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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(147～208μm)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.
The process of low temperature chlorination of chalcopyrite in a fluidized bed reactor was studied and the effects of chlorine supply, temperature and particle size on the chloridation behavior, material flow and reaction products were investigated.The results show that in order to fully chlorinate the chalcopyrite , Chlorine should be appropriate excess; exhaust chlorine concentration should not exceed 0.015%, in order to avoid more volatile S2Cl2 and FeCl3; increase the temperature can effectively reduce the sulfur content of the product, the better temperature is 270 ℃, the sulfur content can be reduced to 2% 3%; material bonding is caused by over-temperature and low-melting eutectic refractories; large particle size (147 ~ 208μm) is conducive to the steady flow of the fluidized bed.In the second-stage chlorination experiment, the lower reactor Exhaust chlorine and S2Cl2 are consumed in the chalcopyrite chlorination in the upper section. Under the optimum operating conditions (the lower temperature is 270 ° C and the residual chlorine concentration in the exhaust is less than 0.015% and the upper temperature is 250-270 ° C), the average sulfur content 2.8% of fully chlorinated products, the system can be continuous and smooth work.