Effect of natural zeolite addition on sintering kinetics of porcelain bodies

“…of zeolite-based porcelain bodies are similar to current traditional porcelain bodies made in the system kaolin-feldspar rock-quarz [20]. The aim of the study [21] was to investigate the efect of natural zeolite addition on the sintering kinetics. Clinoptilolite, which is a type of natural zeolite, was added partially or fully in replacement of quarz at selected electro-porcelain composition.…”

Section: Introductionmentioning

confidence: 99%

Sintering of Whiteware Body Depending on Different Fluxing Agents and Binders

Sokolar¹

2018

Sintering of Functional Materials

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The sintering of whiteware (porcelain) body can be afected by using luxing agents or binders. The chapter describes the sintering process of porcelain body in case of different luxing agent (diferent feldspar rocks, bone ash, zeolite) and binder (kaolin vs. calcium aluminate cement) utilization in the porcelain raw material mixture. Sintering process is presented according to thermodilatometrical curves and sintering temperatures especially.

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“…Mullite has achieved outstanding importance as a material for both traditional and advanced ceramics because of its favorable thermal and mechanical properties [14]. The use of natural zeolites in ceramic production has been evaluated by different research groups, highlighting the advantages, generally a lowering of sintering temperatures and limits, mainly linked to the dark color often observed in the fired products [15][16][17][18][19]. Recent papers show that crystalline materials can be obtained by thermally induced transformation of Cs-and Pb-exchanged clinoptilolite [20][21][22], whereas only an amorphous phase has been achieved from the thermal treatment of a NH 4 -clinoptilolite [23].…”

Section: Introductionmentioning

confidence: 99%

Thermal Transformation of NH4-Clinoptilolite to Mullite and Silica Polymorphs

2017

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Clinoptilolite is a natural zeolite used for the abatement of ammonium in the treatment of urban wastewater. By considering that mullite was obtained through thermal treatment of NH 4 -exchanged synthetic zeolites, this work aimed to evaluate if this phase can be obtained from NH 4 -clinoptilolite. A material containing about 90 wt % of clinoptilolite, prepared using a Sardinian zeolite-rich rock, was NH 4 -exchanged and subjected to treatments up to 1200 • C. After dehydration, de-ammoniation, and dehydroxylation processes, the clinoptilolite structure collapsed at 600 • C. An association of mullite, silica polymorphs, and glass, whitish in color, was obtained for treatments between 1000 and 1200 • C. The higher degree of crystallinity was reached after a 32 h heating at 1100 • C: mullite 22 wt %, cristobalite 59 wt %, tridymite 10 wt %, glass 9 wt %. It is possible to speed up the kinetics of the transformation by increasing the temperature to 1200 • C, obtaining the same amount of mullite in 2 h, but increasing the residual amorphous fraction (16 wt %). These results indicate that NH 4 -clinoptilolite could represent a raw material of potential interest in the ceramic field, in particular in the production of acid refractory, opening scenarios for a possible reuse of clinoptilolite-based exchangers employed in ammonium decontamination.

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Effect of natural zeolite addition on sintering kinetics of porcelain bodies

Cited by 33 publications

References 9 publications

The sintering kinetics of porcelain bodies made from waste glass and fly ash

The sintering kinetics of porcelain bodies made from waste glass and fly ash

Sintering of Whiteware Body Depending on Different Fluxing Agents and Binders

Thermal Transformation of NH4-Clinoptilolite to Mullite and Silica Polymorphs

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