Hydrothermal Solidification of Wastes withFormation of Zeolites

Maenami, Hiroki; Shin, Hiroto; Ishida, Hiroyuki; Mitsuda, Takeshi

doi:10.1061/(asce)0899-1561(2000)12:4(302)

Cited by 8 publications

(4 citation statements)

References 13 publications

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“…Recent publications on the hydrothermal treatment of MSWI fly ash have improved understanding considerably for new potential applications of fly ash as resources [20][21][22]. The use of MSWI fly ash for the synthesis of zeolite compounds (e.g., zeolites A and P and Sodalite) by the hydrothermal method in the NaOH solution has been demonstrated previously [20,22].…”

Section: Introductionmentioning

confidence: 98%

Hydrothermal processing of MSWI Fly Ash-towards new stable minerals and fixation of heavy metals

Bayuseno

Schmahl

Müllejans³

2009

Journal of Hazardous Materials

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Section: Introductionmentioning

confidence: 98%

Hydrothermal processing of MSWI Fly Ash-towards new stable minerals and fixation of heavy metals

Bayuseno

Schmahl

Müllejans³

2009

Journal of Hazardous Materials

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“…This means that large pores are filled with newly-formed phases. Pore structure changed during hydrothermal exposure affects the microstructure of tested material, resulting in development of the mechanical strength [12,18]. Structural changes of samples at high temperatures was studied by heat dilatometry.…”

Section: Resultsmentioning

confidence: 99%

The Hydrothermal Stability of Alkali-Activated Fly Ash/Slag Pastes by the Incorporation of Cement Kiln Dust

Kubátová¹,

Rybová²,

Zezulová³

2019

SSP

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This paper deals with hydrothermal stability of inorganic aluminosilicate polymers, which were prepared by mixing blast furnace slag, fly ash and cement kiln dust in ratio 4:2:1. Cement kiln dust was used as alkaline activator with 4M sodium hydroxide solution. Samples were cured under hydrothermal conditions up to 170 °C for 24h and changes in mechanical properties, phase composition and porosity were monitored. During the hydrothermal process, the formation of zeolite from cancrinite group was monitored. The effect of the change of composition on the thermal expansion/shrinkage was studied by thermal dilatometry. Autoclaved samples were subjected to significant irreversible shrinkage during heating to 900 °C.

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“…The SEM images depicted the formation of small, spherical grains in the sample without The results of the experimental study indicate that the formation of stable Sr-cancrinite is strongly influenced by the curing temperature and time. Based on these results, the optimal conditions for crystallization were determined to be 180 • C and 24 h. Previous research on hydrothermal treatment with different silica-alumina sources for solidifying inorganic waste materials has shown that an acicular zeolite phase transforms to the sodalite phase, eventually leading to the formation of a stable cancrinite phase as the temperature and time are increased [41]. However, in the current study, stable Sr-cancrinite was already present before hydrothermal treatment, and no transformation of the relevant phases was observed.…”

Section: The Effect Of Hydrothermal Temperature and Timementioning

confidence: 99%

Hydrothermal Synthesis of Cancrinite from Coal Gangue for the Immobilization of Sr

Wang,

Zhang,

Ang

et al. 2024

Materials

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The primary objective of this study is to investigate and develop a rapid and effective method for the immobilization of Sr in the event of a nuclear leakage incident. Coal gangue, an underutilized form of solid waste from the coal industry, can be used as a raw material for curing Sr due to its high content of silica–alumina oxides. In the present study, Sr was successfully solidified in cancrinite synthesized using a hydrothermal method with coal gangue as raw material. A stable cancrinite phase was formed at a relative alkali concentration of more than 6 M. When the Sr/Al(Si) ratio was <1/6, cancrinite was the only stable phase that varied with the hydrothermal temperature and time. When the Sr/Al(Si) ratio increased to 1/2, the cancrinite phase completely disappeared, and a new strontium feldspar phase (SrAl2Si2O8) appeared. PCT leaching experiments showed that when Sr/Al(Si) < 1/6, the Sr leaching rate of Sr-cancrinite samples obtained by hydrothermal synthesis at 180 °C for 24 h was very low.

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Hydrothermal Solidification of Wastes withFormation of Zeolites

Cited by 8 publications

References 13 publications

Hydrothermal processing of MSWI Fly Ash-towards new stable minerals and fixation of heavy metals

Hydrothermal processing of MSWI Fly Ash-towards new stable minerals and fixation of heavy metals

The Hydrothermal Stability of Alkali-Activated Fly Ash/Slag Pastes by the Incorporation of Cement Kiln Dust

Hydrothermal Synthesis of Cancrinite from Coal Gangue for the Immobilization of Sr

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