Magnesium binder used for pellet and preparation method and addition method thereof

A binder and magnesia technology, applied in the field of sintering additives, can solve the problems of high MgO content in sintered ore, reducing calcium ferrite content in sintered ore, influence of thermal state indicators, etc.

Inactive Publication Date: 2012-10-10
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the MgO content is too high, the content of calcium ferrite in the sinter will be reduced, thereby reducing the mechanical strength of the sinter
In addition, if the MgO content of sinter is too high, it will also have a great impact on the thermal index

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh the main chemical components as MgO33%, SiO 2 38% raw materials magnesite powder 350kg, bentonite 480kg, sodium carbonate 50kg, active lime 120kg.

[0023] Put the above-mentioned magnesite powder, bentonite and active lime into the grinder respectively, and make the particle size reach -320 mesh through fine grinding with a pass rate of 90%. Then blend the finely ground magnesite powder, bentonite and active lime together, put them into a powerful mixer for mixing, and gradually add 50kg of sodium carbonate while mixing. After the sodium carbonate and other raw materials are mixed evenly, take it out from the intensive mixer, put it in the sun to dry for 7.5 hours, and pack it in a large bag to become the finished product.

[0024] Before adding and using, put the magnesium binder into the pneumatic conveying tank car, and drive the pneumatic conveying tank car to the vicinity of the magnesium binder silo. Then use a pneumatic conveying tanker to transport the ...

Embodiment 2

[0026] Weigh the main chemical components as MgO36%, SiO 2 37% raw materials magnesite powder 320kg, bentonite 500kg, sodium carbonate 40kg, active lime 140kg.

[0027] Put the above-mentioned magnesite powder, bentonite and active lime into the grinder respectively, and make the particle size reach -320 mesh through fine grinding with a pass rate of 88%. Then blend the finely ground magnesite powder, bentonite and active lime together, put them into a powerful mixer for mixing, and gradually add 40kg of sodium carbonate while mixing. After the sodium carbonate and other raw materials are evenly mixed, take it out of the intensive mixer, put it in the sun for 9 hours, and pack it in a big bag to become the finished product.

[0028] Before adding and using, put the magnesium binder into the pneumatic conveying tank car, and drive the pneumatic conveying tank car to the vicinity of the magnesium binder silo. Then use a pneumatic conveying tanker to transport the prepared magn...

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Abstract

The invention provides a magnesium binder used for a pellet and a preparation method and an addition method thereof. The preparation method comprises: adding 30-35% of magnesite powder having a passing rate more than 80% through a 320 mesh, 40-55% of bentonite and 12-15% of active lime into a mixer; mixing a mixture above while adding 3-5% of sodium carbonate; and pulling the mixture out and airing the mixture for 7-9h to get a finished product. The addition method comprises adding the binder to a surface of a pellet mixture on a material conveying belt according to a preset weight of the binder that should be conveyed of a unit time and a unit length and based on a ratio by weight from 2.5% to 4.5%. Pellet MgO can be improved by 1-2%, mechanical strength of the pellet can be improved by 1-2%, and an initial softening temperature can be improved by 100-150 DEG C with the magnesium binder added into the pellet mixture. Blast furnace output can be improved by about 5% and coke ratio can be reduced by 10 kg by the pellet using the binder in the invention.

Description

technical field [0001] The invention belongs to the field of sintering additives, and in particular relates to a magnesium binder used in sintering pellet mixtures, a preparation method thereof and a method for adding it to pellet mixtures. Background technique [0002] MgO mainly plays the role of slagging in the blast furnace smelting process. A certain amount of MgO in molten iron can improve the fluidity of slag, reduce the viscosity of slag, and facilitate desulfurization of molten iron. Generally speaking, the content of MgO in slag is required to be between 8 and 9%. between. [0003] In the blast furnace smelting process, the MgO in the slag mainly comes from sinter. Since the melting point of MgO is as high as 2799°C, during the sintering process, part of MgO is solid-dissolved in magnetite to form magnesium magnetite. When the MgO content is too high, the content of calcium ferrite in the sintered ore will be reduced, thereby reducing the mechanical strength of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/243
Inventor 孙俊波张延辉龙成俊
Owner ANGANG STEEL CO LTD
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