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Method for producing low-phosphorous molten iron by high-phosphorous reduced iron

A technology for reducing iron and molten iron, which is applied in the field of smelting, can solve problems such as the contradiction between supply and demand of iron ore resources, and achieve the effects of low cost, cost reduction, and environmental pollution reduction

Inactive Publication Date: 2010-02-10
KUNMING IRON & STEEL HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a process for producing low-phosphorus molten iron with high-phosphorus reduced iron, in order to develop and utilize low-grade high-phosphorus iron ore resources, and solve the current problem of contradiction between supply and demand of iron ore resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The raw material is direct reduced iron obtained from low-grade high-phosphorus ore through direct reduction process. The chemical composition of the raw material is: TFe72.30%, MFe56.80%, P1.42%, S0.05%, C2.32% and SiO 2 10.76%, Fe 2 o 3 : 22.14%, AL 2 o 3 : 1.32%, CaO: 2.89%, MgO: 0.35%, MnO: 1.84%, K 2 O: 0.11%. Through the following process steps:

[0039] A. At a temperature of 1420°C, add 100kg of reduced iron and 10kg of CaO into an intermediate frequency induction furnace, melt until molten iron and slag are separated, and obtain molten iron with a phosphorus content of 1.23%, and the following main components Slag: CaO19.80%, SiO 2 27.23%, FeO19.29% and P1.105%, and remove the slag;

[0040] B. Leave 100kg of molten iron in the furnace, and add 10kg of dephosphorization agent to it, wherein the composition of the dephosphorization agent is: 40% CaO, 8% SiO 2 , 10% FeO, 30% Fe 2 o 3 , 8%Al 2 o 3 and 4% CaF 2 ;

[0041] C. Carry out the first depho...

Embodiment 2

[0046] The raw material is direct reduced iron obtained from low-grade high-phosphorus ore through direct reduction process. The chemical composition of the raw material is: TFe51.90%, MFe44.7%, P0.91%, S0.07%, C6.32% and SiO 2 30.81%, Fe 2 o 3 : 10.28%, AL 2 o 3 : 1.05%, CaO: 2.56%, MgO: 0.35%, MnO: 2.84%, K 2 O: 0.11%. Through the following process steps:

[0047] A. At a temperature of 1550°C, add 200kg of reduced iron and 30kg of CaO into an intermediate frequency induction furnace, melt until molten iron and slag are separated, and obtain molten iron with a phosphorus content of 1.23%, and the following main components Slag: CaO25.65%, SiO 2 35.71%, FeO19.29% and P1.105%, and remove the slag;

[0048] B. Leave 100kg of molten iron in the furnace, and add 7kg of dephosphorization agent to it, wherein the composition of the dephosphorization agent is: 49% CaO, 5% SiO 2 , 18% FeO, 20% Fe 2 o 3 , 5% Al 2 o 3 and 3% CaF 2 .

[0049] C. Carry out the first dephos...

Embodiment 3

[0053] The raw material is direct reduced iron obtained from low-grade high-phosphorus ore through direct reduction process. The chemical composition of the raw material is: TFe50.75%, MFe42.13%, P1.30%, S0.24%, C5.32% and SiO 2 31.75%, Fe 2 o 3 : 12.31%, AL 2 o 3 : 1.04%, CaO: 2.57%, MgO: 0.35%, MnO: 2.81%, K 2 O: 0.13%. Through the following process steps:

[0054] A. At a temperature of 1470°C, add 200kg of reduced iron and 16kg of CaO into an intermediate frequency induction furnace, melt until molten iron and slag are separated, and obtain molten iron with a phosphorus content of 1.35%, and the following main components Slag: CaO14.75%, SiO 2 35.94%, FeO17.26% and P1.23%, and remove the slag;

[0055] B. Leave 100kg of molten iron in the furnace, and add 8kg of dephosphorization agent to it, wherein the composition of the dephosphorization agent is: 30% CaO, 5% SiO 2 , 15% FeO, 40% Fe 2 o 3 , 5% Al 2 o 3 and 5% CaF 2 ;

[0056] C. Carry out the first dephos...

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Abstract

The invention provides a method for producing low-phosphorous molten iron by high-phosphorous reduced iron, which takes the high-phosphorous reduced iron as raw material. The method comprises: addingCaO into the high-phosphorous reduced iron, and melting and separating the CaO and the high-phosphorous reduced iron in a melting furnace at the temperature of 1400-1550 DEG C; adding dephosphorizingagents with the mass ratio into the molten iron: 30-50% of CaO, 0-10% of SiO2, 0-20% of FeO, 20-40% of Fe2O3, 5-12% of Al2O3 and 3-10% of CaF2; dephosphorizing 1-3 times at the temperature of 1300-1450 DEG C, and producing the molten iron with different phosphorus content, such as low-phosphorous and ultra-low-phosphorous high quality molten iron; therefore, the method lightens the metallurgical load of a steel refining furnace, reduces the quantity of slag, effectively develops and utilizes low grade high-phosphorous iron ore resource, and solves the problem of contradictory supply and demandof the iron ore resource at present.

Description

technical field [0001] The invention relates to a method for producing low-phosphorus molten iron by using high-phosphorus reduced iron, which belongs to the technical field of smelting. Background technique [0002] In recent years, as the price of imported high-quality iron ore continues to rise, the contradiction of the shortage of raw materials for the production of my country's iron and steel industry has become increasingly prominent, thus restricting the healthy development of my country's iron and steel industry. The development and utilization of low-grade high-phosphorus iron ore resources with abundant domestic reserves is a good supplement to ensure the supply of iron ore resources in my country, and is one of the important ways to alleviate the contradiction between supply and demand of iron ore resources in my country. Low-grade high-phosphorus iron ore can produce low-grade high-phosphorus reduced iron with a phosphorus content greater than 1.4% through a dire...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/02C21C7/064
CPCY02P10/20
Inventor 张竹明徐楚韶罗明发叶亚雄陈登福栗伟孙善长雷云郑福生唐美锡张洪彪张大江
Owner KUNMING IRON & STEEL HLDG CO LTD
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