Synthesis of Zeolite from Blast Furnace Slag Using Alkali Fusion with Addition of EDTA

Abstract

A large amount of blast furnace slag, a by-product of the iron-making process, is generated annually. We attempted to convert blast furnace slag (BFS) into zeolitic materials using alkali fusion with ethylenediamine tetraacetate dihydrate (EDTA) chelation. Without addition of EDTA, a mixture of hydroxysodalite and calcite was synthesized. With EDTA addition, Ca2+ ions were trapped by chelation in solution during agitation, then the chelation was promoted by heating at synthesis, and zeolite-A, zeolite-X and hydroxysodalite were synthesized.

Ultrasound irradiation as an effective tool in synthesis of the slag-based catalysts for carboxymethylation

“…The calcium content was decreased for most of treatments. The most significant results were achieved for the materials treated with a well-known leaching agent EDTA [10] , [49] , [50] . The calcium content was decreased at least two-fold.…”

Synthesized Zeolite Based on Egyptian Boiler Ash Residue and Kaolin for the Effective Removal of Heavy Metal Ions from Industrial Wastewater

“…The solid wastes containing silica (SiO 2 ) and alumina (Al 2 O 3 ), including industrial waste forms [ 25 , 26 , 27 , 28 , 29 , 30 ] (i.e., paper sludge, coal fly ash, fly ash from heavy fuel oil (HFO) combustion, and oil shale ash) such as alumino-silicate clays [ 31 , 32 , 33 , 34 , 35 ] and biomass [ 36 , 37 , 38 ] could be converted into ecological adsorbents (zeolite). To date, several physico-chemical and solvothermal techniques, including the hydrothermal approach [ 39 , 40 , 41 ], alkali-fusion method [ 42 , 43 , 44 ], sol-gel method [ 45 , 46 , 47 ], microwave method [ 48 , 49 , 50 , 51 ], and alkali-leaching method [ 52 , 53 , 54 , 55 ], have been adopted and developed to produce synthetic adsorbents. Zeolites are crystal formations built on stiff anionic alumino-silicate structures with distinct pores or channels that link at cavities or cages [ 56 ].…”

Transformation of industrial steel slag with different structure-modifying agents for synthesis of catalysts

“…One of the ways of surface area increase by selective leaching of calcium is treatment with chelating agents, namely ethylenediamine tetraacetate dihydrate (EDTA) [15,16]. Another way for synthesis of catalysts with the desired properties is organic functionalization of the internal and external surfaces by cationic surfactants -quaternary amines [17,18].…”

“…In many cases these industrial by-products, namely desulfurization slag, cannot be used in its original form due to a poor porosity and amorphous structure. Numerous research groups applied different treating agents such as alkaline solutions [19,20], EDTA [15,16] or acids [21] for obtaining catalysts with desired properties. However, typically high concentrations of treating agents are used, requiring application of special equipment.…”

“…Successful utilization of NaOH was described in our previous work [14]. EDTA established itself as a perfect leaching agent in [15,16]. Application of surfactants, namely TEAH, is well known in the synthesis of zeolite, however, to the best of our knowledge it has never been applied for slag treatment.…”