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Method for treating and recycling sulfuric acid process titanium dioxide effluent

A technology of drainage treatment and sulfuric acid method, which is applied in natural water treatment, multi-stage water treatment, water/sewage treatment, etc. It can solve the problems of low water dispersibility of titanium dioxide and discount of pigment application performance, and achieve qualified quality and treatment cost. Low, good operating effect

Active Publication Date: 2021-01-22
CNMC GUANGXI PGMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is the higher concentration of Mg in the external drainage 2+ , Ca 2+ , if it is returned to the metatitanic acid water washing process for use, the prepared titanium dioxide will contain high calcium and magnesium, which will eventually cause the water dispersibility of titanium dioxide to be too low, and its pigment application performance will be greatly reduced

Method used

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  • Method for treating and recycling sulfuric acid process titanium dioxide effluent
  • Method for treating and recycling sulfuric acid process titanium dioxide effluent

Examples

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Embodiment 1

[0031] A method for treating and recycling titanium dioxide external wastewater by sulfuric acid process, comprising the following steps:

[0032] Take sulfuric acid process titanium dioxide external drainage, its index: pH=7, Mg 2+ = 160 mg / l, Ca 2+ = 550 mg / l, SS = 15 mg / l;

[0033]While blowing air, turn on the mechanical stirring, pump the external drainage of sulfuric acid titanium dioxide into the reaction tank, add KOH solution, adjust to pH = 11, stir for 30 minutes, and separate the solid and liquid through the diaphragm filter press to obtain the first The filtrate and the first solid, the first solid being Mg(OH) 2 ; After testing, magnesium ion content Mg in the first filtrate 2+ = 8mg / l;

[0034] While blowing air, turn on mechanical stirring, pump the first filtrate into the reaction tank, add oxalic acid solution, adjust to pH = 2, stir for 30 minutes, and separate the solid and liquid through a diaphragm filter press to obtain the second filtrate and the se...

Embodiment 2

[0043] A method for treating and recycling titanium dioxide external wastewater by sulfuric acid process, comprising the following steps:

[0044] Take sulfuric acid process titanium dioxide external drainage, its index: pH=7.5, Mg 2+ = 170 mg / l, Ca 2+ = 560 mg / l, SS = 18 mg / l;

[0045] While blowing air, turn on the mechanical stirring, pump the external drainage of sulfuric acid titanium dioxide into the reaction tank, add KOH solution, adjust to pH = 12.5, stir for 30 minutes, and separate the solid and liquid through the diaphragm filter press to obtain the first The filtrate and the first solid, the first solid being Mg(OH) 2 ; After testing, magnesium ion content Mg in the first filtrate 2+ = 5mg / l;

[0046] While blowing air, turn on mechanical stirring, pump the first filtrate into the reaction tank, add oxalic acid solution, adjust to pH = 1.5, stir for 30 minutes, and separate the solid and liquid through a diaphragm filter press to obtain the second filtrate and...

Embodiment 3

[0055] A method for treating and recycling titanium dioxide external wastewater by sulfuric acid process, comprising the following steps:

[0056] Take sulfuric acid process titanium dioxide external drainage, its index: pH=8.5, Mg 2+ = 165 mg / l, Ca 2+ = 580 mg / l, SS = 16 mg / l;

[0057] While blowing air, turn on the mechanical stirring, pump the external drainage of sulfuric acid titanium dioxide into the reaction tank, add KOH solution, adjust to pH = 11.5, stir for 30 minutes, and separate the solid and liquid through the diaphragm filter press to obtain the first The filtrate and the first solid, the first solid being Mg(OH) 2 ; After testing, magnesium ion content Mg in the first filtrate 2+ = 7mg / l;

[0058] While blowing air, turn on the mechanical stirring, pump the first filtrate into the reaction tank, add an oxalic acid solution with an oxalic acid content ≥ 99%, adjust to pH=1.8, stir for 30 minutes, and separate the solid and liquid through a membrane filter p...

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Abstract

The invention discloses a method for treating and recycling a sulfuric acid process titanium dioxide effluent. The method comprises the following steps: adding a strong alkali solution into the sulfuric acid method titanium dioxide effluent; stirring and filtering; adding an oxalic acid solution into a first filtrate, stirring and filtering; and adding a strong alkali solution into a second filtrate, and adjusting the pH value to 6-9; wherein the strong base is one or a combination of more of KOH and NaOH. The method is convenient to operate and good in treatment effect, the treated water canbe directly reused in the metatitanic acid washing procedure, titanium dioxide prepared from metatitanic acid subjected to washing through salt treatment, filter pressing, calcination and grinding isqualified in water dispersibility and normal in pigment performance, and zero discharge of discharged water can be achieved; meanwhile, the method is simple in technological process, stable in treatment effect, low in equipment investment, free of secondary pollution, low in treatment cost, considerable in economic benefit and wide in market prospect.

Description

technical field [0001] The invention relates to the field of wastewater treatment. More specifically, the present invention relates to a method for treating and recovering external wastewater of sulfuric acid titanium dioxide. Background technique [0002] At present, most domestic titanium dioxide factories adopt the sulfuric acid method for production, and a large amount of acidic wastewater is produced in the production process, and the main pollution factor is H 2 SO 4 、TiOSO 4 , FeSO 4 . The wastewater treatment of most titanium dioxide factories uses calcium carbonate to neutralize H 2 SO 4 、TiOSO 4 , and then use milk of lime to neutralize FeSO 4 , obtain titanium gypsum and filtrate by pressure filtration, and then aerate the filtrate to remove the trace amount of Fe in the filtrate 2+ Oxidized to Fe(OH) 3 Precipitation, and finally clarification is external drainage, its indicators: pH=6~9, COD cr =10~20mg / l, NH 3 -N≤1mg / l, SS=5~20mg / l, Mg 2+ =100~200mg...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F103/34
CPCC02F1/5236C02F1/001C02F2103/34C02F2301/08
Inventor 伍佳
Owner CNMC GUANGXI PGMA
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