赤铁矿磁化焙烧过程中生物质热解气化特性研究  

Study on Characteristics of Biomass Pyrolysis Gasification During Magnetization Roasting of Hematite

作　　者：晋国杰 孙永升[1] 曹越 JIN Guojie;SUN Yongsheng;CAO Yue(School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819

出　　处：《矿产保护与利用》2023年第3期67-74,共8页Conservation and Utilization of Mineral Resources

基　　金：国家自然科学基金资助项目(52022019)。

摘　　要：磁化焙烧工艺是处理复杂难选铁矿石有效的途径之一,但其生产过程中需要能源和还原剂,而生物质作为一种清洁能源,可热解出CO、CO_(2)、CH_(4)和H_(2),其中的CO、CH_(4)和H_(2)可在铁矿石磁化焙烧的过程中作为还原剂使用,实现清洁生产。以玉米秸秆和赤铁矿为原料,研究了在磁化焙烧过程中秸秆型生物质的热解气化特性。利用气体成分分析仪和TG-FTIR,分析了不同条件下秸秆的裂解产物。气体成分分析结果表明,在焙烧温度700℃、N_(2)流量300 mL/min和秸秆与赤铁矿质量配比1∶3的磁化焙烧条件下,CO_(x)的生成量达到了最大,为277.45 mL,此时秸秆热解效果最佳。TG-FTIR分析结果表明,赤铁矿的存在未改变秸秆热解产物的种类,但改变了产物的释放特性和生成量;在800℃以上的磁化焙烧过程中,DTG曲线出现了第二个失重峰,说明磁化焙烧过程中秸秆热解的反应速率大大加快。The magnetization roasting process is one of the effective ways to treat complex and refractory iron ores.However,energy and reducing agents are required during its production process.As a clean energy source,biomass can be thermally decomposed to produce CO,CO_(2),CH_(4),and H_(2),among which CO,CH_(4),and H_(2) can be used as reducing agents in the magnetization roasting process of iron ore,achieving clean production.Using corn straw and hematite as raw materials,the thermal decomposition and gasification characteristics of straw biomass were investigated during magnetization roasting.Gas composition analysis results showed that under the magnetization roasting conditions of 700℃,N_(2) flow rate of 300 mL/min,and straw-hematite mass ratio of 1∶3,the maximum production of COx reached 277.45 mL,indicating the optimal thermal decomposition effect of straw.TG−FTIR analysis results showed that hematite did not change the type of straw pyrolysis products,but altered the release characteristics and production of the products.In the magnetization roasting process above 800℃,the DTG curve exhibited a second weight loss peak,indicating a significant increase in the reaction rate of straw thermal decomposition during magnetization roasting.

关 键 词：赤铁矿 玉米秸秆 磁化焙烧 热解气化 TG-FTIR 气体成分分析仪 

分 类 号：TD951.1[矿业工程—选矿] TD925.7