Ore coal, melting ironmaking method after direct reduction-flotation-agglomeration

A post-smelting, direct technology, applied in the field of ore, coal-direct reduction-separation-smelting after agglomeration, which can solve the technical indicators that are difficult to meet the requirements of materials, chemical composition, physical properties and metallurgical properties, etc. question

Active Publication Date: 2009-03-18
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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Problems solved by technology

However, a large amount of low-grade iron ore and oolitic hematite, ultrafine particle hematite, limonite, siderite, etc. in the prior art are not suitable for conventional blast furnaces because of their chemical composition, physical properties and metallurgical properties. sleeping undergroun

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  • Ore coal, melting ironmaking method after direct reduction-flotation-agglomeration

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Embodiment Construction

[0013] Ore of the present invention, coal-direct reduction sorting-melting ironmaking method after agglomeration, its preferred specific implementation mode is as shown in Figure 1, comprises steps:

[0014] First prepare the raw materials:

[0015] Coal: Various non-coking coals can be selected, and the particle size of the coal is ≤5mm.

[0016] Iron ore: suitable for ore iron grade 20-60%, ore particle size ≤ 5mm; one or more of the following iron ores can be selected: oolitic hematite, ultrafine grain hematite, limonite , Siderite. Other iron ores can also be used as required.

[0017] Flux: one or more of limestone, magnesia limestone, and dolomite can be selected as flux; flux particle size ≤ 5mm. Other raw materials can also be used as solvents.

[0018] The above three raw materials are mixed in the following parts by weight:

[0019] Coal: 10-30 parts;

[0020] Iron ore: 70-80 parts;

[0021] Flux: 0-20 parts.

[0022] After mixing, the particle diameters of t...

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Abstract

The invention discloses a method for carrying out direct reduction, sorting, agglomeration, smelting and ironmaking on ore and coal. Firstly, certain amount of the ore, the coal and a solvent are mixed, are placed in a rotary hearth furnace and are heated to the temperature of between 1,100 and 1,350 DEG C, are kept at the temperature for 15 to 40 minutes and are directly reduced to obtain a reduced iron material with metallizing rate of between 80 and 92 percent; the reduced iron material at high temperature of between 800 and 1,100 DEG C is directly transported into water, is cooled and is subjected to fine grinding and sorting; and the iron material after the fine grinding and sorting is subjected to drying and agglomeration by high-temperature oxygen-lost exhaust gas and finally is transported into a submerged arc furnace or other smelting equipment for carrying out slag-iron separation and molten iron production. The method has a simple process, short flow and high efficiency, needs no coke and is suitable for low-grade ore and non-blast furnace ore which is difficult to be used by the prior blast furnaces, such as oolitic hematite, ultrafine particle hematite, limonite, siderite and the like.

Description

technical field [0001] The invention relates to an iron ore smelting process, in particular to an ore, coal-direct reduction-sorting-agglomeration followed by melting ironmaking method. Background technique [0002] The blast furnace ironmaking method is a commonly used ironmaking technology in the prior art. However, a large amount of low-grade iron ore and oolitic hematite, ultrafine particle hematite, limonite, siderite, etc. in the prior art are not suitable for conventional blast furnaces because of their chemical composition, physical properties and metallurgical properties. Use it and sleep in the ground. The traditional beneficiation methods are powerless to this kind of ore, whether it is gravity separation, flotation, magnetic separation, magnetization roasting, the technical indicators of various beneficiation are difficult to meet the requirements of conventional blast furnace materials. Contents of the invention [0003] The object of the present invention i...

Claims

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Application Information

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IPC IPC(8): C21B13/00
Inventor 吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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