典型农药废盐热处理过程动力学特征

为了探究农药废盐热处理适宜性，采用热重分析法结合动力学模型分别对3种典型农药废盐--咪鲜胺、烟嘧磺隆和草甘膦废盐进行研究.试验结果表明咪鲜胺废盐仅有一个明显失重阶段，温度高于600℃后质量基本不发生变化，烟嘧磺隆和草甘膦废盐有两个明显失重阶段，温度分别高于300℃和450℃后失重速率明显变缓，三种废盐的明显失重温度和减重率均不相同，说明不同类型废盐的热解/燃烧特性存在明显差异；3种废盐各自的燃烧和热解的失重过程均较为相似，说明氧气的存在不会对热处理过程产生影响.并结合热处理动力学参数可知，废盐的热处理是复杂的反应过程，烟嘧磺隆废盐燃烧和热解所需活化能相近为0.297~5.894kJ/mol，热处理过程最容易发生，咪鲜胺和草甘膦废盐燃烧的活化能低于热解活化能，说明氧气会促进咪鲜胺和草甘膦废盐的热处理过程，废盐的热处理在空气气氛下即可.

Thermal degradation kinetic property of waste salt during thermal treatment

To explore the suitability of thermal treatment of pesticide waste salt, three typical pesticide waste salt, prochloraz, nicosulfuron and glyphosate, were studies by thermogravimetric analysis and kinetic model. The experimental result indicated prochloraz waste salt had a significant weightlessness phase, and its weight maintained constant basically after the temperature was higher than 600℃. Nicosulfuron and glyphosate wast salt had two significant weightlessness phase, and the rate of weight loss was significantly slower at temperatures above 300℃ and 450℃, respectively. The weightlessness processes of the combustion and pyrolysis of three types of waste salt were similar, which indicated that the existence of oxygen would not affect the thermal treatment process. Moreover, combined with the thermal treatment kinetic parameter, the thermal treatment of waste salt was complex reaction processes. The activation energy required for the combustion and pyrolysis of the nicosulfuron waste salt was similar to that of 0.297~5.894kJ/mol. And the thermal treatment of the nicosulfuron waste salt was most likely to occur. The activation energy of the combustion of prochloraz and glyphosate waste salt was lower than pyrolysis activation energy, indicating that oxygen could promote the thermal treatment of prochloraz and glyphosate waste salt. The thermal treatment would be in the air atmosphere.