As national strategic metals, cobalt and nickel are widely used in key fields such as new energy batteries, aerospace, and high-end manufacturing. The purity of their smelted products directly determines the performance and safety of end-use materials. In natural mineral resources, cobalt and nickel often coexist with various metal elements such as iron, manganese, and copper. If these impurity elements cannot be effectively removed, they will not only affect the chemical purity and subsequent processing performance of cobalt-nickel products, but also reduce the functional characteristics of the final materials. Traditional purification methods tend to have drawbacks such as poor selectivity, long processes, and low efficiency when dealing with complex cobalt-nickel ore systems, which are no longer able to meet the core requirements of modern smelting processes for high purity, green production, and low cost. Against this backdrop, sodium persulfate has emerged as the preferred reagent for impurity removal in cobalt-nickel smelting, thanks to its excellent selective oxidation performance.

The core advantage of sodium persulfate in cobalt-nickel smelting purification stems from its strong oxidizing property and selectivity. Under suitable process conditions, sodium persulfate can oxidize certain low-valence impurity ions in the solution to high-valence states, which then convert into easily separable precipitates, thus achieving the separation of impurities from main metals.

In the specific processes of cobalt-nickel smelting, sodium persulfate can selectively oxidize impurity elements under controlled conditions, while minimizing changes to the original valence states and solubility of main metal ions, thereby reducing the loss of cobalt and nickel. This selectivity, based on differences in oxidation potential, endows sodium persulfate with favorable technical advantages in cobalt-nickel purification, helping to improve purification efficiency and product purity. As a professional sodium persulfate manufacturer, Fujian Zhanhua Chemical ensures stable product purity through strict production control, laying a reliable material foundation for this selective purification process.

In the hydrometallurgical process of cobalt and nickel, sodium persulfate is commonly used to remove high-impact impurities such as iron and manganese, delivering remarkable treatment results.

Taking iron removal as an example: in acidic leachate, iron mainly exists in the form of Fe²⁺, which is difficult to precipitate completely. After adding sodium persulfate, under appropriate acidity and temperature conditions, Fe²⁺ is oxidized to Fe³⁺. Subsequently, when the pH is adjusted, Fe³⁺ forms Fe(OH)₃ precipitates that are easy to settle and filter, thus realizing efficient separation of iron from cobalt and nickel without introducing other impurity ions.

For manganese impurities: Mn²⁺ in the solution can also be oxidized by sodium persulfate to form MnO₂ precipitates with good filterability, which can be effectively separated from the system. In addition, sodium persulfate can also be used to oxidize trace impurities such as chromium and vanadium that may be present in cobalt-nickel solutions, converting them into high-valence precipitates for removal. These applications demonstrate sodium persulfate’s ability to selectively oxidize and remove impurities in complex systems. Fujian Zhanhua Chemical has an annual supply capacity of 50,000 tons of sodium persulfate, with product purity ≥ 99% and low levels of key impurities (e.g., Fe ≤ 0.001%, Mn ≤ 0.0001%), providing high-quality oxidant support for cobalt-nickel smelting.

The advantages of sodium persulfate in cobalt-nickel smelting purification are first reflected in the stability of its oxidation effect. Under standardized smelting process conditions, sodium persulfate can exert a sustained and stable oxidation effect, unaffected by minor fluctuations in the system, ensuring consistent purity of products after purification and providing stable raw material support for subsequent production processes. Secondly, the use of sodium persulfate can often simplify the purification process. Compared with some traditional purification reagents, sodium persulfate features a simpler reaction process and relatively mild operating conditions, eliminating the need for excessive auxiliary equipment. While improving purification results, it reduces the operational complexity and cost of the production process. In addition, the main decomposition products of sodium persulfate after reaction are sodium sulfate and oxygen, which do not impose additional burdens on the environment, complying with the green development requirements of the modern smelting industry.

With its precision in targeted impurity removal, stability in effect output, simplicity in process application, and environmental friendliness, sodium persulfate has become a key reagent to address the high-purity requirements in cobalt-nickel smelting. Relying on its rigorous quality control system, sufficient supply capacity, and comprehensive safety support services, Fujian Zhanhua Chemical has laid a solid foundation for the large-scale application of sodium persulfate in the cobalt-nickel smelting field, helping smelting enterprises achieve high-purity, green, and low-cost production, and empowering the high-quality development of the strategic metal industry.