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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℃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℃,优化的物料厚度是从10 cm逐渐降低到5 cm。
The dielectric properties of low-grade ilmenite powders at 2.45 GHz and temperatures between 20 and 100 ℃ were determined by the coaxial probe reflection method, which was a combination of experimental and theoretical calculations. The temperature rising characteristics of ilmenite under microwave field were also determined. The results show that both the real part and the imaginary part of the complex permittivity of low grade ilmenite increase significantly with the increase of mineral temperature; the tangent of loss tangent to temperature has a quadratic function; the penetration depth of mineral With the temperature increases and continue to decline. The temperature rising curve of ilmenite under the microwave field shows that the temperature has a nonlinear relationship with the microwave radiation time. The interaction between complex permittivity and temperature increases the interaction between microwave energy and ilmenite, the minerals generate more heat and produce temperature rise, which further aggravates the coupling between microwave energy and minerals. As the 2.45 GHz microwave heated the ilmenite from both sides, the material thickness was gradually reduced from 10 cm to 5 cm as the temperature rose from room temperature to 100 ° C.