Abstract
Gossan ore of sulfide zinc deposit contains abundant zinc, iron, and other metal elements, which is a significant resource with complex components and can be utilized. In this study, a new technology of preparing zinc ferrite from zinc sulfide deposit gossan was proposed. The effects of Al2O3, CaO, and SiO2 in gossan on the formation of zinc ferrite were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and specific surface area and pore size analysis (BET). The results show that the presence of Al2O3 and CaO could hinder the formation of zinc ferrite, while silica had no effect on the formation of zinc ferrite. Under the conditions of the molar ratio of ZnO and Fe2O3 to Al2O3, CaO, and SiO2 of 1:1:1, an activation time of 60 min, and a roasting temperature of 750 °C for 120 min, the products, which had good crystallinity, smooth particle surface, and uniform particle size could be obtained. In addition, compared to the roasted products with Al2O3 and CaO, the specific surface area, pore volume, and pore size of the products with SiO2 were the largest.
Highlights
Gossan is a kind of ore mainly composed of iron oxide, manganese oxide, calcium oxide, silicon oxide, alumina, hydrated oxide, sulfate, alum, and clay, which is often distributed in the upper part of primary sulfide deposits [1,2]
The results showed that zinc ferrite could be prepared by grinding and mixing pure iron oxide and zinc oxide in proportion and roasting at 900 ◦ C for 2–4 h [12]
The existence of calcium oxide had an obvious hindrance on the formation of zinc ferrite, while the change of silicon oxide content could not affect the formation of zinc ferrite
Summary
Gossan is a kind of ore mainly composed of iron oxide, manganese oxide, calcium oxide, silicon oxide, alumina, hydrated oxide, sulfate, alum, and clay, which is often distributed in the upper part of primary sulfide deposits [1,2]. Limonite, and colloids in gossan can absorb some valuable elements such as gold, silver, and copper. Sánchez et al [3] used the conventional cyanidation process to treat the gold silver gossan ore, a gold leaching rate of 75%–80% was obtained, and the silver leaching rate could be increased from 40%–45% to 75% after the sample was pretreated with sulfide solution. Celepo et al [4] explored the pretreatment of alkaline solution before cyanide leaching for gold silver gossan ore. The leaching rate of gold and silver increased from 76% and 23% to 87% and 90%, respectively. Li et al [5] conducted a cyanidation leaching experiment on a gossan gold silver ore from Qinghai Province. The leaching rates of gold and silver in the ore reached 93%
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