Titanium dioxide acid wastewater treatment and recovery process

A technology of acid wastewater and titanium dioxide, which is applied in water/sewage treatment, heating water/sewage treatment, adsorbed water/sewage treatment, etc., can solve problems such as environmental damage, achieve significant benefits in energy saving and emission reduction, and realize the recycling of water resources Effect

Pending Publication Date: 2021-06-11
SHANDONG YUXIN ENVIRONMENTAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Limestone or calcium carbide mud is usually used to neutralize acidic wastewater, but a large amount of iron-containing calcium sulfate waste residue will be produced accordingly. Some of these waste residues are buried deep, and some are directly stacked in the open air. Big damage, so must be dealt with

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The titanium dioxide acidic waste water treatment and recovery process described in the present embodiment 1 is made up of the following steps:

[0045] (1) Titanium dioxide acidic waste water enters the ultrafiltration system and is filtered through the hollow fiber ultrafiltration membrane to obtain the membrane filtrate;

[0046] (2) The membrane filtrate obtained in step (1) enters the ion exchange system and is adsorbed by resin, and the waste water containing iron salt obtained by separation reclaims iron salt for reuse, and the resin adsorbed by free acid is cleaned to obtain relatively pure dilute sulfuric acid;

[0047] (3) The relatively pure dilute sulfuric acid obtained in step (2) is pumped into the nanofiltration system for filtration, and the membrane permeate is pure sulfuric acid, which is then concentrated through multiple-effect evaporation to obtain ≥50% clean sulfuric acid for reuse in titanium White powder production system.

[0048] in:

[0049]...

Embodiment 2

[0068] Titanium dioxide acidic waste water treatment and recycling process described in the present embodiment 2 is made up of the following steps:

[0069] (1) Titanium dioxide acidic waste water enters the ultrafiltration system and is filtered through the hollow fiber ultrafiltration membrane to obtain the membrane filtrate;

[0070] (2) The membrane filtrate obtained in step (1) enters the ion exchange system and is adsorbed by resin, and the waste water containing iron salt obtained by separation reclaims iron salt for reuse, and the resin adsorbed by free acid is cleaned to obtain relatively pure dilute sulfuric acid;

[0071] (3) The relatively pure dilute sulfuric acid obtained in step (2) is pumped into the nanofiltration system for filtration, and the membrane permeate is pure sulfuric acid, which is then concentrated through multiple-effect evaporation to obtain ≥50% clean sulfuric acid for reuse in titanium White powder production system.

[0072] in:

[0073] In...

Embodiment 3

[0092] The titanium dioxide acidic waste water treatment and recovery process described in the present embodiment 3 is made up of the following steps:

[0093] (1) Titanium dioxide acidic waste water enters the ultrafiltration system and is filtered through the hollow fiber ultrafiltration membrane to obtain the membrane filtrate;

[0094] (2) The membrane filtrate obtained in step (1) enters the ion exchange system and is adsorbed by resin, and the waste water containing iron salt obtained by separation reclaims iron salt for reuse, and the resin adsorbed by free acid is cleaned to obtain relatively pure dilute sulfuric acid;

[0095] (3) The relatively pure dilute sulfuric acid obtained in step (2) is pumped into the nanofiltration system for filtration, and the membrane permeate is pure sulfuric acid, which is then concentrated through multiple-effect evaporation to obtain ≥50% clean sulfuric acid for reuse in titanium White powder production system.

[0096] in:

[0097]...

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Abstract

The invention belongs to the technical field of wastewater treatment, and particularly relates to a titanium dioxide acid wastewater treatment and recovery process. The titanium dioxide acid wastewater enters an ultrafiltration system and is filtered by a hollow fiber ultrafiltration membrane to obtain membrane filtrate; the obtained membrane filtrate enters an ion exchange system and is adsorbed by resin, ferric salt is recycled from wastewater containing ferric salt obtained through separation, the resin adsorbing free acid is cleaned, and relatively pure dilute sulfuric acid is obtained; and the obtained relatively pure dilute sulfuric acid is pumped into a nanofiltration system to be filtered, membrane permeate is pure sulfuric acid, then multi-effect evaporation and concentration are carried out, and clean sulfuric acid with the concentration larger than or equal to 50% is obtained and reused in a titanium dioxide production system. According to the titanium dioxide acid wastewater treatment and recovery process, sulfuric acid, water and ferrous iron in the acid wastewater are efficiently separated and can be completely reused in the production process for recycling or resource reutilization, and finally zero emission of the titanium dioxide acid wastewater is achieved.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a titanium dioxide acid wastewater treatment and recovery process. Background technique [0002] Titanium dioxide is considered to be a white pigment with the best performance in the world at present, and it is also an important raw material in the chemical industry, and its application range is very wide. Titanium dioxide can be used as pigments and fillers in coatings, plastics, inks, papermaking, rubber, ceramics, etc., and can also be used as additives in chemical fibers, electronics, food, and medicine. [0003] At present, the industry of titanium dioxide is mature, and the production processes include sulfuric acid method and chlorination method. The sulfuric acid method has mature production technology and can produce two types of titanium dioxide products, anatase and rutile. The advantage is that it can use ilmenite and sulfuric acid that are c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01B17/90C01G23/053C01G49/14
CPCC02F9/00C01B17/90C01B17/901C01G49/14C01G23/053C02F1/28C02F1/444C02F1/442C02F1/04
Inventor 刘瑾付光亮邓晓宇昃叶梅潘平平刘宁薛忠强
Owner SHANDONG YUXIN ENVIRONMENTAL SCI & TECH
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