Acid regeneration

C - Chemistry – Metallurgy – 01 – B

Patent

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Details

C01B 7/03 (2006.01) C01G 23/053 (2006.01) C01G 49/06 (2006.01) C22B 1/24 (2006.01) C23G 1/36 (2006.01)

Patent

CA 2129819

Regenetatian of hydrochloric acid by hydrolysis of iron chloride in aqueous solution employs a Pelletiser (5) after preconcentration of acid solution in a "Pre-Evaporator" (1). Pelletiser (5) controls pellet mixture to between 12 % and 14 % free water by recycling dried solids from Roasaer (3), from Screen (7), or from dust removal Cyclone (9), and waste liquid from Preconcentrator (1). Preconcentrator (1) is contacted with superheated gas from Fluid Bed Roaster (3). Rotary Drier (6) dries pellets with a concurrent hot gas stream and the pellets are screened at (7) with oversize being sent to a Mill (8), undersize recycled to Pelletiser (5), and sized feed delivered to Roaster (3). HCl is produced as gas offtake from Preconcentrator (1) and passes viva demisting Cyclone into adiabatic Absorption Process section (11), where weak acid liquor and water (10) are added as required.

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