Waste power batteries (such as ternary lithium batteries and lithium iron phosphate batteries) contain various metal resources like lithium, cobalt, and nickel. Efficient extraction of these metals not only enables resource recycling but also avoids environmental pollution. In the treatment process, the selection of oxidants is crucial. As two types of commonly used oxidants, Sodium Persulfate and sodium hypochlorite exhibit significant differences in practical applications. The following is a comparative analysis from three dimensions: metal extraction effect, environmental impact, and system purity maintenance.
Ⅰ. Metal Extraction Effect: Selectivity Determines Recycling Value
In waste battery treatment, achieving precise extraction of specific metals is the core to enhancing recycling value. The oxidizing capacity of sodium hypochlorite is significantly affected by pH value. If not properly controlled, slight fluctuations in pH can lead to co-oxidation of multiple metal ions, resulting in the simultaneous leaching of target metals and impurity metals. This complicates subsequent separation and purification steps, not only increasing costs but also potentially reducing the purity and value of the finally recycled metals.
Sodium Persulfate (especially after activation) has a stronger oxidation potential. Through precise regulation of key conditions such as reaction pH and temperature, the sulfate radicals generated after activation achieve optimal stability. It can not only efficiently oxidize target metals but also reduce the leaching of impurity metals; moreover, it has a higher pH tolerance—fluctuations of ±0.5 do not affect the core effect, making the process operation easier to control. This method can effectively reduce the leaching of non-target metals, creating favorable conditions for subsequent high-purity metal recycling and thereby improving the economy of the entire recycling process.
Ⅱ. Environmental Impact: Environmental Attributes Are Related to Sustainable Development
Environmental protection is a bottom line that must be adhered to in the waste battery treatment process, and the characteristics of oxidant reaction products directly affect the environmental protection level of the treatment link. Sodium hypochlorite may generate chlorine-containing by-products such as chlorine gas and chlorate during the reaction. These substances have high biological toxicity and can cause severe harm to the environment if not properly disposed of. Therefore, complete exhaust gas absorption and wastewater treatment facilities must be equipped, increasing subsequent environmental protection costs.
The main reaction product of Sodium Persulfate is sulfate. Although high-concentration sulfate also needs proper treatment to avoid water salinization, its environmental toxicity and corrosiveness are generally lower than those of chlorine-containing pollutants. The treatment process is relatively simpler, and it has more advantages in terms of comprehensive environmental risks and control costs, better meeting the requirements of green treatment.
Ⅲ. System Purity Maintenance: Impurity Control Ensures Subsequent Processes
In the waste battery treatment system, the introduction of impurities will have an adverse impact on subsequent processes such as metal separation and purification. While introducing active ingredients, sodium hypochlorite also introduces chloride ions (Cl⁻) into the system. Chloride ions easily form complexes or insoluble salts with various metal ions, changing the chemical environment of the solution, significantly increasing the difficulty of subsequent separation and purification, and potentially affecting product purity.
Sodium Persulfate, on the other hand, introduces sulfate ions (SO₄²⁻) into the system. Compared with chloride ions, sulfate generally causes less interference in subsequent separation processes such as precipitation and extraction, and is easier to control and manage. This is conducive to maintaining the stability of the process system and the purity of the final product.
Ⅳ. Fujian ZhanHua Chemical: Laying a Solid Foundation for Sodium Persulfate Application with High-Quality Products
In the practical application of Sodium Persulfate, product quality is a key prerequisite for its effectiveness in fields such as waste battery treatment. Fujian ZhanHua Chemical demonstrates industry-leading strength in this dimension. The company has established a strict quality control system covering the entire production process: in the raw material procurement link, it carefully selects high-purity raw materials to ensure the stability of the initial production foundation; during the production process, it adopts an automated control system to monitor key parameters such as reaction temperature, pressure, and concentration in real time, controlling production errors within a very small range to ensure the consistency of each batch of product performance.
At the same time, Fujian ZhanHua Chemical is equipped with a professional quality testing laboratory and has introduced high-precision testing equipment to conduct comprehensive detection of core parameters (such as purity, impurity content, and stability) of the Sodium Persulfate products leaving the factory. This ensures that product purity always maintains a high industry standard and impurity content is far below the average industry threshold. This ultimate pursuit of quality enables its Sodium Persulfate to more stably exert advantages such as selective metal extraction and low environmental harm in waste battery treatment, avoiding a decline in treatment efficiency or process failures caused by product quality fluctuations.
Comprehensively speaking, in the field of waste battery treatment, Sodium Persulfate shows obvious advantages in metal extraction selectivity, environmental friendliness, and system purity maintenance, which is more in line with the current needs for efficient recycling and green treatment of waste battery resources. With its high-purity and low-impurity Sodium Persulfate products, Fujian ZhanHua Chemical provides a solid guarantee for the wide application of Sodium Persulfate in waste battery treatment and other fields, helping related industries move forward in a green and efficient direction.