Cobaltite: Difference between revisions
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| hardness=5.5 | | hardness=5.5 | ||
| density=6.33 | | density=6.33 | ||
| chemf= | | chemf=CoAsS | ||
| calctemp=750 | | calctemp=750 | ||
| calcprod=CoO | | calcprod=CoO | ||
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==Character== | ==Character== | ||
Pure Cobaltite (CoAsS) would be 165.854g/mol, thus 35.5% by mass cobalt, 45% by mass arsenic, and 20% by mass sulfur. | Pure Cobaltite (CoAsS) would be 165.854g/mol, thus 35.5% by mass cobalt, 45% by mass arsenic, and 20% by mass sulfur. | ||
==Roasting== | ==Roasting== | ||
Oxidative roasting below 550°C did not show any crystal structural change in cobaltite but heating to 650°C, yielded Co-As-oxide whose composition varied. Direct oxidation of cobaltite to cobalt oxides with traces of arsenic was observed by roasting at 750°C or above.<ref>{{cite pub | Oxidative roasting below 550°C did not show any crystal structural change in cobaltite but heating to 650°C, yielded Co-As-oxide whose composition varied. Direct oxidation of cobaltite to cobalt oxides with traces of arsenic was observed by roasting at 750°C or above.<ref>{{cite pub | ||
| Line 22: | Line 23: | ||
==Refining== | ==Refining== | ||
Wikipedia writes: | Wikipedia writes: | ||
If purifying by electrolysis, an aqueous sulfate solution at 50 to 70°C is usually used with a lead anode | If purifying by electrolysis, an aqueous sulfate solution at 50 to 70°C is usually used with a lead anode and a stainless steel cathode which will allow for the easy removal of the deposited cobalt. Electro refining in a chloride or sulfate medium at -0.3 V will make a cathode coating of 99.98% Cobalt. | ||
==See Also== | ==See Also== | ||
==References== | ==References== | ||
Latest revision as of 20:23, 2 January 2021
| Frequency | common |
|---|---|
| Hardness | 5.5 |
| Density | 6.33 |
| Chemical Formula | CoAsS |
| Core Elements | Co, As |
| Thermal Decomposition | CoAsS
750°C CoO |
Character
Pure Cobaltite (CoAsS) would be 165.854g/mol, thus 35.5% by mass cobalt, 45% by mass arsenic, and 20% by mass sulfur.
Roasting
Oxidative roasting below 550°C did not show any crystal structural change in cobaltite but heating to 650°C, yielded Co-As-oxide whose composition varied. Direct oxidation of cobaltite to cobalt oxides with traces of arsenic was observed by roasting at 750°C or above.[1]
Refining
Wikipedia writes:
If purifying by electrolysis, an aqueous sulfate solution at 50 to 70°C is usually used with a lead anode and a stainless steel cathode which will allow for the easy removal of the deposited cobalt. Electro refining in a chloride or sulfate medium at -0.3 V will make a cathode coating of 99.98% Cobalt.
See Also
References
- ↑ Wang, Guoxin (1993) "Oxidation of Cobaltite"
University of Nevada, Reno; Master's Thesis