Ash and Slag Waste as a Secondary Raw Material

Complex processing of ash and slag from coal-fired thermal power plants attracts a lot of attention. Waste processing will reduce the load on existing storage facilities, to return unburned coal to the boilers of power plants, to obtain a valuable raw material resource for construction, ferrous and non-ferrous metallurgy. At all thermal power plants of Ukraine utilization and storage of ash and slag is carried out by hydraulic method. Therefore, for all processing technologies relevant the dehydration of fine-disperse raw material. The article presents the results of laboratory tests of a new device for dehydration of ash and slag waste. It uses a set of influences on raw material: the overlay of vibration oscillations, the electric field and vacuumizing. By the method of pair linear correlations it is obtained that the dependence of moisture on each of the variable parameters has a weak nonlinear character. The exact and approximate multiple regression equations for the practical assessment of moisture under the combined action of all variable factors are obtained. With the size of the raw material + 0.63 – 0.05 mm, it allows to reduce the moisture from 30 to 9 %.

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FLY ASH AS A RAW MATERIAL FOR PRECAST CONCRETE BLOCK PRODUCTION WHEN SOLVING THE ENVIRONMENTAL PROBLEM OF CHP ASH AND SLAG WASTE DISPOSAL

Proceedings of Irkutsk State Technical University ◽

10.21285/1814-3520-2016-6-122-127 ◽

2016 ◽

Vol 113 (6) ◽

pp. 122-127

Author(s):

Natalia Gerasimova ◽

Keyword(s):

Fly Ash ◽

Waste Disposal ◽

Environmental Problem ◽

Precast Concrete ◽

Concrete Block ◽

Raw Material ◽

Ash And Slag Waste ◽

Slag Waste

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Research of composition and properties of ash and slag waste from the Thermal Power Plant of Trans-Baikal region for decrease of anthropogenic impact on environment

RUDN Journal of Ecology and Life Safety ◽

10.22363/2313-2310-2020-28-2-131-141 ◽

2020 ◽

Vol 28 (2) ◽

pp. 131-141

Author(s):

Pavel P. Pankov ◽

Nataliya A. Konovalova ◽

Dmitry V. Bespolitov

Keyword(s):

Fly Ash ◽

National Economy ◽

Anthropogenic Impact ◽

Natural Radionuclides ◽

Thermal Power ◽

Raw Material ◽

Emission Spectrometry ◽

Scanning Calorimetry ◽

Ash And Slag Waste ◽

Slag Waste

The anthropogenic impact on environment of ash and slag waste of CHP 1 and CHP 2 (Chita) and CHP Priargunsky Industrial Mining and Chemical Union (Krasnokamensk) is considered. These wastes cause irreparable damage to the environment, occupy a significant area, lead to a deterioration of the environmental situation in the surrounding areas. Liquidation of such objects of accumulated harm to the environment is the most important state task in the areas of national economy and environmental protection. Rapid recycling of ash and slag waste is possible in road construction (the main material-intensive sector of the national economy) due to large-capacity direct use. This will effectively reduce the anthropogenic impact on the environment and significantly reduce the use of mineral raw. The principal possibility of using of fly ash as a secondary mineral raw material in compositions of road soil concrete is substantiated. The methods of atomic emission spectrometry with inductively coupled plasma, differential scanning calorimetry and thermogravimetry were used to study the composition and properties of fly ash of CHP, which is a first-class mineral raw based on the specific effective activity of natural radionuclides (226Ra, 232Th, 40K), which allows their use in the construction industry without restrictions. It has been established that fly ash is non-porous, its hydraulic properties are classified as latent-active and can be added to road cement soils modified with additives of different nature.

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USE OF TECHOGENIC RAW MATERIALS IN THE TECHNOLOGY OF CERAMIC BRICKS PRODUCTION

Innovatics and Expert Examination ◽

10.35264/1996-2274-2020-2-160-169 ◽

2020 ◽

pp. 160-169

Author(s):

N.I. Buravchuk ◽

O.V. Guryanova

Keyword(s):

Negative Impact ◽

Raw Materials ◽

Raw Material ◽

Laboratory Research ◽

Regulatory Documents ◽

Mine Dumps ◽

Ash And Slag Waste ◽

Technogenic Raw Materials ◽

The Cost ◽

Slag Waste

The article presents the results of a study of burnt rocks of mine dumps, ash and slag waste and clay raw materials for the purpose of their use in the technology of manufacturing ceramic bricks. Indicators of their quality are given. In terms of properties and composition, this raw material is close to clay. Compositions and technological modes for the manufacture of ceramic bricks using burnt rocks of mine dumps and ash and slag waste have been developed. The results of laboratory research and industrial tests are presented. The possibility of using this technogenic raw material in the technology of manufacturing ceramic bricks has been proven. The use of burnt rocks and ash and slag waste in the compositions for the manufacture of ceramic bricks can improve its quality, including strength and frost resistance. In all respects, prototypes of ceramic bricks meet the requirements of regulatory documents. The involvement of technogenic raw materials in production allows you to save part of natural raw materials, reduce the cost of products while improving their quality, and help reduce the negative impact of waste on the environment in the areas of their location.The involvement of technogenic raw materials in production allows you to save part of natural raw materials, reduce the cost of products while improving their quality, and help reduce the negative impact of waste on the environment in the areas where they are located.

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RESULTS OF RESEARCHES OF DEHYDRATION OF SMALL DISPERSED ROCK MASS ON A VIBRATING DEVICE OF NEW DESIGN

Vibrations in engineering and technology ◽

10.37128/2306-8744-2020-4-1 ◽

2020 ◽

pp. 5-10

Author(s):

Vladimir Naduty ◽

Vitaliy Sukharev ◽

Sergey Kostyrya

Keyword(s):

Rock Mass ◽

Raw Materials ◽

Froth Flotation ◽

Mining Industry ◽

Raw Material ◽

Auxiliary Process ◽

Amplitude Fluctuations ◽

Ash And Slag Waste ◽

Mechanical Methods ◽

Slag Waste

Great difficulties arise when processing wet mineral raw materials less than 1 mm, and this problem is given large attention. There is an urgent need to dehydrate the final product of mining to a minimum percentage of moisture. Such raw material includes coal, which in the process of mining and processing forms a large number of small particles with a size of 1.0 ÷ 0.05 mm and, when enriched by froth flotation, is saturated with moisture, which complicates the subsequent use of coal. Also, for the processing of man-made deposits, consisting of ash and slag waste, they must be dewatered for subsequent complex processing, which consists in the use of magnetic separation and fine screening. Mechanical dewatering devices do not always provide the final moisture content required by the market today. Only free and loosely bound moisture is extracted by mechanical methods, and pore and capillary moisture is not removed. Therefore, various sources of heat are used as an auxiliary process for the dehydration of minerals. The article presents the results of studies of dehydration of finely dispersed rock mass on a vibration device of a new design. Intensification of the dewatering process is achieved due to the vertical conical screw and the creation of a vibroboiling layer. Preliminary studies have shown the effectiveness of the use of a transport-drying device, while it was possible to reduce the humidity in the finished product from 15% to 5%. According to the results of the experiments, it was found that during the operation of the transport-drying device, the layer thickness decreases from loading to unloading by 3 times, while the path of movement of the material along the working surface increases 2.5 times, the frequency range of vibration excitation from 1000-1200 rpm, the amplitude fluctuations are 4-5 mm and the temperature of the supplied air is 50-80 Сº. Thus, the proposed dewatering device can be used in the mining industry, since, in addition to transportation, it is also capable of dewatering wet material with sufficient efficiency.

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