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WANG Guan, DAI Jie, WANG Kun-yang, YANG Yin, HU Zhi-zhong. Occurrence of Associated Elements in a Copper Mine by EDX-SEM[J]. Rock and Mineral Analysis, 2021, 40(5): 659-669. DOI: 10.15898/j.cnki.11-2131/td.202012240172
Citation: WANG Guan, DAI Jie, WANG Kun-yang, YANG Yin, HU Zhi-zhong. Occurrence of Associated Elements in a Copper Mine by EDX-SEM[J]. Rock and Mineral Analysis, 2021, 40(5): 659-669. DOI: 10.15898/j.cnki.11-2131/td.202012240172
shu

Occurrence of Associated Elements in a Copper Mine by EDX-SEM

  • Chengdu Centre of Geological Survey, China Geological Survey, Chengdu 610081, China

More Information
  • Received Date: December 23, 2020
  • Revised Date: March 24, 2021
  • Accepted Date: May 03, 2021
  • Published Date: September 27, 2021
    Abstract
  • HIGHLIGHTS
    (1) A EDX-SEM method to characterize the occurrence of associated elements in copper ores was established with optimized experimental conditions.
    (2) The problem that associated elements in copper deposits were difficult to observe was solved by the techniques of backscattered image, secondary electron image observation and spot, line and mapping analyses of energy dispersive X-ray spectroscopy.
    (3) Gold, silver, cobalt, bismuth, and selenium in the Liwu copper deposit occurred as the independent minerals or in the form of similar isomorphic substitution in other minerals. The research results provided microscopic evidence for the resource valuation of the deposit and the metallurgical process.
    BACKGROUNDAssociated elements in copper deposits are of high economic value. However, they are difficult to locate and utilize because of their fine (micrometer to nanometer) size.
    OBJECTIVESTo develop a method for determining the occurrence of associated elements in copper deposits.
    METHODSBackscatter image, secondary electron image, X-ray spectrum point, line and mapping analysis technology were used to determine the mineral phases, morphological characteristics, occurrence, qualitative/quantitative and distribution laws of the associated elements of the copper deposit. The acceleration voltage of the scanning electron microscope was 20kV, the emission current was 10μA, and the energy spectrum dwelling time was 100s.
    RESULTSThe key technologies in the sample pretreatment and analysis were discussed in detail to form a set of effective analyses of copper deposits. The energy spectrum-scanning electron microscope (EDX-SEM) microanalysis method of associated elements was established. Gold, silver, cobalt, bismuth, and selenium were all distributed in other minerals in the form of independent minerals or isomorphic substitution.
    CONCLUSIONSThrough the study of the occurrence of the associated elements, a micro basis for the identification of mineral industrial value, mine resource evaluation, and the recovery and utilization of associated elements has been established, and provides technical support for mining, beneficiation and smelting formulation.

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