This article presents the results of pilot tests to optimize the manufacturing technology of beater holders for a medium-speed roller mill of the MRM type. MRM mills are widely used in industry for grinding and sorting various materials. The beaters are secured directly to the beater holders on the rotors in hammer mills and crushers. The main goal of the experiment was to increase the efficiency of the technological process for manufacturing beater holders, reduce production time and reduce production costs, without loss of quality and service life. The technological process for producing the holes of the beater holders was changed from mechanical processing to thermal cutting. Thermal cutting provides fast and precise material separation, which is advantageous when working with thick or hard materials. With the development of technology, mechanical cutting has replaced mechanical processing on parts and products that do not require high manufacturing precision. To conduct the experiment, a pilot batch was manufactured and installed at one of the mills of the power plant of EEC JSC in Aksu. The pilot testing program is aimed at studying samples during scheduled repairs, as well as determining the condition of all mechanisms of the MRM mill.

https://doi.org/10.48081/NGLL4420

2024

Issue 1

The article considers the urgent task of forming an optimal route network for the promotion of container trains along the sections of the railway landfill. The purpose of the scientific research is to develop options for solving the problem according to the criterion of minimizing costs. To solve this problem, it is proposed to use a mathematical model of a multi-product flow of minimum cost using the relaxation method, which allows choosing the most effective option for the next solution at each iteration step. The problem of optimizing the routes of container trains is solved by constructing a multigraph with a set of vertices and arcs, the initial data are the unit costs of transporting a unit of production, the maximum and minimum values of flows between vertices. When using graph theory, it is possible to find the optimal distribution of container flows on the network under conditions of maintaining the flow at the vertices of the graph and restrictions on the amount of flow along the arcs. The study found that in order to achieve this task, it is necessary to take into account the unit costs of running container trains between the nodes of the railway polygon, taking into account the carrying capacity of the branches between the nodal stations. In addition to optimizing the routes of container trains, the developed mathematical model allows you to make decisions when choosing a rational investment option for the development of transport infrastructure and increasing the capacity of railway sections of the landfill. The use of the proposed model makes it possible to identify areas with limited bandwidth in order to redistribute flows most effectively. These solutions will allow you to get the maximum possible economic effect by reducing the cost of transportation costs.

https://doi.org/10.48081/LQDF3988

2024

Issue 1

This research work considers the comparison of composite complex alloys as an electrode for hardening of the working body of the seeder – chisel. The task of hardening is to increase the hardness of the material, contributing to the reduction of abrasive wear during the impact of the working body with the soil. According to the results of microstructural analysis of experimental samples were revealed that the initial microstructure with coarse-grained pearlite, surrounded by ferrite after hardening the size of martensitic needles decreases. Measurement of hardness on the Vickers scale allowed to obtain a graphical dependence of hardness on the chemical composition of the alloy, and it was found that the hardness of cladding with electrode T590 with four component alloy Cr25Si2MnB has the highest value of 548÷815HV. Due to the presence of nickel (CS-1) in the composition in compositionally complex alloys, the cost of the hardened part is more expensive, so it was recommended to replace with a four component boron-based alloy (T590).

https://doi.org/10.48081/WSHK2869

2024

Issue 1

The purpose of the work is to confirm the data obtained in the laboratory on the beneficial effect of the introduction of titanium carbide on the properties of antifriction cast iron on industrial samples. The influence of various alloying substances on the hardness and high-strength properties of the specified cast iron during the formation of casting, including the graphite phase in cast iron casting, is given. The results of tests with samples of antifriction cast iron of the AChS-3 grade modified with titanium carbide are presented. For testing, prototypes were obtained at the production site of the limited Liability partnership "Karaganda Machine-Building Plant named after Parkhomenko" as part of industrial tests with a pre-developed technology for producing castings from antifriction cast iron. Microslips prepared for microstructural studies were subjected to tests after purification and treatment with appropriate liquids. The microhardness of the samples, the coefficient of friction, and the composition of the structure of the samples were studied. In the course of the study, to assess the effect of the modifier, the qualitative indicators of samples obtained by a simple method without adding a modifier were compared. Studies show that the structure contains insoluble titanium carbide particles. In the treated samples, the microhardness increases slightly, but the coefficient of friction decreases. This fact confirms the results obtained in previous studies.

