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Method for producing polyaluminum sulfate by using aluminum ash

A technology for polymerizing aluminum sulfate and aluminum ash, which is applied in the direction of aluminum sulfate, aluminum sulfur compounds, chemical instruments and methods, etc., can solve problems such as unsatisfactory flocculation effect, poor product stability, complicated preparation process, etc., and achieve improved flocculation effect, adsorption Improved performance and simple preparation process

Pending Publication Date: 2020-12-29
广西锋华环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polyaluminum sulfate currently provided still has the disadvantages of high production cost, unsatisfactory flocculation effect, poor product stability, weak adsorption performance, and complicated preparation process.

Method used

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  • Method for producing polyaluminum sulfate by using aluminum ash

Examples

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Comparison scheme
Effect test

Embodiment 1

[0026] A kind of method utilizing aluminum ash to produce polyaluminum sulfate, comprises the steps:

[0027] S1: After the aluminum ash is ground, add water that is 4 times the weight of the aluminum ash and stir and mix to obtain an aluminum ash suspension, add calcium chloride and 1.8% calcium acetate that are 3.5% of the quality of the aluminum ash to the suspension, and After denitrification and fluorine removal at 50°C for 45 minutes, solid-liquid separation is carried out, and the separated solid is harmless aluminum ash;

[0028] S2: Add 1.3 tons of harmless aluminum ash, 1.8 tons of concentrated sulfuric acid and 8 tons of water into the reactor, react at a temperature of 100°C for 3 hours, cool down to 60°C, and then add 8kg of stabilizer, 12kg of polyethylene glycol and sixteen Alkyltrimethylammonium bromide 4.5kg, described stabilizing agent is made up of sodium metaaluminate, phytic acid and ammonium dihydrogen phosphate that mass ratio is 5:2:3, stirs 1h, gets al...

Embodiment 2

[0032] A kind of method utilizing aluminum ash to produce polyaluminum sulfate, comprises the steps:

[0033] S1: After the aluminum ash is ground, add water that is 5 times the weight of the aluminum ash and stir and mix to obtain an aluminum ash suspension, add calcium chloride and 1.3% calcium acetate that are 4.2% of the quality of the aluminum ash in the suspension, and Reaction at 60°C for 40 minutes to remove nitrogen and fluorine, and then conduct solid-liquid separation, the separated solid is harmless aluminum ash;

[0034] S2: Add 1.15 tons of harmless aluminum ash, 1.6 tons of concentrated sulfuric acid and 6 tons of water into the reactor, react at a temperature of 100°C for 2.5 hours, cool down to 70°C, and then add 7kg of stabilizer, 10kg of polyethylene glycol and ten Hexaalkyltrimethylammonium bromide 3kg, described stabilizing agent is made up of sodium metaaluminate, phytic acid and ammonium dihydrogen phosphate that mass ratio is 7:2:5, stirs 1.5h, gets alu...

Embodiment 3

[0038] A kind of method utilizing aluminum ash to produce polyaluminum sulfate, comprises the steps:

[0039] S1: After the aluminum ash is ground, add water that is 4.5 times the weight of the aluminum ash and stir and mix to obtain an aluminum ash suspension, add calcium chloride and 1.8% calcium acetate that are 3.8% of the aluminum ash quality in the suspension, and After denitrification and fluorine removal at 50°C for 60 minutes, solid-liquid separation is carried out, and the separated solid is harmless aluminum ash;

[0040] S2: Add 1.5 tons of harmless aluminum ash, 2.0 tons of concentrated sulfuric acid and 8 tons of water into the reactor, react at a temperature of 120°C for 3 hours, cool down to 80°C, and then add 5kg of stabilizer, 12kg of polyethylene glycol and sixteen Alkyltrimethylammonium bromide 4kg, described stabilizing agent is made up of sodium metaaluminate, phytic acid and ammonium dihydrogen phosphate that mass ratio is 5:2:5, stirs 1h, gets aluminum ...

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Abstract

The invention discloses a method for producing polyaluminum sulfate by using aluminum ash, which comprises the following steps: grinding the aluminum ash, adding water which is 3-5 times of the weightof the aluminum ash, conducting stirring and mixing to obtain an aluminum ash suspension, adding calcium chloride and calcium acetate into the suspension to remove nitrogen and fluorine, and carryingout solid-liquid separation to obtain a separated solid which is harmless aluminum ash; adding 1.0-1.5 tons of harmless aluminum ash, 1.5-2.0 tons of concentrated sulfuric acid and 5-10 tons of waterinto a reaction kettle, conducting reacting for 2-4 hours, adding 5-10 kg of a stabilizer, 10-15 kg of polyethylene glycol and 3-5 kg of hexadecyltrimethylammonium bromide, and conducting stirring for 0.5-1.5 hours to obtain aluminum sulfate liquid; and carrying out filter pressing, drying and packaging to obtain the polyaluminum sulfate. The aluminum ash is used as a raw material for preparing the polyaluminum sulfate, harmless treatment of the aluminum ash and recycling of resources are achieved, and the production cost is reduced. The prepared polyaluminum sulfate has the advantages of large specific surface area, favorable adsorptive property, favorable stability and large formed alumen ustum, enhances the flocculation property and flocculation effect, and can quickly remove turbidity, chroma, heavy metal ions, COD and other pollutants.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a method for producing polyaluminum sulfate by using aluminum ash. Background technique [0002] The flocculation process is one of the key links in the treatment process of modern urban water supply and industrial wastewater. It can not only remove sensory indicators such as turbidity and color of raw water, but also remove various toxic and harmful pollutants. As the most widely used flocculant in water treatment, polyaluminum is widely used in the fields of drinking water, industrial wastewater and domestic sewage treatment. The current products of polyaluminum flocculant mainly include polyaluminum chloride (PAC), polyaluminum sulfate (PAS), polyaluminum sulfate chloride (PACS), polyaluminum phosphate chloride (PPAC), polyaluminum ferric sulfate (PAFS), Polyaluminum iron sulfate (PAFCS), polyaluminum silicate (PASI). At present, polyaluminum chloride (PAC) is the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/74C02F1/52
CPCC01F7/74C02F1/5236C01P2006/12C01P2006/80
Inventor 韦晨熙农成龙黄海林陆锋
Owner 广西锋华环保科技有限公司
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