A two-stage oxidation—alkali leaching—acid leaching method was proposed to recovery Fe,V,and Ti in modified Ti-bearing blast furnace slag.The optimal experiment conditions of iron extraction were one-stage oxidation...A two-stage oxidation—alkali leaching—acid leaching method was proposed to recovery Fe,V,and Ti in modified Ti-bearing blast furnace slag.The optimal experiment conditions of iron extraction were one-stage oxidation time 40 s and holding time 8 min.The recovery rate of iron was 89.93%.The optimum experiment conditions of vanadium extraction were total oxidation time of 126 s,NaOH concentration of 4.0 mol/L,leaching temperature of 95℃,leaching time of 90 min,and the number of cycle was 4.The leaching rate of vanadium was 92.13%.The optimal experiment conditions of titanium extraction were HCl concentration of 4.5 mol/L,leaching temperature of 75℃,and leaching time of 90 min.The TiO_(2)content of synthetic rutile was 98.61%.展开更多
The effect of rutile crystal shapes on its settlement in a modified slag was studied by theoretical analysis,FactSage simulation,X-ray diffraction and scanning electron microscopy.The results show that the settling ve...The effect of rutile crystal shapes on its settlement in a modified slag was studied by theoretical analysis,FactSage simulation,X-ray diffraction and scanning electron microscopy.The results show that the settling velocities of spherical rutile crystals are faster than those of other shapes of rutile crystals under the same volume conditions,and the shape transformation of rutile crystals from rod to sphere can be achieved by adding titanium slag to Ti-bearing blast furnace slag.The volume fractions of the rutile crystals in the upper and lower parts of the modified slag are 30%and 71%when the added titanium slag increases to 278 g,indicating that rutile settling is obvious.Due to the rutile settling,half shaker sorting task is saved,and the recovery rate of TiO2 is significantly increased.The TiO2 content of rutile is greater than 93%,and the total content of CaO and MgO is less than 0.4%,meeting the requirements for the raw materials of titanium white in the chloride process.展开更多
基金financial support from the National Science and Technology Support Program of China(No.2015BAB18B00)。
文摘A two-stage oxidation—alkali leaching—acid leaching method was proposed to recovery Fe,V,and Ti in modified Ti-bearing blast furnace slag.The optimal experiment conditions of iron extraction were one-stage oxidation time 40 s and holding time 8 min.The recovery rate of iron was 89.93%.The optimum experiment conditions of vanadium extraction were total oxidation time of 126 s,NaOH concentration of 4.0 mol/L,leaching temperature of 95℃,leaching time of 90 min,and the number of cycle was 4.The leaching rate of vanadium was 92.13%.The optimal experiment conditions of titanium extraction were HCl concentration of 4.5 mol/L,leaching temperature of 75℃,and leaching time of 90 min.The TiO_(2)content of synthetic rutile was 98.61%.
基金Project(2015BAB18B00)supported by the National Science and Technology Support Program of China。
文摘The effect of rutile crystal shapes on its settlement in a modified slag was studied by theoretical analysis,FactSage simulation,X-ray diffraction and scanning electron microscopy.The results show that the settling velocities of spherical rutile crystals are faster than those of other shapes of rutile crystals under the same volume conditions,and the shape transformation of rutile crystals from rod to sphere can be achieved by adding titanium slag to Ti-bearing blast furnace slag.The volume fractions of the rutile crystals in the upper and lower parts of the modified slag are 30%and 71%when the added titanium slag increases to 278 g,indicating that rutile settling is obvious.Due to the rutile settling,half shaker sorting task is saved,and the recovery rate of TiO2 is significantly increased.The TiO2 content of rutile is greater than 93%,and the total content of CaO and MgO is less than 0.4%,meeting the requirements for the raw materials of titanium white in the chloride process.
