CAJ | 학술논문

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。
연구일충선택성탈제범태사중이양화규적공예。이용XRD、SEM화EDS대범태사화감침출후적양품진행표정。결과표명：범태사적주요조분시흑태석、휘석화금속철。흑태석위판상화과립상，분포우휘석중；금속철위구형，정연충상피포과우휘석화흑태석중，변연피양화；규주요분포재휘석중；태화범주요분포재흑태석중。대교반속도、침출온도、침출시간、NaOH농도화액고비대침출적영향진행연구。결과표명：침출온도화액고비대SiO2적침출솔유교대적영향，재최가실험조건하，Si、Al、Mn화V적침출솔분별위88.2%、66.3%、27.3%화1.2%。범태사감침탈규동역학과정수화학반응공제，기표관활화능위46.3 kJ/mol。
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 energy of the desilication process was found to be 46.3 kJ/mol.