Work

Carbonation of Alkali-Fused Ash from Biomass Power Plants: A Novel Approach for High Extraction Yield of Nano-Silica

Year: 2026

Type: article

Abstract: This study produces high-purity nano-silica from corn straw ash (biomass power plants) using an alkaline fusion derived sodium silicate solution. CO₂ replaces traditional acids in the carbonation reaction, enabling high extraction yield (93.11%). The process addresses the gap in directly utilizing combustion ash for such high-purity silica. Key optimal conditions identified were: 5 M HCl concentration, NaOH fusion reagent, 1:1.2 mixing ratio, 3 M NaOH solvent, and 12 h ripening. The resulting nano-silica achieved 92.73% purity, 10-50 nm particle size, 270 × 10⁻⁵ m³/kg DBP absorption, 55.9916 m²/g specific surface area, 6.38% LOD, and 6.69% LOI. These properties meet national standards for premium, loosely structured nano-silica. This method provides an economical and effective silicon source, reducing costs and offering economic-environmental benefits.

Source: Processes

DOI: 10.3390/pr14020301

Authors: Jingru Bai, Hang Lei, Meng Xin, Shuo Pan, Qing Wang

Institution: Northeast Electric Power University

Language: English

Topic: Recycling and utilization of industrial and municipal waste in materials production

Subfield: Building and Construction

Field: Engineering

Domain: Physical Sciences

SDGs: Affordable and clean energy, Responsible consumption and production, Climate action

Open Access status: gold

Estimated APC paid: $2,896