Dephosphorizing agent for low-silicon molten iron steelmaking and preparation and using method thereof

A dephosphorization agent and molten iron technology, which is applied in the field of iron and steel metallurgy technology and resource recycling, can solve the problems of sticky flue dephosphorization rate, easy sticking gun, difficulty in slag formation, etc., so as to solve the difficulty in slag formation and improve the dephosphorization rate. , the effect of low cost

Pending Publication Date: 2019-09-27
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] In order to solve the above problems, the present invention provides a dephosphorization agent for low-silicon molten iron steelmaking and its preparation and use method. The present invention can not only realize

Method used

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Examples

Experimental program
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Example Embodiment

[0047] Example 1

[0048] For 100t electric arc furnace, smelting silicon content is 0.15%, phosphorus content is 0.080% low-silicon molten iron, adopt dephosphorization agent of the present invention, the preparation raw material of dephosphorization agent is magnesium reduction slag, lime particle and iron oxide scale, will The three raw materials of magnesium reduction slag, lime particles and iron oxide scale are mixed according to the mass ratio of 1.5:1:0.8. The mixture is run through a ball mill for 45 minutes and mixed evenly until it is less than 0.5mm, and then 6% water glass is added as a binder. A dephosphorization agent with a particle size of 10-30 mm is pressed by a ball press; in the dephosphorization agent prepared in this embodiment, the components and contents are: CaO: 54.44%, Fe 2 o 3 :26.58%, SiO 2 : 11.42%, MgO: 5.20%, Al 2 o 3 :0.68%.

[0049] Apply the dephosphorization agent of this example to 35kg / t molten iron in 100t electric arc furnace to sm...

Example Embodiment

[0050] Example 2

[0051] For the 300t converter double steelmaking process, the silicon content of molten iron after dephosphorization converter pretreatment is only 0.02%, and the phosphorus content is 0.035%. Using the dephosphorization agent described in the present invention, the raw materials for preparation are magnesium reduction slag and lime particles and iron oxide scale, the three raw materials of magnesium reduction slag, lime particles and iron oxide scale are mixed according to the mass ratio of 3:1:0.5, and the mixture is ground by a ball mill for 30 minutes until it is evenly mixed below 2mm, and then 5% water glass is added As a binding agent, a dephosphorizing agent with a particle size of 10-30mm is pressed by a ball press; in the dephosphorizing agent prepared in this embodiment, in terms of mass percentage, the components and contents are: CaO: 56.69%, Fe 2 o 3 :15.15%, SiO 2 : 17.69%, MgO: 7.78%, Al 2 o 3 : 1.34%.

[0052] Apply the dephosphorizati...

Example Embodiment

[0053] Example 3

[0054] For the 100t converter steelmaking process, the silicon content of molten iron used is 0.50%, and the phosphorus content is 0.125%. Using the dephosphorization agent of the present invention, the raw materials for preparation are magnesium reduction slag, lime particles and iron oxide scale, and the magnesium reduction slag, The three raw materials of lime particles and iron oxide scale are mixed according to the mass ratio of 0.5:2:0.5. The mixture is run through a ball mill for 50 minutes and ground to a size below 0.1mm. Machine pressed into a dephosphorizing agent with a particle size of 10-30mm; in the dephosphorizing agent prepared in this embodiment, in terms of mass percentage, the components and contents are: CaO: 75.00%, Fe 2 o 3 :17.27%, SiO 2 :5.00%, MgO:2.33%, Al 2 o 3 :0.34%.

[0055] The dephosphorization agent of this embodiment is applied to 100t converter to smelt low-silicon molten iron according to 15kg / t molten iron. Compared...

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Abstract

The invention belongs to the field of steel metallurgy technology and resource recycling, and relates to a dephosphorizing agent for low-silicon molten iron steelmaking and a preparation method and using method of the dephosphorizing agent. Magnesium reducing slag, lime particles and scale are mixed according to the mass ratio being (0.5-3):(1-2):(0.5-3), fully and uniformly mixed by a ball mill, added with a binder, and pressed by a ball press to obtain the dephosphorizing agent with the particle size being 1-60mm, and the dephosphorizing agent comprises, by mass, 25%-75% of CaO, 15%-65% of Fe2O3, 5%-25 % of SiO2, 1%-8% of MgO and 0.3%-3% of Al2O3. The proportion of the magnesium reducing slag is adjusted according to the silicon content of the molten iron in the preparation process, so that a multi-element dephosphorization slag system with low melting point and high fluidity can be formed. Recycling application of magnesium reduction slag can be achieved, the problems of difficult slagging, high slag melting point, likely gun sticking and the like of low-silicon molten iron steel making can be solved, the dephosphorization slagging speed is increased by 10% or more, and the dephosphorization rate is increased by 5% or more.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy technology and resource recycling, and relates to a dephosphorization agent for low-silicon molten iron steelmaking and a preparation and use method thereof. Background technique [0002] my country is the largest magnesium producer in the world, accounting for about 80% of the world's total output. For every ton of crude magnesium produced, about 5-8 tons of magnesium reduction slag is produced, the main components of which are CaO and SiO 2 , MgO, Fe 2 o 3 . At present, a large amount of magnesium reduction slag has not been effectively utilized, and is still discharged and piled up randomly, resulting in waste of resources. The resource treatment and reuse of magnesium reduction slag has become a key link that limits the sustainable development of the magnesium industry. [0003] The production of low-silicon hot metal by blast furnace can bring huge economic benefits to iron and st...

Claims

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Application Information

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IPC IPC(8): C21C7/064
CPCC21C7/0037C21C7/0645
Inventor 吕明张朝晖李航邢相栋李小明
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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