TREATMENT METHOD FOR DUST

摘要

PROBLEM TO BE SOLVED: To provide a dust treatment method capable of efficiently reducing a concentration of heavy metal in a liquid after solid/liquid separation.

SOLUTION: The dust treatment method includes a step 12 for preparing a slurry by mixing the dust 10 containing the heavy metal and water 11 such that a ratio of dust and water becomes a ratio of 1:2-1:20; a first solid/liquid separation step 16 for solid/liquid-separating the prepared slurry to a first filtrate 13 and a residue 14; a step 18 for precipitating the heavy metal in the form of a hydroxide or a carbonate by adjusting pH of the first filtrate obtained by the first solid/liquid separation to 10-12 and adding a carbonic acid solution 17 to the first filtrate; a standing step 19 for further precipitating the left heavy metal by dissolving it in water by a co-precipitation effect with the carbonate by standing the first filtrate adjusted with pH and added with the carbonic acid solution; and a second solid/liquid separation step 23 for solid/liquid-separating the standing substance in the standing step to a second filtrate 21 and a residue 22.

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