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Process of tron melt adding ore revolving furnace for steelmaking

A converter steelmaking and new process technology, applied in the field of metallurgy, can solve problems such as long smelting cycle, rising scrap steel and iron prices, and fluctuations in the structure of furnace materials, and achieve the effects of shortening the smelting cycle, reducing oxygen consumption, and rich ore resources

Inactive Publication Date: 2008-05-21
SHANDONG IRON & STEEL CO LTD
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AI Technical Summary

Problems solved by technology

[0003] 1. At present, there is a shortage of steel scrap resources, and the price of scrap steel and iron blocks has risen, which greatly increases the cost
[0004] 2. The supply of scrap steel is not timely, and the structure of the furnace charge often fluctuates, which adversely affects the stable operation of the converter
[0005] 3. Slow slag formation in the smelting process, difficult slag removal, and long smelting cycle

Method used

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Embodiment Construction

[0008] The technical feature of the present invention is that converter steelmaking is to add ore with molten iron, and its technical operation process is as follows:

[0009] a. By baking and screening the ore, ensure that the ore is dry and uniform in particle size. The physical and chemical indicators of the ore are as follows: TFe>60%, SiO 2 <6%, P<0.02%, S<0.06%, particle size is 10-50mm, water content <2%;

[0010] b. Start the oxygen blowing smelting gun position 1150-1200mm, which is 50-100mm higher than the furnace without ore, and add ore 20-30kg / t steel within 30 seconds of oxygen blowing;

[0011] c. Increase the gun position by 50-100mm in about 2 minutes of blowing, and reduce the oxygen blowing pressure to 0.65Mpa at the same time;

[0012] d. Avoid violent reaction and splashing during the blowing process. After 6 minutes of oxygen blowing smelting, add the remaining ore in small batches, about 100kg / batch. At the same time, the gun position should be increase...

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Abstract

The invention provides a new process of molten iron plus ore converter steelmaking. The technical feature of the invention is that the converter steelmaking is to add ore with molten iron, and to replace all scrap steel and iron lumps with iron ore. Roast and sieve to ensure that the ore is dry and the particle size is uniform. Start the oxygen blowing smelting gun position. Oxygen blowing will be added in proportion to the ore blowing for a certain period of time. After the ore is added within a short time, the present invention has the advantages of rapid slagging during the smelting process, basically no back-drying phenomenon in the middle and late stages, good removal effect of P and S harmful elements, and shortened smelting cycle. At the same time, the ore resources are abundant and the cost is low, and the oxygen consumption is greatly reduce.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a converter steelmaking process. Background technique [0002] At present, all types of converters in domestic steelmaking enterprises adopt the traditional "hot metal + scrap" or "hot metal + scrap + iron block" steelmaking process, which mainly has the following problems: [0003] 1. At present, steel scrap resources are in short supply, and the prices of scrap steel and iron nuggets have risen, greatly increasing costs. [0004] 2. The supply of scrap steel is not timely, and the structure of the furnace charge often fluctuates, which has a negative impact on the stable operation of the converter. [0005] 3. Slow slag formation in the smelting process, difficult slag removal, and long smelting cycle. Contents of the invention [0006] In order to solve the above-mentioned problems in steelmaking, the object of the present invention is to provide a new process of molten...

Claims

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Application Information

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IPC IPC(8): C21C5/28C22B1/14C21C5/30
Inventor 吕铭窦建亮李剑锋郭伟达费燕陈良
Owner SHANDONG IRON & STEEL CO LTD
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