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Preparation method of modified poly(iron chloride)

A polyferric chloride, modified technology, applied in chemical instruments and methods, water/sewage treatment, flocculation/sedimentation water/sewage treatment, etc., can solve the problem of large-scale industrial production, limited application, polychlorination Poor iron stability and other problems, to achieve excellent coagulation performance, reduce chemical oxygen demand, and easy to obtain raw materials

Inactive Publication Date: 2016-01-13
CHANGZHOU WUJIN YOUBANG WATER PURIFICATION MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor stability of polyferric chloride, large-scale industrial production has not yet been formed, which limits its application.

Method used

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  • Preparation method of modified poly(iron chloride)

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] In the reactor, add 200kg of iron-containing waste hydrochloric acid (iron content 15%, acidity 3%), disodium hydrogen phosphate 5.56kg, add 77kg of water and 25kg of industrial solid ferrous chloride according to the iron-containing waste hydrochloric acid index, and start stirring , slowly add 8.45kg of sodium chlorate, control the reaction temperature at 50°C, and add 0.60kg of stable retarder sodium acetate after half an hour; after continuing to keep warm for half an hour, the iron content in the final modified polyferric chloride product is 12.65%. is 22.22.

Embodiment 2

[0018] In the reactor, add 300kg of iron-containing waste hydrochloric acid (iron content 18%, acidity 1%), dipotassium hydrogen phosphate 19.34kg, add 115.38kg of water, 1.15kg of industrial hydrochloric acid and 25kg of industrial solid chlorine according to the iron-containing waste hydrochloric acid index Ferrous chloride, start stirring, slowly add 13.60kg of sodium chlorate, control the reaction temperature at 90°C, add 2.85kg of stable retarder potassium acetate half an hour later; continue to keep warm for half an hour and finally modify the iron content in the polyferric chloride product 13.48%, the degree of alkalinity is 14.88.

Embodiment 3

[0020] In the reactor, add 400kg of iron-containing waste hydrochloric acid (10% iron content, 2% acidity), 24.0kg of disodium hydrogen phosphate, add 153.85kg of water, 1.15kg of industrial hydrochloric acid and 72.82kg of industrial solids according to the iron-containing waste hydrochloric acid index Ferrous chloride, start stirring, slowly add 14.30kg of sodium chlorate, control the reaction temperature at 70°C, add 3.90kg of stable retarder citric acid after half an hour; continue to keep warm for half an hour and finally modify the iron in the polyferric chloride product The content is 10.37%, and the degree of alkalization is 10.99.

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Abstract

The invention relates to a preparation method of modified poly(iron chloride). The preparation method is characterized by comprising the following steps: adding iron-containing waste hydrochloric acid and phosphate into a reactor, stirring, adding an oxidizing agent to carry out oxidation polymerization reactions for half hour, then adding a stabilizing retarder, and carrying on reactions for another half hour to obtain the modified poly(iron chloride) coagulant. The preparation method has the advantages that the resources are recycled, the raw materials are easily-available, the operation is simple, the production is safe and environment-friendly, the coagulation performance is excellent, and the modified poly(iron chloride) coagulant can be widely applied to sewage treatment, effectively remove soluble phosphor and phosphor in other forms in water, and reduce the chemical oxygen demand (COD) and chroma.

Description

technical field [0001] The invention relates to a preparation method of modified polyferric chloride, which belongs to the technical fields of solid waste disposal, resource recycling and development of circular economy. Background technique [0002] Many iron and steel processing enterprises in my country use hydrochloric acid pickling process. This part of waste acid has not been fully and effectively utilized at present. Usually, ferric chloride solution is prepared by oxidizing waste acid with iron filings or industrial ferrous chloride. Although ferric chloride solution is a relatively good inorganic coagulant, because the solution system contains a large amount of free acid, the corrosion of equipment is serious during use, so that the application range of ferric chloride solution is limited. Extremely restrictive. The polyferric chloride solution contains a large amount of polymerized cations, which can effectively exert the coagulation effect. At the same time, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56C02F1/58
Inventor 蒋银峰周斌王桂玉
Owner CHANGZHOU WUJIN YOUBANG WATER PURIFICATION MATERIALS
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