The invention relates to the technical field of
industrial waste recycling and
carbon dioxide mineralization, and discloses a leaching method for
calcium ions in
calcium-containing
solid waste. The method for leaching the
calcium ions in the calcium-containing
solid waste comprises the following steps that S1, the calcium-containing
solid waste is subjected to pre-screening and ball milling, and solid waste micro
powder is collected; s2, mixing the solid waste micro
powder with a leaching agent, and reacting to obtain a calcium
ion leaching solution; s3, introducing CO2 gas into the calcium
ion leachate, reacting, and separating to obtain a
calcium carbonate solid and a regenerated leaching agent; in the step S2, the leaching agent comprises protonated organic amine. According to the method for leaching the calcium ions in the calcium-containing solid waste, the leaching agent selectivity is good, the calcium
ion leaching rate is high, the reaction condition is mild,
ammonia escape in the leaching process is little, and environment friendliness is achieved; by introducing CO2 gas into the calcium-containing
leachate, the leaching agent can be quickly regenerated, and the
cyclic stability of the regenerated leaching agent is good.