Polyferric sulfate and preparation method thereof

A technology for polymerizing ferric sulfate and ferric sulfate, applied in the direction of ferric sulfate, etc., can solve the problems of increasing the complexity of operation, long process flow, etc.

Active Publication Date: 2021-08-13
JILIN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The process is longer and increases the complexity of the operation

Method used

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  • Polyferric sulfate and preparation method thereof
  • Polyferric sulfate and preparation method thereof
  • Polyferric sulfate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Add sulfuric acid with a mass concentration of 80% to pyrite slag, the liquid-solid ratio of sulfuric acid to pyrite slag is 3:2 (L / kg), calcined at 400°C for 30min, matured and solidified to obtain ferric sulfate solidified material ;

[0038] Mix ferric sulfate solidified material and water according to the ratio of solid-to-liquid ratio of 1:4 (kg / L), and magnetically stir at 30°C and 300r / min until it is in a solid state to obtain a polymerized ferric sulfate product.

Embodiment 2

[0040] Add sulfuric acid with a mass concentration of 80% to pyrite slag, the liquid-solid ratio of sulfuric acid to pyrite slag is 3:2 (L / kg), calcined at 400°C for 30min, matured and solidified to obtain ferric sulfate solidified material ;

[0041] Mix ferric sulfate solidified material and water according to the ratio of solid to liquid ratio of 1:4 (kg / L), and magnetically stir at 40°C and 300r / min until it is in a solid state to obtain a polymerized ferric sulfate product.

Embodiment 3

[0043] Add sulfuric acid with a mass concentration of 80% to pyrite slag, the liquid-solid ratio of sulfuric acid to pyrite slag is 3:2 (L / kg), calcined at 400°C for 30min, matured and solidified to obtain ferric sulfate solidified material ;

[0044] Mix ferric sulfate solidified material and water according to the ratio of solid to liquid ratio of 1:4 (kg / L), and magnetically stir at 50°C and 300r / min until it is in a solid state to obtain a polymerized ferric sulfate product.

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Abstract

The invention provides polyferric sulfate and a preparation method thereof, and relates to the technical field of flocculant materials. The preparation method provided by the invention comprises the following steps: (1) mixing pyrite cinder with sulfuric acid, and carrying out high-temperature calcination to obtain a ferric sulfate curing material; wherein the mass concentration of the sulfuric acid is 60-90%, and the dosage ratio of the sulfuric acid to the pyrite cinder is (2-4L): (2-4kg); the temperature of the high-temperature calcination is 350-450 DEG C, and the time of the high-temperature calcination is 25-40 minutes; and (2) mixing the ferric sulfate curing material with water, and carrying out hydrolytic polymerization under a stirring condition to obtain solid polymeric ferric sulfate. According to the method disclosed by the invention, the steps of leaching iron in the pyrite cinder, reducing a ferric iron compound into a ferrous iron compound at a high temperature and then oxidizing the ferrous iron compound in the traditional method are abandoned, so that the process flow for preparing the polyferric sulfate is greatly simplified; and the obtained polymeric ferric sulfate product is excellent in flocculation effect and remarkable in water purification effect.

Description

technical field [0001] The invention relates to the technical field of flocculant materials, in particular to a polymeric ferric sulfate and a preparation method thereof. Background technique [0002] Pyrite slag is the waste in the process of industrial production of sulfuric acid (the product obtained under high temperature calcination at 800-900 ℃), which contains a large amount of iron compounds and acidic substances, and is an important raw material for the production of polyferric sulfate. Polyferric sulfate is an inorganic polymer flocculant with excellent flocculation performance. Compared with traditional low-molecular iron salt and aluminum salt flocculants, it has the advantages of small dosage and high removal rate of COD (chemical oxygen demand) and chroma. Using pyrite slag as raw material to prepare polyferric sulfate is not only beneficial to eliminate the environmental pollution caused by slag, but also can make comprehensive utilization of slag and increase...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/14
CPCC01G49/14C01P2004/60C01P2006/40C01P2002/72C01P2004/51
Inventor 郭玉鹏李雅洁康晓婷原徐娜屈学俭魏士刚赵旭李向宏
Owner JILIN UNIV
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