scholarly journals JUSTIFICATION OF METHODS OF POLYMERIC WASTE PROCESSING IN AGRICULTURAL PRODUCTION

2021 ◽  
pp. 97-108
Author(s):  
Yuriy Paladiichuk ◽  
Inna Telyatnuk
Keyword(s):  
Raw Materials ◽  
Physical And Mechanical Properties ◽  
Industrial Complex ◽  
Body Parts ◽  
Polymer Waste ◽  
Processing Technologies ◽  
Plastic Bags ◽  
Mineral Fillers ◽  
Polymeric Waste

The development of industry has led to the unlimited technological application of polymers, ranging from plastic bags, rubber, fabrics, paper and other materials. Displacing traditional materials, polymer products began to be used in agriculture. Polymers are used to make films for soil cover (mulching), anti-hail nets, shaft bushings, gears, body parts, tanks for storage and transportation of fertilizers and working fluids and many other parts. The operational properties of polymer products are becoming more and more perfect, but at the same time the methods of polymer waste management and their utilization are being developed and complicated. Over time, they can no longer be used for their intended purpose, so they are discarded and sent to landfills, while polymers are valuable structural materials and their reuse will not only be positive for the environment, but can also become a profitable branch of the agro-industrial complex. Pellet production is one of the methods of recycling polymer waste, which in the future can be used for the production of new parts, as well as added to the composition of composite materials based on organic or mineral fillers. This article examines the problem of recycling polymer waste by improving their processing technologies. The analysis of existing methods of utilization and processing of polymeric waste generated in agriculture is carried out. Determination of physical and mechanical properties of polymer waste, in particular thermoplastics. Taking into account the received information, conclusions are made and the analysis of methods of utilization and processing of polymeric waste in secondary raw materials is carried out.

scholarly journals Features of the material composition and possible technologies of pyrite cinders processing

2021 ◽  
pp. 22-28
Author(s):  
MAKAROV Anatoly Borisovich ◽  
◽  
KHASANOVA Gul’nara Gabdulbarievna ◽  
GLUKHOV Mikhail Sergeevich ◽  
PAN’SHIN Maksim Andreevich ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Research Study ◽  
Raw Materials ◽  
Energy Dispersive Spectrometer ◽  
Material Composition ◽  
Processing Technologies ◽  
Ore Processing ◽  
Impurity Elements ◽  
Pyrite Cinders

Relevance of research is determined by the need to study for subsequent rational processing of technogenic mineral raw materials – pyrite cinders formed during firing pyritic concentrates for the production of sulfuric acid. Topical issues here are the determination of their chemical and mineral composition, morphology of particles, which predetermine possible technologies of their processing. Purpose of research – study of the material composition of pyrite cinders of the dumps of the Kirovgrad coppersmelting plant, features identification of the composition of different-age dumps. Methods of research. In the selected samples of pyrite cinders, their chemical composition was determined, the morphology of particles was studied by photographing them using the Philips XL-30 electron microscope equipped with an energy dispersive spectrometer (EDS), and possible processing technologies were analyzed. Results. It was found that pyrite cinder of the old dump (no. 1) is characterized by low SO3 contents and low values of losses when firing relative to dump no. 2, which is determined by the oxidation of residual pyrite, as well as CaO and higher Fe2 O3 contents. The study of the morphology of pyrite cinders microparticles showed that they have an irregular shape, globule shape and spherical size from 40 μm to 2 mm. Some known technologies of purple ore processing are considered. Conclusion. The morphology of pyrite cinders particles and their chemical composition were determined as a result of the research. Taking into account the research results and morphostructural characteristics of cinders material, in particular, it is obvious that a number of technologies can be chosen for their complex processing; at the same time this determines further directions of their research, for example, the study of valuable impurity elements in them and their behavior in the process of changing the material of the dumps.

