Feasibility Analysis and Research on Producing Silicon Fertilizer from Coal Gangue

Abstract

This paper systematically explores the feasibility of utilizing coal gangue, a byproduct of coal mining and washing, as a resource, particularly for the production of agricultural silicon fertilizer, in response to the severe environmental pressure and resource waste caused by its massive accumulation. The study begins with an in-depth analysis of the pollution caused by open-air storage of coal gangue to soil, water, and air, as well as its potential safety hazards, highlighting the urgency and necessity of efficient resource utilization. The paper meticulously examines the chemical composition, mineral structure, and physical properties of coal gangue, demonstrating its sufficient material basis as a raw material for silicon fertilizer. It points out that stable crystalline silicon can be converted into plant-available silicon through appropriate activation technologies. Furthermore, the research reviews the current status and development trends of comprehensive coal gangue utilization technologies both domestically and internationally, with a focus on the advanced "grading and quality-based separation for full-component utilization" technical approach. This approach enables the precise separation and high-value utilization of coal, sand, stone, and soil components, with the silicon-rich fine powder component being activated to produce high-value-added silicon fertilizer. Finally, a comprehensive evaluation is conducted from four dimensions: technical feasibility, economic benefits, environmental benefits, and social benefits. The findings indicate that the technical route for producing silicon fertilizer from coal gangue is clear and reliable, aligning closely with national strategies for ecological environmental protection and circular economic development. It not only enables large-scale consumption of coal gangue and fundamentally alleviates environmental pressure but also transforms waste into treasure by producing agricultural products with significant soil improvement and crop yield enhancement effects. With broad market prospects, this approach represents a sustainable development path that integrates technical feasibility, economic rationality, and social necessity.