I been running now for 30min at 1100c.If I’m not mistaken the remperature should be higher, try 1050C
Did you buy ir make the coupel dish.
I purchased the 7A cupels.
Bad batch? Is that possible
I been running now for 30min at 1100c.If I’m not mistaken the remperature should be higher, try 1050C
Did you buy ir make the coupel dish.
There could be iron in it how do I fix this???Just an idea, is there a lot of iron in your cons. Looks like you may have excessive Iron. This happened to me when there was way too much iron in my prill from a smelt and I failed to get the smelt chemistry correct.
I'll buy some scarification dishes next week and try that. Thanks heapsYour sample size seems to be creeping upward. This time it was 3 grams to 30 grams of lead. If anything until you can get a successful cupellation you should using progressively smaller samples not larger.
I think that by using the bits that broke off from the main chunk you may have unintentionally been using slags. I would hammer the cone shaped bar flat and drill a sample from the center after you wire brush off all of the loose bits. To start we want to assure you are starting with a lead/cons sample.
If you do a scorification as per the instructions that lead cone should be hammered free of slag and brushed off to assure most of the slags have been removed before cupellation. My only experience with scorification has been with copper based bullion not lead sulfide (galena) and it has always produced a clear green slag.
Thank youFor a typical bullion fire assay usually 45 minutes. At that point you can see the precious metal balls sitting in the depression without any lead, which has all been absorbed into the cupel.
The temperature should be around 800 - 860 C. max for Au. The black scum on top should start to disappear after a while at around 850 C. I don't know what furnace you are using, but a cupeling furnace is nearly mandatory to get good results. It looks like you are not in the 850 C range for long enough, or too much cold air cooling the cupel. The temperature of the cupel needs to be in the 850 C range, not the temperature of the inside of the furnace. That would need to be higher as Yggdrasil mentioned. Picture of the furnace? Maybe see what Jason uses at Mount Baker Mining. He has a good video on cupeling on youtube. Again, the cupel should not exceed 860 C, or you will start to lose Au/Ag into the cupel. Need to regulate your temperature and minimal air flow into furnace. The bead will flash when it is done.If I’m not mistaken the remperature should be higher, try 1050C
Did you buy ir make the coupel dish.
I'm no cupelling expert I just shared what I have read other places.The temperature should be around 800 - 860 C. max for Au. The black scum on top should start to disappear after a while at around 850 C. I don't know what furnace you are using, but a cupeling furnace is nearly mandatory to get good results. It looks like you are not in the 850 C range for long enough, or too much cold air cooling the cupel. The temperature of the cupel needs to be in the 850 C range, not the temperature of the inside of the furnace. That would need to be higher as Yggdrasil mentioned. Picture of the furnace? Maybe see what Jason uses at Mount Baker Mining. He has a good video on cupeling on youtube. Again, the cupel should not exceed 860 C, or you will start to lose Au/Ag into the cupel. Need to regulate your temperature and minimal air flow into furnace. The bead will flash when it is done.
Ben2363, download this book: "A Textbook of Fire Assaying" by Edward E. Bugbee. Everything you need to know is in there. https://ia800308.us.archive.org/35/items/textbookoffireas00bugbrich/textbookoffireas00bugbrich.pdfSame results. Any idea's what in doing this was 3gram sample with 30grams lead.
So no air flow? Iv had the door partially open because I read somewhere you need more air flowThe temperature should be around 800 - 860 C. max for Au. The black scum on top should start to disappear after a while at around 850 C. I don't know what furnace you are using, but a cupeling furnace is nearly mandatory to get good results. It looks like you are not in the 850 C range for long enough, or too much cold air cooling the cupel. The temperature of the cupel needs to be in the 850 C range, not the temperature of the inside of the furnace. That would need to be higher as Yggdrasil mentioned. Picture of the furnace? Maybe see what Jason uses at Mount Baker Mining. He has a good video on cupeling on youtube. Again, the cupel should not exceed 860 C, or you will start to lose Au/Ag into the cupel. Need to regulate your temperature and minimal air flow into furnace. The bead will flash when it is done.
You need plenty of air, but not so much that it cools the cupel too muchSo no air flow? Iv had the door partially open because I read somewhere you need more air flow
MBMMLLC has perfect videos about pyrometallurgy on youtube. Watch them out, you will visually learn a lot about cupelling and smelting.So no air flow? Iv had the door partially open because I read somewhere you need more air flow
Enter your email address to join: