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content in iron and the recovery rate of vanadium in pig iron increase as the CaO content, MgO content and smelting temperature increase, whereas the vanadium distribution ratio between the slag and iron tends to decrease. Moreover, the recovery rate of vanadium in pig iron has a rising trend with increasing the optical basicity of the slag. The addition of MgO in the slag to increase the slag......
by water and dilute acid separately after being roasted with different dosage of Na Cl. The water leaching rate of vanadium(WLRV) was low and only 26.8% of vanadium can be leached by water when 4% Na Cl was added, but the acid leaching rate of vanadium(ALRV) was relatively high. Calcium in the high calcium type stone coal is greatly superfl uous relative to vanadium, hence, the calcium reacts......
制酸废催化剂回收钒王晓丹1,朱云1(1.云南省昆明市昆明理工大学材料与冶金工程学院)摘 要:用硫酸浸出-P204萃取工艺从制酸废催化剂中回收钒.结果表明,在浸出条件为硫酸浓度50g/L,液固比2∶1,时间30min时,钒的浸出率可达95%.浸出液经过P204萃取,饱和NaHCO3溶液反萃,反萃液净化,铵盐沉钒,偏钒酸铵热分解后得到了合格的V2O5.关键词:冶金技术； 钒； 硫酸浸出； 制酸废催化剂......
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with the model: v=1.87t-0.54, indicating that the leaching rate of Cr(Ⅵ) declines in an exponential order of -0.54. Key words: chromium-containing slag; Cr(Ⅵ) leaching; leaching rate; dynamic model ...? CaCrO4 have slow diffusion rate[13]. Previous research demonstrated that decreasing pH value and increasing pressure and temperature could promote Cr(Ⅵ) leaching[11]. Moreover, CaCrO4·Ca2SiO4·CaCrO4......
of Guangxi, the leaching rate of vanadium of static roasting and fluidized roasting in the same roasting and acid leaching condition was compared. The results show that the leaching rate of vanadium...% and addition of hydrofluoric acid 2%. Under the optimal acid leaching conditions, the rate of leaching vanadium can reach 88.26%. Key words: vanadium; high-carbon stone coal; oxidizing roasting; acid......
. It was determined that the concentration of sulphuric acid and stirring speed above 800 r min 1 did not significantly affect vanadium extraction. The dissolution rate increased with increasing temperature.... The leaching mechanism was confirmed by characterizing vanadium trioxide and the dissolution residue using SEM-EDS analysis. Combined with thermodynamic calculation, the pressure leaching of vanadium......
铝酸钠溶液沉钒渣中钒的湿法回收冯其明1,邵延海2,欧乐明1,张国范2,卢毅屏2(1.湖南省长沙市中南大学资源加工与生物工程学院2.昆明理工大学 国土资源工程学院,昆明 650093)摘 要:通过沉钒渣物相分析,提出从沉钒渣中回收钒的浸出-净化-铵盐沉钒湿法工艺.结果表明,采用碳酸氢钠浸出沉钒渣,在NaHCO3与Ca3(VO4)2摩尔比为11,反应温度80℃,反应时间45min,固液比1∶4,搅拌速度800r/min条件下,钒的浸出率达96.4%.含钒浸出液中分步添加30%硫酸和硝酸镁,Al,Si,P,As等杂质......
Vanadium Defects Formation Mechanism in Undoped GaN Grown on Silicon Hao Qiuyan1,Zhang Wei1,Teng Xiaoyun1,Sun Shilong1,Liu Caichi1,Zhao Liwei1 (1.School of Material Science and Engineering, Hebei... the concentration of C atoms, furthermore, slow growth rate on those {10-11} planes are suggested as being responsible for the initiation of V defects. The formation mechanism of V defects was discussed. Key......
, and there are different reaction models in different reaction stages. Key words: pyrolusite; microbial leaching; leaching rate of MnO2; electrochemistry 锰是一种重要工业原料,广泛应用于钢铁,各种合金,电子材料,农牧和其他化工产品,在国民经济中...; 文章编号:1672-7207(2015)08-2791-06 Effects of H+ and Fe3+ on reaction in microbial leaching process of low-grade pyrolusite ZHANG Xu1, 2, FENG Yali1, LI Haoran2, RAO......
