The invention relates to a
processing method of stainless steel cold rolling
pickling wastewater. The
pickling wastewater enters a hexavalent chrome secondary reduction
pool after the actions of micro-
electrolysis and hexavalent chrome preliminary reduction of a
scrap iron filtering
pool; the reduced
wastewater enters a front-segment
precipitation tank after
neutralization and
aeration, heavy
metal sludge is concentrated and dehydrated, and the heavy
metal sludge and
scrap iron after the use of the
scrap iron filtering
pool are recycled and used as stainless steel
smelting raw materials; middle-segment
precipitation is carried out after a primary supernatant acts with a precipitant, and dehydrated and dried
fluoride sludge is recycled and used as a metallurgical
adjuvant material; final-segment
precipitation is carried out after a secondary supernatant continues to act with a flocculating agent to obtain
calcium salt which can be used as a
building material raw material; and after the three segments of precipitation of acidic wastewater, the final third level supernatant reaches a standard and is discharged through
water quality regulation and sand filtering. The invention has the advantages of less investment, low wastewater
processing cost, convenient maintenance and the like, and not only can effectively utilize discarded scrap iron of a stainless steel enterprise, but also can greatly lower the subsequent wastewater
processing cost and the operating load.