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Treatment method and device for wastewater from production of titanium dioxide

A technology for the production of wastewater and treatment methods, which is applied in natural water treatment, water treatment parameter control, water/sewage multi-stage treatment, etc. It can solve the problems of easy clogging of membrane pores, difficulty in cleaning and regeneration, and membrane fouling, so as to avoid membrane pollution. Pore ​​clogging, avoiding clogging and reducing membrane fouling

Pending Publication Date: 2018-10-16
JIANGSU JIUWU HITECH
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0007] In order to solve the bottleneck problem of serious membrane fouling, easy clogging of membrane pores, and difficult cleaning, regeneration and recovery in the membrane process, this patented technology starts with the selection of membranes based on the pore size screening mechanism of the membrane, and finds a membrane with a suitable pore size and material to avoid Block the membrane pores, and then optimize the process of the ceramic membrane to reduce the membrane surface pollution caused by the easy adsorption of metatitanic acid or titanium dioxide in the membrane process, and finally clean the polluted membrane by selecting a suitable cleaning process and cleaning agent Regeneration, so that the flux of the ceramic membrane is well regenerated and restored after a period of filtration

Method used

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  • Treatment method and device for wastewater from production of titanium dioxide
  • Treatment method and device for wastewater from production of titanium dioxide

Examples

Experimental program
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Effect test

Embodiment 1

[0075] The same second washing water 1 is treated by the process of the present invention, and enters such as figure 1 Shown in the cross-flow filtration ceramic membrane filtration system. First, the secondary washing water 1 is poured into the ceramic membrane raw material tank a, filtered through the coarse filter d below 1mm through the feed pump c, and then poured into the ceramic membrane filter e for concentrated filtration, and the control pressure is 0.1MPa. The membrane surface velocity is 3m / s, and the temperature is 50°C. The membrane element is an alumina ceramic membrane with a pore size of 50nm. During the filtration process, the product water is used to recoil once every 20 minutes, and the recoil pressure is 0.5MPa. Control the concentration factor to 100. The flux of the membrane is 600~800 L / m 2 h or more. The turbidity of membrane filtration clear liquid 2 reached 0.25 NTU, the amount of metatitanic acid contained was 0, and the solid content of concen...

Embodiment 2

[0079] The same three washing water 1 is processed by the process of the present invention, and enters such as figure 1 Shown in the cross-flow filtration ceramic membrane filtration system. First, the three washing water 1 is pumped into the ceramic membrane raw material tank a, filtered through the coarse filter d below 1mm through the feed pump c, and then pumped into the ceramic membrane filter e for concentrated filtration, and the control pressure is 0.15MPa. The membrane surface velocity is 2.5m / s, and the temperature is 45°C. The membrane element is an alumina ceramic membrane with a pore size of 50nm. During the filtration process, the product water is used to recoil once every 20 minutes, and the recoil pressure is 0.5MPa. The control concentration factor is 150. The flux of the membrane is 550-800 L / m 2 h or more. The turbidity of membrane filtration clear liquid 2 reached 0.25 NTU, the amount of titanium dioxide contained was 0, and the solid content of concen...

Embodiment 3

[0083] The same waste acid 1 is processed by the process of the present invention, and enters such as figure 1 Shown in the cross-flow filtration ceramic membrane filtration system. First, the secondary washing water 1 is poured into the ceramic membrane raw material tank a, filtered through the coarse filter d below 1mm through the feed pump c, and then poured into the ceramic membrane filter e for concentrated filtration, and the control pressure is 0.12MPa. The membrane surface velocity is 3m / s, and the temperature is 50°C. The membrane element is an alumina ceramic membrane with a pore size of 20nm. During the filtration process, the product water is used to recoil once every 10 minutes, and the recoil pressure is 0.5MPa. Control the concentration factor to 100. The flux of the membrane is 200~600 L / m 2 h or more. The turbidity of membrane filtration clear liquid 2 reached 0.25 NTU, the amount of metatitanic acid contained was 0, and the solid content of concentrated ...

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Abstract

The invention relates to a process for concentrating and recovering metatitanic acid or titanium dioxide in wastewater from production of titanium dioxide by using a ceramic membrane, and in particular relates to a process for concentrating and recovering the metatitanic acid or the titanium dioxide in waste acids and wastewater of primary washing, secondary washing and tertiary washing in a sulfuric acid method, and in post-treatment wastewater in a chlorination method by adopting cross-flow filtration ceramic membrane filter equipment. According to a pore size screening mechanism of a membrane, the method is started from membrane selection, and a membrane with a suitable pore size and material is searched to avoid clogging of membrane pores; through process optimization of the ceramic membrane, membrane surface pollution formed by easy adsorption of the metatitanic acid or the titanium dioxide in the membrane process is reduced; and finally, a suitable cleaning process and cleaning agent are selected to clean the contaminated membrane, so that a flux of the ceramic membrane is regenerated and restored. Experimental results show that a stable operation period of the ceramic membrane achieves one month or more, and the flux is always maintained at 500 L / m<2>*h (excluding waste acid), and a membrane cleaning regeneration recovery rate reaches 98% or more.

Description

technical field [0001] The invention relates to a process for concentrating and recovering metatitanic acid or titanium dioxide in titanium dioxide production wastewater by ceramic membranes, in particular to a process for concentrating and recovering waste acid, first washing and second washing in the sulfuric acid process using cross-flow filtration ceramic membrane filtration equipment And three washing wastewater, and the metatitanic acid or titanium dioxide process in post-treatment wastewater in the chlorination method, belong to the field of titanium dioxide chemical industry. Background technique [0002] A large amount of waste acid and waste water are produced during the production of titanium dioxide. It is estimated that the scale of waste acid and waste water produced in the sulfuric acid production process is: waste acid 7~11T / T titanium dioxide, first washing water and second washing water 40~60T / T titanium dioxide, third washing water 10T / T titanium dioxide...

Claims

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Application Information

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IPC IPC(8): C02F9/02B01D65/02B01D69/10B01D71/02B01D63/06C01G23/00C01G23/047C02F103/34
CPCB01D63/06B01D65/02B01D69/10B01D71/024B01D71/025C01G23/00C01G23/0475C02F1/001C02F1/44B01D2321/04B01D2321/164B01D2321/162C02F2209/10C02F2103/34C02F2303/14
Inventor 王志高肖维溢王肖虎彭文博丁邦超熊福军彭跃峰项娟顾俊杰杨积衡范克银
Owner JIANGSU JIUWU HITECH
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