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Method for recycling titaniferous solution in titanium dioxide acidolysis sludge

A technology of titanium white acid and titanium white waste acid, applied in chemical instruments and methods, titanium dioxide, titanium compounds, etc., can solve the problems of reducing product profits, wasting valuable resources, and environmental hazards, so as to improve recovery rate and reduce harm degree, cost-saving effect

Pending 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

However, at present, the comprehensive utilization and recycling of black waste slag have not been well resolved, and it is basically discarded as waste, which not only wastes valuable resources and reduces the profit of the product, but also the accumulation of discharged waste slag will have a negative impact on environmental hazard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A method for recycling titanium liquid in acidolysis sludge of titanium dioxide, comprising the following steps:

[0032] S1 Unload the acidolysis sludge after the primary filter press into the beating tank, add waste titanium dioxide acid or process water to disperse the acidolysis sludge, and stir once to form a slurry. Among them, add 1m per ton of acid hydrolysis sludge 3 Titanium white waste acid containing 15% to 30% sulfuric acid; a stirring time of 30 minutes and a stirring speed of 60 r / min.

[0033] When the S2 slurry is unloaded, process water is added to make the soluble TiO 2 The concentration is 25g / L~45g / L, and it should be stirred for the second time after unloading. Wherein, the secondary stirring time is 20 min, and the secondary stirring speed is 60 r / min.

[0034] S3 The slurry after secondary stirring is pumped into the press for solid-liquid separation, and separated into filter cake and filtrate, and the filtrate is recovered titanium liquid. ...

Embodiment 2

[0037] A method for recycling titanium liquid in acidolysis sludge of titanium dioxide, comprising the following steps:

[0038] S1 Unload the acidolysis sludge after the primary filter press into the beating tank, add waste titanium dioxide acid or process water to disperse the acidolysis sludge, and stir once to form a slurry. Among them, add 1.5m 3 Titanium white waste acid containing 15% to 30% sulfuric acid; a stirring time of 35 minutes and a stirring speed of 45 r / min.

[0039] When the S2 slurry is unloaded, process water is added to make the soluble TiO 2 The concentration is 25g / L~45g / L, and it should be stirred for the second time after unloading. Wherein, the secondary stirring time is 10 min, and the secondary stirring speed is 50 r / min.

[0040] S3 The slurry after secondary stirring is pumped into the press for solid-liquid separation, and separated into filter cake and filtrate, and the filtrate is recovered titanium liquid.

[0041] S4 recovers titanium so...

Embodiment 3

[0043] A method for recycling titanium liquid in acidolysis sludge of titanium dioxide, comprising the following steps:

[0044] S1 Unload the acidolysis sludge after the primary filter press into the beating tank, add waste titanium dioxide acid or process water to disperse the acidolysis sludge, and stir once to form a slurry. Among them, add 2m per ton of acid hydrolysis sludge 3 Titanium white waste acid containing 15% to 30% sulfuric acid; a stirring time of 40 minutes and a stirring speed of 40 r / min.

[0045] When the S2 slurry is unloaded, process water is added to make the soluble TiO 2 The concentration is 25g / L~45g / L, and it should be stirred for the second time after unloading. Wherein, the secondary stirring time is 30 min, and the secondary stirring speed is 55 r / min.

[0046] S3 The slurry after secondary stirring is pumped into the press for solid-liquid separation, and separated into filter cake and filtrate, and the filtrate is recovered titanium liquid. ...

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PUM

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Abstract

The invention relates to the technical field of methods for recycling sludge in sulfuric acid method titanium dioxide production, and provides a method for recycling a titaniferous solution in titanium dioxide acidolysis sludge. The method comprises the following steps: S1, discharging acidolysis sludge subjected to primary filter pressing into a pulping tank, adding titanium dioxide waste acid orprocess water to disperse acidolysis sludge, and carrying out primary stirring to form slurry; S2, supplementing process water during discharging of the slurry to enable the concentration of solubleTiO2 to be 25-45g / L, and performing secondary stirring after discharging; S3, pumping the slurry obtained by the secondary stirring into a presser for solid-liquid separation to obtain filter cakes and filtrate, wherein the filtrate is recycled titaniferous solution; and S4, recycling a titaniferous solution which has a TiO2 concentration of 25-45g / L and stability of more than or equal to 150 in the titaniferous solution as small-degree water to be used as titanium ore or titanium slag leaching water in an acidolysis process. The method has the technical effects that: resources are fully utilized, the cost is saved, the recovery rate of the titanium dioxide production system can be effectively increased, and pollution of discharged waste to the environment is reduced.

Description

technical field [0001] The invention belongs to the technical field of the recovery method of sludge in sulfuric acid titanium dioxide production, and in particular relates to a method for recycling titanium liquid in titanium dioxide acidolysis sludge. Background technique [0002] my country's titanium dioxide production mainly adopts the sulfuric acid method. According to statistics, for every ton of titanium dioxide produced, 0.2t-0.3t of acidolysis waste residue must be discharged. Relevant analysis results show that the content of these black waste residues is generally about 25%, which has the value of further recycling. However, at present, the comprehensive utilization and recycling of black waste slag have not been well resolved, and it is basically discarded as waste, which not only wastes valuable resources and reduces the profit of the product, but also the accumulation of discharged waste slag will have a negative impact on The environment poses a hazard. [...

Claims

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Application Information

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IPC IPC(8): C01G23/053
CPCC01G23/0532Y02P10/20
Inventor 何彬李后明陈寿华蒋再春杨家权普燕尹红成宋科银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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