摘要:
In a process for removing sulfur dioxide from dilute sulfur dioxide gases, the gases are brought into contact with an aqueous solution of zinc sulfate which absorbs the sulfur dioxide, and the absorption products are then partially or fully removed. The aqueous solution may then be recirculated into contact with additional waste gases to produce a cyclic process.
摘要:
SULFURIC ACID IN CONCENTRATED FORM IS RECOVERED FROM DILUTE, WASTE SULFURIC ACID LIQUORS CONTAINING METAL SULFATES, SUCH AS THOSE RESULTING FROM THE LEACHING OF MINERAL VALUES FROM ORES AND THE LIKE OF FROM THE CLEANING METALS SUCH AS IRON AND STEEL. SEPARATION OF THE SULFATE SALTS IN SUBSTANTIALLY DRY FORM IS EFFECTED BY TOTAL EVAPORATION OF THE WATER AND OF THE SULFURIC ACID; CONDENSATION OF THESE VAPORS IS CONTROLLED SO THAT THE RESULTING ACID IS OF INCREASED CONCENTRATION.