scholarly journals Porous formation process of granules from man-triggered raw materials

2019 ◽  
Vol 97 ◽  
pp. 02025 ◽  
Author(s):  
Olga Miryuk
Keyword(s):  
Liquid Glass ◽  
Raw Materials ◽  
Glass Cullet ◽  
Equal Distribution ◽  
Molding Mixture ◽  
Porous Formation ◽  
First Time ◽  
Technological Methods ◽  
Highly Porous ◽  
Glass Mixture

The results of studies of porous structure formation in a granular glass mixture are presented. Raw mixes were prepared from glass cullet, waste of magnetite ores dressing and liquid glass. The reason for adding of magnetite ores waste to the glass mixture was the information on chemical and mineral composition, results of studies of thermal transformations of waste. The rationale for adding of 20 – 30% of magnetite ores waste into the raw mix is confirmed by lowering the bloating temperature and increasing granules porosity. The effect of pyrite mineral on structural transformations in a glass mixture has been studied for the first time. It was revealed that the presence of pyrite up to 10% in the glass mixture intensifies swelling at lower temperatures. A method for preparing a molding mixture is proposed, which ensures the formation of highly porous granules with equal distribution of cells in the structure. The method involves mechanical activation of mixture of glass cullet and magnetite ores waste by grinding in a vibratory mill and subsequent portion-wise introduction of the activated mixture into liquid glass. A complex of technological methods allows obtaining porous granules with a packed density of 300 kg/m3 at a temperature of 825°C.

scholarly journals Porous aggregate development for lightweight concrete

2020 ◽  
Vol 159 ◽  
pp. 06008
Author(s):  
Olga Miryuk
Keyword(s):  
Liquid Glass ◽  
Multicomponent Mixture ◽  
Lightweight Concrete ◽  
Raw Material ◽  
Structural Defects ◽  
Formation Mechanisms ◽  
Glass Cullet ◽  
Porous Concrete ◽  
Molding Mixture ◽  
Ore Dressing

The article presents the results of studies of a porous aggregate and lightweight concrete obtained using liquid glass and man-made materials (glass cullet, magnetite ore dressing waste, substandard rocks). Feasibility of a multicomponent feed mixture for pyroplastic swelling of granules is substantiated. Optimization of raw mix composition provided the possibility of combining various formation mechanisms of porous granules. A set of technological solutions has been developed aimed at improving the conditions of molding and hardening of raw granules. A method for preparing a raw material mass is proposed that minimizes structural defects of porous granules. Possibility of capacity reaction of a raw mixture due to mechanical activation of solid components and introduction of sodium additives is proved. Technological conditions for low-temperature expansion of a multicomponent mixture and production of porous granules with a density of not more than 300 kg/m3 are determined. The formula of molding mixture for obtaining lightweight concrete using a porous aggregate is proposed. The use of liquid glass as a binder in a concrete mixture is preferred. The temperature of concrete hardening is recommended. The technology of porous concrete developed implements multifunctional properties of liquid glass, provides the use of technogenic materials, saving of energy resources.

scholarly journals Improvement of efficiency of use of liquid-glass mixtures. Part 4. Combined strengthening

2019 ◽  
pp. 38-44
Author(s):  
A. N. Krutilin ◽  
Yu. Yu. Huminski ◽  
O. A. Rusevich ◽  
L. V. Kulbitskaya
Keyword(s):  
Liquid Glass ◽  
Chemical Processes ◽  
Technological Properties ◽  
Technological Processes ◽  
Hardening Process ◽  
Physical And Chemical ◽  
Technological Methods ◽  
Glass Mixture ◽  
Combined Methods

Technological methods applied for intensification liquid-glass mixture hardening process are described. Influence of physical and chemical processes at liquid-glass mixtures technological properties are examined. The application of combined methods of hardening the mixture is proposed, as well as examples of such technological processes are given. The effect of combined methods on the technological properties of the mixture is described. The need for more hard research in this area is justified

