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Tin concentrate is classified into two categories based on its properties: one is oxide-type tin concentrate that can be directly smelted in a furnace ; the other is sulfide-type tin concentrate that requires processing before smelting . Tin concentrate is also classified into first-grade, second-grade, and third-grade tin concentrates based on its chemical composition. Grade 1, Grade 4, Grade 5, Grade 6, and Grade 7. The quality standards for tin concentrate are shown in Table 5-15.
Table 5-15 Tin concentrate quality standards unit :%
| category | Taste class | chemical composition | |||||||
| Sn≥ | Impurities ≤ | ||||||||
| S | As | Bi | Zn | Sb | Fe | F | |||
| A type | Grade A | 70 | 0.30 | 0.20 | 0.08 | 0.30 | 0.20 | 3.00 | 0.20 |
| Grade II | 65 | 0.40 | 0.30 | 0.10 | 0.40 | 0.20 | 5.00 | 0.20 | |
| Grade III | 60 | 0.50 | 0.40 | 0.10 | 0.50 | 0.30 | 7.00 | 0.20 | |
| Grade IV | 55 | 0.60 | 0.50 | 0.15 | 0.60 | 0.40 | 9.00 | 0.20 | |
| Grade 5 | 50 | 0.80 | 0.60 | 0.15 | 0.70 | 0.40 | 12.00 | 0.20 | |
| Grade 6 | 45 | 1.00 | 0.70 | 0.20 | 0.80 | 0.50 | 15.00 | 0.20 | |
| Grade 7 | 40 | 1.20 | 0.80 | 0.20 | 0.90 | 0.60 | 16.00 | 0.20 | |
| Category II | Grade A | 70 | 0.70 | 0.30 | 0.30 | 0.50 | 0.30 | 3.00 | 0.20 |
| Grade II | 65 | 1.00 | 0.40 | 0.40 | 0.80 | 0.40 | 5.00 | 0.20 | |
| Grade III | 60 | 1.50 | 0.50 | 0.50 | 0.90 | 0.50 | 7.00 | 0.20 | |
| Grade IV | 55 | 2.00 | 1.00 | 0.60 | 1.00 | 0.60 | 9.00 | 0.20 | |
| Grade 5 | 50 | 2.50 | 1.50 | 0.80 | 1.20 | 0.70 | 12.00 | 0.20 | |
| Grade 6 | 45 | 3.00 | 2.00 | 1.00 | 1.40 | 0.80 | 15.00 | 0.20 | |
| Grade 7 | 40 | 3.50 | 2.50 | 1.20 | 1.60 | 0.90 | 16.00 | 0.20 | |
