Fluorine-containing magnesium oxide pellet ore

A technology for magnesium oxide pellets and content, which is applied in the field of metallurgy to achieve the effects of decreasing expansion rate, increasing dripping temperature and improving blast furnace production indicators

Inactive Publication Date: 2010-05-26
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The data show that over-alkaline pellets are produced at home and abroad, mainly by adding serpentine to adjust the alkalinity and...

Method used

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  • Fluorine-containing magnesium oxide pellet ore
  • Fluorine-containing magnesium oxide pellet ore
  • Fluorine-containing magnesium oxide pellet ore

Examples

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Embodiment

[0016] Adopt 162m 2 The belt roaster produces fluorine-containing magnesium oxide pellets.

[0017] The fluorine-containing magnesium oxide pellets of the present invention use iron concentrate as the main material, light-burned dolomite as the flux, and bentonite as the binder for processing. Iron concentrate+50wt% purchased domestic iron concentrate, Bayan Obo mixed iron concentrate is composed of 70wt% Bayan Obo iron concentrate+30wt% purchased domestic ordinary iron concentrate; bentonite accounts for 1.0%~1.2wt% in the raw material , Light burning dolomite accounts for 3% to 4wt% in the raw material.

[0018] Referring to the attached drawings, firstly, the iron ore concentrate, bentonite and light-burned dolomite are proportioned in the proportioning room, and the prepared mixture is mixed by a strong mixer, and then enters the pelletizing disc to make pellets. The 8-16mm green pellets are distributed on the belt roaster, and through five stages of drying, preheating, ...

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Abstract

The invention relates to a fluorine-containing magnesium oxide pellet ore which comprises the following raw materials: an iron material, bentonite and caustic calcined dolomite. The iron material is the mixed iron ore concentrate of Baotou steel Baiyun'ebo iron ore concentrate and common iron ore concentrate; the proportion of the Baiyun'ebo iron ore concentrate in the iron material is larger than 0 and not larger than 60wt percent, the bentonite accounts for 1.0-1.2wt percent relative to the raw materials, and the caustic calcined dolomite accounts for 3-4wt percent relative to the raw materials, wherein in the caustic calcined dolomite, CaO content is larger than 40wt percent, MgO content is not smaller than 28wt percent, SiO2 content is smaller than 8.0wt percent, and the proportion of granularity of 200 meshes is not smaller than 80wt percent; and MgO/SiO2 content in the fluorine-containing magnesium oxide pellet ore is not larger than 0.5. The invention fully utilizes Baotou steel Baiyun'ebo iron ore resources and can reduce the dosage of the bentonite and improve the reducibility and dropping temperature of the pellet ore by adjusting the pellet ore alkalinity and magnesium oxide content through adopting the dolomite; compared with acid pellet ore, the magnesium oxide pellet ore improves the reducibility and a low-temperature reduction degradation index, reduces the expansion ratio, and can meet the production requirement of a large blast furnace though with slightly reduced compressive strength of the pellet ore.

Description

Technical field: [0001] The invention relates to a fluorine-containing magnesium oxide pellet, which belongs to the field of metallurgy. Background technique: [0002] Due to historical reasons, most of the blast furnace charge structures in my country are mainly high basicity sintered ore, with some acidic pellets or lumps. Therefore, pellet manufacturers mainly produce acidic pellets. Compared with high-basicity sinter, acid pellets have poor metallurgical properties, lower soft melt dripping temperature, and poor high-temperature reduction degree. The research shows that increasing the MgO content in pellets is an effective measure to improve its reflow temperature and high temperature reducibility. [0003] The data show that the production of over-alkaline pellets at home and abroad is mainly by adding serpentine to adjust the alkalinity and MgO content of the pellets, while dolomite or light-burned dolomite is used to produce flux pellets. There are no reports at hom...

Claims

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Application Information

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IPC IPC(8): C22B1/243
Inventor 邬虎林崔玉元吴雷陈革曹立刚段祥光
Owner INNER MONGOLIA BAOTOU STEEL UNION
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