电石渣动态煅烧及烧结过程的微观结构分析  

MICROSTRUCTURE CHANGE IN DYNAMIC CALCINATION AND SINTERING OF CARBIDE SLAG

作　　者：程军[1] 周俊虎[1] 刘建忠[1] 周志军[1] 曹欣玉[1] 岑可法[1] 

机构地区：[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　　处：《化工学报》2003年第7期984-988,共5页CIESC Journal

基　　金：国家重点基础研究发展规划项目(No G19990 2 2 2 0 4);国家高技术研究发展计划项目(No 2 0 0 2AA5 2 912 2 )~~

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 12 0 0℃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CaCO3 、α SiO2 和α Fe2 O3 晶相组成 ,高温煅烧后其主要晶相变成CaO .在 12 0 0℃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 .The microstructure change in the dynamic calcination and sintering of carbide slag was studied at a high temperature of 1200°C 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.

关 键 词：电石渣 煅烧 烧结 微观结构 

分 类 号：TK16[动力工程及工程热物理—热能工程] TQ038[化学工程]