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Efficient dephosphorization accelerant for converter steelmaking and preparing method thereof

A technology of converter steelmaking and accelerator, applied in the field of metallurgy, can solve the problems of large increase in dephosphorization cost of converter steelmaking, failure to be effectively used, increased consumption of steel materials, etc., to achieve stable dephosphorization effect and cost savings , The effect of saving production energy consumption

Inactive Publication Date: 2017-09-05
天津瑞利鑫环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The converter dephosphorization process commonly used in China at present is to increase the iron oxide content in the slag by adjusting the position of the converter oxygen lance, and control the iron oxide content at 10-20%. At the same time, increase the proportion of lime added to make the slag The alkalinity reaches above 3.5 to meet the thermodynamic conditions required for low temperature, high alkalinity, and high oxidative dephosphorization, but the disadvantage of this is that a large amount of molten steel is blown and oxidized, and at the same time increases the consumption of steel materials and increases the cost , prolong the dephosphorization time, making the dephosphorization efficiency low
[0005] 2. In domestic reports, calcium ferrite is used as a converter dephosphorization agent. This product is a finished product produced through smelting and processing, and the production cost is very high. Using this product will increase the cost of converter steelmaking dephosphorization. be used effectively

Method used

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  • Efficient dephosphorization accelerant for converter steelmaking and preparing method thereof
  • Efficient dephosphorization accelerant for converter steelmaking and preparing method thereof
  • Efficient dephosphorization accelerant for converter steelmaking and preparing method thereof

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Embodiment 1

[0029] A high-efficiency dephosphorization accelerator suitable for converter steelmaking, the high-efficiency dephosphorization accelerator is composed of the following raw materials by weight percentage:

[0030]

[0031] Moreover, the melting point of the accelerator is 1200°C, the particle size is 10mm, and the strength is greater than 1KN / piece.

[0032] A preparation method suitable for the above-mentioned converter steelmaking high-efficiency dephosphorization accelerator, the method comprising the following steps:

[0033] Step 1, using the converter electrostatic precipitator in the steelmaking plant to collect converter dust;

[0034] Step 2, adding iron oxide scale and barium oxide to the converter dedusting dust collected in step 1, weighing and mixing in proportion;

[0035] Step 3, the materials mixed in step 2 are mixed evenly through a mixer;

[0036] Step 4, the material mixed and milled in step 3 is pressed into an ellipsoidal semi-finished product throu...

Embodiment 2

[0040] A high-efficiency dephosphorization accelerator suitable for converter steelmaking, the high-efficiency dephosphorization accelerator is composed of the following raw materials by weight percentage:

[0041]

[0042] Moreover, the melting point of the accelerator is 1300°C, the particle size is 35mm, and the strength is greater than 1KN / piece.

[0043] A preparation method suitable for the above-mentioned converter steelmaking high-efficiency dephosphorization accelerator, the method comprising the following steps:

[0044] Step 1, using the converter electrostatic precipitator in the steelmaking plant to collect converter dust;

[0045] Step 2, adding iron oxide scale and barium oxide to the converter dedusting dust collected in step 1, weighing and mixing in proportion;

[0046] Step 3, the materials mixed in step 2 are mixed evenly through a mixer;

[0047] Step 4, the material mixed and milled in step 3 is pressed into an ellipsoidal semi-finished product throu...

Embodiment 3

[0051] A high-efficiency dephosphorization accelerator suitable for converter steelmaking, the high-efficiency dephosphorization accelerator is composed of the following raw materials by weight percentage:

[0052]

[0053] Moreover, the melting point of the accelerator is 1400°C, the particle size is 60mm, and the strength is greater than 1KN / piece.

[0054] A preparation method suitable for the above-mentioned converter steelmaking high-efficiency dephosphorization accelerator, the method comprising the following steps:

[0055] Step 1, using the converter electrostatic precipitator in the steelmaking plant to collect converter dust;

[0056] Step 2, adding iron oxide scale and barium oxide to the converter dedusting dust collected in step 1, weighing and mixing in proportion;

[0057] Step 3, the materials mixed in step 2 are mixed evenly through a mixer;

[0058] Step 4, the material mixed and milled in step 3 is pressed into an ellipsoidal semi-finished product throu...

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Abstract

The invention relates to a high-efficiency dephosphorization accelerator suitable for converter steelmaking and its preparation method. The innovation point is that the converter steelmaking dedusting ash is used as the base material, and its high iron oxide components and active calcium oxide components are effectively used. Recycling and recycling of waste resources in steel mills, while introducing active BaO materials, the barium phosphate formed by BaO has stronger thermodynamic stability than calcium phosphate, forming a high oxidizing, high An alkaline dephosphorization accelerator with a low melting point can realize the purpose of supplementing FeO in the converter steelmaking process and forming a stable dephosphorization product, so as to enhance the dephosphorization efficiency and finally achieve high-efficiency dephosphorization. This method can save more than 30% of the cost and dephosphorization The efficiency is about 5‑10% higher than that of traditional dephosphorization agents. At the same time, the product of the present invention effectively protects the environment, saves energy, realizes the high-efficiency utilization of resources in "turning waste into treasure" of solid waste in steelworks, obtains better economic and social benefits, and is suitable for popularization and use.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to converter steelmaking, in particular to a high-efficiency dephosphorization accelerator suitable for converter steelmaking and a preparation method thereof. Background technique [0002] The converter steelmaking process is a high-efficiency oxidation and refining process with fast speed and short cycle, in which dephosphorization treatment is one of the essential processes, because for most steel types, phosphorus is a harmful element. When making iron, almost all the phosphorus in the raw material is reduced to the pig iron. Depending on the phosphorus content of the iron ore, the phosphorus in the pig iron can reach 0.1%-1.0%, and it can be as high as 2.0% in special cases. The same is true in ferroalloys. Contains a considerable amount of phosphorus, which makes steel brittle at low temperatures, that is, the phenomenon of "cold brittleness". Experimental studies have proved...

Claims

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Application Information

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IPC IPC(8): C21C7/064
CPCC21C7/0645
Inventor 帅林
Owner 天津瑞利鑫环保科技有限公司
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