Pyrrhotite from autoclaves

Figure 9. Pyrrhotites from autoclaves (coal only) Blacksville coal with Ht (O) Blacksville coal with synthesis gas (%) Clean Kentucky coal with H2( 3) Clean Kentucky coal with synthesis gas designated coal with synthesis gas (A)-...

Figure 10. Pyrrhotites from autoclaves (coal plus HtS) Blacksville coal with Ht...

Figure 11. Pyrrhotites from autoclaves (coal plus pyrite) Blacksville coal with Ht (O) designated coal with Ht (A) pyrite from Kentucky 11 coal (PY-KY11) pyrite from Robena mine (Py-R) pyrite from Vesta Shannopin mine (Py-VS).

Figure 12. Pyrrhotites from autoclaves and reactors Clean Kentucky coal in autoclave (Q) Clean Kentucky coal in 400 Ib/d reactor (%) Vesta Shannopin pyrite as an additive (Py-VS).

Presumably the hydrogen entering a reactor or charged into an autoclave could be relatively clean and dry, represented by a point in the lower lefthand comer of the reactor zone (or if accompanied by steam, somewhere on the left side of the square). As the reaction proceeded, the reactor gas would become relatively wet (from the balance of the coal reactions or from water in the coal) and loaded with H2S as the H2 was consumed, and would be represented by points near the upper righthand comer of the reactor zone. The area of the reactor zone would stay the same (6x6 log units) but the position of the reactor zone will shift with temperature since the two equilibrium constants are functions of temperature. Note that at 527°C (Figure 3), the reactor zone is almost entirely in the pyrrhotite FellS12 zone Note that at 427°C (Figure 4) the reactor zone is... 

Coal and Coal with Added Pyrite. In Figure 11 are again presented values for Blacksville coal with additional points representing the pyrrhotites resulting when pyrite has been added to the coal in an autoclave at 400 C and in a miniautoclave at 450°C. The pyrites used are obtained from the Robena Mine, from the Vesta... 

The PLATSOL M treatment of a nickel rich concentrate and a pyrrhotite 3 cleaner concentrate was demonstrated. The PLATSOL autoclave process was combined with precious metal precipitation, copper concentrate enrichment, copper removal, iron/aluminum removal, mixed hydroxide precipitation of nickel and cobalt and finally magnesium removal. The copper concentrate enrichment process proved to be a novel addition to the NorthMet flowsheet. The copper in solution from the autoclave processing was recovered by metathesis on the copper concentrate in the enrichment process. The solvent extraction and electrowinning of copper process applied to precious metal free PLATSOL solutions is no longer required by using this metathesis process route. This development provides maximum operational flexibility for treatment of the NorthMet ore. 

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