| 关于煤系石墨鉴定标准的讨论 |
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| 引用本文： | 曹代勇,王路,朱文卿,吴国强,魏迎春,宁树正,王桂香,肖金成,徐祥,刘亢.关于煤系石墨鉴定标准的讨论[J].煤田地质与勘探,2022,50(12):105-113. |
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| 作者姓名： | 曹代勇 王路 朱文卿 吴国强 魏迎春 宁树正 王桂香 肖金成 徐祥 刘亢 |
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| 作者单位： | 1.中国矿业大学(北京) 地球科学与测绘工程学院，北京 100083 |
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| 基金项目： | 国家自然科学基金项目(42072197，41772156)，湖南省自然资源科研(标准)项目(2021B03)；国家能源局能源行业标准制定计划项目(20210092) |
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| 摘 要： | 煤系石墨的鉴别及其类型划分，是矿产地质勘查和资源开发利用的前提条件和基础性工作，制定煤系石墨鉴定标准应遵循科学性、系统性、适用性和可操作性的原则。煤石墨化作用与煤化作用是连续递进加跃变的演化过程，煤系石墨的大分子结构阶跃性演化和物质组成非均质性等特点，造成矿种鉴别的复杂性。为制定科学实用的鉴定标准，从成矿机制研究和资源评价需求出发，按照矿石总体石墨化程度由高至低，划分了煤系石墨一号、二号、三号等3种类型；在前期工作的基础上，补充了110多组实测数据，修改完善了由初步鉴定指标和精确鉴定指标构成的煤系石墨鉴定指标体系。初步鉴定指标包括挥发分产率Vdaf和最大反射率Rmax，用于资源评价和地质勘查阶段初步区分煤与煤系石墨；精确鉴定指标包括晶面间距d002及其等效的石墨化度G、拉曼光谱参数R2，用以精确鉴别煤与煤系石墨，并划分煤系石墨类型。基于涵盖我国主要煤系石墨矿山500余组样品实测数据统计分析结果，确定了煤系石墨类型划分指标:煤系石墨一号，0.335 4 nm≤d002<0.338 0 nm(G>0.70)、R2<0.50；煤系石墨二号，0.338 0 nm≤d002<0.340 0 nm(G>0.50~0.70)、R2值范围0.50~0.60；煤系石墨三号，0.340 0 nm≤d002<0.344 0 nm(G>0~0.50)，R2值范围0.50~0.60。根据上述指标，建立了煤系石墨鉴定模板，主要煤系石墨矿山样品测试数据表明，该鉴定模版具有实用性和可操作性。
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| 关 键 词： | 煤系石墨 鉴定标准 指标 类型划分 鉴定模板 |
| 收稿时间： | 2022-07-04 |
Discussion on identification standard of coal-measure graphite |
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| Affiliation: | 1.School of Geoscience and Surveying Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China2.Department of Geology and Surveying and Mapping Engineering, Shanxi Institue of Energy, Jinzhong 030600, China3.Academy of Coal Geological Survey of Hunan Province, Changsha 410000, China4.General Prospecting Institue of China National Administration of Coal Geology, Beijing 100039, China5.Henan Geology Bureau, CCGMB, Zhengzhou 450000, China |
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| Abstract: | The identification and classification of coal-measure graphite are the precondition and basic work of mineral geological exploration, as well as resource exploitation and utilization. The preparation of identification standards of coal-measure graphite should follow the principles of science, systematicness, applicability and operability. Coal graphitization and coalification is a continuous progression plus jump process, and the characteristics of coal-measure graphite, including the step evolution of macromolecular structure and the heterogeneity of material composition, leads to the complexity of ore identification. In order to establish the scientific and practical identification standards, and from the study of metallogenic mechanism and the demand of resource evaluation, coal-measure graphite was divided into three types: No.1, No.2 and No.3, according to the graphitization degree of the ore as a whole ranges from high to low. On the basis of the previous work, more than 110 groups of measured data were added, and the identification index system of coal-measure graphite composed of the preliminary and precise identification indexes was modified and perfected. The preliminary identification indexes, including the volatile yield Vdaf and the maximum reflectivity Rmax, are used to roughly distinguish coal and coal-measure graphite in the stage of resource evaluation and geological exploration. The precise identification indexes, including the interplanar spacing d002, its equivalent graphitization degree G, and Raman spectrum parameter R2, are used to accurately distinguish coal and coal-measure graphite, and to classify the types of coal-measure graphite. Besides, the classification indexes of coal-measure graphite were determined based on the statistical analysis results of the measured data of over 500 groups of samples from the main coal-measure graphite mines in our country, including No.1 coal-measure graphite with 0.335 4 nm ≤ d002 < 0.338 0 nm (G > 0.70) and R2 < 0.50; No.2 coal-measure graphite with 0.338 0 nm ≤ d002 < 0.340 0 nm (G>0.50?0.70) and R, 0.50?0.60; and No. 3 coal-measure graphite with 0.340 0 nm ≤ d002 < 0.344 0 nm (G>0?0.50) and R, 0.50?0.60. Thus, an identification template of coal-measure graphite was established based on the above indexes, which was practical and operable according to the test data of samples from the main coal-measure graphite mines. |
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