Chemical dehydration coupling multi-effect evaporation to treat waste sulfuric acid in titanium dioxide production process

doi:10.1016/j.cjche.2020.02.009

中国化学工程学报 ›› 2020, Vol. 28 ›› Issue (4): 1162-1170.DOI: 10.1016/j.cjche.2020.02.009

• Energy, Resources and Environmental Technology • 上一篇下一篇

Chemical dehydration coupling multi-effect evaporation to treat waste sulfuric acid in titanium dioxide production process

Hongyin Pang^1,2, Ruifang Lu¹, Tao Zhang², Li Lü², Yanxiao Chen², Shengwei Tang²

1 State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua 617000, China;
2 School of Chemical Engineering, Sichuan University, Chengdu 610065, China

收稿日期:2019-10-29 修回日期:2020-02-04 出版日期:2020-04-28 发布日期:2020-07-27
通讯作者: Shengwei Tang
基金资助:
The authors gratefully acknowledge the State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization of China for its financial support. The authors are also grateful for the financial support of National Natural Science Foundation of China (Grant No. 21576168) & Science and Technology Cooperation Fund of Sichuan University-Panzhihua (No: 2018CDPZH-23-SCU).

Chemical dehydration coupling multi-effect evaporation to treat waste sulfuric acid in titanium dioxide production process

Hongyin Pang^1,2, Ruifang Lu¹, Tao Zhang², Li Lü², Yanxiao Chen², Shengwei Tang²

1 State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua 617000, China;
2 School of Chemical Engineering, Sichuan University, Chengdu 610065, China

Received:2019-10-29 Revised:2020-02-04 Online:2020-04-28 Published:2020-07-27
Contact: Shengwei Tang
Supported by:
The authors gratefully acknowledge the State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization of China for its financial support. The authors are also grateful for the financial support of National Natural Science Foundation of China (Grant No. 21576168) & Science and Technology Cooperation Fund of Sichuan University-Panzhihua (No: 2018CDPZH-23-SCU).

摘要/Abstract

摘要： In order to concentrate the diluted sulfuric acid from the titanium dioxide (TiO₂) production of sulphate process, a new concentration process was proposed by coupling chemical dehydration and multi-effect evaporation. The ferrous sulfate monohydrate (FeSO₄·H₂O), as the dehydrant, was added to the diluted sulfuric acid to form ferrous sulfate heptahydrate (FeSO₄·7H₂O) according to the H₂SO₄-FeSO₄-H₂O phase diagrams, which partially removes the water. This process was named as Chemical Dehydration Process. The residual water was further removed by two-effect evaporation and finally 70 wt% sulfuric acid was obtained. The FeSO₄·H₂O can be regenerated through drying and dehydration of FeSO₄·7H₂O. The results show that FeSO₄·H₂O is the most suitable dehydrant, the optimal reaction time of chemical dehydration process is 30 min, and low temperature is favorable for the dehydration reaction. 45.17% of the entire removed water can be removed by chemical dehydration from the diluted sulfuric acid. This chemical dehydration process is also energy efficient with 24.76% saving compared with the direct evaporation process. Furthermore, 51.21% of the FeSO₄ dissolved originally in the diluted sulfuric acid are precipitated out during the chemical dehydration, which greatly reduces the solid precipitation and effectively alleviates the scaling in the subsequent multi-effect evaporation process.

关键词: Chemical dehydration, Multi-effect evaporation, Sulfuric acid, Titanium

Abstract: In order to concentrate the diluted sulfuric acid from the titanium dioxide (TiO₂) production of sulphate process, a new concentration process was proposed by coupling chemical dehydration and multi-effect evaporation. The ferrous sulfate monohydrate (FeSO₄·H₂O), as the dehydrant, was added to the diluted sulfuric acid to form ferrous sulfate heptahydrate (FeSO₄·7H₂O) according to the H₂SO₄-FeSO₄-H₂O phase diagrams, which partially removes the water. This process was named as Chemical Dehydration Process. The residual water was further removed by two-effect evaporation and finally 70 wt% sulfuric acid was obtained. The FeSO₄·H₂O can be regenerated through drying and dehydration of FeSO₄·7H₂O. The results show that FeSO₄·H₂O is the most suitable dehydrant, the optimal reaction time of chemical dehydration process is 30 min, and low temperature is favorable for the dehydration reaction. 45.17% of the entire removed water can be removed by chemical dehydration from the diluted sulfuric acid. This chemical dehydration process is also energy efficient with 24.76% saving compared with the direct evaporation process. Furthermore, 51.21% of the FeSO₄ dissolved originally in the diluted sulfuric acid are precipitated out during the chemical dehydration, which greatly reduces the solid precipitation and effectively alleviates the scaling in the subsequent multi-effect evaporation process.

Key words: Chemical dehydration, Multi-effect evaporation, Sulfuric acid, Titanium

Hongyin Pang, Ruifang Lu, Tao Zhang, Li Lü, Yanxiao Chen, Shengwei Tang. Chemical dehydration coupling multi-effect evaporation to treat waste sulfuric acid in titanium dioxide production process[J]. 中国化学工程学报, 2020, 28(4): 1162-1170.

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Chemical dehydration coupling multi-effect evaporation to treat waste sulfuric acid in titanium dioxide production process

Chemical dehydration coupling multi-effect evaporation to treat waste sulfuric acid in titanium dioxide production process

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