The invention discloses a method for steel
slag wet-type desulphurization of
flue gas. The method includes the following process: steel
slag powder is subjected to
hydrolysis and additional
dissolution treatment; a steel
slag solubilization liquid is obtained, added into a
solid-liquid separator and mixed with steel slag absorption pregnant solution; after separation, the supernatant liquid after passing through a steel slag absorption
liquid storage tank is pumped to an absorption
tower where desulphurization occurs when the supernatant liquid is in contact with
flue gas; or the steel slag solubilization liquid is added into the steel slag absorption
liquid storage tank and mixed with the supernatant liquid, and then the steel slag solubilization liquid is pumped to the absorption
tower where desulphurization occurs when the liquid is in contact with the
flue gas; a steel slag absorption pregnant solution produced at the bottom part of the absorption
tower is subjected to separation in the
solid-liquid separator; precipitum is dehydrated in a hydroextractor, and plaster, a by-product, is obtained; and purified
flue gas emitted from the bottom part or the top part of the absorption tower is discharged into the
atmosphere. Compared with the traditional
lime / limestone-plaster method, the invention has the advantages of ensuring the desulphurization degree of
flue gas can be attained, and effectively preventing the absorption tower from scaling. Moreover, the equipment occupies a small area and is operated at a low cost, so that the
economic benefits of waste utilization are improved.