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Production method for full-resource cyclic utilization of sulfuric-acid-method titanium dioxide production wastewater

A technology for producing wastewater and production methods, applied in chemical instruments and methods, titanium compounds, titanium dioxide, etc., can solve the problems of difficulty in recycling economical utilization, production wastewater cannot be recycled and reused, etc. Utilize the effect of maximizing and saving a lot of needs

Pending Publication Date: 2021-03-16
CHENGDU QIANLIJIN TECHCAL INNOVATION CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0018] In order to solve the technical and economic difficulties that the existing sulfuric acid process titanium dioxide production wastewater cannot be recycled and reused, the carbon dioxide resources in the tail gas produced by the sulfuric acid process titanium dioxide are used to carry out mass flow and chemical energy flow with lime causticization solution and wastewater treatment equipment The coupled production technology overcomes the problems and deficiencies that the sulfuric acid process titanium dioxide wastewater is difficult to use in a circular economy after neutralization and treatment, eliminates the impact factors of the existing treated wastewater on the environmental water body, and saves a large amount of raw water resources used in production as the goal. ; The purpose of the present invention is to provide a production method for the recycling of all resources of the sulfuric acid process titanium dioxide production wastewater

Method used

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  • Production method for full-resource cyclic utilization of sulfuric-acid-method titanium dioxide production wastewater
  • Production method for full-resource cyclic utilization of sulfuric-acid-method titanium dioxide production wastewater
  • Production method for full-resource cyclic utilization of sulfuric-acid-method titanium dioxide production wastewater

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Embodiment 1

[0051] Such as figure 2 As shown, 1600L (specific gravity 1.05, containing 36.96g / L of sulfuric acid, 16.80g / L of ferrous sulfate, 0.525g / L of titanium sulfate, see Table 1) and hourly content of acid wastewater from sulfuric acid titanium dioxide production 29.0L of 170g / L calcium oxide milk of lime is neutralized in three series connected 2000L tanks with air distribution pipes at the bottom, and the air is blown into it for aeration and oxidation, and the residence time of the reaction materials is controlled for 1 hour , the pH value of the slurry is 7.5, and the slurry overflows from the top of the third-stage neutralization reaction tank and enters the filter press pump tank, and then is continuously sent to the filter press for pressure filtration separation, and 27.4 kg of filter cake with a water content of 45% is obtained per hour And 1685L treatment waste water (its composition of specific gravity 1.005 is shown in Table 2).

[0052] Table 1 Composition of titaniu...

Embodiment 2

[0063] Such as figure 2 As shown, the acid waste water from sulfuric acid titanium dioxide production is 240m3 per hour, the main composition is shown in Table 4, and 36.5m3 of milk of lime containing 200g / L calcium oxide per hour is placed in four series-connected 180m3 neutralization reaction tanks with stirring The neutralization reaction is carried out, and the bottom of the two-stage neutralization reaction tank is equipped with an air distribution pipe, and air is blown in for aeration and oxidation, and the residence time of the reaction material is controlled for 1.5 hours. The pH of the slurry is 7.5, and the slurry is obtained from the fourth stage. After overflowing from the top of the reaction tank and entering the filter press pump tank, it is continuously sent to the filter press for pressure filtration separation, and 45.5 tons of filter cake with a water content of 45% and 253 tons of treated waste water are obtained per hour. The composition is shown in Table ...

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Abstract

The invention discloses a production method for full-resource cyclic utilization of sulfuric-acid-method titanium dioxide production wastewater, which comprises the following steps of: neutralizing wastewater produced by sulfuric acid method titanium dioxide production by lime, separating gypsum by a filter press to obtain treated wastewater, and adding a recycled sodium carbonate solution to precipitate saturated calcium sulfate in the treated wastewater; clarifying the slurry to separate calcium carbonate precipitate and a sodium sulfate solution, and carrying out membrane separation on theseparated dilute sodium sulfate solution through a membrane filter; adding lime into a concentrated-phase sodium sulfate solution obtained after membrane separation for causticization reaction, takinga filtrate as a sodium hydroxide solution, employing carbon dioxide-containing tail gas generated in the titanium dioxide production process for carbonization, obtaining a sodium carbonate solution,and then returning the treated wastewater to precipitate saturated calcium sulfate. The method economically solves the technical problem that the lime neutralization treatment wastewater cannot be economically recycled in the sulfuric acid method titanium dioxide production process, eliminates the influence factors of outward discharge of the existing neutralization treatment wastewater on the environmental water body, and saves a large amount of raw water resources for production.

Description

technical field [0001] The invention relates to a production method for the treatment and recycling of production wastewater, in particular to a resource production method for the treatment and recycling of titanium dioxide production wastewater by a sulfuric acid process and the recycling of calcium sulfate-containing wastewater. Background technique [0002] The waste water produced by the sulfuric acid process titanium dioxide mainly comes from the metatitanic acid primary washing liquid, secondary washing filtrate and washing liquid in the production process, acid hydrolysis to produce gas washing acid waste water, calcination tail gas spray absorption water, sewage circulation drainage, floor flushing , equipment flushing, desalination station regeneration wastewater and sporadic wastewater. The main pollutant in the waste water is H 2 SO 4 、TiO 2 , Fe 2+ , Fe 3+ 、Na + and small and trace amounts of HSO 3 － , F - and Cl - and other harmful substances. The che...

Claims

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Application Information

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IPC IPC(8): C02F9/04C01G23/053
CPCC02F9/00C01G23/0532C02F1/66C02F1/5236C02F1/001C02F1/5245C02F1/441
Inventor 龚家竹
Owner CHENGDU QIANLIJIN TECHCAL INNOVATION CO LTD
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