【作者】 杨小丽；

【导师】 雷明光；

【作者基本信息】 四川大学 ， 化工过程机械， 2005， 硕士

【摘要】 本文研究了絮凝剂对湿法磷酸料浆分离性能的影响,实验结果表明,絮凝剂可以显著的提高磷酸料浆的分离性能,对促进磷酸生产的发展具有巨大的推动作用。由于絮凝剂种类繁多,本文在总结前人工作的基础上,通过沉降实验优选出了适合该磷酸料浆的絮凝剂,然后重点研究了它对磷酸料浆过滤性能的影响。沉降实验装置采用的是一系列同样规格的量筒,过滤实验装置采用的是真空泵和真空布氏漏斗。实验所用料浆是根据不同的浓度进行配置的。采取正交试验,对影响磷酸料浆过滤性能的主要因素进行了实验研究。实验考虑的因素包括:过滤真空度、过滤温度、磷酸料浆浓度、絮凝剂加入量、絮凝搅拌强度和搅拌时间。本文实验结果为:与不加絮凝剂过滤相比较,加入絮凝剂可显著提高磷酸料浆的过滤强度达20%以上。影响磷酸料浆过滤性能的因素从主到次依次为:料浆浓度、絮凝剂加入量、过滤真空度、搅拌时间、过滤温度和搅拌强度。优化操作条件是:料浆浓度宜控制在400g/L 左右,过滤温度宜控制在80℃左右,过滤真空度宜控制在70KPa 左右,絮凝剂加入量宜控制在12ppm 左右,搅拌强度宜控制在150 s ?1,搅拌时间宜控制在120s 左右;对实验数据进行回归拟合,建立了磷酸料浆过滤速度的经验数学模型。本实验结果可用于湿法磷酸生产中料浆过滤设计和操作的理论依据,可用于磷酸工业生产的放大和优化。更多还原

【Abstract】 In this article, the effect that flocculation can have on the separation characters of phosphoric acid slurry via wet method was studied. The experiment results showed that flocculation can greatly improve the separation characters of phosphoric acid slurry via wet method, and also play an important role on promoting the production of phosphoric acid. Because of many kinds of flocculations, based on the others’studying results, adopting sedimentation experiment selected a kind of appropriate flocculation, it is adapatable to the experimental slurry. And then mainly studied its’effects to the filtration characters of phosphoric acid slurry via wet method. The sendimentation experiment equipment adopts a series of measuring cylinder with the same standard. The filtration experiment equipment adopts vacuum pump and filler. The slurries used in experiment were made in different concentrations of phosphoric acid. Using orthogonal tests, the primary factors, such as degree of vacuum, filtration temperature, concentration of phosphoric acid slurry, the quantities of floculation used, the stiring intensity and time, whose influene to the phosphoric acid slurry were studied. The experimental results of this article were gotten as follows: compared with the slurry that have not been added flocculation, adding flocculation can remarkably enhance the filtration characters of phosphoric acid slurry. The effection factors can range as follows: concentration of phosphoric acid slurry, the quantities of flocculation used, vacuum degree of filtration, stiring time, filtration temperature and stiring intenstity. The optimal operation conditions for filtration are indicated as follows: concentration of phosphoric acid slurry should be controlled at about 400g/l, the degree of vacuum filtration should be controlled at about 70kpa, the filtration temperature should be about 80 oC, the stiring intensity is about 150 s ?1, and the stiring time should be approximately 120 seconds. Regressing and fitting the experimental datum, the aim is to establish an empirical mathematical model for filtration rate of phosphoric acid slurry. These results can be functioned as the theoretical fundamentals for design and operation of slurry filtration in the manufacturing of wet-process phosphoric acid, and also can be applied in the amplification and optimization of industrial production of phosphoric acid.更多还原