1. The surface of silica powder should not contain impurities such as rockskin stones, weathered stones, sand, etc.; The particle size should be within 80-140mm;
2. Orchid charcoal, with fixed carbon content greater than or equal to 82%, particle size 8-18 mm, moisture content less than or equal to 16%, sieve size less than or equal to 5%, volatile matter content less than or equal to 8%, and ash content less than or equal to 8%;
3. electrode paste, ash content less than or equal to 6%, volatile matter content of 11.2 to 12.5 in summer and 11 to 12.3 in winter. The appearance quality of electrode paste shall be qualified, and the cross section shall be free of impurities or water droplets;
4. pelletised ore, the water content of pelletised ore should be less than or equal to 0.8%, and the iron content should be greater than or equal to 60%. The particle size of pellets should be 8-16mm, and the compressive strength should be greater than or equal to 2500N.
