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Process for smelting molten steel with high phosphorus iron ore as raw material

A high-phosphorus iron ore and molten steel technology, which is applied in the field of iron and steel smelting, can solve the problems that are difficult to realize, short slag-gold separation time, high-phosphorus iron ore cannot be applied, etc., achieve high-efficiency separation, broad industrial application prospects, and equipment industry implementation easy effect

Active Publication Date: 2022-01-11
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to achieve such a short slag-gold separation time on an industrial scale. Therefore, high-phosphorus iron ore has not been applied in the iron and steel industry so far.

Method used

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  • Process for smelting molten steel with high phosphorus iron ore as raw material
  • Process for smelting molten steel with high phosphorus iron ore as raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1 (first furnace)

[0027] 1) Add carbon powder and lime to the high phosphorus iron ore, adjust the C / O molar ratio in the high phosphorus iron ore to be 1.2, and the binary basicity R is 1.1, mix well, and then add the weight of the high phosphorus iron ore 0.8% binder and appropriate amount of water are pressed into pellets;

[0028] 2) Place the agglomerate made in step 1) in the electric furnace I, heat up to 1550° C., and after reducing the molten steel, pour the slag to remove the liquid slag;

[0029] 3) Oxygen was blown with an oxygen lance in the induction furnace I. The distance between the oxygen lance and the molten steel surface was about 200mm-250mm in the two tests, soft oxygen blowing for 8 minutes, and weak argon blowing at the bottom for stirring. Add simultaneously the slagging agent that accounts for 18% of high-phosphorus iron ore quality, pour out liquid metal to electric furnace II, simultaneously pour out slag composition control as ...

Embodiment 2

[0032] Embodiment 2 (second furnace)

[0033] 1) Add carbon powder and lime to the high phosphorus iron ore, adjust the C / O molar ratio in the high phosphorus iron ore to be 1.4, and the binary basicity R is 1.3, mix well, and then add the weight of the high phosphorus iron ore 0.6% binder and appropriate amount of water to make agglomerates;

[0034] 2) Place the pellets made in step 1) in the electric furnace I, heat up to 1600° C., and after reducing the molten steel, deslag is carried out to remove the liquid slag;

[0035] 3) Oxygen was blown with an oxygen lance in the induction furnace I. In the two tests, the distance between the oxygen lance and the molten steel surface was about 200mm-250mm, and the oxygen was blown softly for 10 minutes, and the argon was blown weakly at the bottom and stirred. Add simultaneously the lime slagging agent that accounts for 18% of high-phosphorus iron ore quality, pour out liquid metal to electric furnace II, simultaneously pour out s...

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Abstract

The invention relates to the technical field of metal smelting, and discloses a process for smelting molten steel using high-phosphorus iron ore as a raw material. In the present invention, the high-phosphorus iron ore is directly used as a raw material for steelmaking, the reduction melting and dephosphorization are completed in one electric furnace, and the decarburization task is completed in another electric furnace, so as to finally obtain qualified molten steel. The equipment industry involved in this process is easy to implement, and the system scientifically couples various key unit technologies to achieve efficient separation of Fe / P, and has broad industrial application prospects.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a process for smelting molten steel using high-phosphorus iron ore as a raw material. Background technique [0002] High-phosphorus iron ore is a characteristic resource in my country, with a total reserve of about 10 billion tons. With the traditional blast furnace ironmaking method, almost all the P in the ore enters the molten iron, and the P content in the molten iron is as high as 1%. Because the converter steelmaking method is difficult to smelt molten iron with such a high P content, the high-phosphorus iron ore with huge reserves in my country is still a "dull ore". Therefore, the development of high-phosphorus iron ore smelting technology is of great significance to the development of my country's iron and steel industry and even the national resource security. [0003] For the comprehensive utilization of high phosphorus rock, predecessors have done a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/52C21C7/068C22B1/24
CPCC21C5/52C21C7/068C22B1/2406Y02P10/20
Inventor 张延玲张威风赵峥余阚
Owner UNIV OF SCI & TECH BEIJING