Hydrometalurgy or Hydrometallurgy: How To spell?
The word Hydrometalurgy is misspelled against Hydrometallurgy, a noun meaning "The art or process of assaying or reducing ores by means of liquid reagents."
Hydrometallurgy has double "ll" is mispronounced as "l"Remember double 'LL' in between the strings hydrometa & urgy which should not be misspelled with single 'L'
Wrong Spelling:  hydrometa-l-urgy  Correct Spelling:  hydrometa-ll-urgy 
Check more misspelled words of Hydrometallurgy to spell it correct.