scholarly journals DEVELOPMENT OF PREPARATIONS BASED ON LOCAL COMPONENTS FOR DUST SUPPRESSION ON QUARRY ROADS

2021 ◽  
pp. 24-29
Keyword(s):  
Raw Materials ◽  
General View ◽  
Dust Suppression ◽  
Industrial Installation

The aim of the work is to develop dust-collecting preparations based on local raw materials for the suppression of man-made dust formed on quarry paths. For this purpose, 4 types of the drug were created in the laboratory on the basis of domestic raw materials for dust suppression. The dependence of the viscosity and density of the created preparations on the concentration of components and temperature is studied. For the preparation of the solution of the created drug, a semi-industrial installation is created, which presents the general view and the process of preparing the solution. The spray of the prepared solution on quarry roads with the help of a special BelAZ machine is given and the analysis of the obtained results is performed

scholarly journals GENERAL PLANNING OF MINERAL RAW MATERIALS PRODUCTION COSTS AND ECONOMIC EVALUATION OF ORE DEPOSITS

2021 ◽  
Vol 14 (27) ◽  
Author(s):  
Radule Tošović
Keyword(s):  
Economic Evaluation ◽  
Raw Materials ◽  
Market Price ◽  
Special Problem ◽  
Ore Deposits ◽  
Production Costs ◽  
General View ◽  
Mineral Raw Materials ◽  
Future Production ◽  
Definition Of

Material production of mineral raw materials is accompanied by specific costs, the general consideration of which is necessary as part of long-term production planning. A special problem that accompanies the definition of these costs is that their planned consideration must be performed much earlier before the start of the production in question. Already in the phase of geological exploration and finding of the ore deposit, a projection of economic profitability must be made, which should enable the relationship between the market price of mineral raw materials and production costs, because the continuation of exploration depends on such a positive result. A special problem arises in the case when due to the low level of exploration there are not enough elements for cost definition of future production. This paper analyzes the application of the method of economic evaluation of deposits, as a complex system of sets of factors and sets of indicators, which allows direct, or in combination with the method of analogy, general view of the costs of future mineral production.

scholarly journals DEVELOPMENT OF ACTIVATED CARBON PRODUCTION TECHNOLOGY FROM A FLAX STALKS BY A THERMOLYSIS-IMPULSE METHOD

2021 ◽  
Author(s):  
E. Berger ◽  
◽  
I. Lilevman ◽  
O. Lilevman
Keyword(s):  
Mathematical Model ◽  
Activated Carbon ◽  
Process Parameters ◽  
Raw Materials ◽  
Industrial Plant ◽  
Activation Process ◽  
Industrial Installation ◽  
Impulse Method ◽  
Selection Of

Purpose of the study is to develop a technology and research and industrial plant for the production of activated carbon by thermolysis-impulse method from a non-traditional source of raw materials – flax stalks. Research methods. Analysis of the chemical composition of flax fire, as well as the current level of its use; disclosure of the activation process and study of the porous structure of sorbents; selection of the optimal method and modes of activation of carbonaceous materials; consideration of methods of activation and study of the mechanism of this reaction; analysis of modern equipment, design and selection of equipment that is most effective in the conditions of flax plants of Ukraine; determination of energy balance of pulse installation; construction of a mathematical model of the process; drawing up a program for computer determination of regression coefficients and on the basis of performed calculations development of nomograms for graphical determination of technological process parameters; study of the influence of technological factors on the physico-chemical characteristics of the obtained activated carbon using the proposed technology and pulse installation that implements it. The results of the study. As a result of research: - developed technology and research and industrial installation for the production of activated carbon by thermolysis-impulse method from a non-traditional source of raw materials - flax stalks; - the optimal technological modes of the activation process are proposed; - the mathematical model of process is created and the nomograms for definition and the forecast of final characteristics of sorbents on input parameters of a technological mode are developed. The expected economic effect for the first year of introduction of the thermolysis-impulse type installation for processing flax stalks into sorbents reaches UAH 2030765. (in 2020 prices). The payback period of the implemented installation is 2.5 months. Conclusions. Using the research results, developed technology and research and industrial installation, it is possible to activate charcoal from flax stalks by thermolysis-impulse method and select the optimal process parameters within the specified temperature and time limits. The obtained activated carbon is applicable for absorption of relatively large molecules or microsuspensions from liquid media. On the basis of the researched materials of this work it is expedient to recommend the offered industrial technological scheme of process of thermolysis-impulse processing of a flax stalks in sorbents.

