煤基还原焙烧法处理高品位氧化锰矿试验研究

为了有效开发利用海外高品质锰矿资源和提高我国锰系产品的生产水平，以进口高品位氧化锰矿为原料、煤为还原剂，对比研究了还原温度、还原时间与还原剂配比对粒矿、粉矿和内配炭球团矿3种焙烧物料还原率的影响。结果表明，3种焙烧物料的工艺条件略有差异，粒矿焙烧的最佳工艺条件为: 焙烧温度900 ℃、还原剂配比15%、焙烧时间70 min; 粉矿焙烧的最佳工艺条件为: 焙烧温度800 ℃、还原剂配比15%、焙烧时间60 min; 内配炭球团矿焙烧最佳工艺条件为: 焙烧温度850 ℃、还原剂配比15%、焙烧时间50 min。在最优条件下得到的焙烧料用硫酸浸出，不同焙烧物料各自的还原率与浸出率相差不大，粒矿可以保持在92%以上，粉矿和内配炭球团都可以达到95%左右，接近96.52%的理论还原率。

Experimental Study on Processing of High-Grade Manganse Oxide Ore by Coal-Based Reduction Roasting

In order to effectively exploit and utilize the overseas high-quality manganese ore resources and improve the production of manganese products in China, the reduction roasting experiments were performed with an imported high-grade manganese oxide ore as raw material and coal as the reducing agent. During the experiments, three kinds of roasting materials were prepared with that manganese oxide: granular material, powdered material and carbon-containing pellet prepared with powdered material. And the effects of reduction temperature, reduction time and the propotioning ratio of the reducing agent on the reduction rates of these three different kinds of roasting materials were also explored based on the comparison. The results showed that processing conditions for those three materials were slightly different. The optimal roasting conditions for the granular material included the roasting temperature of 900 ℃, the reducing agent with a proportioning ratio of 15% and the roasting time of 70 min; the optimal roasting conditions for the powdered material included the roasting temperature of 800 ℃, the reducing agent at a proportioning ratio of 15% and the roasting time of 60 min; the optimum roasting conditions for carbon-containing pellets included the roasting temperature of 850 ℃, the reducing agent at a proportioning ratio of 15%, and the roasting time of 50 min. The roasted products obtained from the optimum conditions were then leached with sulfuric acid. And it was found that there was not much difference between the obtained leaching rate and the previous reduction rate for each roasting material, showing the leaching rate and reduction rate of the granular material were kept above 92%, while those for the powdered material and the carbon-containing pellets were around 95%, approaching the theoretical reduction rate of 96.52%.