Converter high-iron-ratio smelting process

A converter and process technology, applied in the field of converter high-speed iron ratio smelting process and high-speed iron ratio smelting process, can solve the problems of increased splashing in the converter, erosion of the furnace lining, slag accumulation in the flue, etc., and achieve the optimization and improvement of economic and technical indicators. To ensure the effect of thermal balance

Inactive Publication Date: 2020-11-03
SHANDONG SHIHENG SPECIAL STEEL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to improper operation in the existing technology, it is easy to cause problems such as increased converter splash, oxygen lance sticking to steel, slag accumulation in the flue, increased steel material consumption, serious lining erosion, and poor end point indicators.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The converter high-iron-ratio smelting process of the present invention comprises the following steps:

[0023] The first step is to prepare steel scrap, according to the ratio of molten iron 89%~91%, scrap ratio 9%~11%, prepare steel materials;

[0024] The second step is feeding. Through heat balance calculation, the charging system is optimized and improved. The converter first adds all the scrap in the scrap, and then adds 90% of the total amount of limestone and 20% of the total amount of dolomite from the high-level silo, and then adds molten iron Blowing;

[0025] The third step is converter blowing. According to different molten iron conditions, according to the mode of "low temperature and low silicon, high temperature and high silicon, low temperature and high silicon, high temperature and low silicon", the height of the oxygen supply lance and the oxygen flow rate of each blowing time period are respectively formulated. size:

[0026] 1) In the early stage ...

Embodiment 2

[0035] The converter high-iron-ratio smelting process of the present invention is the same as that of Example 1, wherein, in the converter blowing process of the third step, magnetic separation slag is also added in the early stage of blowing, and the magnetic separation slag is determined according to the thermal equilibrium temperature condition Furnace-feeding amount; the added amount of the magnetic separation slag is 1 / 4 of the total amount of lime added. The magnetic separation slag includes iron-containing magnetic separation steel slag obtained by screening solid converter slag by means of magnetic separation.

Embodiment 3

[0037] The high-iron-ratio smelting process of the converter of the present invention is the same as that of Example 1, which also includes slag splashing to protect the furnace. The slag after tapping is blown and splashed at high pressure, cooled and solidified on the surface of the furnace lining to form a layer of high The slag layer at the melting point is bonded to the furnace lining to protect the lining bricks; specifically, 1) leave all or part of the slag after the molten steel is exhausted; 2) observe the thickness of the slag and the temperature, and decide whether to add slag adjustment 3) Shake the furnace so that the slag hangs on the large surface of the front and rear sides; 4) Lower the gun to the predetermined height, start blowing nitrogen and splashing slag, so that the furnace lining is completely covered with slag, and then stop the gun at the At a certain position, slag splashing is carried out at the place where slag splashing is particularly required; ...

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PUM

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Abstract

The invention discloses a converter high-iron-ratio smelting process. The process comprises the following steps that firstly, scrap steel material preparation is performed, specifically, steel-iron materials are prepared according to the molten iron ratio of 89%-91% and the scrap steel ratio of 9%-11%; secondly, charging is performed, all scrap steel materials in scrap steel are added into a converter firstly, then 90% of total limestone and 20% of total dolomite are added from a high-level bin, and then molten iron is added for blowing; thirdly, converter blowing is performed; fourthly, normal smelting to tapping is performed according to the prior art; and fifthly, slag remains in the converter. The converter high-iron-ratio smelting process is technically optimized from the aspects of aloading system, an oxygen supply system, a slag-making system, slag remaining operation, furnace type control and the like, so that thermal balance is ensured, stable operation of the converter undera high-iron-ratio production mode is achieved, economic and technical indexes such as steel-iron material consumption and slag-making material consumption are optimized and improved, stable operationof the furnace condition is achieved, the cost is lowered, and the smelting efficiency is improved.

Description

technical field [0001] The invention relates to a high-iron-ratio smelting process, in particular to a converter high-iron-ratio smelting process, and belongs to the technical field of converter steelmaking. Background technique [0002] When scrap resources are scarce, the price is high, and procurement is difficult, or when the output of blast furnace hot metal is large and the number of converter furnaces is small, in order to use less scrap steel and digest the hot metal, it is necessary to use the converter to make steel at a high ratio of hot metal to hot metal. The characteristic of converter high-iron ratio smelting is that the amount of molten iron entering the furnace is large, and the heat in the furnace is surplus, so a large amount of slag forming material, slag steel, magnetic separation slag and other raw materials need to be added as coolants. However, due to improper operation in the prior art, it is easy to cause problems such as increased converter splash,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C5/32C21C7/00C22C33/06
CPCC21C5/28C21C5/32C21C7/00C22C33/06
Inventor 曾四宝张利武赵滨陈焕建田新喜闫栋楚士进贾培刚
Owner SHANDONG SHIHENG SPECIAL STEEL GROUP
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