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Microwave heating process of drying tannins germanium acid

Author: SuBin
Tutor: PengJinHui
School: Kunming University of Science and Technology
Course: Non-ferrous metallurgy
Keywords: Single- Ning Shen germanium Microwave Drying Microwave heating - natural evaporation drying Dynamics Response Surface
CLC: TF802.64
Type: Master's thesis
Year: 2009
Downloads: 35
Quote: 0
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Abstract

This article describes the nature and purpose of the germanium. Comparison of infrared heating and drying, dried fuel heating and microwave heating drying characteristics, reflects the microwave heating drying superiority. Discusses the application of microwave heating in the field of domestic and international metallurgical. Drying, microwave heating and drying by conventional electric heating, microwave heating - natural evaporated to dryness three methods for the dehydration process of the adhesive material tannin Shen germanium conducted research. The following conclusions: (1) In the conventional electric heating and drying, the tannin Shen germanium relative dehydration rate is increased with increasing drying temperature; increased with the holding time; decrease with the increase in the mass of material , but to reduce the trend of more and more slowly. The optimum parameters: drying temperature of 120 ° C, holding time 170min, material weight 10g, tannin Shen germanium relative dehydration was 98.69%. (2) In a microwave heating and drying, the tannin Shen germanium relative dehydration rate increase as the drying temperature increases; increased with the holding time; decrease with the increase in the mass of material, and this decline The trend is increasingly small. The best under the conditions of the experimental process parameters: drying temperature of 90 ° C, the holding time of 8min materials weight 10g, tannic, Shen germanium relative dehydration rate of 97.33%. (3) using the microwave heating - natural evaporation drying tannin Shen germanium this method, relatively dehydrated first increasing temperature increases, continue to heat up substantially no change in relative dehydration rate; within a certain time range, the relative dehydration rate with the insulation The extension of time increases; relative dehydration rate decreases with the increase in the weight of the material, and reduces the trend flatten. The best under the conditions of the experimental process parameters: drying temperature of 80 ° C, the holding time of 6min materials weight 10g, the tannins Shen germanium, the relative rate of dehydration, 98.73%. (4) for the material of the adhesive properties, microwave heating drying advantages: reducing the drying temperature, and shorten the holding time. Microwave heating - natural evaporation drying advantage: shorten the time of microwave irradiation on materials, relative dehydration rate, saving energy consumption. (5) of the conventional electric heating, microwave heating - natural evaporation drying tannins Shen germanium experiment analysis, derived dynamics under different drying methods exponential model MR = exp (-ktn) for further research tannins Shen germanium drying mechanism laid a theoretical foundation. (6) by Design-Expert7 software to optimize the experimental results of microwave heating and drying, microwave heating - natural evaporative drying, draw the two methods of drying model to predict the optimum conditions of the experiment. SEM microscopic structure diagram (7) is heated and dried by a conventional electric and microwave heating after drying, the morphological changes of the material shows that: microwave heating after drying the porosity of the material structure of the more, the larger, more porous, and the lower hardness, is conducive to fully calcined , may improve the recovery of germanium. Shows that microwave heating - can play not only the natural evaporation of the drying tannins Shen germanium microwave heating and drying selective heating, rapid warming, energy saving advantages, but also to take advantage of the microwave heating stop waste heat, moisture exclusion. Therefore, microwave heating - natural evaporation of the the dry tannins Shen germanium is a highly efficient, energy-saving, economically viable drying new technology.

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CLC: > Industrial Technology > Metallurgical Industry > Nonferrous metal smelting > General issues > Raw materials and its preparation > Preparation of > Heating, drying
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