Method for smelting molten iron by using iron ore with high phosphorus and high aluminum oxide

A technology for aluminum oxide and iron ore powder, which is applied in the field of smelting molten iron with high-phosphorus iron ore powder and high-aluminum oxide-containing iron ore powder, can solve the problem that the mineral composition of high-phosphorus iron ore is complex, the industrial production application has not been realized, Reduce the processing capacity of the ball mill and other problems to achieve the effect of improving the fluidity of molten iron, the fluidity of slag, and the fluidity of molten iron

Inactive Publication Date: 2013-07-10
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mineral composition of high-phosphorus iron ore is relatively complex, and the embedded particle size of phosphorus minerals is relatively fine. There are the following problems in dephosphorization by mineral processing: ①The dephosphorization rate is low; ②Because the fine grinding reduces the processing capacity of the ball mill, the grinding cost Significantly increased; ②Large iron loss
However, the process of this method is relatively complicated, the investment is high, and the furnace lining is corroded seriously. At present, the long-term and stable industrial production application has not been realized.

Method used

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  • Method for smelting molten iron by using iron ore with high phosphorus and high aluminum oxide
  • Method for smelting molten iron by using iron ore with high phosphorus and high aluminum oxide
  • Method for smelting molten iron by using iron ore with high phosphorus and high aluminum oxide

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Effect test

Embodiment 1

[0034] This embodiment uses high phosphorus, high Al2 o 3 Iron ore powder, using the conventional shaft furnace process to produce molten iron.

[0035] The concrete steps of this embodiment are as follows:

[0036] (1) Iron ore powder pellets:

[0037] High phosphorus, high Al 2 o 3 Iron ore powder is crushed to -3mm by a crusher, then 15% coke powder is added, and it is pressed into a 20-30mm agglomerate by a double roller machine.

[0038] High phosphorus and high Al 2 o 3 In iron ore powder, TFe, FeO, SiO 2 、Al 2 o 3 , CaO, MgO, P, S weight percent: TFe 62.3%; FeO 28.193 SiO 2 5.1%; CaO 0.6%; MgO 0.5%; Al 2 o 3 2.2%; P 0.08%; S 0.027%;

[0039] (2) Burden structure and distribution:

[0040] Mix the prepared mass with coke, limestone, dolomite and add it to the shaft furnace:

[0041] Agglomerate 1538kg Coke 880kg;

[0042] Limestone 256kg; Dolomite 58kg.

[0043] (3) Control operation system

[0044] By adjusting the operating system, the temperature...

Embodiment 2

[0070] The concrete steps of this embodiment are as follows:

[0071] Ⅰ Iron ore powder pelletizing

[0072] Step is with embodiment 1,

[0073] Ⅱ Charge structure and distribution:

[0074] Same as Example 1

[0075] Ⅲ Shaft furnace smelting

[0076] By adjusting the operating system of the shaft furnace, the content of FeO in the slag is controlled at 5.1%, the binary basicity of the slag is controlled at 0.8, the sulfur content in the molten iron is controlled at 0.26%, the Si content in the molten iron is 0.12%, and the temperature of the molten iron is controlled at 1430°C. The phosphorus content of molten iron is controlled below 0.1%.

[0077] Ⅳ tapping

[0078] After smelting in the shaft furnace, the phosphorus content in the slag is 0.21%, and more than 51% of the phosphorus brought in by the raw materials enters the slag.

[0079] Ⅴ Slagging

[0080] Al in slag 2 o 3 The content is quite high at 23.6%, but the slag has better fluidity. For the convenience...

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Abstract

The invention relates to a method for smelting molten iron by using iron ore with high phosphorus and high aluminum oxide. The method comprises the following steps in sequence: I, preparing the block masses from the iron ore; II, distributing the material; III, smelting; and IV, tapping. The method is characterized in that material distribution in the step II comprises the following substeps: mixing the prepared block masses with coke, limestone and dolomite, and then adding to an iron-making furnace; the smelting in the step III is to control the pre-reducing degree of the iron ore block masses, change the reducing atmosphere of a shaft furnace, control the content of FeO in slag within 2.5%-8%, control the binary basicity within 0.8-1.0, control the content of sulfur in the molten iron within 0.05%-0.3%, control the temperature of the molten iron to be 1450 DEG C or below 1450 DEG C, and control the content of the molten iron Si to be 0.2% or less than 0.2%. According to the method for smelting the molten iron disclosed by the invention, the production cost of the molten iron is low, the production process is simple, and the contents of Si and the phosphorus in molten iron are low.

Description

technical field [0001] The invention relates to a method for smelting molten iron with high-phosphorus iron ore powder and high-aluminum oxide iron ore powder, specifically a method for smelting molten iron with high-phosphorus iron ore powder and high-aluminum oxide iron ore powder. Among them, the phosphorus content in high-phosphorus iron ore powder is ≤0.3%, and the aluminum oxide is ≤3%. Background technique [0002] In recent years, with the continuous high-speed growth of the iron and steel industry, the demand for iron ore is increasing, and the quality of iron ore is also put forward higher requirements. The current blast furnace smelting process requires high-grade iron for the incoming raw materials, and SiO 2 、Al 2 o 3 The content of phosphorus and sulfur impurities should be low. Because of high iron grade, SiO 2 When the content is low, it is beneficial to improve the utilization factor of the blast furnace and produce more molten iron; if the furnace char...

Claims

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Application Information

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IPC IPC(8): C21B11/02
Inventor 张华范建军蔡湄夏贺淑珍赵建伟史永林
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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