Effect of Propane Gas on Hot Metal Desulfurization by CaO Based Flux

Kikuchi, Naoki; Nabeshima, Seiji; Kishimoto, Yasuo

doi:10.2355/isijinternational.52.1809

Cited by 20 publications

(15 citation statements)

References 10 publications

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“…Fluid dynamics behavior on a stirred tank depends on different factors, such as impeller rotation speed, gas flow rate, impeller depth, gas injection position and others [2,9,10]. Even so, no remarkable difference is noticed when gas flow rate increases, Figure 3 and Figure 4.…”

Section: Mixing Timementioning

confidence: 98%

“…A reason for practicing reacting gas injection could be to maintain reducing conditions inside the bath (hydrocarbon gas injection) [2,6]. This sort of reactive gas injection could be effective if done from the impeller lateral faces or from ladle bottom.…”

Section: Gas/liquid Interactionmentioning

confidence: 99%

“…Hydrocarbon blowing is a technique that can benefit the desulfurization process, since it leads to decreasing oxygen activities in the bath [2]. It has been shown that propane injection in both KR and torpedo car can result in reduction of desulfurizing agent consumption.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An Evaluation of Gas Injection Effects in a Mechanically Stirred Hot Metal Desulfurization System

Torres¹,

Silva²,

Silva³

et al. 2017

Tecnologia Em Metalurgia Materiais E Mineração

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Physical modeling techniques have been used in order to assess the effects of gas injection as a means of optimizing mechanically stirred desulfurization processes. For such a 1:7 scale model of a 315 ton of a Kanbara reactor was built. The influence of gas injection on mixing times, gas -liquid interfacial kinetics and solid phase dispersion was evaluated. Gas injection can reduce mixing times up to 20% and can increase solid dispersion up to 40%. Gas liquid interaction is shown to be highly dependent on the gas injection location. In this regard injecting through the impeller or at the bottom of the ladle has been investigated. Gas injection can be beneficial to the desulfurization process. Keywords: Kanbara Reactor; Desulfurization; Gas injection; Stirred tank. UMA AVALIAÇÃO DOS EFEITOS DA INJEÇÃO DE GÁS EM UM SISTEMA MECANICAMENTE AGITADO DE DESSULFURAÇÃO DE FERRO GUSA ResumoTécnicas de simulação física foram utilizadas para analisar os efeitos da injeção de gás como modo de otimização de processos de dessulfuração mecanicamente agitados. Um modelo em escala 1/7, correspondente a um reator de 315ton de capacidade, foi desenvolvido. O estudo foi realizado por meio da análise do tempo de mistura, cinética de interação interfacial e qualidade da dispersão de escória. Resultados satisfatórios foram observados, como uma redução de até 20% do tempo de mistura e um aumento de 40% na dispersão de escória para o fundo da panela. A interação gás -líquido é altamente dependente do local de injeção de gás. A técnica possui grande potencial de otimização do processo.

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Section: Mixing Timementioning

confidence: 98%

Section: Gas/liquid Interactionmentioning

confidence: 99%

See 1 more Smart Citation

An Evaluation of Gas Injection Effects in a Mechanically Stirred Hot Metal Desulfurization System

Torres¹,

Silva²,

Silva³

et al. 2017

Tecnologia Em Metalurgia Materiais E Mineração

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“…Reuse of the disposed flux has been made in 2000s. Recently, Kikuchi et al 36) improved deS rate of KR with the addition of propane gas into and onto the hot metal bath around the impeller to decrease oxygen potential in the area where engulfment of deS flux occurs.…”

Section: Evolution Growth and Maturation Of Hot Metal Pretreatmentmentioning

confidence: 99%

Steelmaking Technology for the Last 100 Years: Toward Highly Efficient Mass Production Systems for High Quality Steels

Emi

2015

ISIJ International

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Progress of steelmaking technology in Japan over the last 100 years is overviewed covering hot metal pretreatment, primary steelmaking with open hearth furnaces, converters and electric arc furnaces, secondary refining of steel with degassers and ladle furnaces, and ingot-and continuous-casting.Key issues that contributed considerably to the progress of the unit processes are highlighted with scientific, technological and engineering breakthroughs involved. Also, systematization of the unit processes is depicted for optimizing full cost, productivity and quality of steel products to meet the constraints on the resources and socioeconomic demands of the steel market at times.Possible future development of steel technology is briefly commented on the basis of the above observation.

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“…Many studies focused on various aspects of this process with the aim of improving desulfurization efficiency, [2][3][4][5] for example, evaluation of dispersion by water model experiments, increasing dispersion by use of an eccentric impeller, increasing agitation power and optimizing the flux composition. On the other hand, from the viewpoint of reducing flux consumption and slag generation, further enhancement of the efficiency of the desulfurization reaction is necessary.…”

Section: Introductionmentioning

confidence: 99%

Powder Blasting in Hot Metal Desulfurization by Mechanical Stirring Process

Nakai¹,

Sumi²,

Kikuchi³

et al. 2017

ISIJ Int.

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The effect of adding CaO-based desulfurization flux on desulfurization efficiency in hot metal desulfurization by mechanical stirring was investigated. It was found that desulfurization flux dispersion is enhanced by powder blasting with a carrier gas. In this research, the behaviors of the desulfurization powder under different blasting conditions were investigated, and the optimum blasting conditions for achieving higher desulfurization efficiency were examined. The velocities of the gas jet and particles were measured by pressure measurement by the pitot tube technique and LDV (Laser Doppler Velocimeter), respectively. The results showed that the powder velocity was accelerated by the gas jet, which agreed with the calculated velocity. The condition of powder penetration into the hot metal was examined based on the calculations. As a result, the higher carrier gas flow rate, 200 Nl/min, was categorized as a penetrating condition, and the lower carrier gas flow rate, 100 Nl/min, was not a penetrating condition. The difference in the desulfurization behaviors under those carrier gas flow rate conditions is caused by the difference in the penetrating condition. Based on the obtained blasting conditions, powder blasting tests were carried out in 300 t-scale hot metal desulfurization, and desulfurization flux consumption was decreased by 19% compared with conventional top addition.

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Effect of Propane Gas on Hot Metal Desulfurization by CaO Based Flux

Cited by 20 publications

References 10 publications

An Evaluation of Gas Injection Effects in a Mechanically Stirred Hot Metal Desulfurization System

An Evaluation of Gas Injection Effects in a Mechanically Stirred Hot Metal Desulfurization System

Steelmaking Technology for the Last 100 Years: Toward Highly Efficient Mass Production Systems for High Quality Steels

Powder Blasting in Hot Metal Desulfurization by Mechanical Stirring Process

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