Analysis of causes of blockage of waste acid concentration heat exchanger in sulfuric acid process titanium dioxide

Wang Haibo; Wang Kui; Sun Ke; Ma Weiping

doi:10.7513/j.issn.1004-7638.2021.05.018

Volume 42 Issue 5

Oct. 2021

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Wang Haibo, Wang Kui, Sun Ke, Ma Weiping. Analysis of causes of blockage of waste acid concentration heat exchanger in sulfuric acid process titanium dioxide[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(5): 115-119, 125. doi: 10.7513/j.issn.1004-7638.2021.05.018

Citation:

Wang Haibo, Wang Kui, Sun Ke, Ma Weiping. Analysis of causes of blockage of waste acid concentration heat exchanger in sulfuric acid process titanium dioxide[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(5): 115-119, 125. doi: 10.7513/j.issn.1004-7638.2021.05.018

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Analysis of causes of blockage of waste acid concentration heat exchanger in sulfuric acid process titanium dioxide

doi: 10.7513/j.issn.1004-7638.2021.05.018

State Key Laboratory of Vanadium and Titanium Resources Corprehensive Utilization, Panzhihua 617000, Sichuan, China

Received Date: 2021-07-26
Publish Date: 2021-10-30

Abstract

Abstract

The blockage of the waste acid heat exchanger of sulfuric acid process titanium dioxide had been investigated through chemical composition analysis and XRD analysis, and caused by a mixture of calcium sulfate, ferrous sulfate monohydrate and meta-titanic acid. These mixture is derived from calcium sulfate, ferrous sulfate and titanyl sulfate in 20% waste acids. The influence of waste acid temperature and concentration on the concentration of calcium sulfate, ferrous sulfate and titanyl sulfate was studied in the laboratory. The results showed that when the waste acid temperature was 107 ℃ and the waste acid concentration increased from 18.41% to 49.93%, the concentration of calcium sulfate, ferrous sulfate and titanyl sulfate decreased from 1.26 g/L, 126.29 g/L and 10.76 g/L to 0.19 g/L, 13.23 g/L and 0.16 g/L, respectively. The concentration changing rule and data of calcium sulfate, ferrous sulfate and titanium oxysulfate in concentrated waste acid at all levels are basically consistent with those of laboratory research. The research results provide important data and theoretical support for the solution of heat exchanger blockage.
- sulfate process titanium dioxide,
- waste acid,
- concentration,
- heat exchanger,
- blockage

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References(15)

References

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