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Direct Reduction of Copper Slag Composite Pellets Within Lignite Using Biomass as Binder

机译：使用生物质作为粘合剂直接减少褐煤中的铜渣复合颗粒

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The resource utilization of copper slag is an attractive option of iron resource. Thermal energy recovery and direct reduction (TER-DR) system was proposed in this study. By theoretical analysis, the exergy efficiency of this system can reach to 57.3%. To investigate the feasibility of TER-DR system, copper slag composite pellets within lignite were prepared. As a new binder, pine sawdust was added into the pellets. The diameter of pellets was 20 mm in experiments and the compressive strength of them was up to 831 N when the addition ratio of biomass was 29%. The results showed that the overall iron recovery reached to 90% and the separated iron concentrate was up to 93.5% when the temperature is at 1423 K for 90 min with CaO addition ratio of 0.3. The process reduces the secondary environmental pollution of copper slag and will be applied well in the future.
机译：铜渣的资源利用是铁资源的有吸引力的选择。本研究提出了热能回收和直接减少（TER-DR）系统。通过理论分析，该系统的高级效率可达57.3％。为了研究TER-DR系统的可行性，制备褐煤中的铜渣复合粒料。作为一种新的粘合剂，松木锯末加入颗粒中。实验中颗粒的直径为20mm，当生物质的添加比例为29％时，它们的抗压强度高达831n。结果表明，当温度为1423K时，达到90％的总铁回收率高达93.5％，CaO加入比为0.3。该过程减少了铜渣的二级环境污染，将来会很好地应用。

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