https://doi.org/10.48081/XCIP8517

2024

Issue 1

This article notes that during the development of oil and gas fields, the chemical composition of raw materials produced changes due to a violation of the balance between petroleum gas and water, corrosion of minerals and hydrocarbons, which leads to the corrosive destruction of installations. The implementation of the introduction of corrosion-resistant pipes is a top priority. Analysis of failures of corrosion-resistant pipelines in industry reveals violations of various causes. Currently, rust-resistant pipes are successfully produced and used in the company's industries, accounting for a third of the existing pipeline fleet.Specialists overseeing the implementation of corrosion-resistant pipes systematically collect and analyze information about the production, operation and accident rate of pipelines. To prevent these situations, in addition to eliminating design flaws, a significant economic effect has been achieved by reducing the metal consumption of steel pipes. Analyzing the causes of failure of corrosion-resistant pipes, the following conclusions can be drawn. Also, these disadvantages cannot be eliminated from the pipeline design. Here, taking into account alternative options for replacing incomplete assemblies, a concept will be developed within the framework of this article in the case of flexible polymer metal pipes. For all cases of breakdowns and failures of corrosion-resistant pipes, a technical investigation is carried out: study and analysis of technical documentation, inspection of the places of failures, collection and sending of samples for research, laboratory tests, analysis of data on the nature and cause of the breakdown.

https://doi.org/10.48081/LUUM9785

2024

Issue 1

The article is dedicated to the study of changes in the content of aluminum oxide in the Lisakovsk brown iron ore concentrate (LSMC) with the chemical composition of the initial product: Fe - 48.68%; P - 0.70%; SiO2 - 12.03%; Al2O3 - 4.53%, during the thermochemical preparation of the concentrate for metallurgical conversion with the aim of obtaining a concentrate with the necessary SiO2/Al2O3 ratio. In the analysis of the (LSMC) sample, various methods were applied, including thermal, X-ray phase analysis, as well as microscopic examination. The experiments included combined enrichment schemes: dry magnetic separation, roasting, and leaching. Leaching of the roasted products was conducted using a four-factor experimental design with five levels: temperature, °C; time, min; concentration of H2SO4 in %; liquid to solid ratio (L:S) optimal conditions for maximizing the extraction of aluminum oxide during leaching were determined to be: temperature - 25°C, sulfuric acid concentration - 5%, and liquid to solid ratio - 6/1. Under scaled-up laboratory conditions at the established optimal regimes and with a leaching process duration of 30 minutes, a conditioned iron ore concentrate was obtained from the roasted LSMC with the following composition: iron - 64.00%, phosphorus - 0.15%, silica - 4.19%, aluminum oxide - 2.38% with a SiO2/Al2O3 ratio of 1.76.

https://doi.org/10.48081/OEFQ4245

2024

Issue 1

Prior to the introduction of standards limiting emissions of exhaust components, engine control systems using rods, springs, cams and levers were mechanical. The quality of such control did not provide the necessary duplication of control parameters during fuel injection and gorenje. After the introduction of standards limiting emissions of exhaust components, the above-mentioned engine management systems did not meet the requirements. With the development of computer technology and software, it has become possible to replace mechanical control with electronic control systems. It was the development of computer technologies and software that made it possible to develop systems for controlling the parameters of injection and combustion processes in engines with sufficient accuracy and reproducibility of test results. The modern electronic diesel control system (EDC-electronic diesel control), thanks to the increase in the computing power of microprocessors in recent years, makes it possible to meet the high requirements of Common Rail injection systems. The Common Rail system is a highly efficient technology in the field of fuel injection into diesel engines. The article presents issues in the field of four thematic levels: engine design and modernization, its operation, diagnostic issues in order to identify the causes of unit failures and bench methods for evaluating the effectiveness of unit repairs, as well as issues of alternative fuels.

