盐酸法浸出水淬含钛高炉渣制备高纯金红石型二氧化钛

黄先良; 钟山; 唐思扬; 宋磊; 李红娇; 梁斌

doi:10.7513/j.issn.1004-7638.2023.03.004

盐酸法浸出水淬含钛高炉渣制备高纯金红石型二氧化钛

doi: 10.7513/j.issn.1004-7638.2023.03.004

四川大学化学工程学院, 四川成都 610065

基金项目: 四川省科技计划重点研发项目（No.2022YFS0448）；国家自然科学基金资助项目（NSFC，No.21908150）

详细信息

作者简介:
黄先良，1996年出生，男，四川内江人，在读硕士，主要从事含钛高炉渣综合利用研究，E-mail：scukaikai@qq.com

通讯作者:
钟山，1985年出生，男，四川内江人，副教授，主要从事钛资源、煤炭资源清洁高效利用技术研究，E-mail：zhongshan@scu.edu.cn

中图分类号: TF823
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出版历程
- 收稿日期: 2023-03-12
- 刊出日期: 2023-06-30

Production of high-purity rutile titanium dioxide by leaching water-quenched titanium-bearing blast furnace slag with hydrochloric acid

School of Chemical Engineering, Sichuan University, Chengdu 610065, Sichuan, China

摘要

摘要: 采用盐酸法浸取水淬含钛高炉渣，固液分离后可得到富含钛、铝等有价元素的浸取液，再通过水解、沉淀等方式可制得高纯度金红石型二氧化钛、氧化铝等产品。系统研究了酸浓度、液固比、反应温度及反应时间等工艺条件对含钛高炉渣中不同元素浸出率的影响，确定了浸出反应的优化工艺条件。当反应温度为90 ℃，盐酸浓度为33%，液固比为15∶1（mL∶g），反应时间为30 min时，钛的浸出率可达到75.3%。130 ℃条件下对浸出液进行水解、干燥，即可得到纯度为97.7%的金红石型二氧化钛。该方法可直接从水淬含钛高炉渣中回收钛元素并制得高纯度二氧化钛产品，流程短，能耗低，可为含钛高炉渣的资源化利用提供支持。
- 含钛高炉渣 /
- 盐酸浸出 /
- 金红石二氧化钛
Abstract: Hydrochloric acid method was used for the leaching of water-quenched titanium-bearing blast furnace slag in this work. According to the leaching and solid-liquid separation process, valuable elements including titanium and aluminum were concentrated in the solution. With further hydrolysis and precipitation, high-purity rutile titanium dioxide and alumina oxide can be obtained. In order to obtain optimized leaching processing parameters, the effects of acid concentration, liquid-solid ratio, reaction temperature and reaction time on the leaching efficiency of different elements in titanium-bearing blast furnace slag were systematically investigated. When the leaching temperature is 90 °C, hydrochloric acid concentration is 33%, liquid-solid ratio is 15 : 1 (mL : g), and leaching time is 30 min, the leaching efficiency of titanium reaches 75.3%. By hydrolysis at 130 °C and following drying process, rutile titanium dioxide with a purity of 97.7% can be obtained. This method can be directly applied for the recovery of valuable titanium from the water-quenched titanium-bearing blast furnace slag and for the production of high purity titanium dioxide, with short process and low energy consumption, which can provide practical support for the resourceful utilization of titanium-bearing blast furnace slag.
- titanium-bearing blast furnace slag /
- hydrochloric acid leaching /
- rutile titanium dioxide

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图 1 水淬含钛高炉渣粒径分布

Figure 1. Particle size distribution of water-quenched titanium-bearing blast furnace slag

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图 2 水淬含钛高炉渣XRD谱

Figure 2. XRD pattern of water-quenched titanium-bearing blast furnace slag

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图 3 盐酸浸出水淬含钛高炉渣工艺流程

Figure 3. Process flowsheet of hydrochloric acid leaching of water-quenched titanium-bearing blast furnace slag

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图 4 盐酸浓度对含钛高炉渣中不同元素浸出率的影响

Figure 4. Effect of hydrochloric acid concentration on leaching rate of different elements in titanium-bearing blast furnace slag

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图 5 液固比对含钛高炉渣中不同元素浸出率的影响

Figure 5. Effect of liquid-solid ratio on leaching rate of different elements in titanium-bearing blast furnace slag

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图 6 反应温度对含钛高炉渣中不同元素浸出率的影响

Figure 6. Effect of reaction temperature on leaching rate of different elements in titanium-bearing blast furnace slag

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图 7 反应时间对含钛高炉渣中不同元素浸出率的影响

Figure 7. Effect of reaction time on leaching rate of different elements in titanium-bearing blast furnace slag

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图 8 原料渣的元素分布

Figure 8. Distribution of different elements in raw slag

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图 9 浸出渣的元素分布

Figure 9. Distribution of elements in leached slag

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图 10 浸出渣XRD谱

Figure 10. XRD pattern of leaching slag

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图 11 水解产物XRD谱

（a）45 ℃干燥；（b）850 ℃煅烧

Figure 11. XRD pattern of hydrolysate

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图 12 水解产物煅烧前后SEM形貌

Figure 12. SEM of hydrolysate before and after calcination

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图 13 水解产物粒径分布

Figure 13. Particle size distribution of hydrolysates

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图 14 水解率随水解时间的变化

Figure 14. Change of hydrolysis rate with hydrolysis time

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图 15 沉淀产物XRD谱

Figure 15. XRD pattern of precipitated product

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表 1 水淬含钛高炉渣的化学组成

Table 1. Chemical composition of water-quenched titanium-bearing blast furnace slag %

TiO₂ CaO MgO Al₂O₃ SiO₂ 其它

21.50 26.66 9.18 12.96 21.75 7.95

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