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A kind of refining method of electronic grade ferrous sulfate solution and electronic grade ferrous sulfate

The technology of a ferrous sulfate solution and a refining method, which is applied in directions such as ferric sulfate, can solve problems such as non-detection, achieve the effects of low production cost, ensure safety in use, and be beneficial to popularization and application.

Active Publication Date: 2022-03-08
YIXING HUAYI COLORING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the above invention patents did not detect indicators such as Gr, As, Pb, Hg, Co, Ba, Sb, Se, Ti, etc.

Method used

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  • A kind of refining method of electronic grade ferrous sulfate solution and electronic grade ferrous sulfate
  • A kind of refining method of electronic grade ferrous sulfate solution and electronic grade ferrous sulfate
  • A kind of refining method of electronic grade ferrous sulfate solution and electronic grade ferrous sulfate

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Experimental program
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Effect test

Embodiment 1

[0056] The refining of embodiment 1, ferrous sulfate solution

[0057] (1), at normal temperature, take 222g of ferrous sulfate, a by-product of titanium dioxide, and dissolve it in an appropriate amount of water to prepare a ferrous sulfate solution with a concentration of (40±2)g / 100ml, and detect that its pH is 2.6; Concentration is 10% sodium hydroxide solution to adjust its pH to 4.5, stir 30min, filter, obtain the filtrate that 500ml removes titanium, detect the concentration of ferrous sulfate heptahydrate in the filtrate to be 40.6g / 100ml;

[0058] (2), the filtrate of step (1) gained is warmed up to 35 ℃, and is that the pH of filtrate is adjusted to 6.5 with the sodium hydroxide solution of 10% by mass concentration, then drips the sodium sulfide nonahydrate solution 23.3 of 10% by mass concentration g, took 4 minutes, continued to stir for 2 hours; then added dropwise a sodium hydroxide solution with a mass concentration of 10% to adjust the pH to 6.7, and the pH ad...

Embodiment 2

[0063] The refining of embodiment 2, ferrous sulfate solution

[0064] (1), at normal temperature, take 222g of ferrous sulfate, a by-product of titanium dioxide, and dissolve it in an appropriate amount of water to prepare a ferrous sulfate solution with a concentration of (40±2)g / 100ml, and detect that its pH is 2.6; The concentration is 10% sodium hydroxide solution to adjust its pH to 5, stir for 60min, settle to get the supernatant, obtain 500ml of the supernatant that removes titanium, and detect the concentration of ferrous sulfate in the supernatant to be 40.31g / 100ml;

[0065] (2), the supernatant of step (1) gained is warmed up to 40 ℃, and is that the pH of filtrate is adjusted to 6.7 with the sodium hydroxide solution of 10% mass concentration, then drips the sodium sulfide nonahydrate that is 10% mass concentration Solution 23.3g, spent 4 minutes, continued to stir for 1.5 hours; then dropwise added a sodium hydroxide solution with a mass concentration of 10% to a...

Embodiment 3

[0069] The refining of embodiment 3, ferrous sulfate solution

[0070] (1), at normal temperature, take 222g of ferrous sulfate, a by-product of titanium dioxide, and dissolve it in an appropriate amount of water to prepare a ferrous sulfate solution with a concentration of (40±2)g / 100ml, and detect that its pH is 2.6; Concentration is 10% sodium hydroxide solution to adjust its pH to 4.8, stir 40min, filter, obtain the filtrate that 500ml removes titanium, detect the concentration of ferrous sulfate heptahydrate in the filtrate to be 40.171g / 100ml;

[0071] (2), the supernatant liquid of step (1) gained is warmed up to 45 ℃, and is that the pH of filtrate is adjusted to 6.9 with the sodium hydroxide solution of 10% mass concentration, then drips the sodium sulfide nonahydrate that is 10% mass concentration Solution 23.3g, spent 4 minutes, continued to stir for 2 hours; then dropwise added a mass concentration of 10% sodium hydroxide solution to adjust the pH to 6.9, the pH ad...

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Abstract

The invention discloses a method for refining an electronic-grade ferrous sulfate solution, which comprises the following steps: (1) taking the by-product ferrous sulfate solution of titanium dioxide, adjusting the pH to 4.5-5, stirring for 0.1-3 hours, separating and precipitating, and removing Titanium ferrous sulfate solution; (2), control the temperature of the ferrous sulfate solution for titanium removal at 20-50°C, adjust the pH to 6.5-7, and then add an appropriate amount of ferrous sulfate solution to ionize S 2‑ sulfide solid, or drop an appropriate amount of sulfide aqueous solution, then continue to stir for 0.5 to 3 hours, adjust the pH to 6.5 to 7, continue to stir for 0.1 to 3 hours, separate and precipitate, and obtain a ferrous sulfate refined solution; (3), Adjust the pH of the ferrous sulfate refining solution to 2.5-2.8. The refining method of the present invention has cheap and easy-to-obtain raw materials, and by controlling the pH and temperature within an appropriate range, the heavy metal content in the titanium dioxide by-product ferrous sulfate can be effectively removed to meet the requirements of electronic grade ferrous sulfate, and the production cost is significantly reduced .

Description

technical field [0001] The invention belongs to the technical field of refining titanium dioxide by-product ferrous sulfate, and in particular relates to a method for refining an electronic-grade ferrous sulfate solution and the obtained electronic-grade ferrous sulfate. Background technique [0002] Ferrous sulfate, also known as green vitriol, can be used to make iron salt, iron oxide pigment, mordant, water purifier, preservative, disinfectant, etc. It has various industrial and medicinal uses. Industrial uses such as: used for flocculation purification of water, and removal of phosphate from urban and industrial sewage to prevent eutrophication of water bodies; used as a reducing agent, mainly to reduce chromate in cement; used as a colorant for Printing and dyeing industry; used to dye concrete into yellow rust color; used in agriculture as iron fertilizer, pesticide and fertilizer; used in analytical chemistry field as chromatographic analysis reagent. Medicinal uses...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/14
CPCC01G49/14C01P2006/80
Inventor 蔡芸马利群施险峰张立洋
Owner YIXING HUAYI COLORING TECH CO LTD
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