What happens to a human body at 2000 Kelvin / 1750 Celsius?
Obviously, the body would cremate - but beyond that, what actually happens? I am writing about a fictional serial killer that disposes of his victims bodies in abandoned open-hearth furnaces, but my sources say that a special process is required to get rid of small bone fragments during cremation cause they cannot burn - does this remain true even at extraordinary temperatures, like 2000 Kelvin? If the bone fragments do remain in the industrial canals of these furnaces, how hard is it to recover forensic evidence from these fragments? Would there be anything other than bone, especially depending on how quickly he had to burn these bodies?
Research on this topic is obviously few and far between, cause funnily enough not many people want to think about this kind of thing...