Study on Accuracy of Quantitative Analysis of Minerals under Rotating Stage Microscopy

Bing-fei YANG; An-sheng FENG

doi:10.15898/j.cnki.11-2131/td.201709270156

2018 Vol. 37, No. 3

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Article navigation > Rock and Mineral Analysis > 2018 > 37(3): 292-297

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Bing-fei YANG, An-sheng FENG. Study on Accuracy of Quantitative Analysis of Minerals under Rotating Stage Microscopy[J]. Rock and Mineral Analysis, 2018, 37(3): 292-297. doi: 10.15898/j.cnki.11-2131/td.201709270156

Citation:

Bing-fei YANG, An-sheng FENG. Study on Accuracy of Quantitative Analysis of Minerals under Rotating Stage Microscopy[J]. Rock and Mineral Analysis, 2018, 37(3): 292-297. doi: 10.15898/j.cnki.11-2131/td.201709270156

Study on Accuracy of Quantitative Analysis of Minerals under Rotating Stage Microscopy

Bing-fei YANG^1,,
An-sheng FENG^2,3, ,

1.
School of Gem and Material Technology, Hebei GEO University, Shijiazhuang 050031, China
2.
Zhengzhou Institute of Multipurpose Utilization of Mineral Resources, Chinese Academy of Geological Sciences, Zhengzhou 450006, China
3.
China National Engineering Research Center of Utilization of Industrial Minerals, Zhengzhou 450006, China

More Information

Corresponding author: An-sheng FENG, sinomines@163.com

Received Date: 27 September 2017

Revised Date: 11 January 2018

Accepted Date: 07 May 2018

Abstract

Abstract

Mineral quantitative analysis by optical microscope is simple and reliable, and has been widely used in process mineralogy and rock-mineral determination. The line measurement method is fast and efficient, and is suitable for fine-grained mineral particles, which plays an important role in the application. However, the conventional test line has the characteristics of directional identity, and cannot deal with the problem of 'preferential orientation' of the analyzed mineral particles. To solve this problem, a new mineral quantitative method by rotating the platform of an optical microscope was conducted. The main principle is that the length ratio of the circular cutting lines of different mineral particles is equal to their volume ratio. The main test process of the method is as follows:rotating the objective table for a circle and testing the angles (ΔK) that the circular cutting line contained, which is intersected by the mineral particles and the visual field under the microscope. By testing a certain number of visual fields (N) and calculating weight percentage (W), the percent content is acquired by the equation W=[∑ΔK/(N×360)]·(δ/Δ)×100%. After theoretical analysis, the galena, sphalerite, and magnetite thin sections were examined. The results show that the new mineral quantitative method is simple, accurate, and the difference value of the test results is less than ±5% compared with the conventional line measurement method. In addition, this method can be used to effectively solve the negative effect of 'preferential orientation' on the test results.
- rotate the objective table /
- microscope /
- mineral quantitation /
- accuracy

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