Process for recovering waste acid in producing titanium white powder by sulfuric acid method

A recovery method and technology of titanium dioxide, applied in the directions of sulfur trioxide/sulfuric acid, titanium dioxide, titanium oxide/hydroxide, etc., can solve the blockage of nozzle parts, the inability to effectively separate salt and acid, and it is difficult to meet the requirements of concentrated acid impurity content And other issues

Inactive Publication Date: 2002-11-27
吉林市吉研高新技术开发公司 +1
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

If these impurities are not removed, it will be difficult to meet the requirements for impurity content when the concentrated acid is reused
What's more serious is that if the device is simply used to concentrate waste acid, a large amount of inorganic salts will be produced during the concentration process. After that, the nozzle, multi-leaf ball or Baoer ring, separation guide plate group and separation net in the device will all be blocked, and the concentration device cannot continue to operate.
At the same time, if the content of solid titanium in the waste acid is not controlled, a large amount of colloidal hydrolyzate will be produced during the concentration process, resulting in the inability to effectively separate the salt and the acid. In fact, the concentrated acid cannot be obtained, let alone returned. use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1 ton of waste acid (analysis and determination: sulfuric acid 20.70%, iron: 41.2g / l, calcium: 3.20g / l, magnesium: 6.51g / l, solid titanium: 1.42g / l) in the production of sulfuric acid titanium dioxide is as follows operate:

[0025] Precipitation pretreatment: The above waste acid enters the inclined plate sedimentation tank for pre-sedimentation treatment. The solid titanium is collected and recovered at the bottom of the sedimentation tank through sedimentation, and the waste acid obtained from the upper part of the sedimentation tank enters the storage tank. The solid titanium content in the spent acid after precipitation pretreatment was determined to be 0.50 g / l.

[0026] Pre-concentration: The waste acid in the storage tank is pumped into the heat exchanger and heated to 55-60 ° C, then enters the injector through the liquid inlet pipe, and the spray nozzle creates fog, and the fog droplets with heavy specific gravity fall into the solution vaporizer. In the mult...

Embodiment 2

[0031] 1 ton of waste acid in the production of sulfuric acid titanium dioxide (analysis and determination: sulfuric acid 19.80%, iron: 38.19g / l, calcium: 5.40g / l, magnesium: 7.17g / l, solid titanium: 1.94g / l) enters the vertical Pretreatment is carried out in the flow sedimentation tank. After the precipitation pretreatment, the solid titanium content in the waste acid is determined to be 0.50g / l by analysis.

[0032] The steps of pre-concentration, filtration and concentration are the same as in Example 1. But its process conditions are as follows:

[0033] The pre-concentration temperature is controlled at 50-55°C, and the pre-concentration is stopped when the measured waste acid concentration is 48.2%; the concentration temperature is controlled at 70-75°C, and the concentration is stopped when the measured acid concentration is 69.7%.

[0034] Product result: the content of inorganic salt in the concentrated acid of the product is determined to be 2.72% (2.24% of ferrous ...

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Abstract

A process for recovering the waste acid in producing titanium oxide powder by the sulfuric acid method features use of gas-liquid separation type non-volatile solution concentrating apparatus. It includes such steps as depositing the waste acid to receiver solid Ti, pre-concentrating at 50-60 deg.C until acid concentration is 40-50%, filtering, and concentrating at 65-75 deg.C until its concentration reaches more than 70%.

Description

technical field [0001] The invention relates to a method for recovering waste acid in the production of sulfuric acid titanium dioxide. Background technique [0002] At present, there are sulfuric acid method and chlorination method for producing titanium dioxide. The sulfuric acid method has the advantages of sufficient source of raw materials and low production cost. However, a large amount of waste sulfuric acid is produced in the production process. If it is discharged directly without treatment, it will pollute the environment. If the processing method is not selected properly, the production cost will be greatly increased. [0003] A common treatment method for waste sulfuric acid is to discharge it after neutralization with lime. This method not only wastes resources, produces a large amount of waste residue, costs huge treatment costs, but also causes secondary pollution. Another method is to use waste dilute sulfuric acid to concentrate an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/90C01G23/053
Inventor 王俊杰吕继萍蔡晓光
Owner 吉林市吉研高新技术开发公司
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