The object of the study is coal sludge and coal fines of the Shubarkol deposit and the Kuznetsk coal basin (Republic of Kazakhstan) for the production of coal-water fuel, which allows replacing liquid and gaseous expensive products. The resulting fuel (after treatment of coal seams and burial) from industrial waste should not harm the environment, which requires certain economic investments. For crushing coal and coal sludge in the crushing and grinding unit, an electrohydroimpulse device for fine grinding of materials was used, consisting of a control unit with a protection system, a pulse capacitor and a high-voltage generator (capacitor bank capacity 0.75 µF, pulse discharge voltage 15–30 kV, length of the interelectrode distance 7–10 mm). After grinding, fine coal particles rise to the surface of the water, and impurities settle at the bottom of the device, which allows enriching the product (flotation). Surface structures and coal fraction sizes were obtained using a Tescan Mira 3 scanning electron microscope. The main characteristics of coal-water fuel during vortex combustion were: the diameter of the fraction 0–250 microns – 63–74 %, process water – 36–24 %, special additive – 1–2 %. Coal-water fuel is similar to liquid fuel, and when transferring heat-generating plants to combustion of suspension, no significant changes in the design of boilers (units) are required. This makes it easy to mechanize and automate the processes of receiving, feeding and burning fuel, and the vortex combustion technology at a temperature of 950–1,050 °C guarantees fuel efficiency of more than 97 %. The given optimal parameters of electrohydroimpulse technology when introduced into production will allow not only grinding, but also enriching the coal product

This article proposes a method for grinding coal based on the use of the energy of a pulsed shock wave resulting from a spark electric discharge in a liquid. The main purpose of the scientific work is the development of an electric pulse device for producing coal powder, the main component of coal-water fuel. The diameter of the initial coal fraction averaged 3 mm, and the size of the resulting product was 250 μm. To achieve this goal, the dependence of the length of a metal rod electrode (positive electrode) on the length and diameter of its insulation is investigated. Various variants of the shape of the base (bottom) of the device acting as a negative electrode are considered, and an effective variant based on the results of coal grinding is proposed. An experimental electric pulse installation is described, the degree of coal grinding is determined depending on the geometric parameters. The optimal characteristics of the obtained coal powder have been established.

The article is concerned with methods of ragging and grinding of copper ore. The proposed electric pulse technology is one of the energetically favorable methods of ragging and grinding of natural minerals and anthropogenic raw materials. This paper presents optimal parameters in processing of the product. The results obtained by grinding of copper ore using the offered technology may be used under industrial conditions in the future.

Numerous studies show that all the requirements for technical diagnostics of the state of heating networks and technological objects are currently satisfied by nondestructive testing methods, which are based on observation and automated registration of processes' temperature. Heat flow meters have a number of advantages compared with other devices that are based on nondestructive testing methods. They are distinguished by high sensitivity to changes in the thermophysical characteristics of controlled objects, the ability to conduct control without using an external energy source, efficiency, compactness, and ease of use. Several modifications of heat flux meters (HFM) based on a thermoelectric battery cell of a special design have been developed. A distinctive feature of HFM design is the presence of a thermoelectric battery converter equipped with a temperature-dependent and heating element whose active junctions are aligned with the receiving plate and whose passive junctions are in thermal contact with the heating element. An experimental model of an underground heat-insulating structure has been assembled to study the influence of the temperatures of the coolant and the environment, the depth of the pipelines, their technical parameters and the parameters of the surrounding soil on the nature of the distribution of the density of thermal radiation from the soil surface over heating networks. Experimental work on the calibration of thermocouples used to determine the temperature change in the soil and the calculation of the calibration coefficient of thermocouples and heat flow meter was carried out. The results of the study of the distribution and temperature change soil are presented. The developed device is designed to analyze the state of thermal insulation of heating networks' underground pipelines.

The work is devoted to the study of the electric pulse disintegration of a natural mineral. The object of the study is the natural mineral quartzite of the Aktas deposit of the Republic of Kazakhstan. For the destruction and grinding of quartzite, a working cell of an electric pulse unit was developed. Electric pulse crushing is a modern technique for grinding a variety of materials, which provides the desired degree of grinding with a certain granulometric composition of the product and has a high ability of selective crushing. With the help of this technology, quartzite grinding was carried out with an increase in the capacity of capacitor banks from 0.25 mF to 1 mF, the pulse discharge voltage changed from 20 kV to 30 kV, the number of pulse discharges from 500 to 1,000, the inner diameter of the working cell from 60 mm to 80 mm. The results of the disintegration of a natural mineral by the electric pulse method allowed us to determine the degree of grinding of the finished product. The obtained results can be used in the study and optimization of the extraction of natural minerals, which is important for ensuring the sustainable use of natural resources and balanced economic development. Crushed quartzite is used in various industries, including the production of optical fibers, electronics and photovoltaic devices. A material with a particle diameter of 0.1 to 0.4 millimeters is used to create glass, ceramic and porcelain products, as well as insulation materials. Due to its homogeneous composition containing up to 98 % silicon oxide (SiO2) and excellent absorbent properties, quartz sand is also used as a filter material for water purification Робота присвячена дослідженню електроімпульсного подрібнення природного мінералу. Об’єктом дослідження є природний мінерал кварцит Актаського родовища Республіки Казахстан. Для руйнування та подрібнення кварциту була розроблена робоча комірка електроімпульсної установки. Електроімпульсне подрібнення – це сучасний метод подрібнення різних матеріалів, що забезпечує задану ступінь подрібнення при певному гранулометричному складі продукту і володіє високою здатністю селективного дроблення. За допомогою даної технології проведено подрібнення кварциту зі збільшенням ємності конденсаторних батарей з 0,25 мкФ до 1 мкФ, зміною напруги імпульсного розряду з 20 кВ до 30 кВ, кількості імпульсних розрядів з 500 до 1000, внутрішнього діаметра робочої комірки з 60 мм до 80 мм. Результати подрібнення природного мінералу електроімпульсним методом дозволили визначити ступінь подрібнення готового продукту. Отримані результати можуть бути використані при дослідженні та оптимізації видобутку природних корисних копалин, що важливо для забезпечення сталого використання природних ресурсів та збалансованого економічного розвитку. Подрібнений кварцит використовується у різних галузях промисловості, включаючи виробництво оптичних волокон, електроніки та фотоелектричних пристроїв. Матеріал з діаметром частинок від 0,1 до 0,4 міліметра використовується для створення виробів зі скла, кераміки та порцеляни, а також ізоляційних матеріалів. Завдяки своєму однорідному складу, що містить до 98 % оксиду кремнію (SiO2) та відмінним абсорбуючим властивостям кварцовий пісок також застосовується в якості фільтруючого матеріалу для очищення води