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30 results on '"Deng, Rongdong"'

28. Ion migration law in flotation pulp and its influence on the separation of smithsonite and quartz.

Author

Deng, Rongdong, Hu, Yuan, Ku, Jiangang, Ma, Yingqiang, and Yang, Zhengguo

Subjects
*FLOTATION, *ION migration & velocity, *SMITHSONITE, *QUARTZ, *ZETA potential, *SEPARATION (Technology)
Abstract

This study investigated the migration law of ion release and adsorption in the flotation pulp of oxide zinc ore, and found that numerous different ions existed in the pulp. The total concentrations and major sources of various ions (Pb2+, Zn2+, Fe3+, Ca2+, Mg2+, SO42-, etc.), released from the minerals after grinding, were determined. The zeta potential tests indicated that a mixed-ion solution strongly influences the surface charge of the minerals. The flotation tests show that the migration law of ions is detrimental to the separation and concentration of minerals. [ABSTRACT FROM PUBLISHER]

Published
2018
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29. Concentration of high-sulphur copper ore using a three-product magnetic flotation column.

Author

Deng Rongdong, Hu Ting, Liu Quanjun, Ye Fenghong., Deng Rongdong, Hu Ting, Liu Quanjun, and Ye Fenghong.

Abstract

A tower-like magnetic system comprising eight permanent magnets was installed at the centre of a flotation column to separate chalcopyrite and pyrrhotite minerals. A cyclonic flotation was installed within the underpart of the column to separate the pyrrhotite from the gangues. A three-product magnetic flotation column was fabricated to create a magnetic field and a cyclonic zone. The products were Cu concentrates, pyrrhotite concentrates and tailings. The theoretical magnetic field strengths and the magnetic forces were calculated. The results of the flotation experiments showed that the Cu grade increased from 14.20% without the magnetic field to 26.40% in the presence of the magnetic field and that the S grade in the pyrrhotite concentrates increased in the presence of cyclonic flotation. The separation efficiency of this magnetic flotation column was evident. Therefore, this three-product magnetic flotation column may have a potential application, due to its high separation efficiency. (Authors), A tower-like magnetic system comprising eight permanent magnets was installed at the centre of a flotation column to separate chalcopyrite and pyrrhotite minerals. A cyclonic flotation was installed within the underpart of the column to separate the pyrrhotite from the gangues. A three-product magnetic flotation column was fabricated to create a magnetic field and a cyclonic zone. The products were Cu concentrates, pyrrhotite concentrates and tailings. The theoretical magnetic field strengths and the magnetic forces were calculated. The results of the flotation experiments showed that the Cu grade increased from 14.20% without the magnetic field to 26.40% in the presence of the magnetic field and that the S grade in the pyrrhotite concentrates increased in the presence of cyclonic flotation. The separation efficiency of this magnetic flotation column was evident. Therefore, this three-product magnetic flotation column may have a potential application, due to its high separation efficiency. (Authors)

30. Improvement Effect of FeSO 4 ·7H 2 O on Flotation Separation of Scheelite from Fluorite.

Author

Hu Y, Huang Y, Deng R, Ma L, and Yin W

Abstract

In this study, FeSO 4 ·7H 2 O was used as an auxiliary depressant to improve the selective depression effect on fluorite. Microflotation tests using oleic acid as the collector showed that the pre-addition of FeSO 4 ·7H 2 O and subsequent addition of sodium silicate (SS) resulted in a stronger selective depression effect on fluorite compared with SS alone. Addition of FeSO 4 ·7H 2 O reduced the required dosage of SS and had little negative effects on scheelite recovery. The selective depression mechanism of FeSO 4 ·7H 2 O was investigated in detail. X-ray photoelectron spectroscopy indicated that the difference in the number of surface active sites was the mechanism for improved differential flotation of scheelite from fluorite. The improved depression of fluorite was attributed to both ferrous and sulphate ions. The pre-adsorption of ferrous species increased the number of active sites, enhancing the adsorption of silicate species on the fluorite surface. Simultaneously, sulfate ions were selectively adsorbed on the fluorite surface to form hydrophilic calcium sulfate, reducing the floatability of fluorite., Competing Interests: The authors declare no competing financial interest.

Published
2019
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