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Slagging process for removing free calcium oxide fCao from converter slag

A technology of free calcium oxide and converter steel slag, used in the manufacture of converters and other directions, can solve the problems of inability to recycle, limit, and large losses.

Inactive Publication Date: 2010-02-03
王虎
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The research on the composition of steel slag shows that ("Research on mineral composition, petrographic characteristics and expansion of low-alkalinity steel slag" "Journal of Southwest Institute of Technology" 1997 Vol.12.No, 1), the basicity of open hearth slag and electric furnace slag is R1.6-2.3 It belongs to the dicalcium silicate slag series. Regardless of whether the old slag or new slag has been tested for many years, the f-CaO is in the range of 0-0.5%. It can be used directly without pretreatment, and the basicity of converter steel slag R > 2.4 belongs to silicic acid. The three-calcium slag system contains high free calcium oxide and its utilization is limited
As of 2008, the utilization rate of steel slag in my country was less than 20%.
At the same time, oxygen blowing oxidizes the metallic iron in the converter slag, which cannot be recycled, resulting in a large loss

Method used

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  • Slagging process for removing free calcium oxide fCao from converter slag
  • Slagging process for removing free calcium oxide fCao from converter slag
  • Slagging process for removing free calcium oxide fCao from converter slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022]Reserved capacity of converter: 120t. Smelting steel grade X60 pipeline steel. Primary refining composition requirements: C≤0.05%, Si≤0.10%, Mn0.8-1.0%, P≤0.010%, S≤0.012%. According to the conventional smelting process, first add 106 tons of molten iron and 18.3 tons of scrap steel to the furnace, and then ignite it for about 1 minute, then add 4365 kg of lime (about 87.5% of the original lime consumption) and 1825 kg of light-burned magnesium balls into the furnace, and then lower the gun. After blowing oxygen for 11 minutes, add 600kg of quartz sand (approximately 12% of the raw lime content), and continue blowing for 3 minutes and 37 seconds to lift the gun, pour the furnace, measure temperature, take samples, pour slag, and tap the steel. The furnace tapped 116 tons of steel.

[0023] The composition and temperature of molten iron in this furnace are:

[0024] [Si%] [P%] [Mn%] [S%] Temperature

[0025] 0.52 0.101 0.36 0.012 1316°C

[0026] The composition and t...

Embodiment 2

[0031] Reserved capacity of converter: 120t. Smelting steel type: Q235B. Primary refining composition requirements: C≤0.05%, Si≤0.03%, Mn0.25-0.35%, P≤0.015%, S≤0.015%. According to the conventional smelting process, first add 110 tons of molten iron and 20.3 tons of scrap steel to the furnace, blow oxygen to ignite for about 1 minute, raise the gun, add 4456 kg of lime (about 87.5% of the original lime consumption) and 1903 kg of lightly burned magnesium balls into the furnace, and lower the gun After blowing oxygen for 10 minutes, add 600kg of quartz sand (about 11.7% of raw lime content) to continue blowing for 4 minutes and 35 seconds, then lift the gun, turn down the furnace, measure temperature, take samples, pour slag, and tap the steel. The furnace tapping is 118 tons.

[0032] The composition and temperature of molten iron in this furnace are:

[0033] [Si%] [P%] [Mn%] [S%] Temperature

[0034] 0.59 0.102 0.48 0.013 1299°C

[0035] The composition and temperature...

Embodiment 3

[0040] Reserved capacity of converter: 120t. Smelting steel Q235B. Primary refining composition requirements: C≤0.05%, Si≤0.03%, Mn0.25-0.35%, P≤0.015%, S≤0.015%. According to the conventional smelting process, first add 116 tons of molten iron and 19.8 tons of scrap steel into the furnace, and then raise the gun for about 1 minute to ignite. After blowing oxygen for about 12 minutes, add 1136 tons of wollastonite (about 20% of the raw lime content) and continue blowing for 4 minutes and 7 seconds before ending. The steel output of this furnace is 119.5 tons.

[0041] The composition and temperature of molten iron in this furnace are:

[0042] [i%] [P%] [Mn%] [S%] Temperature

[0043] 0.63 0.102 0.52 0.014 1340°C

[0044] The composition and temperature of molten steel at the end of the furnace are:

[0045] [C%] [P%] [Mn%] [S%] Temperature

[0046] 0.06 0.010 0.099 0.013 1670°C

[0047] Slag basicity R=2.46 f-CaO=1.1%.

[0048] Table 2 Alkalinity R and f-CaO content ...

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Abstract

The invention discloses a slagging process for removing free calcium oxide fCao from converter slag, which is characterized in that the smelting process of a common converter is not changed much, thechange of the process is in the latter half period of blowing, and SiO2 material or calcium silicate material is used for replacing a part of lime in the original process for slagging and melting. Theprocess has low cost and no addition of slag amount, decreases the slag basicity, improves the fluidity, greatly enhances the dephosphorization capacity and sufficiently reduces the content of fCao in the slag.

Description

technical field [0001] The invention relates to a slagging process for converter blowing, in particular to a slagging process for dissolving steel slag free calcium oxide (f-CaO) in a converter. Background technique [0002] Converter slag is a by-product of converter steelmaking, and its occurrence is about 10-15% per ton of steel. According to my country's 2008 steel output of about 500 million tons, the annual steel slag is 50-75 million tons, most of which are converter steel slag. The research on the composition of steel slag shows that ("Research on mineral composition, petrographic characteristics and expansion of low-alkalinity steel slag" "Journal of Southwest Institute of Technology" 1997 Vol.12.No, 1), the basicity of open hearth slag and electric furnace slag is R1.6-2.3 It belongs to the dicalcium silicate slag series. Regardless of whether the old slag or new slag has been tested for many years, the f-CaO is in the range of 0-0.5%. It can be used directly with...

Claims

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Application Information

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IPC IPC(8): C21C5/36
Inventor 王虎
Owner 王虎
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