Synthesis of Ti(C, N, O) ceramic from rutile at low temperature by CH4-H2-N2 gas mixture

Fan, Gangqiang; Hou, Youling; Huang, Dejun; Dang, Jie; Zhang, Run; Xiang, Junyi; Lv, Xuewei; Ding, Xiaoming

doi:10.1016/j.ijrmhm.2021.105659

Cited by 8 publications

(6 citation statements)

References 47 publications

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“…It is found that the weight loss rate is small when using Ar as protective gas, indicating that N 2 increases the carbonization reduction of TiO 2 and the formation of Ti(C, N). Fan et al [22][23][24] also confirm that when rutile is reduced by CH 4 -H 2 , the introduction of N 2 apparently increases the reduction rate, with the complete reduction time decreasing from 8 hours in CH 4 -H 2 gas mixture to 3 hours in CH 4 -H 2 -N 2 gas mixture. To sum up, N 2 has an accelerating effect on the reduction of TiO 2 and the formation of Ti(C, N).…”

Section: Effect Of Top Gas Recycling Technology On the Softening Melt...mentioning

confidence: 90%

“…The added N 2 in reducing gas promotes the formation of the solid particle Ti(C, N) with high melting point ( > 2 950°C) in molten slag. [20][21][22][23][24] As shown in Fig. 7, based on the composition of the dropping slag obtained from the SMD test without N 2 ratio, the thermodynamic effects of different N 2 partial pressures on the reduction of TiO 2 in slag to TiN and TiC are calculated by FactSage 8.0 ( P P N total 2 0 0 6 = − .…”

Section: Discussionmentioning

confidence: 99%

“…The microstructure and element distribution of the residual slag also indicate that the introduction of N 2 promotes the formation of Ti(C, N). [20][21][22][23][24] As presented in Fig. 8, the erosion of coke by slag is intensified as the increasing N 2 concentration.…”

Section: Discussionmentioning

confidence: 99%

“…Secondly, the deterioration of the gas permeability of the V-Ti bearing burden with the increasing N 2 concentration is also attributed to the N 2 promoting the formation of Ti(C, N). [20][21][22][23][24] In stage Ⅰ of the pressure drop curve, the increase in N 2 concentration causes more Ti(C, N) to be generated by the reaction of slag and coke (Fig. 8).…”

Section: Discussionmentioning

confidence: 99%

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Effect of Top Gas Recycling Technology on the Softening, Melting and Dropping Behavior of V–Ti Bearing Burden in COREX Process

et al. 2022

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In COREX process, the top gas recycling (TGR) is an effective recovery and utilization technology for the high-quality gas by-produced from the melter gasifier, which can reduce its fuel consumption and emissions, and is of great significance to low carbon ironmaking. However, low concentration N 2 is contained in the top gas, it is unfavorable to the smelting of V-Ti bearing burden because the high temperature solid solution Ti(C, N) is formed in the semi-coke bed and deteriorates the burden permeability of the melter gasifier. The effect of N 2 concentration (0-10 vol%) on the softening, melting and dropping behavior of V-Ti bearing burden is investigated under simulated COREX conditions. Results show that the increasing N 2 concentration will promote the formation of Ti(C, N), increase the slag viscosity and its wettability to coke, greatly increase the burden dropping temperature, which reduces the slag dropping rate from 68.2% to 18.8%. In addition, slag foaming is caused and the gas permeability of V-Ti bearing burden is deteriorated. The vanadium contents of dropping iron and residual iron are decreased from 0.051 wt% and 0.166 wt% to 0.043 wt% and 0.161 wt%, when the N 2 concentration in reducing gas changes from 0 vol% to 10 vol%. If the pressure drop needs to be controlled below 20 kPa, the N 2 concentration in the reducing gas should not exceed 5 vol%, that is, the top gas injection volume should be less than 60%.

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Section: Effect Of Top Gas Recycling Technology On the Softening Melt...mentioning

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Effect of Top Gas Recycling Technology on the Softening, Melting and Dropping Behavior of V–Ti Bearing Burden in COREX Process

et al. 2022

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“…Zhang et al showed that a mixture of methane and hydrogen can completely reduce TiO 2 to TiC x O y at 1350 • C for 8 h [22]. Methane is easily decomposed into carbon and hydrogen with increasing temperature, and carbon deposition causes the reaction to be hindered when the rate of methane decomposition is higher than the reaction [22][23][24]. The decomposition rate of methane cannot be determined, which makes it difficult to control the amount of carbon in the reduction process.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Titanium Carbide by Carburisation of Titanium Dioxide

Lv,

Tian,

2024

Processes

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Titanium carbide has attracted widespread attention due to its excellent properties. This study investigates the process of carbon thermally reducing TiO2 to prepare TiC through a combination of thermodynamic analysis and experiments. The effects of temperature, TiO2/C molar ratio, and time on the phase transformation and morphology evolution of the products are investigated. The synthesis of titanium carbide involves the main reduction path of TiO2–Magnéli–Ti3O5–Ti2O3–TiCxO1−x. With the increase in reaction temperature and TiC content, the microstructure transitions from a smooth disc-like structure to a loose and porous layered structure, while the particle size decreases significantly. The carburisation rate of the reduced product is more affected by temperature, according to chemical analysis. The carburisation rate increased from 18.37% to 36.09% for 2 h–10 h of holding time at 1400 °C, and from 51.43% to 77.57% for 2 h–10 h of holding time at 1500 °C. The quantification of the carburisation rate provides a valuable reference for the preparation of titanium carbide by TiO2.

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