In the modern copper processing industry, continuous casting technology has become the mainstream process with its advantages of high efficiency and energy saving. As the core equipment, the performance of continuous casting copper crucible directly affects the quality of copper materials and production efficiency. This article will focus on the application of graphite crucible in copper continuous casting, analyzing its material properties, structural design and process optimization.
Performance advantages of graphite crucible
Graphite crucible is an ideal choice for copper continuous casting process due to its unique physical and chemical properties:
High thermal conductivity: The thermal conductivity of graphite material is significantly higher than that of traditional refractory materials, which can quickly and evenly transfer heat, shorten the melting time of copper liquid, and improve energy efficiency.
High temperature resistance and thermal shock resistance: Graphite crucible can withstand high temperatures of 1200-1600℃, and has a low thermal expansion coefficient. It can withstand rapid cooling and heating environments and reduce the risk of cracking.
Corrosion resistance and oxidation resistance: After special treatment, the graphite surface has strong resistance to erosion by copper liquid and chemical media, while inhibiting high-temperature oxidation loss and extending service life.
High purity and low pollution: High-purity graphite material avoids impurities from contaminating the copper liquid, ensuring that the purity of the casting rod reaches more than 99.99%, meeting the needs of high-end electronic cables.
Innovative design of crucible for upward continuous casting furnace
Aiming at the problems of high gas content and difficulty in removing impurities in the copper liquid in the traditional process, the new upward continuous casting crucible adopts modular structure optimization:
Three-zone isolation design: The furnace is divided into the feeding zone, the static zone and the guide rod zone through two graphite isolation walls, extending the flow path of the copper liquid, promoting the uniform diffusion of alloy elements and reducing segregation.
Multi-stage filtration system: A graphite filter is set at the bottom of the isolation wall, and the filter at the inlet of the crystallizer is used to double filter the oxides and impurities in the copper liquid to avoid the pore defects of the casting rod.
Flow blocking wall and atmosphere control: A flow blocking wall is set at the bottom of the static zone to increase the contact area between the copper liquid and the graphite wall and enhance the deoxidation effect; at the same time, a sealing cover plate and atmosphere protection technology are used to reduce the oxygen content to below 3ppm.
Process optimization and application effect
Fine smelting control: adopt a step-by-step heating process (300℃ insulation for 12h→500℃ insulation for 8h→800℃ insulation for 10h→1200℃ melting) to ensure that the copper material is fully dissolved and the gas is discharged.
High-efficiency guide rod parameters: the guide rod speed is controlled at 325mm/min, the crystallizer depth is 150-200mm, and 3-5 guide rods are used at a time to achieve stable and continuous production, and the surface finish of the casting rod is improved by 40%.
Environmental protection and economy: The graphite crucible can be reused, and with electric furnace smelting, it saves more than 30% energy compared with traditional oil-fired furnaces, and there is no three wastes pollution, which is in line with the trend of green manufacturing.
Conclusion
The technological innovation of continuous casting copper crucibles has promoted the upgrading of the copper processing industry. Through material modification, structural optimization and process synergy, modern graphite crucibles have shown significant advantages in improving the purity of copper liquid, reducing defects and reducing energy consumption. In the future, with the integration of intelligent control technology, continuous casting equipment will develop in a more efficient and precise direction, helping high-end copper manufacturing to reach new heights.
