钛精矿酸解尾气中升华硫产生的机理分析

向泉锦; 全远霞; 全学军; 李礼; 王海波; 陈新红; 李平

doi:10.7513/j.issn.1004-7638.2023.03.015

钛精矿酸解尾气中升华硫产生的机理分析

doi: 10.7513/j.issn.1004-7638.2023.03.015

向泉锦^{1, 2,},
全远霞²,
全学军^2, ,,
李礼²,
王海波¹,
陈新红³,
李平²

1.
钒钛资源综合利用国家重点实验室, 四川攀枝花 617000
2.
重庆理工大学化学化工学院, 重庆 400054
3.
攀钢集团重庆钛业有限公司, 重庆 400054

基金项目: 钒钛资源综合利用国家重点实验室开放基金课题（2022P4FZG10A）。

详细信息

作者简介:
向泉锦，1999年出生，女，四川阆中人，硕士研究生，研究方向为资源环境化工，E-mail：QJXiang@stu.cqut.edu.cn

通讯作者:
全学军，教授，博士生导师，研究方向为资源环境化工，E-mail：hengjunq@cqut.edu.cn

中图分类号: TF823,X701
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出版历程
- 收稿日期: 2023-01-31
- 刊出日期: 2023-06-30

Mechanism analysis of the production of sublimated sulfur in the tail gas of acidolysis of titanium concentrate

1.
State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua 617000, Sichuan, China
2.
School of Chemistry and Chemical Engineering , Chongqing University of Technology, Chongqing 400054, China
3.
Panzhihua Steel Group Chongqing Titanium Industry Co., Ltd., Chongqing 400054, China

摘要

摘要: 针对硫酸法钛白酸解过程中升华硫堵塞管道从而影响钛白粉连续生产的问题，从钛精矿的结构组成分析出发，结合其在酸解过程可能存在的主要化学反应和实际生产中具体的酸解工艺条件，通过计算相关反应的吉布斯自由能变化，绘制酸解反应条件下体系的电位-pH图，探究了酸解尾气中升华硫产生的机理。结果表明，酸解尾气中单质硫应该主要来源于钛精矿中的磁黄铁矿（FeS），磁黄铁矿在酸解的高温（180～220 ℃）、高酸度（pH：−1.51～−1.47）复杂环境下被氧化生成单质硫，待反应结束后冷却凝固形成升华硫。因此在生产中可以从具体工艺入手，在不降低酸解率的情况下改变酸解环境（改变化学电位、降低环境pH值），以此规避或减小升华硫的产生，降低升华硫对硫酸法钛白的影响。
- 钛精矿 /
- 酸解 /
- 尾气 /
- 升华硫 /
- 产生机理
Abstract: In order to prevent the continuous production of titanium dioxide from being blocked by sublimated sulfur in the process of titanium dioxide acidolysis by sulflate process, this paper starts from the structural composition analysis of titanium concentrate, combined with the main chemical reactions that may exist in the acidolysis process and the specific acidolysis process conditions in actual production by calculating the change of Gibbs free energy of related reactions. The potentio-pH diagram of the system under the condition of acid hydrolysis was drawn, and the mechanism of the occurrence of sublimated sulfur in the tail gas of acid hydrolysis was explored. The results show that the elemental sulfur in the tail gas of acidolysis mainly come from the pyrrhotite (FeS) in titanium concentrate. The pyrrhotite is oxidized in the complex environment of acid hydrolysis at high temperature (180～220 ℃) and high acidity (pH: −1.51～−1.47) to produce elemental sulfur, which is cooled and solidified to form sublimated sulfur after the reaction. Therefore we can start from the specific process, change the acid hydrolysis environment (change the chemical potential, reduce the environmental pH value) without reducing the acid hydrolysis rate in order to avoid or reduce the occurrence of sublimation sulfur in production, reduce the effect of sublimation sulfur on the sulfate process titanium white.
- titanium concentrate /
- acid hydrolysis /
- tail gas /
- sublimation sulfur /
- mechanism analysis

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图 1 钛精矿的XRD分析结果

Figure 1. XRD analysis results of titanium concentrate

下载: 全尺寸图片幻灯片

图 2 钛精矿的SEM图像

Figure 2. SEM image of titanium concentrate

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图 3 S-Fe-Ti-H₂O体系中不同温度下S元素存在状态的E-pH关系

Figure 3. E-pH diagram of the presence of S element at 180 ℃ (a), 200 ℃ (b), and 220 ℃ (c) in S-Fe-Ti-H₂O system

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图 4 钛精矿酸解过程中主反应吉布斯自由能的变化

Figure 4. Change of Gibbs free energy of the main reaction during acid hydrolysis of titanium concentrate

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表 1 钛精矿的主要化学成分

Table 1. Main chemical components of titanium concentrate %

TiO₂	TFe	SiO₂	MgO	Al₂O₃	CaO	V₂O₅	S	MnO
46.14	19.65	0.79	1.277	0.06	0.84	0.08	0.14	0.26

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表 2 钛精矿的矿物组成

Table 2. Mineral composition of titanium concentrate %

钛铁矿	绿泥石	钛闪石	透辉石	榍石	磁铁矿	钛铁矿+绿泥石	钛铁矿+石灰	微斜长石	黄铁矿	磁黄铁矿
90.53	2.44	1.77	0.94	0.65	0.58	0.54	0.53	0.39	0.12	0.06

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表 3 钛精矿中的元素赋存情况

Table 3. Occurrence of elements in titanium concentrate %

矿物	Al	Ca	Fe	Mg	Mn	S	Si	Ti	V
钛铁矿	12.22	11.42	94.94	82.98	79.47	0.00	29.14	97.45	97.48
磁铁矿	3.02	0.00	1.05	0.48	0.00	0.00	0.00	0.14	0.61
钛闪石	16.41	24.18	0.51	2.20	7.18	0.00	14.29	0.56	0.70
绿泥石	37.30	1.42	1.44	6.78	0.00	0.00	19.30	0.15	0.02
榍石	2.27	18.12	0.07	0.02	0.00	0.00	5.39	0.46	0.06
钛铁矿+石灰	0.52	10.21	0.40	0.69	0.00	0.00	0.36	0.47	0.41
微斜长石	9.76	4.11	0.01	0.00	0.00	0.00	5.06	0.00	0.00
钛铁矿+绿泥石	3.06	7.04	0.34	0.00	8.74	0.00	3.44	0.50	0.35
磁黄铁矿	0.00	0.00	0.11	0.00	0.00	24.86	0.00	0.00	0.00
黄铁矿	0.00	0.00	0.17	0.00	0.00	69.52	0.00	0.01	0.00

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