Method for increasing yield of molten steel manganese in manganese ore direct-alloying

A technology of alloying and yield, applied in the field of improving manganese ore direct alloying steel water manganese yield, manganese ore direct alloying, can solve the problems of not being widely used in actual production, difficulty in refining production scheduling, increasing refining time, etc. To achieve the effect of shortening the processing cycle, shortening the heating time, and promoting the contact area

Active Publication Date: 2015-09-02
CENT IRON & STEEL RES INST +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] The direct alloying of manganese ore brings good benefits to iron and steel enterprises, but according to the current research results of manganese ore reduction in China, the effect of manganese ore reduction in the steelmaking process is not good, and the recovery rate of manganese is low, so it has not been widely used. In actual production, the main problems are:
[0005] (2) Manganese ore or manganese ore composite pellets are added during the refining process. Due to the various influences of ladle stirring and top slag, the added manganese ore or manganese ore pellets cannot fully contact with molten steel, resulting in lower manganese yield than adding manganese Alloy Yield
[0006] (3) During the refining process, the manganese ore or manganese ore composite pellets added from the silo at the same time need a certain amount of time to melt, and the manganese ore absorbs heat and needs to consume some heat, so it is necessary to increase a certain amount of refining time, which will bring more impact on refining production scheduling. difficulty
[0007] Due to the above reasons, the application of direct alloying of manganese ore in steel mills is less

Method used

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  • Method for increasing yield of molten steel manganese in manganese ore direct-alloying

Examples

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Effect test

Embodiment 1

[0058] Manganese ore (TMn=42.8%, SiO 2 =16%, TFe=11.6%, P=0.13%, S=0.016%), lime, coke are used as raw materials after drying, crushing and grinding, and the ingredients (weight %) are: manganese ore 70%, lime 10% , coke 20%, the prepared material is used as a spare material of the manganese ore mixture after being mixed; meanwhile, aluminum powder is prepared, which is 30% of the amount of the manganese ore mixture. Use a thin steel belt to wrap the prepared manganese ore mixture and aluminum powder together, in which the aluminum powder is wrapped in the center with aluminum foil, and the manganese ore is wrapped in the periphery of the aluminum foil, and then the outside is pressed with a thin steel belt to make a diameter of 40mm and a length of 500mm , cored wire weighing 2.5kg.

[0059] In a 500kg level converter thermal simulation test furnace, load 200kg of scrap steel, induction heating to 1650 °C, take initial steel samples, measured [C] = 0.2%, [Si] = 0.4%, [Mn] = ...

Embodiment 2

[0062] Manganese ore (TMn=42.8%, SiO 2 =16%, TFe=11.6%, P=0.13%, S=0.016%), lime, coke are used as raw materials after drying, crushing and grinding, and the ingredients (weight %) are: manganese ore 80%, lightly burned 10% stone, 10% coke, the prepared material is mixed as a spare material for the manganese ore mixture; at the same time, aluminum powder is prepared to be 25% of the manganese ore mixture. Use aluminum foil to wrap the aluminum powder in the center, wrap the prepared manganese ore mixture on the periphery of the aluminum foil with a thin steel strip, and then press it tightly to make a cored wire with a diameter of 40mm, a length of 500mm, and a weight of 2.5kg.

[0063] In a 500kg-class converter heat simulation test furnace, load 200kg of scrap steel, induction heating to 1650 ° C, take the initial steel sample, measured [C] = 0.22%, [Si] = 0.34%, [Mn] = 0.3%, [ P] = 0.02%, [S] = 0.02%.

[0064] Insert 2 cored wires into the molten pool, and blow bottom-blo...

Embodiment 3

[0066] Manganese ore (TMn=42.8%, SiO 2 =16%, TFe=11.6%, P=0.13%, S=0.016%), lime, coke are used as raw materials after drying, crushing and grinding, and the ingredients (weight %) are: manganese ore 80%, lightly burned 10% stone, 10% anthracite, the prepared material is mixed and used as a spare material for the manganese ore mixture; at the same time, aluminum powder is prepared, which is 30% of the manganese ore mixture. Use a thin steel belt to wrap the prepared manganese ore mixture and aluminum powder together, in which the aluminum powder is wrapped in the center with aluminum foil, and the manganese ore is wrapped around the aluminum foil, and then pressed tightly to make a 40mm in diameter, 500mm in length and 2.5kg in weight cored wire.

[0067] In a 500kg-class converter thermal simulation test furnace, load 200kg of scrap steel, induction heating to 1650 ° C, take the initial steel sample, measured [C] = 0.25%, [Si] = 0.4%, [Mn] = 0.2%, [ P] = 0.02%, [S] = 0.02%....

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Abstract

The invention relates to a method for increasing yield of molten steel manganese in manganese ore direct-alloying and belongs to the technical field of molten steel alloying in steelmaking. The method includes drying, smashing and grinding manganese ore, lime or light-roasted dolomite, anthracite or coke and making into mixture as external powder according to the weight percentage of 50-90% of manganese ore, 0-20% of lime or light-roasted dolomite and 10-30% of anthracite or coke; making core-spun wires by using aluminum or silicone powder accounting for one third or one fourth of the mixture as internal powder, wrapping the internal powder by the external powder so as to form a wrapping layer on the internal powder; feeding the core-spun wires as steel ladle enters in the process of refining. By the method, high yield of manganese is achieved, heating time of a refining furnace is greatly shortened, and power consumption is reduced.

Description

technical field [0001] The invention belongs to the technical field of manganese alloying in converter or electric furnace steelmaking, in particular to a method for direct alloying of manganese ore, in particular to a method for improving the yield of manganese in direct alloyed steel with manganese ore. Background technique [0002] In order to reduce the cost of steelmaking, metallurgists have tried to conduct many beneficial discussions and researches in terms of raw materials and smelting processes. For example, direct alloying of steel with cheap primary products or oxide minerals instead of alloys is one of the methods. . Among many direct alloying processes, direct alloying of manganese ore has been highly valued. [0003] The direct alloying of manganese ore brings good benefits to iron and steel enterprises, but according to the current research results of manganese ore reduction in China, the effect of manganese ore reduction in the steelmaking process is not goo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00
Inventor 吴伟刘跃谭明祥吴东俊戴诗凡
Owner CENT IRON & STEEL RES INST
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