Method for preparing compound type multi-element flocculating agent aluminum ferric sulfate chloride polysilicate by utilizing waste acid

A technology of aluminum ferric silicate chlorinated sulfate and silicate chlorinated sulfuric acid, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of unenvironmental protection, uneconomical, consumption of mineral resources and hydrochloric acid resources, etc. Fast, low cost, good effect of decolorization and separation

Active Publication Date: 2014-10-08
GUANGXI PINGGUO FENGHUA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This process needs to use bauxite, a large amount of calcium aluminate powder and commercial grade hydrochloric acid as raw materia...

Method used

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  • Method for preparing compound type multi-element flocculating agent aluminum ferric sulfate chloride polysilicate by utilizing waste acid
  • Method for preparing compound type multi-element flocculating agent aluminum ferric sulfate chloride polysilicate by utilizing waste acid
  • Method for preparing compound type multi-element flocculating agent aluminum ferric sulfate chloride polysilicate by utilizing waste acid

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Experimental program
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Embodiment 1

[0024] A method for preparing a composite multi-element flocculant polysilicate aluminum ferric sulfate chloride by using waste acid, comprising the following steps:

[0025] (l) Dissolving oxidation

[0026] will contain Al 2 o 3 It is 28% dry waste aluminum slag, containing 20% ​​H 2 SO 4 , 3% Fe waste sulfuric acid, 17% Fe ferrous sulfate heptahydrate, 28% HCl waste hydrochloric acid and NaClO 3 ≥98% industrial grade sodium chlorate as raw material, mix 200 parts of waste sulfuric acid with 100 parts of waste hydrochloric acid by weight, add 250 parts of dry waste aluminum slag, heat up to 95°C, keep warm and stir for 1 hour. Add 30 parts of ferrous sulfate heptahydrate under stirring, control the temperature at 40°C, add 5 parts of sodium chlorate, keep warm and stir for 1 hour, and Fe 2+ all converted to Fe 3+ ;

[0027] (2) precipitation polymerization filtration

[0028] Add 50 parts of waste hydrochloric acid to the slurry in step (1) under stirring, after heat...

Embodiment 2

[0034] A method for preparing a composite multi-element flocculant polysilicate aluminum ferric sulfate chloride by using waste acid, comprising the following steps:

[0035] (l) Dissolving oxidation

[0036] will contain Al 2 o 3 It is 28% dry waste aluminum slag, containing 20% ​​H 2 SO 4 , 3% Fe waste sulfuric acid, 17% Fe ferrous sulfate heptahydrate, 28% HCl waste hydrochloric acid and NaClO 3 ≥98% industrial grade sodium chlorate as raw material, mix 210 parts of waste sulfuric acid with 90 parts of waste hydrochloric acid by weight, add 260 parts of dry waste aluminum slag, heat up to 95°C, keep warm and stir for 1 hour. Add 32 parts of ferrous sulfate heptahydrate under stirring, control the temperature at 40°C, add 5 parts of sodium chlorate, keep warm and stir for 1 hour, and Fe 2+ all converted to Fe 3+ ;

[0037] (2) precipitation polymerization filtration

[0038] Add 52 parts of waste hydrochloric acid to the slurry in step (1) under stirring, add 52 part...

Embodiment 3

[0044] A method for preparing a composite multi-element flocculant polysilicate ferric aluminum sulphate chloride by using waste acid, comprising the steps of:

[0045] (l) Dissolving oxidation

[0046] will contain Al 2 o 3 It is 28% dry waste aluminum slag, containing 20% ​​H 2 SO 4 , 3% Fe waste sulfuric acid, 17% Fe ferrous sulfate heptahydrate, 28% HCl waste hydrochloric acid and NaClO 3 ≥98% industrial grade sodium chlorate as raw material, mix 180 parts of waste sulfuric acid with 120 parts of waste hydrochloric acid by weight, add 240 parts of dry waste aluminum slag, heat up to 95°C, keep warm and stir for 1 hour. Add 28 parts of ferrous sulfate heptahydrate under stirring, control the temperature at 40°C, add 5 parts of sodium chlorate, keep warm and stir for 1 hour, and Fe 2+ all converted to Fe 3+ ;

[0047] (2) precipitation polymerization filtration

[0048] Add 48 parts of waste hydrochloric acid to the slurry in step (1) under stirring, add 49 parts of ...

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Abstract

The invention relates to a method for preparing a compound type multi-element flocculating agent aluminum ferric sulfate chloride polysilicate. The method comprises the following 4 steps of: dissolving and oxidizing; precipitation polymerization and filtering; compound polymerization; synthesis of the aluminum ferric sulfate chloride polysilicate. The method disclosed by the invention can be used for producing the compound type multi-element flocculating agent aluminum ferric polysilicate by integrally utilizing the waste sulfuric acid liquor, ferrous sulfate heptahydrate, waste aluminum slag and waste hydrochloric acid liquor of a titanium dioxide plant, a chemical plant and a steel and ion plant in a recycling way. The prepared flocculating agent can be widely applied to the treatment of domestic sewage and industrial wastewater, has higher turbidity, color and COD removing capacity compared with the treatment effect of polyaluminium chloride and polyaluminum ferric chloride and has the advantages of high floc forming velocity, large and compact floc, high sedimentation velocity and small sedimentary sludge size.

Description

technical field [0001] The invention relates to a method for preparing a composite multi-element flocculant polyaluminum ferric sulphate chloride by using waste acid, and belongs to the technical field of comprehensive utilization of industrial waste liquid and residue and chemical production. Background technique [0002] The composite flocculant is based on the polymerization reaction of polyaluminum ferric sulfate and polyaluminum chloride ferric salt with active polysilicate solution, and then adding organic polymer PDM (polydimethyldiallylammonium chloride) and organic decolorization Polymer composite flocculant formed by polymerization of DDF (dicyandiamide formaldehyde condensation polymer). It has both the properties of polyaluminum and polyiron, strong decolorization and turbidity removal, large alum flowers, fast sedimentation, and easy dehydration of sludge. Exclusive pharmaceutical properties are embodied in the treatment of wastewater in the sugar chain. The r...

Claims

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Application Information

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IPC IPC(8): C02F1/52
Inventor 陆锋黄政瑛
Owner GUANGXI PINGGUO FENGHUA TECH
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