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High-carbon ferro-chrome smelting method

A technology of high-carbon ferrochromium and smelting methods, which is applied in the direction of electric furnaces, furnaces, furnace types, etc., can solve the problems that dust cannot be recycled, achieve the effects of reducing energy consumption, improving smelting quality, and avoiding remelting

Inactive Publication Date: 2018-12-11
JINAN JIGANG IRON ALLOY FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The smelting method provided by the invention can effectively solve the problem that a large amount of dust generated in the smelting process cannot be recycled while smelting high-carbon ferrochrome. At the same time, the method of the invention can greatly increase the yield of chromium in ferrochrome, Reduce harmful elements such as phosphorus and sulfur, and improve the smelting quality of ferrochrome

Method used

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  • High-carbon ferro-chrome smelting method

Examples

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Comparison scheme
Effect test

Embodiment 1

[0038](1) Firstly, pass a current of alternating frequency 1000HZ into the spiral water-cooled coil outside the intermediate frequency induction furnace, so that a magnetic field will be generated in the space surrounded by the coil and around it, and then add natural block high carbon with 1 / 2 of the furnace cavity volume For ferrochrome, add powdered high-carbon ferrochrome after the melting reaches 2 / 3, and then add powdery and / or granular high-carbon ferrochrome and slagging agent with a mass ratio of 7:3 after melting Mixed material, melt clear; the particle size of the mixed material is 3-7mm, and the ratio of the particle size of the powdery and / or granular high-carbon ferrochrome to the penetration depth of the current is controlled between 5-6; the slagging agent made of SiO 2 , CaO, Gr 2 o 3 、Al 2 O composition, the mass ratio is 2:3:1:1.

[0039] (2) the liquid steel that melts clear in the step (1) is adopted to stay the steel method operation: promptly tapping...

Embodiment 2

[0044] (1) Firstly, pass a current of alternating frequency 1200HZ into the spiral water-cooled coil on the outside of the intermediate frequency induction furnace to generate a magnetic field in the space surrounded by the coil and around it, and then add natural block high carbon with 1 / 6 of the furnace cavity volume For ferrochrome, add powdered high-carbon ferrochrome after the melting reaches 2 / 3, and then add a 10:1 mixture of powdery and / or granular high-carbon ferrochromium and slagging agent after melting, Melt clear; the particle size of the mixture is 3-7mm, the particle size of the powdery and / or granular high-carbon ferrochrome and the penetration depth ratio of the current are controlled between 5-6; the slagging agent is made of SiO 2 , CaO, Gr 2 o 3 、Al 2 O composition, the mass ratio is 1:2:0.5:0.5.

[0045] (2) the liquid steel that melts clear in the step (1) is adopted to stay the steel method operation: promptly tapping amount is 65% of furnace chamber ...

Embodiment 3

[0047] (1) Firstly, pass a current of alternating frequency 1100HZ into the spiral water-cooled coil outside the intermediate frequency induction furnace to generate a magnetic field in the space surrounded by the coil and around it, and then add natural block high carbon with 1 / 6 of the furnace cavity volume For ferrochrome, add powdered high-carbon ferrochrome after the melting reaches 2 / 3, and then add a 9:2 mixture of powdery and / or granular high-carbon ferrochrome and slagging agent after melting, Melt clear; the particle size of the mixture is 3-7mm, the particle size of the powdery and / or granular high-carbon ferrochrome and the penetration depth ratio of the current are controlled between 5-6; the slagging agent is made of SiO 2 , CaO, Gr 2 o 3 、Al 2 O composition, the mass ratio is 3:5:2:2.

[0048] (2) the liquid steel that melts clear in the step (1) is adopted to stay the steel method operation: promptly tapping amount is 80% of furnace chamber volume, and reten...

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Abstract

The invention relates to a high-carbon ferro-chrome smelting method and belongs to the technical field of smelting of high-carbon ferro-chrome. The high-carbon ferro-chrome smelting method comprises the following steps of: 1, firstly, energizing a current with an alternative frequency into a spiral water cooling coil outside an induction furnace so as to generate a magnetic field in a space surrounded by the coil and around, then adding natural block high-carbon ferro-chrome, adding powder and / or granular high-carbon ferro-chrome after melting down, then adding a mixture formed by the powder and / or granular high-carbon ferro-chrome and a slag forming constituent after melting down, and melting down; 2, operating molten steel which is molten down by adopting a dominant pool method, then continuously adding the mixture formed by the high-carbon ferro-chrome and the slag forming constituent into the residual molten steel, and melting down; 3, repeating the step 2. According to the smelting method disclosed by the invention, when the high-carbon ferro-chrome is smelted, not only can a problem that a great amount of dust generated in the smelting process cannot be recycled be effectively solved, but also yield of chrome in the ferro-chrome can be greatly improved, harmful elements of phosphorus, sulphur and the like are reduced, and smelting quality in the ferro-chrome is improved.

Description

technical field [0001] The invention relates to the technical field of smelting high-carbon ferrochrome, in particular to a method for smelting high-carbon ferrochrome. Background technique [0002] High-carbon ferrochromium is an important basic alloy variety, and the demand is huge. General iron and steel enterprises need a particle size of 10-60mm. In order to improve the comprehensive yield and economic value of high-carbon ferrochrome, people have developed many high-carbon ferrochrome smelting methods to avoid environmental pollution and raw material loss; such as patent application CN 107058677 A discloses a smelting method using stainless steel electric furnace slag, including: Ⅰ. Continuously adding high-carbon ferrochrome with Si≥2.5% into the intermediate frequency electric furnace, melting all the high-carbon ferrochrome, and pouring it into a stainless steel ladle; Ⅱ. The electric furnace is equipped with nickel stainless steel scrap, chrome-nickel pig iron, st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/52
CPCC21C5/5241C21C2200/00
Inventor 王铮赵素敏杜婧杨兴友孙照源李鹏韩文举张海涛李明波李发欣朱慧张琦涛
Owner JINAN JIGANG IRON ALLOY FACTORY
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