Characterization of Waste and Reclaimed Green Sand Used in Foundry Processing

Khan, Mohd Moiz; Singh, Manvendra; Jadhav, G.N.; Mahajani, Sanjay M.; Mandre, Shashank

doi:10.1007/s12633-019-00146-0

Cited by 18 publications

(4 citation statements)

References 15 publications

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“…Typically, sand strength is affected by the particle size, size distribution, shape, and storage humidity as well as the amount of binder and the pH value on the sand surface [28][29][30]. Fig.…”

Section: Afs and Particle Size Distributionsmentioning

confidence: 99%

“…This indicated that the dehydration condensation reaction did not occur, even when the cured binder was reheated, i.e., no bridges were formed between the sand particles, similar to the new binder. Therefore, because the residual binder on the regenerated sand became an impurity, the core strength of the regenerated sand with residual binder was comparatively lower [30].…”

Section: Flexural Strengthmentioning

confidence: 99%

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Wet regeneration of waste artificial sand used in sand casting using chemical solutions

Kim

Baek

et al. 2020

Environmental Engineering Research

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Natural sand and organic binders have been the main materials used in sand casting. However, inorganic binders are used in novel casting technologies, and research on artificial sand as a substitute of natural sand has been conducted. Herein, the wet regeneration of waste artificial sand was performed using a sodium silicate binder. Acidic, neutral, and basic solutions were used for wet regeneration. The effects of binder removal and reusability of the regenerated sand were investigated by comparing the characteristics and strengths of the artificial and regenerated sand. It was demonstrated that the basic solution effectively removed the binder from the surface of the waste artificial sand. The Si-O-Si bond cleavage in the binder occurred due to the high concentration of hydroxide ions in the basic solution. The strength of the regenerated sand treated with the basic solution and that of the artificial sand were similar. Moreover, the strengths of regenerated sands treated with the acidic or neutral solutions were lower than that of artificial sand due to the presence of residual binder. These results indicated that the basic solution was suitable for removing the sodium silicate binder. The quality of the regenerated sand was similar to that of artificial sand.

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Section: Afs and Particle Size Distributionsmentioning

confidence: 99%

Section: Flexural Strengthmentioning

confidence: 99%

Wet regeneration of waste artificial sand used in sand casting using chemical solutions

Kim

Baek

et al. 2020

Environmental Engineering Research

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“…The process of reclaiming spent moulding sand was described in [ 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 ]. The mechanical reclamation of used grain matrix was addressed in [ 32 , 33 , 34 ]. Issues that are related to thermal reclamation (the thermal destruction of organic binders on the grain matrix) are presented in [ 35 , 36 , 37 , 38 , 39 , 40 , 41 ].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Reclamation of Spent Moulding Sand on Chromite Sand Matrix; Removal of Alkali-Phenolic Binder

et al. 2023

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The foundry industry generates large amounts of waste when casting metal into sand moulds. An important issue is the activities that are related to the re-recovery of the grain matrix (the main component of the moulding sand) for realising subsequent technological cycles. This process is particularly important in the case of the expensive chromite matrix that is necessary for use in manganese steel casting. The effects of the reclamation treatments of spent alkali-phenolic binder sand were evaluated by scanning electron microscopy with EDS, analysing the chemical composition in micro areas and proving the loss of binder on the surfaces of the matrix grains. Tests were also performed using the main criteria for evaluating a reclaimed organic binder: sieve analysis and ignition loss. A thermogravimetric analysis study was performed to assess the change in the chromite character of the grain matrix under the influence of temperature. The effects of the reclamation measures were verified by making moulding compounds on a matrix of reclaimed sand and a mixture of reclaimed and fresh sand. The tests and analyses that were carried out indicated the direction of an effective method for reclaiming used alkali-phenolic binder masses and the extent of the proportion of the regenerate in moulding sand in order to maintain the relevant technological parameters of the moulding sand.

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“…The reclamation of used sand is necessary, whether from the aspects of resource conservation or environmental protection. At present, the main reclamation processes of used foundry sand include dry, wet, and hot reclamation processes, thermal reclamation is the most widely accepted mode of sand reclamation 8 . Moreover, thermal reclamation is the most effective method for using sand with binders attached to the surface.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation and improvement of combustor structure in 3D printed sand recycling system

Gao,

Lei,

2023

Polish Journal of Chemical Technology

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In this paper, a new combustor with an output of 5 t/h is designed based on a computational particle fluid dynamics (CPFD) model. The flow field simulation is combined with the combustion simulation to analyze the internal two-phase flow, temperature field, and combustion products. The combustor structure was optimized. The simulation results show that the recovery efficiency of the waste sand and the energy utilization of the combustor can be improved under the original structure. The sand bed has a significant effect on flow field characteristics. The increase in particle temperature in the combustor increases the efficiency of waste sand recovery by increasing the height of the sand bed by 50 mm. The utilization rate of natural gas is increased and the economic efficiency is improved. The feasibility of the CPFD method can simulate the flow field characteristics inside the combustor very effectively.

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Characterization of Waste and Reclaimed Green Sand Used in Foundry Processing

Cited by 18 publications

References 15 publications

Wet regeneration of waste artificial sand used in sand casting using chemical solutions

Wet regeneration of waste artificial sand used in sand casting using chemical solutions

Mechanical Reclamation of Spent Moulding Sand on Chromite Sand Matrix; Removal of Alkali-Phenolic Binder

Numerical simulation and improvement of combustor structure in 3D printed sand recycling system

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