Effect of moisture content on extrusion process of kaolinitic–illitic clay in manufacturing of ceramic Raschig ring

Salehi, Mehdi; Salem, Amin

doi:10.1016/j.jmatprotec.2007.09.013

Cited by 12 publications

(9 citation statements)

References 5 publications

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“…Also, slip casting can be considered as an alternative method for production of Raschig rings 4 . The advantages of extrusion process include high mechanical strength and adequate strength reliability 4,5 . The firing of ceramic Raschig ring promotes physicochemical reactions responsible for the final properties of the ceramic products.…”

Section: Introductionmentioning

confidence: 99%

Influence of Nepheline Syenite on Mechanical Reliability of Ceramic Raschig Rings

Rostami

Salem

Paknjhad

2011

Int J Applied Ceramic Tech

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The influence of nepheline syenite on physicomechanical properties of extruded ceramic Raschig ring was investigated. Industrial kaolin was used as reference composition and different amounts of kaolin were replaced with nepheline syenite ranging 5-15 wt%. The laboratory experimental results showed that the use of 5 wt% nepheline syenite in ceramic composition improves the final product characteristics. This mix also showed maximum mechanical compressive strength and reliability attributed to improve microstructural homogeneity. On comparing the chemical resistance data, it was found that the optimum condition for obtaining the maximum strength and reliability satisfactorily covers the optimum condition for chemical resistance.

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Section: Introductionmentioning

confidence: 99%

Influence of Nepheline Syenite on Mechanical Reliability of Ceramic Raschig Rings

Rostami

Salem

Paknjhad

2011

Int J Applied Ceramic Tech

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“…The microstructure analysis of the fracture surfaces indicated that the defects produced by the extrusion were typically uniform compared to those produced by other shaping methods. The results of investigation carried out by Salehi and Salem clearly indicated that the moisture of paste significantly influences both the diametrical compression strength and reliability of rings (5). The optimum moisture content to achieve maximum Weibull modulus was determined to be between 20 and 25 wt.%.…”

Section: Methodsmentioning

confidence: 97%

“…and [5] According to ASTM C-1239 standard method the confidence bounds can be constructed for estimated Weibull modulus and characteristic strength (17). The 90% confidence bound on characteristic strength is obtained from the 5 and 95 percentile distributions.…”

Section: [4]mentioning

confidence: 99%

Effect of nepheline syenite particle size on diametrical compression strength and reliability of extruded ceramic Raschig rings used in packed towers

Salem¹,

Rostami²

2013

Bol. Soc. Esp. Ceram. Vidr.

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In order to understand the effect of nepheline syenite particle size on physico-chemical properties of ceramic Raschig rings, the fluxing agent was grinded at different milling times. The compositions were prepared by blending the illitic-kaolinitic clay and pre-grinded particles. The rings were shaped by a laboratory extruder and then were sintered at 1200 ºC. The mechanical reliability of sintered specimens was mathematically described by Weibull theory and the effect of pre-grinding of fluxing agent on Weibull modulus was evaluated by measuring the diametrical compression strength. Weibull modulus and strength were the criteria for selecting the suitable particle size range of nepheline syenite. It was found that the pre-grinding of nepheline syenite acts as fairly strong parameter on microstructure of rings. The investigation concludes that reliable rings can be fabricated if the particle size of nepheline syenite is arranged between 53 and 75 μm. This enhancement in reliability is valuable in packed towers.

Para conocer el efecto del tamaño de partícula de nefelina sienita sobre las propiedades fisicoquímicas de los anillos Raschig cerámicos, este fundente fue molido a diferentes tiempos. Las composiciones se prepararon mediante la mezcla de la arcilla caolinítica illitica y las partículas pre-molidas. Los anillos se obtuvieron en una extrusora de laboratorio y luego fueron sinterizados a 1200 ºC. La fiabilidad mecánica de las muestras sinterizadas se describe matemáticamente por la teoría de Weibull y el efecto de pre-molienda del fundente en el módulo de Weibull se evaluó midiendo la resistencia a la compresión diametral. El módulo de Weibull y la resistencia fueron los criterios para seleccionar el rango de tamaño de partícula adecuado de nefelina sienita para la fabricación de los anillos que se determinó estaba entre 53 y 75 μm comprobándose que influye considerablemente en la microestructura de los mismos. La fiabilidad alcanzada fue muy valiosa para la utilización de estos anillos como relleno en ldistintos tipos de torres

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“…Several investigations are presented on the improvement of compressive strength of ceramic bodies. [3][4][5][6] All of the studies were related to defects and pore morphology in which the strength was affected by the dimensions of defects and porosity.…”

Section: Introductionmentioning

confidence: 99%

“…5 Recently, it was reported that the compressive strength as well as the Weibull modulus of ceramic Raschig rings increases with the decrease in moisture content of paste used in the extrusion process and a maximum strength of 43.3 MPa with a Weibull modulus of 14.1 are obtainable. 6 Several studies have been published about the effect of binders on the strength of ceramic bodies. It was found that a ceramic body can be strengthened by the addition of PVA.…”

Section: Introductionmentioning

confidence: 99%

Influence of Polyvinyl Alcohol and Carboxymethyl Cellulose on the Reliability of Extruded Ceramic Body: Application of Mixture Design Method in Fabricating Reliable Ceramic Raschig Rings

Khosrowshahi¹,

Salem²

2010

International Journal of Applied Ceramic Technology

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The present investigation is a follow-up of study on the extrusion of ceramic Raschig ring as a function of composition. The pastes were formulated using typical kaolin, polyvinyl alcohol, and carboxymethyl cellulose normally used in industrial scale. The effect of binders on the mechanical behavior of rings was studied from view point of mixture design algorithm to optimize the ceramic body composition. This method was shown to yield valuable information on the effect of binders on mechanical properties. The study was concluded that the reliability of ring can be effectively promoted by the addition of 0.25% polyvinyl alcohol and 0.75% carboxymethyl cellulose.

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Effect of moisture content on extrusion process of kaolinitic–illitic clay in manufacturing of ceramic Raschig ring

Cited by 12 publications

References 5 publications

Influence of Nepheline Syenite on Mechanical Reliability of Ceramic Raschig Rings

Influence of Nepheline Syenite on Mechanical Reliability of Ceramic Raschig Rings

Effect of nepheline syenite particle size on diametrical compression strength and reliability of extruded ceramic Raschig rings used in packed towers

Influence of Polyvinyl Alcohol and Carboxymethyl Cellulose on the Reliability of Extruded Ceramic Body: Application of Mixture Design Method in Fabricating Reliable Ceramic Raschig Rings

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