Method of extracting and recovering mercury from gases
First Claim
1. A method for extraction and recovery of mercury from gases containing gaseous elementary mercury, which comprises(a) treating the gas containing mercury with an aqueous solution in a closed circuit, the solution containing 0.1-300 mmol/l mercury(II)-ions and at least double that content of ion or ions selected from the group consisting of chlorine, bromine, iodine, cyanide and rhodanide ions with the ability to form soluble complexes with mercury (II)-ions, whereby the mercury in the gas is absorbed in the solution,(b) freeing the solution obtained of the mercury absorbed by leading off at least some of the solution, treating the same with a reducing agent and separating precipitated mercury compounds and(c) after mercury precipitation returning the solution, complex forming ions and mercury (II)-ions to the closed circuit in a quantity sufficient to maintain said concentration in the aqueous solution.
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Abstract
A method of extraction of mercury from gases containing gaseous elementary mercury comprising treating said gases in a closed circuit with an aqueous solution containing 0.1-300 mmol/l mecury(II)-ions and at least double that content of ions with the ability to form soluble complexes with mercury(II)-ions whereafter mercury absorbed in solution is recovered and the solution recirculated.
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12 Claims
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1. A method for extraction and recovery of mercury from gases containing gaseous elementary mercury, which comprises
(a) treating the gas containing mercury with an aqueous solution in a closed circuit, the solution containing 0.1-300 mmol/l mercury(II)-ions and at least double that content of ion or ions selected from the group consisting of chlorine, bromine, iodine, cyanide and rhodanide ions with the ability to form soluble complexes with mercury (II)-ions, whereby the mercury in the gas is absorbed in the solution, (b) freeing the solution obtained of the mercury absorbed by leading off at least some of the solution, treating the same with a reducing agent and separating precipitated mercury compounds and (c) after mercury precipitation returning the solution, complex forming ions and mercury (II)-ions to the closed circuit in a quantity sufficient to maintain said concentration in the aqueous solution.
Specification