Synthesis of Zeolite X from Waste Sandstone Cake Using Alkali Fusion Method

Wajima, Takaaki; Yoshizuka, Kazuharu; Hirai, Takashi; Ikegami, Yasuyuki

doi:10.2320/matertrans.mra2007250

Cited by 30 publications

(16 citation statements)

References 18 publications

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“…7,8) Utilizing solid wastes for production of such kinds of material is therefore an interesting area of research and development. [9][10][11][12][13] Melting slag usually contains significant amount of alumina, silica etc., thus would be an appropriate starting material for synthesis of zeolites, and number of reports already have cited this. [14][15][16] However, little information is available concerning synthesis of iron-incorporated Na-A type zeolites from melting slag and their potential application as toxic gas adsorbents.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Toxic Gases on Iron-Incorporated Na-A Zeolites Synthesized from Melting Slag

et al. 2009

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Iron incorporated zeolites were prepared from Na-A type zeolite synthesized from melting slag and FeCl 3 solution and applied as adsorbents for NH 3 and H 2 S gases. Iron incorporated zeolite was pelletized, calcined and used for gas adsorption experiment. XRD analyses of the zeolite revealed that Fe 3þ concentration of solution more than 90 mM could destruct the zeolite network structure. It was observed that the gas adsorption capacities of these zeolite pellets depend significantly on iron concentration of solution and calcination temperature. The type of binders affected a little on gas adsorption capacities. From adsorption results, adsorption capacity for NH 3 was proportional to Fe 3þ concentration and it was increased with calcination temperature up to 500 C, but it was decreased over 600 C. Pellets prepared from 56 mM Fe 3þ solution calcined at 500 C showed highest ammonia adsorption capacity (3.7%). This iron incorporated Na-A type zeolites showed much higher adsorption capacities for NH 3 (2:4$3:7%) than commercially available activated carbons (0:16$0:44%) and zeolites (0:23$0:60%). In the case of adsorption capacities for H 2 S, adsorption capacity was proportional to Fe 3þ concentration and inversely proportional to calcination temperature. Pellets prepared from 78 mM Fe 3þ solution calcined at 200 C showed highest hydrogen sulfide adsorption capacity (1.5%). Adsorption capacity (0:2$1:5%) was found to be lower than that of the commercial activated carbons (1:2$2:4%) and higher than that of commercial zeolites 4A (0.15%) and 13X (0.91%). Higher ammonia adsorption in iron incorporated Na-A zeolites could be possibly due to development of number of acid sites on the zeolites surface due to incorporation of Fe 3þ ion.

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Section: Introductionmentioning

confidence: 99%

Adsorption of Toxic Gases on Iron-Incorporated Na-A Zeolites Synthesized from Melting Slag

et al. 2009

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“…Experimental procedure and conditions were based on the results of Shigemoto et al [12,13] and Wajima et al [14][15][16] 10 g of the ash was mixed with 12 g of NaOH powder and ground to obtain a homogeneous mixture. This mixture was then heated in a nickel crucible in air at 600℃ for 6 h. The resultant material was cooled to room temperature and ground again to obtain powdered fused material.…”

Section: Alkali Fusionmentioning

confidence: 99%

Material Conversion from Various Incinerated Ashes Using Alkali Fusion Method

Wajima

Sugawara

2010

Int.J.Soc.Mater.Eng.Resour.

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Conversion of three different types of incineration ash, coal fly ash (CFA), paper sludge fly ash (PSFA) and industrial waste incineration fly ash (IWIFA) into useful materials using the alkali fusion method is attempted. The chemical and mineralogical compositions of these ashes differed. [KCl]. Zeolites (zeolite-X, -A, -P and hydroxysodalite), hydrogrossular (katoite), and calcite were synthesized from the ashes. With an increasing Ca content of the ash, the Si concentration in the solution decreased, and the main product phases changed from zeolite (aluminosilicate) to hydrogrossular (calcium aluminosilicate), and finally to calcite (calcium carbonate). The observed concentrations of Si, Al, and Na in the solution during the reaction explain the crystallization of these phases.

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“…In a previous study, we converted waste sandstone cake, which was discharged from one of the quarry in Japan, into a zeolitic material by the alkali fusion method and succeeded in synthesizing crystalline zeolite-13X with a high cation exchange capacity (CEC) [1] [2] [3]. By alkali fusion, most of the crystalline phases could be converted into soluble phases and transformed into zeolite crystals.…”

Section: Introductionmentioning

confidence: 99%

Alkali Fusion Synthesis of Zeolitic Materials from Waste Dehydrated Cake Discharged from Recycling of Construction Waste Soil

Wajima¹

2017

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An inorganic cation exchanger, zeolitic material, was synthesized from dehydrated cake, which was discharged from recycling of construction waste soil, using the alkali fusion method. The waste clay was mixed with NaOH powder (the weight ratio of NaOH/waste clay = 1.0) and then heated at 300˚C for 1 h to make a fused material. This fused material was then added to distilled water, and then heated at 90˚C, 120˚C, 150˚C and 180˚C for 12 h in reaction bombs under autogenous pressure in order to synthesize the cation exchanger. As a result, waste cake can be converted into fused material with high solubility, and zeolitic materials can be synthesized from the fused material. A mixture of zeolite-X and hydroxysodalite was synthesized at 90˚C and 120˚C, hydroxysodalite alone was synthesized at 150˚C and 180˚C. By increasing the synthesis temperature, the cation exchange capacity (CEC) of the product decreased, and the highest CEC of the product at 90˚C, including zeolite-X, was 2.06 mmol/g, which is 64.3% of commercial zeolite-13X (3.2 mmol/g).

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Synthesis of Zeolite X from Waste Sandstone Cake Using Alkali Fusion Method

Cited by 30 publications

References 18 publications

Adsorption of Toxic Gases on Iron-Incorporated Na-A Zeolites Synthesized from Melting Slag

Adsorption of Toxic Gases on Iron-Incorporated Na-A Zeolites Synthesized from Melting Slag

Material Conversion from Various Incinerated Ashes Using Alkali Fusion Method

Alkali Fusion Synthesis of Zeolitic Materials from Waste Dehydrated Cake Discharged from Recycling of Construction Waste Soil

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