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RISS 인기검색어
- 검색키워드
- 저자 : Mahdi Gharabaghi (검색결과 2 건)
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A review on electrochemical behavior of pyrite in the froth flotation process
Hossein Moslemi,Mahdi Gharabaghi 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.47 No.-
Metal sulfides are usually semiconductor and cause electrochemical reactions. This phenomenon playsan important role in sulfideflotation. Pyrite as the most abundant sulfide mineral is often associated withvaluable sulfide minerals, coal and gold. It is very important to study its electrochemical behavior in theflotation process. This review focuses on researches carried out over the past several decades that havestudied electrochemical processes associated with pyrite occurring duringflotation. The mechanism ofprocesses such as oxidation, activation, depression, and interactions of activated and non-activatedsurfaces with collectors as well as factors affecting them are described. Moreover, the effect ofelectrochemical conditions during grinding on theflotation process is also discussed. It has been foundthat moderately oxidizing conditions are favorable for collector-lessflotation of pyrite while stronglyreducing or oxidizing potentials lead to its depression. Increasing the electrochemical potential not onlyhas a deleterious effect on the activation of pyrite by copper, but also facilitates its depression bydepressants. In the case of the adsorption of xanthate whether on activated or non-activated surfaces, agreat increase or decrease in the potential has adverse effects and it is necessary to optimize theelectrochemical conditions. Various factors such as pH, solid percentage, particle size distribution,flotation time, type and concentration of reagents and oxygen content as well as grinding conditions canaffect the intensity of these electrochemical interactions. It is proposed that further researches usingadvanced chemical analysis techniques are needed to understand the electrochemical processes involvedinflotation systems.
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Synergism effect of collectors on copper recovery in flotation of copper smelting slags
Mostafa Shamsi,Mohammad Noaparast,Seied Ziadin Shafaie,Mahdi Gharabaghi 한국자원공학회 2016 Geosystem engineering Vol.19 No.2
Study on the effect of collectors synergism on flotation recovery of copper from copper smelting slags has been described in this paper. After analysis of flotation tests, modeling of copper recovery from slags containing this metal was done. Following the model validation, optimization of effective parameters on Cu recovery was performed. Results of optimization showed that when 10 g/t Z6 as collector and 50 g/t AERO 3477 as modifier were used separately, copper recovery (62.23%) was obtained under optimal conditions. To increase the copper recovery, a mixture of 6 g/t Z6, 4 g/t Z11, 30 g/t AERO 3477, and 20 g/t AERO 208 were used to determine synergism effect of collectors on copper recovery. After doing flotation tests at optimal conditions with mixture of collectors, copper recovery was increased to 80.27%.
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