Microwave Heating And Drying Tannins Germanium Acid Process Research

The properties and the application of germanium is introduced, a comparison of characteristics of infrared dehydration, fuel heating dehydration and microwave heating dehydration is made, the advantage of the microwave heating dehydration is proposed and the application in national and international metallurgy field is discussed. Three methods including conventional electric heating dehydration, microwave heating dehydration and microwave heating-natural evaporation dehydration, are taken to study the relative dehydrationrate of cohesive material-tannins germanium acid。(1)When dehydrated by conventional electric heating, the relative dehydrationrate of tannins germanium acid increases along with the increase of the dehydrated temperature. The relative dehydrationrate increases along with the increase of the holding time. The relative dehydrationrate decreases along with the increases of material weight, but tends to flat. The recommended technological parameters are as follows:the dehydrated temperature is 120℃, the holding time is 170min, the material weight is lOg and the relative dehydrationrate of tannins germanium acid is 98.69%.(2)In microwave heating, the relative dehydrationrate of tannins germanium acid increases along with the increase of the dehydrated temperature. The relative dehydrationrate increases along with the increase of the holding time. The relative dehydrationrate decreases along with the increases of material weight, but tends to mininum. The recommended technological parameters are as follows:the dehydrated temperature is 90℃, the holding time is 8min, the material weight is 10g and the relative dehydrationrate of tannins germanium acid is 97.33%.(3)By microwave heating-natural evaporation, the relative dehydrate-onrate of tannins germanium acid increases along with the increase of the dehydrated temperature. When the temperature reaches a given value, the temperature's increasing has no obvious effect on relative dehydrationrate. In a given period, the relative dehydrationrate increases with the increase of treating time. The relative dehydrationrate decreases along with the increases of material weight, but tends to flat. The recommended technological parameters are as follows:the dehydrated temperature is 80℃, the holding time is 6min, the material weight is lOg and the relative dehydrationrate of tannins germanium acid is 98.73%.(4) For cohesive material, microwave heating dehydration reduces the temperature for a large scale and shortens the reaction period comparing with the conventional electric heating dehydration. Microwave heating-natural evaporation dehydration shortens the time that microwave takes effect on the material, which saves energy.(5)A kinetic exponential model MR=exp(-ktn)in different dehydrate-ions is developed by analyzing the experimentations tannins germanium acid heated by conventional electricity and microwave heating-natural evaporation dehydration.(6) The experiment results of microwave heating dehydration and microwave heating-natural evaporation dehydration are optimized by adopting the Design-Expert7 software and the development of dehydration models of these two methods.(7) It can be seen from the SEM analysis by comparing conventional electric heating dehydration with microwave heating dehydration and the change of configuration materials that the material processed with the latter method gets much more and much larger structural pores, more loosen and less hardness which makes it easy to calcine and raises the recovery of germanium.It can be concluded that microwave heating-natural evaporation dehyd-ration not only shows its advantages on selectively heating, temperature rising rapidly and energy saving but also utilize the excess heat to eliminate moisture further. Therefore, microwave heating-natural evaporation dehydrating tannins germanium acid is an efficient, energy-saving and economically feasible new dehydration technics.