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Molten iron tank dephosphorization-converter single decarbonization steelmaking method

A technology for molten iron tank and dephosphorization, which is applied in the field of metallurgy and can solve problems such as steelmaking processes that have not yet been discovered

Active Publication Date: 2022-01-18
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, no steelmaking process with only one converter and only decarburization in the converter without dephosphorization burden has been found

Method used

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  • Molten iron tank dephosphorization-converter single decarbonization steelmaking method
  • Molten iron tank dephosphorization-converter single decarbonization steelmaking method
  • Molten iron tank dephosphorization-converter single decarbonization steelmaking method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Take 2.23kg of pig iron with an initial [P] content of 0.15wt% for dephosphorization test, control the temperature at 1410°C, add 97g of iron oxide scale, 23g of lime and 40g of composite calcium ferrite into the furnace, and carry out dephosphorization for 15min to obtain half steel;

[0043] 2kg of the semi-steel was subjected to a single decarburization test, the blowing initial temperature was 1350°C, 35g of slagging agent lime and 25g of red mud were added to the furnace in batches, and after the slagging agent was completely melted, oxygen blowing was started, and the flow rate was controlled at 0.7m 3 / h, after decarburization for 20min, molten steel is obtained.

Embodiment 2

[0045] It is basically the same as Example 1, except that the dephosphorization time is adjusted from "15min" to "20min".

Embodiment 3

[0047] It is basically the same as Example 1, except that the dephosphorization time is adjusted from "15min" to "10min".

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Abstract

The invention provides a molten iron tank dephosphorization-converter single decarbonization steelmaking method, and relates to the technical field of metallurgy. The molten iron tank dephosphorization-converter single decarbonization steelmaking method comprises the following steps that an efficient dephosphorization agent is put into a molten iron tank in advance, dephosphorization is carried out in the process of blast furnace tapping and blast furnace molten iron transportation through the molten iron tank, and semi-steel with [P] smaller than 0.04wt% and [C] larger than or equal to 3.5wt% is obtained; after the dephosphorization slag is pulled out, the semi-steel is poured into a converter to be decarbonized, and molten steel is obtained; and the efficient dephosphorizing agent comprises iron oxide scale, lime and composite calcium ferrite. According to the method, the phosphorus content of the blast furnace molten iron is reduced to 0.04wt% or below through the efficient dephosphorizing agent, compared with a traditional converter steelmaking process, the converter smelting time is shortened by 3-5min, in the converter decarburization process, due to the fact that the phosphorus load is extremely low, high-carbon-catching steel tapping is easier to achieve at the end point, and the molten steel purity is higher.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a steelmaking method comprising dephosphorization of a ladle and single decarburization of a converter. Background technique [0002] Phosphorus is a typical impurity element in molten steel, and dephosphorization is one of the basic operations in the steelmaking process. The traditional long-process steelmaking process usually includes two processes: hot metal pretreatment and converter blowing. Hot metal pre-dephosphorization refers to the dephosphorization operation performed before the molten iron enters the converter, and lime is mostly used as a dephosphorization agent. However, due to the poor dynamic conditions of molten iron, the dephosphorization efficiency is not high, and the requirements for phosphorus composition of steel grades cannot be met, so part of the dephosphorization task is transferred to the converter smelting process. Therefore, the usual converter ...

Claims

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Application Information

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IPC IPC(8): C21C1/02C21C7/064C21C7/068
CPCC21C1/025C21C7/0645C21C7/068C21C7/06C21C7/076C21C7/064C21C7/0006C21C7/0075C21C5/36
Inventor 张延玲赵峥张威风詹中华
Owner UNIV OF SCI & TECH BEIJING
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