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Membrane treatment method for sulfate process titanium dioxide waste acid

A technology of titanium dioxide waste acid and sulfuric acid method, applied in sulfur trioxide/sulfuric acid, chemical instruments and methods, sulfur compounds, etc., can solve the problems of few, membrane damage, strong corrosion of iron-containing waste acid, etc. The acid quality is good, the economic benefit is great, and the effect of reducing environmental pollution and environmental protection pressure

Inactive Publication Date: 2018-11-02
LOMON BILLIONS GRP CO LTD
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  • Summary
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AI Technical Summary

Problems solved by technology

In terms of environmental protection, it is mainly used for waste water recycling and treatment. Because iron-containing waste acid is highly corrosive and easily causes irreversible damage to the membrane, membrane separation technology is rarely used for treatment.

Method used

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  • Membrane treatment method for sulfate process titanium dioxide waste acid

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Experimental program
Comparison scheme
Effect test

Embodiment

[0024] Such as figure 1 As shown, the raw material is the waste acid obtained by pressure filtration after the sulfuric acid process titanium dioxide solution is hydrolyzed, and the indicators are as follows:

[0025] serial number

project

unit

index

1

temperature

℃

63

2

Sulfuric acid concentration

％

17

3

Conductivity

µs / cm

14750

4

Fe 2+

mg / l

55670

5

Ca 2+

mg / l

2300

6

Mg 2+

mg / l

5230

[0026] Step1. The waste acid is first cooled to 40±2°C through heat exchange;

[0027] Step2. Remove suspended solids through sand filtration and bag filtration to prevent residual metatitanic acid and other impurities from entering the membrane system to block the membrane pores;

[0028] Step3. Then enter the membrane separation system for three-stage separation treatment, and finally obtain transparent clean acid and waste acid enriched with metal ion impurities...

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Abstract

The invention discloses a membrane treatment method for sulfate process titanium dioxide waste acid. The concentration of H2SO4 in the waste acid is about 20wt%, the temperature of the waste acid is 60-70 DEG C, the iron content of the waste acid is 50-70g / L, and the waste acid contains other metal ion impurities. The membrane treatment method includes: using heat exchanging to lower the temperature to 35-45 DEG C; filtering the waste acid to remove solid suspended matter; feeding the waste acid obtained after the solid impurities are removed into a membrane separation system to perform separation, and using the clean acid obtained after the membrane separation as the absorption acid to produce concentrated sulfuric acid; mixing the waste acid, containing a large number metal ion impurities, separated from the other side with 98wt% concentrated sulfuric acid to obtain sulfuric acid with the concentration being 50-60wt%; curing the mixed solution, and performing filter pressing and separation to obtain sulfuric acid, wherein the obtained sulfuric acid can be used as the initiating acid of a sulfate process titanium dioxide acidolysis procedure. The membrane method has the advantagesthat an organic membrane is directly used to treat the sulfate process titanium dioxide waste acid, and the method is small in equipment floor space, simple to operate, good in clean acid quality andcapable of reducing waste acid discharge.

Description

technical field [0001] The invention relates to the technical field of titanium dioxide production, in particular to a method for treating titanium dioxide waste acid film by sulfuric acid process. Background technique [0002] China is one of the countries that mainly produce titanium dioxide in the world. At present, the sulfuric acid method is still mainly used, which will produce a large amount of waste acid. For every 1 ton of titanium dioxide produced, about 7 tons of waste acid with a sulfuric acid content of about 20% will be produced, and contain a large amount of waste acid. Ferrous sulfate and other metal impurities are difficult to recycle. Generally, they are discharged after reaching the standard through legal treatment. The treated wastewater has a high salt content, and a large amount of solid by-product yellow gypsum is produced. The treatment of waste acid is the main factor of environmental pollution in the production of sulfuric acid titanium dioxide, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/90
CPCC01B17/902
Inventor 陈建立牛萌叶新友肖莎莎冯娜王嘉雍
Owner LOMON BILLIONS GRP CO LTD
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