微波干燥湿法炼锌中和铁渣实验研究

doi:10.16085/j.issn.1000-6613.2020-1550

化工进展 ›› 2021, Vol. 40 ›› Issue (2): 1077-1084.DOI: 10.16085/j.issn.1000-6613.2020-1550

微波干燥湿法炼锌中和铁渣实验研究

马爱元¹^,²(), 郑雪梅¹^,²(), 袁杰¹^,²

^1.六盘水师范学院化学与材料工程学院，贵州六盘水 553004
^2.贵州省煤炭洁净利用重点实验室，贵州六盘水 553004

收稿日期:2020-08-05 修回日期:2020-09-21 出版日期:2021-02-05 发布日期:2021-02-09
通讯作者: 郑雪梅
作者简介:马爱元（1988—），男，博士，副教授，主要研究方向为冶金固体废弃物资源综合利用。E-mail：may_kmust11@163.com。
基金资助:
贵州省科技厅技术基金(黔科合基础[2019]1444);贵州省教育厅科技拔尖人才支持项目(黔教合KY字[2018]066);六盘水市科技计划(52020-2018-0304);六盘水师范学院科技创新团队项目(LPSSYKJTD201801);六盘水师范学院重点学科建设项目(LPSSYZDPYXK201708);贵州省科技平台及人才计划(黔科合平台人才[2020]2001)

Experimental study on the microwave drying of neutralization iron slag from zinc hydrometallurgy

Aiyuan MA¹^,²(), Xuemei ZHENG¹^,²(), Jie YUAN¹^,²

^1.School of Chemistry and Materials Engineering, Liupanshui Normol University, Liupanshui 553004, Guizhou, China
^2.Guizhou Provincial Key Laboratory of Coal Clean Utilization, Liupanshui 553004, Guizhou, China

Received:2020-08-05 Revised:2020-09-21 Online:2021-02-05 Published:2021-02-09
Contact: Xuemei ZHENG

摘要/Abstract

摘要：

湿法炼锌产出的中和沉铁渣作为重要的二次资源，含有大量的铁、锰、锌等有价金属，具有较高的综合回收利用价值。回收有价金属前需对中和铁渣进行脱水预处理，基于回转窑干燥法存在干燥时间长、干燥效率低、二次污染等问题，本文开展了微波干燥湿法炼锌中和铁渣实验研究，考察了微波功率、物料量对中和铁渣温升行为的影响，表明微波干燥湿法炼锌中和铁渣是可行的；实验考察了微波功率、物料量和干燥时间对中和铁渣脱水率的影响。研究结果表明：在一定程度上，中和铁渣脱水率与干燥时间和微波功率成正比，与物料量成反比。实验控制微波功率为1000W、物料量为50g、微波干燥时间为9min时，中和铁渣脱水率达98.55 %；X射线衍射、红外光谱分析展示微波干燥中和铁渣自由水脱除较为完全，但仍含有部分的结晶水；扫描电镜分析显示微波干燥较常规干燥更为均匀；与常规干燥工艺相比，微波干燥具有干燥时间短、水脱除率高、干燥均匀、清洁无污染等优势。

关键词: 中和铁渣, 微波, 干燥, 脱水率

Abstract:

As an important secondary resource, neutralizing iron slag in zinc hydrometallurgy contains a lot of valuable metals such as iron, ferrum and zinc, which has a high value of comprehensive recovery and utilization. Before the recovery of valuable metals, the neutralizing iron slag needs to be dehydrated and pretreated. Based on the problems of long drying time, low drying efficiency and secondary pollution in the rotary kiln drying method, the experimental research on the neutralizing iron slag in zinc hydrometallurgy by microwave drying was carried out. The experimental study on the influence of microwave power and material quantity on the temperature rise behavior of neutralizing iron slag showed that it is feasible to dry the neutralizing iron slag in zinc hydrometallurgy by microwave drying. The effects of microwave power, material quantity and drying time on the dehydration rate of neutralizing iron slag were investigated. The results showed that, to some extent, the dehydration rate of neutralizing iron slag is directly proportional to drying time and microwave power, and inversely proportional to the amount of material. When the microwave power is 1000W, the material quantity is 50g and the microwave drying time is 9min, the dehydration rate of neutralizing iron slag is 98.55%. XRD and FTIR analysis showed that the iron slag was completely removed in microwave drying. SEM analysis showed that microwave drying was more uniform than conventional drying. Compared with the conventional drying process, microwave drying has the advantages of short drying time, high water removal rate, drying uniform, clean and pollution-free.

Key words: neutralization iron slag, microwave, drying, dehydration rate

中图分类号:

TF813

马爱元, 郑雪梅, 袁杰. 微波干燥湿法炼锌中和铁渣实验研究[J]. 化工进展, 2021, 40(2): 1077-1084.

Aiyuan MA, Xuemei ZHENG, Jie YUAN. Experimental study on the microwave drying of neutralization iron slag from zinc hydrometallurgy[J]. Chemical Industry and Engineering Progress, 2021, 40(2): 1077-1084.

图/表 12

表1 样品的主要元素成分

成分	质量分数/%	成分	质量分数/%
Zn	10.63	Fe	20.70
Ca	19.11	Mn	0.71
Mg	1.96	S	24.78

图1 中和沉铁渣样品XRD谱图

图2 中和沉铁渣样品SEM-EDS谱图

图3 不同微波功率下中和铁渣的升温速率曲线

图4 不同中和铁渣物料量在微波场中的升温速率曲线

图5 不同物料量下干燥时间对脱水率的影响

图6 不同干燥温度下干燥时间对中和铁渣脱水率的影响

图7 不微波功率对中和铁渣脱水率的影响

图8 物料量对中和铁渣脱水率的影响

图9 常规与微波干燥后样品的XRD谱图分析

图10 干燥前后样品的红外光谱

图11 不同干燥方式下中和铁渣样品SEM图

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微波干燥湿法炼锌中和铁渣实验研究

Experimental study on the microwave drying of neutralization iron slag from zinc hydrometallurgy

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