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Lime-based molten iron desulfurizer and preparation method thereof

A technology of molten iron desulfurization and lime, applied in the field of desulfurization outside the furnace, can solve the problems of erosion of refractory materials, polluted air, circulating water, high fluorine content of desulfurization slag, and achieve the effect of reducing desulfurization cost and low cost

Active Publication Date: 2020-11-24
李杉
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, due to the use of fluorite, the KR method pollutes the air and circulating water; erodes the refractory material lining the molten iron; and the desulfurization slag has a high fluorine content, and the open-air stacking pollutes the soil and surface water, and cannot be used as a raw material for building materials Or the application of paving materials, that is, there are problems such as the discharge, storage and reuse of desulfurization slag

Method used

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  • Lime-based molten iron desulfurizer and preparation method thereof
  • Lime-based molten iron desulfurizer and preparation method thereof
  • Lime-based molten iron desulfurizer and preparation method thereof

Examples

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Embodiment 1

[0052] A lime-based molten iron desulfurizer, comprising 90% lime and 10% desulfurization additive by weight percentage, wherein the desulfurization additive utilizes at least metal Al, elemental Si, Al 2 o 3 The by-products of the aluminum industry are used as raw materials, which are prepared by grinding, grading, particle size adjustment, and adding corresponding raw materials according to their composition limits. The desulfurization additives include by weight percentage:

[0053]

[0054] CaO 87%, MgO 1.9%, SiO in lime 2 1.6%, S 0.046%, loss on ignition ≤5.0%. The activity of lime is 285 under the conditions of 4mol / ml 40±1°C and 10min. The particle size of lime is 0.64mm.

[0055] Al and simple Si are powdery materials fired at high temperature, with a particle size of 2mm. 2 o 3 , MgO and SiO 2 The particle size is 80 mesh, and it is also a material that has been fired at high temperature. The water content of the desulfurization additive is 0.38%. The carb...

Embodiment 2

[0057] The lime-based molten iron desulfurizer of this embodiment is different from that of Example 1 in that it includes 85% lime and 15% desulfurization additive by weight percentage and the powder MgCO in the desulfurization additive 3 The content of is 4%, and the carbonate particle size is 0.4mm, and all the other are with embodiment 1.

Embodiment 3

[0059] The lime-based molten iron desulfurizer of this embodiment is different from that of Example 1 in that it includes 80% lime and 20% desulfurization additive by weight percentage and the powder MgCO in the desulfurization additive 3 The content of is 5%, and all the other are with embodiment 1.

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Abstract

The embodiment of the invention relates to a lime-based molten iron desulfurizer and a preparation method thereof. The desulfurizer comprises the following components in percentage by weight: 60-90% of lime and 8-40% of desulfurization additive, wherein the desulfurization additive comprises the following components in percentage by weight: 45-75% of Al2O3, 8-30% of Al, 2-8% of simple substance Si, 2-14% of MgO and 3-14% of SiO2. The molten iron desulfurizer provided by the invention adopts metallurgical common lime, and also adopts renewable resource materials which contain metal aluminum, silicon and activated alumina and can completely replace fluorite. The desulfurization effect of the molten iron desulfurizer provided by the invention is the same as that of the fluorite, and the molten iron desulfurizer is lower in cost and more environment-friendly.

Description

technical field [0001] The invention relates to the technical field of out-of-furnace desulfurization in iron and steel metallurgical process flow, in particular to a fluorine-free desulfurizer material and a preparation method for desulfurizing molten iron or molten steel in a blast furnace. Background technique [0002] The modern traditional steel production process is mainly composed of blast furnace-converter-continuous casting-rolling and other processes. Sulfur is a harmful impurity in steel, which seriously affects the performance and internal quality of steel. Therefore, removing sulfur in steel is one of the important tasks in the steel production process. As the society has higher and higher requirements for the quality and performance of various steel products, and considering the sulfur load of blast furnace ironmaking ingredients and the burden of desulfurization of raw material molten iron in the converter steelmaking process, desulfurization, desiliconization...

Claims

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Application Information

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IPC IPC(8): C21C7/064
CPCC21C7/0645Y02P10/20
Inventor 李继宗李杉史玉山
Owner 李杉
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