Criteria for the Selection of Synthetic Polymeric Waste as a Raw Material for Producing Carbon Sorbents with Predetermined Properties

2020 ◽  
Vol 24 (10) ◽  
pp. 13-19
Author(s):  
Ya.I. Vaisman ◽  
I.S. Glushankova ◽  
L.V. Rudakova ◽  
A.A. Surkov ◽  
A.S. Atanova
Keyword(s):  
Raw Materials ◽  
Synthetic Polymer ◽  
Raw Material ◽  
Technological Parameters ◽  
Polymer Waste ◽  
Factors Affecting ◽  
Carbon Sorbents ◽  
Degree Of Aromaticity ◽  
Polymeric Waste ◽  
Selection Of

The results of studies on the thermal processing of synthetic multi-tonnage polymeric waste (polypropylene, polycarbonate, textolite, PET, organoplastics and tire rubber) with the production of carbon sorbents for technological and environmental purposes are presented. The influence of the nature of the activating agent and the conditions of the process with the production of sorbents with predetermined properties was studied. Analysis of the research results allowed us to establish that the main factors affecting the yield of carbonizate and the formation of a porous structure of carbon sorbents from synthetic polymer waste are the degree of aromaticity and the location of benzene rings in the polymer structure, the proportion of oxygen in the precursor. The criteria for selecting synthetic polymer wastes as raw materials for obtaining carbon sorbents with predetermined properties are established. The results of the research can be used in the development of technologies for obtaining carbon sorbents with predetermined properties from waste synthetic polymers and the selection of technological parameters for processes.

scholarly journals Determination of the Chemical, Physical and Mechanical Characteristics of Electric Arc Furnace Slags and Environmental Evaluation of the Process for Their Utilization as an Aggregate in Bituminous Mixtures

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 782 ◽  
Author(s):  
Juan María Terrones-Saeta ◽  
Jorge Suárez-Macías ◽  
Evaristo Rafael Moreno-López ◽  
Francisco Antonio Corpas-Iglesias
Keyword(s):  
Raw Materials ◽  
Physical And Mechanical Properties ◽  
Road Construction ◽  
Electric Arc Furnace ◽  
Electric Arc ◽  
Arc Furnace ◽  
Environmental Evaluation ◽  
Bituminous Mixtures ◽  
Electric Arc Furnace Slag

Road construction is an activity that demands a significant amount of aggregates for bituminous mixtures. In addition, these aggregates must be of a suitable quality for use, even more so on high traffic roads. In response to this problem, and in order to avoid the extraction of new raw materials, research is being carried out using industrial waste as a substitute for conventional aggregates. In this way, the extraction of raw materials is reduced and landfilling of waste is avoided. However, these wastes must have certain properties and environmental advantages over natural aggregates. Otherwise, the use of waste would not be environmentally beneficial but would be more damaging to the environment. For this reason, this research evaluates the viability of using electric arc furnace slag as aggregates for bituminous mixtures, the main objectives being the determination of the characteristics of the by-product, the particularities and the critical points to be taken into account for its subsequent use in mixtures. At the same time, the environmental advantages of treating this waste to obtain a usable aggregate are evaluated in comparison with the processing of a natural aggregate. The results showed that electric arc furnace slags have a suitable chemical composition and excellent physical and mechanical properties for use in bituminous mixtures, even on high traffic roads. At the same time, it was determined that their use produces a considerable reduction in environmental afflictions. Therefore, it could be affirmed that the use of electric arc furnace slags in bituminous mixtures is recommendable as a way to develop more sustainable materials for construction.

scholarly journals Sorption properties of materials based on residual biomass

2018 ◽  
Vol 245 ◽  
pp. 18005 ◽  
Author(s):  
Yulia Smyatskaya ◽  
Arina Kosheleva ◽  
Elena Taranovskaya
Keyword(s):  
Heavy Metals ◽  
Sorption Capacity ◽  
Raw Materials ◽  
Lemna Minor ◽  
Physical And Mechanical Properties ◽  
Sorption Properties ◽  
Industrial Complex ◽  
Vegetable Waste ◽  
Residual Biomass ◽  
Sorption Material

In this paper, we consider the possibility of using inexpensive and effective sorption materials based on plant raw materials, such as fruit rind, vegetable waste, fallen leaves, and the use of phytosorbents for the purification of sewage containing heavy metals and petroleum products. The use of vegetable waste for the manufacture of sorbents is a priority for solving environmental problems. It is suggested to use residual biomass as a sorption material, which is formed after extraction of lipids from C. sorokiniana microalgae and duckweed Lemna minor. To increase the sorption capacity, it was proposed to thermally modify the residual biomass. The optimum heat treatment conditions were 450 °C for 20 minutes with limited access to oxygen. The obtained biomass allows one to extract ions of heavy metals with efficiency of 91-93% for ions of lead, cadmium, zinc and copper. To increase the sorption capacity (A, mg/g) of the residual biomass, heat treated waste from the agro-industrial complex and chitosan were proposed as additives. The addition of chitosan makes it possible to obtain a sorption material in the form of granules, which is convenient to use. For the sorption materials obtained, microstructural studies were carried out, which allowed us to substantiate the sorption properties of the materials. The physical and mechanical properties of sorbents, such as abrasion, grindability, allow us to offer new materials for use on an industrial scale. In the article, a technological scheme for obtaining sorption materials from residual biomass is given.

