Key Laboratory of Unconventional Metallurgy, Ministry of Education, Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, PR China.
Key Laboratory of Unconventional Metallurgy, Ministry of Education, Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, PR China; Key Laboratory of Green-Chemistry Materials in University of Yunnan Province, Yunnan Minzu University, Kunming 650500, PR China; Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resources, Central South University, Changsha 410083, Hunan, PR China.
Bioresour Technol. 2019 Aug;286:121381. doi: 10.1016/j.biortech.2019.121381. Epub 2019 Apr 25.
In this work, dielectric properties and thermochemical characteristics of mixtures of walnut shell and manganese ore were systematically investigated. Results indicated that reducing manganese ore by walnut shell was divided into four stages identified by temperatures: <150 °C, 150 °C-300 °C, 300 °C-480 °C, greater than 480 °C. Higher than 200 °C, the dielectric constants (ε'), dielectric loss factors (ε″) and loss tangent coefficients (tan δ) of mixture at a ore/biomass mixing ratio of 10:1.2 were observed to suddenly drop to low levels, with 5.107 (F/M), 8.5 × 10 (F/M), 1.66 × 10 (F/M), respectively; which were attributed to the MnO reduced by the reductive volatiles produced by biomass pyrolysis. Meanwhile, the volatiles rendered a decrease in density and dielectric properties of the mixture. The work highlights the possibility of reducing manganese ore by walnut shell with microwave heating.
在这项工作中，系统研究了核桃壳和锰矿混合物的介电特性和热化学特性。结果表明，用核桃壳还原锰矿可分为四个阶段，用温度来识别：<150°C、150°C-300°C、300°C-480°C、大于 480°C。高于 200°C 时，在矿石/生物质混合比为 10:1.2 的情况下，混合物的介电常数（ε'）、介电损耗因子（ε″）和损耗正切系数（tan δ）突然降至低水平，分别为 5.107（F/M）、8.5×10（F/M）、1.66×10（F/M）；这归因于生物质热解产生的还原挥发物还原的 MnO。同时，挥发物降低了混合物的密度和介电性能。这项工作突出了用微波加热用核桃壳还原锰矿的可能性。
