Recycling water glass from wet reclamation sewage of waste sodium silicate-bonded sand

Wang, Li-chi; Jiang, Wenming; Gong, Xiaolong; Liu, Fuchu; Zhao, Fan

doi:10.1007/s41230-018-8165-4

Cited by 15 publications

(9 citation statements)

References 10 publications

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“…Based on the recorded thermogravimetric analysis data for the A1 binder, the systems of Equations ( 10) and ( 11) were determined. TG = −0.3595 × T + 217.9, R = 0.9994 Based on the recorded thermogravimetric analysis data for the A1 binder, the systems of Equations ( 10) and (11) were determined. TG air = −0.3595 × T + 217.9, R 2 = 0.9994 TG Ar = −0.0159 × T + 57.269, R 2 = 0.9979 (10) TG air = −0.3652 × T + 314.99, R 2 = 0.9694 TG Ar = −0.0159 × T + 57.269, R 2 = 0.9979 (11) The solution to Equation ( 10) is the onset of the burning temperature of the binder of T s = 468 • C, while from Equation (11) for A1 binder, the temperature that is needed for the burning of T b = 738 • C can be determined (Figure 6).…”

Section: Resultsmentioning

confidence: 99%

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Selection of Effective Temperature for Thermal Regeneration of Spent Alkali-Phenolic Binder Moulding Sand

Łucarz

2023

Materials

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This article presents the results of research on alkali-phenolic binders used in moulding sands. The results of the presented experiments are part of a search for the optimum conditions to implement the thermal regeneration of spent alkali-phenolic binder moulding sands. The cured binders were subjected to thermogravimetric analysis in aerobic and anaerobic atmospheres. On the basis of the resin decomposition curves, the integral polymer decomposition temperature was determined, and the required thermal regeneration temperature for the alkali-phenolic binder moulding sands that were used was determined according to a specific procedure. The spent moulding sand was subjected to roasting procedures at different temperatures in order to confirm the necessary regeneration temperatures. The effects of the procedures that were carried out were evaluated by means of weight losses and ignition losses, microscopic pictures were taken, and using scanning microscopy, an analysis of the chemical composition in the micro areas on the surfaces of the matrix grains was carried out using scanning microscopy. The indicators for the comparisons between the individual binders were also calculated from the mass losses. The research and analysis that were carried out made it possible to indicate the required temperature for the thermal regeneration of the spent alkali-phenolic binder moulding sand to reduce the involved energy expenditure. The factors that can determine the successful implementation of the process and the obtaining of the best possible grain matrix for reuse were also indicated.

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Section: Resultsmentioning

confidence: 99%

“…Each of these methods has its own advantages, and each has its own disadvantages and areas of application. In [9][10][11], the authors present grain matrix recovery methods using the wet method. The authors of have presented various solutions for mechanical reclamation.…”

Section: Introductionmentioning

confidence: 99%

Selection of Effective Temperature for Thermal Regeneration of Spent Alkali-Phenolic Binder Moulding Sand

Łucarz

2023

Materials

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“…36 Remaining sodium silicate are not decomposed or burned out in the casting process but instead they form a sodium silicate gel. 37 This has low melting point and strong bond strength with the sand. Residual binder and salt on the sand absorb water easily which makes dry reclamation difficult.…”

Section: Discussionmentioning

confidence: 99%

Experimental Study of Inorganic Foundry Sand Binders for Mold and Cast Quality

2022

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The interest in inorganic foundry binders has been rising steadily in recent times due to their favorable environmental characteristics. This paper compares the mold quality and cast quality attained with different inorganic binders. Three different types of sand and five different inorganic binders were used for the mold quality study. Of the inorganic binders, there was liquid sodium silicate used in different hardening methods, a geopolymer binder, and also solid sodium silicate. The mold quality was assessed through bending strength, residual bending strength, tensile strength, and loss on ignition measurement. A total of 12 castings were made using molds of different binders and sand materials. The cast quality was then assessed by tracking changes in dimension and the surface quality of final castings. Inorganic binders performed well in terms of mold strength and very well in terms of loss on ignition but there is room for improvement in the surface quality of the castings attained.

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“…There are three basic grain matrix recovery methods that are used: wet in water is used mainly for bentonite and water glass moulding sands; mechanical is for all types of spent moulding and core sands; thermal is for burnt binders. Due to the costs of infrastructure and water and energy consumption, wet regeneration is rarely used [1][2][3][4]. Depending on the type of binder material, the other methods are applied using different equipment.…”

Section: Introductionmentioning

confidence: 99%

Thermal Regeneration of Spent Sand with Furfuryl Binder from an Ecological and Economic Point of View

Łucarz,

Dereń

2023

Materials

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The recovery of the grain matrix from spent moulding sand is a constant challenge in making the best possible use of the deposits of quartz sand material, as well as in protecting them. In the case of spent sand with organic binders, the best method to recover the grain matrix is thermal regeneration. However, this method is expensive and requires adequate attention to the emission of harmful compounds into the atmosphere. This paper presents a new concept for implementing the thermal regeneration process. A suitable regeneration temperature was adopted for the furfuryl binder moulding sand, and a change in the design of the device was introduced in the area of the utilisation of gases generated during the combustion of the spent binder. To confirm the assumptions made, and to assess the appropriate suitability of the material recovered, the technological parameters of the material obtained were verified, namely, ignition losses, sieve analysis, bending strength, and pH value. The consumption of media for the process was also analysed from an economic point of view, as well as the emission of BTEX (a mixture of volatile aromatic hydrocarbons-benzene, toluene and three isomers of xylene) gases under different conditions of the process. On the basis of the research conducted, it was concluded that lowering the regeneration temperature of regeneration does not adversely affect the technological parameters of the moulding sand on the regenerate matrix. Changing the design of the regenerator does not result in increased emissions of harmful substances to the environment. Studies indicate that the appropriate setting of thermal regeneration parameters and the optimal design of the employed equipment are favourable factors in reducing the cost of the process while not compromising the quality of the moulding sand and the environmental impact.

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Recycling water glass from wet reclamation sewage of waste sodium silicate-bonded sand

Cited by 15 publications

References 10 publications

Selection of Effective Temperature for Thermal Regeneration of Spent Alkali-Phenolic Binder Moulding Sand

Selection of Effective Temperature for Thermal Regeneration of Spent Alkali-Phenolic Binder Moulding Sand

Experimental Study of Inorganic Foundry Sand Binders for Mold and Cast Quality

Thermal Regeneration of Spent Sand with Furfuryl Binder from an Ecological and Economic Point of View

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