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Fire assay cupellation process (1 reply and 1 comment)
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Hello, I am Imelda from Indonesia
In my company, i worked as a melting staff. I used fire assay. They gave me example 27,5% gold sample for analyzing. They want me to check if the concentration is right or not. The flow chart :
take .... mg of sample
Make into ball shape using lead
Anneal with T = 1095 C for 40 minutes (Pb absorbed into cupel)
I get the mixture of au and ag and make it into layer shape and cornet
I dissolve the Ag using hno3 to get Au
Anneal it for t = 1 minute T = 1095
I get the final Au
The for determination the concentration i calculated final weight/initial weight
I just want to ask is it the right step?
How to calculated how much Ag and Pb must be added? (i am a new staff, so i just follow the table of added Ag)
How about the process? I mean the temperature and the time for annealing