Convertor steelmaking method capable of reducing slag quantity

A converter steelmaking and slag production technology, which is used in the manufacture of converters, the improvement of process efficiency, and the production of lime, can solve the problems of large consumption of lime and light-burning dolomite, and is beneficial to splashing slag to protect the furnace and protect the Furnace lining, the effect of reducing metal splash

Active Publication Date: 2011-10-12
SHOUGANG CORPORATION
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Problems solved by technology

[0005] The purpose of the present invention is to provide a converter steelmaking method that reduces the amount of slag, which solves the problem of large consumption of lime and light-burned dolomite in the conventional converter steelmakin

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  • Convertor steelmaking method capable of reducing slag quantity
  • Convertor steelmaking method capable of reducing slag quantity
  • Convertor steelmaking method capable of reducing slag quantity

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Embodiment Construction

[0048] The experiment was carried out in a 210-ton top-bottom combined blowing converter. Table 1 shows the conditions of molten iron and steel scrap in the furnace, Table 2 shows the conditions of auxiliary materials for steelmaking, Table 3 shows the amount of slag splashing per ton of steel, and Table 4 shows the parameters of the steelmaking process.

[0049] The SGRP technological process of the present invention is as figure 1 As shown, the process flow is a cyclic process, the starting point is slag splashing to protect the furnace, and the end point is slag remaining in the furnace; the furnace is protected by slag splashing, the liquid slag in the furnace is solidified, scrap steel is added, molten iron is added, and the first stage blowing - It consists of eight stages: dephosphorization stage, intermediate slag dumping, second stage blowing-decarburization stage, tapping and furnace slag retention. Use the slag left in the furnace to protect the furnace by slag spla...

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Abstract

The invention belongs to the technical field of convertor steelmaking, and provides a convertor steelmaking method capable of reducing slag quantity. The process flow disclosed by the invention is circular process flow starting with step of protecting a furnace by slag splashing and ending with the step of remaining slag in the furnace. The process flow specifically comprises the following eight stages: protecting a furnace by slag splashing; curing liquid slag in the furnace; adding scrap steel; adding molten iron; blowing-dephosphorizing at a first stage; deslagging in the middle; blowing-decarbonizing at a second stage; tapping; and remaining slag in the furnace. Compared with the conventional convertor steelmaking process, the convertor steelmaking provided by the invention has the beneficial effects that lime consumption is lowered by 40.5%, light-roasting dolomite consumption is lowered by 76.8%, and the total consumption of the lime and light-roasting dolomite is lowered by 55.5% on the premise that phosphorus content at the end point is not more than 0.015%.

Description

technical field [0001] The invention provides a converter steelmaking method for reducing the amount of slag, and belongs to the technical field of converter steelmaking. Background technique [0002] For the traditional converter steelmaking method, in order to ensure the dephosphorization effect, high alkalinity and large slag volume operations are often required, resulting in increased steel slag discharge and steel material consumption, which increases production costs. Many literatures have reported (such as [2007 China Iron and Steel Annual Conference Proceedings], 1 (2007), p.1-62) the amount of slag produced by traditional converter steelmaking is generally 120-150 kg per ton of steel, according to the CaO content in slag 40% calculation, the weight of CaO in the slag is generally 48-60 kg per ton of steel. Under the condition of using high-quality lime (CaO%=92), some literature (for example, [Steelmaking], 1 (2002), p.30) reported that the amount of lime per ton o...

Claims

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Application Information

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IPC IPC(8): C21C5/28
CPCY02P10/20Y02P40/40
Inventor 王新华崔阳南晓东李海波张立国朱国森宋春明姜仁波李承祚孙铁亢小敏张涛王建伟邱世忠李本海靳伟
Owner SHOUGANG CORPORATION
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