A simple methodology based on numerical analysis for the drying curve design of a castable lined steel ladle

Cunha, T.M.; Moreira, M.H.; Santos, M.F.; Angélico, Ricardo Afonso; Pandolfelli, V. C.

doi:10.1016/j.oceram.2023.100330

Open Ceramics

2023

DOI: 10.1016/j.oceram.2023.100330

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A simple methodology based on numerical analysis for the drying curve design of a castable lined steel ladle

T.M. Cunha

M.H. Moreira

M.F. Santos

et al.

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2024

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Cited by 2 publications

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Neutron tomography analysis of permeability‐enhancing additives in refractory castables

Moreira,

Pont,

Tengattini

et al. 2024

J Am Ceram Soc.

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Polymeric fibers are often used as a drying additive for refractory castables because they can increase their permeability, reducing the risk of pressurization that is believed to trigger explosive spalling. Despite the potential of synthetic polymers to be engineered and obtain desired properties, the required parameters for inducing permeability enhancement remain unclear. This inhibits the development of novel designed drying additives and improvement of the numerical models. This work investigates the effect of polypropylene (PP), polyethylene (PE) and cellulose fibers on the water transport in refractory castables through rapid neutron tomography, enabling the in situ visualization of the water distribution, the drying front advance and the size, intensity and duration of moisture accumulation. PE and cellulose fibers accelerate drying fronts earlier than PP, in which PE exhibits larger moisture accumulation, residual moisture behind its drying front and a slower drying rate at higher temperatures despite the early water removal initiation. In contrast, cellulose emerged as a better candidate, due to a swelling–shrinkage based mechanism. The neutron tomography observations unveil the dynamic and intricate effect of fibers in the permeability, emphasizing that safer industrial processes require a deeper understanding of the underlying mechanisms to develop better fibers and accurate numerical models.

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Neutron tomography analysis of permeability‐enhancing additives in refractory castables

Moreira,

Pont,

Tengattini

et al. 2024

J Am Ceram Soc.

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Experimental Study on the Effect of Calcium Aluminate Cement Addition on the Drying and Physical Properties of Refractory Castables Containing Colloidal Silica

Piippo,

Ruotanen,

Visuri

et al. 2024

Materials

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Colloidal silica-bonded castables offer several advantages compared to traditional calcium aluminate cement (CAC)-bonded castables, including lower torque values during mixing, superior drying properties, and a lower CaO content. Nevertheless, information on the combination of CAC and colloidal silica is limited, and the effect of CAC additions on the drying properties of colloidal silica-bonded castables remains unknown. In this study, these drying properties were measured by rapidly heating 400 kg samples to 500 °C and assessing the resulting damage to each sample. Additionally, the physical and chemical properties of small-scale samples were analyzed to evaluate the impact of CAC addition. The analyzed properties included cold crushing strength (CCS), density, permanent linear change (PLC) and weight loss. The microstructure of the samples was investigated by FESEM and EDS. The results indicate that adding 1.5 wt.% increased the cold crushing strength at 20 °C, while lower CAC amounts had no noticeable effect. A mullite phase was observed in the sample without CAC, and correspondingly, anorthite was found in those with CAC additions. The samples exhibited significant differences in the drying tests, with the degrees of damage increasing with the CAC addition.

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A simple methodology based on numerical analysis for the drying curve design of a castable lined steel ladle

Cited by 2 publications

References 18 publications

Neutron tomography analysis of permeability‐enhancing additives in refractory castables

Neutron tomography analysis of permeability‐enhancing additives in refractory castables

Experimental Study on the Effect of Calcium Aluminate Cement Addition on the Drying and Physical Properties of Refractory Castables Containing Colloidal Silica

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