微波强化中和铅锌冶炼渣干燥机制研究
Study on drying mechanism of microwave-enhanced neutralized lead-zinc smelting slag
张朝波 1杨坤 2尹为波 1付光 1张特1
作者信息
- 1. 云南驰宏锌锗股份有限公司,云南 曲靖 655011
- 2. 昆明理工大学 冶金与能源工程学院,云南 昆明 650093
- 折叠
摘要
针对现行铅锌冶炼渣干燥周期长、过程污染大等问题,本文提出微波强化干燥新工艺,在分析原料物性状态的基础上,对中和铅锌冶炼渣高温介电及微波干燥影响因素进行分析,明确了微波强化中和铅锌冶炼渣干燥过程机制.结果表明,中和铅锌冶炼渣中含有结晶水的物相为CaSO4·0.5H2O,自由水含量为30.2%,结晶水含量为7.2%,自由水与结晶水的吸波性能相似,且明显优于渣中其他物相;在粒径8 cm、厚度2.2 cm、微波功率700 W、干燥时间 15 min条件下,微波干燥中和铅锌冶炼渣效果最优,自由水完全去除,结晶水去除率达到53.06%,总失水率为 34.02%;微波干燥中和铅锌冶炼渣时,会引起中和铅锌冶炼渣的破裂分层,有助于实现快速高效干燥;相较常规干燥,微波干燥1kg中和铅锌冶炼渣节约能耗16.98%(630 kJ),比常规多脱除5.40%的水分,干燥时间缩短 87.5%.本论文所建立中和铅锌冶炼渣干燥技术具有明显优势.
Abstract
Aiming at the problems of long drying cycle and large process pollution of the current lead-zinc smelting slag,this paper proposes a new technology of microwave enhanced drying.On the basis of analyzing the physical properties of the raw materials,the high temperature dielectric and microwave drying factors of the neutralized lead-zinc smelting slag were analyzed,and the drying process mechanism of the microwave-enhanced neutralized lead-zinc smelting slag was clarified.The results show that the phase containing crystal water in the neutralized slag is CaSO4·0.5H2O,the content of free water is 30.2%,and the content of crystal water is 7.2%.The wave-absorbing properties of free water and crystal water are similar,and obviously superior to other phases in slag.Under the conditions of particle size 8 cm,thickness 2.2 cm,microwave power 700 W,and drying time 15 min,microwave drying has the best effect of neutralized lead-zinc smelting slag,free water is completely removed,the removal rate of crystal water reaches 53.06%,and the total water loss rate is 34.02%.When the neutralized lead-zinc smelting slag is dried by microwave,it will cause cracking and stratification of the neutralized slag,which helps to achieve fast and efficient drying.Compared with conventional drying,microwave drying 1 kg neutralized lead-zinc smelting slag saves energy by 16.98%(630 kJ),removes 5.40%more water than conventional drying,and shortens drying time by 87.5%.The drying technology of neutralizing lead-zinc smelting slag established in this paper has obvious advantages.
关键词
中和铅锌冶炼渣/微波/介电特性/干燥机制/吸波性能/脱水Key words
neutralized lead-zinc smelting slag/microwave/dielectric properties/drying mechanism/wave absorbing property/water removal引用本文复制引用
基金项目
国家重点研发计划课题(2019YFC1904204)
出版年
2024
NETL
NSTL
维普
万方数据