FUNDAMENTALS OF THE LUMP CRUSHING THEORY. WORKING PROCESSES OF CRUSHING AND SCREENING EQUIPMENT. LECTURE 8

2021 ◽  
pp. 25-32
Author(s):  
A. I. Nizhegorodov
Keyword(s):  
Technological Process ◽  
Rock Properties ◽  
Road Vehicles ◽  
Roll Crusher ◽  
Screening Equipment ◽  
Hydraulic Classification ◽  
Working Processes

The article presents materials of Lecture 8 in Theory of carrying and lifting, construction and road vehicles and equipment, which describes the following issues: the rock properties, the rock crushing degree, the basics of the lump crushing theory and types of crushing machines. The technological process of crushing with a roll crusher is described; the values of forces acting in roll crushers are calculated.Along with the process of crushing, the article deals with the processes of segregation and concentration, the basic of the screening (fractionation) theory and features of the hydraulic classification of nonmetallic materials.

scholarly journals CERTIFICATION OF VEGETABLE OILS AND QUALITY CONTROL IN THE TECHNOLOGICAL PROCESS OF PRODUCTION

2019 ◽  
Vol 2019 (4) ◽  
pp. 119-126
Author(s):  
CH Bekmurotov ◽  
Keyword(s):  
Quality Control ◽  
Technological Process ◽  
Vegetable Oils ◽  
Raw Materials ◽  
Cottonseed Oil ◽  
Product Classification ◽  
Cotton Seeds ◽  
The Cost

The article reviewed the certification and quality control of the technological process for the production of vegetable oil. There is a procedure for packaging, quality control of products, determination of quality indicators and quality control of finished products. The procedure for using refined cottonseed oil and its varieties, the requirements for placement and storage of vegetable oils, as specified in the regulatory documents, the quality control of vegetable oils and other solutions for cottonseed oil are provided. The gas analyzer shows a solution for measuring the amount of solution by painting the tubes of a mixture of gas and air in oil. Detailed information on the production of vegetable oils, the cost of raw materials, the level of fat content of cotton seeds and the methods used to produce oil from cotton seeds. Methods for certification of vegetable oils, types of quality control, methods of testing and quality determination are presented. It was shown that the procedure for refined production of cottonseed oils and their types, as well as the state of the product classification of products based on the method of producing vegetable oils for consumer purposes, analysis of the sequence of refined oils and refining processes.

Classification of mathematical models of technological design

2021 ◽  
pp. 68-71
Author(s):  
Keyword(s):  
Mathematical Model ◽  
Mathematical Models ◽  
Technological Process ◽  
Process Design ◽  
Geometric Parameters ◽  
Technological Design ◽  
Technological Processes ◽  
Technological Preparation

The use of mathematical models is of great importance for the automation of the design of technological processes. Representation of the geometric parameters of the part in the form of mathematical models allows automating the development of the structure and calculation of the parameters of the technological process, which is important for the complete digitalization of the technological preparation of production. Keywords: technological process, design, mathematical model, digitalization. [email protected]

Types and Classification of "Technical Knowledge" As a First Stage of Structuring Educational Information of Electric Power Disciplines

2021 ◽  
Vol 10 (1) ◽  
pp. 29-33
Author(s):  
M. Rogulina
Keyword(s):  
Electric Power ◽  
Technological Process ◽  
Technical Knowledge ◽  
Respective Group ◽  
Technical Object ◽  
Technical Facility ◽  
Technical Description ◽  
Different Types ◽  
Educational Information

The article presents classification features different types of technical knowledge of the technical object and technological process. Selected elements of the three structures for technical facility and the technological process, which are the basis to facilitate actions by the technical description of the object or of the technological process of the respective group.

scholarly journals Design of a roll crusher for sunflower stems and substantiation of the rational modes of its operation

2021 ◽  
Vol 6 (1 (114)) ◽  
pp. 28-37
Author(s):  
Viktor Sheichenko ◽  
Volodymyr Volskyi ◽  
Rostyslav Kotsiubanskyi ◽  
Viktor Dnes ◽  
Misha Shevchuk ◽  
...  
Keyword(s):  
Quality Indicators ◽  
Technological Process ◽  
Cutting Edge ◽  
Plant Residues ◽  
Causal Relationships ◽  
Additional Load ◽  
Total Level ◽  
Total Percentage ◽  
The Right ◽  
Roll Crusher

