Characterization of the products obtained from alkaline conversion of tuff and metakaolin

Abstract

Currently, there has been a growing interest of zeolite materials for industrial and scientific purpose. Synthetic zeolites are more often used than natural ones due to its higher purity and more uniform particle sizes. Numerous investigations are conducted in searching of inexpensive raw materials suitable for zeolite synthesis. Moreover, the temperature, pressure, times and SiO 2 /Al 2 O 3 ratio are the most important parameters which play key roles in the synthesis processes. Due to such a large number of factors that affect the process, zeolite synthesis has been undergoing constant development. Nowadays, researchers focus on the methods of synthesizing zeolites at ambient temperature and pressure. Metakaolin and tuff are natural raw materials which can be turned into a brand new class of synthetic zeolites. However, each requires different method of synthesis in order to obtain a material with best physical properties. This paper discusses the process of alkaline activation of synthetic zeolites from natural raw materials: volcanic tuff excavated in Filipowice and metakaolin obtained from Rominco company. Two methods: fusion and low-temperature synthesis, were used in the presented research. Moreover, the physical properties of raw materials and zeolites obtained were shown. Based on the XRD analysis, it was verified that materials after the synthesis process contained zeolites A, Na-X and faujasite-Na. Furthermore, the dehydration and thermal decomposition phenomena of the tuff and metakaolin before and after the synthesis process were determined by coupled TG/MS techniques.

Characterisation of post-production raw material from the Raciszyn II deposit as a material suitable for the production of alkaline-activated materials

“…Because of it containing reactive aluminosilicates, among other uses, it is an attractive material for the production of alkali-activated materials (AAM) [1][2][3][4]. By using the alkaline activation process, it is also possible to obtain, for example, sorbents or synthetic zeolites [5][6][7][8][9]. Moreover, the clays containing high amounts of calcium carbonates can also be used for the production of binders [10] or for the immobilisation of mercury in remediation processes [11].…”

An Efficacy Assessment of Phosphate Removal from Drainage Waters by Modified Reactive Material

“…After modification with 0.25 M of Ca(OH) 2 , the specific surface area of the CaTF material was 276.0 m2/g (CaTF). The modification caused an increase in the total pore volume compared to the material's prior condition (TF) [101]. For the CaTF sample, the dominant type of porosity after the modification was mesoporous.…”

“…For modification of the synthesised reactive material, the tuff of Filipowice (TF), created in a process of synthesis by the fusion method [101], a Ca(OH) 2 solution of 0.10 M concentration was used. 0.25 M; 0.50 M [95].…”

Optimal Design of pH-neutral Geopolymer Foams for Their Use in Ecological Plant Cultivation Systems

“…As an effect of fires in France between 1970–1973, which involved common organic plastics, the interest in alternative non-flammable materials has increased [5], and has directly led to the development of geopolymers. Due to excellent resistance, low shrinkage and creep abilities, high compressive strength and durability [6,7], geopolymers are being examined in many industrial, and scientific disciplines [8,9,10,11]. They are used as cements and concretes [12,13], heat-resistant materials [14,15], high-tech composites [16], anti-microbial materials for medical applications [17], adsorbents/ion-exchangers, photocatalysts, high-pressure membranes, filter media, materials, pH buffers, carrier media in bioreactors, and materials allowing solidification/stabilisation of dyes and heavy metals for applications in water and wastewater treatment [18,19,20].…”