含锌固废高效资源化回收试验与数值模拟

Efficient resource recovery test and numerical simulation of zinc-containing solid waste

回转窑工艺被广泛应用于含锌固废的资源化处置,为进一步优化工艺,本文在对比高低Cl元素夹杂的两类含锌固废回转窑入炉料、尾渣和再生锌粉的成分、物相等特征的基础上,分析了回转窑的反应过程,并采用CFD数值模拟Zn、Pb蒸汽的运动路径。研究发现:两类含锌固废实际生产Pb、Zn的脱除率分别为83.33%、67.69%和96.97%、84.38%,再生Zn粉纯度分别为14.58%和41.49%,Cl的脱除率分别为96.64%和97.97%;数值模拟中,当通气速率为10 m/s,绝热壁面温度为1200℃时,可实现Pb、Zn和含Fe窑渣的梯级分离,该方案有助于提升再生产品纯度,增加含锌固废的回收价值。

Rotary kiln process is widely used in the resource disposal of zinc-containing solid waste.In order to optimize the technique,in this paper,based on comparing and studying the composition and phase of incoming charge,tailings and recycled zinc powder of two enterprises,the reaction process of rotary kiln is analyzed.The results show that the removal rates of Pb and Zn produced from two kinds of inc-containing wastes are 83.33%,67.69%,96.97%and 84.38%respectively,the grades of purity of regenerated zinc powder are 14.58%and 41.49%respectively,the removal rates of Cl are 96.64%and 97.97%respectively.In numerical simulation,when the ventilation rate is 10 m/s and the temperature of insulated wall is 1200 C,the step separation of Pb,Zn and Fe-containing kiln slag can be realized.This method is conducive to improve the purity of regenerated products and enhance the value of zinc-containing solid waste.