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Preparation method of polymeric ferric sulfate

A technology for polymerizing ferric sulfate and ferrous sulfate, which is applied in the direction of ferric sulfate, can solve the problems of high energy costs, etc., and achieve the effects of short production cycle, high stability and simple equipment

Inactive Publication Date: 2016-07-20
YOUDING YONGAN OPTOELECTRONICS MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Clearly, a major disadvantage of these processing methods is the large amount of energy required and the costs associated with thermal decomposition

Method used

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  • Preparation method of polymeric ferric sulfate
  • Preparation method of polymeric ferric sulfate
  • Preparation method of polymeric ferric sulfate

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preparation example Construction

[0023] Such as figure 1 As shown, the preparation method of polymeric ferric sulfate of the present invention basically includes the following steps in sequence.

[0024] Step a: Provide waste sulfuric acid, such as waste sulfuric acid produced in the semiconductor industry, photoelectric industry or other industries. The content of sulfuric acid in the waste sulfuric acid is generally 20-80%.

[0025] Step b: Perform mixing and feeding, and place at least one iron piece 1, the above-mentioned waste sulfuric acid and water in a first reaction tank 2 in sequence, please refer to figure 2 As shown, the iron flakes 1 can be multiple in a radial shape to increase the reaction area, and the volume ratio of waste sulfuric acid to water is 1:1.5 to 1:3; for example, the volume ratio of waste sulfuric acid to water is added 1:2 is better, the temperature in the first reaction tank 2 is controlled at 30-50°C; and the pH in the first reaction tank 2 is controlled at 1-3, and the reaction tim...

Embodiment 1

[0030] Take an appropriate amount of iron flakes, put it into the reaction tank, and add about 500L of waste sulfuric acid, and then slowly add about 1500L of tap water to react. The reaction time is about 15 minutes, the pH is about 1±0.5, and the reaction temperature is about 50°C. When the content of ferrous iron in the liquid in the reaction tank is ≧3%, it is semi-finished ferrous sulfate; after filtering the semi-finished ferrous sulfate, take 2000L of ferrous sulfate, 20L tap water and 60L sulfuric acid into the second reaction tank , And introduce about 60L of hydrogen peroxide from the bottom of the tank to react. The reaction time is 10 minutes, and the reaction temperature is about 30°C. When the weight percentage of liquid divalent iron converted into trivalent iron content in the reaction tank is greater than or equal to 3%, that is It is the finished polymer ferric sulfate (PFS).

Embodiment 2

[0032] Take a proper amount of iron flakes, put it into the reaction tank, add about 500L of waste sulfuric acid, and then slowly add about 750L of tap water to react. The reaction time is about 10 minutes, the pH is about 2±0.5, and the reaction temperature is about 55°C. When the content of ferrous iron in the liquid in the reaction tank is ≧3%, it is semi-finished ferrous sulfate; after filtering this semi-finished ferrous sulfate, take 2000L of ferrous sulfate, 20L tap water and 60L sulfuric acid into the second reaction tank , And introduce about 60L of hydrogen peroxide from the bottom of the tank to react. The reaction time is 10 minutes, and the reaction temperature is about 35°C. When the weight percentage of liquid divalent iron converted into trivalent iron content in the reaction tank is greater than or equal to 3%, that is It is the finished polymer ferric sulfate (PFS).

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Abstract

A preparation method of polymeric ferric sulfate comprises the following steps in sequence: step a, providing waste sulfuric acid; step b, adding and mixing: sequentially adding at least one iron sheet, waste sulfuric acid obtained in the step (a), and water into a first reaction tank, wherein the volume ratio of waste sulfuric acid to water is 1:1.5-3, and carrying out reactions to form a ferrous sulfate semi-finished product with a ferrous sulfate content of 4 to 6%; step c, providing a second reaction tank for oxidation, adding the ferrous sulfate semi-finished product, water, and sulfuric acid into the second reaction tank, heating the mixture to a temperature of 30 to 45 DEG C, and adding hydrogen peroxide to obtain polymeric ferric sulfate, wherein the volume ratio of ferrous sulfate semi-finished product to water to sulfuric acid to hydrogen peroxide is 100:1:3:3.

Description

Technical field [0001] The present invention relates to a preparation method of polyferric sulfate, in particular to a preparation method of polyferric sulfate with simple equipment, short production period, and being used in industrial production to reduce equipment investment and production links, and reduce equipment costs. Background technique [0002] Sulfuric acid has been used in hundreds of industrial applications ranging from metal surface treatment to food manufacturing. Some uses include pickling process, oil refining, fertilizer manufacturing, pulp and paper manufacturing, and for the manufacture of printed circuit boards, semiconductors and silicon wafers. In fact, sulfuric acid is the most widely used chemical in the world, and the United States consumes more than 38 million metric tons each year. The use of most (if not all) of these sulfuric acids will generate large amounts of waste sulfuric acid containing all types of inorganic and organic pollutants. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/14
Inventor 郑博仁
Owner YOUDING YONGAN OPTOELECTRONICS MATERIAL
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