Wall Ceramics Products Based on Opoka and Coal Slurry

Kotlyar, Vladimir; Lapunova, Kira; Kozlov, Gleb Aleksandrovich

doi:10.1016/j.proeng.2016.07.080

Cited by 7 publications

(3 citation statements)

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“…Owing to their thermal and mechanical properties, Opoka finds application in the building industry, cement production, road construction, and the manufacture of decorative lining and ceramic materials [ 42 , 46 ]. The sorption properties of Opoka materials are utilized in the processes of water and sewage purification to remove phosphorus, magnesium, and iron, among others [ 43 , 47 ].…”

Section: Introductionmentioning

confidence: 99%

The Accelerated Aging Impact on Mechanical and Thermal Properties of Polypropylene Composites with Sedimentary Rock Opoka-Hybrid Natural Filler

et al. 2022

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This paper presents the impact of accelerated aging on selected mechanical and thermal properties of isotactic polypropylene (iPP) composites filled with sedimentary hybrid natural filler-Opoka rock. The filler was used in two forms: an industrial raw material originating as a subsieve fraction natural material, and a rock calcinated at 1000 °C for production of phosphorous sorbents. Fillers were incorporated with constant amount of 5 wt % of the resulting composite, and the material was subjected to accelerated weathering tests with different exposition times. The neat polypropylene and composites with calcium carbonate as a reference filler material were used for comparison. The aim of the research was to determine the possibility of using the Opoka rock as a new hybrid filler for polypropylene, which could be an alternative to the widely used calcium carbonate and silica. The thermal, mechanical, and structural properties were evaluated by means of differential scanning calorimetry (DSC), tensile tests, scanning electron microscopy (SEM), and Fourier-transform infrared spectroscopy with attenuated total reflectance (FTIR/ATR) prior to and after accelerated aging. As a result, it was found that the composites of polypropylene with Opoka were characterized by similar or higher functional properties and higher resistance to photodegradation compared to composites with conventional calcium carbonate. The results of measurements of mechanical properties, structural and surface changes, and the carbonyl index as a function of accelerated aging proved that Opoka was an effective ultraviolet (UV) stabilizer, significantly exceeding the reference calcium carbonate in this respect. The new hybrid filler of natural origin in the form of Opoka can therefore be used not only as a typical powder filler, but above all as a UV blocker/stabilizer, thus extending the life of polypropylene composites, especially for outdoor applications.

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Section: Introductionmentioning

confidence: 99%

The Accelerated Aging Impact on Mechanical and Thermal Properties of Polypropylene Composites with Sedimentary Rock Opoka-Hybrid Natural Filler

et al. 2022

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“…The research data has practical significance for the wall ceramics industry. Due to the wide prevalence of opoka-like rocks in many regions of the country, their use for the production of ceramic bricks with the resource-saving technologies will be cost effective and technologically sound both in new plants and in existing ones [19][20]. The proposed technology of soft molding is the most optimal method for the production of old-looking face bricks based on opoka-like rocks.…”

Section: Discussionmentioning

confidence: 99%

Face Ceramic Brick of Soft Molding Based on Opoka-Like Raw Materials

Bozhko

Lapunova

Postoi

2020

SSP

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This article reflects the results of a set of studies on obtaining a face ceramic brick of soft molding with the search for raw materials and the development of an optimal production technology. It proposed and formulated the basic requirements for opoka-like rocks for the production of various types of wall ceramic products. They include recommendations on the chemical composition and such physical, mechanical and technological properties as density in the piece, natural humidity, porosity, mineral composition, compressive strength of the baked samples, fire shrinkage, water absorption, average density, etc. We proposed the so-called "soft molding" as a production technology. It is based on the principle of filling individual forms with a ceramic mass that has a certain plasticity and binding capacity. The appearance of such a brick is characterized by the absence of smooth edges and sides and rounded corners. The sand used for spilling forms produces a special effect of velvety and old-looking brick. The conclusions based on the results of laboratory and technological research as well as factory tests revealed the great promise for using opoka-like rocks as a raw material for the production of face ceramic bricks of soft molding.

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“…However, the quantitative and qualitative compositions of opoka may vary, depending on its origin [13,14]. Owing to their thermal and mechanical properties, opokas find application in the building industry, cement production, road construction, river revetment, and the manufacture of decorative lining and ceramic materials [10][11][12]15]. The sorption properties of opokas are utilized in the processes of water and sewage purification to remove phosphorus, magnesium and iron, among others [10,16].…”

Section: Zastosowanie Pomiarów Reologicznych Typu In-line W Charaktermentioning

confidence: 99%

Application of in-line rheological measurements for characterization of polypropylene/opoka rock powder composites

et al. 2019

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The rheological properties of the composites of polypropylene (PP) with a new natural powder hybrid filler-carbonate-silicate rock called opoka-were investigated. Opoka rock is industrial waste originating (as a subsieve fraction) from the production of sorbents used in water treatment processes. The effect of opoka addition (1, 5 and 10 wt %) on the processability of PP was determined during the extrusion process using an in-line measuring stand. The testing instrument was an extruder rheometer equipped with a rheological measuring head with exchangeable dies. Cylindrical measuring dies with a radius of 1.5 mm and a length of L = 20, 30, 40 and 50 mm, respectively, were used in the measurements. The rheological parameters of the composites were determined based on the Ostwald-de-Waele power-law model at a temperature of 230 °C. The effect of the addition of opoka on the extruder operating characteristic, flow curves, viscosity curves, and the values of power law index (n), consistency factor (K), mass flow rate (MFR) and volume flow rate (MVR) have been determined.

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Wall Ceramics Products Based on Opoka and Coal Slurry

Cited by 7 publications

References 0 publications

The Accelerated Aging Impact on Mechanical and Thermal Properties of Polypropylene Composites with Sedimentary Rock Opoka-Hybrid Natural Filler

The Accelerated Aging Impact on Mechanical and Thermal Properties of Polypropylene Composites with Sedimentary Rock Opoka-Hybrid Natural Filler

Face Ceramic Brick of Soft Molding Based on Opoka-Like Raw Materials

Application of in-line rheological measurements for characterization of polypropylene/opoka rock powder composites

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