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Dephosphorizing agent and application thereof

A technology of dephosphorization agent and phosphorus content, applied in the field of dephosphorization agent, can solve the problems of poor dephosphorization kinetic conditions, limited use range of phosphorus content, low lime dissolution efficiency, etc., to expand the available range, improve smelting efficiency, The effect of increasing phosphorus capacity

Pending Publication Date: 2022-06-24
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of converter steelmaking, the phosphorus load is too high. On the one hand, it will bring a series of problems such as long smelting cycle, large amount of slag, high emission, high energy consumption, and large iron loss; on the other hand, since converter steelmaking has no external heat source, From the perspective of heat, the molten iron [P] entering the converter is not allowed to be too high, and it is usually required that the molten iron [P]<0.15%, which greatly limits the iron ore resources with high phosphorus content (such as high-phosphorus iron ore with Chinese characteristics). scope of use
[0003] Most of the traditional pre-dephosphorization of molten iron only uses lime and iron oxide scale (or oxygen as the gas oxygen source) as dephosphorization agents. Under such conditions, the dissolution efficiency of lime is low, the fluidity of slag is poor, and the kinetic conditions of dephosphorization are harsh. Therefore, the efficiency of pre-dephosphorization very low

Method used

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  • Dephosphorizing agent and application thereof
  • Dephosphorizing agent and application thereof
  • Dephosphorizing agent and application thereof

Examples

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preparation example Construction

[0030] The present invention has no special requirements for the preparation method of the dephosphorization agent. The corresponding raw materials are directly prepared according to the mass ratio of the metal oxides in the dephosphorization agent, and then crushed and mixed to prepare the spray powder, pellets or pressed powders. block, the specific preparation flow chart is as follows figure 1 shown.

[0031] When the dephosphorizing agent is spray powder, the particle size of the spray powder is preferably 0.5 mm to 2 mm; when the dephosphorizing agent is pellets or briquette, the particle size of the pellet or briquette is preferably 10 mm ~20mm.

[0032] In the present invention, if a certain material can provide Fe at the same time 2 O 3 and Al 2 O 3 , such as FeAl containing 2 O 4 materials, when converting raw materials, FeAl 2 O 4 Converted to Fe at the same time 2 O 3 and Al 2 O 3 .

[0033] The present invention provides the application of the dephosp...

Embodiment 1

[0038] The raw materials such as quicklime, bauxite, baking soda and rolled steel skin are taken, fully mixed and ground to prepare a briquette with a particle size of 15mm. Among them, Fe in the dephosphorization agent according to the mass ratio 2 O 3 : CaO is 4.1:1, mass ratio CaO:Al 2 O 3 8.5:1, mass ratio Al 2 O 3 : Na 2 O is 5.1:1.

[0039] Table 1 Example 1 Main components of each raw material (wt%)

[0040]

[0041]

[0042] Take 2.20Kg of pig iron blocks with an initial [C] content of 4.3 wt% and a [P] content of 0.23 wt% for dephosphorization test, control the temperature to 1410 °C, add 150 g of dephosphorization agent to the furnace respectively, and carry out dephosphorization for 10 min. [P] 0.060 wt%, [C] 3.2 wt% molten iron. The dephosphorization rate was 73.9%.

Embodiment 2

[0044] The raw materials limestone, bauxite, baking soda and iron-containing tailings are taken, fully mixed and finely ground to prepare a powder with a particle size of 1 mm. Among them, in the dephosphorization agent according to the mass ratio of Fe 2 O 3 : CaO is 2.3:1, mass ratio CaO:Al 2 O 3 8.4:1, mass ratio Al 2 O 3 : Na 2 O is 4.3:1.

[0045] Table 2 The main components of each raw material in Example 2 (wt%)

[0046]

[0047] Take 2.15Kg of pig iron blocks with an initial [C] content of 4.5wt% and a [P] content of 0.24wt% for pre-dephosphorization test, control the temperature to 1410℃, add 148g of dephosphorization agent to the furnace respectively, and carry out dephosphorization for 10min. [P] 0.064 wt%, [C] 4.0 wt% of molten iron was obtained. The dephosphorization rate was 73.3%.

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Abstract

The invention provides a dephosphorizing agent for pre-dephosphorizing medium-high phosphorus molten iron as well as a preparation method and application of the dephosphorizing agent, and belongs to the technical field of metallurgy. The dephosphorizing agent disclosed by the invention is low in slag system melting point, extremely fast in slag forming, good in fluidity, high in phosphorus capacity and high in dephosphorizing efficiency. The dephosphorizing agent can achieve a dephosphorizing rate of 70% or more in a short time from molten iron storage and transportation to a converter process. After the dephosphorizing agent is used for pre-dephosphorizing the molten iron, more than 70% of dephosphorization is completed before the molten iron enters a converter, on one hand, the dephosphorizing agent can be suitable for the molten iron with the initial [P] content up to about 0.25%, and compared with an existing blast furnace burden structure, the application proportion of inferior iron ore resources with high phosphorus content in a blast furnace is remarkably increased; on the other hand, the smelting efficiency in the converter steelmaking process is effectively improved, emission of slag and the like is remarkably reduced, and economic benefits and environmental benefits are huge.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a dephosphorization agent and its application. Background technique [0002] Phosphorus is a typical impurity element in molten steel, and dephosphorization is one of the basic operations of the steelmaking process. In the process of converter steelmaking, the phosphorus load is too high. On the one hand, it will bring a series of problems such as long smelting cycle, large slag amount, high emission, high energy consumption, and large iron loss; on the other hand, since there is no external heat source in converter steelmaking, From the point of view of heat, the molten iron [P] entering the converter is not allowed to be too high. Usually, molten iron [P] is required to be less than 0.15%, which greatly limits the iron ore resources with high phosphorus content (such as high-phosphorus iron ore with Chinese characteristics). scope of use. [0003] Traditional hot metal pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064C21C1/02
CPCC21C7/0645C21C1/025Y02P10/20
Inventor 张延玲赵峥黄武胜延黎
Owner UNIV OF SCI & TECH BEIJING
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