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Hi,
We normally reduce our loaded electrowinning Steel Wool with Sulphuric acid, then the acid is removed and the remaining materials are washed and dried.
Later the dried materials are mixed with the following flux:
60% Borax, 20 Niter, 5% Soda Ash, 15% Silica. (we tried several other combinations with similar results).
The problem is that the resulting dore bar (after removing the slag), always has a hard black layer attached to the top. This "matte" bar seems fused to the dore, and it is very hard to remove it. The material smells like sulphure and it is soapy if you touch it, but extremely hard. We XRF a chip of the "matte" (the xrf only reads for metals) and it is basically 85% silver 1% gold 11% iron.
I am looking for ideas on how to improve my procedure or flux formula, please.
Thanks in advanced,
J.