Design of continuous casting refractory materials production line
Introduction
In modern society, refractory material is widely used in the metallurgical industry, machinery manufacturing, electric power, chemicals and other fields. Refractory materials have the characteristics of high temperature resistance, abrasion resistance, good thermal shock resistance and chemical stability. In the metallurgical production process, material preparation and metal liquid casting process generate a lot of high-temperature steam and smoke dust, which can cause serious pollution to the ecological environment. In order to further reduce the environmental pollution and achieve the purpose of energy conservation, the continuous casting process has become the first choice of metal liquid casting technology in modern steelmaking process.
The continuous casting process flow is generally composed of preheating, degassing, desulfurization and other processes. All the processes need the protection of refractory materials. In order to improve the process performance, reduce environmental pollution, save energy and resources, improve the accuracy of casting speed and temperature control, it is necessary to design a continuous casting refractory materials production line.
Design
1. Raw Materials
Good performance refractory materials need to use high-grade raw material components, good raw material proportioning, precise batching and precise preparation, which are the primary guarantee for the production of qualified refractory products. Commonly used raw materials are unshaped refractories, shaped refractories, monolithic refractories and composites. Generally, unshaped refractory has advantages of simple process, wide range of raw materials, low cost and strong adaptability. In the continuous casting refractory materials production line, the unshaped refractory materials are mainly used.
2. Preheating
To make the refractory materials into a certain temperature and keep them in a constant temperature state is the basic precondition for the production of qualified and repetitive refractory products. The preheating process needs to fill the air-pipe furnace with high-grade unshaped refractory materials, and then add the appropriate amount of combustible materials in the combustion chamber, and then ignite it. Through the automatic preheating system, the raw material temperature can be kept in the range of 900-1300 degrees Celsius, so as to ensure the qualified performance of the produced refractory materials.
3. Degassing
The degassed and desulfurized refractory materials not only have good high temperature performance and thermal stability, but also play a role in preventing secondary pollution of continuous casting molten steel during thermal spraying. The degassing process needs to be carried out in the degassing furnace. Firstly, the raw material temperature should be kept at the specified temperature (900-1200℃), and then nitrogen and hydrogen dioxide should be introduced in the furnace chamber, and the gas-solid reaction should be carried out. Finally, the pouring temperature is controlled, the gas content is measured, and the qualified refractories are poured out of the furnace for further continuous casting process.
4. Desulfurization
Desulfurization is the process of removing sulfur from the refractory materials. In the degassing furnace, the sulfur content in the molten refractory should be determined first, then the raw material should be placed in the furnace, and then the oxidation reaction should be carried out in the furnace. Finally, the oxidation reaction should be terminated, the molten refractory should be poured into the casting mold, and the qualified refractories should be pulled out of the casting mold.
5. Temperature Control
For refractory materials, temperature control is very important, too high or too low temperature will lead to the production of unqualified refractory products and affect the quality of the entire production line. Therefore, complete and reliable temperature control should be provided in the entire refractory production process. Temperature can be accurately measured by infrared thermometers, thermocouples, pyrometers and other instruments. The temperature control signal will be transmitted to the automatic temperature control system, and the temperature of the entire production line will be effectively regulated.
Conclusion
The continuous casting refractory materials production line has the characteristics of energy saving, environmental protection and good product quality. The design of the refractory production line should focus on the design of the refractory production process and the selection of refractory materials, as well as the selection and control of equipment, energy conservation and environmental protection, process control and automation, as well as safety and reliability of the whole process. The design of the continuous casting refractory materials production line should take into full account the various technological factors of refractory production and strictly control them according to the relevant process rules.
In order to ensure the quality of the production process and the qualified rate of refractory materials, it is necessary to have a complete technical system and advanced supporting equipment. The whole process should be operated by experienced technicians and continuously monitored and improved according to the production experience to ensure the continuous casting refractory materials production line runs smoothly and stably.
