How to prepare sodium sulfate from sulfuric acid pickling waste liquor? In steel, machinery and other processing industries, a large amount of acid is needed to clean the metal surface. How to treat the pickling waste liquid and prepare sodium sulfate?

一、硫酸酸洗废液特点

1、 Characteristics of sulfuric acid pickling waste liquor

酸洗过程中，酸洗废液酸度强，金属浓度高、废液量大，会对环境造成污染，如果直接排放将对受纳水体及土壤造成严重污染，同时也造成资源浪费。

During the pickling process, the pickling waste liquor has strong acidity, high metal concentration and large amount of waste liquor, which will pollute the environment. If it is discharged directly, it will cause serious pollution to the receiving water and soil, and also cause waste of resources.

二、硫酸钠应用

2、 Application of sodium sulfate

硫酸钠常用于制水玻璃、制浆﹑瓷釉、洗涤剂、致冷混合剂﹑干燥剂、分析化学试剂、染料稀释剂、医药品等等,是一种重要的无机化工原料。

Sodium sulfate is often used in water glass, pulping, enamel, detergent, refrigerant mixture, desiccant, analytical chemical reagent, dye diluent, pharmaceuticals, etc. It is an important inorganic chemical raw material.

三、硫酸酸洗废液制备硫酸钠工艺

3、 Preparation of sodium sulfate from sulfuric acid pickling waste liquor

原料硫酸酸洗废液主要金属成分为亚铁离子、铬离子,经氧化后，设计沉淀剂氢氧化钠浓度、沉淀剂加药速度、搅拌强度对中和沉淀反应效果的影响，取得优化的工艺条件，同时去除酸洗废液中的铁、铬金属离子,制备了符合国家标准的工业无水硫酸钠Ⅱ类产品。

The main metal components of the raw sulfuric acid pickling waste liquor are ferrous ion and chromium ion. After oxidation, the effects of the concentration of sodium hydroxide, the speed of dosing of the precipitator, and the stirring strength on the neutralization and precipitation reaction effect are designed to obtain optimized process conditions. At the same time, the iron and chromium metal ions in the pickling waste liquor are removed, and the industrial anhydrous sodium sulfate class II product meeting the national standard is prepared.

康景辉以硫酸酸洗废液为原料,经氧化耗酸﹑中和沉淀、固液分离、蒸发结晶等工艺过程,制备工业硫酸钠产品。

Kang Jinghui uses sulfuric acid pickling waste liquor as raw material to prepare industrial sodium sulfate products through oxidation and acid consumption, neutralization and precipitation, solid-liquid separation, evaporation and crystallization and other processes.

硫酸酸洗废液因其铁含量低、铬浓度高的特点，不适宜用于制备铁盐混凝剂,因此,本文将酸洗废液经过氧化耗酸﹑中和沉淀处理铁﹑铬金属离子,过滤、蒸发结品等工艺,制备工业无水硫酸钠产品,为硫酸酸洗废液资源化处理提供可行性工艺,并为其实际应用提供依据。

Due to the characteristics of low iron content and high chromium concentration, sulfuric acid pickling waste liquor is not suitable for the preparation of iron salt coagulant. Therefore, this paper will prepare industrial anhydrous sodium sulfate products through the processes of acid consumption, neutralization and precipitation, treatment of iron and chromium metal ions, filtration, evaporation and other processes, providing a feasible process for the resource treatment of sulfuric acid pickling waste liquor, and providing a basis for its practical application.

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