黄铜矿氯化产物选择性氧化行为

研究了流化床反应器黄铜矿氯化产物的选择性氧化行为，结果表明，要保证流化床持续稳定工作，必须调整温度、N2流量、O2浓度、给料速度和物料含硫量等因素. 温度较高(390~410℃)时，物料不粘结，但氯化物挥发较多；较低温度(350~360℃)易出现的物料粘结问题可通过采用低残S物料、提高N2流量和O2浓度加以避免. 物料颗粒含少量CuCl和FeCl3，可产生低熔物，是氧化过程易粘结的原因. 使氯化产物在氧化物料中尽快分散并迅速氧化形成Fe2O3外层，是克服粘结的关键. 低硫物料可避免较多残余硫化物氧化或氯化放热造成的流化床过热、粘结.

Selective Oxidation Behavior of Chlorides Produced by Chlorination of Chalcopyrite Concentrate

The selective oxidation behavior of chlorides produced by chlorination of chalcopyrite concentrate was studied using a fluidized bed reactor. Balance among reaction temperature, flow rate of the carrier gas N_2, O_2 concentration, feed rate and percent sulfur in the chlorides has to be adjusted for satisfactory fluidization. Although the particles of raw materials do not frit at higher temperatures (390～410℃), more chlorides are vaporized. The fritting of particles readily occurring at a lower temperature (350～360℃) can be avoided by employing the raw materials with lower sulfur content, and raising N_2 flow rate and O_2 concentration. The reason for that the particles are ready at fritting in the process of oxidation is the formation of a low-melting-point eutectic mixture due to its containing of few CuCl and FeCl_3 in the raw materials. In order to overcome the fluidized bed fritting, it is critical to have the chlorinated products dispersed as soon as possible in the oxidizing particles and quickly oxidized to form an out layer of Fe_2O_3. Using the raw materials with lower sulfur content can avoid overheating and fritting of the fluidizing bed due to highly exothermic oxidation and chlorination reactions of more residual sulfides.