Results 151 to 160 of about 839 (198)

The stability of smithsonite

Economic Geology, 1956
The P (sub CO 2 ) -T curve for the reaction ZnCO 3 ZnO + CO 2 has been determined experimentally up to 50,000 lbs/in. 2 of CO 2 . At 10,000, 30,000 and 50,000 lbs/in. 2 the curve passes through 310, 410 and 460 degrees C respectively.
Robert Ian Harker, J. J. Hutta
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Novel 3-Tetradecylamine Propyl Amidoxime Collector for Selective Adsorption on the Surface of Smithsonite for Flotation Separation of Smithsonite from Calcite

Industrial & Engineering Chemistry Research, 2023
Smithsonite has similar physicochemical properties and floatability to calcite, which makes it difficult to achieve flotation separation of smithsonite from calcite with conventional collectors. In this article, a novel 3-tetradecylamine propyl amidoxime (TPA) collector was prepared for the flotation of smithsonite.
Liaoyuan Ouyang, Zhiqiang Huang, Hongling Wang, Guichun He, Xinyang Yu, Vladimir E. Burov, Vladimir Z. Poilov, Fangxu Li, Rukuan Liu, Wenyuan Li, Shuyi Shuai, Shiyong Zhang, Chen Cheng, Weng Fu   +13 more
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Study on the sulfidation behavior of smithsonite

Applied Surface Science, 2015
Abstract Zinc extraction from low-grade mineral resources of oxidized zinc has recently become a focus of study. Sulfidation is an important process in oxidized ore flotation. In this study, the influence of sulfur ion adsorption on smithsonite surface was investigated with the use of zeta potential, inductively coupled plasma (ICP), scanning ...
Dandan Wu, Shuming Wen, Jiushuai Deng, Jian Liu, Yingbo Mao   +4 more
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Contribution of ammonium ions to sulfidation-flotation of smithsonite

Journal of the Taiwan Institute of Chemical Engineers, 2017
Abstract Sulfidation-flotation is commonly performed to recover base metal oxide ores. Sulfidation could become the key process in recovering zinc from zinc oxide ores. We investigated the common zinc oxide mineral. An ammonium salt was used to enhance sulfidation-flotation of smithsonite.
Dandan Wu, Jiushuai Deng, Shaojun Bai
exaly   +2 more sources

Experimental determination of thermodynamic characteristics of smithsonite

The Journal of Chemical Thermodynamics, 2012
Abstract The heat capacity of natural zinc carbonate (smithsonite, ZnCO3) has been measured by the method of low-temperature adiabatic calorimetry over the temperature range of (4.4 to 320) K. Its thermodynamic functions have been calculated based on the experimental data on the heat capacity.
М.R. Bissengaliyeva, D.B. Gogol, Sh.T. Taimassova, N.S. Bekturganov   +3 more
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Kinetics of hydrochloric acid leaching of smithsonite

Russian Journal of Non-Ferrous Metals, 2011
The dissolution kinetics of smithsonite ore in hydrochloric acid solution has been investigated. As such, the effects of particle size (−180 + 150, −250 + 180, −320 + 250, −450 + 320 μm), reaction temperature (25, 30, 35, 40, and 45°C), solid to liquid ratio (25, 50, 100, and 150 g/L) and hydrochloric acid concentration (0.25, 0.5, 1, and 1.5 M) on the
Nikhil Dhawan, M. Sadegh Safarzadeh, Mustafa Birinci   +2 more
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Optical and EPR investigations on smithsonite minerals

Radiation Effects and Defects in Solids, 2004
Optical and EPR investigations have been made on two smithsonite (ZnCO3) minerals, one originating from the USA and the other from the UK. The optical spectra reveal the existence of Cu(II) as impurity in both the samples; and site symmetry for Cu(II) is confirmed to be tetragonally distorted octahedral.
B. J. Reddy, J. Yamauchi, R. V. S. S. N. Ravikumar, A. V. Chandrasekhar, M. Venkataramanaiah   +4 more
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Effect of Ethylenediamine on Smithsonite Flotation

2017
Smithsonite, a typical zinc oxide mineral, has been developed for many years as an alternative source. However, restricted to inferior ability of floating, zinc oxide is one well-known refractory mineral with poor selectivity and high regent consumption. In this paper, ethylenediamine (NH2CH2CH2NH2) was selected to active flotation of smithsonite using
Chao Lv, Shuming Wen, Shaojun Bai, Kun Yang   +3 more
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Physicochemical aspects of smithsonite flotation

2014
The wide use of zinc and the exhaustion of traditional sulfide zinc resources provide the motivation to consider oxide zinc mineral resources. Smithsonite is the most abundant nosulfide zinc mineral but it is hard to be separated from other carbonate minerals by flotation techniques.
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Dissolution regularities of smithsonite in methane sulfonic acid

Russian Journal of Non-Ferrous Metals, 2015
Methane sulfonic acid (MSA) was proposed as a clean and efficient leaching agent to extract zinc from smithsonite. Experimental variables such as acid concentration, reaction temperature, particle size, and stirring speed were considered. Results indicated that zinc leaching fraction increased with increased MSA concentration, reaction temperature ...
Qicheng Feng, Shuming Wen, Wenjuan Zhao, Xv Bai, Yu Chen   +4 more
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