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Detection method of hydrogen peroxide demand in the process of iron removal from concentrated waste acid

A detection method, the technology of hydrogen peroxide, is applied in the direction of chemical analysis by titration method, which can solve the problems of poor iron removal effect and waste of resources.

Active Publication Date: 2018-10-23
SICHUAN LOMON TITANIUM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] In order to avoid the waste of resources caused by adding excessive hydrogen peroxide in the process of removing iron from concentrated waste acid, or the poor effect of iron removal caused by not adding sufficient amount of hydrogen peroxide, and to realize the real-time regulation of the amount of hydrogen peroxide added in the process of removing iron from concentrated waste acid, the invention provides A method for detecting the demand of hydrogen peroxide in the process of concentrating waste acid to remove iron

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Measure 1000ml concentrated spent acid (H 2 SO 4 %=53.0%, Fe%=0.6%) in a 2000ml beaker; take 10mL hydrogen peroxide in the burette, ensure sufficient stirring conditions and add dropwise to the fresh hydrogen peroxide used in the production line (H 2 o 2 %=27%), the hydrogen peroxide should not touch the beaker wall during the dropping process, after the color of the waste acid solution turns light yellow, slow down the speed of adding hydrogen peroxide until the last drop of hydrogen peroxide turns the color of the solution into a bright orange red, stop adding immediately Hydrogen peroxide, add 5.0ml of hydrogen peroxide in total at this time, through calculation, the optimal amount of hydrogen peroxide for the concentrated waste acid iron removal is 5.0 ml / L, that is, the volume ratio is 0.5%.

Embodiment 2

[0034] Measure 1000ml concentrated spent acid (H 2 SO 4 %=53.0%, Fe%=1.0%) in a 2000ml beaker; take 10mL of hydrogen peroxide in the burette, ensure sufficient stirring conditions and add dropwise to the fresh hydrogen peroxide used in the production line (H 2 o 2%=27%), the hydrogen peroxide should not touch the wall of the beaker during the dropping process, after the color of the waste acid solution turns light yellow, slow down the speed of adding hydrogen peroxide until the last drop of hydrogen peroxide turns the color of the solution into bright orange red, stop adding hydrogen peroxide immediately At this time, a total of 8.2ml of hydrogen peroxide is added. By calculation, the optimal amount of hydrogen peroxide for the concentrated waste acid removal of iron is 8.2 ml / L, that is, the volume ratio is 0.82%.

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Abstract

The invention relates to a treatment method of a byproduct titanium dioxide waste acid in a sulfuric-acid-process production process of titanium dioxide powder and particularly discloses a detection method for a demanded quantity of hydrogen peroxide in an iron removing process of concentrated waste acid. The detection method comprises the following steps: A, putting a certain quantity of concentrated waste acid to be subjected to iron removal into a detection container and dropwise adding the hydrogen peroxide until the color of the concentrated waste acid to be subjected to iron removal in the detection container suddenly becomes orange, so as to determine a titration finishing point; and B, calculating the use amount ratio of the dropped hydrogen peroxide to the concentrated waste acid in the detection container, so as to obtain the adding quantity of the hydrogen peroxide in a production line by utilizing the ratio. The detection method provided by the invention has the advantages that (1) real-time regulation and control of the adding quantity of the hydrogen peroxide in the iron removing process of the concentrated waste acid is realized; and (2) a scheme of extracting phosphorite by recycling and utilizing the concentrated waste acid as monoammonium phosphate and feed-grade calcium hydrogen phosphate products in a production process is completed.

Description

technical field [0001] The invention relates to a sulfuric acid method titanium dioxide production process, in particular to a treatment method for the by-product titanium dioxide waste acid in the sulfuric acid method titanium dioxide production process. Background technique [0002] In the process of producing titanium dioxide by the sulfuric acid method, 8-10 tons of by-product waste acid with a mass concentration of about 20% will be produced for every 1 ton of titanium dioxide produced. The waste acid contains not only the main component H 2 SO 4 In addition, there are about 25% ferrous sulfate. If these waste acids are discharged directly without treatment, they will not only pollute the environment, but also cause serious waste of resources. How to deal with these by-product waste acids and economically and rationally recover the valuable parts has become an important technical problem in the production of titanium dioxide by sulfuric acid method, and it is also a ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N31/16
CPCG01N31/16
Inventor 代堂军姚恒平朱全芳孙润发文军唐刚陈翔
Owner SICHUAN LOMON TITANIUM IND CO LTD
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