Papers by Keyword: Titanium Slag

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Authors: Feng Xia Han, Xiu Li Sang, Jian Xin Xu
Abstract: There were two controlling factors, which should be kept balance of raw input and energy during titanium slag smelting in closed high power direct current electric arc furnace, DC furnace for short. The first factor contains compositions and ratio of input raw materials. Compositions of the raw could influence the progress and technical indicators of DC furnace smelting, and on the meanwhile, it could determine the compositions of impurity and contents of TiO2 in titanium slag. On the other hand, the ratio of input infected the compositions of the slag, while too much anthracite would disadvantage to produce high quality slag because of impurity being reduced continually. Meanwhile much more low-state titanium would be generated. The second factor was an important one that energy equilibrium, which influence the production safety of DC furnace. It could keep balance of input and output energy, while the heatloss was 4.971 MVA. While the ratio of anthracite remained the same, the energy would effect slag viscosity and equilibrium of freeze lining directly. The energy input higher than smelting need would result in burnthrough of furnace wall and hearth, on the contrary, lower than smelting need would bring about slagging difficulties. Consequently, raw input and energy must be kept dynamic balance in order to achieve high quality titanium slag and protect freeze lining.
Authors: Feng Xia Han, Ting Lei, Lin Zhou
Abstract: Energy balance and offgas utilization of ilmenite smelting in 30 MVA direct current electric arc furnace (DC furnace) of a Yunnan company were investigated to make sure safety production, and to save energy and reduce pollution. The total input energy in the DC furnace was 2,000 kWh per ton of ilmenite, in which 1,003.31 kWh per ton of ilmenite was used to carbothermic reduction and other energy was consumed as heatloss. Based on energy conservation, the whole system heatloss in physical production should be controlled at 1,000 kWh per ton of ilmenite. With high combustion heat, the offgas discharged from furnace after treatment could be used to ilmenite drying, anthracite drying, titanium slag drying, and casting ladle baking. The offgas design flow ranged from 5,000 to 8,000 Nm3/h with the mean of 6,500 Nm3/h. The combustion heat quantity of offgas in the plant was 82,160 MJ per hour, which could save 480,276.8 kWh of electrical energy per day, and thus lower carbon emission of the whole production line.
Authors: Hui Liu, Su Ping Cui, Jian Feng Wang, Song Ge Yang, Xue Li Wang, Cong Wei Liu
Abstract: This paper investigates the influence of triethanolamine (TEA) on strength development and hydration of cement pastes and mortars incorporated with titanium slag (50% by mass of the total cementitious materials). The techniques including isothermal calorimetry, non-evaporative water content, and mercury intrusion porosimetry (MIP) were employed to characterize the hydration process at varied ages. The results show that: 1) 0.01%~0.10% addition of TEA has a positive effect on the strength development of blended cement mortars with titanium slag indicated by improved compressive strength and tensile strength; 2) TEA leads to an increase of hydration degree determined by measurement of isothermal calorimetry and non-evaporable water content before 28 d; 3) the cumulative porosity of cement pastes incorporated with titanium slag was reduced by TEA. Therefore, 0.01%~0.10% addition of TEA promotes the hydration of titanium slag, then forming more condensed structures, thus enhance the strength development of blended systems.
Authors: Jian Hua Liu, Jing Long Chu, Tian Yan Xue, Yan Fang Han, Tao Qi
Abstract: In order to reduce the silicon content to the maximum allowed value for the production of high-purity titanium dioxide, a hydrometallurgical process on the desiliconization during alkaline leaching of titanium slag under atmospheric pressure was studied. The effect of leaching temperature, initial NaOH concentration, leaching time and mass ratio of alkali to slag, on the efficiency of silicon removal were investigated. The results show that when the mass concentration of NaOH is 30%, mass ratio of alkali to slag 3:1, the leaching temperature 120°C and the retention time about 120min, the content of silicon in solid is reduced to 0.45%. Simultaneously, the content of aluminum is reduced to 1.62%, without affecting the content of titanium. The kinetics on the desiliconization during alkaline leaching of titanium slag was carried out. The results show that under the leaching parameters mentioned above, the apparent activation energy is calculated to be 45.43kJ/mol.
Authors: Man Tang Ding
Abstract: Titanium concentrate and titanium slag were used to prepare high titanium ferroalloy to reduce cost. In the process, the 6-9% of aluminum consumption was replaced by magnesium. The reasonable slag system composition was used. The results indicate that the ferrotitanium of 75% [Ti] and [Al]<4% was prepared.
Authors: Yan Fang Han, Ti Chang Sun, Jie Li, Li Na Wang, Tian Yan Xue, Tao Qi
Abstract: NaOH solution was utilized in the molten salt reaction of titanium slag for investigating desiliconization effects. The thermodynamic behaviors of Si in the reaction system was examined to explore the impacts of molten salt reaction conditions on the conversion rates of the foreign substance Si and the target element Ti. On this basis, the influences of NaOH concentration, liquid-solid ratio, cleaning temperature and cleaning time on Si removing rate were discussed. The experimental results showed that, Si reacted with NaOH to produce sodium silicate was feasible in terms of thermodynamics within the temperature interval 400-1000K. 3Na2O•2SiO2, 2Na2O•SiO2 could stably exist under high reaction temperature. As the reaction time extended and temperature rose, the conversion rate of Si was increasing. In the process of Si removing by NaOH cleaning of molten salt reaction products, as NaOH concentration, liquid-solid ratio, cleaning temperature and cleaning time increased, Si removing rate became larger. The optimum alkali cleaning conditions were: NaOH concentration 150g/l, liquid-solid ratio 3:1, cleaning temperature 50°C and cleaning time 60min, then the desiliconization rate reached 61.16%.
Authors: Zhi Xia Zhang, Chang Qing Hu, Hang Yu Wei, Yu Zhu Zhang
Abstract: The influence of Titanium slag with different compositions on desulfurizing was investigated, and the influence reasons based on the experiments of viscosity was also analysed. Basicity and composition of the slag was optimum as follows: the basicity 1.15~1.2, the content of TiO2 under 7wt%, the content of MgO 10wt%~11wt%, the content of MnO2 0.5wt%, the content of Al2O3 under 11wt%.
Authors: Song Li Liu, Jun Yi Xiang
Abstract: Synthetic rutile is an important intermediate in the manufacture of titanium dioxide, sponge titanium, and other areas of chemical industry. Due to the limitation of raw material and technology, the production of Chinas synthetic rutile still cant meet the need. Using the low grade ilmenite ore as a raw material to manufacture high grade synthetic rutile is extremely urgent. The technology of producing synthetic rutile at home and abroad, the prospect of Chinas industrial process and some suggestions are introduced.
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