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过程工程学报 ›› 2018, Vol. 18 ›› Issue (6): 1219-1225.DOI: 10.12034/j.issn.1009-606X.217429

• 反应与分离 • 上一篇    下一篇

铁基脱硫渣再生制备铁酸钠及其循环脱硫

李一飞， 彭志宏*， 王一霖， 刘桂华， 周秋生， 齐天贵， 李小斌   

  1. 中南大学冶金与环境学院，难冶有色金属资源高效利用国家工程实验室，湖南 长沙 410083
  • 收稿日期:2017-12-19 修回日期:2018-03-25 出版日期:2018-12-22 发布日期:2018-12-19
  • 通讯作者: 彭志宏 pengzh@csu.edu.cn
  • 基金资助:
    国家自然科学基金项目资助;国家自然科学基金项目资助

The regeneration of sodium ferrite from iron-based desulfurization residue and its circulation desulfurization

Yifei LI, Zhihong PENG*, Yilin WANG, Guihua LIU, Qiusheng ZHOU, Tiangui QI, Xiaobin LI   

  1. National Engineering Laboratory for Efficient Utilization of Refractory Non-ferrous Metals Resources, School of Metallurgy and Environment, Central South University, Changsha, Hunan 410083, China
  • Received:2017-12-19 Revised:2018-03-25 Online:2018-12-22 Published:2018-12-19
  • Contact: PENG Zhi-hong Zhi-hongZhi-hong pengzh@csu.edu.cn

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摘要： 用Fe2O3与Na2CO3制备铁酸钠用于脱除含硫铝酸钠溶液中的硫，采用氧化焙烧及水浸方式对铁基脱硫渣(NaFeS2?2H2O)进行再生，研究了其循环脱硫效果. 结果表明，铁基脱硫渣于950℃下在氧化性气氛中焙烧1 h，可除去脱硫渣中70%的硫；将焙烧渣水浸，硫含量降至0.2%以下，总硫去除率达99%. 将除硫后的浸出渣再制备铁酸钠用于循环脱硫，脱硫率可达67.65%，与初始脱硫剂的脱硫率(69.09%)相当，可实现铁基脱硫剂的再生循环. 焙烧时渣中硫主要以SO2气体排出，剩余可溶性Na2SO4则在水浸过程中进入溶液而被除去.

关键词: 脱硫渣, 氧化焙烧, 铁酸钠, 再生

Abstract: Along with the increasing scarcity of high quality bauxite and the gradual growth of alumina capacity, resource is crucial for restricting alumina industry development in China. As for there are large amount of refractory diasporic bauxite with high sulfur content in many regions of China, it is significant to investigate the efficiently utilization method of high sulfur bauxite. There are some related research showed that sodium ferrite was used to remove the sulfur in sulfur bearing sodium aluminate solution and the desulfurization effect was verified, which was prepared by Fe2O3 and Na2CO3. For the purpose of sodium ferrite regeneration, this dissertation presented a roasting-leaching process of sulfur removal from desulfurization residue. The process entailed roasting of desulfurization residue in oxidizing atmosphere and the roasted product was leached with water subsequently. Iron-based desulfurization residue (NaFeS2?2H2O) was a solid phase product from the sodium ferrite after removed the S2? in sodium aluminate solution. The regeneration and cyclic desulfurization of iron-based desulfurization residue (NaFeS2?2H2O) by oxidizing roasting and water leaching were investigated by DTG and XRD. The results indicated that oxidizing atmosphere was beneficial to the decomposition of NaFeS2?2H2O and the separation of sulfur and iron in the roasting process. The desulfurization rate was 70% by roasting the iron-based desulfurization residue under oxidizing atmosphere at 950℃ for 1 h. The sulfur content in roasted residue can be further reduced to less than 0.2% after leaching by water and the total sulfur removal rate could reach 99%. The sodium ferrite was prepared by the leaching residue and the cyclic desulfurization rate was up to 67.65%, which was very close to the initial desulfurization rate (69.09%). This conclusion indicated that the iron-based desulfurization residue can be regenerated and cyclic desulfurized. The sulfur in the desulfurization residue was discharged in the form of SO2 during the roasting process, while the rest sulfur was removed in form of Na2SO4 by water leaching. These results will contribute to the purification of the sulfur containing sodium aluminate solution and the utilization of the high-sulfur bauxite.

Key words: desulfurization residue, oxidizing roasting, sodium ferrite, regeneration