回转窑内结圈物特性分析
Characteristic analysis of ring-forming material in rotary kiln
甄彩玲 1梁功庆 1潘建 2朱德庆 2郭正启 2李思唯 2李会义 1周晓军1
作者信息
- 1. 武钢资源集团鄂州球团有限公司,湖北鄂州 436000
- 2. 中南大学资源加工与生物工程学院,湖南长沙 410083
- 折叠
摘要
回转窑结圈现象是限制回转窑制备氧化球团矿发展的重要因素.采用XRD和SEM-EDS分析回转窑氧化球团和结圈物的化学成分、显微结构、矿相组成及元素分布,以揭示结圈物形成机理.研究结果表明,结圈物主要为赤铁矿,其次为石英、钙铁橄榄石、钙镁橄榄石、长石等硅铝酸盐.球团矿产生的粉末及煤灰在高温下形成低熔点化合物,并形成液相渗入球团矿.液相中的赤铁矿在球团矿表面重结晶、再结晶,形成稳定的结圈物.通过改善配矿结构降低硅及碱金属含量、优化燃料资源质量减少低熔点物质的摄入、提高各工序操作条件来减少粉末的摄入,可有效抑制结圈现象.
Abstract
The phenomenon of ring-formation in rotary kilns is a crucial factor that impedes the development of oxi-dized pellets produced by rotary kiln.The chemical composition,microstructure,mineral phase composition and ele-ment distribution of oxidized pellets and ring-forming material in rotary kiln were analyzed by XRD and SEM-EDS to elucidate the formation mechanism of ring-forming material.The findings indicate that the primary ring-forming ma-terial is hematite,followed by quartz,calcium ferric olivine,calcium magnesium olivine,feldspar,and other silico a-luminate compounds.The powder generated by the pellets and coal ash forms low-melting-point compounds that liq-uefy at high temperatures and infiltrate into the pellets.The hematite in the liquid phase then re-crystallizes and ad-heres to the pellet surface,resulting in the formation of stable ring-forming material.By improving the ore blending structure to reduce the content of silicon and alkali metals,optimizing the quality of fuel resources to reduce the in-take of low-melting-point substances,and improving the operating conditions of each process to reduce the intake of powder,the ring-forming phenomenon can be effectively inhibited.
关键词
回转窑/结圈/煤灰/液相/再结晶Key words
rotary kiln/ring-formation/coal ash/liquid phase/recrystallization引用本文复制引用
基金项目
国家自然科学基金资助项目(52174329)
出版年
2024
NETL
NSTL
万方数据