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Treatment method of sulfuric acid method titanium dioxide acid wastewater

A technology for acid wastewater and treatment methods, which is applied in multi-stage water treatment, natural water treatment, neutralized water/sewage treatment, etc., and can solve the problem of the decline in the use efficiency of neutralization aeration tanks, restrictions on titanium dioxide production processes, and sewage treatment efficiency In order to achieve the effects of good aeration effect, efficiency improvement and cost control

Inactive Publication Date: 2021-03-05
攀枝花大互通钛业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The combination of calcium oxide and calcium hydroxide to neutralize wastewater has the following disadvantages: (1) the cost of treating wastewater with lime as raw material is high; (2) lime that has not been digested by digested water can only be treated as waste, resulting in a waste of resources (3) Stirring and aeration are carried out by blowing air, resulting in incomplete neutralization process and low sewage treatment efficiency; (4) solid phases are continuously deposited at the bottom of the neutralization aeration tank, which needs to be shut down for cleaning, resulting in The use efficiency of the neutralization aeration tank is reduced, which restricts the production process of titanium dioxide

Method used

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  • Treatment method of sulfuric acid method titanium dioxide acid wastewater

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Embodiment 1

[0035] A treatment method for sulfuric acid titanium dioxide acid waste water, comprising the following steps:

[0036] Under S1 stirring treatment, the mixed solution of acidic wastewater and clear water containing 3% to 8% sulfuric acid flows into the neutralization tank by gravity, and pumps limestone slurry for the first stage of neutralization. The pH of the reaction end point is 4.0 to 5.0. Among them, the ratio of acid wastewater to clean water is 1:25; the stirring speed is 40r / min.

[0037] S2 continues to stir, pumps in the digested lime slurry for the second stage of neutralization, and the pH at the end of the reaction is 7.0-8.5 to obtain a reaction slurry. Among them, the preparation method of lime slurry is as follows: after the lime is processed by a lime machine or a ball mill, it is mixed with digested water, and the water temperature is 30-40°C to obtain a lime slurry; the part of the lime that has not been digested by the digested water enters the ball mill...

Embodiment 2

[0041] A treatment method for sulfuric acid titanium dioxide acid waste water, comprising the following steps:

[0042] Under S1 stirring treatment, the mixed solution of acidic wastewater and clear water containing 3% to 8% sulfuric acid flows into the neutralization tank by gravity, and pumps limestone slurry for the first stage of neutralization. The pH of the reaction end point is 4.0 to 5.0. Among them, the ratio of acid wastewater to clean water is 1:40; the stirring speed is 45r / min.

[0043] S2 continues to stir, pumps in the digested lime slurry for the second stage of neutralization, and the pH at the end of the reaction is 7.0-8.5 to obtain a reaction slurry. Among them, the preparation method of lime slurry is as follows: after the lime is processed by a lime machine or a ball mill, it is mixed with digested water, and the water temperature is 30-40°C to obtain a lime slurry; the part of the lime that has not been digested by the digested water enters the ball mill...

Embodiment 3

[0047] A treatment method for sulfuric acid titanium dioxide acid waste water, comprising the following steps:

[0048] Under S1 stirring treatment, the mixed solution of acidic wastewater and clear water containing 3% to 8% sulfuric acid flows into the neutralization tank by gravity, and pumps limestone slurry for the first stage of neutralization. The pH of the reaction end point is 4.0 to 5.0. Among them, the ratio of acid wastewater to clean water is 1:35; the stirring speed is 60r / min.

[0049]S2 continues to stir, pumps in the digested lime slurry for the second stage of neutralization, and the pH at the end of the reaction is 7.0-8.5 to obtain a reaction slurry. Among them, the preparation method of lime slurry is as follows: after the lime is processed by a lime machine or a ball mill, it is mixed with digested water, and the water temperature is 30-40°C to obtain a lime slurry; the part of the lime that has not been digested by the digested water enters the ball mill ...

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Abstract

The invention relates to the technical field of titanium dioxide acidic wastewater treatment, and provides a treatment method of sulfuric acid method titanium dioxide acid wastewater. The method comprises the following steps that: S1, under stirring treatment, a mixed solution of acidic wastewater and clear white water containing 3-8% of sulfuric acid automatically flows into a neutralization poolthrough height difference, limestone slurry is pumped into the neutralization pool, and first-stage neutralization is carried out, the pH value ranges from 4.0 to 5.0 at the reaction end point ; S2,stirring is continued, the digested lime slurry is pumped, and second-stage neutralization is carried out until the pH value is 7.0-8.5 at the reaction end point to obtain reaction slurry; S3, the qualified reaction slurry obtained after the neutralization is pumped into a filter press for filter pressing, the pH value of the reaction slurry is 6.5-8.5; and S4, a filter cake obtained after filterpressing is naturally dried, filtrate obtained after filter pressing is aerated and filtered, qualified water which is detected to reach the standard is discharged or is used as process water. The method of the invention has the advantages of high neutralization efficiency, good aeration effect and low cost.

Description

technical field [0001] The invention belongs to the technical field of titanium dioxide acid wastewater treatment, and in particular relates to a treatment method for titanium dioxide acid wastewater. Background technique [0002] The production of sulfuric acid titanium dioxide will produce a large amount of acidic wastewater. The conventional treatment method is to neutralize it through the combination of calcium oxide and calcium hydroxide, and then obtain the qualified wastewater and gypsum through aeration, pressure filtration and other processes. [0003] The combination of calcium oxide and calcium hydroxide to neutralize wastewater has the following disadvantages: (1) the cost of treating wastewater with lime as raw material is high; (2) lime that has not been digested by digested water can only be treated as waste, resulting in a waste of resources (3) Stirring and aeration are carried out by blowing air, resulting in incomplete neutralization process and low sewage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C01F11/46C02F103/34
CPCC02F9/00C01F11/46C02F2103/34C02F1/66C02F1/001C02F7/00C02F2301/08
Inventor 陈寿华李后明蒋再春杨家权普燕尹红成宋科银何彬罗春丽伍春波罗小军袁晓艳周兵罗宏
Owner 攀枝花大互通钛业有限公司
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