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Integrated membrane treatment and recovery technology and apparatus for waste acid in production process of titanium dioxide

A production process and recovery device technology, applied in the direction of filtration treatment, multi-stage water treatment, water/sewage treatment, etc., can solve the problems that cannot be achieved and cannot be made into high-concentration pure sulfuric acid, so as to reduce the concentration, save costs, Reduces clogging and damage effects

Active Publication Date: 2016-03-30
JIANGSU JIUWU HITECH
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  • Claims
  • Application Information

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Problems solved by technology

CN103663547A discloses this membrane separation treatment process, but what it handles is actually a kind of acid wastewater, containing 0.3-4% sulfuric acid, 1500-2500 mg / L iron ion, and low acid and iron ion concentration, so it can Nanofiltration membrane is used for desalination, but it cannot separate ferrous sulfate from sulfuric acid for sulfuric acid with iron ion concentration greater than 40g / L and 20% or more in the range of 0.1-1MPa
CN104692456A has also announced a nanofiltration membrane titanium dioxide waste acid treatment process, although the pressure of the treatment has increased, it still cannot achieve the purpose of iron ions below 1g / L after the primary treatment
Therefore, after treatment, the clear liquid can only be sent to the calcination kiln to be used as a spray liquid for the calcination tail gas, and it cannot be made into high-concentration and high-purity sulfuric acid for use.

Method used

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  • Integrated membrane treatment and recovery technology and apparatus for waste acid in production process of titanium dioxide
  • Integrated membrane treatment and recovery technology and apparatus for waste acid in production process of titanium dioxide
  • Integrated membrane treatment and recovery technology and apparatus for waste acid in production process of titanium dioxide

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Embodiment 1

[0053] After the waste acid passes through the pre-filter 1, it enters the waste acid storage tank 2, and then is sent to the first filter 3 for solid-liquid separation, which uses a ceramic membrane with a pore size of 0.2 μm. When the content of titanic acid reaches 200g / L, the metatitanic acid is recovered by the third filter 4 (using a plate and frame filter press), and the filtrate of the plate and frame filter press is returned to the waste acid storage tank 2 and the ceramic membrane is used to recover the metatitanic acid again. Waste acid.

[0054] The waste acid clear liquid filtered by the ceramic membrane enters the crystallization device 5, and the freezing and crystallization temperatures are controlled at -6°C, -2°C, and 2°C, respectively. The frozen and crystallized crystal mixed slurry is vacuum filtered by the second filter (disc filter) 6, and the vacuum degree is controlled at 0.07MPa to obtain ferrous sulfate crystals and crystallization mother liquor. Af...

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Abstract

The invention relates to an integrated membrane treatment and recovery technology and apparatus for waste acid in production process of titanium dioxide, and specifically relates to recovery of metatitanic acid, ferrous sulphate, sulfuric acid and other valuable resources in waste acid generated in the production process of titanium dioxide by using the integrated membrane treatment technology, and belongs to the field of production of titanium dioxide. The technology and apparatus aim at sulfuric acid of high concentration with high ferric salt content, a plurality of separating technologies are used, and traditional technologies (crystallization and filtering technology) are integrated, so that the ferric salt in the waste sulfuric acid is removed, sulfuric acid is condensed to about 70%, usage efficiency of sulfuric acid is improved, and water of high quality is produced for reuse process.

Description

technical field [0001] The present invention relates to a waste acid membrane integrated treatment and recovery process and device in the production process of titanium dioxide, in particular to a process for recovering metatitanic acid, ferrous sulfate and Valuable resources such as sulfuric acid belong to the field of titanium dioxide production. Background technique [0002] In the process of producing titanium dioxide by the sulfuric acid method, about 8-10t20% of waste acid will be produced for every 1t of titanium dioxide produced. In addition to the main component H, the waste acid contains 2 SO 4 In addition, it also contains a certain amount of FeSO 4 、TiO 2 、Al 2 (SO 4 ) 3 , MgSO 4 and other substances, and their compositions are shown in Table 1. 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 r...

Claims

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Application Information

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IPC IPC(8): C01B17/90C01B17/88C02F9/10
CPCC01B17/88C01B17/901C02F1/001C02F1/44C02F1/442C02F9/00C02F2001/5218C02F2301/08
Inventor 王志高黄世伟肖维溢丁邦超王肖虎邓唯彭文博范克银
Owner JIANGSU JIUWU HITECH
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