 2 o 3 Calculated as 15%) 80kg, add 0.2kg of heavy metal scavenger, plate and frame filter press to obtain pale yellow clarification aluminum-containing liquid. The aluminum-containing liquid is 200kg, and the aluminum content is expressed as Al 2 o 3 Calculated as 6.0%, pH 2.5.

[0025] Add 200kg of aluminum-containing liquid, 40kg of industrial water and 30kg of steel surface pickling waste liquid into the reactor. The index of iron-containing waste hydrochloric acid is: Fe 3+ content in Fe 2 o 3 Calculated as 1.5%, Fe 2+ content in Fe 2 o 3 Calculated as 6%, HCl content is 10%, add oxidant 0.4kg, oxidize reaction at room temperature for 30 minutes, add calcium aluminate powder 38kg (aluminum content is represented by Al 2 o 3 Calculated as 50...

Embodiment 2

[0029] Add 115kg of industrial hydrochloric acid and 77kg of industrial water into the pre-dissolving kettle, start stirring at normal temperature, and add aluminum-containing waste slag (the aluminum content is expressed as Al 2 o 3 Calculated as 18.05%) 108kg, add 0.3kg of heavy metal scavenger, plate and frame press filter to obtain light yellow clarification aluminum-containing liquid. The aluminum-containing liquid is 300kg, and the aluminum content is expressed as Al 2 o 3 Calculated as 6.5%, pH 2.3.

[0030] Add 300kg of aluminum-containing liquid, 30kg of industrial water and 60kg of steel surface pickling waste liquid into the reactor. The index of iron-containing waste hydrochloric acid is: Fe 3+ content in Fe 2 o 3 Calculated as 1.2%, Fe 2+ content in Fe 2 o 3 Calculated as 8%, HCl content is 8%, add oxidant 1kg, oxidize reaction at room temperature for 30 minutes, add calcium aluminate powder 50kg (aluminum content is represented by Al 2 o 3 Calculated as...

Embodiment 3

[0034] Add 82kg of industrial hydrochloric acid and 133.5kg of industrial water into the pre-dissolving kettle, start stirring at normal temperature, and add aluminum-containing waste slag (the aluminum content is expressed as Al 2 o 3 Calculated as 39.89%) 34.5kg, add 0.25kg of heavy metal scavenger, plate and frame press filter to obtain light yellow clarification aluminum-containing liquid. The aluminum-containing liquid is 250kg, and the aluminum content is expressed as Al 2 o 3 Calculated as 5.5%, the pH is 2.2.

[0035] Add 250kg of aluminum-containing liquid, 30kg of industrial water and 60kg of steel surface pickling waste liquid into the reaction kettle. The index of iron-containing waste hydrochloric acid is: Fe 3+ content in Fe 2 o 3 Calculated as 1.2%, Fe 2+ content in Fe 2 o 3 Calculated as 11%, HCl content is 6%, add oxidant 1.45kg, oxidize reaction at room temperature for 30 minutes, add calcium aluminate powder 52kg (aluminum content is represented by A...

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Abstract

The invention relates to a method for preparing a composite coagulant by comprehensively using pickling waste acid and waste residues on surfaces of aluminum and iron. The method includes the steps that waste residues containing aluminum are dissolved in acid; heavy metal is removed; aluminum-containing liquid is prepared; an inorganic composite coagulant is prepared; the inorganic and organic composite coagulant is prepared. The method has the advantages that raw material resources are wide, production cost is low, product quality is excellent, and the production process is environmentally friendly.

Description

technical field [0001] The invention relates to a method for preparing a composite coagulant by comprehensively utilizing waste acid residues from pickling on the surface of aluminum and iron, and belongs to the technical fields of solid waste disposal, resource regeneration and utilization, and development of circular economy. Background technique [0002] Hydrochloric acid is used for pickling during the surface processing of aluminum and iron metals, and a large amount of pickling waste liquid is generated. Since there is no suitable way to use these waste liquids, these waste pickling liquids are often treated as wastewater, and the resulting The sludge is also directly landfilled, which not only consumes a lot of manpower and financial resources, but also occupies limited land resources. [0003] The aluminum content and acidity in the pickling waste liquid on the surface of aluminum profiles are relatively low, and have no direct utilization value. Generally, enterpris...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52
Inventor 蒋银峰王桂玉
Owner CHANGZHOU WUJIN YOUBANG WATER PURIFICATION MATERIALS
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