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 c

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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Example Embodiment

[0047] Example 1

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

[0049] Step 1: Use a 120-ton converter for the test. After tapping, the slag-retaining operation is used. An average 350kg magnesium ball is added. The average slag splashing time is 3.8 minutes. The final slag splashing and drying are all left in the converter. The molten iron is poured into the converter for "single slag" process operation.

[0050] Step 2: The average amount of cast residue added is 3.4 tons, and the average amount of steel tapping is 125 tons. When the lance blowing slag starts to melt, start to add lime in a small number of batches. The average amount of lime added is 33.41kg / t steel (one of which After adding lime (average 950kg), light burnt dolomite 13.40kg / t steel, sintered ore 5.5kg / t steel, magnesium ball average 10.07kg / t steel. The average oxygen supply time is 14.09min (the average oxygen supply time after one of them is 0.86min), and the oxy...

Example Embodiment

[0054] Example 2

[0055] The "dual slag" process is adopted to recycle the hot cast residue.

[0056] Step 1: Use a 120-ton converter for the test. After tapping, use the slag-retaining operation. Add an average of 320kg magnesium balls. The average slag splashing time is 3.5 minutes. The final slag splashing and drying are all left in the converter. The molten iron is poured into the converter for the "double slag" process operation.

[0057] Step 2: The average amount of cast residue added is 3.3 tons, and the average amount of tapped steel is 125.1 tons. When the lance blowing slag begins to melt, start to add lime in small quantities and batches. The average amount of lime added is 28.99kg / t steel (one After adding lime (average 850kg), light burned dolomite 13.69kg / t steel, sintered ore 9.35kg / t steel, magnesium ball average 7.12kg / t steel. The average oxygen supply time is 14.56min (the average oxygen supply time after one of them is 1.05min), and the oxygen consumption is 4...

Example Embodiment

[0061] Example 3

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

[0063] Step 1: Use a 120-ton converter for the test. After tapping, use the slag-retaining operation. Add 250kg (2kg / t steel) magnesium balls. Splash the slag for 3min. After the final slag splashing and drying, all will be left in the converter. The molten iron from the cast residue is added to the converter for "single slag" process operation.

[0064] Step 2: Add 4 tons of cast residue and 125 tons of steel. When the lance blowing slag starts to melt, start to add lime in small quantities and batches. The amount of lime added is 44kg / t steel (one of which is poured into 625kg lime , Ie 5kg / t steel), light-burned dolomite 12kg / t steel, sintered ore 8.1kg / t steel, and magnesium balls average 9.05kg / t steel. The average oxygen supply time is 14.9min (one of them is 0.5min after being poured), and the oxygen consumption is 45.4Nm 3 / t, gas recovery 96.6Nm 3 / t. The smeltin...

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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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