Complex processing of high-carbon ash and slag waste

Abstract

The paper considers a current issue of ash and slag processing for the Polyus Aldan JSC, that has accumulated over 1 million tons of this waste. Following the results of the review of Russian and foreign literature, four promising areas of their use were selected: road construction, building materials, reclamation of disturbed lands, and inert aggregates. To assess the possibility of implementing the selected disposal directions, the samples of ash and slag waste of the enterprise were sampled and analyzed. Fuel characteristics, chemical and mineral composition, as well as physico-chemical and mechanical properties of waste were determined. Taking into account the results of complex laboratory studies and the requirements of regulatory documents, each of the selected areas of using ash and slag waste was evaluated. It was found that their disposal by traditional methods has limitations, mainly related to the high content of unburned fuel residues. The high content of combustible substances and the high specific heat of combustion with a relatively low ash content suggested the possibility of thermal disposal of the studied waste. Based on the literature data, the characteristics of the preparation of organic coal-water suspensions based on the studied ash and slag waste were selected. As a result of a series of experiments on their flaring, the expediency of using the obtained fuel at the enterprise under consideration has been proved. The authors note the possibility of using ash obtained after thermal waste disposal in the road construction industry. The prospects for further research of technologies for the preparation and combustion modes of suspension fuel based on ash and slag waste are determined.

Study the Composition and Environmental Impact of Sewage Sludge

“…The composition of the sludge of treatment plants varies within large limits (Table 1), and determination based on the method of measuring the mass concentrations of heavy metals in samples of excess sludge, provided for the use of a fluorimetric method using a Fluorat -02 liquid analyzer, M01-26-2001, STB ISO 11885-2011 (manufactured by Lumex-Marketing LLC, Russian Federation, St. Petersburg) [Chukaeva et al, 2022].…”

An overview of the environmental impact of coal industry waste

“…However, wastes from coal mining and processing can also be used as a secondary raw material in construction works, such as roadbeds, and in the production of construction materials such as Portland cement, porous aggregates, ceramic wall materials, etc. [18][19][20]. The most probable use of waste coal is in the energy sector as a raw material for fuel blends.…”

Features of engineering geology in different type phosphogypsum piling

“…Изучение отходов различных производств является актуальным научным направлением, в рамках которого сегодня выполняются исследования, ориентированные на модернизацию технологических процессов с целью минимизации объемов отходов [1][2][3], рационального их размещения на земной поверхности [4], снижения техногенной нагрузки [5], возможности использования в качестве вторичного сырья, в том числе для целей рекультивации [6][7][8]. При этом для решения проблемы утилизации отходов минерально-сырьевого комплекса требуется системный подход [9], учитывающий как все многообразие видов отходов [10], так и проблемы длительной устойчивости при их размещении в районах активного горнодобывающего техногенеза [11].…”