Experimental study on the acidolysis reaction of low-grade titanium slag

Li Kaimao; Wang Haibo; Xiao Jun

doi:10.7513/j.issn.1004-7638.2022.01.003

Volume 43 Issue 1

Mar. 2022

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Li Kaimao, Wang Haibo, Xiao Jun. Experimental study on the acidolysis reaction of low-grade titanium slag[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(1): 13-18, 98. doi: 10.7513/j.issn.1004-7638.2022.01.003

Citation:

Li Kaimao, Wang Haibo, Xiao Jun. Experimental study on the acidolysis reaction of low-grade titanium slag[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(1): 13-18, 98. doi: 10.7513/j.issn.1004-7638.2022.01.003

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Experimental study on the acidolysis reaction of low-grade titanium slag

doi: 10.7513/j.issn.1004-7638.2022.01.003

State Key Laboratory for Comprehensive Utilization of Vanadium and Titanium Resources, Pangang Group Research Institute Co., Ltd., Panzhihua 617000, Sichuan, China

Received Date: 2021-10-22
Available Online: 2022-04-24
Publish Date: 2022-02-28

Abstract

Abstract

Regarding the problem that low acidolysis rate occurs frequently at the beginning of the experiment in low-grade titanium slag, an investigation was proposed to elaborate the relationship among the phase composition, acidolysis temperature curve, and standard heat of reaction for the chemical reaction in low-grade titanium slag and slag 74 (the titanium slag is 74%). Moreover, the effects of acid concentration, initiation temperature, primary reaction time, and acid-slag ratio on the acid hydrolysis rate of low-grade titanium slag were also investigated. The results show that the low acidolysis rate in low-grade titanium slag is not caused by the formation of the insoluble sulfuric acid phase but is related to the acidolysis reaction rate. One of the main reasons for the increasing acidolysis reaction rate and the decreasing primary reaction time in low-grade titanium is the increased initiation temperature. Appropriately reducing the initiation temperature can meet the demand of external heating to supplement heat for acidolysis in low-grade titanium slag. The acidolysis rate of slag 1^# increases from 78.98% to 94.31%, and that of slag 2^# increases from 71.77% to 91.19%, respectively, by reducing the concentration of reaction acid and the initiation temperature and prolonging the primary reaction time. In addition, compared with the phase of the residue obtained before optimization, the peak value about M₂TiO₅ is decreased, and a new phase (Ca(Mg,Fe,Al)(Si,Al)₂O₆) is formed in the phase of the residue.
- low-grade titanium slag,
- acidolysis reaction,
- initiation temperature,
- primary reaction time

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References(8)

References

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