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Method for removing metal ions from titanium white waste acid with chelating agent

A technology of titanium dioxide waste acid and metal ions, applied in the direction of sulfur trioxide/sulfuric acid, etc., to achieve the effect of simple equipment, few steps and high removal rate

Inactive Publication Date: 2011-01-19
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for removing metal ions in titanium dioxide waste acid with a chelating agent for the shortcomings of the existing method for removing metal salts in titanium dioxide waste acid, which has the advantages of simple equipment, small investment, and high processing capacity. Large, low cost, simple and easy to implement, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The specific steps of a method for removing metal ions in titanium dioxide waste acid with a chelating agent are as follows:

[0023] (1) Chelation reaction

[0024] Add hydroxyethylidene diphosphonic acid (HEDP) chelating agent solution to the waste acid produced from titanium dioxide, stir and mix evenly, and then prepare the mixture of titanium white waste acid and chelating agent solution. The volume (ml) of its chelating agent solution: the weight (g) ratio of titanium dioxide waste acid is 1: 286. Then, the mixture was put into a water bath, and the chelation reaction was carried out at 85° C. for 45 minutes to prepare a flocculent suspension, and the heating was stopped, and cooled to room temperature with a water bath.

[0025] (2) suction filtration

[0026] After step (1) is completed, place the flocculent suspension prepared in step (1) in a suction filter, perform suction filtration until no filtrate drips out, and collect the filtrate and filter residue. ...

Embodiment 2

[0028] A kind of concrete steps of the method for removing metal ion in titanium white waste acid with chelating agent, with embodiment 1, wherein:

[0029] In the (1) step, the chelating agent solution that adds is hydroxyethylidene diphosphonic acid (HEDP) solution, the volume (ml) of hydroxyethylidene diphosphonic acid (HEDP) chelating agent solution: the weight (g) of titanium dioxide waste acid ) ratio is 1:630.

Embodiment 3

[0031] A kind of concrete steps of the method for removing metal ion in titanium white waste acid with chelating agent, with embodiment 1, wherein:

[0032] In the (1) step, the chelating agent solution that adds is hydroxyethylidene diphosphonic acid (HEDP) solution, the volume (ml) of hydroxyethylidene diphosphonic acid (HEDP) chelating agent solution: the weight (g) of titanium dioxide waste acid ) ratio is 1:210.

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Abstract

The invention relates to a method for removing metal ions from titanium white waste acid with chelating agent, in particular to a dealing method for waste acid when producing titanium white. The method of the invention manufactures the products via simple procedures of chelating reaction and filtration. The invention has the advantages of simple method, simple device, large dealing capacity, highremoval rate of metal irons, low cost and the like and is convenient to popularize and apply. The invention can be widely applied in removing metal ions from industrially producing waste acid, and isespecially suitable for removing metal ions from titanium white waste acid.

Description

technical field [0001] The invention belongs to the technical field of industrial waste acid treatment, and in particular relates to a treatment method for waste acid in titanium dioxide production. Background technique [0002] Titanium dioxide is one of the important chemical raw materials. my country is rich in titanium resources, but the titanium dioxide industry started late, the production scale is small, and most of them are produced by sulfuric acid method. discharge 8 to 10 tons of waste acid). With the strengthening of ecological protection, the government has become more and more strict on environmental governance, and the comprehensive treatment of waste acid produced in titanium dioxide production has become more and more urgent. [0003] The production of titanium dioxide by the sulfuric acid method produces a large amount of waste sulfuric acid (referred to as titanium dioxide waste acid). When the concentration process is used to recover titanium dioxide wast...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/90
Inventor 董立春李文平罗自萍张建华汪刚魏顺安谭世语黄少建吴纪周
Owner CHONGQING UNIV
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