Method for controlling zinc in acid-containing wastewater of workpiece hot galvanizing process

The invention discloses a method for controlling zinc in acid-containing wastewater in a workpiece hot galvanizing process, the workpiece hot galvanizing process comprises a degreasing step, an acid pickling step, a presoaking step, a preheating step, a hot galvanizing step and a passivation step, and clamps used in the acid pickling step and the hot galvanizing step in the hot galvanizing process are different. In this way, the way that zinc adhered to the surface of the clamp enters pickling waste liquid during galvanization can be cut off, the zinc content in acid liquid is reduced, and the pickling waste liquid treatment cost is reduced. 本发明公开了一种工件热镀锌工艺含酸废水控锌方法，所述工件热镀锌工艺包括脱脂步骤、酸洗步骤、预浸步骤、预热步骤、热镀步骤和钝化步骤，所述热镀锌工艺中酸洗步骤与热镀锌步骤中使用的夹具不同。通过上述方式，本发明能够截断镀锌时夹具表面粘锌进入酸洗废液的途径，降低酸液中的锌含量，降低酸洗废液处理成本。