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Magnesium-rich bentonite binder for pellets

A magnesium-rich bentonite and binder technology, applied in the field of ironmaking pellet additives, can solve problems such as the decrease in the quality of blast furnace raw materials and smelting indicators, the reduction in the mechanical strength of finished sinter, and the reduction in sinter grade, so as to increase the output of blast furnaces, Improving the condition of blast furnace and improving the mechanical strength

Inactive Publication Date: 2013-06-05
HAICHENG GUOTIAN MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the addition of MgO-containing minerals in the sintering production process, not only the grade of the sintered ore is reduced; but also due to the high melting point of MgO (2799 ° C), part of the MgO is solid-dissolved in the magnetite during the sintering process to form magnesium magnetite. When the MgO content is too high When it is high, it will reduce the content of calcium ferrite in sinter, thereby reducing the mechanical strength of finished sinter, and directly lead to the decline of blast furnace raw material quality and smelting index

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The magnesium-rich bentonite binder is composed of bentonite and magnesite powder in different proportions.

[0019] First, the magnesite with MgO content of 47%, SiO 2 Bentonite and borax with a content of 81% were crushed and ground into magnesite powder, bentonite powder and borax powder with a particle size of -200 mesh and a pass rate of 91%. Then, take by weighing magnesite powder 200kg, bentonite powder 600kg, borax powder 200 kg, after fully mixing, make 1000kg magnesium-rich bentonite binder.

[0020] When it needs to be added to the pellets, the bentonite binder is first transported to the pellet batching mine tank with a suction tanker, and then participates in the pellet batching. Add 1000kg of magnesium-rich bentonite binder to 50t of pellets.

Embodiment 2

[0022] First, the magnesite with MgO content of 44%, SiO 2 Bentonite and borax with a content of 86% were pulverized and ground into magnesite powder, bentonite powder and borax powder with a particle size of -200 mesh and a pass rate of 93%. Then, take magnesite powder 300kg, bentonite powder 500kg, borax powder 200 kg, make 1000kg magnesium-rich bentonite binder after fully mixing.

[0023] When it needs to be added to the pellets, the bentonite binder is first transported to the pellet batching mine tank with a suction tanker, and then participates in the pellet batching. Add 1000kg magnesium-rich bentonite binder to 36t pellets.

Embodiment 3

[0025] First, the magnesite with 45% MgO content, SiO 2 Bentonite and borax with a content of 84% were pulverized and ground into magnesite powder, bentonite powder and borax powder with a particle size of -200 mesh and a pass rate of 92%. Then, take by weighing magnesite powder 250kg, bentonite powder 580kg, borax powder 170 kg, make 1000kg magnesium-rich bentonite binder after fully mixing.

[0026] When it needs to be added to the pellets, the bentonite binder is first transported to the pellet batching mine tank with a suction tanker, and then participates in the pellet batching. Add 1000kg of magnesium-rich bentonite binder to 40t of pellets.

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Abstract

The invention provides a magnesium-rich bentonite binder for pellets. The magnesium-rich bentonite binder comprises the following raw material components: 20-30% of magnesite powder, 50-60% of bentonite and 10-20% of borax. The MgO content in the bentonite binder is 28-32%, and the SiO2 content is less than 50%; and the 200-mesh passing rate is more than 90%. The adding amount of the bentonite binder accounts for 2.0-3.0wt% of the total weight of pellet ore raw materials. According to the magnesium-rich bentonite binder disclosed by the invention, the MgO content in the pellet ore can be improved by 1-2%, the grade of sintered ore is improved, the mechanical strength of the pellet ore is simultaneously improved by 1-2%, the smelting in a blast furnace can be strengthened, the problems of material slip and material collapse caused by shutoff pressure due to poor air permeability of a charge of the blast furnace are reduced, the accidents of the blast furnace are reduced, the utilization coefficient of the blast furnace is improved, the initial softening temperature is increased by 100-150 DEG C, the yield of the blast furnace is increased by above 5%, and the ratio of putting coke into the furnace is reduced by 10kg, so that a foundation is laid for oxygen-rich, coal injection and large-ore batch operation of the blast furnace and the smooth production of the blast furnace is ensured.

Description

technical field [0001] The invention belongs to the technical field of ironmaking pellet additives, in particular to a magnesium-rich bentonite binder used in blast furnace smelting pellets. Background technique [0002] In the blast furnace smelting process, MgO mainly solves the fluidity problem of slag. Since MgO in molten iron can reduce the viscosity of slag, the MgO content in slag is usually controlled at about 10% to facilitate desulfurization of molten iron. [0003] At present, MgO in blast furnace slag mainly comes from sinter. Due to the addition of MgO-containing minerals in the sintering production process, not only the grade of sintered ore will be reduced; but also due to the high melting point of MgO (2799 ° C), part of MgO will be solid-dissolved in magnetite during sintering to form magnesium magnetite. When it is high, it will reduce the content of calcium ferrite in sinter, thereby reducing the mechanical strength of finished sinter, and directly lead ...

Claims

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Application Information

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IPC IPC(8): C22B1/243
Inventor 毕德玉张倭铭
Owner HAICHENG GUOTIAN MINING CO LTD
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