An additive for suppressing high-temperature volatilization of molybdenum oxide briquettes, molybdenum oxide briquettes and their preparation and application

A technology of molybdenum oxide and additives, which is applied in the field of molybdenum oxide direct alloying steelmaking, which can solve the problems of low enthusiasm for the application of molybdenum oxide direct alloying, increased molybdenum yield, and large initial volatilization.

Active Publication Date: 2020-10-30
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the inhibitor is used at high temperature, the initial volatilization of molybdenum trioxide is large, and the inhibitor cannot quickly capture molybdenum oxide, resulting in partial loss, and the yield of molybdenum is only slightly increased, which still cannot meet the requirements of iron and steel enterprises, resulting in The enthusiasm for direct alloying of molybdenum oxide is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Prepare an additive for suppressing high-temperature volatilization of molybdenum oxide briquettes. The chemical composition and weight percentage content in the additive are: barium carbonate accounts for 6.68% of the total mass of the additive, calcium oxide accounts for 93.32% of the total mass of the additive, and the corresponding BaO content is 5%, the CaO content is 90% of the total mass of the additive, and the particle size of barium carbonate and calcium oxide is required to be controlled below 1.500mm.

[0023] In an 80-ton electric furnace, 20CrNiMoH steel containing 0.15wt-0.25wt% molybdenum is smelted. After each component of the additive is weighed according to the above formula content, the additive is uniformly mixed to obtain the additive; in the molybdenum oxide block, the amount of the additive is 5% of the quality of the molybdenum oxide (pure substance), and the amount of the reducing agent (carbon powder) is 5% of the molybdenum oxide (pure substa...

Embodiment 2

[0025] Prepare an additive for suppressing high-temperature volatilization of molybdenum oxide briquettes. The chemical composition and weight percentage of the additive are as follows: barium carbonate accounts for 23.01% of the total mass of the additive, barium sulfate accounts for 32.09% of the total mass of the additive, and calcium carbonate accounts for 44.90% of the total mass of the additive. , the corresponding BaO content is 48% of the total mass of the additive, the CaO content is 31% of the total mass of the additive, and the particle size of barium carbonate, barium sulfate and calcium carbonate is required to be controlled below 1.500mm.

[0026] In an 80-ton electric furnace, high-molybdenum alloy steel grades containing 2wt% to 4wt% molybdenum are smelted. After each component of the additive is weighed according to the above formula content, the additive is uniformly mixed to obtain the additive; in the molybdenum oxide block, the addition amount of the additi...

Embodiment 3

[0028] Prepare an additive for suppressing high-temperature volatilization of molybdenum oxide briquettes. The chemical composition and weight percentage content of the additive are as follows: barium carbonate accounts for 80.34% of the total mass of the additive, calcium oxide accounts for 19.66% of the total mass of the additive, and the corresponding BaO content is 1.5% of the total mass of the additive. 73%, the CaO content is 23% of the total mass of additives, and the particle size of barium carbonate and calcium oxide is required to be controlled below 1.500mm.

[0029] In an 80-ton electric furnace, 22CrMoH steel containing 0.35wt-0.45wt% molybdenum is smelted. After each component of the additive is weighed according to the above formula content, the additive is uniformly mixed to obtain the additive; in the molybdenum oxide block, the amount of the additive is 35% of the quality of the molybdenum oxide (pure substance), and the amount of the reducing agent (ferrosili...

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Abstract

The invention mainly relates to the problem of volatile molybdenum oxide in steel-making of molybdenum through direct alloying, and discloses an additive for inhibiting high-temperature volatilizationof a molybdenum oxide pressing block, the molybdenum oxide pressing block, preparation and application of the molybdenum oxide pressing block. The additive is mainly composed of a barium-contained compound (the BaO content is 5-85%) and a calcium-contained compound (the CaO content is 10-90%). The additive is completed by being pressed together with the molybdenum oxide and a reducing agent in acertain proportion and particle size and then mixing in molten steel for smelting, the operating cost is low, the volatilization loss amount of the molybdenum oxide can be decreased, and then the molybdenum yield of alloy steel is increased; and the characteristics of low smelting energy consumption and low smelting cost are achieved.

Description

technical field [0001] The invention belongs to the field of molybdenum oxide direct alloying steelmaking, and mainly relates to an additive for suppressing high-temperature volatilization of molybdenum oxide briquettes, a molybdenum oxide briquette and its preparation and application. Background technique [0002] The application of molybdenum in the steel industry still occupies a leading position in consumption, accounting for about 80%. Among them, cast iron and roll are about 6%, tool steel and high-speed steel are about 8%, stainless steel is about 23%, and alloy steel is about 43%. As an alloying element of steel, molybdenum can improve the repassivation ability of steel, thereby improving the pitting corrosion resistance and crevice corrosion resistance of stainless steel, improving the high temperature resistance strength of steel, and making the high temperature durability and creep performance of steel greater. Improve, improve the acid and alkali resistance, wea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/00C22C33/04
Inventor 邢相栋王莎庞焯刚邵久刚吕明张秋利刘文果唐琛妹莫川
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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