1. In the dye industry, it can be used as a dispersant for disperse dyes and vat dyes, a diluent for acid dyes, and a pigment dispersant. It can be mixed with dispersants MF and NNO, offering excellent thermal stability, dispersibility, and coloring power. 2. As a water reducer for concrete, it performs better than calcium lignosulfonate and is suitable for projects such as culverts, dams, reservoirs, and highways. 3. It can be used in geology and oilfield drilling to consolidate well walls and as a water shutoff agent in oil extraction. 4. In agriculture, it serves as a dispersant for wettable pesticides and a multivalent chelating agent, preventing the formation of curd in high-hardness water at 600 ppm. 5. In the chemical industry, it is used as an expansion agent for the negative electrode of lead-acid batteries, improving low-temperature performance and discharge rates. In electroplating electrolytes, it ensures uniform plating without "dendritic patterns"; in the leather industry, it acts as a tanning agent, and in boilers, it serves as a descaling agent. 6. In metallurgical mining, it is used for *flotation.