Study of Lime Dissolution Under Forced Convection

Deng, Tengfei; Sichen, Du

doi:10.1007/s11663-011-9629-8

Cited by 29 publications

(36 citation statements)

References 3 publications

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“…14). 26) In this method, molten slag with a lime cube was stirred by a bar moving circularly. After stirring for a given time, the crucible containing the slag and lime cube was quenched and cut to measure the size of the residual cube.…”

Section: J St Scmentioning

confidence: 99%

“…15. 26) In this experiment, the dissolution rate of the lime cube was evaluated by Eq. They also showed the detachment of dicalcium silicate from the lime surface and concluded that the mechanical separation of this layer had an important role in the dissolution.…”

Section: J St Scmentioning

confidence: 99%

“…Over these ten years, a lot of research has been conducted with dynamic tests, [26][27][28][29]32) stagnant tests, [33][34][35] theoretical modelling, 36) and process simulation to consider the slagging behavior. 37,38) This indicates that the dissolution of lime is still one of the unsolved subjects in steelmaking reactions.…”

Section: Conclusion and Remarksmentioning

confidence: 99%

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Dissolution Behavior of Lime into Steelmaking Slag

Kitamura

2017

ISIJ International

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Many studies have been conducted over the last 50 years or more to clarify the dissolution behavior of lime in slag. In this paper, the previous studies on enhancing the dissolution of lime are reviewed. The research subject is divided into industrial tests to verify the new technology, and laboratory tests to clarify the dissolution mechanism. To enhance the dissolution, the only feasible measure is to increase the interfacial area. For this purpose, various methods to increase surface area have been tried, including the decrease in lime size; powder blowing or injection; controlling the calcination conditions; and application of a pre-melted flux. Among them, powder blowing and the reuse of the refining slag are the most effective measures. For fundamental experiments, the immersion of a rotation rod in the slag, immersion of lime cube with a circular rotating rod, and the addition of lime to the slag under gas bubbling have been conducted. The mechanism and rate-controlling step of lime dissolution have become clear: the destruction of the dicalcium silicate layer is important to promote the dissolution of lime. Stirring-promoted fluid flow and the formation of CO 2 inside of the quick lime are proposed as mechanisms of the destruction.

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Section: J St Scmentioning

confidence: 99%

Section: J St Scmentioning

confidence: 99%

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Dissolution Behavior of Lime into Steelmaking Slag

Kitamura

2017

ISIJ International

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“…[4][5][6][7] The type of silicates formed depends on slag conditions (primarily slag basicity and FeO content). In the current study, it is assumed that the reaction between solid CaO and SiO 2 in slags results only in the formation of solid 2CaOAESiO 2 which forms a layer around the unreacted core of CaO.…”

Section: Model Formulationmentioning

confidence: 99%

A Model for Dissolution of Lime in Steelmaking Slags

Sarkar

Roy

Ghosh

2016

Metall Mater Trans B

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In a previous study by Sarkar et al. (Metall. Mater. Trans. B 46B:961 2015), a dynamic model of the LD steelmaking was developed. The prediction of the previous model (Sarkar et al. in Metall. Mater. Trans. B 46B:961 2015) for the bath (metal) composition matched well with the plant data (Cicutti et al. in Proceedings of 6th International Conference on Molten Slags, Fluxes and Salts, Stockholm City, 2000). However, with respect to the slag composition, the prediction was not satisfactory. The current study aims to improve upon the previous model Sarkar et al. (Metall. Mater. Trans. B 46B:961 2015) by incorporating a lime dissolution submodel into the earlier one. From the industrial point of view, the understanding of the lime dissolution kinetics is important to meet the ever-increasing demand of producing low-P steel at a low basicity. In the current study, three-step kinetics for the lime dissolution is hypothesized on the assumption that a solid layer of 2CaOAESiO 2 should form around the unreacted core of the lime. From the available experimental data, it seems improbable that the observed kinetics should be controlled singly by any one kinetic step. Accordingly, a general, mixed control model has been proposed to calculate the dissolution rate of the lime under varying slag compositions and temperatures. First, the rate equation for each of the three rate-controlling steps has been derived, for three different lime geometries. Next, the rate equation for the mixed control kinetics has been derived and solved to find the dissolution rate. The model predictions have been validated by means of the experimental data available in the literature. In addition, the effects of the process conditions on the dissolution rate have been studied, and compared with the experimental results wherever possible. Incorporation of this submodel into the earlier global model (Sarkar et al. in Metall. Mater. Trans. B 46B:961 2015) enables the prediction of the lime dissolution rate in the dynamic system of LD steelmaking. In addition, with the inclusion of this submodel, significant improvement in the prediction of the slag composition during the main blow period has been observed.

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“…15,23,24) This gas formation is caused by the thermal decomposition of a CaCO 3 core that exists in the center of added quicklime particles. Deng et al measured the dissolution rate of limestone (CaCO 3 ) in steelmaking slag, 25,26) and they concluded that the addition of limestone to a molten slag instead of quicklime particles is unfavorable, because the dissolution rate of limestone is low in spite of gas formation from the limestone. Therefore, it is considered that CaCO 3 may exist as a core in quicklime particles for rapid dissolution in the molten slag.…”

Section: Introductionmentioning

confidence: 99%