Stainless Steel Acid Sludge Recycling in Electric Furnace A Sustainable Solution for Manufacturers

Stainless steel acid sludge is a hazardous waste generated during the pickling process of stainless steel, containing metal elements such as nickel, chromium, iron, as well as harmful substances such as acid solution. The electric furnace for processing and recycling stainless steel acid sludge is a specialized equipment for harmless treatment and valuable metal recovery. The following is a related introduction:

1. Equipment use: Mainly used for the treatment of stainless steel acid sludge, the utilization rate of traditional arc heating method is often less than 80%. Therefore, this equipment adopts a DC+AC method to effectively recover valuable metals.

2. Process method: DC (1500KVA DC melting furnace)+AC electric furnace (2500KVA AC melting furnace). This process is simple, efficient, and is a pre-treatment method for large-scale solid waste reactions.

3. Working principle
Heating and melting: Using the electrodes of an electric furnace to apply current and generate Joule heat, stainless steel acid sludge is melted at high temperatures. Generally speaking, the temperature inside the electric furnace can reach 1500-1700 ℃. Under such high temperature conditions, the organic matter in the acid sludge is decomposed and evaporated, the water is evaporated, and the metal composition undergoes physical and chemical changes, creating conditions for subsequent separation and recovery.
Redox reaction: During the smelting process, an appropriate amount of oxidant or reducing agent is added to the furnace to adjust the redox atmosphere, so that valuable metals in stainless steel acid sludge exist in a specific form for subsequent extraction. For example, the addition of reducing agents can reduce oxides of metals such as nickel and chromium to metallic elements or low valence oxides, while iron may be oxidized to easily separable iron oxides.

4. Performance advantages
Efficient recovery of valuable metals: By precisely controlling the melting temperature and atmosphere, valuable metals such as nickel, chromium, and iron in stainless steel acid sludge can be effectively recovered. The recovery rate of nickel and chromium can reach over 90%, and the recovery rate of iron can also reach a high level, thereby achieving effective utilization of resources and reducing production costs.
Harmless treatment: The high-temperature melting process can completely decompose the organic matter in the acid sludge, eliminating its harm to the environment. At the same time, through the treatment of exhaust gas and wastewater by environmental protection systems, the emission of pollutants can be effectively reduced, and the harmless treatment of stainless steel acid sludge can be achieved, which meets environmental protection requirements.
High degree of automation: Advanced control systems are adopted to achieve automated operations in processes such as feeding, melting, discharging, and temperature control, reducing manual intervention and improving production efficiency and product quality stability. At the same time, the automation system also has fault diagnosis and alarm functions, which facilitate timely detection and handling of problems in the production process.
Strong adaptability: Based on different sources and compositions of stainless steel acid sludge, effective treatment and recovery of various stainless steel acid sludge can be achieved by adjusting smelting process parameters, types and amounts of additives, etc., with strong adaptability and flexibility.