## 1 Introduction
Pyrolysis allows for the processing of raw resins while maintaining their original morphology and obtaining filler particles, fibers, organic components, and liquid fuel, but it can be economically inefficient due to the low amount of extracted products and requires an inert environment, which increases the cost of the process. Inertization reduces the toxicity of ash or neutralizes hazardous substances remaining after the incineration of household waste, but its effectiveness depends on the composition of the waste, the conditions, and technological possibilities, requiring careful planning and implementation. Incineration is a simple process with relatively low energy consumption that generates thermal energy, but it is inefficient for the processing of hard-to-degrade compounds and heavy metals, and it also produces a large amount of solid waste (slag and ash) that is highly toxic to the environment, requiring additional waste treatment by different methods. Plasma technology, with a process temperature of 2000 \({}^{\circ}\)C and beyond, ensures the complete decomposition of hazardous organic and inorganic substances and allows for the processing of both slag and ash, yielding stable materials such as wollastonite glass ceramics and high-quality fibers but with the potential for high energy expenses. Each method has its own specific advantages and disadvantages, depending on the type of waste and the treatment goals, but plasma technology stands out as the most advanced method, being especially suitable for the neutralization of hazardous substances. During plasma processing, the process temperature can reach 2000 \({}^{\circ}\)C and beyond. At such high temperatures, all dangerous compounds of both organic and inorganic origin are completely broken down. In addition, both fly ash and slag vitrification processes can be applied using the same technology simultaneously [2; 3; 4; 5]. Predominant materials in this process can include SiO\({}_{2}\) MgO, Ca(OH)\({}_{2}\), CaCO\({}_{3}\), etc. It has been found that wollastonite glass ceramics can be obtained from recycled glass, fly ash waste (obtained from an incinrator), monoclinic wollastonite (b-CaSiO\({}_{3}\)), gehlenite (Ca\({}_{2}\)Al\({}_{2}\)SiO\({}_{7}\)), etc. Such compounds are stable, so their impact on the environment is imperceptible, and they can be safely stored in landfills or used as a secondary raw material in production. Vitrification using plasma pyrolysis has been found to reduce environmental costs [1; 2; 3; 28; 30; 1; 3; 29; 3]. Fly ash can be made into fiber using plasma technology, which is one of the most advanced ways to recycle fly ash and use it to make new materials. This process takes place under a high-temperature gas environment (2000 \({}^{\circ}\)C and beyond) and also provides high kinetic energy, which causes the conversion of fly ash or slag into fiber [1; 2; 3; 4]. The plasma, which is formed at high temperatures, electric fields, and flow rates, partially melts the volatile particles of the ashes and transforms them into a fine micrometer fiber. Plasma technology ensures high-quality fiber production, which can be used in various industries, such as construction and automotive manufacturing, for the production of insulation materials, etc. However, in the scientific literature, there is almost no data on the use of plasma technologies for fiber production from fly ash and slag processing. The purposes of this study were to process fly ash and slag (formed during the incineration of household waste) using a plasma-based chemical process, to investigate the influence of technological parameters on the properties of the processed waste, and to evaluate the possibility of obtaining fiber during this process.