Research on Mechanical Activation Properties and Leaching Test of Arseno-pyrite

Yanhua LIU; Guobao CHEN; Hongying YANG; Zhenan JIN; Gairong WANG

doi:10.11872/j.issn.1005-2518.2018.05.669

Gold Science and Technology >

2018 , Vol. 26 >Issue 5: 669 - 676

DOI: https://doi.org/10.11872/j.issn.1005-2518.2018.05.669

Research on Mechanical Activation Properties and Leaching Test of Arseno-pyrite

Yanhua LIU ,
Guobao CHEN ^* ,
Hongying YANG ,
Zhenan JIN ,
Gairong WANG

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¹School of Metallurgy，Northeastern University，Shenyang 110819，Liaoning，China

Received date: 2018-08-01

Revised date: 2018-09-07

Online published: 2018-10-31

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Highlights

The effect of a new pretreatment method i.e. mechanical activation on the solid-state and dissolution properties of arsenopyrite was studied.In a planetary ball mill，arsenopyrite was mechanically activated for 1 h at different grinding speeds.The analysis of particle size and specific surface area indicated that the particle size of arsenopyrite decreased rapidly at first and then increased slightly with increase of milling speed.The optimum particle distribution，minimum particle size value of 2.36 μm and maximum specific surface area of 2.667 m²/g can be observed at milling speed of 300 r/min.The morphology of arsenopyrite at different milling speeds was observed by scanning electron microscopy（SEM），and it was found that the surface of arsenopyrite formed micro-nano particles and amorphization degree significantly increased with the increase of milling speed.XRD（X-ray diffraction）analysis results showed that with the increase of milling speed，no phase transformation occured，but the amorphization degree of arsenopyrite increased to 72%， lattice distortion increased from 0.014% to 0.097%，and crystallite size decreased from 75.6 nm to 56.0 nm.The characteristic peaks of 217.2 cm^-1and 273.7 cm^-1of arsenopyrite were analyzed by Raman spectroscopy.It was found that the vibration of the characteristic peak located at 273.7 cm^-1was more sensitive to the mechanical stress.Finally，the leaching tests of arsenopyrite were carried out by Fe₂（SO₄）₃solution.The results showed that contrasted with unactivated arsenopyrite，total arsenic extraction from arsenopyrite has doubled to nearly 48.74% under the optimum milling speed of 300 r/min.

Cite this article

Yanhua LIU , Guobao CHEN , Hongying YANG , Zhenan JIN , Gairong WANG . Research on Mechanical Activation Properties and Leaching Test of Arseno-pyrite[J]. Gold Science and Technology, 2018 , 26(5) : 669 -676 . DOI: 10.11872/j.issn.1005-2518.2018.05.669

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