ON THE PROCESSING OF HEMATITE RAW MATERIALS AT THE KRYVOROZHSK MINING AND PROCESSING PLANT OF OXIDIZED ORE ON TECHNOLOGY OF DIRECT RECOVERY ITmk3

2018 ◽  
pp. 32-37
Author(s):  
P.I. Loboda ◽  
Younes Razaz ◽  
S. Grishchenko
Keyword(s):  
Magnetic Properties ◽  
Cast Iron ◽  
Iron Content ◽  
Raw Materials ◽  
Direct Reduction ◽  
Processing Plant ◽  
High Iron Content ◽  
High Iron ◽  
Direct Restoration ◽  
First Time

Purpose. To substantiate the efficiency of processing hematite raw materials at the Krivoy Rog Mining and Processing Plant of Oxidized Ores using the direct reduction technology itmk3®. Metodology. Analysis of the results of the itmk3® direct restoration technology developed by Kobe Steel Ltd., Japan and Hares Engineering GmbX, Austria, with a view to using it to process Krivbass hematite ores into granulated iron (so-called “nuggets”). Findings. The involvement in the production of hematite ores (oxidized quartzite) of Krivbass with high iron content, but with low magnetic properties for their processing into granular cast iron is grounded. Originality. The use of itmk3® direct reduction technology from Kobe Steel Ltd., Japan and Hares Engineering GmbH, Austria for the processing of Krivbass hematite ores into granular cast iron is justified for the first time. Practical value. The efficiency of the use of hematite ores (oxidized quartzite) has been substantiated, which can significantly reduce the costs in the mining cycle for the economical production of metallurgical products.

PERSPECTIVE DEVELOPMENT OF WORLD PRODUCTION OF FEEDS FOR AQUACULTURE: ALTERNATIVE SOURCES OF RAW MATERIALS

2017 ◽  
pp. 67-78
Author(s):  
Lina Yurievna Lagutkina
Keyword(s):  
Raw Materials ◽  
Limiting Factors ◽  
Current Status ◽  
Feed Production ◽  
The World ◽  
Market Trends ◽  
Alternative Sources ◽  
World Industry ◽  
First Time ◽  
A Current

The author of the article discloses the prospects of development of the world feed production for aquaculture based on the analysis of key innovative technological and market trends. The author specifies that shortage, high cost, low ecological compatibility of traditional raw materials - fish flour - are among major limiting factors in the development of production of feeds for aquaculture. This fact, in turn, limits sustainable development of aquaculture both in Russia, and in the world in general. The article presents the overview of a current status of the world industry of feed production in aquaculture, where the regional situation is studied, as well. For the first time, there is given the outlook of innovative technologies in feed production based on the alternative sources of protein (on the example of projects of leading aquabiotechnological companies) which will determine industry’s objectives for the mid-term perspective.

Safety assessment of biological raw materials in the system of medicines quality assurance

2020 ◽  
pp. 63-72
Author(s):  
Yu. Olefir ◽  
E. Sakanyan ◽  
I. Osipova ◽  
V. Dobrynin ◽  
M. Smirnova ◽  
...  
Keyword(s):  
Raw Materials ◽  
State Level ◽  
The State ◽  
Spongiform Encephalopathy ◽  
Safety Standards ◽  
Wide Range ◽  
The Russian Federation ◽  
Key Aspects ◽  
First Time ◽  
Medicines Quality

The entry of a wide range of biotechnological products into the pharmaceutical market calls for rein-forcement of the quality, efficacy and safety standards at the state level. The following general monographs have been elaborated for the first time to be included into the State Pharmacopoeia of the Russian Federation, XIV edition: "Viral safety" and "Reduction of the risk of transmitting animal spongiform encephalopathy via medicinal products". These general monographs were elaborated taking into account the requirements of foreign pharmacopoeias and the WHO recommendations. The present paper summarises the key aspects of the monographs.

