Cold state steel slag recycling steelmaking technology

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 Effect of area and optimized feeding method

Inactive Publication Date: 2018-11-06
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 state steel slag recycling steelmaking technology
  • Cold state steel slag recycling steelmaking technology
  • Cold state steel slag recycling steelmaking technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Steel of U71 steel type is smelted on a 120-ton converter in a steel factory. The actual weight of semi-steel molten iron entering the furnace is 132t, the weight of scrap steel is 5t, and the weight of steel tapping is 128.8t. Finally, put semi-steel molten iron and scrap steel into the converter. After starting blowing, add cold steel slag into the converter, and then add lime, high-magnesia lime and acid composite slag into the converter in batches. The composition and temperature of semi-steel molten iron are as follows As shown in Table 1, the actual amount of auxiliary materials added and the amount of oxygen blowing 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 strong dephosphorization ability. The conventional slag splashing process is adopted to protect the furnace after tapping, and the furnace wall hangs slag well. The activity is 500 ppm.

[0042] T...

Embodiment 2

[0049] The steel of Q235-DG steel is smelted on a 120-ton converter in a steel factory. The actual weight of semi-steel molten iron in the furnace is 141t, the weight of scrap steel is 0t, and the weight of steel is 131.56t. After the furnace is finished, put half of the molten steel into it. After blowing starts, add two-thirds of the cold steel slag within 6 minutes after the blowing starts, and add the remaining one-third of the cold steel slag within the next 4 minutes. Lime, high-magnesium lime and acidic composite slagging agent are added to the converter in batches, the composition and temperature of semi-steel molten iron are shown in Table 4 below, and the amount of auxiliary materials and oxygen blown actually added are shown in Table 5 , the tapping composition and tapping temperature are shown in Table 6 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 t...

Embodiment 3

[0057] The steel of Q195 steel type is smelted on a 120-ton converter in a steel factory. The actual weight of semi-steel molten steel in the furnace is 130t, the weight of scrap steel is 6t, and the weight of steel is 125.12t. The specific operation is at the end of the last furnace. Finally, put semi-steel molten steel and steel scrap into it. After blowing starts, add two-thirds of the cold steel slag within 6 minutes after blowing starts, and add the remaining one-third of cold steel slag within the next 4 minutes. After that, 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 smelted in batches After adding during the 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 show...

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Abstract

The invention relates to a cold state steel slag recycling steelmaking technology, and belongs to the technical field of converter steelmaking. The technical problems that cold state steel slag produced through steelmaking is not sufficiently utilized, and the semisteel making production cost is high are solved. According to the technical scheme, the cold state steel slag recycling steelmaking technology comprises the steps of converter feeding, blowing and steel tapping, wherein fed materials comprise semi steel liquid, lime accounting for 8-12kg / t of steel, high-magnesium lime accounting for12-16kg / t of steel, acid compound slag making agent accounting for 7-10kg / t of steel and cold state steel slag accounting for 15-20kg / t of steel. According to converter steelmaking, cold state steelslag replaces some steelmaking accessory materials such as lime, high-magnesium lime and acid compound slag making agent, the production cost is reduced, recycling of steel smelting converter slag resources is achieved, the content of phosphorus and the content of sulfur in tapped steel liquid are each smaller than or equal to 0.011%, and the requirements of high-quality steel grades are 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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IPC IPC(8): C21C5/28C21C5/36C22C38/02C22C38/04
CPCC21C5/28C21C5/36C22C38/02C22C38/04Y02P10/20
Inventor 梁新腾曾建华陈均陈路
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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