不锈钢冷轧酸洗废水的分步处理与资源化回收.pdfVIP

不锈钢冷轧酸洗废水的分步处理与资源化回收 石 磊 陈荣欢 王如意 （宝山钢铁股份有限公司技术中心，上海 201900 ） 1 摘 要 针对不锈钢冷轧酸洗废水的来源和特点，提出了一条污泥源头减量、废水分步处理、重金属污泥和钙盐污 泥分类利用的新工艺。结果表明：废水经分步处理，出水可稳定达标，污泥产量可减少8%以上；Fe ，Cr，Ni 在前 步重金属污泥中的回收率均接近或超过95%，F、S 含量降至3%左右，可参照含铁尘泥予以利用；F 在后步污泥中 的回收率超过90%，Fe 、Ni 、Cr 总量低于0.5%，可参照氟石膏或萤石予以利用；同时，污泥的浸出毒性和形态分 析表明，经分步回收的两类污泥不属危险废物，利用途径更广。 关键词 冷轧酸洗废水 分步处理 重金属污泥 钙盐污泥 Two-stage Treatment Process and Resource Recovery on Stainless Steel Cold-rolled Products Pickling Wastewater Shi Lei Chen Ronghuan Wang Ruyi (R D Center，Baoshan Iron Steel Co., Ltd. ，Shanghai，201900) Abstract Based on characteristics and sources of stainless steel cold-rolled products pickling wastewater, a new process route with advantages of sludge originally reduction, wastewater two-stage treatment, heavy metal-containing sludge and calcium salt sludge separately recovery is proposed. As results are shown, after two-stage process treatment, effluent water can reach emission standards steadily, sludge yield can decrease over 8%; within heavy metal-containing sludge, recovery ratios of Fe,Cr and Ni are all reach or surpass 95%, F and S total content drops to around 3%, therefore the front-part sludge can be used as ferric dust; while among the calcium salt sludge, recovery ratio of F surpass 90%, Fe,Cr and Ni total content falls below 0.5%, therefore the post-part sludge can be used as fluorgypsum or fluorite; meanwhile, analysis results on heavy metals leaching toxicity and morphologic distribution indicate that the two kind of sectionalized sludge are not belong to hazardous wastes, which behave stable and have better utilization values compared with former mixed-slu