The invention discloses a method for achieving filter liquor circulation, recovering waste lead plaster through a wet process and preparing high-purity red lead and relates to the technical field of waste lead-acid
cell lead plaster wet process
recovery and red
lead preparation. The method comprises the following steps that 1,
organic acid salt,
organic acid and
reducer mixed liquor are utilized for leaching out the waste lead plaster, and after
solid and liquid are separated, lixivium is obtained; 2, a
carbonate solution is added to the lixivium, the reaction pH is regulated, and
solid and liquid separating is carried out to obtain
lead carbonate sediment and filter liquor; and 3,
lead carbonate is roasted in the aerobic
atmosphere, and the high-purity red lead with low
impurity content is prepared. The prepared red lead product is high in purity and low in
impurity content, the content of main impurities Ba and Fe is smaller than 10 mg / kg, the content of Cu, Zn and Al
impurity elements is smaller than 1 mg / kg, the filter liquor can achieve closed circulation of
organic acid radical ligand in a leaching
system, and the use efficiency of a leaching agent is improved remarkably.