Hydrochloric acid is a strong inorganic acid with wide industrial application scenarios. It is commonly used in leaching and impurity removal processes of new energy material recycling, able to dissolve various metal components in waste lithium battery raw materials efficiently. It also plays an important role in pH adjustment, raw material cleaning and auxiliary purification in wet process refining. In laboratory and pilot test work, it is frequently applied to configure test solutions, adjust reaction acidity and complete sample pretreatment, and it is also widely used in wastewater neutralization and sedimentation treatment in factory environmental protection links.