Effect of Addition of Chopped Needles on the Fiberboard Quality Indicators

Until recently, only the trunk of a tree was recognized as valuable in the forest industry, and everything else, including the crown, was considered waste. Logging wastes cluttered felling sites and created a favorable environment for habitation and reproduction of forest pests, as well as contributed to the emergence of forest fires. Today, wood greens are used as a raw material in the logging industry for the production of pellet fuels; in the woodchemical complex for the manufacture of chlorophyll-carotene pastes, sodium chlorophyllin, and coniferous healing extract; in agro-industrial production to obtain coniferous vitamin flour. Analysis of literature sources showed that fibreboards are widely used in housing construction as structural, finishing, and insulating materials. The advantage of fibreboards is the ability to impart special properties to them, such as fire resistance, water resistance, biostability, soundproofing, and heat-insulating ability by adding various components to the fibreboard at the manufacturing stage. Studies of the effect of adding coniferous flour on the quality indicators and physical and mechanical parameters of the finished fiberboard have been carried out in order to solve the problem of expanding the raw material base for fiberboard production. The possibility of using this raw material in the form of coniferous flour in the production of fiberboard has been substantiated. The influence of the percentage of needle flour in the total volume of wood fiber pulp and particle size on the qualitative indicators of the material is shown. Statistical and mathematical equations and graphical dependencies have been obtained. They allow predicting the indicators of fiberboards for a given content and particle size of flour from coniferous greens. The optimal size of the particles of coniferous flour and its content in the fibreboard at which the values of physical and mechanical indicators of the finished product meet the requirements of the State Standard GOST 4598-86 are determined. For citation: Zyryanov M.A., Medvedev S.O., Mokhirev A.P. Effect of Addition of Chopped Needles on the Fiberboard Quality Indicators. Lesnoy Zhurnal [Russian Forestry Journal], 2021, no. 3, pp. 125–132. DOI: 10.37482/0536-1036-2021-3-125-132

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НАПІВФАБРИКАТИ ІЗ НЕДЕРЕВНОЇ СИРОВИНИ ДЛЯ ВИГОТОВЛЕННЯ ПАПЕРУ

Bulletin of the Kyiv National University of Technologies and Design Technical Science Series ◽

10.30857/1813-6796.2020.4.13 ◽

2021 ◽

Vol 148 (4) ◽

pp. 140-148

Author(s):

Р. І. Черьопкіна ◽

І. В. Трембус ◽

І. М. Дейкун

Keyword(s):

Sodium Hydroxide ◽

Quality Indicators ◽

Raw Materials ◽

Lignin Content ◽

Wood Fiber ◽

Raw Material ◽

Practical Significance ◽

Material Base ◽

Technological Parameters ◽

Standard Methods

The main objectives of scientific work is to study the technological parameters of the sodium hydroxide method of delignification of non-wood raw materials and production of fibrous first stuff for the manufacturing of packaging types of paper. Methodology. For the research, rapeseed stalks, sodium hydroxide cooking, anthraquinone catalyst were used. The brews were cooked in steel autoclaves, which were lowered into a glycerin bath. Standard methods for the determination of the quality indicators (yield and residual lignin content) of non-wood fiber first stuff were used. As a mathematical data processing method, the generalized reduced gradient method was used. Laboratory samples of castings of fibrous first stuff and paper were made on a LA-2 sheet-making apparatus, the mechanical parameters of the outturn sheet were determined according to the standard methods using appropriate instruments. Results. The expediency of using rapeseed stalks for processing of fibrous first stuff under alkaline conditions has been proven. It was found that the greatest influence on the delignification of raw materials has the raise of cooking temperature from 80 to 120 ° C and the use of the anthraquinone catalyst. It has been shown that the obtained rapeseed first stuff have sufficient paper-forming properties and are suitable for use in the production of MS 5B brand paper for the use in the production of fluting paper or board of B-3 grade. The scientific novelty of the work is due to the environmental friendliness of the agrowaste processing as an alternative raw material for the production of fibrous first stuff at low cooking temperatures. Using rapeseed stalks as an example, the influence of technological parameters on the quality indicators of first stuff was studied. Using the mathematical methods of the processing of experiment data, the optimal ratio of fibrous first stuff /waste paper at which the strength indicators of fluting paper or board will meet the standards was determined. Practical significance. Research results has shown the expediency of using oilseed wastes for processing of fibrous first stuff , with the aim of expanding the raw material base of cardboard and paper production.

