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、硫酸酸洗廢液特點

1、 Characteristics of sulfuric acid pickling waste liquor

酸洗過程中，酸洗廢液酸度強，金屬濃度高、廢液量大，會對環境造成污染，如果直接排放將對受納水體及土壤造成嚴重污染，同時也造成資源浪費。

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、硫酸鈉應用

2、 Application of sodium sulfate

硫酸鈉常用于制水玻璃、制漿﹑瓷釉、洗滌劑、致冷混合劑﹑干燥劑、分析化學試劑、染料稀釋劑、醫藥品等等,是一種重要的無機化工原料。

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、硫酸酸洗廢液制備硫酸鈉工藝

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

原料硫酸酸洗廢液主要金屬成分為亞鐵離子、鉻離子,經氧化后，設計沉淀劑氫氧化鈉濃度、沉淀劑加藥速度、攪拌強度對中和沉淀反應效果的影響，取得優化的工藝條件，同時去除酸洗廢液中的鐵、鉻金屬離子,制備了符合國家標準的工業無水硫酸鈉Ⅱ類產品。

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.

康景輝以硫酸酸洗廢液為原料,經氧化耗酸﹑中和沉淀、固液分離、蒸發結晶等工藝過程,制備工業硫酸鈉產品。

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.

硫酸酸洗廢液因其鐵含量低、鉻濃度高的特點，不適宜用于制備鐵鹽混凝劑,因此,本文將酸洗廢液經過氧化耗酸﹑中和沉淀處理鐵﹑鉻金屬離子,過濾、蒸發結品等工藝,制備工業無水硫酸鈉產品,為硫酸酸洗廢液資源化處理提供可行性工藝,并為其實際應用提供依據。

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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