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Effect and mechanism of octanol in cassiterite flotation using benzohydroxamic acid as collector

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Transactions of Nonferrous Metals Society of China 2016年第12期26卷 3253-3257页

作者： Lei SUN Yue-hua HU Wei SUN School of Minerals Processing and Bioengineering Central South University Changsha 410083 China

The effect of octanol in cassiterite flotation using benzohydroxamic acid (BHA) as a collector was investigated. Theadsorption mechanism of octanol and BHA on the surface of cassiterite was analyzed by adsorption experiments and infrared spectraanalysis. Micro-flotation results indicated that single octanol exhibited almost no collecting power to cassiterite over a wide pHrange. However, as an auxiliary collector, octanol could markedly decrease the consumption of collector BHA and keep the recoveryof cassiterite in high level. The results of adsorption experiments and infrared spectra demonstrated that single octanol was notadsorbed on the surface of cassiterite. It formed adsorption connected with BHA on the surface of cassiterite, and enhanced thehydrophobicity of cassiterite. Octanol promoted the adsorption amount of BHA on the cassiterite surface, and decreased theconsumption of BHA.

关键词： octanol benzohydroxamic acid cassiterite flotation mechanism

On Water： Free Catalysis Approach for the Synthesis of Nitrones from Hydroxamic acids and Dimethy/ Diethyl Acetylenedicarboxylate

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Chinese Journal of Chemistry 2013年第8期31卷 1003-1006页

作者： Jian Li Yongqin He Xiaoyu Ren Xiaokang Shi Sizhuo Yang Xiai Gao Guosheng Huang Key Laboratory of Applied Organic Chemistry Lanzhou University Lanzhou Gansu 730000 China Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province Lanzhou Gansu 730000 China

benzohydroxamic acid reacts with dimethyl acetylenedicarboxylate in the presence of 10 mol% NaOAc to gen- erate （E）-N-（1,4-dimethoxy-l,4-dioxobutan-2-ylidene）-l-phenylcarboxamide oxide in good-to-excellent yield in water at room temperature for 2 h, which supplies a simple, efficient and environmentally friendly method to syn- thesize a wide range of nitrones. The benefits of this strategy not only conform to the requirment of green chemisty, but also possess atom economy.

关键词： nitrones benzohydroxamic acid dimethyl acetylenedicarboxylate environmentally friendly greenchemisty

Effects of particle size and particle interactions on scheelite flotation

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Transactions of Nonferrous Metals Society of China 2014年第11期24卷 3682-3687页

作者：印万忠王纪镇东北大学资源与土木工程学院沈阳110819

Effects of size distribution (particle size and content of fine fraction (<10μm)) on scheelite flotation were studied using flotation tests and theoretical calculations. The results show that particle size influences the scheelite recovery and the performance of combined reagents. The scheelite recovery is lowered by adding fine particles (<10μm) into the pulp containing coarse particles. Extended DLVO (EDLVO) theory confirms that the fine fractions (<10μm) could interface with the coarse fractions. The interaction energy and fluid forces are relative to the particle size, which might explain why the fine fractions influence the scheelite flotation. The highest recovery of scheelite using combined reagents as collector and optimum ratio of combined reagents were determined by scheelite particle size and reagent performance. However, the optimum adding order was only determined by reagent performance, which has nothing to do with particle size.

关键词： scheelite flotation sodium oleate benzohydroxamic acid particle size combined reagents

Selective flotation of smithsonite from dolomite by using novel mixed collector system

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Transactions of Nonferrous Metals Society of China 2019年第5期29卷 1082-1089页

作者： Li WANG Guang-yan HU Wei SUN SultanAhmed KHOSO Run-qing LIU Xiang-feng ZHANG School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral Resources Central South UniversityChangsha 410083China

A novel mixed collector (BHOA) was prepared by mixing benzohydroxamic acid (BHA) and sodium oleate (NaOL) and applied to the flotation separation of smithsonite from dolomite. Flotation results showed that NaOL alone had good collecting performance on smithsonite and common gangue mineral dolomite but had poor selectivity. By using a BHA/NaOL mixed system with a molar ratio of 2:1, the recoveries of smithsonite and dolomite reached approximately 90% and 5%, respectively. Surface tension analysis showed that the surface activity of BHOA was a little higher than that of a single NaOL because of synergistic effects. Zeta potential and X-ray photoelectron spectroscopy measurements indicated that surfactants BHA and NaOL co-absorbed on the smithsonite surface and only NaOL was present on the dolomite surface in the presence of BHOA.

关键词： flotation smithsonite dolomite sodium oleate benzohydroxamic acid sulfuration