The influence of binders for the pelletization of fly ash zeolites on sulfur dioxide sorption properties

Abstract

Fly ash zeolites are economically and ecologically attractive alternatives to synthetic and natural zeolites. Their use as sulfur dioxide sorbents is one of the possible applications of these materials. During the process of fly ash zeolite synthesis, a light powder is formed, which is not acceptable in practical applications due to technical problems, such as a marked drop in pressure, diffusion limits, hydraulic resistance, clogging in the packed beds and the possibility of losing a bed. It is therefore necessary to perform a pelletization process. Thickening of the material during pelletization influences sorption capacity negatively due to diffusing limitations, while the lack of an additional binder may result in a material of low mechanical durability. In this study, pressure pelletization experiments with fly ash zeolite were performed. Binders were selected on the basis of economic considerations as well as their potential to exert a positive influence on the sorption properties of the produced pellets. Cyclic sorption experiments were conducted (on sulfur dioxide) in which one zeolite powder sample was subjected to pelletization without a binder and another sample was subjected to the process with selected binders added. The results of the experiments were then analysed to ascertain the influence of the pelletization process on sulfur dioxide sorption capacity.

Mineral Composition and Structural Characterization of the Clinoptilolite Powders Obtained from Zeolite-Rich Tuffs

“…This also concerns the clinoptilolite powder, which is especially problematic when it comes to consolidation. Difficulty in the zeolite powder compaction is mainly related to its unique physicochemical properties, such as high alkaline pH, moisture swelling, and decreasing of sorption properties due to compaction processes with the binder application [71]. One of the factors influencing the material susceptibility to the compaction processes is its grain size [72][73][74].…”

Geopolymer Building Materials Based on Fly Ash in Terms of Removing SO2, CO2, and Water Vapor

“…Adsorption is the process of mass transfer. The process is used in many industrial technologies, and it is carried out using adsorbents [20,21]. Adsorption on geopolymers can be used for purification, decolorization, separation or detoxification [22].…”

The improvement of soil, plant growth, and sugarcane yield Saccharum officinarum (L) on account of the application of fly ash granule and dolomite as ameliorating agents in peat soil

“…Fly ash application directly in the soil is not proposed due to the human health consideration related to the existence of possible nanoparticles [3], which might impact the human respiration system. In the procedure of the granulation process, various granule binding agents are considered, such as tapioca flour [5], synthetic polymer [4], and molasses [5]. Additional clay composition to the fly ash did not change the soil's physical characteristics after the application [6].…”