微波場中錳礦物微結(jié)構(gòu)及物料組成與其吸波性能的相關(guān)性研究
發(fā)布時(shí)間：2019-02-16 00:20
【摘要】：礦物吸收微波能力及吸波機(jī)理是礦物能否應(yīng)用微波進(jìn)行處理以及處理工藝選擇、處理設(shè)備開發(fā)的關(guān)鍵因素。本論文從礦物在微波場中的升溫速率、礦物的電磁參數(shù)、礦物吸收微波能量三個(gè)角度探討礦物吸收微波能力；并運(yùn)用熱重差熱、掃描電鏡、XRD精修等分析方法來研究礦物自身微結(jié)構(gòu)對其吸波能力的影響；最后探討不同組成的混合礦物吸收微波能量與其宏觀性能的相關(guān)性。結(jié)果表明：(1)升溫速率法、介電常數(shù)法、中間介質(zhì)量熱法三種方法從三個(gè)角度探討礦物對微波的敏感性。對純礦物而言,三種評價(jià)方法獲得的結(jié)論差別不大；對混合礦物而言,存在顯著差異；升溫速率法較為直觀的反應(yīng)物料在微波場中實(shí)際溫度的變化規(guī)律；介電常數(shù)法從物料電磁特性的角度揭示物料對微波的敏感性；中間介質(zhì)量熱法從能量角度分析微波場中物料對微波能量的利用規(guī)律。(2)升溫速率法、介電常數(shù)法、中間介質(zhì)量熱法等三種方法研究礦物吸波能力時(shí),除了大新二氧化錳礦和錳金屬單質(zhì)粉末,三種方法的測試的基本規(guī)律基本一致。γ-MnO2對微波的敏感性最強(qiáng),其次是臺山MnSO4·H2O和MnCO3,之后是Mn2O3和Mn3O4, MnO和天津MnSOH2O的對微波的敏感性最弱。(3)礦物的成分和結(jié)構(gòu)是影響礦物吸收微波能量相對值的關(guān)鍵因素。研究發(fā)現(xiàn),臺山MnSO4H2O和天津MnSO4-H2O,γ-MnO2和β-MnO2其成分相同,但其吸收微波能量相對值差異較大,說明礦物微觀結(jié)構(gòu)對吸收微波能量相對值影響顯著。(4)熱重差熱分析及XRD結(jié)構(gòu)精修等分析結(jié)果表明,結(jié)晶水及其結(jié)合方式、晶粒尺寸、晶格畸變是影響礦物吸收微波能量的主要原因。(5)天津MnSO4·H2O的晶粒尺寸和晶格畸變都比臺山的大,而β-MnO2晶粒尺寸小于γ-MnO2,但其晶格畸變卻大于γ-MnO2;晶粒尺寸小的臺山MnSO4·H2O和β-MnO2都表現(xiàn)出了強(qiáng)的吸波能力。(6)混合物料微波吸收能量規(guī)律表明,物料混合后依然保持各自的吸波特性,不吸收微波或吸波弱的物質(zhì)的存在并不會影響強(qiáng)吸波物質(zhì)自身的吸波特性。(7)自身的吸波能力對混合物料在微波場中吸收微波能量有顯著影響。隨著強(qiáng)吸波物質(zhì)的質(zhì)量百分比的增加,混合物料吸波能量呈非線性上升。(8)對于強(qiáng)吸波物質(zhì)MnO2和弱吸波物質(zhì)MnCO3來說,更換中間介質(zhì)后相對微波能變化趨勢相似,但其吸收微波能量的相對值不同。物料吸收微波能量相對值與中間介質(zhì)吸波能量呈負(fù)相關(guān)。(9)不同的物質(zhì)放入微波腔體,當(dāng)體積足夠大時(shí),都會不同程度影響腔體內(nèi)微波的有效利用率。強(qiáng)吸波物質(zhì)存在腔體時(shí),腔體損耗小,微波利用率高；弱吸波物質(zhì)存在腔體時(shí),腔體損耗大,微波利用率低。
[Abstract]:The microwave absorption ability and absorbing mechanism of minerals are the key factors for the treatment of minerals by microwave, the selection of treatment process and the development of treatment equipment. In this paper, the microwave absorption capacity of minerals is discussed from three aspects: the heating rate of minerals in microwave field, the electromagnetic parameters of minerals, and the absorption of microwave energy by minerals. Thermogravimetric differential thermal analysis, scanning electron microscopy and XRD refinement were used to study the effect of mineral microstructure on their microwave absorption ability. Finally, the correlation between microwave energy absorption and macroscopic properties of mixed minerals was discussed. The results show that: (1) the sensitivity of minerals to microwave is discussed from three aspects: (1) heating rate method, dielectric constant method and mesomorphic mass calorimetry method. For pure minerals, the conclusions obtained by the three evaluation methods are not different; for mixed minerals, there are significant differences; The dielectric constant method reveals the sensitivity of the material to microwave from the point of view of the electromagnetic characteristics of the material. The use of microwave energy by materials in microwave field is analyzed from the angle of energy. (2) three methods, I. e., heating rate method, dielectric constant method and intermediate dielectric mass calorimetry method, are used to study the microwave absorbing ability of minerals. Except for Daxin manganese dioxide ore and manganese metal powder, the basic rules of the three methods are basically the same. 緯-MnO2 is the most sensitive to microwave, followed by MnSO4 H2O and MnCO3, in Taishan, Mn2O3 and Mn3O4,. MnO and Tianjin MnSOH2O have the weakest sensitivity to microwave. (3) the composition and structure of minerals are the key factors affecting the relative value of microwave energy absorbed by minerals. It is found that the components of Taishan MnSO4H2O and Tianjin MnSO4-H2O, 緯-MnO2 and 尾-MnO2 are the same, but the relative values of absorbing microwave energy are quite different. The results of thermogravimetric differential thermal analysis and XRD structure refinement show that the crystalline water and its bonding mode, grain size, and so on, have a significant effect on the absorption of microwave energy. Lattice distortion is the main reason affecting mineral absorbing microwave energy. (5) the grain size and lattice distortion of Tianjin MnSO4 H2O are larger than that of Taishan, while 尾-MnO2 grain size is smaller than 緯-MnO2, but its lattice distortion is larger than 緯-MnO2;. The small grain size of Taishan MnSO4 H2O and 尾-MnO2 showed strong absorbing ability. (6) the microwave absorption energy law of mixed materials shows that the materials still have their own absorbing characteristics after mixing. The existence of non-absorbing or weakly absorbing materials does not affect the absorption characteristics of the strong absorbing materials. (7) the absorbing ability of the mixture material has a significant effect on the absorption of microwave energy in the microwave field. With the increase of mass percentage of strong absorbing materials, the absorbing energy of mixed materials increases non-linear. (8) for MnO2 and MnCO3, the change trend of microwave energy is similar after replacing intermediate medium. But the relative value of absorbing microwave energy is different. The relative value of microwave energy absorbed by materials is negatively correlated with the absorbing energy of intermediate medium. (9) when different substances are put into the microwave cavity, when the volume is large enough, the effective utilization rate of microwave in the cavity will be affected to some extent. When the strong absorbing material exists in the cavity, the cavity loss is small, and the microwave utilization ratio is high, while the weak absorbing material exists in the cavity, the cavity loss is large and the microwave utilization ratio is low.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD912