scholarly journals PREDICTION OF OPERATING PARAMETERS OF EQUIPMENT AT CHEMICAL PRODUCTION BY THE METHOD OF PAIRED POINTS

2020 ◽  
Vol 1 (14) ◽  
pp. 36-38
Author(s):  
Aleksey Bal'chugov
Keyword(s):  
Carbon Monoxide ◽  
Raw Materials ◽  
Production Equipment ◽  
Operating Parameters ◽  
Chemical Production ◽  
Industrial Installation ◽  
Exchange Surface

Prediction of various parameters of operation of chemical production equipment by the method of paired points has been carried out: the load of the installation for raw materials, the concentration of carbon monoxide in the air of an industrial installation, the temperature of the heat exchange surface.

Statistical Study of the Rotation Effect of Am Stars

1976 ◽  
Vol 32 ◽  
pp. 675-683
Author(s):  
Keiichi Kodaira
Keyword(s):  
Statistical Study ◽  
Rotation Velocity ◽  
General View ◽  
Slow Rotation ◽  
Rotation Effect

SummaryExcess of [m1] index of Am stars, relative to normal stars, is statistically found to be correlated with rotation velocity; the coefficient is estimated at ∆׀m1׀ /∆V(km/sec) ˜ - 0.0007 among Am stars. This result supports the general view that slow rotation is essential for Am phenomena.

Microstructural characterization of laser-melted/roller-quenched dicalcium silicate

1988 ◽  
Vol 46 ◽  
pp. 582-583
Author(s):  
C. J. Chan ◽  
K. R. Venkatachari ◽  
W. M. Kriven ◽  
J. F. Young
Keyword(s):  
Particle Size ◽  
Raw Materials ◽  
Shape Change ◽  
Microstructural Characterization ◽  
Particle Size Effect ◽  
Dicalcium Silicate ◽  
Laser Melting ◽  
Uniform Size ◽  
Cell Shape Change ◽  
Wide Range

Dicalcium silicate (Ca2SiO4) is a major component of Portland cement. It has also been investigated as a potential transformation toughener alternative to zirconia. It has five polymorphs: α, α'H, α'L, β and γ. Of interest is the β-to-γ transformation on cooling at about 490°C. This transformation, accompanied by a 12% volume increase and a 4.6° unit cell shape change, is analogous to the tetragonal-to-monoclinic transformation in zirconia. Due to the processing methods used, previous studies into the particle size effect were limited by a wide range of particle size distribution. In an attempt to obtain a more uniform size, a fast quench rate involving a laser-melting/roller-quenching technique was investigated.The laser-melting/roller-quenching experiment used precompacted bars of stoichiometric γ-Ca2SiO4 powder, which were synthesized from AR grade CaCO3 and SiO2xH2O. The raw materials were mixed by conventional ceramic processing techniques, and sintered at 1450°C. The dusted γ-Ca2SiO4 powder was uniaxially pressed into 0.4 cm x 0.4 cm x 4 cm bars under 34 MPa and cold isostatically pressed under 172 MPa. The γ-Ca2SiO4 bars were melted by a 10 KW-CO2 laser.

Crystallization of barium hexaferrite

1992 ◽  
Vol 50 (1) ◽  
pp. 362-363
Author(s):  
Chung-kook Lee ◽  
Yolande Berta ◽  
Robert F. Speyer
Keyword(s):  
Size Distribution ◽  
Raw Materials ◽  
Barium Hexaferrite ◽  
Recording Media ◽  
Magnetic Recording Media ◽  
Promising Candidate ◽  
Crystallization Method ◽  
Temperature Heat ◽  
High Density Magnetic Recording ◽  
Temperature Heat Treatment

Barium hexaferrite (BaFe12O19) is a promising candidate for high density magnetic recording media due to its superior magnetic properties. For particulate recording media, nano-sized single crystalline powders with a narrow size distribution are a primary application requirement. The glass-crystallization method is preferred because of the controllability of crystallization kinetics, hence, particle size and size distribution. A disadvantage of this method is the need to melt raw materials at high temperatures with non-reactive crucibles, e.g. platinum. However, in this work, we have shown that crystal growth of barium hexaferrite occurred during low temperature heat treatment of raw batches.

Sign in / Sign up

Export Citation Format

Share Document