Chrome iron ore grade and mining technology indicators
| project | Deposit and ore type | ||
| Endogenous deposit | |||
| Rich mine | Lean mine | ||
| ω (Cr 2 O 3 )% | Boundary grade | ≥ 25 | ≥ 5 to 8 |
| Minimum industrial grade | ≥ 32 | ≥ 12 | |
| Minimum recoverable thickness m | 0.3 to 0.5 | 1.0 | |
| Stone removal thickness m | 0.5 | 1.0 | |
| Note 1: when using metallurgical chromite ore or concentrate, pyrometallurgical ω (Cr 2 O 3) / ω (FeO)> 2 ( wet refining of metallic chromium is not limited thereto); ω (SiO 2) ≤ 8 % ( not subject to the smelting of high-carbon ferrochrome by ore heat method ) ; ω (P) ≤ 0.07 %, ω (S) ≤ 0.05 %. Note 2 : chrome ore or concentrate for refractory materials, ω (SiO 2 ) ≤ 10 %, ω (CaO) ≤ 3 %, ω (FeO) ≤ 14 %. Note 3 : chrome ore or concentrate for chemical industry ω (SiO 2 ) ≤ 8 %, ω (A1 2 O 3 ) ≤ 15 %. Note 4 : chrome ore for diabase cast stone, ω (Cr 2 O 3 ) ≥ (10 % to 20 % ) , ω (SiO 2 ) <10 %. Note 5: When the total amount is selected from PGE for an associated chromite reaches (0.3 ~ 0.4) × -6 10, should be assessed. Note 6 : The selection of lean grades is generally twice the grade of tailings. Note 7 : The selection of the minimum mining thickness of the rich ore is 0.5m for the single ore layer and 0.3m for each layer of the double ore layer. | |||
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