The invention relates to the technical field of
nickel-containing dangerous and
solid waste recycling, and discloses a complex
nickel-containing waste
smelting flue gas cleaning and comprehensive utilization method which comprises the steps that
smelting flue gas is fed into a dry-method deacidification
tower after being subjected to
waste heat recovery and
shock cooling, coarse-particle
calcium hydroxide is sprayed into the dry-method deacidification
tower, defluorination is preferentially carried out in a first temperature interval of the dry-method deacidification
tower, and defluorination is carried out in a second temperature interval of the dry-method deacidification tower; a defluorination product is collected, and
fluorine-containing dust is separated and collected through electrostatic dust collection; the dedusted
flue gas enters a semi-dry deacidification tower, and fine-particle
calcium hydroxide is sprayed into the semi-dry deacidification tower for deep dechlorination in a lower second temperature interval of the semi-dry deacidification tower; and discharging the purified gas after denitration, washing and
ionic liquid desulfurization. The defluorination product is washed and purified to prepare
hydrofluoric acid, and the dechlorination
slag is dissolved and subjected to a double
decomposition reaction to prepare
hydrochloric acid. According to the method, a
temperature gradient and absorbent particle size gradient
coupling process is utilized, so that directional separation and enrichment of gas-phase
fluorine and
chlorine pollutants are effectively realized, the problem that
carnallite is difficult to utilize is solved, and full-process recycling and ultralow emission are realized.