A steelmaking method of ladle dephosphorization-converter single decarburization

A molten iron tank and dephosphorization technology, applied in the field of metallurgy, can solve problems such as steelmaking processes that have not yet been discovered, and achieve the effects of shortening converter smelting time and high purity of molten steel

Active Publication Date: 2022-04-15
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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  • A steelmaking method of ladle dephosphorization-converter single decarburization
  • A steelmaking method of ladle dephosphorization-converter single decarburization
  • A steelmaking method of ladle dephosphorization-converter single decarburization

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 steelmaking method comprising dephosphorization in a ladle and single decarburization in a converter, and relates to the technical field of metallurgy. The steelmaking method of dephosphorization in molten iron tank-converter single decarburization provided by the present invention comprises the following steps: putting a high-efficiency dephosphorization agent into the molten iron tank in advance, performing dephosphorization during blast furnace tapping and molten iron tank transportation of blast furnace molten iron, [P] < 0.04wt%, [C] ≥ 3.5wt% semi-steel; after removing the dephosphorization slag, pour the semi-steel into the converter for decarburization to obtain molten steel; the high-efficiency dephosphorization agent includes oxidation Iron sheet, lime and complex calcium ferrite. The invention uses a high-efficiency dephosphorization agent to reduce the phosphorus content of blast furnace molten iron to below 0.04wt%. Compared with the traditional converter steelmaking process, the converter smelting time of the invention is shortened by 3 to 5 minutes, and the phosphorus load is extremely low during the converter decarburization process. , the end point is easier to achieve high carbon tapping, and the purity of molten steel 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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Patent Type & Authority Patents(China)
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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