X-ray Fluorescence Spectrometry Determination Of Major And Minor Components Of Copper Ore And Bauxite Bioleaching

Modern X-ray fluorescence spectroscopy is a common measurement method of multi-elements simultaneous determination from various materials.Due to its rapid speed, simple sample preparation, reproducible, accurate, non-destructive, and environmental, it is widely used to analyzed sample in a variety of areas, but less applied to the analysis of copper ore. Powered press and fusion condition was provided to prepare samples.The major and minor components of the copper ore samples were determined by Wavelength dispersive XRF.It was Found that when powered press were selected, samples crushed to 74μm below (through 200 mesh sieve) and pressed with boric acid as margin band and underlaying the substrate, tested, the major components analysis results were somewhat unreasonable. But the precision and accuracy of minor components could meet the analytical requirements of copper ore. With fusion method, lithium tetraborate-lithium metaborate(m/m=12:22)as flux,sodium nitrate as oxidant, sample and oxidant ratio 1:4, mixed sample and flux ratio 1:7, sample pre-oxidation at 600℃after adding 2 drops of saturated lithium bromide as releasing agent, fused at 1050℃for 15min, the made glass disc was determined. Based on the selected conditions, the sample analysis results accorded with the certified values.And the precision of major components could meet the analysis needs of the copper ore components.Biometallurgy is a new technology, which mineral is used as energy substance of microorganism by metabolize action or value metals are leached from mineral by the metabolite,Iron or aluminum was leached from different bauxite by some microorganism in the way of organic acid of metabolite etching ore and chelating dissolved metalline ions.The calibration curve was plotted with national standard sample and artificially synthesized standard sample. In this study, the iron of the bauxite containg iron was removed by biochemistry leaching method, while alluminum of low-grade bauxite was leached. It was found that when the bauxite containing iron was leached by the Aspergillus niger numered YJY-1# zymotic fluid under temperture 80℃-90℃,the Fe2O3 content can be removed from 4.96% to 2.87%. If using 2% sulfuric acid added to the zymotic fluid and pH lowed to 0.5, then the Fe2O3 content in the ore decreased to 0.39%. The same method used to leach aluminum in low-grade gibbsite ore, it was found that when the ore was calcined under temperture 525℃for 4 hours, then leached for 10 hours under 80℃-90℃,the leaching agent changed every 2 hours, the aluminum leaching rate reached 90.99%.