本文編號：2423847
[Abstract]:The microwave absorption ability and absorbing mechanism of minerals are the key factors for the treatment of minerals by microwave, the selection of treatment process and the development of treatment equipment. In this paper, the microwave absorption capacity of minerals is discussed from three aspects: the heating rate of minerals in microwave field, the electromagnetic parameters of minerals, and the absorption of microwave energy by minerals. Thermogravimetric differential thermal analysis, scanning electron microscopy and XRD refinement were used to study the effect of mineral microstructure on their microwave absorption ability. Finally, the correlation between microwave energy absorption and macroscopic properties of mixed minerals was discussed. The results show that: (1) the sensitivity of minerals to microwave is discussed from three aspects: (1) heating rate method, dielectric constant method and mesomorphic mass calorimetry method. For pure minerals, the conclusions obtained by the three evaluation methods are not different; for mixed minerals, there are significant differences; The dielectric constant method reveals the sensitivity of the material to microwave from the point of view of the electromagnetic characteristics of the material. The use of microwave energy by materials in microwave field is analyzed from the angle of energy. (2) three methods, I. e., heating rate method, dielectric constant method and intermediate dielectric mass calorimetry method, are used to study the microwave absorbing ability of minerals. Except for Daxin manganese dioxide ore and manganese metal powder, the basic rules of the three methods are basically the same. 緯-MnO2 is the most sensitive to microwave, followed by MnSO4 H2O and MnCO3, in Taishan, Mn2O3 and Mn3O4,. MnO and Tianjin MnSOH2O have the weakest sensitivity to microwave. (3) the composition and structure of minerals are the key factors affecting the relative value of microwave energy absorbed by minerals. It is found that the components of Taishan MnSO4H2O and Tianjin MnSO4-H2O, 緯-MnO2 and 尾-MnO2 are the same, but the relative values of absorbing microwave energy are quite different. The results of thermogravimetric differential thermal analysis and XRD structure refinement show that the crystalline water and its bonding mode, grain size, and so on, have a significant effect on the absorption of microwave energy. Lattice distortion is the main reason affecting mineral absorbing microwave energy. (5) the grain size and lattice distortion of Tianjin MnSO4 H2O are larger than that of Taishan, while 尾-MnO2 grain size is smaller than 緯-MnO2, but its lattice distortion is larger than 緯-MnO2;. The small grain size of Taishan MnSO4 H2O and 尾-MnO2 showed strong absorbing ability. (6) the microwave absorption energy law of mixed materials shows that the materials still have their own absorbing characteristics after mixing. The existence of non-absorbing or weakly absorbing materials does not affect the absorption characteristics of the strong absorbing materials. (7) the absorbing ability of the mixture material has a significant effect on the absorption of microwave energy in the microwave field. With the increase of mass percentage of strong absorbing materials, the absorbing energy of mixed materials increases non-linear. (8) for MnO2 and MnCO3, the change trend of microwave energy is similar after replacing intermediate medium. But the relative value of absorbing microwave energy is different. The relative value of microwave energy absorbed by materials is negatively correlated with the absorbing energy of intermediate medium. (9) when different substances are put into the microwave cavity, when the volume is large enough, the effective utilization rate of microwave in the cavity will be affected to some extent. When the strong absorbing material exists in the cavity, the cavity loss is small, and the microwave utilization ratio is high, while the weak absorbing material exists in the cavity, the cavity loss is large and the microwave utilization ratio is low.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD912
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