This paper reports a study of the technological process of grinding plant residues of sunflower and the causal relationships of factors that form the system of quality indicators. The necessary prerequisites for determining rational modes and parameters of the roll crusher have been devised. A prototype of the roll crusher was designed and fabricated, in which the cutting knives are arranged along the entire width of the grip in a staggered manner, with the possibility to change the angle of inclination to the axis of drum rotation in the range of 5...20°. It was established that in the case of the right-side arrangement of the cutting edge of knives, the highest total level of the percentage of crushed stems in the range of 101‒150 mm with an additional load weighing 800 kg exceeded by 1.58 times the corresponding indicators of the roll with an additional load of 600 kg. The largest overall value of the percentage of crushed stems in the range of 0‒200 mm when additionally loading the roll with 800 kg was 1.13 times higher than the corresponding indicators of the roll with an additional load of 600 kg. In the range of 0‒200 mm, with an additional load on the roll of 600 kg, at the left-side arrangement of the cutting edge of the knives of the roll, higher total percentage of crushed stems was observed compared to the right-side arrangement. At a speed of 7.45 km/h, 13.6 km/h, the cumulative value of the percentage of crushed stems exceeded the corresponding indicators at the right-side arrangement of knives by 1.09 times, at the speed of 18.6 km/h – by 1.04 times, at the speed of 22 km/h – by 1.04 times, respectively. It has been noted that at the left-side arrangement of the cutting edge of the knives of the roll, the percentage of crushed stems in the range of 51‒100 mm, with an additional load of 600 kg, exceeded the corresponding indicators with an additional load of 800 kg. At the speed of 10.08 km/h, it was exceeded by 1.9 times; at the speed of 13.6 km/h – by 1.44 times; at the speed of 18.6 km/h – by 1.96 times; at the speed of 22 km/h – by 1.99 times, respectively

scholarly journals Flotation classification in closed-circuit grinding as a way of reducing sulphide ore overgrinding

2021 ◽  
pp. 85-96
Author(s):  
Iurii Morozov ◽  
◽  
Tatiana Intogarova ◽  
Olga Valieva ◽  
Iuliia Donets ◽  
...  
Keyword(s):  
Mass Fraction ◽  
Froth Flotation ◽  
Closed Circuit ◽  
Laboratory Studies ◽  
Copper Ore ◽  
Cycle Simulation ◽  
Sulphide Ore ◽  
Problem Laboratory ◽  
Hydraulic Classification

Research object and aim. Flotation classification in closed-circuit grinding is a way of improving copper ore flotation indicators by reducing minerals overgrinding. Due to valuable components froth recovery with their uncovering in the process of grinding, loss of copper in flotation tailings with secondary slime are reduced significantly. The research aims to study the possibility to improve the flotation of copper ore based on the use of flotation classification in the closed-circuit grinding. Methodology. In order to solve the problem, laboratory studies on closed-circuit grinding experimental modeling were carried out in a mode with and without flotation classification of hydraulic classification discharge. In each grinding mode, five stages of closed-cycle simulation have been implemented. Flotation classification was carried out in froth flotation modes with froth treatment with and without the tapered chute. According to experimental results, the loss of copper has been determined with slime in hydraulic classification discharge and flotation classification, and flotation classification end-product balance was calculated when operating in the closed-circuit grinding. Summary. The obtained experimental data prove the possibility of improving copper ore flotation by reducing minerals overgrinding in the course of flotation classification in closed-circuit grinding. The technology of flotation classification with froth treatment in tapered chutes make it possible to obtain prime concentrate with 18% copper mass fraction when extracting 37.7% copper into it, and final tailings in flotation classification discharge with 0.13% copper mass fraction under 2% loss.

