Illite Clay Ceramic Hollow Sphere - Obtaining and Properties

Abstract

This work focuses on clay ceramic hollow spheres (CCHS) preparation using Liepa clay and sacrificial template method in a lab scale device and testing of their properties. Water retention and compression strength were investigated in order to found out if obtained CCHS can be used as an additive for improving soil resilience.The synthesis and characterization of CCHS using expanded polystyrene spheres (EPS) as sacrificial template is presented. CCHS were fired at five different temperatures and their compressive strength, water retention, bulk density, material density, water absorption, phase composition, surface morphology, porosity using hydrostaticweighing and BET nitrogen adsorption methods, were determined.Study of clay ceramic hollow sphere structure and surface morphology revealed that all samples have spherical shape. These spheres have several pronounced protrusions from the granulation process. Clay ceramic hollow spheres have porosity rate of 21 - 36% and a water absorption rate of 15 -33%. The highest rate of porosity and water absorption was observed for hollow spheres fired at 1050°C.The increase of clayceramic hollow spheresfiringtemperature led to decrease of specific surface area-thehighestvaluewas observed at950°C and the lowest at 1150°C. The bulk density increased at 1150°C.Mechanicalstrength test of ceramic hollowspheres(HS)revealedthat with the increase of scorchingtemperature the compression strength of the spheres increasedas well.The sphere hollowshadpractically globular shape with the averagewallthickness of0,6 mm, whichcomprises10-13% ofthe outer diameter.The obtained clay ceramic hollow spheres are proposed as water retention agent.

Effect of Fly-Ash Cenospheres on Properties of Clay-Ceramic Syntactic Foams

“…Liepa clay also contained several distinctive components such as iron oxide (Fe 2 O 3 —6.88 ± 0.2 wt %), while other elements like Na, K, Ca, Mg, Ti (in the form of oxides) did not exceed 8 wt % in total [ 18 ]. As reported in [ 24 , 25 ], the phase composition of Liepa clay changes under thermal treatment. The initial illite phase becomes less pronounced at 950 °C and disappears at higher firing temperatures (up to 1200 °C).…”

“…To facilitate sample compaction and compacted specimen extraction from the mould, the lubricant Zusoplast G 72 (Zschimmer & Schwarz Gmbh & Co KG, Lahnstein, Germany) was used at a level of 2.0 wt %. Furthermore, the surfactant (−)-Ethyl L-lactate, (cleaning grade, ≥98.0%, Sigma-Aldrich Chemie Gmbh, Munich, Germany) was used to improve clay and CS particle wetting [ 18 , 24 , 26 ] at a level of 2 wt %. Another 0.5 wt % of a dispersing agent on huminite-silicate basis, Dolaflux B 11 (Zschimmer & Schwarz Gmbh & Co KG, Lahnstein, Germany), was introduced.…”

Using circular economy principles to recycle materials in guiding the design of a wet scrubber-reactor for indoor air disinfection from coronavirus and other pathogens

“…% facilitate mechanical strength at lower (800-950 °C) firing temperatures ( Shishkin et al, 2020b ). Another, clay-based porous material – clay ceramic hollow spheres were also investigated ( Shishkin et al, 2016 ). They were obtained from red clay containing high Fe 2 O 3 , fired at 950 °C and achieved a specific surface area of 1.9 m 2 g −1 .…”

Mechanical properties of illite‐based ceramics with controlled porosity studied by modern in situ techniques

“…In addition to mechanical performance, plenty of other present‐day applications (ie, thermal insulation, filtration, fuel cell separators, burners, gas sensors, biological media, etc) often require particular control of porosity. Obviously, a good balance between porosity and a variety of desired physical properties must be attained …”