Hydrothermal Synthesis of a Novel Tobermorite-Based Porous Material from Municipal Incineration Bottom Ash

Abstract

A novel tobermorite-based porous material has been synthesized from municipal incineration bottom ash (MIBA), using a hydrothermal processing method under saturated steam pressure (1.0 MPa) at 453 K for 12 h. Without additional vesicants, NaOH solution that is incorporated into the starting material acts as both a reaction solvent and a vesicant. As a reaction solvent, the NaOH solution first promoted tobermorite formation to form a huge number of small pores during hydrothermal processing; then, as a vesicant, it was released as vapor from the solidified specimens to form large pores after drying. The porous material possessed a pore diameter distribution of 0.01−10 μm, a BET specific surface area of 60 000 m2/kg, and a bulk density of 500−700 kg/m3. Moreover, the leaching tests showed that the concentration of heavy metals dissolved from the solidified specimen became very low after hydrothermal processing.

Highly efficient water splitting and carbon dioxide reduction into formic acid with iron and copper powder

“…Reactor I and II were made of stainless steel with an inner volume of 5.7 mL and 42 mL respectively, and Reactor III was a Teflon-lined stainless steel reactor with an inner volume of 28 mL. The schematic drawing of these reactors can be found elsewhere [18][19][20]. The Reactor I was made of a piece of SUS-316 stainless steel tubing (9.525 mm (3/8 in.)…”

“…Reactor III with a Teflon-lined inner was also used to further study the iron conversion mechanism. The details of this reactor has been described elsewhere [20]. If there is no specific explanation, all the experiments were carried out in the Reactor I.…”

Hydrothermal solidification of municipal solid waste incineration fly ash

“…Our previous work showed that tobermorite formation could improve the strength of hydrothermally solidified specimens [14,15]. Tobermorite, a calcium silicate hydrate mineral of ideal composition Ca 5 Si 6 H 2 O 18 Á4H 2 O, is very rare naturally but can be synthesized by hydrothermal processes [15].…”

“…Tobermorite, a calcium silicate hydrate mineral of ideal composition Ca 5 Si 6 H 2 O 18 Á4H 2 O, is very rare naturally but can be synthesized by hydrothermal processes [15]. According to Table 1, addition of quartz may promote tobermorite formation because of the low Si content of the raw fly ash.…”

Synthesis and microstructure analysis of autoclaved aerated concrete with carbide slag addition

“…And all kinds of them have been researched home and abroad to produce AAC, e g, burnt waste residue [7] ; Efflorescence Sand-Phosphorus SlagLime [8] ; zeolite [9,10] ; cement bypass dust and waste container glass [11] ; riverbed sediments [12] ; municipal solid waste incineration bottom ash [13][14][15] ; blast furnace slag [16,17] ; coal fly ash [5,18] ; silty siliceous crushed stone [19] . However, the literature appears to contain few researches dealing with production of AAC with carbide slag.…”