Microwave Classification of Road Vehicles

1990 ◽  
Author(s):  
G.S. Hobson ◽  
H. Roe ◽  
J.P. Hawley
Keyword(s):  
Road Vehicles

Classification of working processes to facilitate occupational hazard coding on industrial trawlers

2003 ◽  
Vol 44 (4) ◽  
pp. 424-430 ◽  
Author(s):  
Olaf C. Jensen ◽  
S�ren Stage ◽  
Preben Noer ◽  
Linda Kaerlev
Keyword(s):  
Occupational Hazard ◽  
Working Processes

scholarly journals Elimination of unproductive losses of water resources from the irrigation network through the use of modern facing materials

2019 ◽  
pp. 91-94
Author(s):  
Fyarid Kinzhaevich Abdrazakov ◽  
Andrey Alekseevich Rukavishnikov
Keyword(s):  
Comparative Analysis ◽  
Water Resources ◽  
Technological Process ◽  
Irrigation Canals ◽  
Irrigation Network ◽  
Innovative Materials ◽  
Basic Parameters

The article presents the actual problems of irrigation canals. Unproductive losses of water from the irrigation network are justified. The classification of innovative facing materials for covering irrigation canals is presented. A comparative analysis of innovative materials on the basic parameters is carried out. A typical technological process of using a concrete canvas and geosynthetic materials for use on irrigation canals is considered.

scholarly journals Overcoming challenges in the classification of deep geothermal potential

2015 ◽  
Vol 3 (1) ◽  
pp. 19-39 ◽  
Author(s):  
K. Breede ◽  
K. Dzebisashvili ◽  
G. Falcone
Keyword(s):  
Rock Properties ◽  
Geothermal Systems ◽  
Carrier Fluid ◽  
Geothermal Potential ◽  
Formation Type ◽  
Minimum Depth ◽  
Universal Definition ◽  
Definition Of ◽  
Correlated Factors

<p><strong>Abstract.</strong> The geothermal community lacks a universal definition of deep geothermal systems. A minimum depth of 400 m is often assumed, with a further sub-classification into middle-deep geothermal systems for reservoirs found between 400 and 1000 m. Yet, the simplistic use of a depth cut-off is insufficient to uniquely determine the type of resource and its associated potential. Different definitions and criteria have been proposed in the past to frame deep geothermal systems. However, although they have valid assumptions, these frameworks lack systematic integration of correlated factors. To further complicate matters, new definitions such as hot dry rock (HDR), enhanced or engineered geothermal systems (EGSs) or deep heat mining have been introduced over the years. A clear and transparent approach is needed to estimate the potential of deep geothermal systems and be capable of distinguishing between resources of a different nature. In order to overcome the ambiguity associated with some past definitions such as EGS, this paper proposes the return to a more rigorous petrothermal versus hydrothermal classification. This would be superimposed with numerical criteria for the following: depth and temperature; predominance of conduction, convection or advection; formation type; rock properties; heat source type; requirement for formation stimulation and corresponding efficiency; requirement to provide the carrier fluid; well productivity (or injectivity); production (or circulation) flow rate; and heat recharge mode. Using the results from data mining of past and present deep geothermal projects worldwide, a classification of the same, according to the aforementioned criteria is proposed.</p>

Screening Methods for Biocides

1983 ◽  
Vol 15 (10) ◽  
pp. 237-246
Author(s):  
Pavel Dočkal
Keyword(s):  
Heat Exchanger ◽  
Experimental Method ◽  
Technological Process ◽  
Cooling Tower ◽  
Screening Methods ◽  
Respiratory Enzymes ◽  
Cooling Systems ◽  
Low Concentrations ◽  
Dehydrogenases Activity

Assimilation of substrates penetrating into cooling systems with make-up water and from the atmosphere, or possibly from leakages from a technological process is followed by growths on heat exchanger surfaces or cooling tower fills. It is with the reuse of water especially that the need for growth suppression by chlorination and/or biocide application is acute. In the paper, screening methods for biocides based on the measurement of respiratory enzymes (dehydrogenases) activity and the level of the intracellular ATP under static and dynamic conditions, simulated by an indoor channel, are described. The result of the experiments suggest the most suitable biocide that is rapidly effective and also effective at low concentrations. The application of the described experimental method has made it possible to carry out the classification of commercial substances in the form of inhibition curves and efficiency.

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