Converter retaining operation method of preventing splash slag and reducing iron loss

A technology for protecting furnaces and converters by slag splashing, which is applied in the manufacture of converters, etc., and can solve problems such as difficulty in settling iron beads in slag, increased iron loss in slag, and affecting the effect of slag splashing on furnace protection, etc.

Inactive Publication Date: 2007-02-14
王虎
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Even so, due to the large number of smelted steels and the large passive range of end point components, after adopting the technology of slag splashing to protect the furnace, only Baosteel still has 7% of the furnaces whose MgO content in the end slag has not reached saturation, which directly affects the slag splash protection. The effect of the furnace
[0005] At present, the operation method of slag splashing to protect the furnace is adopted at home and abroad: one is to add light-burned magnesium balls and light-burned dolomite (or magnesite) in the early stage or process of smelting, and make the slag sticky at the end of smelting, and the final slag of the converter is The content of MgO can meet the requirements of the refractoriness of the slag-splashing layer. When the superheat of the slag is not high, nitrogen can be injected directly after tapping to carry out the slag splashing operation; another method is that the MgO content in the slag after tapping cannot reach For the value required by the slag splash layer, it is necessary to ...

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  • Converter retaining operation method of preventing splash slag and reducing iron loss
  • Converter retaining operation method of preventing splash slag and reducing iron loss
  • Converter retaining operation method of preventing splash slag and reducing iron loss

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Embodiment

[0017] Example: 50-ton converter, the furnace campaign is in the middle stage. After the converter stops blowing, the steel will not be tapped immediately. Instead, powdered graphite and light-burned dolomite (1.2 kg of carbon / ton steel are added at a time) are added to the furnace first, and the steel will be tapped after the reaction is completed. Steel, because the furnace body is in the tapping position, the slag spreading surface area is large, the slag layer is thin, and the graphite powder is evenly blown, so that the area of ​​the TFe boundary between the graphite powder and the slag is greatly increased. At the same time, the amount of graphite powder blown in is small (ton steel 1.2 kg), so that the temperature drop of the slag is small. At this time, the viscosity of the slag is small, the (FeO) diffusion rate is fast, and the generated CO bubbles are easy to overflow. Therefore, the reaction between C-(FeO) is relatively sufficient, so that the FeO in the slag is great...

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Abstract

The present invention discloses that before and during tapping, carbon containing reductant coal powder, coke powder or graphite powder is added to the surface of slag liquid inside converter so as to reduce FeO in slag liquid, raise slag viscosity and smelting point and protect converter. The method is simple and low in cost, and can reduce steel making cost of converter obviously.

Description

Technical field [0001] The invention relates to a converter slag splashing furnace protection process, in particular to a converter slag splashing furnace protection operation method for reducing iron loss. Background technique [0002] Splashing the furnace to protect the furnace requires "splashing, sticking, and not falling off". "Splashing" means to pour the slag as little as possible, keep the slag, and make a fuss about smelting a hit; "sticky" means to ensure that the slag has a certain viscosity, control the peroxide, control the end carbon, and reduce the tapping temperature; "No drop" means to increase the melting point of the slag, reduce the iron oxide content, and increase the alkalinity and magnesium oxide content. The raw materials used in my country's converter steelmaking plants are very different in the final slag composition due to the large differences in production products and process systems. [0003] The main components MgO, TFe and alkalinity (CaO / SiO) th...

Claims

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Application Information

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IPC IPC(8): C21C5/28
Inventor 王虎
Owner 王虎
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