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| 1 | An improved implementable process for the synthesis of zeolite 4A from bauxite tailings and its Cr^(3+) removal capacity显示文摘A simple and practical method for the synthesis of zeolite 4A from bauxite tailings is presented in this paper. Systematic investigations were carried out regarding the capacity of zeolite 4A to remove Cr(III) from aqueous solutions with relatively low initial concentrations of Cr(III)(5–100 mg·L^(-1)). It is found that the new method is extremely cost-effective and can significantly contribute in decreasing environmental pollution caused by the dumping of bauxite tailings. The Cr(III) removal capacity highly depends on the initial p H value and concentration of Cr(III) in the solution. The maximum removal capacity of Cr(III) was evaluated to be 85.1 mg×g^(-1) for zeolite 4A, measured at an initial p H value of 4 and an initial Cr(III) concentration of 5 mg·L^(-1). This approach enables a higher removal capacity at lower concentrations of Cr(III), which is a clear advantage over the chemical precipitation method. The removal mechanism of Cr(III) by zeolite 4A was examined. The results suggest that both ion exchange and the surface adsorption-crystallization reaction are critical steps. These two steps collectively resulted in the high removal capacity of zeolite 4A to remove Cr(III). | Peng-cheng Lei Xian-jiang Shen Yang Li Min Guo Mei Zhang | 2016 | International Journal of Minerals,Metallurgy and Materials2016，23，7： | 3 |
| 2 | A novel process for comprehensive utilization of vanadium slag显示文摘Traditional processes for treating vanadium slag generate a huge volume of solid residue and a large amount of harmful gas,which cause serious environmental problems.In this study,a new process for the comprehensive utilization of vanadium slag was proposed,wherein zeolite A and a V_2O_5/TiO_2 system were synthesized.The structural properties of the as-synthesized zeolite A and the V_2O_5/TiO_2system were characterized using various experimental techniques,including X-ray diffraction,X-ray fluorescence,scanning electron microscopy,and infrared spectroscopy.The results reveal that zeolite A and the V_2O_5/TiO_2 system are successfully obtained with high purity.The results of gas adsorption measurements indicate that the prepared zeolite A exhibits high selectivity for CO_2 over N_2 and is a candidate material for CO_2 capture from flue-gas streams. | Li-ying Liu Tao Du Wen-jun Tan Xin-pu Zhang Fan Yang | 2016 | International Journal of Minerals,Metallurgy and Materials2016，23，2： | 2 |
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