ACID WASTE GAS TREATMENT AND RESOURCE UTILIZATION

摘要

An acid waste gas treatment and resource utilization method comprises the following steps: (1) using a sodium hydroxide solution as an absorption liquid, absorbing acid waste gas in a circulated manner, constantly monitoring a saturation level of the absorption liquid based on formed saturated sodium salt solubility, when a saturated sodium salt solution is formed, discharging a part of a spray liquid from a spray tower, and adding a circulating alkaline solution formed in step (3) to the spray tower to continue to perform waste gas spray absorption; (2) adding a full dose of sodium hydroxide to a nearly saturated sodium salt spray liquid obtained in step (1), stirring well, and standing, to form crystals with a decrease of the temperature; and (3) separating the solid and liquid in the mixture obtained in step (2), the solid being sodium salt crystals, and the liquid entering step (1) and being used as the absorption liquid.