According to the National Intellectual Property Administration, recently, Guangxi Wuzhou Jinhai Stainless Steel Co., Ltd. and Guangxi Hongyi New Materials Co., Ltd. jointly obtained a new patent titled "A Recycling Process for Acid Wash Waste Acid Based on Graded Cooling Crystallization", with the application publication number being CN122502063A and the application date being June 5, 2026.

This is not only a significant achievement of Jinhai's deepening process innovation and insistence on independent technology research, but also an authoritative recognition and high praise from the industry for Jinhai's green production technology and core innovation strength!

This application pertains to the field of acid wash waste liquid recovery technology, specifically involving a recycling process for acid wash waste acid based on graded cooling crystallization. This process includes: conducting solid-liquid filtration and homogenization treatment of acid wash waste acid, detecting the free acid concentration, metal salt concentration, and temperature to determine the amount of supplementary acid and the window for graded cooling crystallization; adding high-concentration sulfuric acid to adjust the acidity to form a crystallizable state; conducting rapid cooling-induced nucleation in the first stage and slow cooling to promote crystal growth in the second stage; determining the crystallization endpoint based on parameters such as turbidity, solid content, etc.; performing centrifugal separation on the crystallization slurry and adjusting the centrifugal parameters based on feedback from feed solid content, filtrate turbidity, and centrifugal load; detecting the quality of the regenerated acid solution and recycling or reprocessing it in stages. This application can achieve the controlled precipitation and efficient separation of metal salts in acid wash waste acid, ensuring the stability of the quality of the regenerated acid solution and increasing the utilization rate of waste acid resources.

Each patent implementation is the fruit of dedicated research, and each technological breakthrough is a witness to perseverance and hard work!

Jinhai Stainless Steel will continue to pursue innovation-driven development, deepen its industrial operations, and focus on innovation. It will empower industrial upgrading through technological innovation and polish the Jinhai brand name with meticulous craftsmanship, contributing Jinhai strength to the green and high-quality development of the industry!