Scrap steel batching method for converter smelting

A converter smelting and scrap steel technology, applied in the field of steelmaking, can solve the problems of complex batching method, large workload, small workload, etc., achieve the effect of scientific and reasonable batching method, solve the scrap steel batching, and reduce the iron-steel ratio

Pending Publication Date: 2022-04-15
WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for batching steel scrap for converter smelting in order to solve the existing batching methods in the prior art which are complex, heavy workload, and inappropriate batching, which cause blockage of the furnace. The workload is small, and the cloth is composed according to the appropriate ingredients, which can effectively reduce the clogging of the furnace mouth caused by the increase of inappropriate addition of scrap steel, and reduce the cost of raw materials and energy consumption

Method used

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Embodiment approach

[0143] According to a preferred embodiment of the present invention, the method also includes:

[0144] (4) According to the steel scrap type selected in step (3) and its addition ratio and the addition amount of different types of steel scrap obtained, the iron-steel ratio is calculated;

[0145] (5) Select a plurality of groups of initial data, each group of initial data includes the steel scrap type selected in step (3) and its addition ratio, and repeats step (4);

[0146] (6) Select the group with the lowest iron-to-steel ratio in step (5) as the batching scheme.

[0147] In the above-mentioned preferred solution of the present invention, the iron-steel ratio can be calculated according to the selected initial data, and then the initial data can be changed to optimize the composition of scrap steel batching by comparing the obtained iron-steel ratio.

[0148] It should be understood that the iron-to-steel ratio refers to the amount of molten iron divided by the amount of...

Embodiment 1

[0157] Taking the production of HRB400 as an example, the temperature of molten iron is 1350°C, and the mass percentage of Si in the molten iron is 0.4%. Among them, 9 tons of scrap steel are added to the molten iron tank, and the temperature of scrap steel in the molten iron tank is raised to 750°C by blast furnace gas baking, and then 9 tons of scrap steel are added. The amount of molten iron for steel scrap is 119t, and the furnace temperature is known to be 1640°C according to empirical values. According to the cost performance ranking of scrap steel in Table 1 and the actual situation in the factory, the types of scrap steel were comprehensively selected as pig iron (92% yield), heavy waste (94% yield), steel bar briquettes (94% yield), and shaving briquettes (yield rate 91%), industrial briquetting (yield rate 88%), recycled steel scrap (yield rate 35%, referring to the scrap steel produced in the company's production process, specifically structural frames and scrap equi...

Embodiment 2

[0178] Taking the production of HRB400 as an example, the temperature of molten iron is 1350°C, and the mass percentage of Si in the molten iron is 0.4%. Among them, 9 tons of scrap steel are added to the molten iron tank, and the temperature of scrap steel in the molten iron tank is raised to 750°C by blast furnace gas baking, and then 9 tons of scrap steel are added. The amount of molten iron for steel scrap is 119t, and the furnace temperature is known to be 1640°C according to empirical values. According to the cost-effective sorting of scrap steel in Table 1 and the actual situation in the factory, only steel bar briquettes (94% yield) were selected as scrap steel ingredients, 4.5t of lime and 1.5t of magnesium balls were added. There is no need to supplement external heat, and the molten iron, scrap steel and flux in the converter form a critical heat balance. The total amount of steel scrap added, the amount of various types of added steel and the iron-steel ratio are c...

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Abstract

The invention belongs to the field of steelmaking, and relates to a steel scrap batching method for converter smelting, which comprises the following steps: according to the yield of steel scraps and the cooling effect corresponding to the steel scraps, constructing a relational expression between the yield and the cooling effect corresponding to different types of steel scraps; building a model equation of the converter smelting waste heat temperature, the steel scrap adding proportion, the corresponding cooling effect and the total steel scrap adding amount, and building a relation function of the adding amount of different types of steel scraps and the total steel scrap adding amount; selecting the type of the scrap steel and the adding proportion thereof, and obtaining the cooling effect corresponding to the type of the scrap steel through the relational expression; and then according to the cooling effect and the adding proportion corresponding to the waste steel and the converter smelting waste heat temperature, the total adding amount of the waste steel is obtained through the model equation, and the adding amount of different types of waste steel is obtained through the relation function. The batching method is scientific, reasonable and high in universality, the number of manual calculation times can be reduced, real-time use in the online production process is met, abnormal working conditions are reduced, and production raw material cost and energy consumption cost can be saved for users.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular relates to a batching method of scrap steel for converter smelting. Background technique [0002] With the sharp rise in the price of imported iron ore from abroad, the profit margins of domestic steel enterprises are constantly being backlogged. In order to get rid of a large amount of dependence on imported iron ore, scrap steel, as a recyclable green resource, has become the primary choice of various steel enterprises. In the process of rapid economic development in our country, the accumulation of scrap steel in society has increased rapidly, scrap steel resources have become more and more abundant, and the price of scrap steel has fluctuated frequently. operation. However, the existing scrap steel has not been designed for classification and addition, and the addition is disorderly and blind. After the scrap steel is blocked, the model of the blowing sub-lance (ie, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G16C60/00G06F17/11C21C5/28
Inventor 李伟江妮
Owner WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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