Depending on your process, ...

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Depending on your process, lime softening (using hydrated lime) can precipitate calcium carbonate (at pH 10,3) and magnesium precipitation if the pH is in the region of 11,0 to 11,3. So it depends on your process as to what constituents will be in the sludge.  I would like to see if this sludge can be used for soil amelioration. But again this all depends on chemical analysis of the sludge. Farmers are always looking for lime (CaCO3). But I am not sure of the purity requirements. So can any agronomists out there give us some leads?