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Production of a ferric chloride coagulant by leaching an iron ore tailing

2020; Elsevier BV; Volume: 156; Linguagem: Inglês

10.1016/j.mineng.2020.106511

1872-9444

Vítor Otacílio de Almeida, Ivo Schneider,

Mine drainage and remediation techniques

This work aimed at producing a ferric chloride coagulant from an iron ore tailing. The investigated variables were temperature, hydrochloric acid concentration, and heating time. The results indicated increasing solubilization of iron as a function of HCl concentration and temperature. Leaching carried out with a 10.8 mol L-1 of HCl at a temperature of 80° for 120 min resulted in a 94% recovery of iron present in the iron ore tailing. The leachate presented 11% Fe in its composition and a low concentration of contaminants. This enabled the liquor to be used as a coagulant and the water treatment experiment showed the effectiveness of the reagent. The solid phase remaining from the leaching process is a fine powder reached in silica, with potential use in other industrial segments. The results indicate that the production of coagulants may be considered to extend the productive chain of iron ore extraction and to minimize the amount of tailings to be discharged in tailings dams or dry stacking.