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Recovery and utilization method of useful element in free-cutting steel refining slag

A technology for refining slag and free-cutting steel, which is applied in recycling technology, furnaces, electric furnaces, etc., can solve the problems of unacceptable and increased MnO content, and achieve the effect of reducing costs

Inactive Publication Date: 2009-03-25
SHANDONG SHIHENG SPECIAL STEEL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the diffusion deoxidizer can reduce the MnO in the slag to the molten steel, since the free-cutting steel refining process requires the free oxygen content in the steel to be controlled at about 80ppm, and the [Si] content is required to be ≤0.03%, the free-cutting steel refining Diffusion deoxidizers are not allowed to recover MnO during the refining process, resulting in increased MnO content in the slag

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] The specific implementation will be described below by taking ordinary steel with a yield of 1000 kg as an example.

[0019] Firstly, the air-cooled free-cutting steel refining slag is crushed into blocks less than 10 cm in size, and stored in the bulk hopper of the electric furnace for use. When ordinary steel is alloyed after the electric furnace, add 300 kg of easy-cutting refining slag and 25 kg of SiC powder deoxidizer to the ordinary molten steel refining ladle, so that the ladle enters the refining furnace position, and after reduction operation, the white slag is maintained for more than 15 minutes , to ensure that MnO in the slag is reduced to Mn and returned to molten steel, and FeO is reduced to Fe and returned to molten steel.

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Abstract

The invention discloses a method for recovering and utilizing useful elements in automatic steel refined slag by utilizing common molten steel. The method crushes the automatic steel refined slag air-cooled into blocks of less than 10cm and the blocks are stored into an electric furnace bulk silo to be used; during the process of discharging common steel by an electric furnace and the weight ratio of common molten steel: automatic steel refined slag: SiC powder deoxidizing agent is 40: 12: 1, the automatic steel refined slag is added into the common steel refining ladle of the electric furnace, then the SiC powder deoxidizing agent is added simultaneously, and MnO and FeO in the slag are reduced into the common molten steel through the reducing atmosphere of the refining furnace. The method not only makes full use of the useful elements in the automatic steel refined slag but also reduces the cost of smelting common molten steel.

Description

technical field [0001] The invention relates to the recovery and utilization of manganese and iron elements in free-cutting steel refining slag in the iron and steel industry. Background technique [0002] Free-cutting steel is a new type of steel developed by us in recent years. The main production varieties are Y45S20, SUM23HS, and 1215HS. Its biggest advantage is its low production cost and broad application prospects. In the refining process of free-cutting steel, because the affinity of Mn element to oxygen is higher than that of Fe (see reaction formula ①), Mn takes away the oxygen in the molten steel to form MnO, a deoxidized product that does not remain in the molten steel, and floats into the slag. [0003] [FeO]+[Mn]=[Fe]+[MnO] ① [0004] The statistical results of the detection and analysis of the components of the free-cutting steel refining slag are shown in Table 1. [0005] Table 1 [0006] furnace number FeO SiO CaO S Al2O3 MgO MnO...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/06C22B7/04C21C5/52C22B47/00
CPCY02P10/20Y02W30/50
Inventor 李洪波张洪来仲光辉安玉生
Owner SHANDONG SHIHENG SPECIAL STEEL GROUP