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A method for treating rutile titanium dioxide wastewater

A technology for rutile titanium dioxide and waste water, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problem of high energy consumption, no economic benefits, and unbalanced consumption of titanium dioxide Acid waste water and other problems, to achieve the effect of improving recovery efficiency, major economic benefits and environmental protection benefits

Active Publication Date: 2016-03-30
SICHUAN LOMON TITANIUM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For waste sulfuric acid with a concentration of 20%-30%, it can be concentrated and recycled, and for low-concentration acidic wastewater, which contains a large amount of iron ions, most sulfuric acid titanium dioxide processes cannot be used
If it is concentrated, it will consume a lot of energy and has no economic benefits
Chinese patent CN1220970 uses the acid wastewater to react with magnesium oxide to produce magnesium sulfate, which solves environmental problems and creates economic value, but magnesium sulfate is only a small industry, which cannot balance the consumption of acid wastewater produced by titanium dioxide, and eventually wastewater will be discharged
Therefore, if alkaline wastewater is used to absorb calcination tail gas, it will often block the spray pipe due to insoluble titanium and affect the absorption effect, so it can only be transferred to the sewage station for treatment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] will be 10m 3 Transfer the acidic wastewater into the mixing tank, start stirring, and slowly add 6m 3 -7m 3 For alkaline wastewater, control the mixing temperature at 50-60°C, stop stirring after 10-15 minutes, the pH of the mixed solution is between 7-8, and after natural settlement for 60 minutes, the supernatant liquid is transferred to a thickener, and the polypropylene with a concentration of 200ppm The amide was added according to the concentration ratio of 5ppm, mixed and stirred for 30min, and settled for 60min to obtain the lower precipitate (mainly containing TiO 2 155kg), the precipitate is returned to the alkali-soluble storage tank in the calcined seed crystal preparation process to continue pressure filtration, and the neutral water in the upper layer contains sulfate ions and sodium ions, which are used for the production of titanium dioxide after the ions are removed by activated carbon adsorption.

[0025] The lower layer of sediment mixed with acidi...

Embodiment 2

[0027] will be 20m 3 Transfer the acidic wastewater into the mixing tank, start stirring, and slowly add 11m 3 -14m 3For alkaline waste water, control the mixing temperature at 50-60°C, stop stirring after 10-15 minutes, the pH of the mixed solution is between 7-8, and after 60 minutes of natural settlement, the supernatant liquid is transferred to a thickener, and the concentration of 200ppm polypropylene The amide was added into it according to the concentration ratio of 10ppm, mixed and stirred for 30min, and settled for 60min to obtain the lower precipitate (mainly containing TiO 2 286kg), the precipitate is returned to the alkali-soluble storage tank in the calcined seed crystal preparation process to continue pressure filtration, and the neutral water in the upper layer contains sulfate ions and sodium ions, which are used for the production of titanium dioxide after the ions are removed by activated carbon adsorption.

[0028] The lower layer of sediment mixed with ac...

Embodiment 3

[0030] will be 25m 3 Transfer the acidic waste water into the mixing tank, turn on the stirring, and slowly add 15m 3 -17m 3 For alkaline waste water, control the mixing temperature at 50-60°C, stop stirring after 10-15 minutes, the pH of the mixed solution is between 7-8, and after 60 minutes of natural settlement, the supernatant liquid is transferred to a thickener, and the concentration of 200ppm polypropylene The amide was added at a concentration ratio of 8ppm, mixed and stirred for 30 minutes, and settled for 60 minutes to obtain the lower layer of precipitate (mainly containing TiO 2 341kg), the precipitate is returned to the alkali-soluble storage tank in the calcined seed crystal preparation process to continue pressure filtration, and the neutral water in the upper layer contains sulfate ions and sodium ions, which are used for titanium dioxide production after being adsorbed by activated carbon to remove ions.

[0031] The lower layer of sediment mixed with acidi...

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Abstract

The invention discloses a method for treating rutile titanium dioxide waste water. The method comprises the following three steps of: (1) mixing acid waste water and alkaline waste water, stirring, then naturally depositing to obtain a supernatant and bottom deposits, and controlling mixing temperature to 50-60 DEG C, wherein the pH value of a solution is 7-8 after mixing; (2) adding polyacrylamide to the supernatant obtained in the step (1) according to the concentration ratio of 5-10ppm, stirring, and depositing; (3) carrying out aeration, filter pressing and drying on the lower deposits obtained in the step (1) to obtain iron oxide black, wherein filter liquor obtained through the filter pressing can be directly discharged. The method disclosed by the invention can be used for recovering insoluble titanium from the rutile titanium dioxide waste water as much as possible and reducing the discharge amount of the rutile titanium dioxide waste water, thereby recycling the water resources and further creating great economic benefit and environmental protection benefit to enterprises.

Description

technical field [0001] The invention relates to a clean production method for recycling titanium and water recycling, in particular to a method for treating rutile titanium dioxide wastewater, which belongs to the field of titanium dioxide production. Background technique [0002] The water used in the production process of titanium dioxide is usually mixed with drainage water and water purifier to remove suspended solids and colloidal impurities, and then the impurities are removed again through the filter material layer and then enters the sand filter tank to become sand filter water, which is obtained after being adsorbed by activated carbon. Desalinated water is used for titanium dioxide production. [0003] The production method of rutile titanium dioxide is the sulfuric acid method, which is the acidolysis reaction of ferrotitanium powder and concentrated sulfuric acid to generate intermediate titanyl sulfate, which needs to be hydrolyzed into metatitanic acid and sulf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C01G49/08C22B7/00C22B34/12
Inventor 沈亮姚恒平朱全芳杨万梅
Owner SICHUAN LOMON TITANIUM IND CO LTD