化工学报 ›› 2003, Vol. 54 ›› Issue (7): 984-988.

• 能源和环境工程 • 上一篇    下一篇

电石渣动态煅烧及烧结过程的微观结构分析

程军;周俊虎;刘建忠;周志军;曹欣玉;岑可法   

  1. 浙江大学能源洁净利用与环境工程教育部重点实验室,浙江 杭州 310027
  • 出版日期:2003-07-25 发布日期:2003-07-25

MICROSTRUCTURE CHANGE IN DYNAMIC CALCINATION AND SINTERING OF CARBIDE SLAG

CHENG Jun;ZHOU Junhu;LIU Jianzhong;ZHOU Zhijun;CAO Xinyu;CEN Kefa   

  • Online:2003-07-25 Published:2003-07-25

摘要: 利用管式电炉、X射线衍射仪、压汞仪和SEM扫描电镜研究了电石渣在1200℃高温下动态煅烧及烧结过程中的微观结构变化.发现电石渣主要由含量大于80%的Ca (OH)2以及少量CaCO3α-SiO2α-Fe2O3晶相组成,高温煅烧后其主要晶相变成CaO.在1200℃下煅烧及烧结过程中,随时间增加电石渣的平均孔径逐渐增大,比表面积逐渐减少,总孔容积先增大后减少.高温长时间烧结后,电石渣表面由许多膨胀变形的类哑铃形CaO晶粒结构组成,且大小均匀、排列有序、边界明显.

关键词: 电石渣, 煅烧, 烧结, 微观结构

Abstract: The microstructure change in the dynamic calcination and sintering of carbide slag is studied at a high temperature of 1200℃ on a tubular electric furnace with X-ray powder diffractometer,mercury intrusion porosimeter and scanning electronic microscope(SEM). It is found that the main crystal composition of raw carbide slag, Ca (OH)2, turns to CaO after calcination at a high temperature. The mean pore diameter of carbide slag increases and the specific surface area decreases all along with increasing experimental time, while the total pore volume firstly increases and then decreases. After intense sintering, the surface of carbide slag is composed of many swelled dumbbell-like CaO particles,similar in particle diameters and arrayed in order.

Key words: 电石渣, 煅烧, 烧结, 微观结构