酸洗对桦甸油页岩矿物质以及有机结构的影响

基于FT-IR和XRD技术研究了逐级酸洗对桦甸油页岩矿物质以及有机结构的影响。结果表明,采用HCl/HF酸洗方法可以有效去除黄铁矿以外的矿物质,但盐酸处理破坏油页岩中高岭石的立体框架结构。油页岩中有机质以脂肪族结构为主,存在形式为无序非晶态聚合体且变质程度较低。酸洗处理对油页岩有机大分子结构影响很小,但对有机结构产生了一定的影响。盐酸处理主要影响含氧官能团和苯环结构,会生成大量羧酸并破坏苯环的多环结构,但对脂肪族化合物的影响较小。氢氟酸处理主要对脂肪族化合物产生影响,破坏脂肪链的桥键结构,脂肪链断裂变短,进而使样品中脂肪族化合物含量降低。盐酸和氢氟酸处理均会破坏油页岩的羟基官能团,尤其对自缔合羟基氢键影响最大。

Influence of demineralization on minerals and organic structure in Huadian oil shale

Effect of demineralization on minerals and organic structure of Huadian oil shale treated by HCl and HF/HCl sequentially was examined using FT-IR and XRD technology. The results show that HCl/HF treatment can effectively remove minerals except pyrite, but HCl can damage the space frame structure of kaolinite. Organic matter structure with the form of disordered amorphous polymers are mainly composed of aliphatic structure in lower metamorphic grade. Acid treatment effect on shale organic macromolecular structure is very low, but has certain influence on the organic structure. HCl treatment mainly influences oxygen containing functional group and benzene ring structure, generates a large amount of carboxylic acid and destroys the polycyclic structure of benzene ring, but has less effect on aliphatic compounds. HF treatment main affects aliphatic compounds, it can destroy the fat chain bridge bond structure fracture, makes fat chain length shorter and decreases content of aliphatics in the samples. Both HF and HCl treatment can destroy the hydroxyl groups of shale, especially for the associated hydroxyl hydrogen bond.