The invention discloses a dressing-
smelting combined treatment method for
sulfate-containing lead-
zinc smelting slags, and belongs to the field of dressing and
smelting. For solving the environmental problems caused by the difficult mineral dressing and recycling of
lead sulfate and
zinc sulfate containing materials and the stockpiling,
percolation and leaching and the like of
slag charges, the dressing-smelting
combined treatment method for
sulfate-containing lead-
zinc smelting slags comprises the following steps: 1)
drying: carrying out heating and
drying treatment on
slag charges; 2)
roasting: adding a
reducing agent into the dried
slag charges so as to carry out reduction
roasting; 3) after the
roasting is completed, slowly cooling the slag charges, and after the temperature of the slag changes is reduced to below 200 DEG C, carrying out water
quenching on the slag charges so as to obtain water-quenched slags; and 4)
grinding and floatation: after the water-quenched slags are subjected to ore
grinding and grading, taking a material with the particle size of less than 75 mu m and carrying out flotation separation on the material so as to obtain a lead concentrate and a zinc concentrate. According to the invention, the lead content of the obtained lead concentrate is more than 55%, and the
recovery rate is more than 80%, the zinc content of the zinc concentrate is more than 35%, and the
recovery rate is more than 75%; and the method disclosed by the invention has the characteristics of low treatment cost, no heavy
metal pollution, and high lead and
zinc metal recovery rates.