A kind of magnesia composite bentonite for pelletizing

A technology of bentonite and magnesia, which is applied in the field of magnesia composite bentonite, can solve the problems of reducing calcium ferrite content in sinter, reducing the mechanical strength of sinter, and high melting point of MgO, so as to strengthen blast furnace smelting, improve sinter quality, and reduce thickness Effect

Inactive Publication Date: 2016-03-30
王志
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Problems solved by technology

[0004] The MgO in the slag of the blast furnace smelting process mainly comes from the sintered ore. Due to the high melting point of MgO, during the sintering process, part of the MgO is solidified in the magnetite to form magnesium magnetite, which will reduce the content of calcium ferrite in the sintered ore, thereby reducing the sintering process. mine mechanical strength
In addition, if the MgO content in sinter is too high, it will also have a great impact on the thermal index

Method used

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  • A kind of magnesia composite bentonite for pelletizing

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Embodiment Construction

[0013] In the following, the present invention will be further described in conjunction with the embodiments.

[0014] The components and wt% content of magnesia composite bentonite in the examples are shown in Table 1.

[0015] Example 1~4 Magnesium composite bentonite component wt% content table

[0016]

[0017] At the same time, the MgO and SiO in the magnesium composite bentonite should be controlled 2 And moisture to ensure that the content of the main chemical components is controlled within: 25-30% of MgO, SiO 2 45~55%, and moisture content <15%.

[0018] The specific compounding method of the magnesia composite bentonite of the present invention is:

[0019] According to the requirements of the blast furnace for the MgO content in the pellets, during the pellet batching process, the batching ratio is converted into weight kilograms, controlled by the electronic belt scale, and added to the pellets according to the ratio of 3.5 to 4.0% of the magnesium composite bentonite It ca...

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Abstract

The invention provides magnesium composite bentonite for pelletizing. The bentonite comprises the following components in percentage by weight: 20-30% of light-burned magnesite powder, 60-70% of bentonite, 3-5% of sodium carbonate, 2-3% of calcium ricinoleate and 3-5% of calcium chloride; the magnesium composite bentonite comprises the following main chemical components in percentage by weight: 25-30% of MgO, 45-55% of SiO2, and less than 15% of water. By adopting the magnesium composite bentonite disclosed by the invention, the MgO content of a pellet ore can be increased to 1.5%, the mechanical strength of the pellet ore can be increased by 1.5-2%, the initial softening temperature of the pellet ore can be increased by 150-200 DEG C, the MgO content of a sintering ore can be reduced relatively, the quality of the sintering ore can be improved, and the consumption of a sintering fuel can be reduced.

Description

Technical field [0001] The invention belongs to the technical field of iron smelting pellets, and in particular relates to a magnesia composite bentonite used for the production of pellets in a steel enterprise pellet plant. Background technique [0002] At present, domestic iron and steel enterprises generally adopt the raw material structure of high basicity sinter with acid pellets in the blast furnace smelting charge structure of domestic iron and steel enterprises. The MgO content in high basicity sinters is about 2.0-2.5%, and the acid pellets do not contain MgO. [0003] In the blast furnace smelting process, MgO mainly plays a role in slagging. A certain amount of MgO in the molten iron can improve the fluidity of the slag, reduce the viscosity of the slag, and is beneficial to the desulfurization of the molten iron. The MgO content in the slag is generally required to be in the range of 8-9% . [0004] The MgO in the slag of the blast furnace smelting process mainly comes f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/24
Inventor 王志赵海元王自力
Owner 王志
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