초록 ▼

A method for removing contaminants, such as sulfur dioxide, mercury and hydrochloric acid, out of flue gases is provided, said method including the steps of: treating the flue gases with a reagent, such as sodium carbonate, sodium bicarbonate and ammonium salts or mixtures thereof; selectively disso

A method for removing contaminants, such as sulfur dioxide, mercury and hydrochloric acid, out of flue gases is provided, said method including the steps of: treating the flue gases with a reagent, such as sodium carbonate, sodium bicarbonate and ammonium salts or mixtures thereof; selectively dissolving the sodium phosphates produced thereby in water; separating out the solids remaining in suspension in the solution; and crystallizing the purified sodium sulphate present in the above-mentioned solution. The sodium sulfate can be upgraded in glass working furnaces. The reagent can be obtained by heating an intermediate solution containing sodium bicarbonate; sodium carbonate; ammonium bicarbonate and ammonium carbonate, which was obtained from the Solvay process for manufacturing sodium carbonate.

대표청구항 ▼

[ What is claimed is:] [1.] Method for processing flue gases comprising SOx, said method comprising carrying out the following steps:treating said flue gases with a reagent which comprises sodium carbonate, sodium bicarbonate and ammonium salts, thereby producing solids comprising sodium sulphates,s

[ What is claimed is:] [1.] Method for processing flue gases comprising SOx, said method comprising carrying out the following steps:treating said flue gases with a reagent which comprises sodium carbonate, sodium bicarbonate and ammonium salts, thereby producing solids comprising sodium sulphates,separating out the solids from the flue gases,selectively dissolving the sodium sulphates in water,separating out the solids remaining in suspension in the solution,and crystallizing the purified sodium sulphate present in said solution.