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Raw material base for coking of the Coke Production of PJSC "ARCELORMITTAL KRYVYI RIH" in the period from 2017 to 2021.

Journal of Coal Chemistry ◽

10.31081/1681-309x-2021-0-4-4-9 ◽

2021 ◽

Vol 4 ◽

pp. 4-9

Author(s):

N.V. Mukina ◽

D.V Miroshnichenko

Keyword(s):

Quality Indicators ◽

Coke Oven ◽

Ash Content ◽

Raw Material ◽

Material Base ◽

Chemical Production ◽

Total Sulfur Content ◽

Blast Furnace Coke ◽

Coal Charge ◽

Furnace Coke

RAW MATERIAL BASE FOR COKING OF THE COKING PRODUCTION OF PJSC "ARCELORMITTAL KRYVYI RIH" IN THE PERIOD FROM 2017 TO 2021 © N.V. Mukina (Coke-chemical production of PJSC "ArcelorMittal Kryvyi Rih", 50095, Dnepropetrovsk region, Kryvyi Rih, Krivorozhstal st., 1, Ukraine), D.V. Miroshnichenko, Doctor of Technical Sciences (NTU "Kharkiv Polytechnic Institute", 61002, Kharkiv, st. Kirpicheva, 2, Ukraine) The article presents the data on coal components that were used in the charge for coking coke oven batteries №№1-4 (bulk coal charge) and №№ 5, 6 (tamped coal charge) of the coke-chemical production of PJSC "ArcelorMittal Kryvyi Rih" in the period from 2017 to 2021, as well as averaged information on some quality indicators of the produced coke. In general, the coal raw material base of the enterprise for the last five years has been of a stable inter-basin nature with a predominance of coals from the USA, Kazakhstan, and the Russian Federation. It is shown that, as the tamping technology suggests, moisture content, bulk density and content of classes less than 0.16 and less than 3.0 mm in coal charges supplied to the coal waste plant. №№ 5, 6 are significantly higher than the values of similar indicators of coal charges supplied to the numbers 1-4. Along with this, due to the use of coals of a certain quality, ash content, total sulfur content and the thickness of the plastic layer in coal charges supplied to the coal bunker №№ 1-4, is slightly higher than similar indicators of coal charges supplied to the boiler №№ 5, 6. In total, during 2017-2021, the composition and quality indicators of the coal charge for the production of coke at the boiler plant №№ 1-4 practically did not change, while in the coal charge for the production of coke on coke oven batteries №№ 5, 6 there is a decrease in the share of highly volatile coals with a simultaneous increase in the content of medium-volatile and low-volatile components. The given values of the quality indicators of the obtained blast-furnace coke indicate that the use of tamping technology makes it possible to obtain blast-furnace coke of a higher quality than by using a traditional technology. In particular, the coke obtained at the oven batteries №№ 5, 6 are characterized by lower values of ash content, total sulfur content and abrasion (M10) with higher values of mechanical strength in terms of M25 and post-reaction strength (CSR). Keywords: coal, inter-basin raw material base, coking, charge tamping, coke quality. Corresponding author N.V. Mukina, е-mail: [email protected]

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Composite material based on andesite of Transcarpathia

Кераміка наука і життя ◽

10.26909/csl.3.2020.2 ◽

2020 ◽

pp. 13-17

Author(s):

L.I. Melnyk ◽

L.P. Chernyak ◽

O.V. Kozlovets

Keyword(s):

Particle Size ◽

Composite Material ◽

Composite Materials ◽

Raw Material ◽

Material Base ◽

Adhesion Forces ◽

Resource Saving ◽

Abrasive Resistance ◽

Quantitative Ratio ◽

By Products

Composite materials for various purposes are made on the basis of initial mixtures of fillers and bonding components. The varieties of these components and their quantitative ratio determine the qualitative indicators of the composite. This causes rosettes of the raw material base for the production of composites, including the use of by-products of mineral extraction, which meets the objectives of resource saving. This paper presents the results of the study of composite materials on the basis of by-products of extraction of igneous rocks of Transcarpathia - siftings of andesite as a filler and copolymer Latex 2012 as a matrix. The analysis of chemical and mineralogical composition of andesite siftings from Khust quarry was carried out. An analysis of the dependence of the main physical and mechanical characteristics of the studied composites on the concentration of andesite in the range of 55-85 wt. % and of the corresponding change in the quantitative ratio of filler and copolymer is performed. Differences in parameters using andesite samples with different particle size distribution (the poly-fractional with particle size ˂ 3 mm and the dispersion one with particle size ˂ 0.5 mm) were determined. The peculiarities of the formation of the pore structure of the composite material obtained using andesite samples of different granulometry connected with the increasing degree of dispersion associated with the increase in the number of filler particles in the composite, increasing adhesion forces in the copolymer-filler system and increasing of surface energy of andesite particles are shown. The possibility of increasing the abrasive resistance of the composite material when using the initial mixture based on the andesite-copolymer system has been experimentally confirmed.

