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肖亚琼,付广义,钟振宇,成应向,向仁军.高砷河道尾砂还原焙烧脱砷研究[J].广西科学,2016,23(1):86-91. [点击复制]
- XIAO Yaqiong,FU Guangyi,ZHONG Zhenyu,CHENG Yingxiang,XIANG Renjun.Experiment Research on Removal of Arsenic in the High Arsenic Tailings by the Reducing Roast Method[J].Guangxi Sciences,2016,23(1):86-91. [点击复制]
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| 高砷河道尾砂还原焙烧脱砷研究 |
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肖亚琼1,2,3, 付广义2,3, 钟振宇2,3, 成应向2,3, 向仁军2
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| (1.湖南农业大学, 湖南长沙 410128;2.湖南省环境保护科学研究院, 湖南长沙 410004;3.水污染控制技术湖南省重点实验室, 湖南长沙 410004) |
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| 摘要: |
| [目的]对河道尾砂富集分离形成的高砷尾砂进行脱砷处理,使之达到高炉冶炼的要求。[方法]在前期氧化焙烧脱砷研究的基础上,分别采用煤基还原焙烧工艺和气基还原焙烧工艺对含砷量为0.47%的河道尾砂氧化焙烧渣进行脱砷试验。考察焙烧温度、时间、还原气氛CO/(CO+CO2)和空气流速等主要影响因子对脱砷效果的影响。[结果]气基还原焙烧的脱砷效果优于煤基还原焙烧。气基还原焙烧的适宜条件:焙烧温度900℃、焙烧时间约30min、CO/(CO+CO2)浓度20%、气体流量0.5m3/h;在适宜的气基还原焙烧条件下,焙烧尾砂中砷的含量可降至0.058%,脱砷率达87.66%。[结论]经气基还原焙烧工艺得到的河道尾砂还原焙烧渣能满足高炉炼铁的要求。 |
| 关键词: 河道尾砂 还原焙烧 脱砷 |
| DOI：10.13656/j.cnki.gxkx.20160315.013 |
| 投稿时间：2015-12-12 |
| 基金项目:国家水体污染控制与治理科技重大专项项目(2010ZX07212-008-03)和湖南省科技计划项目(2014FJ6035)资助。 |
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| Experiment Research on Removal of Arsenic in the High Arsenic Tailings by the Reducing Roast Method |
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XIAO Yaqiong1,2,3, FU Guangyi2,3, ZHONG Zhenyu2,3, CHENG Yingxiang2,3, XIANG Renjun2
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| (1.Hunan Agricultural University, Changsha, Hunan, 410128, China;2.Hunan Province Environmental Protection Science Research Institute, Changsha, Hunan, 410004, China;3.Hunan Key Laboratory of Water Pollution Control Technology, Changsha, Hunan, 410004, China) |
| Abstract: |
| [Objective] After river sand separation, the high arsenic tailings were formed, of which arsenic removal treatment was performed to meet the requirements for iron making.[Methods] Based on the preliminary study of arsenic removal by oxidizing roast, both the coal-based and the atmosphere reduction roasting processes were used to remove the arsenic in the river tailings' oxidizing roasting slag, of which the high arsenic content was up to 0.47%.The impact of major factors on the arsenic removal efficiency were investigated, including calcination temperature and time, reducing atmosphere and air flow.[Results] The results showed that the atmosphere reductive roasting process exhibited higher efficiency in arsenic removal from the oxidi-zing roasting slag than the coal-based reduction roasting process.The optimum conditions of atmosphere reductive roasting process were further ascertained.The best calcination temperature was 900℃ and the roasting time was about 30 min.Meanwhile, the suitable concentration of CO/(CO+CO2) was 20% and the gas flow was 0.5 m3/h.Under above demonstrated appropriate conditions of reduction roasting, the arseniccontent of oxidizing roasting slag could be reduced to 0.058%, and the corresponding arsenic removal efficiency reached to 87.66%.[Conclusion] The reduction roasting slag obtained by atmosphere reductive roasting treatment can completely meet the requirements of blast furnace smelting on raw material. |
| Key words: mine tailings reduction roasting arsenic removal |
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