The invention discloses a method for comprehensively extracting
arsenic from waste acid and
smoke dust in the
copper smelting industry, and belongs to the field of nonferrous
metallurgy. The method comprises the steps of mixing and leaching the waste acid and the
smoke dust, simultaneously introducing air, and enriching the
arsenic into a leaching solution; adding a vulcanizing agent into the leaching solution to obtain
copper sulfide and a solution after
copper precipitation; introducing
sulfur dioxide or
flue gas after copper
smelting purification into the solution after copper
precipitation, carrying out
arsenic reduction, cooling, crystallizing and separating out
arsenic trioxide, and separating to obtain
arsenic trioxide and the solution after arsenic
precipitation; and enriching other valuable metals in a leaching process of the solution after arsenic precipitation, and further
processing and extracting other valuable
metal elements after enriching to a certain extent. By means of the method, the
combined treatment of copper
smelting waste acid and a
smoke dust source is achieved, the dispersion of arsenic is reduced, the generation of an arsenic-containing
intermediate product is reduced, the direct yield of arsenic is reduced, and the development of arsenic is opened by an
arsenic trioxide product; and the method has the advantages of simple process,
resource utilization, safety, environmental-friendliness and the like.