Tetra Technologies, Inc.

Russell A Fisher

Surendra Kumar Mishra

David J Hanlon

Rosa T Swartwout

Paul Wayland

A method for utilization of zinc byproducts in the manufacture of clear brine fluids comprising the step of mixing zinc feedstock containing metal impurities with a halogenic acid to produce an impure zinc halide solution. The metal impurities are removed from the zinc halide solution in a two-stage process: the first stage comprises the steps of precipitating and filtering out manganese and iron and the second stage comprises the steps of contacting the zinc halide solution with elemental zinc to cement out the remaining metals comprising nickel, lead, cadmium, copper, mercury and cobalt. Preferably, the zinc halide solution is contacted with zinc shot in multiple passes through zinc-filled column systems. The pH is adjusted between each step, if necessary, to maintain the pH in the first stage within a range of from about 3.5 to 4.5 and the alkalinity during the second stage at less than 1.0% zinc oxide.

Method for manufacturing clear brine fluids from impure zinc feedstock

A method of converting sodium bromide brine to ammonium bromide brine and optionally to calcium bromide is disclosed. The method involves introducing ammonia and carbon dioxide into the reactant brine, removing a resulting bicarbonate precipitate, driving off any excess ammonium carbonate, and optionally contacting with lime.

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The Woodlands, TX, United States of America

Russell A Fisher