Pure fossil characteristics of microwave heating
    For a particular mineral , depends only on the temperature of the microwave power P size. Strictly speaking , should be within the material depends on the material density of the microwave energy , the microwave power per unit mass in size. Although the formula Middle reflect time the influence of temperature , but with time, the limited space is always more microwave energy , the greater energy density results . For simplicity , the material temperature can be seen as a function of heating time . Heating with horizontal axis represents time , the vertical mark indicates the material to do the experiment temperature measured in various types of natural pure mineral heating in the microwave field test was performed on a calendar has been modified to complete household microwave oven , heating the inert gas protection. Materials used are collected from a different mine ore . Hand-selected by artificial obtained after natural pure mineral purity greater than 95% of one : Another part of the chemically pure minerals.
    As can be seen , oxide and sulphide ore ( other than silicon hole outside Stone Street ) , all have a significant temperature rise , a strong microwave absorbing material . The non-metallic minerals ( mainly for its ore veins Wan mineral types ) almost does not increase the temperature of the microwave is only through action and reflection , small temperature increase may be due to the material in the water . Mineral differences in response to microwave heating , and it is broadly consistent with the differences in the dielectric constant . Such as dielectric constant of 33.7-81 pyrite , chalcopyrite greater than 81 , magnetite 33.7-81 , 15-17 , etc. galena . The gangue minerals typically only five or so. A large dielectric constant of the material, its temperature rise is more rapid . However, in the heating process , the dielectric constant with temperature change, in general , the temperature in Vietnam , the smaller its value . That is, the metallic minerals the microwave absorption capacity , it will vary with the temperature rises. Meanwhile, when the temperature rises to one value, it is possible to sulphide oxidation into another substance , the dielectric constant is naturally changed. Such as pyrite , dielectric constant 33.7-81 , once oxidized to the ferric oxide , the dielectric constant decreases to 25. Because of these two reasons , the initial microwave radiation , the temperature rises very rapidly OBJECTS curve slope of the line reflects the approximate high rise ; with time , the curve becomes almost slow upward trend , close to a an asymptote ( mineral melt , producing gas · concentrated balancing time ) .
    In addition to the impact of the dielectric constant , the ion types on temperature also has a significant impact. Containing transition metals ( such as iron ) minerals and mineral copper ions , have a large group of polarizability . Members of these elements or ions outer d electron, ion radius, forming the mineral , it is easy to be lost as a result, ionic bonding minerals and tend to metal bond , showing the nature of the conductor , the dielectric loss factor , the temperature will easily increased. Galena is a graph of a typical example of this theory , although not a maximum dielectric constant , but for the dielectric loss factor , heating it rapidly. Those with the formation of covalent minerals such as zinc and antimony minerals , showing non-conductive , and its microwave heating it slowly.
    Microwave heating of metal oxide ore characteristics and regularity. With sulfide minerals are very similar, but with increasing temperature trend curve gently without sulphide as obvious. Iron oxide ore and ore containing tin oxide temperature quickly , especially magnetite. This is due to the existence of its internal magnetic domains , not only in the overall form of polarization rotation , great energy , and under the action of an external electric field formed a regional small farms , more conducive to temperature. Containing silicon , calcium oxide ore , the temperature rises slowly. In particular chrysocolla , as compared with the copper oxide can be said that there is little change in the temperature , which may be due to the copper nuclei is shielded , and the polarization of the ionic radius smaller phase- strain , resulting in dielectric constant and dielectric loss factor smaller due.
    It should be noted that , since the microwave heating characteristics of the material by the temperature control of the properties of materials , then, if the type of mineral origin , the nature of this or that there are differences ( in particular impurity content , types and internal defects , etc. ) , which will inevitably lead to Although the mineral with the same name , the microwave heating characteristics not - like , even very different . Pure natural minerals and chemically pure mineral to withstand microwave heating when there are big differences. Thus, the microwave heating of mineral properties , both universal regularity. Another particularity mineral itself , in the study , specific issues must be sub- bridges.