High-efficiency dephosphorization smelting method for medium phosphor hot metal revolving furnace

A smelting method and molten iron technology, applied in the manufacture of converters, etc., can solve the problems of slow smelting rhythm, high smelting cost, environmental pollution, etc., and achieve the effect of speeding up the smelting rhythm and reasonable ratio

Active Publication Date: 2008-12-03
SHANGHAI MEISHAN IRON & STEEL CO LTD
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Problems solved by technology

[0003] The purpose of the present invention is to provide a high-efficiency dephosphorization smelting method of medium-phosphorus molten iron converter, which mainly solves the techn

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  • High-efficiency dephosphorization smelting method for medium phosphor hot metal revolving furnace
  • High-efficiency dephosphorization smelting method for medium phosphor hot metal revolving furnace
  • High-efficiency dephosphorization smelting method for medium phosphor hot metal revolving furnace

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[0014] According to the invented medium-phosphorus molten iron converter smelting low-phosphorus method, 10 furnaces are smelted on a 150-ton converter. The main metal materials are molten iron, scrap steel and pig iron nuggets (the phosphorus content is the same as that of molten iron). The proportion of metal materials and the phosphorus content of molten iron are shown in Table 1. Dephosphorization is carried out in the early stage of converter smelting, and quicklime and ore are added. After the pre-dephosphorization is completed, the slag pressing agent is added. The specific components and usage amount are shown in Table 2. After dumping the slag, add lime and ore to adjust the slag according to the slag situation. The oxygen supply intensity of the whole process is shown in Table 3. The chemical composition of the end point obtained from smelting is shown in Table 4.

[0015] Table 1. Implementation of the main raw material ratio and molten iron parameters

[0016]

[001...

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Abstract

The invention relates to an efficient dephosphorization smelting method in a medium phosphorus hot metal converter, which mainly solves the technical problems that the existing dephosphorization agent contains large amount of fluorites, the environmental pollution is easy to be caused, the smelting cost is too high, etc. The smelting method comprises the steps as follows: (a) the top-bottom composite smelting is adopted, the material components of metal main material which is put in have the weight percentage that the molten iron is 85 to 93 percent, and scrap steel or pig irons are 7 to 15 percent; (b) the dephosphorization smelting oxygen is controlled in the prior period; (c) slagging material containing MgO is added at the back part of a downwards-blowing gun, wherein, quicklime is added to control the binary basicity to range from 2.0 to 3.0, and iron ore is added in to adjust the slag discharge temperature in prior period until the temperature reach 1470 DEG C; (d) the slag discharge control in the dephosphorization prior period comprises the steps that the oxygen blowing quantity is controlled to be about two fifth of the oxygen blowing quantity in normal converting, the converting time is 3 to 6 minutes, and slag preventer is added in before slag discharge, wherein, the quantity of the slag preventer is 200 to 500kg; (e) later dephosphorization control has the steps that the oxygen blowing quantity is controlled, the quicklime needs to be added in order to accelerate the slag melting, the iron ore is added in to control the end point temperature to be less than or equal to 1650 DEG C. The efficient dephosphorization smelting method is suitable for a large converter to execute the deep dephosphorization smelting.

Description

Technical field: [0001] The invention relates to a dephosphorization smelting method of a molten iron converter, in particular to a high-efficiency dephosphorization smelting method of a medium-phosphorus molten iron converter. It is especially suitable for deep dephosphorization smelting in large converters (150 tons and above). Background technique: [0002] Phosphorus is an impurity element in molten iron and steel, and its content is ultimately related to the quality of steel products, especially some special steel grades. In the past 20 years, with the development of industries such as national defense, aviation and aerospace, petroleum, automobiles, and microelectronics technology, higher requirements have been put forward for the performance of steel materials, and the requirements for the control of steel composition have reached an almost harsh level. A large number of high-quality steels require a phosphorus content of less than 0.015%; low-temperature steel pipes...

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Application Information

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IPC IPC(8): C21C7/064C21C5/28
Inventor 唐洪乐程乃良冷祥贵邹俊苏左康林赵国光虞大俊
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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