Metal oxides create weaker ionic connections than sulfides. Compared to soft ions like sulfide, metals typically form weak bonds with hard ion oxides. Metal-oxide molecules have a weaker link, making them more reactive and hence more amenable to reduction, which can be used to easily extract metals.
In order to create weaker ionic products in the form of metal oxides and hence reduce highly reactive metal oxides, we must heat metal sulfide ores in excess of air during roasting.
Oxidation of sulfides. The release of trace metals from the mineral phase as a result of sulphide oxidation is the first stage of leaching. Due to the prevailing pH and oxidising circumstances, as well as the comparatively long reaction period, sulphate was the final reaction product in both the laboratory and the field.
Minerals that include sulfur are known as sulfides. These minerals are inorganic substances, which means they were created by geological processes as opposed to biological ones. Ice and quartz are the only two minerals that do not include oxides, which are those that do contain oxide anions or oxygen.
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