https://doi.org/10.48081/DXSE4260

2024

Issue 1

This article presents the results of scientific research carried out by the authors in the field of transportation technology in industrial transport. The application of a gravity coal intake device designed to lower coal from the upper horizon to the averaging warehouse of the lower horizon of a coal mine is considered. The velocities of the uniform movement of the load along the gravitational angle are determined depending on the angle of inclination. The numerical integration algorithm is implemented in the software environment of the Scilab application program. The results of calculating the speed of movement from the current value of the descent depth, for the required descent depth of 40 meters and for placement options in various sections of the section at the angles of inclination of the acceleration sections of 30, 40 and 45 degrees are presented. The main geometric parameters of the gravitational coal intake device for a coal mine are determined from the condition of limiting the speeds of coal movement. The design of the gravitational coal intake must be performed based on the condition at the beginning of accelerated movement, then movement at a steady speed and then slow motion to the required speed of coal exit from the coal intake at the required speed of 2 m/sec. The presented research results allowed us to determine the main parameters of the gravitational device (coal intake) proposed for use in the cyclic flow scheme of the «Molodezhny» coal mine of «Kazakhmys Corporation» LLP.

https://doi.org/10.48081/TETA7252

2024

Issue 1

This article draws attention to the importance of effective control of the composition and properties of the charge in the production of ferroalloys. The main focus is on carbon reducing agents, which play a key role in this process. The problem of the shortage of special coke in Kazakhstan is considered and solutions are proposed – the using of substandard raw materials for the production of reducing agents. In particular, the possibility of using coal from the Zhalyn deposit in a mixture with coal from the Shubarkol deposit is being considered. Researches of differential thermal analysis (DTA) of coals Shubarkol (100%), Zhalyn (100%), as well as in a mixture in a ratio of 50:50% are presented. The detailed characteristic expressed by endothermic and exothermic peaks allows us to fully study the physico-chemical processes occurring as a result of thermal exposure. The conducted studies show that the obtained special coke in a ratio of 50:50% has good performance for reducing agents used in the electrothermy of ferroalloy production. In conclusion, it is emphasized that the use of coal fines helps to reduce the accumulation of coal “wastes”, which has a positive effect on the environment. This shows the importance of further research in this area to optimize the ferroalloy production process.

https://doi.org/10.48081/LDCU7796

2024

Issue 1

At today's consumption level, tin mineral sources are being intensively depleted, due to widespread use in the electronics industry as solder. Therefore, the return of secondary tin to the production cycle is an extremely urgent issue. The article presents a technique for hydrometallurgical extraction of tin from used electronic devices (electronic waste) with the use of ultrasonic intensification. A thorough review of existing and published tin extraction methods has been conducted. The need for a comprehensive method for extracting metals from electronic waste has been identified. The method should minimize energy consumption and environmental impact. This was followed by the conceptual development of an improved hydrometallurgical method for tin extraction, which was confirmed experimentally. When heated to 85 ° C, without ultrasonic exposure, the degree of tin extraction reached 78.4%, and with ultrasonic exposure, tin extraction reached 91.6%. This fact can be explained by a decrease in the activation energy of the tin leaching process from 43.96 kJ/mol under normal conditions to 41.98 kJ/mol under the action of ultrasound and a shift of the limiting stage of the process from the chemical to the intermediate region. Based on these results, the article proposes to further study the effect of ultrasound on the process of cementation deposition of tin from a productive solution. The next article will be devoted to the process of selective deposition of tin from a productive solution

https://doi.org/10.48081/TPWJ8642

2024

Issue 1