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Method for producing industrial-grade magnesium sulfate by using titanium white waste acid

A technology of titanium dioxide waste acid and magnesium sulfate, which is applied in magnesium sulfate and other directions, can solve the problems of difficulty in coordinating the quality and production cost of magnesium sulfate products, greatly reducing the content of magnesium sulfate, and increasing the solid content of acid hydrolysis slurry, so as to reduce the Processing difficulty, significant economic benefits, and the effect of reducing production costs

Active Publication Date: 2014-10-29
SICHUAN LOMON TITANIUM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the solubility of ferrous sulfate in titanium dioxide waste acid is similar to that of magnesium sulfate, when controlling a higher concentration of magnesium sulfate, ferrous sulfate and magnesium sulfate will crystallize and precipitate during the reaction process, and the production cannot proceed normally.
In addition, for the slurry after acidolysis, due to the high ferrous sulfate in the waste acid and the acidolysis residue of magnesium ore, the purification and removal of impurities will lead to the difficulty of increasing the solid content of the acidolysis slurry and greatly reducing the magnesium sulfate content, so it needs to be returned A large amount of magnesium sulfate crystallization mother liquor is used to control the solid content of the slurry to ensure normal production. The concentration of magnesium sulfate caused by impurity removal is reduced, and the concentration process is also required
Therefore, the use of titanium white waste acid to produce magnesium sulfate is all low-concentration acid hydrolysis + concentration process to prepare magnesium sulfate, which will lead to extremely low utilization rate of production equipment, increased production energy consumption, and increased production costs
[0005] In summary, the production of magnesium sulfate from titanium white waste acid has become a difficult problem to coordinate with the product quality and production cost of magnesium sulfate

Method used

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  • Method for producing industrial-grade magnesium sulfate by using titanium white waste acid

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Embodiment 1

[0028] Titanium dioxide waste acid, its main component, is calculated by mass ratio as: H 2 SO 4 20.11%, FeSO 4 8.78%, Al 2 (SO4) 3 0.57% MgSO 4 2.07%, TiO 2 0.34%, after countercurrent spraying and rotary kiln calcination tail gas, use the waste heat of calcination tail gas to enrich to H 2 SO 4 28%, and then recover metatitanic acid by waste acid flocculation and sedimentation to obtain clear waste acid. Add the clear waste acid to the waste acid preparation tank, and slowly add concentrated sulfuric acid with a sulfuric acid mass fraction of 98% under stirring conditions, add 1.99t concentrated sulfuric acid for every 5t of 28% waste acid, and mix the two evenly to obtain a mixed acid. Then slowly cool down and mature, the gradient cooling range is 8°C / h, the end point temperature is 60°C, and after aging for 1 hour, all the mixed acid is poured into a filter press for solid-liquid separation, and concentrated acid is obtained after separation, with a mass f...

Embodiment 2

[0030] The waste acid in the production process of titanium dioxide, its main component, is calculated by mass ratio as: H 2 SO 4 20.11%, FeSO 4 8.78%, Al 2 (SO4) 3 0.57% MgSO 4 2.07%, TiO 2 0.34%, after countercurrent spraying and rotary kiln calcination tail gas, use the waste heat of calcination tail gas to enrich to H 2 SO 4 28%, and then recover metatitanic acid by waste acid flocculation and sedimentation to obtain clear waste acid. Add the clear waste acid to the waste acid preparation tank, slowly add concentrated sulfuric acid with a sulfuric acid mass fraction of 98% under stirring conditions, add 1.53t concentrated sulfuric acid for every 5t of 28% waste acid, and mix the two evenly to obtain a mixed acid. Then carry out slow cooling and cooling, aging, the range of gradient cooling is 8°C / h, the end point temperature is 60°C, and after aging for 1 hour, all the mixed acid is poured into a filter press for solid-liquid separation, and the concentrate...

Embodiment 3

[0032] The waste acid in the production process of titanium dioxide, its main component, is calculated by mass ratio as: H 2 SO 4 20.11%, FeSO 4 8.78%, Al 2 (SO4) 3 0.57% MgSO 4 2.07%, TiO 2 0.34%, after countercurrent spraying and rotary kiln calcination tail gas, use the waste heat of calcination tail gas to enrich to H 2 SO 4 28%, and then recover metatitanic acid by waste acid flocculation and sedimentation to obtain clear waste acid. Add the clear waste acid to the waste acid preparation tank, and slowly add concentrated sulfuric acid with a sulfuric acid mass fraction of 98% under stirring conditions, add 1.99t concentrated sulfuric acid for every 5t of 28% waste acid, and mix the two evenly to obtain a mixed acid. Then slowly cool down and mature, the gradient cooling range is 8°C / h, the end point temperature is 60°C, and after aging for 1 hour, all the mixed acid is poured into a filter press for solid-liquid separation, and concentrated acid is obtaine...

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Abstract

The invention relates to a method for producing industrial-grade magnesium sulfate by using titanium white waste acid. According to the method, the titanium white waste acid is purified by using a manner of preparing acid and concentrating, so that the influence of salts such as ferrous sulfate in the titanium white waste acid on preparation of industrial-grade magnesium sulfate heptahydrate is reduced; purified and concentrated acid reacts with caustic-burned magnesia powder; the purification treatment is carried out by adjusting pH value by using acetylene sludge or lime milk; impurities in the magnesium sulfate can be effectively removed by using a manner of oxidizing by using hydrogen peroxide and re-adjusting the pH value by using pure sulfuric acid under alkaline conditions; the titanium white waste acid is used for preparing acid and concentrating so as to react with the caustic-burned magnesia powder, so that the concentration process for preparing magnesium sulfate by using titanium white waste acid is cancelled, the application range of the titanium white waste acid is expanded; and the method for producing industrial-grade magnesium sulfate by using titanium white waste acid is simple in production process, small in investment, low in cost, high in yield and high in product purity. The overall process is free of waste and byproduct, remarkable in social benefit and great in economic benefit.

Description

technical field [0001] The invention relates to a method for producing magnesium sulfate from waste acid, in particular to a method for producing industrial grade magnesium sulfate from titanium white waste acid by sulfuric acid process. 【Background technique】 [0002] The production of 1 ton of titanium dioxide by the sulfuric acid method requires the consumption of more than 4 tons of sulfuric acid, and at the same time produces 6 to 8 tons of waste acid with a concentration of 20 to 25%. In addition to the main component H in the waste acid 2 SO 4 In addition, it also contains a certain amount of FeSO 4 、TiO 2 , A1 2 (SO4) 3 , MgSO 4 and other substances. If these waste acids are discharged directly without treatment, it will not only pollute the environment, but also cause a serious waste of resources. How to deal with these waste acids and economically and rationally recover the valuable parts has become an important technical problem in the production of sulfur...

Claims

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Application Information

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IPC IPC(8): C01F5/40
Inventor 文军范先国周晓葵朱全芳
Owner SICHUAN LOMON TITANIUM IND CO LTD
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