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An Electric Furnace Steelmaking Process for Simultaneous Direct Alloying of Manganese Oxide and Molybdenum Oxide

An electric furnace steelmaking and molybdenum oxide technology, which is applied in the direction of electric furnace, process efficiency improvement, furnace, etc., can solve the problems of reducing the yield of molybdenum element, improve economic and environmental benefits, reduce smelting links, and reduce the amount of slag Effect

Inactive Publication Date: 2019-01-18
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At steelmaking temperature, if no protective measures are taken, 70% MoO 3 Will turn into gas and reduce the yield of molybdenum

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: Smelting 022Cr19Ni5Mo3Si2N stainless steel

[0031] An electric furnace steelmaking method for simultaneous direct alloying of manganese oxide and molybdenum oxide, using a 30t electric arc furnace to smelt 022Cr19Ni5Mo3Si2N stainless steel (the manganese content of the steel grade is 1%, and the molybdenum content is 3%). The electric furnace smelting process of the molten steel composition includes the following step:

[0032] (1) Ingredients: firstly prepare the materials for direct alloying, and sieve the molybdenum calcined sand to obtain 1.75 tons of molybdenum calcined sand with a particle size of more than 100 mesh (the molybdenum content is 51.3%); prepare 0.7 tons of manganese-rich ore (the manganese content is 43.1%) %), graphite powder (with a carbon content of 98.7%) whose particle size is below 0.5mm and 410kg after crushing; mix molybdenum calcined sand, manganese-rich ore and graphite powder, and make it as a direct alloying mixture for subseq...

Embodiment 2

[0033] Embodiment 2: Smelting 12Cr12Mo heat-resistant steel

[0034] An electric furnace steelmaking method for simultaneous direct alloying of manganese oxide and molybdenum oxide, using a 30t electric arc furnace to smelt 12Cr12Mo heat-resistant steel (the manganese content of the steel type is 0.5wt%, and the molybdenum content is 0.6wt%), and the electric furnace of the molten steel composition The smelting process includes the following steps:

[0035](1) Ingredients: first prepare the materials for direct alloying, and sieve the molybdenum calcined sand to obtain 350 kg of molybdenum calcined sand with a particle size of more than 100 mesh (the molybdenum content is 51.3%); prepare 360 ​​kg of manganese-rich ore (the manganese content is 43.1%) , particle size is the graphite powder (carbon content is 98.7%) below 0.5mm and 100kg after crushing; Molybdenum calcined sand, manganese-rich ore and graphite powder are mixed, and it is standby to make direct alloying mixture; ...

Embodiment 3

[0036] Embodiment 3: 008Cr30Mo2 stainless steel

[0037] An electric furnace steelmaking method for simultaneous direct alloying of manganese oxide and molybdenum oxide, using a 30t electric arc furnace to smelt 008Cr30Mo2 stainless steel (the manganese content of the steel type is 0.3wt%, and the molybdenum content is 2.0wt%), and the electric furnace smelting process of the molten steel composition Include the following steps:

[0038] (1) Ingredients: First prepare the materials for direct alloying, namely: ①1.17t molybdenum calcined sand with a particle size of 100 mesh or more and a molybdenum content of 51.3%; ②210kg manganese-rich ore with a manganese content of 43.1% and a particle size of 0.5 after crushing mm or less, ③380kg of 75% ferrosilicon powder (silicon content is 75wt%); molybdenum calcined sand, manganese-rich ore and graphite powder are mixed to make a direct alloy mixture for subsequent use; then prepare other raw materials, such as steel scrap and other ...

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Abstract

The invention discloses an electric furnace steel making process capable of simultaneously and directly alloying manganese oxide and molybdenum oxide, and belongs to the technical field of steel making. The making process comprises the following steps: material preparation: preparing the manganese oxide, the molybdenum oxide, a reducing agent and other raw materials according to a requirement of the type of steel to be smelted; fettling; loading: firstly, adding backing materials such as lime, small powder and light and thin materials into the bottom of an electric furnace, then crushing and uniformly mixing manganese oxide, the molybdenum oxide and the reducing agent to obtain a mixture, adding the mixture into the electric furnace in a manner that the mixture is placed above the backing materials, adding waste steel, and finally adding molten iron for mixing; melting: melting solid furnace burdens into liquid; smelting in an oxidizing period and a reducing period; and steel tapping. The electric furnace steel making process has the advantages that the operations are easy, manganese and molybdenum elements are effectively used, the production cost is reduced, discharge of CO2 is reduced, and the economical and environmental benefits are increased.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular relates to an electric furnace steelmaking process in which manganese oxide and molybdenum oxide are simultaneously directly alloyed. Background technique [0002] Using oxides instead of ferroalloys for steelmaking can reduce production costs. Domestic and foreign researchers have conducted a lot of research on the direct alloying of manganese oxide and molybdenum oxide for steelmaking. On the basis of these studies, manganese oxide direct alloying technology and molybdenum oxide direct alloying technology have been widely developed. [0003] Manganese oxide direct alloying process can be used in converter, RH refining furnace, vacuum induction furnace (manganese ore direct alloying is applied to converter steelmaking process, CN105838843A; a kind of method of vacuum induction furnace plus manganese ore direct alloying, CN105483321A; a kind of RH refining process plus mang...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/52
CPCC21C5/52Y02P10/20
Inventor 马登吴巍
Owner CENT IRON & STEEL RES INST