Study on Characteristics of Biomass Pyrolysis Gasification During Magnetization Roasting of Hematite
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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、CO2、CH4和H2，其中的CO、CH4和H2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 ℃、N2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，COx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。
Abstract: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, CO2, CH4, and H2, among which CO, CH4, and H2 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 ℃, N2 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.
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Key words:
- hematite /
- corn straw /
- magnetization roasting /
- pyrolysis gasification /
- TG-FTIR /
- gas analyzer
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表 1 赤铁矿化学成分分析结果
Table 1. Chemical composition analysis results of the samples
成分 TFe FeO SiO2 Al2O3 CaO MgO Mn TiO2 S P 含量/% 67.34 0.88 0.80 0.38 0.05 0.24 0.13 0.047 <0.01 0.04 
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表 2 赤铁矿铁物相分析结果
Table 2. Iron phase analysis results of the samples
铁物相 磁性铁
中铁碳酸铁
中铁赤铁矿
中铁硫化铁
中铁硅酸铁
中铁全铁 含量/% 1.80 0.06 64.93 0.08 0.67 67.54 分布率/% 2.67 0.08 96.13 0.12 0.09 100.00
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表 3 秸秆成分分析结果
Table 3. Results of industrial analysis of straw
水分/% 灰分/% 挥发分/% 固定碳/% 热值/(kJ·g−1) 5.57 1.37 77.52 15.54 16.84
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表 4 秸秆元素分析结果
Table 4. Results of elemental analysis of straw
元素 C H O N P S 含量/% 41.82 5.60 48.6 1.25 0.034 0.07
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表 5 秸秆组分分析结果
Table 5. Results of composition analysis of straw
组分 纤维素 半纤维素 木质素 其他 含量/% 40.91 28.57 5.48 24.92
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