生物质还原气对赤铁矿悬浮磁化焙烧的温度影响
Effect of temperature on suspension magnetization roasting of hematite using biomass waste as reductant:A perspective of gas evolution
曹越 1孙永升 1韩跃新 1高鹏 1李艳军1
作者信息
- 1. School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China;National-local Joint Engineering Research Center of High-efficient Exploitation Technology for Refractory Iron Ore Resources,Shenyang 110819,China
- 折叠
摘要
为了实现生物质废料的清洁利用,本文以生物质废料为焙烧还原剂,进行了不同温度下的赤铁矿焙烧试验.利用了TG-FTIR,Py-GC/MS和气体成分分析等检测方法,表征了磁化焙烧过程中不同温度下的气体演变行为.热重结果表明该焙烧过程主要分为脱除自由水阶段、生物质挥发分逸出阶段、磁化还原阶段以及过还原阶段.当焙烧温度在200-450℃时,主要的逸出产物为CO2、酸类和酮类;随着焙烧温度升高至900℃时,CO、H2和CH4小分子还原气体浓度不断增加至13.09%,14.38%和10.03%.在最佳焙烧温度700℃时,可得到铁精矿品位70.86%、回收率98.66%、磁性转化率45.70%的焙烧产品,此时CO、H2和CH4的气体浓度分别为8.91%、8.90%和4.91%.本文确定了最佳焙烧温度为700℃,揭示了低温下逸出气体主要以CO2及有机气体分子形式存在,表明了焙烧温度的升高利于小分子还原性气体CO、CH4和H2的生成,为生物质废料还原赤铁矿的清洁利用提供了新的思路.
Abstract
The magnetization reduction of hematite using biomass waste can effectively utilize waste and reduce CO2 emission to achieve the goals of carbon peaking and carbon neutrality.The effects of temperatures on suspension magnetization roasting of hematite using biomass waste for evolved gases have been investigated using TG-FTIR,Py-GC/MS and gas composition analyzer.The mixture reduction process is divided into four stages.In the temperature range of 200-450℃for mixture,the release of CO2,acids,and ketones is dominated in gases products.The yield and concentration of small molecules reducing gases increase when the temperature increases from 450 to 900℃.At 700℃,the volume concentrations of CO,H2 and CH4 peak at 8.91%,8.90%and 4.91%,respectively.During the suspension magnetization roasting process,an optimal iron concentrate with an iron grade of 70.86%,a recovery of 98.66%and a magnetic conversion of 45.70%is obtained at 700℃.Therefore,the magnetization reduction could react greatly in the temperature range of 600 to 700℃owing to the suitable reducing gases.This study shows a detail gaseous evolution of roasting temperature and provides a new insight for studying the reduction process of hematite using biomass waste.
关键词
悬浮磁化焙烧/生物质裂解/气体演变/还原行为Key words
suspension magnetization roasting/biomass pyrolysis/gases evolution/reduction behavior引用本文复制引用
基金项目
National Natural Science Foundation of China(52022019)
出版年
2024
NETL
NSTL
万方数据