The Impurities in Carbide Slag Self-Inducing the Formation of Nano-Rod Caco3 Through Carbonation Reaction

Abstract

Producing polyvinyl chloride (PVC) through calcium carbide route has disposed a mass of by-product carbide slag (CS) which caused serious environmental pollution. Current utilization of CS concentrates on building materials and desulfurizer. However, the high content of Ca(OH) 2 was not well utilized and might generate second pollution. CS shows great potential on mineralization CO 2 to fabricate nano CaCO 3 which consumes solid waste and CO 2 to meet the requirement of cleaner production and high-value utilization of the industry. Nevertheless, the morphology of the carbonation production varies with changing reaction conditions and the impurities which lowers the value of nano CaCO 3 and restricts the application. Here, the impurities in CS and the mechanisms on self-inducing the formation of particular morphology was investigated. Mechanism studies have shown that the presence of Fe 3+ is a key factor in the formation of rod-shaped nano CaCO 3 , and Fe 3+ can induce rod-shaped nano CaCO 3 in the assembly process of granular nano CaCO 3 . The research findings might help the utilization of CS and reduction of CO 2 and the fabrication of high-valued nano CaCO 3 .

Keywords: Carbide slag, CO2, Self-inducing, Carbonation, rod-shaped CaCO3