Composite slag for smelting stainless steel with back method at same time of desulfurization dephosphorization

A composite slag and stainless steel technology, applied in the field of composite slag, can solve the problems of difficult dephosphorization and increase the burden of refining outside the furnace, and achieve the effects of increasing productivity, reducing smelting burden, and shortening the smelting cycle

Active Publication Date: 2008-10-29
WUHAN IRON & STEEL ENG TECH GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, because this method is difficult to dephosphorize, it is difficult to remove the phosphorus in the charge, and it is directly brought into the next process VOD furnace for out-of-furnace refining, which increases the burden of out-of-furnace refining

Method used

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Examples

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Embodiment Construction

[0014] The composite slag of the present invention includes the following components and weight ratio: when the CaO content is 1 part, BaO and / or BaCO30.6-1.8 parts, CaF 2 and / or BaCl 2 0.3-0.6 parts, Fe 2 o 3 0.10-0.15 parts.

[0015] The purity requirements of each component are as follows: the content of CaO in the lime is greater than 92%, the content of sulfur is less than 0.025%, and the content of silicon dioxide is less than 1%. Other components require a purity of over 98%.

[0016] Embodiment of the present invention sees the following table:

[0017] serial number

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Abstract

The invention provides composite slag which is used for smelting a stainless steel by using a return method and also used for desulfuration and dephosphorization at the same time. The composite slag comprises the components and proportioning by weight as follows: when the content of CaO is 1 part, BaO and / or BaCO3 is 0.6 to 1.8 parts, CaF2 and / or BaCl2 is 0.3 to 0.6 parts, and Fe2O3 is 0.01 to 0.15 parts. When limes are used as CaO material, the content of the CaO in the limes is more than 92 percent, the sulfur content is less than 0.025 percent, and the silicon dioxide content is less than 1 percent. The purity quotient of other components are demanded to reach more than 98 percent. The granularity of the composite slag is less than 1cm<3>.

Description

technical field [0001] The invention relates to a composite slag used for simultaneous desulfurization and dephosphorization in smelting stainless steel by a return method, the composite slag used for desulfurization and dephosphorization of molten steel, and belongs to the technology for smelting stainless steel by a return method. Background technique [0002] When waste stainless steel is used as raw material for smelting in an electric furnace, due to the large amount of alloying elements in the waste stainless steel, if the electric furnace smelting adopts the conventional double slag oxidation method, a large amount of alloying elements will be oxidized, and the high melting point will be produced after the alloying elements are oxidized. Inclusions make the slag dry, reduce fluidity, deteriorate smelting conditions, and are not conducive to the removal of impurity elements sulfur and phosphorus. [0003] If waste stainless steel is used as the raw material, the return...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064C21C7/076
CPCY02P10/20
Inventor 黄诚
Owner WUHAN IRON & STEEL ENG TECH GROUP
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