scholarly journals ANALISYS OF SOLID STRESS-STRAIN BEHAVIOR WHEN PROTECTIVE PILLAR OF VERTICAL SHAFT IS DEVELOPED

2019 ◽  
Vol 2 (4) ◽  
pp. 200-211
Author(s):  
Sergey Neverov ◽  
Yuri Shaposhnik ◽  
Alexander Hikolsky
Keyword(s):  
Raw Materials ◽  
Ground Surface ◽  
Physical And Mechanical Properties ◽  
Structural Features ◽  
Negative Consequences ◽  
Mine Shaft ◽  
Strain Behavior ◽  
Element Simulation ◽  
Barrier Pillar

In the context of the paper, carried out study complex is devoted to geomechanical estimation of safe development of ore reserves including barrier pillar within protective pillar of shaft of Irtishskaya Ore Mine with determination of influence rate of occurring stresses and strains in a solid on its condition and on capital workings and ground surface. Due to absence of active reserve reproduction of mineral raw materials at active ore mines, issues of pillar redevelopment become extremely important. It is established that in some deposits, losses in boundaries of protective pillars for protective objects reach 30 and more percent from balanced reserves. The possibility of safe extraction of parts of reserves from protective pillar of shaft without negative consequences for mine operation and for objects located at daylight surface is justified, based on analytical solutions and finite-element simulation in terms of Irtishskaya Mine. The most significant issue in the paper is using of mathematical simulation considering geo-structural features of the deposit, solid lithology, physical and mechanical properties of rock geo-metrical difficulty of mining objects and regulatory documentation for significant of extension of knowledge about studying of stability estimation of workings and ground surface. It is established that as main safety way for mine shaft ore barrier pillars should be leaved when reserves from protective pillar is depleted.

scholarly journals Physical Properties of Mineral and Recycled Aggregates Used to Mineral-Asphalt Mixtures

Materials ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3437 ◽  
Author(s):  
Wojciech Andrzejuk ◽  
Danuta Barnat-Hunek ◽  
Jacek Góra
Keyword(s):  
Raw Materials ◽  
Physical And Mechanical Properties ◽  
Asphalt Mixtures ◽  
Recycled Aggregates ◽  
Chemical Components ◽  
Test Results ◽  
Eds Analysis ◽  
Road Surfaces ◽  
Microstructure Examination

This article presents test results and examines the possibilities of using aggregate from ceramic waste for mineral-asphalt mixtures. In addition, the mineral composition, physical and mechanical properties of aggregates from natural raw materials such as dolomite, granodiorite and waste ceramic aggregate (introduced as a partial substitute for the main aggregate) were analyzed. The shape of grains was examined by determining the shape and flatness index of aggregates, resistance to grinding and frost resistance. The tested properties have a direct impact on the durability of road surfaces. To this end, the adhesion of asphalt to the surface of the aggregates used was additionally determined. Determination of surface roughness and two-dimensional (2D) topography of tested aggregates was carried out. The aggregates microstructure examination, coupled with the energy-dispersive X-ray spectroscopy (EDS) analysis, was conducted to determine the morphology and texture of the aggregates as well as to identify the basic chemical components.

Determination of Proximate Composition of Malaysian Horseshoe Crab (Tachypleus gigas)

2021 ◽  
Vol 1025 ◽  
pp. 128-133
Author(s):  
Nashrin Iszhan ◽  
Farah Nurshahida Mohd Subakir ◽  
Nazikussabah Zaharudin
Keyword(s):  
Proximate Composition ◽  
Horseshoe Crab ◽  
Human Hand ◽  
Body Parts ◽  
Plastic Bags ◽  
Good Nutrition ◽  
Nutrition Value ◽  
Foreign Materials ◽  
Nutrition Source

