Lead concentrate quality standard
| grade | The number of Pb mass molecules is not less than % | Impurity mass number of molecules is not more than % | ||||
| Cu | Zn | As | MgO | Al 2 O 3 | ||
| First grade | 70 | 1.2 | 4 | 0.2 | 1.0 | 2.0 |
| Second grade product | 65 | 1.5 | 5 | 0.3 | 1.5 | 2.5 |
| Third grade | 55 | 2.0 | 6 | 0.4 | 1.5 | 3.0 |
| Fourth grade | 45 | 2.5 | 7 | 0.6 | 2.0 | 4.0 |
| Note: Gold and silver in lead concentrate are valuable elements and should be reported as analytical data; impurities of other types of lead concentrates are required by both parties. | ||||||
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