scholarly journals Experimental investigation to characterize simple versus multi scaling analysis of hydraulic conductivity at a mesoscale

2021 ◽  
Author(s):  
Guglielmo Federico Antonio Brunetti ◽  
Samuele De Bartolo ◽  
Carmine Fallico ◽  
Ferdinando Frega ◽  
Maria Fernanda Rivera Velásquez ◽  
...  
Keyword(s):  
Hydraulic Conductivity ◽  
Spatial Variability ◽  
Hydraulic Properties ◽  
Scaling Laws ◽  
Scaling Analysis ◽  
Field Scale ◽  
Porous Formation ◽  
Proper Design ◽  
First Time

AbstractThe spatial variability of the aquifers' hydraulic properties can be satisfactorily described by means of scaling laws. The latter enable one to relate the small (typically laboratory) scale to the larger (typically formation/regional) ones, therefore leading de facto to an upscaling procedure. In the present study, we are concerned with the spatial variability of the hydraulic conductivity K into a strongly heterogeneous porous formation. A strategy, allowing one to identify correctly the single/multiple scaling of K, is applied for the first time to a large caisson, where the medium was packed. In particular, we show how to identify the various scaling ranges with special emphasis on the determination of the related cut-off limits. Finally, we illustrate how the heterogeneity enhances with the increasing scale of observation, by identifying the proper law accounting for the transition from the laboratory to the field scale. Results of the present study are of paramount utility for the proper design of pumping tests in formations where the degree of spatial variability of the hydraulic conductivity does not allow regarding them as “weakly heterogeneous”, as well as for the study of dispersion mechanisms.

scholarly journals Eco-Compatible Construction Materials Containing Ceramic Sludge and Packaging Glass Cullet

2021 ◽  
Vol 11 (8) ◽  
pp. 3545
Author(s):  
Fernanda Andreola ◽  
Isabella Lancellotti ◽  
Paolo Pozzi ◽  
Luisa Barbieri
Keyword(s):  
Raw Materials ◽  
Construction Materials ◽  
Treatment Plant ◽  
Glass Ceramics ◽  
Chemical Properties ◽  
Linear Shrinkage ◽  
Glass Cullet ◽  
Commercial Glass ◽  
Packaging Glass ◽  
And Chemical Properties

This research reports results of eco-compatible building material obtained without natural raw materials. A mixture of sludge from a ceramic wastewater treatment plant and glass cullet from the urban collection was used to obtain high sintered products suitable to be used as covering floor/wall tiles in buildings. The fired samples were tested by water absorption, linear shrinkage, apparent density, and mechanical and chemical properties. Satisfactory results were achieved from densification properties and SEM/XRD analyses showed a compact polycrystalline microstructure with albite and wollastonite embedded in the glassy phase, similar to other commercial glass-ceramics. Besides, the products were obtained with a reduction of 200 °C with respect to the firing temperatures of commercial ones. Additionally, the realized materials were undergone to leaching test following Italian regulation to evaluate the mobility of hazardous ions present into the sludge. The data obtained verified that after thermal treatment the heavy metals were immobilized into the ceramic matrix without further environmental impact for the product use. The results of the research confirm that this valorization of matter using only residues produces glass ceramics high sintered suitable to be used as tile with technological properties similar or higher than commercial ones.

Transparent, ultraflexible, and superinsulating nanofibrous biocomposite aerogels via ambient pressure drying

2021 ◽  
Author(s):  
Guoqing Zu ◽  
Sheng Zeng ◽  
Ben Yang ◽  
Jia Huang
Keyword(s):  
Ambient Pressure ◽  
Ambient Pressure Drying ◽  
Oxidized Starch ◽  
Nanofibrous Structure ◽  
First Time ◽  
Highly Porous

We report transparent, flexible, and superinsulating biocomposite aerogels with a homogeneous, highly porous, and nanofibrous structure based on oxidized starch and polyorganosiloxane via facile ambient pressure drying for the first time.

