He Siqi, Wang Yan, Sun Hongjuan, Peng Tongjiang. Changes in Occurrence State of Ti,Si and Al Elements in Ti-bearing Blast Furnace Slag during Alkali Melting Process[J]. IRON STEEL VANADIUM TITANIUM, 2017, 38(1): 1-7. doi: 10.7513/j.issn.1004-7638.2017.01.001
Citation:
He Siqi, Wang Yan, Sun Hongjuan, Peng Tongjiang. Changes in Occurrence State of Ti,Si and Al Elements in Ti-bearing Blast Furnace Slag during Alkali Melting Process[J]. IRON STEEL VANADIUM TITANIUM, 2017, 38(1): 1-7. doi: 10.7513/j.issn.1004-7638.2017.01.001
He Siqi, Wang Yan, Sun Hongjuan, Peng Tongjiang. Changes in Occurrence State of Ti,Si and Al Elements in Ti-bearing Blast Furnace Slag during Alkali Melting Process[J]. IRON STEEL VANADIUM TITANIUM, 2017, 38(1): 1-7. doi: 10.7513/j.issn.1004-7638.2017.01.001
Citation:
He Siqi, Wang Yan, Sun Hongjuan, Peng Tongjiang. Changes in Occurrence State of Ti,Si and Al Elements in Ti-bearing Blast Furnace Slag during Alkali Melting Process[J]. IRON STEEL VANADIUM TITANIUM, 2017, 38(1): 1-7. doi: 10.7513/j.issn.1004-7638.2017.01.001
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
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.
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