Microwave dielectric properties and thermochemical characteristics of the mixtures of walnut shell and manganese ore

Kangqiang Li, Jin Chen, Guo Chen, Jinhui Peng, Roger Ruan, C. Srinivasakannan

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80 Scopus citations

Abstract

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 (εr′), dielectric loss factors (εr″)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 × 10−4 (F/M), 1.66 × 10−4 (F/M), respectively; which were attributed to the MnO2 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.

Original languageBritish English
Article number121381
JournalBioresource Technology
Volume286
DOIs
StatePublished - Aug 2019

Keywords

  • Dielectric properties
  • Manganese ore
  • Thermochemical characteristics
  • Walnut shell

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