This study was conducted to investigate proximate content of horseshoe crab (Tachypleusgigas) in Malaysia. To date, there has been little agreement on what the nutrition value of horseshoe crab is and how it will benefit the consumers. The samples were divided by two parts, which are roe and muscle. The Tachypleusgigas was cleaned of foreign materials and impurities manually by human hand. The samples were ground into flour and sieved through 50 μm sieve and were packaged in airtight plastic bags prior to analyses. The horseshoe crab was analyzed for its proximate composition of different body parts. The results showed that the roe and muscle of Tachypleusgigas contained moisture (50.45 % and 73.67 %), ash (0.41 % and 2.72 %), crude proteins (38.24 % and 14.62 %), crude fats (9.30 % and 8.09 %), carbohydrates (1.67 % and 0.91 %) and energy (241.42 Kcal/100 g and 134.43 Kcal/100 g), respectively. This shows that roe has better nutrition content since it has higher protein, fat and carbohydrate content, which are the main energy-providing nutrient. Overall, the proximate content of Tachypleusgigas was nearer to the shellfish rather than the finfish and can be considered as a good nutrition source.

Determination of Combined and Second Order Factor Effects for Simultaneous Optimization of Physical and Mechanical Properties of NR/BR Blend System

2014 ◽  
Vol 42 (4) ◽  
pp. 290-304
Author(s):  
Rajarajan Aiyengar ◽  
Jyoti Divecha
Keyword(s):  
Physical And Mechanical Properties ◽  
Second Order ◽  
Simultaneous Optimization ◽  
Order Effects ◽  
Elongation At Break ◽  
Five Factors ◽  
Rubber Compounds ◽  
Polybutadiene Rubber ◽  
Contour Plots

ABSTRACT The blends of natural rubber (NR), polybutadiene rubber (BR), and other forms of rubbers are widely used for enhancing the mechanical and physical properties of rubber compounds. Lots of work has been done in conditioning and mixing of NR/BR blends to improve the properties of its rubber compounds and end products such as tire tread. This article employs response surface methodology designed experiments in five factors; high abrasion furnace carbon black (N 330), aromatic oil, NR/BR ratio, sulfur, and N-oxydiethylene-2-benzothiazole sulfenamide for determination of combined and second order effects of the significant factors leading to simultaneous optimization of the NR/BR blend system. One of the overall optimum of eight properties existed at carbon 44 phr, oil 6.1 phr, NR/BR 78/22 phr with the following values of properties: tensile strength (22 MPa), elongation at break (528%), tear resistance (30 kg/mm), rebound resilience (67%), moderate hardness (68 International rubber hardness degrees) with low heat buildup (17 °C), permanent set (12%), and abrasion loss (57 mm3). More optimum combinations can easily be determined from the NR/BR blend system models contour plots.

Basic set of experiments for determination of mechanical properties of sand

2014 ◽  
Vol 62 (1) ◽  
pp. 129-137
Author(s):  
A. Sawicki ◽  
J. Mierczyński
Keyword(s):  
Mechanical Properties ◽  
Soil Mechanics ◽  
Physical And Mechanical Properties ◽  
Local Strain ◽  
Initial State ◽  
Laboratory Equipment ◽  
Additional Information ◽  
Basic Set ◽  
Initial Anisotropy

Abstract A basic set of experiments for the determination of mechanical properties of sands is described. This includes the determination of basic physical and mechanical properties, as conventionally applied in soil mechanics, as well as some additional experiments, which provide further information on mechanical properties of granular soils. These additional experiments allow for determination of steady state and instability lines, stress-strain relations for isotropic loading and pure shearing, and simple cyclic shearing tests. Unconventional oedometric experiments are also presented. Necessary laboratory equipment is described, which includes a triaxial apparatus equipped with local strain gauges, an oedometer capable of measuring lateral stresses and a simple cyclic shearing apparatus. The above experiments provide additional information on soil’s properties, which is useful in studying the following phenomena: pre-failure deformations of sand including cyclic loading compaction, pore-pressure generation and liquefaction, both static and caused by cyclic loadings, the effect of sand initial anisotropy and various instabilities. An important feature of the experiments described is that they make it possible to determine the initial state of sand, defined as either contractive or dilative. Experimental results for the “Gdynia” model sand are shown.

Usability of field X-ray fluorescence analyzers for determination of the chemistry of cement raw materials - using an example of Mokrá Quarry

2016 ◽  
Author(s):  
Jiří Zimák ◽  
Kristýna Dalajková ◽  
Roman Donocik ◽  
Petr Krist ◽  
Daniel Reif ◽  
...  
Keyword(s):  
Raw Materials ◽  
X Ray
Sign in / Sign up

Export Citation Format

Share Document