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EFFECT OF BULK DENSITY OF COAL BLEND ON THE CALORIFIC VALUE OF COKE

Journal of Coal Chemistry ◽

10.31081/1681-309x-2020-0-6-4-12 ◽

2020 ◽

Vol 6 ◽

pp. 4-12

Author(s):

I.V. Miroshnichenko ◽

D.V. Miroshnichenko ◽

I.V. Shulga ◽

Yu.V. Nikolaychuk

Keyword(s):

Bulk Density ◽

Quality Indicators ◽

Calorific Value ◽

Dry Weight ◽

Raw Material ◽

State Enterprise ◽

Water Molecules ◽

Material Base ◽

Gross Calorific Value ◽

Coal Blend

The article is devoted to laboratory studies to determine the influence of the bulk density of a coal blend (in particular, tamped) on the value of the gross calorific value of the coke obtained from it. To making up a model coal blends, coal concentrates has been selected and analyzed from the raw material base of Ukrainian coke enterprises. From the studied coals four variants of coal blends has been formed, characterized by different grades. Experimental coking of coal charges has been carried out in a 5-kg laboratory oven designed by the State Enterprise "UKHIN". The bulk coking blend has been moistened to 8 %. The blend for tamping has been moistened to 12 %, tamped into a special matrix to a density of 1.15 t/m3 , and then the tamped coal cake has been placed in a retort for coking. It has been established that the maximum value of the gross calorific value of blast-furnace coke is achieved during coking of coal blends, which are characterized by the following set of quality indicators: R0=0,91–0,94 %; Vdaf = 30,9-31,0 %; C daf = 83,80-83,83 %; Hdaf = 5,01-5,02 %; Od daf = 8,42-8,45 %. It has been shown that an increase in the bulk density of coal blends, characterized by the same set of quality indicators, from 800 to 1150 kg/m3 leads to an increase in the gross calorific value of blastfurnace coke by 0,05-0,12 MJ/kg. Hydrogen bonds are a factor that contributes to the denser packaging of coal grains in the load. For this, the number of water molecules must correspond to the number of polar bonds in carbon macromolecules. With a lack of water, not all polar functional groups present in macromolecules will participate in the formation of new bonds, which will not allow to the coal grains to be packed more tightly. On the contrary, at higher humidity, excess water molecules will take up space in the feed, not participating in the formation of bonds with carbon macromolecules, which will lead to a decrease in the bulk density in terms of dry weight.

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RESEARCH OF THE RAW MATERIAL BASE IN THE VINNITSA REGION

ENGINEERING, ENERGY, TRANSPORT AIC ◽

10.37128/2520-6168-2019-4-6 ◽

2019 ◽

pp. 40-46

Author(s):

Alla Solomon ◽

Yurii Polievoda ◽

Mariana Bondar

Keyword(s):

Quality Indicators ◽

Dairy Products ◽

Raw Materials ◽

Animal Health ◽

Raw Milk ◽

First Grade ◽

Raw Material ◽

Hazardous Substances ◽

Material Base ◽

Mineral Salts

The safety of milk and dairy products as a whole can be determined by a comprehensive indicator - animal health. Thus, in accordance with modern international requirements, the farm where raw milk is produced for the production of dairy products must: comply with the rules of hygiene and veterinary sanitation; meet the requirements of good manufacturing practice; carry out identification and registration of animals; ensure proper documentation on the receipt of feed, hygiene and sanitation of medicines; to monitor in the pre-fermer laboratory the quality and safety of milk; compulsory registration of feeds coming from animals because of the feed that can cause human health hazardous substances (hormones, antibiotics, etc.); record veterinary medicinal products used for the treatment of animals; to record the occurrence of those diseases in animals that threaten the safety of milk. EU standards require strict compliance with food safety and quality requirements. The country, which cannot keep track of all stages of production, is closed to the European market. The analysis of quality indicators of milk received for processing is made. It has been established that milk from households has low quality indicators. Higher- and first-grade milk comes from agricultural enterprises. Milk quality means its high hygienic performance, the content of a certain amount of protein, fat, vitamins, enzymes, hormones, mineral salts and other substances. It should not contain any neutralizing substances (antibiotics, soda, hydrogen peroxide). The content of heavy metals, pesticide residues should not exceed the maximum permissible level. Therefore, the safety of raw materials is a guarantee of the safety of finished products in the domestic market and its competitiveness in foreign markets.

