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Method for preparing polymerized iron chloride by using cinder of sulfur iron ore

A technology of pyrite slag and polyferric chloride, which is applied in the preparation of ferric halide and chloride, can solve the problems of pollution and low investment, and achieve the effects of good flocculation efficiency, high ecological safety and low production cost

Inactive Publication Date: 2007-10-10
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing polyferric chloride with pyrite slag. The method not only has low investment, quick results, no secondary pollution, and solves the problem of pyrite slag being piled up in the environment. Pollution problems, while producing water treatment agent products with high added value

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Using pyrite slag, hydrochloric acid and sodium hydroxide as raw materials, it is prepared as follows:

[0022] 1) Mix 100g pyrite slag and 218ml 28% hydrochloric acid at a mass ratio of 0.4:1, react at 80°C for 2h, filter to obtain 160ml leachate, divide the leachate into two parts A and B, A and B The volume ratio is 1:6.

[0023] 2) Add 25% sodium hydroxide to A at a volume ratio of 1:1 to generate ferrous hydroxide and ferric hydroxide, and aerate for 15 hours to convert ferrous hydroxide into ferric hydroxide colloid.

[0024] 3) According to the volume ratio of 0.07: 1, add hydrogen peroxide with 30% concentration of oxidizing agent in B to oxidize ferrous ions to ferric ions, add a composite phosphate stabilizer, the quality is 3% of the total mass of the leachate, in the violent Under stirring, add the ferric hydroxide colloid prepared in 2) into it, and ripen for 1 hour to obtain the polymerized ferric chloride product.

Embodiment 2

[0026] Using pyrite slag, hydrochloric acid and sodium hydroxide as raw materials, it is prepared as follows:

[0027] 1) According to the mass ratio of 0.45:1, mix 100g of pyrite slag and 193ml of 30% hydrochloric acid, react at 95°C for 1h, filter to obtain 140ml of leaching solution, and divide the leaching solution into two parts A and B, A and B The volume ratio is 1:6.

[0028] 2) Add 20ml of 30% sodium hydroxide to A at a volume ratio of 1:1 to generate ferrous hydroxide and ferric hydroxide, and aerate for 12 hours to convert ferrous hydroxide into ferric hydroxide colloid.

[0029] 3) According to the volume ratio of 0.15: 1, add hydrogen peroxide with 15% concentration of oxidizing agent in B to oxidize ferrous ions to ferric ions, add a composite phosphate stabilizer, the quality is 2% of the total mass of the leachate, and in severe Under stirring, add the newly prepared ferric hydroxide colloid to it, and mature for 1 hour to obtain the polymerized ferric chlorid...

Embodiment 3

[0031] Using pyrite slag, hydrochloric acid and sodium hydroxide as raw materials, it is prepared as follows:

[0032] 1) According to the mass ratio of 0.35:1, mix 100g of pyrite slag and 255ml of 24% hydrochloric acid, react at 85°C for 1.5h, filter to obtain 210ml of leaching solution, and divide the leaching solution into two parts A and B, A and B The volume ratio is 1:5.

[0033] 2) Add 35ml of 28% sodium hydroxide to A at a volume ratio of 1:1 to generate ferrous hydroxide and ferric hydroxide, and aerate for 24 hours to convert ferrous hydroxide into ferric hydroxide colloid.

[0034] 3) According to the volume ratio of 0.075: 1, add hydrogen peroxide with 30% concentration of oxidizing agent in B to oxidize ferrous ions to ferric ions, add a composite phosphate stabilizer, and the quality is 2.4% of the total mass of the leachate. Under stirring, add the newly prepared ferric hydroxide colloid to it, and mature for 1 hour to obtain the polymerized ferric chloride pro...

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PUM

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Abstract

This invention discloses a method for preparing poly (ferric chloride) from burnt troilite slag. The method comprises: (1) mixing burnt troilite slag and 15-30% HCl at a certain ratio, reacting at 60-95 deg.C for 1-4 h, and filtering; (2) dividing the leached solution into two parts; (3) adding NaOH to one part, and aerating to obtain Fe(OH)3 colloid; (4) adding an appropriate amount of oxidant to the other part, adding composite phosphate as the stabilizer, stirring vigorously, adding the Fe(OH)3 colloid, and aging for 1 h to obtain poly(ferric chloride) product. The method has such advantages as high ecological safety, high product stability and good flocculation effect.

Description

technical field [0001] The invention relates to the fields of resource utilization and environmental protection, in particular to a method for preparing polyferric chloride by using pyrite slag. Background technique [0002] With the increasing tension of global water resources, people have put forward higher requirements for the reuse of water cycle. In the process of water supply and wastewater treatment, the superiority of flocculation technology is particularly prominent. Flocculants are one of the key links in flocculation technology, and can be divided into two categories: inorganic and organic flocculants according to their chemical properties. Organic flocculants such as polyacrylamide have a good treatment effect on industrial wastewater, but they are expensive and have certain residues in drinking water, which may affect the human body. Commonly used inorganic flocculants include aluminum sulfate, aluminum chloride, ferric chloride, ferrous sulfate and their vari...

Claims

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Application Information

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IPC IPC(8): C01G49/10C01B9/02
Inventor 李威华涛周启星
Owner NANKAI UNIV
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