Dephosphorizing slag pressing agent and method thereof for inhibiting steel slag bubbles

A technology of slag pressing agent and dephosphorization, which is applied in the manufacture of converters, etc., can solve the problems affecting the dephosphorization cycle, etc., and achieve the effects of improving the life of the furnace lining, lowering the cost, and reducing consumption

Active Publication Date: 2017-05-31
SHOUGANG JINGTANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a dephosphorization slag pressing agent and a method for suppressing steel slag bubbles, which solves the technical problem in the prior art that the slag must be poured before the dephosphorization converter is tapped, thereby affecting the dephosphorization cycle

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The slag pressing agent used in this embodiment comprises the following components according to mass percentage: SiO 2 : 50.3%, Al 2 o 3 : 27.6%, Fe 2 o 3 : 1.8%, CaO: 0.63%, MgO: 2.56%, TiO 2 : 1.1%, C: 12.5%, whole water 3.51%. The mass percentage of the volatile matter of the combustible base is 12%; the average particle size of the slag pressing agent is 10mm.

[0042] Semi-steel is smelted; the weight of scrap steel into the furnace is 25.85 tons, the weight of molten iron is 295.2 tons, the content of C in molten iron is 4.33%, the content of Si is 0.26%, the content of S is 0.001%, the content of P is 0.0893%, the content of Mn is 0.0201%, and the temperature of molten iron is 1344°C.

[0043] Operation scheme: 3 tons of slag left in this furnace, 3.01 tons of lime, 1.02 tons of light sintering, 0.92 tons of sinter, 7.12 tons of cold solidified pellets, and 0.502 tons of slag agent. After the converter oxygen lance is lifted, 365 kg of the slag pressing age...

Embodiment 2

[0046] The slag pressing agent used in this embodiment comprises the following components according to mass percentage: SiO 2 : 54.1%, Al 2 o 3 : 25%, Fe 2 o 3 : 3.0%, CaO: 0.5%, MgO: 2.5%, TiO 2 : 1.02%, C: 10.03%, whole water 3.85%. The mass percentage of the volatile matter of the combustible base is 10%; the average particle size of the slag pressing agent is 20mm.

[0047] Smelting semi-steel: the weight of scrap steel into the furnace is 26.17 tons, the weight of molten iron is 296.19 tons, the content of C in molten iron is 4.37%, the content of Si is 0.49%, the content of P is 0.096%, the content of Mn is 0.16%, the content of S is 0.001%, and the content of molten iron is The temperature is 1342°C.

[0048] Operation plan: 3 tons of slag left in this furnace, 5.83 tons of lime, 0.71 tons of light burning, 16.69 tons of cold solidified pellets, and 1.32 tons of sinter. After the converter oxygen lance is lifted, 671 kg of the slag pressing agent is added, and th...

Embodiment 3

[0051] The slag pressing agent used in this embodiment comprises the following components according to mass percentage: SiO 2 : 45%, Al 2 o 3 : 30%, Fe 2 o 3 : 1.5%, CaO: 1.0%, MgO: 4.5%, TiO 2 : 0.7%, C: 15%, total water 2.3%. The mass percentage of the volatile matter of the combustible base is 15%; the average particle size of the slag pressing agent is 30mm.

[0052] Semi-steel is smelted; the weight of scrap steel into the furnace is 26.01 tons, the weight of molten iron is 295.5 tons, the content of C in molten iron is 4.32%, the content of Si is 0.13%, the content of S is 0.001%, the content of P is 0.0101%, the content of Mn is 0.0201%, and the temperature of molten iron is 1335°C.

[0053] Operation plan: 3 tons of slag left in this furnace, 2.21 tons of lime, 0.91 tons of light sintering, 0.92 tons of sinter, 2.12 tons of cold solidified pellets, and 0.604 tons of slag agent. After the converter oxygen lance is lifted, 312 kg of the slag pressing agent is added...

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Abstract

The invention discloses a dephosphorizing slag pressing agent and method thereof for inhibiting steel slag bubble, and belongs to the technical field of steel-making. The dephosphorizing slag pressing agent comprises the following components in mass percent: 45-55% of SiO2, 25-30% of Al2O3, 1.5-3.0% of Fe2O3, 0.5-1.0% of CaO, 2.5-4.5% of MgO, 0.7-1.1% of TiO2, 10-15% of C, less than 5% of total moisture. The slag pressing agent is added after the dephosphorizing blowing is finished, thereby effectively inhibiting the production of the steel slag bubble; the direct tapping can be realized without performing fore-deslagging in dephosphorizing smelting, the smelting period is greatly shortened, the steel and iron consumption can be effectively lowered at the same time, the lining life of a converter is improved, the production target of low cost, high efficiency, energy-conservation and environmental protection of the semi-steel smelting through a dephosphorizing furnace is realized, the environment cannot be influenced, and the chemical component and temperature requirements of the semi-steel are achieved.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a dephosphorization slag pressing agent and a method for suppressing steel slag bubbles. Background technique [0002] As iron ore resources are becoming less and less, especially low-phosphorus iron ore resources are scarce, the quality of iron ore is gradually declining. At the same time, steel product users have continuously improved product quality requirements. The production process can meet the requirements of smelting high value-added varieties of steel. "Full three removal" molten iron refers to the molten iron after desulfurization, dephosphorization and desiliconization. The dephosphorization process of the original molten iron is mainly carried out in the mixed iron car and the molten iron tank. Since the beginning of the 20th century, Nippon Steel has tested special converters in Nagoya Works, Sumitomo in Kashima Works, and Kawasaki Steel in Mizushima Steel Wor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064C21C5/36
CPCC21C5/36C21C7/0087C21C7/0645
Inventor 闫占辉张丙龙张新国白艳江裴培郭小龙
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD
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