Slag former and slagging method for semisteel steelmaking

A slagging agent and slagging technology, applied in the field of steelmaking, can solve the problems of shortening the initial slag formation time and pure oxygen blowing time, slow slagging, and low dephosphorization rate, so as to shorten the initial slag formation time and improve the dephosphorization rate. Phosphorus rate, shortening the effect of pure oxygen blowing time

Inactive Publication Date: 2012-01-04
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention provides a slagging agent for semi-steel making and a slag-making method for semi-steel making. Using the invention can shorten the initial slag formation time and pure oxygen blowing time, and can effectively solve the problem of slag formation during semi-steel smelting Slow and low dephosphorization rate, and improve the dephosphorization efficiency of semi-steel smelting

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Use semi-steel after vanadium extraction to smelt 45# high-quality carbon structural steel, and the content of phosphorus and sulfur in molten steel is required to be lower than 0.025%. Mix 135t of semi-steel into a 120t converter for smelting and use the slagging method of semi-steel making steelmaking according to the second aspect for smelting.

[0036] The composition of the semi-steel in the furnace is: 3.5wt% of C, 0.042wt% of Mn, 0.088wt% of P, 0.015wt% of V, 0.009wt% of S, traces of Si, and the rest of Fe. The semi-steel temperature is 1335°C. 5-hole oxygen lance is used for blowing, and the oxygen supply intensity is 3.1-4.0Nm 3 / t·min. Add all semi-steel and steelmaking slagging agents and the first batch of active lime and high-magnesium lime when blowing is started, wherein the amount of active lime (containing 88wt% CaO) is 20Kg / t 半钢 , the addition of high magnesium lime (containing 45wt% of CaO and 30wt% of MgO) is 10kg / t 半钢 . The amount of slagging a...

Embodiment 2

[0040] The P72LX steel is smelted using the vanadium-extracted semi-steel, and the phosphorus and sulfur content of molten steel are required to be lower than 0.01%. Mix 138t of semi-steel into a 120t converter for smelting and use the slagging method of semi-steel making steelmaking according to the third aspect for smelting.

[0041] The composition of the semi-steel in the furnace is: 3.46wt% of C, 0.038wt% of Mn, 0.076wt% of P, 0.012wt% of V, 0.003wt% of S, traces of Si, and the rest of Fe. The semi-steel temperature is 1328°C. 5-hole oxygen lance is used for blowing, and the oxygen supply intensity is 3.1-4.0Nm 3 / t·min. The slagging material composed of slagging agent for semi-steel making, active lime and high magnesium lime is added to the converter in two batches. Add the first batch of slagging materials at the same time as blowing, wherein the amount of active lime (containing 86wt% CaO) is 35Kg / t 半钢 , the addition of high magnesium lime (containing 55wt% of CaO...

Embodiment 3

[0045] The semi-steel after vanadium extraction is used to smelt 50 high-quality carbon structural steel, and the phosphorus and sulfur content of molten steel are required to be lower than 0.025%. Mix 140t of semi-steel into a 120t converter for smelting and use the slagging method of semi-steel making steelmaking according to the second aspect for smelting.

[0046] The composition of the semi-steel in the furnace is: 3.63wt% of C, 0.048wt% of Mn, 0.068wt% of P, 0.018wt% of V, 0.0010wt% of S, traces of Si, and the rest of Fe. The semi-steel temperature is 1360°C. 5-hole oxygen lance is used for blowing, and the oxygen supply intensity is 3.1-4.0Nm 3 / t·min. Add all semi-steel and steelmaking slagging agents and the first batch of active lime and high-magnesium lime when blowing is started, wherein the amount of active lime (containing 87wt% CaO) is 20Kg / t 半钢 , the addition of high magnesium lime (containing 50wt% of CaO and 40wt% of MgO) is 15kg / t 半钢 . The amount of sla...

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Abstract

The invention provides a slag former and a slagging method for semisteel steelmaking. The slag former comprises 60 to 75 percent of SiO2, 10 to 15 percent of CaO, 1 to 3 percent of MgO, 7 to 15 percent of FeO, 1 to 3 percent of Fe2O3 and a small quantity of inevitable impurities. The slagging method comprises the following steps of: slagging by using the slag former for the semisteel steelmaking,active lime and high-magnesium lime, and controlling the addition opportunity and addition quantity of slagging materials appropriately. By the slag former and the slagging method for the semisteel steelmaking, the problems of low slagging speed and dephosphorization rate during semisteel smelting can be solved, initial slag formation time and pure oxygen blast time can be shortened effectively, and the molten steel dephosphorization rate of a finishing point of a converter can be improved.

Description

technical field [0001] The invention relates to the technical field of steelmaking, more specifically, to a slag-forming agent for semi-steel steelmaking and a slagging method for semi-steel steelmaking. Background technique [0002] When vanadium-titanium-magnetite resources are used for smelting to produce steel, the main raw material for converter steelmaking is semi-steel after vanadium extraction in a dedicated converter. Usually, the molten steel obtained after vanadium-containing molten iron is desulfurized and vanadium-extracted is called semi-steel. In the semi-steel obtained after vanadium-containing molten iron is desulfurized and vanadium is extracted, the mass percentage of carbon is 3.4% to 4.0%, the content of exothermic slagging elements such as silicon and manganese are all traces, and the mass percentage of sulfur is controlled at 0.015% Within, the mass percentage content of phosphorus element is 0.060%-0.080%. Therefore, semi-steel steelmaking has the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/076C21C5/36
CPCY02P10/20
Inventor 陈均曾建华杨森祥陈永梁新腾陈天明李安林冯远超李青春李盛李平凡
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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