中和法在钢帘线酸洗废液处理中的应用研究

Study on the Application of Neutralization Method in the Treatment of Pickling Waste Liquid of Steel Cord

摘要: 以钢帘线酸洗废液为原料，研究中和法对酸洗废液中重金属离子的去除情况。选用NaOH、Ca(OH)₂、CaO三种药剂，通过研究滤液产量、污泥产量、滤液中重金属残余量，考察中和法对废酸重金属去除效果。结果表明：中和法对酸洗废液中残留重金属锌、镍、铅、铬等去除效果较好。其中氢氧化钙处理效果最佳，最佳投药量为23%。此时铁、锌、镍、铅、铬的去除率分别为99%、99%、78%、93%、97%。

Abstract: Taking the steel cord acid washing waste as raw material, we studied the neutralization method to remove the heavy metal ions in pickling waste liquid. The effects of NaOH, Ca(OH)₂ and CaO on the removal of heavy metals from waste acid were studied by filtrate production, sludge yield and the residual amount of heavy metals in the filtrate. The results show that the neutralization method can remove the residual heavy metals Zn, Ni, Pb and Cr effectively. The optimal dosage of calcium hydroxide was 23%. The removal rates of iron, zinc, nickel, lead and chromium were 99%, 99%, 78%, 93% and 97%, respectively.