Upgrading of Raw Perlite by a Dry Magnetic Technique

Herskovitch, D.; Lin, I. J.

doi:10.1155/1996/58505

Cited by 15 publications

(4 citation statements)

References 3 publications

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“…The analysis of the chemical composition of the examined mineral raw material is shown in (Tables 1 and 2). A similar chemical composition is determined in researches of many authors: Herskovitch et al (1995); Uemura et al (1999); Jing, Fang, Liu, & Liu (2011). In the Table 1 we presented chemical composition of perlite.…”

Section: Methodssupporting

confidence: 61%

The Adsorption Character of Perlite, Influence on Nitrogen Dynamics in Soil

Markoska¹,

Spalević²

2020

AgricultForest

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In this research the sorption of the cations NH 4 + , Al 3+ , Fe 2+ , Mn 2+ , and Mg 2+ in powdered perlite and its mixture with soil was monitored. Of all observed cations in perlite by the first minutes of laboratory experiments, which is very fast, the ammonia sorption cations reacted fastest. Тhe dynamics of nitrate and ammonia nitrogen in the soil after application of perlite in different quantities were observed. Reduced ammonia content was apparent in variants with perlite one (1) month of application. Three (3) months later, distributed ammonium content increased in variants with perlite from 24% to 59%, compared with the control variant due to the gradual release of ammonium perlite lattice. Six (6) months after the application, statistically significant differences were found not only between the control variant and variants with perlite, but also between the individual variants with different perlite doses (n = 13.2; P = 0.003 according to Kruskal-Wallis test). The process of nitrification in the soil was strong because of the applied perlite. The content of nitrate nitrogen in the soil is reduced by 66% to 78% compared to control variation in the fall time; therefore, the amount of nitrate leaching from soil horizons groundwater is minimal. In summary, perlite can be considered to be a slow release nitrogen fertilizer. This research concluded that the perlite can find application in the production of mineral fertilizers that is gradually giving the necessary cations.

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Section: Methodssupporting

confidence: 61%

The Adsorption Character of Perlite, Influence on Nitrogen Dynamics in Soil

Markoska¹,

Spalević²

2020

AgricultForest

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“…It was created as a result of undersea volcanic activity on the edge of a subduction zone, with very acidic viscous lava and pyroclastic materials. This ore contains 90–95% of amorphous volcanic glaze, 5.0 to 6.0% of crystalline components, mainly quartz, plagioclase, biotite, and 2.5–3.5% of water [ 14 , 32 ]. Despite comparable prices of these raw materials, perlite from the Hungarian deposits differs from the Slovak perlite ore in terms of properties of the obtained expanded perlite.…”

Section: Methodsmentioning

confidence: 99%

Dehydroxylation of Perlite and Vermiculite: Impact on Improving the Knock-Out Properties of Moulding and Core Sand with an Inorganic Binder

et al. 2021

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The article presents the results of research aimed at examining the type of swelling material introduced into moulding or core sand to improve their knock-out properties. Tests on Slovak perlite ore (three grain sizes), Hungarian perlite ore and ground vermiculite (South Africa) were carried out. For this purpose, thermal and structural analyses (FTIR—Fourier Transform Infrared Spectroscopy), a chemical composition test (XRF-X-Ray Fluorescence), phase analysis (XRD—X-Ray Diffraction), and scanning electron microscopy (SEM—Scanning Electron Microscope) as well as final strength tests of moulding sands with the addition of perlite ore and vermiculite were carried out. The results of thermal studies were related to IR (Infrared Spectroscopy) spectra and XRD diffractograms. It has been shown that the water content in the pearlite ore is almost three times lower than in vermiculite, but the process of its removal is different. Moreover, the chemical composition of the perlite ore, in particular the alkali content and its grain size, may influence its structure. The phenomena of expansion (perlite) and peeling (vermiculite) have a positive effect on the reduction of the final sand strength and eliminate technological inconveniences (poor knocking out) that significantly limit the wide use of moulding sands with inorganic binders.

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“…Expanded perlite is an acidic volcanic rock, the perlite not expanded has a density close to 1100 kg/m³ and a thermal conductivity of 0.047 W/mK [8]. While the expanded perlite has a density between 30 and 150 kg/m³, and its chemical composition (percentage by weight) is showed in Table 1.…”

Section: Manufacture Of Expanded Perlite Fibresmentioning

confidence: 99%

“…The thermal conductivity of perlite 0.047 W/mK [8], the thermal conductivity of resin 0.19 W/mK [9], and B is the volume fraction of the resin which is assumed to present a continuous path for heat flow [6]. With these values solved in MatLab, the thermal conductivity behavior of composite versus the fraction volume of resin is depicting in Figure 2.…”

Section: Epoxy Matrixmentioning

confidence: 99%