Method for treating acid wastewater of titanium white

A technology of acid wastewater and titanium dioxide, applied in the direction of neutralization water/sewage treatment, etc., can solve the problems of low lime utilization rate, large consumption, high production cost, etc., and achieve the goal of improving lime utilization rate, reducing treatment cost and broadening supply channels Effect

Active Publication Date: 2007-10-10
ANHUI ANNADA TITANIUM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technological process is mature and reliable, and domestic and foreign sulfuric acid titanium dioxide production enterprises basically use this method to treat acid wastewater, but there are disadvantages of low utilization rate of raw lime, large consumption, and high production cost; at the same time, lime digested residue is produced, causing secondary pollution
Especially in areas where high-quality quicklime is in short supply, the shortcomings of this process are more obvious and prominent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Eliminate the residual lime slag (the main component is CaCO 3 , also contains some lime and Ca(OH) 2 ), with ball mill wet grinding to 90% over 100 mesh slurry. The total CaO content in the slurry is 21.0%, and the effective CaO content is 9.6%. Take 500.0 grams of titanium dioxide acidic wastewater, add 24.0 grams of the above slurry, and stir mechanically for 5 to 10 minutes. The pH value of the acidic wastewater rises from less than 0.5 to 4.0. Filter to obtain 33.7 grams of water-containing 21.36% white gypsum. The filtrate is then neutralized with milk of lime, the total content of CaO in the milk of lime is 27.6%, and the effective content of CaO is 26.9%. Add 7.0 grams of milk of lime, mechanically stir and aerate for 20 to 40 minutes, and neutralize the filtrate to a pH value of 7.2. Filter to obtain 33.2 grams of red gypsum with a water content of 66.34%.

Embodiment 2

[0013] Eliminate the residual lime slag (the main component is CaCO 3 , also contains some lime and Ca(OH) 2 ), with ball mill wet grinding to 90% over 60 mesh slurry, the total CaO content of the slurry is 21.0%, and the effective CaO content is 9.6%. Take 500.0 grams of titanium dioxide acidic wastewater, add 24.3 grams of the above slurry, and mechanically stir for 5 to 10 minutes. The pH value of the acidic wastewater rises from less than 0.5 to 2.0. Without filtering, directly continue neutralization with milk of lime, the total CaO content of the milk of lime is 27.6%, and the effective content of CaO is 26.9%. Add 7.4 grams of milk of lime, mechanically stir and aerate for 20 to 40 minutes, and neutralize the filtrate to a pH value of 7.3. Filter to obtain 69.4 grams of red gypsum with a water content of 56.34%.

Embodiment 3

[0015] Get 500.0 grams of titanium dioxide acidic waste water, add calcite powder (main component CaCO 3 Content 99%, 90% passing through 80 mesh) 9.66 grams, mechanically stirred for 5-10 minutes, the pH value of this acid waste water rises from less than 0.5 to 3.0. Filter to obtain 24.5 grams of water-containing 23.36% white gypsum. The filtrate is then neutralized with lime milk, the total CaO content of the lime milk is 27.6%, and the effective CaO content is 26.9%. Add 7.0 grams of milk of lime, mechanically stir and aerate for 20 to 40 minutes, and neutralize the filtrate to a pH value of 7.2. Filter to obtain 43.4 grams of red gypsum with a water content of 63.54%.

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Abstract

This invention discloses a method for treating acidic wastewater produced during titanium dioxide production by H2SO4 method by using quicklime. The method comprises: wet-grinding quicklime digestion dreg into 60 mesh slurry (90%), and pre-neutralizing the acidic wastewater of titanium dioxide with the slurry. The method has such advantages as high quicklime utility, and no secondary pollution.

Description

technical field [0001] The invention relates to a method for treating acidic wastewater, in particular to a method for treating acidic wastewater in sulfuric acid titanium dioxide production with quicklime raw material. Background technique [0002] The production process of titanium dioxide by sulfuric acid method is characterized by large discharge of waste residue, waste water and waste gas, and serious pollution. For acid waste water alone, there are 100-150 tons of titanium dioxide produced per ton. Since the acid waste water contains harmful impurities such as a large amount of free sulfuric acid (1.0-3.0% by weight) and iron (0.1-0.5% by weight), it must be treated up to the standard before it can be discharged. [0003] The traditional titanium dioxide acid wastewater treatment process is to first digest quicklime into milk of lime, then neutralize with acid wastewater to neutrality, and then fully aerate and oxidize, then precipitate and filter to separate gypsum s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/66
Inventor 杨文斌叶丽君鲁军
Owner ANHUI ANNADA TITANIUM IND CO LTD
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