Method for treating titanium dioxide wastewater

A technology for titanium dioxide wastewater and white gypsum, which is applied in multi-stage water treatment, solid waste management, sustainable waste treatment, etc., can solve the problems of low wastewater treatment efficiency, difficult to measure proportion, and unsuitable for large-scale industrial production, etc. Achieve the effect of reducing the cost of calcination and drying

Active Publication Date: 2018-08-07
CNMC GUANGXI PGMA
View PDF4 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its production has only one kind of red gypsum, and its water content is only 37.62% at the lowest, and the operation is complicated. The seed crystal component is gypsum, and the ratio is difficult to measure, so it is not suitable for large-scale industrial production
[0012] In view of the current unreasonable treatment methods for titanium dioxide wastewater, resulting in low wastewater treatment efficiency, it is of great practical and economic significance to make reasonable and scientific improvements to wastewater treatment methods.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for treating titanium dioxide wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for treating titanium dioxide wastewater, comprising the steps of:

[0031] (1) Preparation of white gypsum: pump the homogenized titanium dioxide wastewater into the reaction tank, wherein the main components and concentrations of the homogenized titanium dioxide wastewater are H 2 SO 4 =70.62g / l; TiOSO 4 = 2.34g / l; FeSO 4 =40.10g / l; Stability > 200, at the same time, pump the calcium carbonate stone powder slurry into the reaction tank, under the condition of blasting, mechanically stir, when the pH of the material is detected to be 1.52, stop stirring, and pass through the membrane filter press Separation of solid and liquid to obtain the filtrate of the first stage of activity and white gypsum. The white gypsum is directly used by the cement plant. 3 =43.83%; the test index of filtrate of the first stage of activity: H 2 SO4=18.13g / l, TiOSO 4 =2.15g / l, FeSO 4 =36.84g / l, stability>200;

[0032] (2) Red gypsum active seed crystal preparation: pump the ...

Embodiment 2

[0036] A method for treating titanium dioxide wastewater, comprising the steps of:

[0037] (1) Preparation of white gypsum: pump the homogenized titanium dioxide wastewater into the reaction tank, wherein the main components and concentrations of the homogenized titanium dioxide wastewater are H 2 SO 4 = 68.10 g / l; TiOSO 4 = 3.04g / l; FeSO 4 =38.91g / l; Stability > 200, at the same time, pump the calcium carbonate stone powder slurry into the reaction tank, under the condition of blasting, mechanically stir, when the pH in the material is detected to be 1.62, stop stirring, and pass through the membrane filter press Separation of solid and liquid to obtain the filtrate of the first stage of activity and white gypsum, the white gypsum is directly used by the cement plant, the water content of the white gypsum = 24.86%, SO 3 =44.53%; the test index of filtrate of the first stage of activity: H 2 SO 4 = 17.65g / l, TiOSO 4 = 2.87g / l; FeSO 4 =36.74g / l, Stability>200.

[0038]...

Embodiment 3

[0042] A method for treating titanium dioxide wastewater, comprising the steps of:

[0043] (1) Preparation of white gypsum: pump the homogenized titanium dioxide wastewater into the reaction tank, wherein the main components and concentrations of the homogenized titanium dioxide wastewater are H 2 SO 4 = 65.57g / l; TiOSO 4 =2.71g / l; FeSO 4 =35.26g / l; Stability>200, at the same time, pump the calcium carbonate stone powder slurry into the reaction tank, under the condition of blast, mechanically stir, when the pH=1.62 in the detection material, stop stirring, pass through the membrane filter press Separation of solid and liquid to obtain the filtrate of the first stage of activity and white gypsum, the white gypsum is directly used by the cement plant, the water content of the white gypsum = 25.20%, SO 3 =44.72%; The test index of filtrate of the first stage of activity: H 2 SO 4 = 16.13 g / l, TiOSO 4 =2.56g / l, FeSO 4 =33.26g / l, Stability>200.

[0044] (2) Red gypsum act...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention belongs to the technical field of wastewater treatment and particularly relates to a method for treating titanium dioxide wastewater. The method includes the steps of firstly, preparingwhite gypsum; secondly, preparing red gypsum active seed crystal; thirdly, performing two-stage neutralization; fourthly, performing aeration and sedimentation. The method has the advantages that by reaction end point control, TiSO4 with the stability being not smaller than 100 in active-stage filtrate is hydrolyzed completely to finally generate TiO(OH)2 seed crystal particles which are small anduniform in size so as to obtain the red gypsum active seed crystal; by the end point control, the produced white gypsum is low in water content and can be directly used by a cement factory, red gypsum whose water content is low and SO3 content meets cement production requirements, the calcining and drying procedure of the white gypsum is omitted, the calcining and drying cost of titanium gypsum is lowered greatly, and the water content and the SO3 content of the red gypsum can meet the cement production requirements of the cement factory when the water content is 34-37% and the SO3 content is33-35%; meanwhile, discharged wastewater meets the emission standards of GB8978-1996.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, in particular to a method for treating titanium dioxide wastewater. Background technique [0002] At present, most titanium dioxide factories in China use the sulfuric acid method for production, and the treatment of their titanium dioxide wastewater is basically to prepare titanium gypsum. However, due to the preparation process, the moisture content of the titanium gypsum directly filtered through the filter press is too high. , must be dried before it can be used as a retarder in cement plants. [0003] At present, there are three types of titanium gypsum prepared by titanium dioxide wastewater in domestic sulfuric acid titanium dioxide factories: [0004] The first method: use milk of lime to directly neutralize the titanium white waste acid to pH=8-9, and obtain red gypsum by pressure filtration with a diaphragm filter press, the water content of which is controlled at 39-42%, ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C04B22/14C04B18/04C01F11/46C02F101/10
CPCC01F11/46C02F1/001C02F1/66C02F9/00C02F2001/007C02F2101/101C02F2301/08C04B18/0445C04B22/146Y02W30/91
Inventor 伍佳
Owner CNMC GUANGXI PGMA
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap