Technology for obtaining multicomponent flame retardants from Kyzylkum phosphorites and technogenic waste
Year: 2026
Type: conference-paper
Abstract: This study presents a resource-efficient technology for producing multicomponent flame-retardant compositions from low-grade Kyzylkum phosphorites and waste nitrous gases generated by nitric acid production. A blended phosphorite sample containing dust fraction, two phosphorite-flour fractions, and mineralized mass was processed in two consecutive stages by bubbling industrial nitrous gases through an aqueous suspension. During the first stage, the pH decreased from 9.10 to 3.20, and the phosphorite solubility reached 37.6%. The resulting liquid phase contained phosphorus-, silicon-, aluminum-, iron-, and nitrogen-containing components, but its flame-retardant efficiency was limited by their relatively low total concentration. In the second stage, the first-stage liquid phase was reused as the reaction medium to process a fresh portion of phosphorite. This increased overall phosphorite solubility to 43.98% and raised the total concentration of active flame-retardant components from 14.45% to 23.89%. After neutralization with ammonia solution, the second-stage liquid product was applied to paper, cotton fabric, cardboard, corrugated cardboard, and pine wood. The treated samples showed flame-retardant efficiencies of 81.08-84.21%, and combustion ceased after flame removal. The proposed method enables simultaneous utilization of low-grade phosphate raw materials and industrial nitrous-gas emissions while producing effective phosphorus–nitrogen-containing fire-retardant compositions.
Source: E3S Web of Conferences
Language: English
Subfield: Polymers and Plastics
Field: Materials Science
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W7203475985