Abstract In practice, the dielectric constant of a material varies the applied frequency the material composition, particle size, purity, temperature, physical state (solid or liquid), and moisture content. All of these parameters might change during processing, therefore, it is difficult to predict how well a material will absorb microwave energy in a given process. When the temperature is measured by a digital thermometer, it could not accurately reflect the true temperature of the bulk materials, especially for mixed materials. Thus, in this paper we measured the microwave absorption characteristics of different materials by calorimetry. The microwave power levels, irradiation times, and masses of the materials were varied. It was difficult to predict the microwave energy absorption characteristics of reagent-grade inorganic compounds based on their color, metallic cation, or water stoichiometry. CuO, MnO2, Fe3O4, and MnSO4•H2O(Taishan) strongly absorbed microwave energy. Most of the remaining inorganic compounds were poor absorbers, with silica hardly absorbing any microwave energy. Carbon-based materials had significantly different microwave absorption characteristics. Activated carbon and coke were especially sensitive to microwaves, but different types of coal were poor absorbers. The jamesonite concentrate absorbed microwave energy strongly, while the zinc concentrate was a poor absorber.

中文翻译：

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某些固体材料的微波吸收量热研究

摘要 在实践中，材料的介电常数会随着材料成分、粒径、纯度、温度、物理状态（固体或液体）和水分含量的应用频率而变化。所有这些参数都可能在加工过程中发生变化，因此，很难预测材料在给定过程中吸收微波能量的程度。用数显温度计测温时，不能准确反映散状物料的真实温度，尤其是混合物料。因此，在本文中，我们通过量热法测量了不同材料的微波吸收特性。材料的微波功率水平、照射时间和质量是不同的。很难根据颜色、金属阳离子或水的化学计量来预测试剂级无机化合物的微波能量吸收特性。CuO、MnO2、Fe3O4和MnSO4•H2O(Taishan)强烈吸收微波能量。大多数剩余的无机化合物是吸收不良的物质，二氧化硅几乎不吸收任何微波能量。碳基材料具有显着不同的微波吸收特性。活性炭和焦炭对微波特别敏感，但不同类型的煤吸收性差。翡翠精矿强烈吸收微波能量，而锌精矿吸收较差。大多数剩余的无机化合物是吸收不良的物质，二氧化硅几乎不吸收任何微波能量。碳基材料具有显着不同的微波吸收特性。活性炭和焦炭对微波特别敏感，但不同类型的煤吸收性差。翡翠精矿强烈吸收微波能量，而锌精矿吸收较差。大多数剩余的无机化合物是吸收不良的物质，二氧化硅几乎不吸收任何微波能量。碳基材料具有显着不同的微波吸收特性。活性炭和焦炭对微波特别敏感，但不同类型的煤吸收性差。翡翠精矿强烈吸收微波能量，而锌精矿吸收较差。