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Modeling the Production Processes of Wood-Fiber Semi-Finished Products Aimed at Expansion of the Raw Material Base of Forest Enterprises

Lesnoy Zhurnal (Forestry Journal) ◽

10.37482/0536-1036-2020-5-176-183 ◽

2020 ◽

pp. 176-183

Author(s):

M.A. Zyryanov ◽

◽

S.O. Medvedev

Keyword(s):

Wood Fiber ◽

Acetic Acid Solution ◽

Wood Pulp ◽

Wood Chips ◽

Raw Material ◽

Hydrodynamic Resistance ◽

Aqueous Environment ◽

Grinding Process ◽

Material Base

Currently, materials made of wood-fiber semi-finished products are widely used in house building as structural, finishing and insulating materials. According to the results analysis of numerous studies, the raw material for their production is technological chips of woodworking waste. While production, the chips are subjected to hydrothermal treatment and further grinding in disk knife grinding machines in two stages. Significant energy consumption of the wood fiber production process is driven not only by grinding wood chips in stages, but also by overcoming the hydrodynamic resistance of the aqueous environment, where grinding is carried out. The process of grinding wood chips, made of from chopping residues, in an aerodynamic medium on an upgraded cross-bar mill was studied in order to solve the problem of expanding the raw material base for the production of a wood fiber semifinished product and reducing the energy intensity of the grinding process. The features of this process were analyzed and its effectiveness was assessed. The influence of the exposure time of wood chips of chopping residues in an acetic acid solution, the size of the working gap and the angle of inclination of the front edge of the knife on the grinding degree and fractional quality of wood pulp grinding was determined. Statistical and mathematical equations, that describe the studied process, were obtained, and the graphical dependencies are constructed. The following basic requirement is fulfilled for the dependencies: the experimental points for a total should lie quite close to the curve. These equations allow predicting the quality of wood pulp depending on the set modes of the grinding process; as well as determining the quality indicators of wood pulp with known values of the technological and structural parameters of the grinding machine. The efficiency of the process of obtaining the wood-fiber semi-finished product in an aerodynamic environment from wood chips produced as a result of chopping residues (branches, twigs, etc.) processing in a mobile wood chipper, is proven.

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Storage Problems of Poplar Chips from Short Rotation Plantations with Special Emphasis on Fungal Development

Acta Silvatica et Lignaria Hungarica ◽

10.2478/v10303-012-0010-7 ◽

2012 ◽

Vol 8 (1) ◽

pp. 123-132 ◽

Cited By ~ 9

Author(s):

Zsuzsanna Horváth ◽

Béla Marosvölgyi ◽

Christine Idler ◽

Ralf Pecenka ◽

Hannes Lenz

Keyword(s):

Particle Size ◽

Health Risk ◽

Dry Matter ◽

Ph Value ◽

Wood Chips ◽

Raw Material ◽

Special Focus ◽

Fungal Development ◽

Short Rotation ◽

Fungal Particles

Abstract - There are several problems in storing wood chips freshly harvested from short rotation plantations, which result in quality losses as well as in dry matter and energy losses. The factors influencing the degradation of raw material are examined in this paper with special focus on fungal development. An excessive growth of fungi is connected to dry matter losses and also to an increased health risk during raw material handling. The following factors were measured during 6 months storage of poplar wood chips depending on particle size: box temperature, moisture content, pH-value, appearance of fungi in the storage and the concentration of fungal particles in the air. The results show a close connection between particle size, temperature and attack of fungi. During the storage mesophilic and termophilic species of the genera Alternaria, Aspergillus, Cladosporium, Mucor and Penicillium appeared. The concentration of fungal particles is the highest for fine chips and decreases in bigger particles. There was a special focus on the investigation of the properties of coarse chips (G 50), which represent a good compromise between handling, storage losses and health risk due to fungal development.

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