CN104630566B - Ferro-nickel alloy and preparation method thereof - Google Patents

Abstract

The invention discloses a ferro-nickel alloy and a preparation method thereof. The ferro-nickel alloy comprises the following components in percentage by weight: 38-50% of Ni, 0.8-1.5% of C, 0.5-1.5% of Si, 0.03-0.10% of P, 0.01-0.05% of S, 1-2.5% of Cr, 0.5-1.0% of Co and the balance of Fe. The preparation method comprises the steps of (1) mixing and pelleting; (2) reducing; (3) smelting, namely firstly carrying out solid phase sintering on the a metalized pellet at the temperature of 1000-1350 DEG C for 4-6 days, further heating to 1500-1750 DEG C, and smelting for 1-3 hours to obtain crude ferro-nickel alloy; and (4) refining, namely refining the crude ferro-nickel alloy, adding basic oxide accounting for 2.5-3.5% of the weight of the crude ferro-nickel alloy while refining to obtain refined molten ferro-nickel, and then, pouring to obtain a refined ferro-nickel alloy product, wherein the refining temperature is 1500-1700 DEG C, the refining period is 30-50 minutes, and the oxygen blowing quantity is 100-200Nm＜3＞/t. The ferro-nickel alloy and the preparation method thereof have the advantages that the prepared ferro-nickel alloy is high in density and purity and good in strength, toughness and wear resistance; and the preparation method is simple, low in production cost and remarkable in energy-saving and emission-reduction effects.

Description

A kind of dilval and preparation method thereof

Technical field

The present invention relates to technical field of iron alloy, more particularly, to a kind of dilval and preparation method thereof.

Background technology

Ferroalloy, the ferroalloy of broad sense refers to add as deoxidier, element additive etc. during steel-making makes steel have in molten iron Certain characteristic standby or a kind of product reaching certain requirement, iron and the intermediate alloy of one or more elements composition, are mainly used in Smelting iron and steel.Nickel can be melt into dilval with iron, form the light-alloy of high intensity, have a wide range of applications in every respect.At present The conventional method producing dilval the domestic nickel ore from nickeliferous 1.5-2.5% is mainly sintered using nickel minerals, Make solvent with lime, make reducing agent with coke and carry out the prepared dilval product of selective reduction in ore-smelting electric furnace, for producing Stainless steel uses, and its traditional processing technology is more complicated, and low production efficiency, sintering circuit coke consumption are high, and lime was producing Easy efflorescence in journey, coke price is expensive, and costly, pollution is big.

Content of the invention

The purpose of the present invention is to overcome the deficiencies in the prior art, provides a kind of dilval and preparation method thereof, preparation Dilval density and purity are high, and intensity, toughness and abrasive resistance are good, and preparation method is simple, and production efficiency is high, and production cost Low, effects of energy saving and emission reduction is notable.

The present invention adopts the following technical scheme that to achieve these goals

A kind of dilval, its composition content by weight percentage is: ni 38-50%, c 0.8-1.5%, si 0.5-1.5%, p 0.03-0.10%, s 0.01-0.05%, cr 1-2.5%, co 0.5-1.0%, balance of iron.

The uniformity on described dilval surface is less than 5%.

The surface brightness of described dilval is one-level light.

The preparation method of described dilval, comprises the following steps:

(1) batch mixing, pressure ball: it is below 10mm that nickel oxide ores are crushed to granularity, is subsequently adding its weight 5-10% Coal dust, the bonding agent of 0.8-1.5%, the pulverized limestone of 3-5%, the water cobaltous sulfate mixing of 0.5-1.0%, are pressed into pelletizing, control Pelletizing moisture is in 8-10%；

(2) reduce: obtain metallized pellet by carrying out reduction in the pelletizing made feeding rotary hearth furnace, reduction temperature is 1300-1500 DEG C, the recovery time is 1-3 hour；

(3) melting: metallized pellet is first carried out solid-phase sintering 4-6 hour at a temperature of 1000-1350 DEG C, then proceedes to It is heated to 1500-1750 DEG C and carries out melting 1-3 hour, obtain thick dilval；

(4) refine: thick dilval is adopted aod refining furnace to refine, during refining, adds the alkalescence of its weight 2.5-3.5% Oxide, obtains smart ferronickel water, and refining temperature is 1500-1700 DEG C, and refining cycle is 30-50min/ stove, and blowing oxygen quantity is 100- 200nm³/ t, then obtain Refining Nickel ferroalloy productor through casting.

