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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。
A selective removal of vanadium titanium slag in the process of silica. The vanadium-titanium slag and alkali-leached samples were characterized by XRD, SEM and EDS. The results show that the main components of vanadium-titanium slag are black titanium stone, pyroxene and metallic iron. Black titanium is plate-like and granular, distributed in pyroxene; metal iron is spherical, worm-like was wrapped in pyroxene and black titanium stone, the edge is oxidized; silicon is mainly distributed in pyroxene; titanium and vanadium Mainly distributed in black titanium stone. The effects of stirring speed, leaching temperature, leaching time, NaOH concentration and liquid-solid ratio on leaching were studied. The results show that the leaching temperature and liquid-solid ratio have great influence on the leaching rate of SiO2. Under the optimum conditions, the leaching rates of Si, Al, Mn and V are 88.2%, 66.3%, 27.3% and 1.2% . The kinetics of silicon removal by vanadium-titanium dross alkali is controlled by chemical reaction and its apparent activation energy is 46.3 kJ / mol.