Method for alloying manganese ore in LF (ladle furnace)

A manganese ore and alloying technology, which is applied in the field of steelmaking production, can solve the problems of many factors affecting the recovery rate of Mn, difficulty in alloying, and low Mn content in poor manganese ore, so as to achieve good slag removal effect and reduce lining Erosion, the effect of stable recovery rate

Inactive Publication Date: 2012-10-31
HEBEI IRON AND STEEL
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Problems solved by technology

Due to the low Mn content of manganese ore, under the strong oxidation conditions of the converter, it only has the effect of promoting slag removal, and the recovery rate of Mn is too low to play an alloying role.
[0004]Background Art The problem existing in the alloying of manganese ore in the converter is that even for manganese ore, in the strong oxidizing atmosphere of the converter, there are factors affecting the recovery rate of Mn Too much (such as manganese ore addition amount and timing, slag amount, end point carbon, bottom blowing intensity, oxygen supply intensity, etc.), Mn recovery rate is low (up to about 50%), manganese recovery rate is unstable, etc.

Method used

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  • Method for alloying manganese ore in LF (ladle furnace)
  • Method for alloying manganese ore in LF (ladle furnace)
  • Method for alloying manganese ore in LF (ladle furnace)

Examples

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Effect test

Embodiment 1

[0020] Embodiment 1, the present invention is applied to a 50tLF furnace, and the type of smelted steel is hard wire steel, and the steel grade is 45#.

[0021] The main components of manganese ore: Mn45%, SiO 2 9.8%, H 2 O3%; main components of silicon-manganese alloy: Mn66%, Si17%; main components of 55 silicon carbide: SiC55%, free C17%, free SiO 2 17%; lime: effective CaO85%.

[0022] At present, the prices of various materials are: manganese ore: 1830 yuan / t; silicon-manganese alloy: 7900 yuan / t; 55% silicon carbide: 2600 yuan / t; lime: 500 yuan / t; wollastonite: 1600 yuan / t t; fluorite: 1000 yuan / t; electricity fee: 0.52 yuan / kwh.

[0023] In the refining process of the LF furnace, 200kg of manganese ore (137kg of silicon-manganese alloy, 170kg of wollastonite and 80kg of fluorite can be replaced), 300kg of lime and 200kg of silicon carbide are added, and the power consumption increases by 250kwh.

[0024] The composition of refining slag is:

[0025]

[0026] Mang...

Embodiment 2

[0032] The invention is applied to a 50tLF furnace, and the smelted steel is welding wire steel, and the steel number is ER70S-6.

[0033] Manganese ore main components: Mn45%, SiO 2 9.8%, H 2 O3%; low-carbon low-phosphorus silicon-manganese alloy main components: Mn62%, Si26%; low-aluminum ferrosilicon main components: Si75%; 75 silicon carbide main components: SiC75%; lime: effective CaO85%.

[0034] At present, the prices of various materials are: manganese ore: 1830 yuan / t; low-carbon and low-phosphorus silicon-manganese alloy: 8600 yuan / t; low-aluminum ferrosilicon: 8500 yuan / t; 75% silicon carbide: 3200 yuan / t; Lime: RMB 500 / t; Fluorite: RMB 1,000 / t; Electricity fee: RMB 0.52 / kwh.

[0035] In the refining process of the LF furnace, 250kg of manganese ore (which can replace 195kg of low-carbon and low-phosphorus silicon-manganese alloy and 80kg of fluorite), 420kg of low-aluminum ferrosilicon, 380kg of lime, and 66kg of silicon carbide are added, and the power consumpti...

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Abstract

The invention relates to a method for alloying manganese ore in an LF (ladle furnace) furnace, and belongs to the field of steel-making production technologies. The technical scheme is as follows: the manganese ore is added to a ladle to be used as the top slag or added along with the slag in the LF furnace when a converter performs steel tapping; the LF furnace performs arcing and slagging, and carborundum-made reducing slag is synchronously added, and white slag is maintained; after the completion of manganese reduction, the refining is finished. Manganese ore is added with the proportioning of 3 to 6 kg/t; the manganese ore replaces wollastonite and fluorite, as well as replacing some silicomanganese, thus the quantity of added silicomanganese can be reduced; and the quantity of reduced replaced silicomanganese is 2.2 to 4.5 kg/t. According to the method, the manganese ore which is low in cost is applied to the LF furnace for alloying for the first time, and the silicomanganese or ferromanganese high in cost is replaced; the recovery rate of manganese is more than 90%, therefore, the cost of steelmaking is obviously reduced; and meanwhile, the manganese ore has high effect on slagging in the LF furnace, so the manganese ore can replace some fluorite for reducing the environmental pollution and erosion on wrapping liner.

Description

technical field [0001] The invention relates to a method for alloying manganese ore in an LF furnace, belonging to the technical field of steelmaking production. Background technique [0002] In the process of converter steelmaking, using cheap manganese ore instead of ferromanganese or silicomanganese alloy to achieve alloying has obvious cost advantages. The purpose of energy saving and emission reduction has good social benefits and considerable economic benefits. At present, this method has been widely used in foreign converter smelting. On the basis of the "three removals" of molten iron, major Japanese steel mills have fully applied the manganese ore direct reduction alloying technology to practice. A lot of research has also been carried out in China. Baosteel’s 300t converter has carried out direct reduction test of manganese ore under the condition of less slag smelting, and the manganese recovery rate is stable above 50% (Jiang Xiaofang, Chen Zhaoping. The practic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/076
CPCY02P10/20
Inventor 韩志杰常金宝李双武王新东张朝发刘善喜项有兵马德刚刘连祥
Owner HEBEI IRON AND STEEL
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