Desilication from titanium–vanadium slag by alkaline leaching  

钒钛渣碱浸脱硅(英文)

作　　者：陈德胜[1,2] 赵龙胜[1,2] 齐涛[1,2] 胡国平[1,2] 赵宏欣[1,2] 李洁[1,2] 王丽娜[1,2] 

机构地区：[1]中国科学院过程工程研究所湿法冶金清洁生产技术国家工程实验室,北京100190 [2]中国科学院过程工程研究所绿色过程与工程重点实验室,北京100190

出　　处：《Transactions of Nonferrous Metals Society of China》2013年第10期3076-3082,共7页中国有色金属学报（英文版）

基　　金：Project(51090380)supported by the Major Program of the National Natural Science Foundation of China;Project(51125018)supported by the National Science Foundation for Distinguished Young Scholars of China;Projects(51374191,51104139,21006115)supported by the National Natural Science Foundation of China

摘　　要：A hydrometallurgical process for the selective removal of silicon from titanium-vanadium slag by alkaline leaching was investigated. X-ray diffraction, scanning electron microscopy and electron dispersive spectroscopy were used to characterize the samples. The results show that anosovite, pyroxene and metallic iron are the major components of the titanium-vanadium slag. Anosovite is presented in granular and plate shapes, and pyroxene is distributed in the anosovite crystals. Metallic iron is spheroidal and wrapped in anosovite. Silicon is mainly in the pyroxene, and titanium and vanadium are mainly in the anosovite. The effects of agitation speed, leaching temperature, leaching time, sodium hydroxide concentration and liquid-solid （L/S） mass ratio on the leaching behavior of silica from titanium-vanadium slag were investigated. The leaching temperature and L/S mass ratio played considerable role in the desilication process. Under the optimal conditions, 88.2% silicon, 66.3% aluminum, 27.3% manganese, and only 1.2% vanadium were leached out. The desilication kinetics of the titanium-vanadium slag was described by the chemical control model. The apparent activation enerffv of the desilication orocess was found to be 46.3 kJ/mol.研究一种选择性脱除钒钛渣中二氧化硅的工艺。利用XRD、SEM和EDS对钒钛渣和碱浸出后的样品进行表征。结果表明:钒钛渣的主要组分是黑钛石、辉石和金属铁。黑钛石为板状和颗粒状,分布于辉石中;金属铁为球型,呈蠕虫状被包裹于辉石和黑钛石中,边缘被氧化;硅主要分布在辉石中;钛和钒主要分布在黑钛石中。对搅拌速度、浸出温度、浸出时间、NaOH浓度和液固比对浸出的影响进行研究。结果表明:浸出温度和液固比对SiO2的浸出率有较大的影响,在最佳实验条件下,Si、Al、Mn和V的浸出率分别为88.2%、66.3%、27.3%和1.2%。钒钛渣碱浸脱硅动力学过程受化学反应控制,其表观活化能为46.3 kJ/mol。

关 键 词：DESILICATION titanium-vanadium slag alkaline leaching KINETICS 

分 类 号：X756[环境科学与工程—环境工程]