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- Title
超细地质样品的谱学特征及矿物分布形态研究.
- Authors
魏均启; 董学林; 向兆; 朱丹; 童铮云; 陈国超; 刘爽; 王芳; 潘诗洋; 鲁力
- Abstract
The grain size of geological samples has become a key factor restricting the improvement of analytical accuracy. In recent years, the preparation of ultra-fine geological samples has been paid more and more attention by geological analysis laboratories. Currently, widely used geological samples with grain size of 74 are increasingly unable to meet the requirements of high precision, high sensitivity, small sampling volume and micro-area modern analysis technology. Therefore, it is necessary to develop the preparation technology of ultrafine geological samples suitable for mass production in geological laboratories. X-ray powder diffraction, scanning electron microscopy and differential thermal analysis were used to obtain the spectral characteristics of the geological samples before and after the ultra-fine, and the distribution and morphology of minerals in the ultra-fine geological samples were studied. The results showed that ultrafine processing leaded to a decrease in the crystallinity of minerals and distortion of crystal cells. The particle size distribution of minerals was mainly concentrated between 0.5 and 30 As the particle size decreased, the edges and corners of mineral particles gradually disappeared, and the particle boundaries became blurred. After the mineral was ultrafine, the thermal effect range of losing adsorbed water became wider, and the endothermic effect became wider and slower. In ultrafine geological samples, minerals had four distribution forms: single particle, aggregate, aggregation, and encapsulation・ The main factors affecting their ultrafine degree were the difficult to crush mineral single particles and mineral aggregates. This study basically identified the spectral characteristics and mineral morphology distribution characteristics of ultra-fine geological samples, which can provide scientific basis for improving the preparation process of ultra-fine geological samples and developing advanced preparation technology, and is also of great significance for solving the homogeneity problem of ultra-fine geological samples and improving the accuracy of geological sample analysis.
- Subjects
DIFFERENTIAL thermal analysis; X-ray powder diffraction; PARTICLE size distribution; MINERAL aggregates; SCANNING electron microscopy
- Publication
Chinese Journal of Inorganic Analytical Chemistry / Zhongguo Wuji Fenxi Huaxue, 2024, Vol 14, Issue 9, p1299
- ISSN
2095-1035
- Publication type
Article
- DOI
10.3969/j.issn.2095-1035.2024.09.014