| 摘要 |
PROBLEM TO BE SOLVED: To provide a washing processing method of dust reusably processing the dust containing lead, copper, zinc, cadmium, mercury, selenium, and thallium without concern of polluting the environment.SOLUTION: A washing processing method of dust carries out a mixing step obtaining slurry by mixing dust containing lead, copper, zinc, cadmium, mercury, selenium, and thallium and water, a solid liquid separating step sepatrating the slurry to a liquid component and a solid component, a first sedimentation step separating the liquid component to deposition and supernatant water by adding sulfur compound to the liquid component such that the equivalent ratio of sulfur is more than 1.0 and less than 2.0 to lead, copper, zinc, cadmium, mercury, selenium, and thallium in the liquid component, and a second sedimentation step separating the supernatant water to deposition and supernatant water by adding first iron ion source to the supernatant water obtained in the first sedimentation step. |
