1. Control the quality of raw materials;
2. The use of secondary materials is strictly in accordance with a reasonable ratio;
3. Use high-quality refining agents for metal smelting;
4. Use ceramic filter;
5. Vacuum melting and conveying;
6. Use ceramic spoons, crucibles, protective tubes, and discard iron tools;
7. Regularly clean up molds, tools, and working surfaces;
8. Use high-quality release agent and other auxiliary materials;
9.Keep the working environment clean.
