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Mechanochemical sulfidization of a mixed oxide-sulphide copper ore by co-grinding with sulfur and its effect on the flotation efficiency

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Chinese Journal of Chemical Engineering 2020年第3期28卷 743-748页

作者： Mojtaba Masdarian Asghar Azizi zahra bahri Faculty of Mining Petroleum and GeophysicsShahrood University of TechnologyShahroodIran Department of Control and Modeling of Mineral Processing Systems Institute of Mineral ProcessingACECR at Tarbiat ModaresTehranIran

Mechanochemical sulfidization of a mixed sulfide/oxide copper ore by co-grinding with sulfur and additives including Mg(NO3)2 and Fe(NO3)3 salts and iron,aluminum and magnesium powders was investigated for the first ***,the influence of sulfidization during the wet-milling process was examined on the separation efficiency and recovery of copper in *** results demonstrated that co-grinding with sulfur solely had the best flotation performance at the value of 0.5 wt.%and it was attributed to the possible existence of S\\O bonding on copper oxides *** addition,adding magnesium nitrate salt,magnesium powder,iron nitrate salt and aluminum powder as additive associated with 0.5 wt%sulfur into ball milling caused the flotation improvement at the amounts of 0.2 wt%,0.2 wt%,0.5 wt%and 0.5 wt%,***,the effect of grinding time and sulfidization pH with 0.5 wt%sulfur solely was determined and pH s of 7.5 to 8.5 gave the best *** highest recovery(75.76%)and separation efficiency(63.44%)were achieved at pH of 7.5 and 8.5,respectively.

关键词： Sulphide/oxide copper ore Floatability Mechanochemical sulfidization Reductive additives Recovery

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Selective separation of gallium from aluminum in SDS–Ga–Al and SDS–Ga–Al–fluoride systems by ion flotation

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Journal of Central South University 2017年第4期24卷 789-795页

作者： bahri zahra Rezai Bahram1 Kowsari Elaheh Department of Mining and Metallurgical Engineering Amirkabir University of TechnologyTehran 158754413Iran Department of Chemistry Amirkabir University of TechnologyTehran 15916-34311Iran

Selective separation of gallium from aluminum by ion flotation using sodium dodecyl sulfate(SDS) as an anionic surfactant and fluoride as an inorganic ligand was investigated. The experimental results were analyzed using the stability constants and speciation diagrams of fluoride metal complexes. The presence of fluoride in the solution has a positive influence upon the separation of gallium from aluminum. The results show that increasing the fluoride concentration makes a more effective separation of gallium from aluminum because of a simultaneous increase in the complexion of aluminum with fluoride and a change in the electrical charge of the aluminum(ALF_4^-). The dehydration model of LIU and DOYLE was also applied to compare the ion flotation and the selectivity coefficients of gallium over aluminum with experimental results.

关键词： ion flotation gallium(Ⅲ) selective separation inorganic ligand

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Coal washing improvement by determination of optimal mixture of feed blends

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Mining Science and Technology 2011年第6期21卷 819-822页

作者： bahri zahra Shafaei Seyyed Ziaoddin Kor Mohammad Sereshki Farhanga Department of Mining Petroleum and GeophysicsShahrood University of TechnologyShahrood 36199-95161Iran School of Mining Engineering University College of EngineeringUniversity of TehranIran

Coals from different mines are feed in the Zirab plant without any control on weight percentage blending of them. Three major coal types of different ranks (Kiasar, Lavidj and Karmozd) were blended in various proportions to find an optimum condition in flotation circuit in Alborz Markazi coal washing plant. Flotation tests were conducted for prepared blended coal samples to assess floatability of various coal samples. In this paper, mixture design as a statistical method was used to optimize coal blend to increase recovery and grade in Zirab coal washing plant. The statistical analysis showed that the weight percent blending of different coals and interaction between Lavidj and Karmozd regions coal had significant effects on the coal recovery. The optimum condition of 95% recovery and 12% ash content could be reached with 10%, 20%, and 70% blending portion of Kiasar, Lavidj and Karmozd regions coal, respectively.

关键词： Coal blend Coal flotation Optimization Statistical design

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