pneumonoultramicroscopicsilicovolcanoconiosis

ok then, it has pneumono ultra microscopic silica volcano

but do you have any idea exactly what kind of disease is this?

I know there is one disease called 'silicosis' which is due to inhalation of silica dust and which will damage our lungs, i think the word you have given here also carries the same meaning, but i don't know why volcano is over there.