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A kind of preparation method of slagging agent for steelmaking

A technology of slagging agent and oxide, which is applied in the manufacture of converters, etc., can solve the problems of shortening the initial slag formation time and pure oxygen blowing time, slow slag incoming speed, and low dephosphorization rate, so as to shorten the initial slag formation time And pure oxygen blowing time, reduce the pressure of environmental protection, good effect of dephosphorization

Active Publication Date: 2016-02-03
山西高义钢铁有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems existing in the prior art that the slagging agent is difficult to melt and the slagging speed is slow during use, the present invention provides a preparation method of a slagging agent for steelmaking, which can shorten the initial slag formation time and pure It can effectively solve the problems of slow slag formation and low dephosphorization rate during smelting, and improve the dephosphorization efficiency of smelting

Method used

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  • A kind of preparation method of slagging agent for steelmaking
  • A kind of preparation method of slagging agent for steelmaking
  • A kind of preparation method of slagging agent for steelmaking

Examples

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Embodiment 1

[0023] The preparation method of the slagging agent of the present embodiment comprises SiO 2 , CaO, MnO and iron oxides mixed evenly, SiO 2 , CaO, MnO and the oxides of iron to form each component and its mass fraction of the mixture formed after adding:

[0024]

[0025] Among them, 65wt.% of CaO comes from converter sludge, 75wt.% of iron oxides (of which, FeO32wt.%, Fe 2 o 3 43wt.%) comes from converter sludge. The resulting mixture was then formed into spherical particles having a bulk density of 2.2 g / cm 3 and an average diameter of 20 mm.

[0026] The slagging agent provided in this example can not only shorten the initial slag formation time and improve the dephosphorization effect, but the MnO in it is also beneficial to the subsequent slag splashing to protect the furnace. Compared with the slagging agent provided by the prior art, the formation speed of the primary slag is increased by more than 150 seconds, and the dephosphorization efficiency is increased b...

Embodiment 2

[0028] The preparation method of the slagging agent of the present embodiment comprises SiO 2 , CaO, MnO and iron oxides mixed evenly, SiO 2 , CaO, MnO and the oxides of iron to form each component and its mass fraction of the mixture formed after adding:

[0029]

[0030] In this example, 85wt.% of CaO comes from lightly burned dolomite, 90wt.% of iron oxides (wherein FeO32wt.%, Fe 2 o 3 43wt.%) comes from manganese ore. The resulting mixture was then formed into spherical particles having a bulk density of 3.4 g / cm 3 and an average diameter of 50 mm.

[0031] The slagging agent provided in this example can not only shorten the initial slag formation time and improve the dephosphorization effect, but the MnO in it is also beneficial to the subsequent slag splashing to protect the furnace. Compared with the slagging agent provided by the prior art, the formation speed of the primary slag is increased by more than 160 seconds, and the dephosphorization efficiency is incr...

Embodiment 3

[0033] The preparation method of the slagging agent of the present embodiment comprises SiO 2 , CaO, MnO and iron oxides mixed evenly, SiO 2 , CaO, MnO and the oxides of iron to form each component and its mass fraction of the mixture formed after adding:

[0034]

[0035] In this example, 75wt.% of CaO comes from lime, 80wt.% of iron oxides (wherein, FeO32wt.%, FeO32wt.%, Fe 2 o 3 48wt.%) comes from manganese ore. The resulting mixture was then formed into spherical particles having a bulk density of 3.0 g / cm 3 and an average diameter of 30 mm.

[0036] The slagging agent provided in this example can not only shorten the initial slag formation time and improve the dephosphorization effect, but the MnO in it is also beneficial to the subsequent slag splashing to protect the furnace. Compared with the slagging agent provided by the prior art, the formation speed of the primary slag is increased by more than 180 seconds, and the dephosphorization efficiency is increased b...

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Abstract

The invention discloses a preparation method of a slag forming agent for steelmaking and belongs to the technical field of steelmaking. The slag forming agent comprises the following components in percent by weight: 70-73% of SiO2, 11-14% of CaO, 2% of MnO, 8-10% of FeO, 4% of Fe2O3, less than or equal to 0.10% of S, less than or equal to 0.1% and the balance of Fe and inevitable impurities. The preparation method disclosed by the invention has the advantages that the slag forming time at the early stage and the pure oxygen-blowing time can be shortened, the problems of low slag forming and low dephosphorization rate in smelting can be effectively solved, and the dephosphorization efficiency of smelting is improved.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and more specifically relates to a preparation method of a slagging agent for steelmaking. Background technique [0002] The slag-forming agent is made of lime and an appropriate amount of flux such as iron oxide scale, fluorite, manganese oxide or other oxides, and is prefabricated at low temperature. This synthetic slag agent has low melting point, high alkalinity, uniform composition, small particle size, and is easy to break at high temperature, and the slagging speed is fast, thus reducing the burden of converter slagging. During steelmaking, the added slag-forming flux is fused with the oxidation products of impurity elements in the raw material to form slag, which removes S and P and absorbs non-metallic inclusions. [0003] Publication number CN101928806A, the patent document published on December 29, 2010, discloses a composite slagging agent for semi-steel making. The composite sl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/36
Inventor 魏周
Owner 山西高义钢铁有限公司
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