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330 results on '"Li Xingbin"'

1. Characteristics and purification of Himalayan salt by high temperature melting

Author

Deng Zhigan, Huang Xing, Wei Chang, Li Xingbin, Li Minting, and Luo Xingguo

Subjects
himalayan salt, insoluble matter, purification, high temperature melting, Technology, Chemical technology, TP1-1185, Chemicals: Manufacture, use, etc., TP200-248
Abstract

Himalayan rock salt contains a variety of minerals and trace elements, which is conducive to human health. The solutions of black rock salt and rose salt are alkaline, and the content of water insoluble matter is 0.34 and 0.083%, respectively. The element composition of water insoluble matter in rock salt is determined and analyzed. It is found that the main component of two kinds of rock salt water insoluble matter is soil. Due to the presence of water insoluble matter in rock salt, according to the different specific gravity of molten sodium chloride and insoluble matter, rock salt was purified by high-temperature melting method. Rose salt is mainly studied during purification. The results showed that the content of insoluble matter in rose salt decreased from 0.083 to 0.0024% after holding at 950°C for 40 min; the contents of arsenic, barium, and lead decreased to 0.0032, 0.61, and 0.21 mg·kg−1, respectively; the content of sodium increased to 39.24%, the contents of calcium, magnesium, and iron reached to 2,200, 855, and 1.31 mg·kg−1, respectively.

Published
2023
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25. An Environmentally Friendly Method for Producing α-Fe2O3 Pigment from Low-Grade Hematite Residue.

Author

Peng, Xiaohua, Li, Xingbin, Wei, Chang, Deng, Zhigan, Li, Minting, and Fan, Gang

Subjects
CRYSTAL surfaces, HYDROMETALLURGY, PIGMENTS, ZINC, CRYSTALS
Abstract

This study employed low-grade hematite acquired from zinc hydrometallurgy to synthesize α-Fe2O3 pigment via high-temperature hydrothermal treatment. This study investigated the effects of hydrothermal conditions on α-Fe2O3 pigment. The results indicate that hydrothermal treatment causes the internal rearrangement of Fe (oxyhydr)oxides into Fe oxides. A high-quality α-Fe2O3 pigment with a Fe content > 69% and Zn and S content < 0.15% and 0.25% was successfully synthesized using the HCl-H2O medium at > 260°C. The average crystal size of α-Fe2O3 pigment was found to be between 45 nm and 80 nm. The α-Fe2O3 pigment consists of prismatic crystals with a smooth surface and distinct edges. The UV-VIS-NIR spectra demonstrated that the α-Fe2O3 pigment strongly absorbs light in the wavelength range of 200–420 nm, and its absorption edge falls between 420 nm and 550 nm. Additionally, the α-Fe2O3 pigment has chromatic values of L* = 37.27–38.69, a* = 5.07–6.26, and b* = 1.70–2.49. All α-Fe2O3 products show similar colors. This work introduces an environmentally friendly method for synthesis of high-quality α-Fe2O3 pigment using iron removal residue in zinc hydrometallurgy. [ABSTRACT FROM AUTHOR]

Published
2024
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37. Determination of the solubility of MgSO4in the Zinc hydrometallurgy system within the temperature range of 263.15 K–293.15 K

Author

Jin, Xin, Li, Xingbin, Zhen, Yong, Luo, Xingguo, Wei, Chang, Deng, Zhigan, and Li, Minting

Abstract

ABSTRACTSolid–liquid equilibrium solubility of magnesium sulphate (MgSO4) is essential for designing and optimising the removal and recovery of magnesium (Mg) from standard zinc (Zn) hydrometallurgy systems via freeze crystallization. In this study, the solubility data of MgSO4in ternary system MgSO4-H2SO4-H2O and quaternary system MgSO4-ZnSO4-H2SO4-H2O were determined in different zinc sulphate (ZnSO4) concentrations and sulphuric acid (H2SO4) concentrations through the isothermal equilibrium method within the temperature range from 263.15–293.15 K. The results indicated that the solubility of MgSO4decreased with decreasing temperature and increasing concentrations of H2SO4and ZnSO4. Furthermore, the modified Apelblat equation was applied to correlate the experimental solubility data, yielding results consistent with the experimental findings. Furthermore, X-ray diffraction (XRD) and scanning electron microscopy-energy dispersive X-ray spectroscopy SEM-EDS analysis results indicated that the main phases of the equilibrium solid consist of mixed crystallization products of Zn sulphate heptahydrate (MgSO4·7H2O) and Mg sulphate heptahydrate (ZnSO4·7H2O). The microstructure of the equilibrium solid was affected by the sulphate concentration.

Published
2024
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40. Effect of manganese(II) and magnesiumg(II) in zinc acid leaching solution on iron precipitation via the hematite process.

Author

Zhou, Xuantong, Yang, Fuxian, Deng, Zhigan, Peng, Xiaohua, Li, Xingbin, and Wei, Chang

Subjects
PARTICLE size distribution, HEMATITE, ENVIRONMENTAL standards, ACID solutions, ENVIRONMENTAL protection
Abstract

Iron (Fe) removal is a critical step in the hydrometallurgical zinc (Zn) extraction process. Hematite, a stable Fe precipitate, offers an environmentally friendly option that complies with environmental protection standards. While existing research primarily focuses on hematite process technology, there is a lack of studies on how ions in ZnSO4 leaching solutions affect Fe removal efficiency and hematite particle size distribution. This study investigated the influence of manganese II (Mn(II)) and magnesium II (Mg(II)) concentrations and temperature on both Fe removal efficiency and hematite particle size distribution in ZnSO4 leaching solution. The results indicated that at various temperatures, the highest Fe removal efficiency occurred with an initial Mn(II) concentration of 10 g/L and an Mg(II) concentration of 15 g/L. As the concentrations of Mn(II) and Mg(II) as well as temperature increased, FeSO₄ crystallization also increased, which adversely affected hematite precipitation. The average particle size of hematite decreases from 300 to 100 nm, resulting in a more uniform particle size distribution, which correlated with the homogeneous solution saturation precipitation mechanism. However, the number of rod-shaped, regular small particles decreases, while the number of irregular, blocky particles increased. [ABSTRACT FROM AUTHOR]

Published
2024
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