Cobaltite: Difference between revisions
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JeffEvarts (talk | contribs) (Created page with "{{ Ore | freq=common | hardness=5.5 | density=6.33 | chemf=PbS | calctemp=750 | calcprod=PbO | m1=Co | m2=As | m3= }} ==Character== Pure Cobaltite (CoAsS) would be 16...") |
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| chemf=PbS | | chemf=PbS | ||
| calctemp=750 | | calctemp=750 | ||
| calcprod= | | calcprod=CoO | ||
| m1=Co | | m1=Co | ||
| m2=As | | m2=As | ||
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|first1=Guoxin | |first1=Guoxin | ||
|url=http://hdl.handle.net/11714/1777}}</ref> | |url=http://hdl.handle.net/11714/1777}}</ref> | ||
==Refining== | |||
Wikipedia writes: | |||
If purifying by electrolysis, an aqueous sulfate solution at 50 to 70°C is usually used with a lead anode (corrosion products from which will not contaminate the cobalt oxy-hydroxide (CoOOH) electrolyte solution) 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== | ||
Revision as of 23:33, 1 January 2021
| Frequency | common |
|---|---|
| Hardness | 5.5 |
| Density | 6.33 |
| Chemical Formula | PbS |
| Core Elements | Co, As |
| Thermal Decomposition | PbS
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 (corrosion products from which will not contaminate the cobalt oxy-hydroxide (CoOOH) electrolyte solution) 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