Highly porous ceramics production using slags from smelting of spent automotive catalysts

To speed up the wastewater treatment under aerobic conditions and to optimize the processes of anaerobic wastewater treatment in digesters, immobilization technologies of microorganisms and enzymes on solid carriers are used. Ceramic carriers based on aluminosilicates and alumina are one of the promising inorganic biomass carriers. (Research purpose) To study the structure of porous ceramic biomass carriers for anaerobic processing of organic waste and evaluate the prospects for their use. (Materials and methods) The substrate for anaerobic digestion was a mixture of sediments of the primary and secondary sewage sumps of the Lyubertsy treatment facilities. K-65 cattle feed was used to ensure the constancy of the composition of organic substances in substrates as a cosubstrate. The authors used the method of low-temperature nitrogen adsorption of Bruner-Emmett-Teller to study the pore structure and specific surface of solid carriers on a specific surface analyzer Quntachrome Autosorb-1. (Results and discussion) The main characteristics (specific surface, volume of micro- and mesopores, predominant pore radius, water absorption and others) of chamotte foam lightweight and highly porous corundum ceramics were determined. It was revealed that ceramic materials with a developed surface and electrically conductive material provided an increase in biogas yield by 3.8-3.9 percent with an increase in methane content by an average of 5 percent. (Conclusions) The results of anaerobic digestion showed a positive effect of both a conductive carrier and highly porous ceramic materials on the process of anaerobic bioconversion of organic waste into biogas. It is advisable to expand experimental studies on the use of a conductive carrier with a developed surface based on highly porous ceramics.

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Mechanical and dielectric properties of 3D printed highly porous ceramics fabricated via stable and durable gel ink

Journal of the European Ceramic Society ◽

10.1016/j.jeurceramsoc.2019.07.002 ◽

2019 ◽

Vol 39 (15) ◽

pp. 4680-4687 ◽

Cited By ~ 8

Author(s):

Haize Jin ◽

Zhihua Yang ◽

Jing Zhong ◽

Delong Cai ◽

Hailiang Li ◽

...

Keyword(s):

Dielectric Properties ◽

Porous Ceramics ◽

3D Printed ◽

Highly Porous

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95/01883 Manufacture and evaluation of highly porous ceramics with adjustable electrical resistance

Fuel and Energy Abstracts ◽

10.1016/0140-6701(95)93548-7 ◽

1995 ◽

Vol 36 (2) ◽

pp. 129

Keyword(s):

Electrical Resistance ◽

Porous Ceramics ◽

Highly Porous

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Wood-Derived Porous Ceramics via Infiltration of SiO2-Sol and Carbothermal Reduction

Holzforschung ◽

10.1515/hf.2003.065 ◽

2003 ◽

Vol 57 (4) ◽

pp. 440-446 ◽

Cited By ~ 18

Author(s):

R. Klingner ◽

J. Sell ◽

T. Zimmermann ◽

A. Herzog ◽

U. Vogt ◽

...

Keyword(s):

Cell Wall ◽

Carbothermal Reduction ◽

Porous Ceramics ◽

Nitrogen Atmosphere ◽

Silica Sol ◽

Simple Process ◽

Sic Ceramic ◽

Efficient Route ◽

The Individual ◽

Highly Porous

Summary The use of wood as a structure-giving material may be the key to producing temperature-resistant ceramics featuring high and directed porosity combined with necessary strength. The objective of this study was to develop a simple process to convert the evolutionarily optimized material wood into highly porous ceramics. Beech and pine, known to be relatively permeable, were pyrolyzed in a nitrogen atmosphere. The carbon-templates formed were infiltrated with various kinds of silica sol (SiO2). The resulting SiO2/C composite was transformed into a SiC-ceramic (silicon carbide) via carbothermal reduction. Through the described process the macroscopic pore-structure of wood was transformed exactly into SiC. The SiC-ceramic produced proved to be thermo-resistant. It remained stable in oxygen atmosphere at 1200°C, after a SiO2 coating around the SiC had been formed. This study focused on the alteration of the cell wall microstructure during the conversion of wood into SiC. Furthermore, the optimization of the individual process steps, pyrolysis, infiltration and ceramization along the most efficient route was pursued.

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Reply to "Comment on 'Simple Mathematical Model for the Electrical Conductivity of Highly Porous Ceramics'"

Journal of the American Ceramic Society ◽

10.1111/j.1151-2916.1996.tb08744.x ◽

1996 ◽

Vol 79 (11) ◽

pp. 2999-2999

Author(s):

Junichiro Mizusaki ◽

Soji Tsuchiya ◽

Katsunori Waragai ◽

Hiroaki Tagawa ◽

Yoshihide Arai ◽

...

Keyword(s):

Mathematical Model ◽

Electrical Conductivity ◽

Porous Ceramics ◽

Simple Mathematical Model ◽

Highly Porous

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Electrical properties and microstructure fractal analysis of magnesium-modified aluminium-silicate ceramics

Science of Sintering ◽

10.2298/sos1102193p ◽

2011 ◽

Vol 43 (2) ◽

pp. 193-204 ◽

Cited By ~ 2

Author(s):

J. Purenovic ◽

V.V. Mitic ◽

Lj. Kocic ◽

V.B. Pavlovic ◽

V. Paunovic ◽

...

Keyword(s):

Fractal Analysis ◽

Sintering Temperature ◽

Electrical Characterization ◽

Porous Ceramics ◽

Before And After ◽

High Degree ◽

Highly Porous ◽

Aluminium Silicate

The addition of Mg2(NO)3 and some active additives, composed of Al salts, to the mixtures of kaolinite and bentonite can provide clay compositions which, after sintering at high temperatures, produce very porous ceramics with microcrystalline and amorphous regions and highly developed metalized surfaces (mainly with magnesium surplus). Characterization of sintered samples was done before and after treatment in ?synthetic water?, i.e. in aqueous solution of arsenic-salt. Microstructure investigations have revealed non-uniform and highly porous structure with broad distribution of grain size, specifically shaped grains and high degree of agglomeration. Electrical characterization was estimated by determining dielectric constant and electrical resistivity in function of active additives amount and sintering temperature. Fractal analysis has included determination of grain contour fractal dimension.

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Research and Development of Multifunctional Porous Materials on the Basis of Clay and Glass Waste

10.7250/9789934226342 ◽

2021 ◽

Author(s):

◽

Andrejs Šiškins

Keyword(s):

Literature Review ◽

Research And Development ◽

Glass Ceramics ◽

Porous Ceramics ◽

Household Waste ◽

Glass Cullet ◽

Practical Application ◽

Glass Waste ◽

Experimental Part ◽

Highly Porous

The Ph. D. Thesis is devoted to the obtaining of porous ceramics from Latvian clay and household waste ‒ glass cullet. Using modern technological approaches porous and highly porous clay-glass ceramics were obtained, their properties and practical application possibilities were studied. The Doctoral Thesis consists of an introduction, literature review, methodical part, evaluation of the results of the experimental part, conclusions, and bibliography.

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