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高氯锌灰是目前最主要的再生锌原料,该料综合回收价值高,但存在高含氯的问题,使处理能力受到限制。与常规的原料相比,处理工艺复杂、加工成本高。对高氯锌灰物料,可以先通过碱洗脱除90%以上的氯,然后在浸出液中使用萃取脱氯的技术可满足生产电锌中溶液对含氯的要求,确保在电积过程中不影响生产指标,产出品质合格的电锌。萃取脱氯是该工艺的关键技术,萃取脱氯技术不但对氯离子有较高萃取作用,物料通过碱洗、漂洗后,使用废电解液浸出,浸出液中含氯仍达到1.2~2.5g/l,无法满足湿法电积锌溶液质量要求,通过萃取脱氯新技术,控制硫酸锌溶液氯离子小于500mg/L,处理成本低、生产流程稳定。
High-chlorine zinc ash is currently the most important recycled zinc raw materials, the material comprehensive recovery of high value, but there is the problem of high chlorine content, so that processing capacity is limited. Compared with the conventional raw materials, the processing technology is complex and the processing cost is high. For high-chlorine zinc dust materials, alkali can be used to remove more than 90% of the chlorine, and then the technology of extracting dechlorination in the leaching solution can meet the requirement of chlorine content in the solution of zinc electrowinning to ensure that during the electrowinning process Affect the production targets, the output of qualified quality of zinc. Extraction dechlorination is the key technology of the process. The extraction dechlorination technology not only has a higher extraction effect on chloride ion, but also leaches the spent electrolyte after alkali rinsing and rinsing, and the chlorine content in the leaching solution still reaches 1.2-2.5 g / l , Unable to meet the quality requirements of wet electrowinning zinc solution. The new technique of extracting dechlorination controls the chloride ion in the zinc sulphate solution to be less than 500mg / L, the processing cost is low and the production process is stable.