I ran four fire assays today in some new ore samples from my claim.
They all had sulfides, one more than the other three, so I roasted each sample for an hour each at 1100f.
I then mixed and fused them with legend mi ONGs high litharge fire assay flux with flour. Recipe below:
69% litharge
23.3% soda ash
3.5% bórax
2.2% silica
2% flour
I fused for 40 minutes after reaching 2000f.
The slag on two of them was unlike any I’ve seen before (granted I’ve only done a couple hundred fire assays) two were an opaque yellow, with bits of orange, with a metallic luster on top. One was dark brown with a metallic luster in top, and was was a fairly normal darkish green. Also all of the lead buttons were small (between 15-16 grams) I know I’ll need to add a bit of flour next time, but not sure what else to change to correct the slag. Or if it needs to be corrected?
On picture of each pour, along with the crucibles, arranged in matching order.
They all had sulfides, one more than the other three, so I roasted each sample for an hour each at 1100f.
I then mixed and fused them with legend mi ONGs high litharge fire assay flux with flour. Recipe below:
69% litharge
23.3% soda ash
3.5% bórax
2.2% silica
2% flour
I fused for 40 minutes after reaching 2000f.
The slag on two of them was unlike any I’ve seen before (granted I’ve only done a couple hundred fire assays) two were an opaque yellow, with bits of orange, with a metallic luster on top. One was dark brown with a metallic luster in top, and was was a fairly normal darkish green. Also all of the lead buttons were small (between 15-16 grams) I know I’ll need to add a bit of flour next time, but not sure what else to change to correct the slag. Or if it needs to be corrected?
On picture of each pour, along with the crucibles, arranged in matching order.