scholarly journals Mineralogy and Geochemistry of Ultramafic Rocks from Rachoni Magnesite Mine, Gerakini (Chalkidiki, Northern Greece)

Minerals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 934
Author(s):  
Evangelos Tzamos ◽  
Micol Bussolesi ◽  
Giovanni Grieco ◽  
Pietro Marescotti ◽  
Laura Crispini ◽  
...  
Keyword(s):  
Raw Materials ◽  
Mining Area ◽  
Ultramafic Rocks ◽  
Northern Greece ◽  
Icp Ms ◽  
Time In Literature ◽  
History Of ◽  
First Time ◽  
The Eu

The importance of magnesite for the EU economy and industry is very high, making the understanding of their genesis for the exploration for new deposits a priority for the raw materials scientific community. In this direction, the study of the magnesite-hosting ultramafic rocks can be proved very useful. For the present study, ultramafic rock samples were collected from the magnesite ore-hosting ophiolite of the Gerakini mining area (Chalkidiki, Greece) to investigate the consecutive alteration events of the rocks which led to the metallogenesis of the significant magnesite ores of the area. All samples were subjected to a series of analytical methods for the determination of their mineralogical and geochemical characteristics: optical microscopy, XRD, SEM, EMPA, ICP–MS/OES and CIPW normalization. The results of these analyses revealed that the ultramafic rocks of the area have not only all been subjected to serpentinization, but these rocks have also undergone carbonation, silification and clay alteration. The latter events are attributed to the circulation of CO2-rich fluids responsible for the formation of the magnesite ores and locally, the further alteration of the serpentinites into listvenites. The current mineralogy of these rocks was found to be linked to one or more alteration event that took place, thus a significant contribution to the metallo- and petrogenetic history of the Gerakini ophiolite has been made. Furthermore, for the first time in literature, Fe inclusions in olivines from Greece were reported.

scholarly journals Comprehensive Metabolomics Study of Traditionally Important Rumex Species Found in Western Himalayan Region

2018 ◽  
Vol 13 (2) ◽  
pp. 1934578X1801300
Author(s):  
Ritika Sharma ◽  
Rupali Jandrotia ◽  
Bikram Singh ◽  
Upendra Sharma ◽  
Dinesh Kumar
Keyword(s):  
Raw Materials ◽  
Chemical Diversity ◽  
Control Analysis ◽  
Limit Of Quantification ◽  
Western Himalayan Region ◽  
Biological Potential ◽  
Metabolomics Study ◽  
Comprehensive Metabolomics ◽  
First Time ◽  
Concurrent Estimation

Rumex species are traditionally known to cure constipation, pain, inflammation, ulcer and tumor. The biological potential of Rumex nepalens is lies in chemical diversity of its constituents. In the present study, UPLC-DAD-MS method was developed for the concurrent estimation of polyphenols in Rumex species ( R. nepalensis, R. hastatus and R. dentatus) and validated for linearity (r2 > 0.999), limit of quantification and detection, inter and intraday precession, stabilities and recovery. The developed method has also been employed for metabolomic analysis of Rumex species. Qualitative and quantitative variation of polyphenols was observed among the aerial and root parts of Rumex species with highest content of polyphenol detected in aerial part of R. nepalensis. The quantitative data based matrix and HCA plot represents the variation of metabolites among the samples. R. nepalensis being widely used in traditional practices, was incorporated in detail. A total of seven molecules were isolated and characterized among which three compounds viz. 3- O- methyl epicatechin, quercetin-3- O- β-D-glucuronide and β-sitosterol-3- O- β-D-glucoside were isolated for first time from this plant. Eighteen metabolites were profiled in R. nepalensis using UPLC-MS/MS technique. Current comprehensive metabolomics approach will surely help in understanding the chemical diversity, discriminations and quality control analysis of raw materials and furnished products of Rumex.

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