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A kind of method for preparing solid polyferric sulfate

A technology of solid polymerization and ferric sulfate, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water/sludge/sewage treatment, etc., can solve high product transportation costs, strong corrosion of equipment, and inconvenient storage and other problems, to achieve the effect of small impact, fast sedimentation and good decolorization effect

Active Publication Date: 2021-08-13
SHENZHEN CHANGLONG TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the commonly used polyferric sulfate in the market is liquid, which has problems such as high product transportation costs, inconvenient storage, and strong corrosion to equipment.
If liquid polyferric sulfate is used to prepare solids by drying, the equipment requirements are high and energy consumption is large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] ①Preparation of polymerized ferric sulfate liquid, accurately weigh the by-product of titanium dioxide production, ferrous sulfate heptahydrate (FeSO 4 •7H 2 O) 100g in a 500ml three-necked bottle, start the magnetic stirrer, then add 52g of tap water, 9.34g of 98% concentrated sulfuric acid successively; add 5.43g of sodium chlorate under the condition of stirring, keep the condition of reaction, and react for 30 minutes; Cool to room temperature then, filter to obtain dark brown polyferric sulfate liquid;

[0012] ②Preparation of solid polymeric ferric sulfate, weigh the reaction ①Put 100g of the liquid into a 200ml beaker, and add 2.1g of polyepichlorohydrin dimethylamine with a viscosity of 200-10000Pa·s and 0.15g of white cement respectively under stirring conditions , stirred and reacted at room temperature for 10 minutes, then stood for a period of time to naturally solidify, and the solid was crushed to obtain a yellow polyferric sulfate solid.

Embodiment 2

[0014] A method for preparing solid polyferric sulfate, comprising the steps of:

[0015] (1) Weigh 200 parts by weight of ferrous sulfate heptahydrate in the container, and then add 120 parts by weight of tap water and 20 parts by weight of concentrated sulfuric acid with a mass concentration of 98% under stirring with a magnetic stirrer;

[0016] (2) Continue to stir, then add 10 parts by weight of sodium chlorate, stir and react for 50 minutes, then cool to room temperature;

[0017] (3) Add 2.3 parts by weight of polyepichlorohydrin dimethylamine with a viscosity of 200 to 10000 Pa·s and 1 part by weight of white cement, stir and react at room temperature for 25 minutes, then let it stand for natural curing for 18 days, and crush the obtained solid A yellow polyferric sulfate solid was obtained.

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Abstract

A method for preparing solid polyferric sulfate, the invention belongs to the field of water treatment, the present invention adopts the following technical scheme, adopts ferrous sulfate heptahydrate, sodium chlorate and concentrated sulfuric acid to react to prepare polyferric sulfate liquid, and then by adding The viscosity is 200-10000Pa·s polyepichlorohydrin dimethylamine and white cement, and then placed and solidified to obtain polyferric sulfate solid. Due to the adoption of the above technical scheme, the present invention has the following advantages: (1) Compared with the existing production process of solid polyferric sulfate, the present invention does not need drying and heating equipment, saving 1 / 3 of the production cost; (2) Compared with polyferric sulfate and polyaluminum chloride produced by other methods, the product obtained by the invention has larger alum flowers and faster sedimentation; (3) the product obtained by the invention has good decolorization effect, total phosphorus and COD removal rate High, little impact on water pH and so on.

Description

technical field [0001] The invention belongs to the field of water treatment, in particular to a method for preparing solid polyferric sulfate. Background technique [0002] At present, the inorganic polymer coagulants polyferric sulfate and polyaluminum chloride are widely used in the treatment of various industrial sewage, domestic sewage and drinking water, especially polyferric sulfate because of its wide applicable pH range, large alum, floc It has the advantages of dense body, fast settlement and cheap price, and is the most widely used in the domestic sewage treatment field. However, the commonly used polyferric sulfate in the market is liquid, which has problems such as high product transportation cost, inconvenient storage, and strong corrosion of the product to equipment. If liquid polyferric sulfate is used to prepare solid by drying, it requires high equipment and consumes a lot of energy. [0003] In addition, the current process for producing solid polyferric...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52
CPCC02F1/5236
Inventor 李杨董林辉苑国栋吴修平黄剑彬
Owner SHENZHEN CHANGLONG TECH CO LTD
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