1. steelmaking iron ore (formerly known as open-hearth bonanza)
Ore into the furnace block requirements:
Iron ore for open hearth 50~250mm;
Iron ore for electric furnace 50~100mm;
The iron ore for the converter is 10 to 50 mm.
The ore quality requirements directly used for steelmaking are shown in Table 1 (for magnetite ore, hematite ore, limonite ore).

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2. Iron ore for iron making (formerly known as blast furnace rich ore)
Ore into the furnace block requirements: generally 8 ~ 40mm.
Iron ore for iron making can be divided into: according to the pH of the slag component:
Alkaline ore (CaO+MgO) / (SiO 2 +Al 2 O 3 )>1.2;
Self-fluxing ore (CaO+MgO) / (SiO 2 +Al 2 O 3 )=0.8～1.2
Semi-self-fluxing ore (CaO+MgO) / (SiO 2 +Al 2 O 3 )=0.5-0.8
Acid ore (CaO+MgO) / (SiO 2 +Al 2 O 3 )<0.5
The quality requirements for iron ore used directly in blast furnace ironmaking are shown in Table 2 (applicable to various iron ore type lump ore).

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Acid converter steelmaking pig iron ore P≤0.03%
Alkaline open hearth steelmaking pig iron ore P≤0.03%～0.18%
Alkaline side blowing converter steelmaking pig iron ore P≤0.2%～0.8%
Thomas pig iron ore P ≤ 0.8% ~ 1.2%
Ordinary foundry pig iron ore P≤0.05%～0.15%
High phosphorus cast pig iron ore P≤0.15%～0.6%

3. Need to choose iron ore
For ore or iron ore containing associated beneficial components with high iron content or high iron content but harmful impurities exceeding the specified requirements, beneficiation treatment is required. The selected iron concentrate is sintered or pelletized by batching. After processing, it can be used in the furnace.
Iron ore requirements subject to beneficiation:
Magnetite ore TFe≥25%, mFe≥20%;
Hematite ore TFe≥28%～30%;
Siderite ore TFe≥25%;
Limonite ore TFe≥30%;
For the type of ore industry to be selected, it is usually based on a single weak magnetic separation process and is divided by magnetic iron occupancy. According to China's mine production experience, the general standard is: [next]
Ore type mFe/TFe (%)
Single weak magnetic ore ≥65
Other process ore selection <65
Another classification criterion can be applied to magnetite ore or hematite:
mFe/TFe ≥85 magnetite ore mFe/TFe 85~15 mixed ore mFe/TFe ≤15 hematite ore

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March 31, 2024