Authors: M.O. Pilin, A.V. Tikhomirova, V.V. Tikhonov, T.G. Cherkasova

Title of the article: Isolation of titanium dioxide from coal enrichment waste in the framework of complex processing of man-made raw materials

Year: 2025, Issue: 1, Pages: 61-69

Branch of knowledge: 2.6.8. Technology of rare, scattered and radioactive elements

Index UDK: 546.824-31

DOI: 10.26730/1999-4125-2025-1-61-69

Abstract: The coal industry has remained a key element of the global energy system for centuries, providing more than 35% of global electricity production and remaining the main source of energy for industry in emerging economies. Modern industry is facing growing environmental and resource challenges associated with an increase in the volume of man-made waste. One of the most significant sources of such waste is coal enrichment, a process involving the formation of large amounts of tailings, sludge, and ash and slag materials. The potential of coal enrichment waste as a source of alternative raw materials, the study of which revealed the presence of titanium in the form of oxides, silicates and aluminotitanates. For example, in the ashes of the Kuznetsk basin (Russia), the concentration of TiOh reaches 8-12%, which is comparable to low-grade ores. However, the extraction of titanium is complicated by its dispersed distribution and binding to the alumosilicate matrix. In this paper, the waste of coal enrichment of the Berezovskaya Central Processing Plant is considered. In the waste of this processing plant, the concentration of titanium exceeds the industrially significant values characteristic of coal, and is close to the industrially significant for the ash obtained from it. This high concentration makes the extraction of titanium from these wastes not only promising, but also economically attractive, especially in the context of integrated processing. In fact, we are talking about the transition from the problem of waste disposal to the creation of a new, highly profitable production. As can be seen from Table 2, the content of titanium compounds correlates with the iron content, therefore, theoretically, methods of processing ilmenite ores can be used to extract titanium. It is proposed to extract titanium from percolation leaching waste formed during the complex processing of carbon enrichment waste with the extraction of valuable components. Titanium is represented in the waste in the form of oxide forms. Laboratory studies have been conducted to prove the effectiveness of titanium dioxide extraction technology. The degree of titanium extraction by processing technology, consisting of the stages of sulfatizing roasting, cold leaching, followed by boiling the solution and filtration, reaches 99.5%. The titanium dioxide content in the concentrate is 7.32%. The high content of elements other than titanium indicates the presence of soluble double sulfates of iron, aluminum and potassium in the sediment. This indicates that it is necessary to work out the filtering modes.

Key words: industrial waste man-made raw materials waste recycling complex processing titanium dioxide concentrate

Receiving date: 22.11.2024

Approval date: 22.01.2025

Publication date: 12.03.2025

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