Pyrolysis device for hydrochloric acid recovery of magnesium chloride hydrate in the process of extracting nickel hydroxide from saprolite ore with nickel

摘要

The present invention is a first heating unit for removing moisture contained in magnesium chloride hydrate by contacting magnesium chloride hydrate (MgCl 2 ·12H 2 0) with steam supplied at a temperature of 130 to 145° C. and a pressure of 3 to 10 atm. ; Magnesium chloride hydrate (MgCl 2 ㆍ6H 2 0) provided by evaporation of moisture from the first heating unit is indirectly heated to a temperature of 200 to 220 ° C. a second heating unit provided to the heating unit; Magnesium chloride hydrate (MgCl 2 ㆍ2H 2 0) provided by evaporation of moisture from the second heating unit is indirectly heated at a temperature of 400 to 450 ° C. for 30 to 90 minutes to decompose magnesium oxide, chlorine gas and hydrogen chloride. It is characterized in that it comprises a third heating unit to recover.