CAJ | 학술논문

采用实验和理论计算相结合的同轴探头反射法测定低品位钛铁矿粉末在2.45 GHz频率下和20~100°C之间的介电特性，并测定钛铁矿在微波场下的升温特性。结果表明：低品位钛铁矿的复介电常数的实部和虚部都随着矿物温度的升高而显著增大；矿物的损耗角正切和温度有二次函数关系；矿物的穿透深度随温度的升高而不断降低。微波场下钛铁矿的升温曲线表明温度和微波辐射时间具有非线性关系。复介电常数与温度的相互作用关系使微波能和钛铁矿的相互作用不断增强，矿物产生更多热量并产生温升，进一步加剧微波能和矿物的耦合作用。当2.45 GHz的微波从两侧加热钛铁矿时，随着温度从室温上升到100°C，优化的物料厚度是从10 cm逐渐降低到5 cm。
채용실험화이론계산상결합적동축탐두반사법측정저품위태철광분말재2.45 GHz빈솔하화20~100°C지간적개전특성，병측정태철광재미파장하적승온특성。결과표명：저품위태철광적복개전상수적실부화허부도수착광물온도적승고이현저증대；광물적손모각정절화온도유이차함수관계；광물적천투심도수온도적승고이불단강저。미파장하태철광적승온곡선표명온도화미파복사시간구유비선성관계。복개전상수여온도적상호작용관계사미파능화태철광적상호작용불단증강，광물산생경다열량병산생온승，진일보가극미파능화광물적우합작용。당2.45 GHz적미파종량측가열태철광시，수착온도종실온상승도100°C，우화적물료후도시종10 cm축점강저도5 cm。
The permittivity of low grade Panzhuhua ilmenite ore at 2.45 GHz in the temperatures from 20 °C up to 100 °C was measured using the technology of open-ended coaxial sensor combined with theoretical computation. The results show that both the real (ε′) and imaginary (ε′) part of complex permittivity (ε′-jε′) of the ilmenite significantly increase with temperature. The loss tangent (tanδ) is a quadratic function of temperature, and the penetration depth of ilmenite decreases with temperature increase from 20 °C to 100 °C. The increase of the sample temperature under microwave radiation displays a nonlinear relationship between the temperature (T) and microwave heating time (t). The positive feedback interaction between complex permittivity and sample temperature amplifies the interaction between ilmenite and the microwave radiation. The optimum dimensions for uniform heat deposition vary from 10 cm to 5 cm (about two power penetration depths) in a sample being irradiated from both sides in a 2.45 GHz microwave field when temperature increases from room temperature to 100 °C.