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Method for smelting high-phosphorus molten iron by duplex-slag remaining process

A slag retention method and high phosphorus technology, which is applied in the manufacture of converters, etc., can solve the problems of aggravated furnace lining erosion, low metal yield, and increased slag consumption, so as to ensure the dephosphorization effect, high molten steel yield, and The effect of increasing the yield of molten steel

Active Publication Date: 2015-03-11
LAIWU STEEL YINSHAN SECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the original smelting process is adopted, on the basis of ensuring the composition requirements of the end point, corresponding problems such as splashing, increased slag consumption, poor end point control, low metal yield, and increased lining erosion will occur.

Method used

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  • Method for smelting high-phosphorus molten iron by duplex-slag remaining process
  • Method for smelting high-phosphorus molten iron by duplex-slag remaining process
  • Method for smelting high-phosphorus molten iron by duplex-slag remaining process

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Embodiment 1-20

[0035] A method for smelting high-phosphorus molten iron by "double-linkage-leaving slag method", said method comprising the following steps:

[0036] 1) Dephosphorization smelting in converter 1: 100% of the decarburization smelting slag is used for dephosphorization smelting with iron ore; during the smelting process, the first batch of slag for dephosphorization is made of lime, sintered ore and iron vanadium, and the lime is always added The amount is 15-20kg / t, the amount of sinter added is 1 / 2 of the total amount of sinter added in dephosphorization smelting, and the bauxite is 400-600kg; ~1.30m, the gun position at the end is kept at 1.2m, the process oxygen pressure is 0.50~0.60MPa, and the process oxygen flow rate is 14500Nm 3 / h, the total oxygen consumption in the process is 3000~3200Nm 3 , the flow rate of bottom blowing mode is 1800Nm 3 / h; Add two batches of limestone after slagging, each batch of limestone is 400-500kg; after the end of the dephosphorization s...

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Abstract

The invention discloses a method for smelting high-phosphorus molten iron by a duplex-slag remaining process, which comprises the following steps: 1) carrying out dephosphorizing smelting in a converter 1; 2) adding semisteel obtained by dephosphorizing smelting into a converter 2 to carry out decarbonizing smelting; 3) carrying out decarbonizing smelting in the converter 2 to obtain acceptable molten steel; and 4) carrying out spattering drying on the furnace slag subjected to decarbonizing smelting, carrying out slag remaining, carrying out next-furnace dephosphorizing smelting, and repeating the steps 1)-3) to complete the smelting of the next-furnace high-phosphorus molten iron. The method can effectively ensure the dephosphorization effect of the dephosphorizing furnace, so that the end phosphorus content of the semisteel in the dephosphorizing furnace is stable at 0.040% below.

Description

technical field [0001] The invention belongs to the field of converter steelmaking, and in particular relates to a method for smelting high-phosphorus molten iron by a "double-slag method". Background technique [0002] With the continuous downturn of the steel market, reducing costs and increasing efficiency has become an urgent problem to be solved in the daily management of steel enterprises at present and in the future. As an important part of the cost structure, iron ore occupies a large proportion in the cost structure. Therefore, the use of low-priced high-phosphorus iron ore has become the primary consideration of iron and steel enterprises at this stage. In addition, with the increasing scarcity of iron ore resources, the utilization of low-grade iron ore resources with high phosphorus content will also become a problem that iron and steel enterprises must face. [0003] With the gradual increase in the proportion of high-phosphorus iron ore used, the proportion of...

Claims

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Application Information

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IPC IPC(8): C21C5/28C21C5/36
Inventor 温福新郭伟达张佩沈彬彬张新硕王容甲高山张海波刘忠建
Owner LAIWU STEEL YINSHAN SECTION CO LTD
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