Thermodynamics and density functional theory study of potassium dichromate interaction with galena

Chen, Jianhua; Long, Xiaoyang; Lan, Lihong; He, Qian

doi:10.1007/s12613-014-0994-6

Cited by 7 publications

(1 citation statement)

References 24 publications

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“…Although galena and sphalerite in the study were highly pure natural minerals, yet the surface changes of the minerals during grinding were still likely to be very complex . Recent studies have shown that galena and sphalerite contain rich fluid inclusions that can be destroyed by grinding, and the components will be released into the ore pulp, which affects the subsequent surface adsorption and flotation. ,, In addition, the dissolution of the minerals, as well as the effects of O 2 and H 2 O, also affects the mineral surface component. ,− Therefore, the changes in the surface component during grinding may not be fully reflected by only analyzing the chemical changes of Pb, Zn, and Fe on the surfaces of galena and sphalerite.…”

Section: Resultsmentioning

confidence: 98%

Study on the Interaction between Galena and Sphalerite During Grinding Based on the Migration of Surface Components

et al. 2019

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In Pb–Zn ore flotation, unintentional activation of sphalerite often leads to difficult separation of Pb and Zn minerals, during which grinding plays a key role in unintentional activation. Therefore, the aim of this study was to evaluate the surface component changes of two different mineral particles and to propose the interaction between galena and sphalerite during mixed grinding using time-of-flight secondary ion mass spectrometry (ToF-SIMS). The results show that after mixed grinding of the galena and sphalerite, the Pb content on the sphalerite surface increased with the decrease of Zn and Fe contents on the sphalerite surface. The lead ions from galena were obviously absorbed onto the sphalerite surface, while the zinc and iron ions from sphalerite were not obviously migrated to the galena surface. Principal component analysis (PCA) of a dataset composed of 206 positive ion peaks of galena and sphalerite indicates that the surface components of galena and sphalerite migrated from either side to different degrees. This study successfully identified an important factor for unintentional activation of lead and zinc minerals during flotation: homogenization of surface components of different minerals during grinding.

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