Extraction of Mg ion and Fabrication of Mg Compound from Ferro-Nickel Slag

Ferro-Nickel slag is one of the by-products in Ferro-Nickel manufacturing process. The slag is composed of SiO2, MgO, Fe2O3 and others. But the slag has been buried at landfill despite having valuable elements. This study tried to extract Mg ion and fabricate Mg compound from ferro-nickel slag using hydrochloric acid solution. Mg ion was extracted with Si, Fe and other ions in HCl solution. So reprocess was needed for gaining high purity Mg ion. It was thought that Si ion or SiO2 precipitated in HCI solution and removed from solution in filtering process. Fe ion converted into Fe(OH)(3) after reacted with NH4OH and precipitated in HCl solution. After these process, the filtrate was composed of high purity Mg ion. MgCl2 center dot NH4Cl center dot 6H(2)O was obtained through drying of filtrate and this product was changed into MgO by burning process (600 degrees C-30 min). That is, 1st material or solution for manufacturing 2nd product was fabricated using acid dissolution method and other treatments.