Method for recycling steel-ladle hot-state casting residues by means of converter

A technology of casting slag and converter slag, which is applied in the manufacture of converters, etc., can solve the problem that the waste heat of casting slag itself cannot be effectively utilized, and achieve the effects of dephosphorization in the converter, improvement of smelting efficiency, and obvious environmental protection benefits

Active Publication Date: 2019-04-12
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the above analysis, the present invention aims to provide a method for recycling hot casting slag in a converter to solve the problem that the casting slag and its own waste heat cannot be effectively utilized in the prior art

Method used

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  • Method for recycling steel-ladle hot-state casting residues by means of converter
  • Method for recycling steel-ladle hot-state casting residues by means of converter
  • Method for recycling steel-ladle hot-state casting residues by means of converter

Examples

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Effect test

Embodiment 1

[0048] The "single slag" process is used to recycle hot casting slag from the ladle.

[0049] Step 1: Use a 120-ton converter to conduct the test. After the steel is tapped, the slag operation is adopted, and an average of 350kg of magnesium balls are added. The slag splashing time is 3.8 minutes on average. The final slag splashing is all left in the converter. The molten iron is mixed into the converter for "single slag" process operation.

[0050] Step 2: The average amount of casting slag added is 3.4 tons, and the average amount of steel tapping is 125 tons. When the blowing slag material starts to melt, start to add lime in small quantities, and the average amount of lime added is 33.41kg / t steel (one pour After that, add lime on average 950kg), light burnt dolomite 13.40kg / t steel, sintered ore 5.5kg / t steel, magnesium balls average 10.07kg / t steel. The average oxygen supply time is 14.09min (the average oxygen supply time is 0.86min after pouring), and the oxygen cons...

Embodiment 2

[0055] The "double slag" process is adopted for the recycling of hot casting slag.

[0056] Step 1: Use a 120-ton converter to conduct the test. After the steel is tapped, use the slag operation. Add an average of 320kg of magnesium balls. The average slag splashing time is 3.5 minutes. The molten iron is mixed into the converter for "double slag" process operation.

[0057] Step 2: The average amount of casting slag added is 3.3 tons, and the average amount of steel tapping is 125.1 tons. When the blowing slag material under the blowing gun starts to melt, lime is added in small quantities in multiple batches, and the average amount of lime added is 28.99kg / t steel (one pour After that, add lime on average 850kg), light burnt dolomite 13.69kg / t steel, sintered ore 9.35kg / t steel, magnesium balls average 7.12kg / t steel. The average oxygen supply time is 14.56min (the average oxygen supply time is 1.05min after pouring), and the oxygen consumption is 46.1Nm 3 / t, gas recovery...

Embodiment 3

[0062] The "single slag" process is used to recycle hot casting slag from the ladle.

[0063] Step 1: Use a 120-ton converter to conduct the test. After the steel is tapped, use the slag operation, add 250kg (2kg / t steel) magnesium balls, splash the slag for 3 minutes, and leave the final slag splashed in the converter. The molten iron of casting slag is blended into the converter for "single slag" process operation.

[0064] Step 2: Add 4 tons of casting slag and 125 tons of steel tapping. When the blowing slag starts to melt, start to add lime in small batches. The amount of lime added is 44kg / t steel (625kg of lime is added after one pour , that is, 5kg / t steel), light-burned dolomite 12kg / t steel, sintered ore 8.1kg / t steel, and magnesium balls an average of 9.05kg / t steel. The average oxygen supply time is 14.9min (the oxygen supply time is 0.5min after one pour), and the oxygen consumption is 45.4Nm 3 / t, gas recovery 96.6Nm 3 / t. The smelting cycle is 37.5min.

[0...

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Abstract

The invention discloses a method for recycling steel-ladle hot-state casting residues by means of a converter, and belongs to the technical field of ferrous metallurgy. The problem that the casting residues and self waste heat of the casting residues cannot be effectively utilized in the prior art is solved. The method comprises the following steps that the hot-state casting residues remaining inthe steel ladle after molten steel pouring are returned to the converter steelmaking process for recycling and utilization, and the alkalinity of the hot-state casting residues ranges from 6 to 8. According to the method, the liquid-state continuous casting residues are used in an energy-saving, environment-friendly, effective and stable manner for realizing the heat-state recycling of the castingresidues; and the consumption of steel materials can be reduced, the sensible heat of furnace slag can be effectively utilized, the smelting efficiency can be improved, the steelmaking production cost is reduced, the quality of molten steel is improved, and the environment-friendly benefit is obvious.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, in particular to a method for recycling hot casting slag of a ladle in a converter. Background technique [0002] The substances remaining in the ladle after the molten steel is cast are collectively referred to as casting slag. [0003] In the prior art, the casting slag is usually directly poured into the slag tank, and after cooling to room temperature, the slag and steel are separated, and the large pieces of slag and steel are sorted out and returned to the steelmaking process for secondary smelting; the separated steel slag is subjected to magnetic The steel slag from the magnetic separation also enters the steelmaking process and is used as a metal material for smelting, and the remaining tailings are kept for later use. [0004] However, the above method has limitations, such as long cooling, crushing, slag separation, magnetic separation and other treatments, a large a...

Claims

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Application Information

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IPC IPC(8): C21C5/44C21C5/36
CPCC21C5/36C21C5/441C21C2200/00
Inventor 孟华栋刘浏姚同路
Owner CENT IRON & STEEL RES INST
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