Vacuum treatment method of molten steel dephosphorization
A technology for vacuum treatment and molten steel, applied in the field of vacuum refining, can solve the problems such as difficulty in independent regulation of oxygen/powder material flow ratio, large loss of processing time or molten steel temperature, inability to use cheap bulk raw materials, etc. Wide range of addition rates and reduced phosphorus content
Inactive Publication Date: 2004-11-17
武钢集团有限公司
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Problems solved by technology
Since the powder and oxygen share a spray gun, there are the following disadvantages in deep dephosphorization of molten steel: at the same time, oxygen is used as the transport gas to spray powder to the molten pool in the vacuum chamber, and the material flow ratio of oxygen / powder is difficult to control independently; Before reaching the molten steel pool in the vacuum chamber, it is discharged by the vacuum pump, and the utilization rate of the powder is reduced; the dephosphorization rate during the powder spraying process is limited by the capacity of the powder spray tank, and the processing time or molten steel temperature is greatly lost; cheap block raw materials cannot be used, and the powder cost is high
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Embodiment 1
[0025] Example 1: In figure 1 The shown RH vacuum degassing device uses the method of the present invention to process 4 furnaces of weakly deoxidized steel and 2 furnaces of aluminum and silicon killed steel. Since the amount of flux added depends on the initial phosphorus content of the molten steel, the target phosphorus content and the processing time, Technologies such as oxygen and flux are given in the following process conditions
[0026] Range of parameters:
[0027] The block flux is composed of 60% active lime and 40% fluorite;
[0028] The powder is composed of 70% active lime and 30% fluorite;
[0029] Adding rate 100~120kg / min;
[0030] Oxygen injection volume 0.06~0.260Nm per kg flux 3 oxygen;
[0031] Addition of flux 2~5kg flux per ton of molten steel;
[0032] Spray gun position 2~4m above the bottom of the vacuum chamber;
[0033] Ladle slag composition (mass%) (CaO / SiO 2 ) / Al 2 O 3 Greater than 0.2;
[0034] Ladle slag composition (mass%) CaF 2 The content is ...
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Abstract
A vacuum treatment method for dephosphorizing molten steel to produce low-phosphorus (or ultralow-phosphorus) weakly-deoxidized steel or other steel features that in the vacuum carbon-oxygen reaction phase, the oxygen or iron oxide needed by dephosphorizing reaction is added to the molten steel pool in a vacuum chamber while the lime blocks or powder is added for quickly dephosphorizing, and this method can also prevent rephosphorization from the steel ladle slag.
Description
Technical field [0001] The invention relates to a vacuum treatment method for molten steel dephosphorization, in particular to a method for removing phosphorus in molten steel by adding a dephosphorization substance under vacuum reduced pressure degassing conditions, and belongs to the technical field of vacuum refining. Background technique [0002] The method of oxidative dephosphorization of molten steel is generally completed before the molten steel reaches the vacuum degassing treatment. In the patent document International Publication Number: WO 00 / 68442. Method of decarburization and dephosphorisation of a molten metal. 16 November 2000, "a The method of decarburization and dephosphorization of molten metal", this method uses a spray gun installed on the top to spray oxygen and powder to the surface of molten steel in the vacuum degassing chamber for dephosphorization in a vacuum degassing device. Because the powder and oxygen share a spray gun, the deep dephosphorization ...
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IPC IPC(8): C21C7/064C21C7/10
Inventor 李凤喜彭玮珂区铁林利平田义胜曹维邵继新
Owner 武钢集团有限公司