Metallurgical grade chromite ore and mining with technical indicators
| project | Deposit and ore type | ||
| Endogenous deposit | |||
| Rich mine | Lean mine | ||
| ω(Cr2O3) | Boundary grade | ≥25 | ≥5~8 |
| The lowest industrial grade | ≥32 | ≥12 | |
| The lowest available thickness m | 0.3~0.5 | 1.0 | |
| Stone removal thickness m | 0.5 | 1.0 | |
Note 1: chrome ore or concentrate for metallurgy, ω(Cr2O3)/ω(FeO)>2 during pyrometallurgical smelting (metal chromium is not restricted by wet method); ω(SiO2)≤8% The ore-heating method is not limited by the smelting of high-carbon ferrochrome; ω(P)≤0.07%, ω(S)≤0.05%.
2: chrome ore or concentrate for refractory materials, ω (SiO2) ≤ 10%, ω (CaO) ≤ 3%, ω (FeO) ≤ 14%.
3: chrome ore or concentrate for chemical industry ω (SiO2) ≤ 8%, ω (A12O3) ≤ 15%.
4: chrome ore for diabase cast stone, ω (Cr2O3) ≥ (10% ~ 20%), ω (SiO2) < 10%.
5: When the total amount is selected from PGE for an associated chromite reaches 10-6 (0.3 ~ 0.4) ×, evaluation should be made.
6: The selection of lean grades is generally twice the grade of tailings.
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 complex ore layer.
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Camera One camera input (RCA port)
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