蚀刻用氯化铁废液资源化绿色再生工艺及其装备研究

发布时间：2018-04-01 11:15

本文选题：蚀刻废液　切入点：资源回收　出处：《华东理工大学》2017年硕士论文

【摘要】：含铜FeCl_3蚀刻废液的资源化再生工艺过程主要包括CuCl_2的结晶过程、晶体的分离过程以及Fe2+离子的氧化过程,但目前的工艺过程及其装备在晶体分离环节具有开放式、在蒸发加热环节具有大流量等特征,造成对环境的热污染和粉体污染,致使结晶晶体粒径分散带宽,晶体表面携带污染物多等问题。针对现有工艺装备的不足,本论文展开如下研究:(1)对原有工艺进行再造,嵌入旋流分级浓缩子系统,返回晶种提高晶粒的单分散性,蒸发母液实行封闭循环加热,抑制对环境的污染,同时提高回收产品的质量。(2)从结晶动力学的角度,分析了氯化铜晶体成核及其生长速率方程;通过结晶实验,研究了蒸发温度、搅拌速率、真空度以及停留时间对CuCl_2晶体生长的影响,为处理工艺提供了操作依据。(3)根据新工艺对现有装备进行改造,通过FLUENT软件数值模拟与现场调试等方式,优化了晶体提取与晶种返回子系统的装备结构及其操作参数。(4)通过对新工艺装备的现场调试,确定了晶种分级子系统的最佳进口压力为0.25MPa,最佳进料浓度为10%。工业化运行结果表明:CuCl_2晶体产品中粒径大于65μm的含量为92.6%,纯度由95%提高到98%,离心机处理量降低了 96%。
[Abstract]:The regeneration process of copper containing FeCl_3 etching waste liquid mainly includes the crystallization process of CuCl_2, the separation process of crystal and the oxidation process of Fe2 ion. However, the current process and equipment are open in the process of crystal separation. The evaporation heating has the characteristics of large flow rate, resulting in thermal pollution and powder pollution to the environment, resulting in dispersed bandwidth of crystal size and many pollutants carried on the crystal surface, etc. In view of the shortage of existing technology and equipment, and so on, The research in this paper is as follows: (1) reengineering the original process, embedding the swirl fractionated concentration subsystem, returning the seed to improve the monodispersity of the grain, evaporating the mother liquor by closed circulation heating, and restraining the pollution to the environment. From the point of view of crystallization kinetics, the nucleation and growth rate equation of copper chloride crystal were analyzed, and the evaporation temperature and stirring rate were studied by crystallization experiment. The effect of vacuum and residence time on the growth of CuCl_2 crystal provides the operating basis for the treatment process. The equipment structure and operation parameters of the crystal extraction and seed return subsystem are optimized. The optimum inlet pressure of seed grading subsystem is 0.25 MPA and the optimum feed concentration is 10. The industrial operation results show that the content of grain diameter > 65 渭 m in the crystal product is 92.6%, the purity is increased from 95% to 98%, and the processing capacity of centrifuge is reduced by 96%.
【学位授予单位】：华东理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X76;TQ131.21

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