锌灰含碳球团直接还原试验

锌灰是热镀锌厂和电解锌厂生产过程中产生的一种副产品,主要成分为氧化锌,是生产直接法氧化锌的主要原料。传统的直接法氧化锌生产工艺落后,装备水平差,能源消耗高,资源回收率低。为了提高锌灰生产直接法氧化锌的绿色化水平,开发了锌灰含碳球团直接还原新技术。试验研究了不同工艺参数对锌灰含碳球团直接还原的影响关系,得到最佳的工艺条件为:还原温度为1200℃,还原时间为60min,煤粉配加量为20%,CaO配加量为4%。在上述工艺条件下,锌灰中氧化锌的还原率可以达到95.5%,显著提高了锌的回收率。

Experiment on direct reduction of zinc ash pellets containing carbon

Zinc ash is a by product of hot galvanizing or zinc electrolysis process. Its main component is zinc oxide. It is also the main raw material for the production of zinc oxide by the direct method. The zinc oxide production process by the traditional direct method is backward, the equipment is poor, the energy consumption is high, and the resource recovery rate is low. In order to improve the green level of the zinc oxide production by the direct method, the new direct reduction process of zinc ash pellet containing carbon was developed. The effects of different process parameters on the direct reduction of zinc ash pellets containing carbon were researched. The optimum reaction parameters were obtained as the following: the reduction temperature was 1 200 ℃, the reaction time was 60 min, the coal adding amount was 20% and the CaO adding amount was 4%. Under the above reaction conditions, the reduction rate of zinc oxide in zinc ash can reach 95.5%. It is significantly improved the recovery rate of zinc.