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Chelating agents are widely used in pulp bleaching as stabilizers for hydrogen peroxide； Water treatment agents are used as scale inhibitors in boilers, corrosion inhibitors, and water quality stabilizers in circulating cooling water systems ； Detergent additives ； Used in photosensitive chemicals during the film development process, as well as in the formulations of bleach and fixing solutions ； In the processes of saponification, aging, deliming, tanning, and dyeing in leather processing, it is used to control water hardness and the concentration of heavy metal ions; it helps prevent leather from rotting, improves the efficiency of aging and tanning processes, and prevents the formation of rust spots. In the dyeing process, chelating agents ensure uniform coloring of the leather and are also utilized in the printing and dyeing industry. Chelating agents are divided into inorganic and organic types; inorganic chelating agents undergo hydrolysis at high temperatures, resulting in a decrease or loss of their chelating capacity. Moreover, its chelating capacity is greatly affected by pH value; it is generally suitable only as a chelating agent under alkaline conditions, which limits its applications. It is usually used only for chelating calcium and magnesium ions, and thus is often employed as a water softener. Organic chelating agents include carboxylic acid types and organic polyphosphonic acids, etc. Carboxylic acid-type chelating agents mainly include aminocarboxylic acids and hydroxycarboxylic acids, etc.