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Cold steel slag recycling steelmaking process

A cold steel slag recycling technology, applied in the cold steel slag recycling steelmaking process, can solve the problems of underutilization of cold steel slag and high production cost of semi-steel steelmaking, so as to reduce the pressure on environmental protection and reduce the site Area, the effect of reducing production costs

Inactive Publication Date: 2018-10-19
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the invention is that the cold steel slag produced by steelmaking is not fully utilized, and the production cost of semi-steelmaking is high

Method used

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  • Cold steel slag recycling steelmaking process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Steel of U71Mn steel type is smelted on a 120-ton converter in a steel factory. The actual weight of molten iron and steel entering the furnace is 130.2t, the weight of scrap steel is 4.3t, and the weight of steel is 128.8t. After the furnace is finished, put semi-steel molten iron and scrap steel into the converter, add cold steel slag into the converter after blowing starts, and then add lime, high-magnesia lime and acidic compound slagging agent into the converter in batches, and the semi-steel molten iron component And the temperature situation is shown in Table 1 below, the auxiliary material amount and oxygen blowing amount actually added are shown in Table 2, and the tapping composition and tapping temperature are shown in Table 3 below. The slag is active in the steelmaking process and has a strong dephosphorization ability. The conventional slag splashing process is adopted at the end of tapping to protect the furnace, and the slag hanging on the furnace wall is...

Embodiment 2

[0048] The steel of Q235-DG steel type is smelted on a 120-ton converter in a steel factory. The actual weight of molten iron and steel entering the furnace is 140.2t, the weight of scrap steel is 6t, and the weight of steel is 135.56t. The specific operation is to splash slag in the previous furnace After the protection of the furnace is completed, put in semi-steel molten steel and scrap steel, and after blowing starts, add two-thirds of the cold steel slag within 6 minutes after the start of blowing, and the remaining one-third of the cold steel slag in the next After adding within 4 minutes, add lime, high magnesium lime and acidic compound slagging agent into the converter in batches, the composition and temperature of semi-steel molten iron are shown in Table 4 below, and the actual amount of auxiliary materials and oxygen blowing are shown in Table 4. 5, the tapping composition and tapping temperature are shown in Table 6 below. The slag is active in the steelmaking pro...

Embodiment 3

[0056] The steel of Q195-BG steel type is smelted on a 120-ton converter in a steel factory. The actual weight of semi-steel molten iron in the furnace is 136t, the weight of scrap steel is 4t, and the weight of steel is 132.12t. After the furnace is finished, put semi-steel molten iron and steel scrap into it. After blowing starts, add two-thirds of the cold steel slag within 6 minutes after the blowing starts, and the remaining one-third of the cold steel slag in the next 4 minutes. After the internal addition, add two-thirds of the total amount of lime, high-magnesium lime and acidic composite slagging agent into the converter, and the remaining one-third of the lime, high-magnesium lime and acidic composite slagging agent will be divided into batches After adding during the smelting process, the composition and temperature of the semi-steel molten iron are shown in Table 7 below, the actual amount of auxiliary materials added and the amount of oxygen blowing are shown in Ta...

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Abstract

The invention relates to a cold steel slag recycling steelmaking process, belongs to the technical field of converter steelmaking and aims to solve the technical problem that cold steel slag generatedin steelmaking is not sufficiently utilized, and the semisteel steelmaking production cost is high. According to the technical scheme, the cold steel slag recycling steelmaking process comprises thesteps of converter discharging, blowing and tapping, wherein discharged materials include semisteel molten iron, 5 kg per ton steel-9 kg per ton steel of lime, 8 kg per ton steel -12 kg per ton steelof high-magnesium lime, 5 kg per ton steel -9 kg per ton steel of an acidic compound slag former and 21 kg per ton steel -26 kg per ton steel of cold steel slag. According to the cold steel slag recycling steelmaking process, the cold steel slag is used for taking the place of part of the lime, the high-magnesium lime, the acidic compound slag former and other steelmaking auxiliary materials, theproduction cost is reduced, the cyclic utilization of steelmaking slag resources is achieved, the phosphorus content and the sulphur content of tapping of molten steel are both smaller than or equal to 0.011%, and the requirement for high-quality steel grade is met.

Description

technical field [0001] The invention belongs to the technical field of converter steelmaking, and in particular relates to a cold steel slag recycling steelmaking process. Background technique [0002] Panzhihua Steel is smelted with vanadium-titanium magnetite, and the molten iron contains about 0.3% V. Therefore, before the converter steelmaking, vanadium needs to be extracted first. After the converter extracts vanadium, the V in the molten iron is oxidized, and at the same time, the Si, Elements such as Mn are also oxidized, and C elements are partially oxidized, so semi-steel is significantly different from ordinary molten iron. Since the simultaneous dephosphorization and vanadium extraction process of vanadium-containing molten iron in the converter has not yet been implemented, after the pretreatment of desulfurization and vanadium extraction in molten iron, the P content basically does not change, and is still about 0.060%. Therefore, for semi-steel converter steel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C5/35C21C7/064C21C5/36
CPCC21C5/28C21C5/35C21C5/36C21C7/064Y02P10/20
Inventor 梁新腾曾建华陈均陈路
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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