The invention discloses a hydro-
thermal treatment method for
electroplating sludge, which comprises the following steps of: firstly mixing
electroplating sludge with water so as to form
electroplating sludge fluid; feeding the electroplating sludge fluid into a continuous high-temperature and high-pressure reaction kettle, and after a fixed volume is achieved, stopping feeding; raising the
internal temperature of the kettle so as to carry out hydro-
thermal treatment; after the hydro-
thermal treatment is completed, discharging heavy
metal sludge hydro-thermal residues subjected to reaction, and carrying out filter pressing on the discharged heavy
metal sludge hydro-thermal residues so as to obtain
solid-phase hydro-thermal residues and liquid-phase hydro-
thermal water; carrying out immersion cleaning on the
solid-phase hydro-thermal residues by using a
sulfuric acid and carrying out filter pressing on the
solid-phase hydro-thermal residues so as to obtain acid-washing liquor and hydro-thermal residue precipitates, and
drying and
grinding the hydro-thermal residue precipitates subjected to each acid-washing process; and uniformly mixing the acid-washing liquor and the liquid-phase hydro-
thermal water obtained each time, and then preparing ferrite by using a chemical co-
precipitation method. According to the hydro-thermal treatment method disclosed by the invention, the leaching of
heavy metals can be efficiently realized, and the
heavy metals can be subjected to effective separation and recycling by taking subsequent separation measures. The
moisture content of sludge can be greatly reduced through a plate-and-frame
filter press, so that the volume of the sludge residues is reduced, the heavy
metal dissolution rate of the residues is greatly reduced, and the form is more stable.