Method of producing zinc bromide

Details Method of producing zinc bromide Method of producing zinc bromide

1999-06-29

2000-09-12

Nguyen, Ngoc-Yen

Chemistry of inorganic compounds

Halogen or compound thereof

Binary compound containing metal

423 50, 423140, 423103, 423109, C01B 904, C01G 904

Patent

active

061174084

ABSTRACT:
A method for producing zinc bromide from zinc hydroxide contaminated with iron and manganese compounds. The method comprises the step of mixing zinc hydroxide feedstock containing metal impurities with a hydrobromic acid comprising elemental bromine in the presence of a reducing agent to produce an impure zinc bromide solution. The metal impurities are removed from the zinc bromide solution in a two-stage process: the first stage comprises the steps of precipitating iron by maintaining the pH within a range of from about 3.6 to 4.15 and filtering out the insoluble iron compounds. The second stage comprises the steps of acidifying the zinc hydroxide solution and adjusting the pH to a range of 3.8 to 4.3 with a alkalinity source from metal oxide, hydroxide or carbonate to precipitate the manganese compounds. The resulting mixture is filtered and concentrated to form a solution comprising zinc bromide essentially free of iron and manganese compounds.

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Dec. 18, 1997, Method of Manufacturing Clear Brine Fluids from Impure Zinc Feedstock, Ser. No. 08/993,914.

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