煤气化炉用热面砖和RF精炼炉用铬刚玉透气砖中铬价态变化的分析
Analysis of chromium valence state changes in refractory bricks for coal gasifiers and chrome corundum permeable bricks for RF refining furnace
姚晨臣1
作者信息
- 1. 洛阳利尔功能材料有限公司,洛阳 471300
- 折叠
摘要
除了采用X射线衍射分析(XRD)对含铬化合物的物相组成进行了表征外,还利用X射线光电能谱(XPS)和电感耦合等离子体发射光谱法(ICP)对煤气化炉用热面砖和RF精炼炉用铬刚玉透气砖中铬价态及其所含的水溶性六价铬含量进行测定分析.研究表明,RF精炼炉用铬刚玉透气砖在氧化气氛与碱金属氧化物(K2O、Na2O)或CaO高的侵蚀介质接触时,有六价铬化合物生成且含量较高,煤气化炉热面砖靠近工作面的层带中也存在Cr(Ⅲ)向Cr(Ⅵ)的转化,这一结果可能与煤气化炉中气氛变化有关.
Abstract
This article states the usage of X-ray diffraction analysis(XRD)to characterize the phase composition of chromium containing compounds,and the employment of X-ray photoelectron spectroscopy(XPS)and inductively coupled plasma-optical emission spectroscopy(ICP)to determine and analyze the chromium valence state and water-soluble hexavalent chromium content in refractory bricks for coal gasifier and chrome corundum permeable bricks for RF refining furnace.Research has shown that when chrome corundum permeable bricks for RF refining come into contact with high-erosion media containing alkali metal oxides(K2O,Na2O)or corrosive media with a high CaO content in an oxidizing atmosphere,hexavalent chromium compounds are generated in high amounts.There is also a conversion of Cr(Ⅲ)to Cr(Ⅵ)in the refractory brick layer near the hot working surface of the coal gasifier,which may be related to the changes in the atmosphere in the coal gasifier.
关键词
含铬耐火材料/三价铬/六价铬Key words
Chromium containing refractory materials/Trivalent chromium/Hexavalent chromium引用本文复制引用
出版年
2024
NETL
NSTL
万方数据