Passed the ISO9001 quality system certification and the establishment of industrial drying industry alliance standards under the guidance of the Chinese Standardization Research Institute.
- May 08, 2019 -
microwave field can be solved by microwave technology and equipment. The drying time can be shortened and drying rate and productivity can be improved at a low temperature. Microwave-assisted acidification of phosphate rock to produce calcium phosphate rock has been studied. The results show that microwave-assisted acidification can increase the temperature of phosphate rock pulp, change the crystalline morphology, promote the reaction and increase the conversion rate. The author is engaged in the research of microwave drying process of chemical fertilizer, and intends to find out the relationship between microwave and granulation performance of high nitrogen compound fertilizer through experiments, and determine the optimum technological conditions of microwave drying of compound fertilizer and its mechanism of mass and heat transfer. Preliminary experiments show that the temperature of fertilizer increases very slowly under the action of microwave, heating in microwave oven for 40 minutes does not exceed 50 C, while under the same conditions, the temperature of water heating in microwave oven for 5 minutes can reach 80 C, and the quality can be reduced by 70%. This is because the dielectric constant of general fertilizers is much smaller than that of water, such as urea 3.5, potassium chloride 5.03 and ammonium chloride 7.0. The different effects of microwave on fertilizer and water are the theoretical basis of microwave drying compound fertilizer.
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