Method for treating titanium dioxide wastewater through sulfuric acid process

A technology of titanium dioxide wastewater and treatment methods, which is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., and can solve problems such as high water content, large land occupation, and difficulty in application

Active Publication Date: 2014-10-08
TONGLING CHEM IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Due to the hydration of a large amount of iron ions, titanium gypsum has high water content and high viscosity, making it difficult to apply. St...

Method used

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  • Method for treating titanium dioxide wastewater through sulfuric acid process

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Embodiment 1

[0034] Embodiment 1: (1) The first-stage first-wash wastewater whose sulfuric acid concentration in the metatitanic acid first-wash section is not less than 5%, that is, the first-wash wastewater corresponding to the first 2h part of the first wash, is separated separately and sent to the acidification tank, This part of the H in the wastewater 2 SO 4 The average concentration is 10.50%, and the content of Fe is 1.77%; (2) Collect the acid wastewater produced in the second stage of the metatitanic acid washing section and other sections to the wastewater homogenization tank for homogenization, and measure the homogenization H in the waste water 2 SO 4 The concentration is 1.8%, the content of Fe is 0.15%, neutralized with calcium carbide slag or lime to pH: 7, and oxidized by air for 1 hour to obtain neutralized slurry a; (3) send neutralized slurry a into The dense pool settles for 1 hour, and the supernatant is discharged after reaching the standard, and the dense slurry ...

Embodiment 2

[0035] Embodiment 2: (1) Separate the wastewater from the first washing in the metatitanic acid first washing section with a sulfuric acid concentration of not less than 7%, that is, the first washing wastewater corresponding to the part 1.5h before the first washing, and send it to the acidification tank , this part of a washing wastewater H 2 SO 4 The average concentration is 12.50%, and the content of Fe is 1.9%; (2) Collect the acid waste water produced in the second stage of the metatitanic acid washing process and other processes in the waste water homogenization tank for homogenization, and measure the homogenization H in the waste water 2 SO 4 The concentration is 1.85%, the content of Fe is 0.16%, neutralize with calcium carbide slag or lime to pH: 8, and pass through the air to oxidize for 2 hours to obtain the neutralized slurry a; (3) send the neutralized slurry a into The dense pool settles for 1 hour, and the supernatant is discharged after reaching the standa...

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Abstract

The invention relates to a method for treating titanium dioxide wastewater through a sulfuric acid process. The method comprises the steps of feeding front-section primarily washed wastewater with sulfuric acid concentration being not less than 5% in the metatitanic acid primary washing section into an acidizing tank, homogenizing others, then neutralizing by using carbide slag or lime and introducing air for oxidizing, precipitating, discharging supernate out, feeding thick slurry into the acidizing tank, stirring and separating solid from liquid so as to obtain common precipitated gypsum, feeding the mixed solution of ferric sulfate and ferrous sulfate into a neutralizing pool, neutralizing by using magnesite powder, separating solid from liquid to obtain iron sludge containing ferric sulfate and iron sesquioxide. The method does not generate titanium gypsum, the problem that the stacked titanium gypsum occupies lots of land and pollutes the environment since titanium gypsum is difficult to us is solved, the content of Fe in dry residue of the iron sludge is more than 55%, and Fe can be recycled to be used as raw material of ironmaking.

Description

technical field [0001] The invention relates to a method for treating titanium dioxide wastewater produced in a sulfuric acid process titanium dioxide production process. Background technique [0002] A large amount of acidic wastewater will be generated during the production of sulfuric acid titanium dioxide, and 40-60 tons of wastewater can be generated for every 1 ton of titanium dioxide produced. The main impurities in titanium dioxide wastewater are sulfuric acid and ferrous sulfate, and a small amount of metatitanic acid, the sulfuric acid content is 1.5-3%, and the iron content is 0.2-0.4%. This wastewater cannot be discharged directly. [0003] At present, the neutralization method of alkaline substances is generally used to treat titanium dioxide wastewater: first, the homogenized titanium dioxide wastewater is directly neutralized to pH: 8.0 with calcium carbide slag or lime, and then oxidized by air, and the standard is achieved through solid-liquid separation w...

Claims

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Application Information

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IPC IPC(8): C02F9/04
Inventor 潘建崔应虎胡成军罗自力杜娟
Owner TONGLING CHEM IND GRP
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