电镀镉槽母液净化再生与失效液主盐物料提取

           电镀镉槽母液成分以无氰体系为主（兼顾环保性与实用性），核心组分包括主盐、络合剂、辅助络合剂、导电盐及少量添加剂，各成分含量稳定，为净化再生后直接回用提供基础。具体成分及含量如下：主盐氯化镉（CdCl₂）50~70g/L，是提供镉离子的核心组分，决定镀层沉积效率；主络合剂羟基乙叉二膦酸（HEDP，60%水溶液）180~250mL/L，增强镀液稳定性并细化镀层晶粒；辅助络合剂酒石酸钾钠16~33g/L，辅助配位镉离子，提升镀液分散能力。

导电盐氯化钾（KCl）30g/L，降低镀液电阻、提高导电性能；添加剂聚乙二醇0.01~0.2g/L、光亮剂0.01~0.2g/L，分别改善镀层韧性与光泽度；杂质成分（Fe³⁺、Cu²⁺）≤0.5g/L，含量过高会影响镀层质量，需在净化再生中去除。以上含量为工业生产常规范围，可根据镀件要求微调，其稳定组成是母液净化再生、失效液主盐回收。

 The mother liquor of the cadmium electroplating bath is mainly composed of a cyanide-free system (considering both environmental protection and practicality). The core components include main salt, complexing agent, auxiliary complexing agent, conductive salt and a small amount of additives. The content of each component is stable, providing a basis for direct reuse after purification and regeneration. The specific components and their contents are as follows: main salt cadmium chloride (CdCl₂) 50~70g/L, the core component providing cadmium ions, which determines the coating deposition efficiency; main complexing agent hydroxyethylidene diphosphonic acid (HEDP, 60% aqueous solution) 180~250mL/L, which enhances bath stability and refines coating grains; auxiliary complexing agent potassium sodium tartrate 16~33g/L, which assists in coordinating cadmium ions and improves bath throwing power.

Conductive salt potassium chloride (KCl) 30g/L, which reduces bath resistance and improves electrical conductivity; additives polyethylene glycol 0.01~0.2g/L and brightener 0.01~0.2g/L, which improve coating toughness and gloss respectively; impurity components (Fe³⁺, Cu²⁺) ≤0.5g/L, excessive content will affect coating quality and need to be removed during purification and regeneration. The above contents are the conventional range for industrial production, which can be fine-tuned according to the requirements of the plated parts. Their stable composition is the key premise for the purification and regeneration of the mother liquor and the recovery of the main salt from the waste liquid.