Beneficiation method for producing blast furnace lump ore by hematite at medium-high grade

A beneficiation method and iron ore technology, which is applied in the beneficiation of medium and high-grade hematite ore, and in the field of blast furnace lump ore, can solve the problems of inability to obtain high-grade hematite ore, achieve comprehensive utilization of large quantities, improve recovery rate, and reduce emissions significant effect

Inactive Publication Date: 2012-11-14
SINOSTEEL MAANSHAN INST OF MINING RES +2
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Problems solved by technology

The hematite ore pre-selection method introduced in the above literature can improve the grade of the pre-selection concentrate and throw out some tailings, but it cannot obtain high-grade hematite lump ore that can be directly put into the furnace

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  • Beneficiation method for producing blast furnace lump ore by hematite at medium-high grade
  • Beneficiation method for producing blast furnace lump ore by hematite at medium-high grade
  • Beneficiation method for producing blast furnace lump ore by hematite at medium-high grade

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Embodiment Construction

[0015] In order to further describe the present invention, a kind of beneficiation method of utilizing middle and high-grade hematite ore to produce blast furnace lump ore of the present invention will be further described below in conjunction with accompanying drawings and examples.

[0016] The ore processed in this example is the actual ore produced in the stope of Hainan Mining Co., Ltd., and the iron grade of the raw ore is 39.16%.

[0017] Multi-element analysis and iron phase analysis were carried out on the raw ore, and the results are shown in Table 1 and Table 2.

[0018] The analysis results show that the main useful mineral in the ore is hematite, followed by magnetite, the content of iron carbonate, iron silicate and pyrite is relatively low, and the iron of hematite accounts for 82.28%. The sulfur content of harmful impurities is 0.117%, and the phosphorus content is low, (CaO+MgO) / (SiO 2 +Al 2 o 3 )=0.176, it is an acidic ore.

[0019] Table 1 Results of mul...

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Abstract

The invention discloses a beneficiation method for producing blast furnace lump ore by hematite at a medium-high grade. The method comprises the following steps of: crushing the hematite with the iron grade being greater than or equal to 39%, and grading the hematite into materials with two size fractions of 40mm-10mm and -10mm; carrying out dry-type strong magnetic roughing, primary dry-type strong magnetic scavenging and secondary dry-type strong magnetic scavenging on the materials with the size fraction of 4mm-10mm to respectively obtain dry-type strong magnetic roughing ore concentrate, primary dry-type strong magnetic scavenging ore concentrate, secondary dry-type strong magnetic scavenging ore concentrate and lump ore tails, and combining and feeding the dry-type strong magnetic scavenging ore concentrate, the primary dry-type strong magnetic scavenging ore concentrate and the secondary dry-type strong magnetic scavenging ore concentrate to a jigging reselection operation to obtain the blast furnace lump ore; and combining tails in the jigging reselection with the materials with the grade of -10mm into middlings, and feeding the middlings to subsequent grinding and selecting operations for grading. By adopting the method, part qualified blast furnace lump ore can be obtained in advance, the lump tails can be ejected, the goal ore grinding amount (namely the amount of the middlings) can be greatly reduced, and thus the energy consumption for grinding and selection can be greatly reduced.

Description

technical field [0001] The invention relates to a beneficiation method of hematite ore, in particular to a beneficiation method of middle and high grade hematite ore, especially suitable for processing middle and high grade hematite ore with iron grade ≥ 39%, and can obtain iron grade ≥ 54% blast furnace lump ore. Background technique [0002] Lump ore, especially high-grade lump ore, is one of the important iron-containing raw materials used in blast furnaces. Together with high-basic sinter and acidic oxidized pellets, it forms the iron-containing charge structure of the blast furnace. Structure lays an important foundation. In order to reduce the proportion of small ball sinter in the charge structure and reduce the cost of pig iron, under the condition of lack of mature acid charge, mix in an appropriate proportion of high-grade lump ore, increase the proportion of lump ore, strengthen the blast furnace and improve the index There are certain advantages in balancing an...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03C1/00B03B5/10
Inventor 郭风芳李俊宁黎龙珠孙炳泉杨任新王炬袁启东李亮
Owner SINOSTEEL MAANSHAN INST OF MINING RES
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