With the wide application of cartridge heaters in industrial manufacturing, the number of waste heaters generated every year is increasing. Most of the waste cartridge heaters contain recyclable metal materials and reusable components, and carrying out recycling and remanufacturing can not only reduce resource waste and environmental pollution, but also reduce production costs for enterprises. Promoting the recycling and remanufacturing of waste cartridge heaters is in line with the development trend of green manufacturing and circular economy.
The internal structure of the cartridge heater contains high-value metal resources: the outer sheath is mostly 304/316 stainless steel, Incoloy alloy and other materials; the internal resistance wire is nickel-chromium alloy with high recycling value; the lead wire is copper or tinned copper. These metals can be recycled and reused through professional processing, reducing the demand for primary metal resources and reducing energy consumption and environmental pollution in the mining and smelting process.
Before recycling waste cartridge heaters, classification and sorting should be carried out first. Classify according to the sheath material, alloy type and damage degree of the heater, separate heaters with different materials, and distinguish between seriously damaged and repairable heaters. For heaters with only local damage such as lead wire breakage, insulation layer aging, but intact sheath and resistance wire, remanufacturing and reuse can be carried out; for completely damaged and irreparable heaters, metal recycling is carried out.
The remanufacturing process of waste cartridge heaters mainly includes disassembly, cleaning, component replacement and reassembly. First, disassemble the damaged lead end, remove the aged sealing material and damaged lead wire; clean the internal magnesium oxide insulation layer, remove damp and deteriorated parts, and refill with new high-density magnesium oxide powder; replace the damaged lead wire and sealing components, and re-seal the lead end through high-temperature compression and welding processes. The remanufactured heater undergoes strict performance testing, including insulation resistance, power detection and high-temperature operation test, and can be put into use again after reaching the standard.
Recycling of non-reparable waste heaters requires professional crushing, sorting and smelting. Crush the heater into small pieces, separate metal materials from insulation materials through magnetic separation and gravity separation, and then smelt and purify stainless steel, nickel-chromium alloy and copper materials to produce reusable metal raw materials. In the recycling process, environmental protection measures should be taken to avoid the pollution of dust and waste residues generated in the crushing and smelting process to the environment.
For manufacturing enterprises, participating in the recycling of waste cartridge heaters can obtain certain economic benefits. Sell waste heaters to professional recycling institutions to obtain recycling benefits, and remanufactured heaters can meet their own conventional production needs, reducing procurement costs. At the same time, recycling and reuse help enterprises reduce the amount of solid waste, meet environmental protection requirements, and enhance the social image of green production.
The government and industry should also promote the establishment of a standardized recycling system for cartridge heaters, guide manufacturers to carry out product recycling, and formulate relevant standards for remanufactured heaters to ensure their performance and quality. Through the combination of enterprise independent recycling and professional institution recycling, the resource utilization rate of waste cartridge heaters is improved, realizing the circular utilization of resources and the sustainable development of the industry.
