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›› 2008, Vol. 8 ›› Issue (3): 535-539.

• 过程与工艺 • 上一篇    下一篇

黄铜矿环境无污染低温氯化新工艺

付念新 岩崎巌 玉川 小林   

  1. 东北大学材料冶金学院冶金物理化学 Natural Resources Research Institute, University of Minnesota, Coleraine
  • 收稿日期:2007-12-20 修回日期:2008-03-13 出版日期:2008-06-20 发布日期:2008-06-20
  • 通讯作者: 付念新

A New Process of Low-temperature Chlorination of Chalcopyrite Concentrate without Environmental Contamination

FU Nian-xin 岩崎巌 玉川建雄 小林幹男   

  1. School of Material and Metallurgy, Northeastern University Natural Resources Research Institute, University of Minnesota, Coleraine
  • Received:2007-12-20 Revised:2008-03-13 Online:2008-06-20 Published:2008-06-20
  • Contact: FU Nian-xin

摘要: 研究了流化床反应器低温氯化黄铜矿过程,考察了氯气供给量、温度和物料粒度对氯化行为、物料流动状况及反应产物的影响. 结果表明,为使黄铜矿充分氯化,氯气需适当过量;排气氯浓度不应超过0.015%,以避免S2Cl2及FeCl3挥发较多;提高温度可有效降低产物的硫含量,较佳温度为270℃,硫含量可降至2%~3%;物料粘结是温度过高、低熔点共晶软熔所致;物料粒度较大(147~208 mm)有利于流化床呈稳定流动状态. 在二段氯化实验中,下段反应器排出的氯气和S2Cl2在上段中消耗于黄铜矿氯化,最佳操作条件下(下段温度270℃且排气残氯浓度不超过0.015%,上段温度250~270℃),可得到硫含量平均2.8%的充分氯化产物,系统可连续、顺畅工作.

关键词: 黄铜矿, 低温氯化, 物料粘结, 流化床

Abstract: A low-temperature chlorination process of chalcopyrite concentrate was studied using a small fluidized bed reactor. The effects of Cl2 supply, temperature and particle size of the concentrate on the chlorination behavior, fluidization condition and reaction products were investigated. The results show that proper excess of Cl2 supply is necessary for full chlorination of the concentrate. The Cl2 concentration in effluent gases should not be beyond 0.015% in order to prevent the formation of more S2Cl2 and the vaporization of FeCl3. The increase in reaction temperature can effectively reduce the sulfur contents in the products, decreasing to 2%~3% at an appropriate temperature of 270℃. The sticking of the particles is due to the fritting of a low-melting-point eutectic mixture at high temperature. The particles with larger sizes (147~208 mm) are favorable for the fluidized bed to be in a steady-state fluidization state. The exhaust chlorine and S2Cl2 from the lower reactor are expended for the chlorination of the concentrate in the upper one in the two-stage chlorination experiment. The fully chlorinated products with an average 2.8% sulfur content can be obtained, and the system can continuously run smoothly under the optimized operating conditions (at 270℃ of the lower reactor temperature and within 0.015% of Cl2 concentration in the effluent gases, and at 250~270℃ of the upper reactor temperature).

Key words: chalcopyrite, low temperature chlorination, particle sticking, fluidized bed

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