Bonding agent described in step (1) is waterglass or pva.

Basic anhydride described in step (4) are lime stone, fluorite.

Compared with the prior art, beneficial effects of the present invention are as follows:

Dilval of the present invention and preparation method thereof, the dilval density of preparation and purity are high, intensity, toughness and resistance to Mill ability is good, and preparation method is simple, and production efficiency is high, coal blending powder pelletizing in raw material, and the recovery time is short, and energy consumption is low, and dust is few, The useful element rate of recovery is high, adopts two-step sintering method during melting, controls the deformation in melting for the dilval, improves dilval Density, purity, the various performance requirements such as internal microstructure, low production cost, effects of energy saving and emission reduction is notable.

Specific embodiment

The present invention is further illustrated with reference to embodiments, but the present invention is not limited only to these embodiments, not On the premise of departing from present inventive concept, any improvement made is within the scope of the present invention.

Embodiment 1:

A kind of dilval, its composition content by weight percentage is: ni 38-50%, c 0.8-1.5%, si 0.5-1.5%, p 0.03-0.10%, s 0.01-0.05%, cr 1-2.5%, co 0.5-1.0%, balance of iron.Described The uniformity on dilval surface is less than 5%, and surface brightness is one-level light.

The preparation method of described dilval, comprises the following steps:

(1) batch mixing, pressure ball: it is below 10mm that nickel oxide ores are crushed to granularity, is subsequently adding its weight 5-10% Coal dust, the bonding agent of 0.8-1.5%, the pulverized limestone of 3-5%, the water cobaltous sulfate mixing of 0.5-1.0%, are pressed into pelletizing, control Pelletizing moisture is 8%；Described bonding agent is waterglass.

(2) reduce: obtain metallized pellet by carrying out reduction in the pelletizing made feeding rotary hearth furnace, reduction temperature is 1300 DEG C, the recovery time is 3 hours；

(3) melting: metallized pellet is first carried out solid-phase sintering 6 hours at a temperature of 1000 DEG C, then proceedes to be heated to 1500 DEG C carry out melting 3 hours, obtain thick dilval；

(4) refine: thick dilval is adopted aod refining furnace to refine, during refining, adds the alkalescence of its weight 2.5-3.5% Oxide, obtains smart ferronickel water, and refining temperature is 1500 DEG C, and refining cycle is 50min/ stove, and blowing oxygen quantity is 100nm³/ t, then warp Cross casting and obtain Refining Nickel ferroalloy productor.Described basic anhydride are lime stone, fluorite.

Embodiment 2:

A kind of dilval, its composition content by weight percentage is: ni 38-50%, c 0.8-1.5%, si 0.5-1.5%, p 0.03-0.10%, s 0.01-0.05%, cr 1-2.5%, co 0.5-1.0%, balance of iron.

The preparation method of described dilval, comprises the following steps:

(1) batch mixing, pressure ball: it is below 10mm that nickel oxide ores are crushed to granularity, is subsequently adding its weight 5-10% Coal dust, the bonding agent of 0.8-1.5%, the pulverized limestone of 3-5%, the water cobaltous sulfate mixing of 0.5-1.0%, are pressed into pelletizing, control Pelletizing moisture is 10%；Described bonding agent is pva.

