含钛高炉渣在碱熔过程中Ti、Si、Al元素赋存状态的变化

何思祺; 王岩; 孙红娟; 彭同江

doi:10.7513/j.issn.1004-7638.2017.01.001

含钛高炉渣在碱熔过程中Ti、Si、Al元素赋存状态的变化

doi: 10.7513/j.issn.1004-7638.2017.01.001

何思祺^1,2,
王岩³,
孙红娟^1,2,
彭同江^1,2

1. 西南科技大学固体废物处理与资源化省部共建教育部重点实验室, 四川绵阳 621010;
2. 西南科技大学矿物材料及应用研究所, 四川绵阳 621010;
3. 四川省环境工程自控技术重点实验室, 四川绵阳 621010

基金项目:

国家自然科学基金(41372052)；四川省创新团队项目(14TD0012)；西南科技大学研究生创新基金资助项目(14ycx0036)；四川省科技创新苗子工程资助项目(2016100)。

详细信息

作者简介:
何思祺(1989-),女,四川广安人,博士生,主要从事尾矿资源化利用相关研究工作。

中图分类号: X757,TF823
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出版历程
- 收稿日期: 2016-04-06

Changes in Occurrence State of Ti,Si and Al Elements in Ti-bearing Blast Furnace Slag during Alkali Melting Process

1. Key Laboratory of Ministry of Education for Solid Waste Treatment and Resource Recycle, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China;
2. Institute of Mineral Materials & Application, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China;
3. Key Laboratory of Sichuan Province Auto Control Technology of Environment Engineering, Mianyang 621010, Sichuan, China

摘要

摘要: 以攀枝花含钛高炉渣为原料, 采用氢氧化钠碱熔法分离炉渣中的有价组分, 通过对碱熔过程中不同反应阶段所形成的碱熔渣及水浸渣的结构和谱学特征进行分析和表征, 研究不同温度条件下原始矿物相及中间产物的化学反应过程, 揭示含钛高炉渣碱熔过程中各有价组分赋存状态的变化。结果表明:在碱熔过程中, 283℃时, 含钛高炉渣中透辉石相结构被破坏, Si⁴⁺离子形成Na₂SiO₃可溶性盐和中间产物CaMgSiO₄, 随着反应的进行, CaMgSiO₄进一步与NaOH发生反应生成难溶物Na₂CaSiO₄;当碱熔温度升高到296℃时, 镁铝尖晶石中Si⁴⁺与NaOH反应生成可溶性盐Na₂SiO₃;当碱熔温度为320℃时, 钙钛矿晶体结构开始被破坏, Ti⁴⁺离子与NaOH作用生成难溶物Na₂TiO₃, 经水浸后Na₂TiO₃晶形被破坏, 变为无定型结构残留于水浸渣中。
- 含钛高炉渣 /
- 碱熔 /
- 分离 /
- 物相变化
Abstract: By sodium hydroxide melting process,separation of components from Ti-bearing blast furnace slag in Panzhihua was conducted in this paper. The chemical reaction processes of the original mineral phase and intermediate products at different temperatures were investigated by analyzing the structure and spectroscopic characteristics of the alkali melting slag and water leaching slag formed at different reaction stages,revealing the changes in occurrence state of the components in Ti-bearing blast furnace slag during the alkali melting process. The results show that at 283 ℃ the diopside phase in the slag is damaged,and the soluble salt Na₂SiO₃ and intermediate product CaMgSiO₄ can be formed due to the reactions between Si⁴⁺ and NaOH. With the reactions progressing,Ca MgSiO₄ further reacts with NaOH to generate insoluble Na₂CaSiO₄. When the reaction temperature is up to 296 ℃,the Si⁴⁺ in magnesia-alumina spinel reacts with NaOH to form Na₂SiO₃. When the alkali fusion temperature is 320 ℃,perovskite phase begins to decompose,and Ti⁴⁺ reacts with NaOH to generate insoluble Na₂TiO₃,which remains in the leaching slag as amorphous structure after Na₂TiO₃structure is destructed by water leaching.
- Ti-bearing blast furnace slag /
- alkali fusion /
- separation /
- phase change