Highly efficient production of hydrotalcite-like compounds from blast furnace slag

Abstract

The resource utilization of blast furnace slag was the research hotspot at home and abroad. This study aimed to obtain hydrotalcite-like compounds from slag using co-precipitation method. The optimum process conditions for the synthesis of hydrotalcite-like compounds were investigated using single-factor in a self-designed laboratory-scale system. Furthermore, the synthesis mechanism of hydrotalcite-like compounds was established. The pH of 11.5, precipitation temperature of 343 K, crystallization temperature of 383 K, and crystallization duration of 6– 10 h were shown to be the optimum process conditions for the synthesis of hydrotalcite-like compounds. The leachate formed a typical crystal layered structure of hydrotalcite-like compounds under optimum process conditions through chemical reactions between compounds and sufficient crystallization. The completion of this work provided a new technological path for the utilization of blast furnace slag, which was more conducive to the energy saving and emission reduction of the iron and steel industry.