(2) reduce: obtain metallized pellet by carrying out reduction in the pelletizing made feeding rotary hearth furnace, reduction temperature is 1500 DEG C, the recovery time is 1 hour；

(3) melting: metallized pellet is first carried out solid-phase sintering 4 hours at a temperature of 1350 DEG C, then proceedes to be heated to 1750 DEG C when carrying out melting 1, obtain thick dilval；

(4) refine: thick dilval is adopted aod refining furnace to refine, during refining, adds the alkalescence of its weight 2.5-3.5% Oxide, obtains smart ferronickel water, and refining temperature is 1700 DEG C, and refining cycle is 30min/ stove, and blowing oxygen quantity is 200nm³/ t, then warp Cross casting and obtain Refining Nickel ferroalloy productor.Described basic anhydride are lime stone, fluorite.

Claims (6)

1. a kind of dilval it is characterised in that: its composition content by weight percentage is: ni 38-50%, c 0.8- 1.5%th, si 0.5-1.5%, p 0.03-0.10%, s 0.01-0.05%, cr 1-2.5%, co 0.5-1.0%, balance of Iron；

The preparation method of described dilval it is characterised in that: comprise the following steps:

(1) batch mixing, pressure ball: by nickel oxide ores be crushed to granularity be below 10mm, be subsequently adding its weight 5-10% coal dust, The bonding agent of 0.8-1.5%, the pulverized limestone of 3-5%, the water cobaltous sulfate mixing of 0.5-1.0%, are pressed into pelletizing, control pelletizing water Divide in 8-10%；

(2) reduce: obtain metallized pellet by carrying out reduction in the pelletizing made feeding rotary hearth furnace, reduction temperature is 1300- 1500 DEG C, the recovery time is 1-3 hour；

(3) melting: metallized pellet is first carried out solid-phase sintering 4-6 hour at a temperature of 1000-1350 DEG C, then proceedes to heat Carry out melting 1-3 hour to 1500-1750 DEG C, obtain thick dilval；

(4) refine: thick dilval is adopted aod refining furnace to refine, during refining, adds the alkaline oxygenated of its weight 2.5-3.5% Thing, obtains smart ferronickel water, and refining temperature is 1500-1700 DEG C, and refining cycle is 30-50min/ stove, and blowing oxygen quantity is 100- 200nm³/ t, then obtain Refining Nickel ferroalloy productor through casting.

2. dilval according to claim 1 it is characterised in that: the uniformity on described dilval surface is less than 5%.

3. dilval according to claim 1 it is characterised in that: the surface brightness of described dilval be one-level light Bright.

4. a kind of preparation method of dilval as claimed in claim 1 it is characterised in that: comprise the following steps:

(1) batch mixing, pressure ball: by nickel oxide ores be crushed to granularity be below 10mm, be subsequently adding its weight 5-10% coal dust, The bonding agent of 0.8-1.5%, the pulverized limestone of 3-5%, the water cobaltous sulfate mixing of 0.5-1.0%, are pressed into pelletizing, control pelletizing water Divide in 8-10%；

(2) reduce: obtain metallized pellet by carrying out reduction in the pelletizing made feeding rotary hearth furnace, reduction temperature is 1300- 1500 DEG C, the recovery time is 1-3 hour；

(3) melting: metallized pellet is first carried out solid-phase sintering 4-6 hour at a temperature of 1000-1350 DEG C, then proceedes to heat Carry out melting 1-3 hour to 1500-1750 DEG C, obtain thick dilval；

(4) refine: thick dilval is adopted aod refining furnace to refine, during refining, adds the alkaline oxygenated of its weight 2.5-3.5% Thing, obtains smart ferronickel water, and refining temperature is 1500-1700 DEG C, and refining cycle is 30-50min/ stove, and blowing oxygen quantity is 100- 200nm³/ t, then obtain Refining Nickel ferroalloy productor through casting.

5. dilval according to claim 4 preparation method it is characterised in that: the bonding agent described in step (1) For waterglass or pva.

6. dilval according to claim 4 preparation method it is characterised in that: alkaline oxygenated described in step (4) Thing is lime stone, fluorite.