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Titanium dioxide wastewater treatment method favorable for improving utilization ratio of calcium oxide and dehydration property of byproduct gypsum

A technology of by-product gypsum and dehydration performance, which is applied in the field of titanium dioxide acid wastewater treatment, can solve the problems of poor dehydration performance of by-product gypsum and low utilization rate of calcium oxide, and achieve the effect of improving utilization rate

Active Publication Date: 2017-02-08
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems of low calcium oxide utilization rate and poor dehydration performance of by-product gypsum in the treatment process of titanium white acidic wastewater, the purpose of the present invention is to improve and innovate the traditional wastewater treatment process, so that these problems can be significantly improved, and a A titanium dioxide wastewater treatment method that is beneficial to improve the utilization rate of calcium oxide and the dehydration performance of by-product gypsum

Method used

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  • Titanium dioxide wastewater treatment method favorable for improving utilization ratio of calcium oxide and dehydration property of byproduct gypsum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Take 400mL of deionized water, heat it to 35°C, and add 80% calcium oxide to the reaction vessel under the condition of stirring intensity of 300r / min to prepare the digested product calcium hydroxide, and dilute it to a concentration of 2wt% hydrogen calcium oxide solution.

[0034] Take 500mL of titanium dioxide acidic wastewater, heat it to 45°C, and add calcium carbonate to the acidic wastewater under the condition of stirring intensity of 400r / min, adjust the pH to 4.5; 30min; then add the diluted calcium hydroxide solution into the acidic wastewater at a flow rate of 5mL / min for the second stage of neutralization, and adjust the pH value to 9. After the neutralization is completed, add 0.1mL cationic polyacrylamide solution (CPAM) with a concentration of 1wt%, and then continue to stir for 30 minutes; after stopping the stirring, let it stand for 20 minutes; Press the by-product gypsum into a filter cake, measure the water content of the filter cake, and compare ...

Embodiment 2

[0038] Take 400mL of deionized water, heat it to 35°C, and add 80% calcium oxide to the reaction vessel under the condition of stirring intensity of 300r / min to prepare the digested product calcium hydroxide, and dilute it to a concentration of 2wt% hydrogen calcium oxide solution.

[0039] Take 500mL of titanium dioxide acidic wastewater, heat it to 45°C, and add calcium carbonate to the acidic wastewater under the condition of stirring intensity of 400r / min, adjust the pH to 4.5; 30min; then add the diluted calcium hydroxide solution into the acidic wastewater at a flow rate of 5mL / min for the second stage of neutralization, and adjust the pH value to 9. After the neutralization is completed, add 0.1mL cationic polyacrylamide solution (CPAM) with a concentration of 1wt%, and then continue to stir for 30 minutes; after stopping the stirring, let it stand for 20 minutes; Press the by-product gypsum into a filter cake, measure the water content of the filter cake, and compare ...

Embodiment 3

[0043] Take 400mL of deionized water, heat it to 35°C, and add 80% calcium oxide to the reaction vessel under the condition of stirring intensity of 300r / min to prepare the digested product calcium hydroxide, and dilute it to a concentration of 2wt% hydrogen calcium oxide solution.

[0044]Take 500mL of titanium dioxide acidic wastewater, heat it to 45°C, and add calcium carbonate to the acidic wastewater under the condition of stirring intensity of 400r / min, adjust the pH to 4.5; 30min; then add the diluted calcium hydroxide solution into the acidic wastewater at a flow rate of 5mL / min for the second stage of neutralization, and adjust the pH value to 9. After the neutralization is completed, add 0.1mL cationic polyacrylamide solution (CPAM) with a concentration of 1wt%, and then continue to stir for 30 minutes; after stopping the stirring, let it stand for 20 minutes; Press the by-product gypsum into a filter cake, measure the water content of the filter cake, and compare t...

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Abstract

The invention discloses a titanium dioxide wastewater treatment method favorable for improving the utilization ratio of calcium oxide and the dehydration property of a byproduct gypsum. The method comprises the steps of firstly utilizing calcium carbonate and calcium oxide to neutralize acid wastewater through a two-stage neutralization method, then partially reusing the generated byproduct gypsum to a next acid wastewater treatment process according to a seed crystal circulation principle, and circulating repeatedly. The reused byproduct gypsum can serve as seed crystal to improve the crystal growth of newly-generated gypsum, and the dehydration property of the byproduct gypsum is improved; in a circulation process, unreacted calcium oxide mixed in the byproduct gypsum can be released again and participates into neutralization reaction; thus, the utilization rate of the calcium oxide is improved.

Description

technical field [0001] The invention relates to the field of treatment of titanium white acidic wastewater, in particular to a treatment method for titanium white wastewater which is beneficial to improving the utilization rate of calcium oxide and the dehydration performance of by-product gypsum. [0002] technical background [0003] As a main method of producing titanium dioxide, the sulfuric acid method has the advantages of mature technology, simple operation, and wide source of raw materials, but this method contains about 1 wt%-2wt%H per 1t of titanium dioxide produced on average, more than 100t 2 SO 4 , 0.1wt% -0.2wt%MgSO 4 , 0.1wt%-0.2wt%MnSO 4 , 0.1wt%-0.2wt% Al 2 (SO4) 3 , 0.6wt%-1wt% FeSO 4 of acidic wastewater. Titanium dioxide acid wastewater treatment is a major problem to be solved urgently in the titanium dioxide industry. [0004] The general treatment method of titanium dioxide acid wastewater is calcium oxide neutralization method, the process is to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C01F11/46
Inventor 赵丽红徐慧何北海
Owner SOUTH CHINA UNIV OF TECH
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