The invention belongs to the technical field of soil curing agents, and particularly relates to an anti-freeze-thaw
sludge curing agent and a preparation method and application thereof. The
sludge curing agent comprises the following raw materials in parts by
mass: 40-60 parts of
cement, 10-20 parts of an admixture, 10-20 parts of quicklime, 5-10 parts of
gypsum, 5-8 parts of carboxylated porous resin, 0.5-0.8 part of a
nonionic surfactant and 5-8 parts of
activated carbon, and the carboxylated porous resin is of a three-dimensional
network structure formed by
condensation reaction of phenolated alkali
lignin and dialdehyde. Meanwhile, porous resin microspheres are formed by utilizing a pore-
foaming agent, and then the porous resin microspheres,
chloroacetic acid and alkali are subjected to a reaction to prepare carboxylated porous resin microspheres. According to the non-ionic surface
active agent disclosed by the invention, organic matters which are easy to migrate and free in the
sludge are emulsified into micro-micelles, and the micro-micelles are adsorbed by the
activated carbon, so that the micro-micelles are prevented from wrapping gel particles, hydration is hindered, a communicated pore network is prevented from being formed, and the freeze-thaw resistance of a sludge solidified body is improved. The inner surfaces of pores of carboxylated porous resin contain a large amount of phenolic hydroxyl groups and carboxyl groups, so that the migration activity of heavy
metal ions is reduced.