Purification of Organosilicon Waste Silicon Powder with Hydrometallurgy

Abstract

Waste silicon powder produced during the production process of organosilicon materials is a major environmental concern that can lead to pollution and resource wastage. As a result, it is crucial to find efficient ways of recovering and utilizing this waste material. In this study, the morphology of waste silicon powder was systematically studied, and an optimized purification method was proposed based on a hydrometallurgical process and phase analysis. The complex composition of waste silicon powder presents a significant challenge during its recycling. However, the results of this study showed that metal-assisted chemical etching (MACE), followed by mixed acid system leaching, is the most effective method for removing impurities from the material. The superior order of different acid systems for removing metallic impurities was HCl < HF < HF + HCl < HF + H2O2 < CuACE. It is worth noting that CuACE treatment has a remarkable ability to remove more than 95% of Fe through hydrometallurgy.

The Direct Alloying of Steel through Silicothermic Self-Reduction of Chromite Ore Utilizing Si-Containing Solid Waste

“…Organosilicon materials are predominantly polymeric structures with Si-O-Si as the main chain, renowned for their exceptional corrosion resistance, oxidation resistance, and high-temperature endurance. Consequently, they find widespread applications in aerospace, electronics, chemical and light industries, solar power generation, automotive and mechanical engineering, construction, agriculture, pharmaceuticals, and healthcare [1][2][3][4][5]. The fundamental raw materials for synthesizing organosilicon materials are organosilicon monomers.…”