کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
233019 465319 2015 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Flotation of pyrrhotite and pyrite in saturated CaCO3 solution using a quaternary amine collector
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Flotation of pyrrhotite and pyrite in saturated CaCO3 solution using a quaternary amine collector
چکیده انگلیسی


• Flotation recoveries of pyrrhotite and pyrite are highly dependent on pH.
• In general, the recoveries of pyrrhotite and pyrite decrease with pH.
• Pyrite floats considerably faster than pyrrhotite between pH 8–11.
• Recoveries were dependent on conditioning time.
• The flotation results could not be fully explained by zeta potential.

In the production of ground calcium carbonate (GCC) for the paper industry, any colouring contaminants must be removed during processing (usually flotation) to achieve sufficient GCC brightness. Flotation of GCC feedstock is characterised by the presence of both particulate and dissolved calcite (CaCO3), an alkaline pH and the use of amine collectors. This paper investigates the possibility of removing pyrrhotite and pyrite, under these conditions. Microflotation results show that the recoveries are highly dependent on pH. Pyrrhotite recovery decreases dramatically when going from pH 8 to pH 10. Pyrite display high recoveries at pH 8 and 9, and lower recoveries at higher pH. Recoveries were dependent on conditioning time. Pyrite floats considerably faster than pyrrhotite at all pH levels investigated, whereas pyrrhotite seems to be slow floating and could benefit from prolonged flotation times. Compared to the saturated CaCO3 system, flotation recoveries decreased when using deionised water or CaCl2 solution. The flotation results could not be fully explained by zeta potential. Bench scale flotation experiments on a sulphide bearing marble, confirmed the microflotation results at low collector concentrations (i.e. 200 g/t). By increasing the amine concentration, the flotation performance became independent of pH.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Minerals Engineering - Volume 70, January 2015, Pages 55–63
نویسندگان
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