不同气氛下流化床菱镁矿轻烧产物特性研究

doi:10.11949/0438-1157.20220428

摘要/Abstract

摘要：

利用实验室小型流化床装置，通过改变CO₂、H₂O浓度得到不同品位菱镁矿的轻烧产物，通过分解率、吸碘值、XRD、BET、SEM对轻烧产物的理化性质进行表征，研究了轻烧气氛中CO₂、H₂O含量对产物活性的影响。结果表明，在原料分解完全时，产物的活性由微观结构决定；增大CO₂浓度，轻烧产物的吸碘值逐渐降低，晶粒尺寸由小逐渐变大，表面结构由多孔变为少孔，说明CO₂的存在降低了产物活性；增大H₂O浓度，轻烧产物的吸碘值会逐渐降低，比表面积由大变小，表面结构由疏松多孔变得致密光滑，H₂O通过促进氧化镁的烧结来抑制产物的活性；相同工况下，高品位的菱镁矿轻烧产物活性高于低品位。

关键词: 流化床, 菱镁矿, 气氛, 活性, 轻烧

Abstract:

The light-burned products with different grades of magnesite are obtained by changing the concentrations of CO₂ and H₂O in a small fluidized bed. The physicochemical properties of the light-burned products are characterized by decomposition rate, iodine absorption value, XRD, BET and SEM. The effects of CO₂ and H₂O contents in the light-burned atmosphere on the activity of the products are studied. The results show that the activity of the product is determined by the microstructure when the raw material is completely decomposed. With the increase of CO₂ concentration, the iodine absorption value of light-burned products gradually decrease, the grain size gradually increase, and the surface structure changed from multiporous to less porous, indicating that the presence of CO₂ reduced the product activity. With the increase of H₂O concentration, the iodine absorption value of the light-burned products will gradually decrease, the specific surface area will decrease from large to small, and the surface structure will become dense and smooth from loose and porous. Under the same working conditions, the activity of light burning products of high grade magnesite is higher than that of low grade magnesite.

Key words: fluidized bed, magnesite, atmosphere, activity, light-burned

中图分类号:

TQ 026.7

王刚, 夏志豪, 李希艳, 张虹, 韩振南, 宋兴飞, 许光文. 不同气氛下流化床菱镁矿轻烧产物特性研究[J]. 化工学报, 2022, 73(8): 3699-3707.

Gang WANG, Zhihao XIA, Xiyan LI, Hong ZHANG, Zhennan HAN, Xingfei SONG, Guangwen XU. Effect of atmosphere on active performance of light-burned magnesium oxides from calcined magnesite in fluidized bed[J]. CIESC Journal, 2022, 73(8): 3699-3707.

图/表 13

表1 两种品位的菱镁矿原料化学组成

Table 1 Chemical composition of two grade magnesite raw materials

Compositions	Mass fraction/%
Compositions	High grade	Low grade
MgO	43.65	38.31
SiO₂	2.92	7.89
CaO	1.50	1.62
Al₂O₃	0.29	0.94
Fe₂O₃	0.28	0.51
others	0.22	0.35
LOI	51.14	50.38

图1 流化床实验台

Fig.1 Schematic diagram of the fluidized bed

图2 菱镁矿原料(a)和轻烧产物(b)热重分析结果

Fig.2 Thermogravimetric analysis of raw materials (a) and light-burned products (b) of magnesite

图3 不同CO2气氛下不同品位菱镁矿轻烧产物吸碘值

Fig.3 Iodine absorption value of light-burned products of magnesite in different CO2 atmosphere

图4 不同CO2气氛下菱镁矿轻烧产物的分解率

Fig.4 Decomposition rate of light-burned products of magnesite in different CO2 atmosphere

图5 不同CO2气氛下高品位(a)、低品位(b)菱镁矿轻烧产物XRD分析

Fig.5 XRD analysis of light-burned products of high grade (a) and low grade (b) magnesite in different CO2 atmosphere

图6 不同CO2气氛下轻烧产物的晶粒尺寸和比表面积

Fig.6 Grain size and specific surface area of light-burned products of magnesite in different CO2 atmosphere

图7 不同CO2气氛下菱镁矿轻烧产物微观形貌SEM图（80000×）

Fig.7 SEM images of magnesite light-burned products in different CO2 atmosphere (80000 times)

图8 不同H2O气氛下不同品位菱镁矿轻烧产物吸碘值

Fig.8 Iodine absorption value of light-burned products of magnesite in different H2O atmosphere

图9 不同H2O气氛下不同品位菱镁矿轻烧产物分解率

Fig.9 Decomposition rate of light-burned products of magnesite in different H2O atmosphere

图10 不同H2O气氛下高品位(a)、低品位(b) 菱镁矿轻烧产物XRD分析

Fig.10 XRD analysis of light-burned products of high grade (a) and low grade (b) magnesite in different H2O atmosphere

图11 不同H2O气氛下不同品位菱镁矿轻烧产物比表面积

Fig.11 Specific surface area of light-burned products of different grades magnesite in different H2O atmosphere

图12 不同H2O气氛下菱镁矿轻烧产物微观形貌SEM图（80000×）

Fig.12 SEM images of magnesite light-burned products in different H2Oatmosphere (80000 times)

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