氯酸钠氧化盐酸酸洗废液制备聚氯化铁

钢材在深加工过程中通常使用盐酸对其表面进行酸洗除锈,从而产生大量废液。为了实现盐酸酸洗废液的资源化处理,以氯酸钠作为氧化剂制备聚氯化铁,考察了氧化剂加入量、浓盐酸加入量、反应时间、反应温度等因素对Fe²⁺转化率的影响。实验得到的最佳工艺条件为：每处理100 mL废液需加入7.0 g氯酸钠、12 mL浓盐酸（12 mol/L）、0.3 g磷酸二氢钾,反应温度30 ℃,反应时间30 min,搅拌转速5 r/s。该条件下,Fe²⁺转化率可达98.51%,得到的聚氯化铁产品符合《水处理剂 聚氯化铁》（HG/T 4672—2014）标准。

Preparation of poly ferric chloride from hydrochloric acid picking waste liquid by oxidation with sodium chlorate

Hydrochloric acid is usually used to remove rust from the surface of steel in deep processing,thus producing a large amount of waste liquid. In order to realize the resource treatment of hydrochloric acid pickling waste liquid,poly ferric chloride was prepared using sodium chlorate as the oxidant,and the factors affecting Fe²⁺ conversion rate were investigated,such as oxidant amount,concentrated hydrochloric acid amount,reaction time and reaction temperature. The best process conditions obtained in the experiment are as follows：For every 100 mL of waste liquid,7.0 g of sodium chlorate,12 mL of concentrated hydrochloric acid （12 mol/L）,0.3 g of potassium dihydrogen phosphate,30 ℃ of reaction temperature,30 min of reaction time and 5 r/s of stirring speed are required. Under these conditions,the conversion rate of Fe²⁺ can reach 98.51%,and the obtained polyferric chloride product meets the quality requirement of standard HG/T 4672-2014.