Converter dephosphorization method for high-phosphorus low-silicon molten iron

A molten iron and high phosphorus technology, applied in the direction of manufacturing converters and improving process efficiency, can solve the problems of increasing the stirring time of molten iron, affecting production, and insufficient latent heat of molten iron, so as to reduce the consumption of auxiliary materials in converters and reduce iron making. Cost, dephosphorization effect is remarkable

Inactive Publication Date: 2015-09-02
HBIS COMPANY LIMITED HANDAN BRANCH COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for high-phosphorus and low-silicon molten iron, especially low-temperature molten iron, due to insufficient latent heat of molten iron, difficulty in slagging in the early stage, high alkalinity, and small amount of slag, the use of these processes is not conducive to dephosphorization, and may even cause sticking to the gun and flue. and other accidents seriously affect the smooth flow of production
Chinese patent application number 201410470076.0 discloses "a dephosphorization method for pro

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The amount of slag left in the converter is 20kg / t of steel, the amount of molten iron mixed into the converter is 280.2t, 20.4t of scrap steel is loaded, and 30kg / t of steel refining white slag is loaded with the scrap steel. The weight percentages of molten iron components are: Si: 0.16%, P: 0.137%, T=1288°C. The composition of the refined white slag is shown in the composition of the 1# sample in Table 1. After blowing starts, lower the gun position until the penetration depth ratio is 0.58, and the oxygen supply intensity is 3.5Nm 3 / min.t. After the ignition is successful, add 17.5kg / t steel lime, 15kg / t steel dolomite, and 4kg / t steel sintering return ore. After adding the first batch of slag-making materials, raise the gun position to a penetration depth ratio of 0.52, blow to foamy slag, and add 6kg / t of steel lime. After the foam slag is stable, lower the gun position to a penetration depth ratio of 0.54. During the blowing process, according to the tempera...

Embodiment 2

[0039] The amount of slag left in the converter is 44kg / t of steel, the amount of molten iron mixed into the converter is 280.7t, 20.4t of scrap steel is loaded, and 20kg / t of steel refining white slag is added with the scrap steel. The weight percentages of molten iron components are: Si: 0.14%, P: 0.160%, T=1332°C. The composition of refined white slag is shown in Table 1, 2# sample composition. After blowing starts, lower the gun position until the penetration depth ratio is 0.56, and the oxygen supply intensity is 3.5Nm 3 / min.t. After the ignition is successful, add 16kg / t steel lime, 12kg / t steel dolomite, and 15kg / t steel sintering return ore. After adding the first batch of slag-making materials, raise the gun position to a penetration depth ratio of 0.52, blow to foamy slag, and add 6kg / t of steel lime. After the foam slag is stable, lower the gun position to a penetration depth ratio of 0.53. During the blowing process, according to the temperature of molten stee...

Embodiment 3

[0041] The amount of slag left in the converter is 60kg / t of steel, the amount of molten iron mixed into the converter is 280.1t, 20.3t of scrap steel is loaded, and 10kg / t of steel refining white slag is added with the scrap steel. The weight percentages of molten iron components are: Si: 0.18%, P: 0.181%, T=1396°C. The composition of refined white slag is shown in Table 1, 3# sample composition. After the blowing starts, lower the gun position to a penetration depth ratio of 0.55, and the oxygen supply intensity is 3.5Nm 3 / min.t. After the ignition is successful, add 16kg / t steel lime, 12kg / t steel dolomite, and 25kg / t steel sintering return ore. After adding the first batch of slag-making materials, raise the gun position to a penetration depth ratio of 0.51, blow to foamy slag, and add 6kg / t of steel lime. After the foam slag is stable, lower the gun position to a penetration depth ratio of 0.53. During the blowing process, according to the temperature of the molten s...

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PUM

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Abstract

The invention discloses a converter dephosphorization method for high-phosphorus low-silicon molten iron, and belongs to the technical field of steel-making process control. According to the converter dephosphorization method, a smelting process combining partial remained final slag and refined white slag added in the earlier stage is adopted, the final slag remaining amount is that 20-60 kg of final slag is remained in per ton of steel, and the refined white slag adding amount is that 10-30 kg of refined white slag is added into per ton of steel; in addition, the adding amount and the adding time of slagging materials are controlled, and the oxygen supply intensity and the gun position during the smelting process are adjusted, so that the dephosphorization rate of high-phosphorus molten iron smelting reaches 90% or above, and the converter end phosphorus content can be controlled within 0.015% stably; through the full utilization of the pre-melting feature of the refined white slag and the characteristic that the refined white slag contains more Al2O3 and certain CaF2, the slag melting point is reduced, the slag fluidity is improved, and the dynamic conditions for dephosphorization are improved; through the full utilization of the characteristic that the refined white slag has higher alkalinity, high-alkalinity slag can be formed earlier, and the thermodynamic conditions for dephosphorization are improved; as the refined white slag can be recycled, the converter steel-making cost can be effectively reduced.

Description

technical field [0001] The invention relates to a converter dephosphorization method for high-phosphorus and low-silicon molten iron, belonging to the technical field of steelmaking process control. Background technique [0002] The iron and steel market continues to slump, and many iron and steel enterprises have turned their attention to low-priced high-phosphorus ore in order to reduce production costs; the increasing scarcity of iron ore resources has also made the smelting of low-grade, high-phosphorus ore a problem that iron and steel enterprises must face . As the proportion of high-phosphorus ore smelting increases, the proportion of high-phosphorus molten iron in steelmaking converters continues to increase; therefore, how to quickly remove phosphorus from high-phosphorus molten iron to the specified range of qualified molten steel under low-cost conditions has become Many metallurgists research key topics. [0003] At present, the converter dephosphorization meth...

Claims

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Application Information

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IPC IPC(8): C21C5/28C21C5/30
CPCY02P10/20
Inventor 邓建军高福彬唐文明孙玉虎李建文侯钢铁赵海峰范佳刘红艳巩艳坤
Owner HBIS COMPANY LIMITED HANDAN BRANCH COMPANY
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