Would sulfination roasting of an anthracitic black shale (10% organic carbon) at a temperature of 250c release significant amounts of C02? The shale experienced metamorphic temperatures between 250-300c and contains approximately 5% calcium carbonate and 5% sulfide minerals (pyrite).
I am trying to learn if a proposed mining method would release significant amounts of Co2 from a polymetallic black "shale", anthracitic in grade, more like a graphitic shist. My understanding is that the lignite and the carbonate material both need higher temperatures than 250c to release C02 but I do not know what I am talking about. Any help or references are mucho bueno.