Method for the recovery of group IA salts during the treatment of industrial process waste streams
AssigneeMetals Recycling Technologies Corp.
InventorsAllan S. Myerson, Michael W. Cudahy
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Abstract
A method for the production of Group IA salts during a process for the recycling of industrial waste streams containing Group IA compounds and iron and/or zinc compounds, by heating the waste stream in a reducing atmosphere, treating the exhaust fumes from the heating step with an ammonium chloride leaching solution resulting in a Group IA salt containing precipitate, and recovering the Group IA salts from the precipitate.
Claims18
A method for the production of Group IA salts during a process for the recovery of zinc and/or iron values from a waste stream comprising Group IA compounds, iron compounds and zinc compounds, comprising the steps of:
- a. heating the waste stream at an elevated temperature in a reducing atmosphere resulting in the production of exhaust fumes comprising Group IA compounds and zinc compounds;
- b. treating the exhaust fumes with an ammonium chloride solution at an elevated temperature to form a product solution which comprises dissolved zinc compounds and an undissolved solid which comprises the Group IA salts and iron compounds;
- c. washing the undissolved precipitate with water to form a salt solution which comprises the dissolved Group IA salts and an undissolved solid;
- and
- d. recovering the Group IA salts from the salt solution.
Dependencies are inferred from the claim text.