Laboratory Testing & General Mineral Processing Engineering

Laboratory Testing & General Mineral Processing Engineering

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Aquea regea Fire Assay (1 reply)

M
Melih
3 years ago
Melih 3 years ago

First of all,for the processing of gold and tellurium ores,how exactly does the pos-roasting(calsine ores contain % 60- 62 Fe ) process work,what is the way to obtain tellurium. Second,which do you prefer for chemical analysis,aquea regea or fire assay testing for gold-tellurirate ores (VMS mine deposit for in anlyser )?

In the world The company which kind of prefer  to methods for gold analysers?

J
Jorge
3 years ago
Jorge 3 years ago
Like

There are two main gold-telluride minerals, calaverite and sylvanite. Regarding the calaverite, if the ore is heated to around 510 oC, then, the gold and tellurium are separated producing tellurium dioxide and metallic gold. If the temperature is higher than 800 oC, the tellurium dioxide is sublimed.

Gold-Telluride ores are a challenging material to perform the fire assayer. There are several reasons, for instance, the content of gold and silver is lower than expected because the cupellating stage is not efficient. For that reason, is highly recommended to use strong oxidizing conditions. In this way, the tellurium is reported in the lead phase. Other important variable is the sample/flux ratio. In some cases, it will be necessary to determine the appropriate ratio according to the gold-tellurium ore.

Follow the link below to get information on fire assay,

https://www.911metallurgist.com/blog/gold-fire-assay-process#assaying-tellurium-compounds

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