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Composition and Structure of Calcium Aluminosilicate Microspheres

机译：硅铝酸钙微球的组成与结构

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The composition was studied of calcium aluminosilicate microspheres of three morphological types in high-calcium fly ash from combustion of brown coal from the Kansk-Achinsk basin in slag-tap boilers at temperatures from 1400 to 1500℃ and sampled in the first field of electrostatic precipitators at the Krasnoyarsk Cogeneration Power Station no. 2 (TETs-2). Gross compositions and the composition of local areas were determined using a scanning electron microscopy technique and an energy-dispersive analysis with full mapping of globules. With a high content of basic oxides O_(ox) (68 to 79 wt %) and a low content of acid oxides K_(ox) (21 to 31 wt %), type 1 microspheres are formed. They consist of heterogeneous areas having a porous structure and crystalline components in which the content of CaO, SiO_2, or Al_2O_3 differs by two to three times and the content of MgO differs by seven times. With a lower content of O_(ox) (55 to 63 wt %) and an elevated content of K_(ox) (37 to 45 wt %), type 2 microspheres are formed. They are more homogeneous in the composition and structure and consist of similar crystalline components. Having a close content of O_(ox) (46 to 53 wt %) and K_(ox) (47 to 54 wt %), type 3 microspheres, which are a dense matter consisting of amorphous substance with submicron- and nanostructure of crystalline components, are formed. The basic precursor in formation of high-calcium aluminosilicate microspheres is calcium from the organomineral matter of coals with various contribution of Mg, Fe, S, or Na from the coal organic matter and Al, Fe, S, or Si in the form of single mineral inclusions in a coal particle. On the basis of the available data, the effect was analyzed of the composition of a CaO-MgO-A1_2O_3-SiO_2-FeO system on the melting and viscous properties of the matter in microspheres and formation of globules of different morphology. The results of this analysis will help to find a correlation with properties of microspheres in their use as functional microaggregates in cement or polymeric composite materials, or in the production of ceramic membranes or zeolite sorbents.
机译：研究了Kansk-Achinsk盆地的褐煤在炉渣锅炉中于1400至1500℃的温度燃烧产生的高钙粉煤灰中三种形态类型的铝硅酸钙钙微球的组成，并在第一例静电除尘器领域进行了采样在克拉斯诺亚尔斯克热电联产电站2（TETs-2）。总成分和局部区域的成分是使用扫描电子显微镜技术和对球的完整映射进行的能量色散分析确定的。具有高含量的碱性氧化物O_（ox）（68至79 wt％）和低含量的酸性氧化物K_（ox）（21至31 wt％），形成了类型1微球。它们由具有多孔结构的异质区域和结晶成分组成，其中CaO，SiO_2或Al_2O_3的含量相差2到3倍，而MgO的含量相差7倍。以较低的O_（ox）（55至63 wt％）含量和较高的K_（ox）（37至45 wt％）含量，形成了类型2微球。它们的组成和结构更均一，由相似的晶体成分组成。具有紧密含量的O_（ox）（46至53 wt％）和K_（ox）（47至54 wt％）的3型微球，是由具有亚微米和晶体结构纳米成分的非晶态物质组成的致密物质， 形成。形成高钙硅铝酸盐微球的基本前体是煤炭有机矿物质中的钙，而煤有机物中的Mg，Fe，S或Na含量各不相同，而铝，Fe，S或Si则以单一形式存在。煤颗粒中的矿物包裹体。在现有数据的基础上，分析了CaO-MgO-Al2O_3-SiO_2-FeO体系的组成对其在微球中物质的熔融和黏性以及形成不同形态的小球的影响。该分析的结果将有助于发现微球在水泥或聚合物复合材料中用作功能性微骨料时的性能，或在陶瓷膜或沸石吸附剂生产中的相关性。

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