CN102689008A - Method of finish heat treatment of iron powder and apparatus for finish heat treatment - Google Patents

Method of finish heat treatment of iron powder and apparatus for finish heat treatment Download PDF

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Publication number
CN102689008A
CN102689008A CN2011102628613A CN201110262861A CN102689008A CN 102689008 A CN102689008 A CN 102689008A CN 2011102628613 A CN2011102628613 A CN 2011102628613A CN 201110262861 A CN201110262861 A CN 201110262861A CN 102689008 A CN102689008 A CN 102689008A
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iron powder
district
atmosphere
decarburization
moving bed
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阪口泰彦
前谷敏夫
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JFE Steel Corp
JFE Engineering Corp
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NKK Corp
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Abstract

A method and an apparatus for finish heat treatment of an iron powder are provided, with which it is possible to produce, with high productivity, an iron powder product having impurity concentrations within objective ranges regardless of the impurity concentrations of the crude iron powder. The method comprises: placing a crude iron powder on a continuous moving bed to continuously introduce the crude iron powder into the apparatus for finish heat treatment; firstly subjecting the crude iron powder in a pretreatment zone to a pretreatment in which the powder is heated to a temperature in the range of 450-1,100 C in a hydrogen gas and/or inert gas atmosphere; and then subjecting the pretreated powder to at least two of decarburization, deoxidation, and denitrification treatments in a decarburization zone, a deoxidation zone, and a denitrification zone. In the pretreatment zone, hydrogen gas and/or an inert gas is introduced as an ambient gas, separately from the ambient gas for use in the at least two treatments, into the upstream-side part of the pretreatment zone and discharged from the downstream-side part thereof so that the ambient gas flows in the same direction as the moving direction of the continuous moving bed.

Description

The final heat treatment method of iron powder and final annealing device
Technical field
It is metallurgical with iron powder or directly use the heat treatment of the iron powder of powder to the present invention relates to be used to make powder, and particularly rough iron powder is implemented in decarburization, deoxidation, the denitrogenation at least two kinds and handles and make the final annealing device that uses in the final heat treatment method of iron powder and this method of finished product iron powder.
Background technology
All the time, through being implemented final heat treatment, the rough iron powders such as crude iron powder of thick reduced iron powder that the thick reduction of mill tap is obtained, spray pattern process the finished product iron powder.In final heat treatment,, rough iron powder is implemented at least a processing in decarburization, deoxidation, the denitrogenation according to the purposes of finished product iron powder.Usually, final heat treatment uses mobile pool furnace to carry out continuously.
For example; Put down in writing a kind of heat treatment method of raw material iron powder in the patent documentation 1; Wherein, when in the atmosphere gas that mainly constitutes, the raw material iron powder being carried out continuous heat, make the heat-treating atmosphere temperature remain on 800~950 ℃ by hydrogen; And make heat treated preceding half section for decarburizing atmosphere, the second half section of containing the moisture 6 capacity % more than is the reducing atmosphere that contains the following moisture of 4 capacity %, thereby obtain reduced iron powder.
In addition; Put down in writing a kind of continous way in the patent documentation 2 and moved pool furnace; Wherein, Be provided with and move pool furnace with the partition of raw material direction of advance quadrature and be divided into a plurality of spaces, in this partition space, be provided with the gas flow path with the moving bed reverse flow, and be provided with gas stirring device on each top, space.In the technology that patent documentation 2 is put down in writing, use this continous way to move pool furnace and carry out the processing more than 2 kinds in decarburization, deoxidation or the denitrogenation continuously, carry out the final heat treatment of steel powder.In the technology that patent documentation 2 is put down in writing; The space that utilization was moved after cutting apart of pool furnace makes decarburization, deoxidation, each treatment process of denitrogenation independently; Thereby carrying out temperature control independently is to be to be 450~750 ℃ in 700~1100 ℃, denitrogenation operation in 600~1100 ℃, deoxidation step to reach in the decarbonization process, thereby carries out the final heat treatment of steel powder.
Fig. 2 show with patent documentation 2 in the continous way of record move the final annealing device of pool furnace homotype.Final annealing device shown in Figure 2 has: be divided into a plurality of districts, be the body of heater 30 in decarburization district 2, deoxidation district 3, denitrogenation district 4 by partition 1; Be located at the hopper 8 of the entrance side of body of heater 30; Be located at the wheel 10,10 of the outlet side of body of heater 30; The driving-belt 9 in each district along with these wheel 10 continuous rotations in the process body of heater 30; With radiant tube 11.Be fed into along with the continuous rotation of wheel 10 the rough iron powder 7 on the mobile continuously driving-belt 9 from hopper 8; When utilizing radiant tube 11 to be heated to move in each district 2,3,4 of proper temperature, accept heat treatment, processed finished product iron powder 71 by decarburization, deoxidation, denitrogenation.In the technology that patent documentation 2 is put down in writing, think that the reaction in each district is following.
In decarburization district 2, utilize radiant tube 11 that atmosphere temperature is controlled to be 600~1100 ℃, and be blown into mouthfuls 12 water vapour (H that import through water vapour from the downstream that is arranged on decarburization district 2 2O gas), will be adjusted into dew point from the atmosphere gas in deoxidation district 3: 30~60 ℃, thus rough powder is carried out decarburization.Upstream side in decarburization district 2 is provided with the outlet 6 of atmosphere gas, and atmosphere gas is discharged to outside the device.
In deoxidation district 3, utilize radiant tube 11 that atmosphere temperature is controlled to be 700~1100 ℃, and through the atmosphere gas (dew point: the hydrogen below 40 ℃), rough powder is carried out deoxidation from denitrogenation district 4.
In denitrogenation district 4, utilize radiant tube 11 that atmosphere temperature is controlled to be 450~750 ℃, and, rough powder is carried out denitrogenation from the hydrogen (dew point: below 40 ℃) that the atmosphere gas introducing port 5 in the downstream that is arranged on this denitrogenation district 4 imports as reacting gas.
Patent documentation 1: japanese kokai publication sho 52-156714 communique
Patent documentation 2: the special fair 01-40881 communique of Japan
But, with regard to the technology of record in the patent documentation 1,, have the problem that can not reduce nitrogen though can carry out decarburization, the deoxidation of rough iron powder.In addition; With regard to the technology of record in patent documentation 1 and the patent documentation 2; Under the many situation of C, the O content of rough iron powder; Therefore sometimes can not make C, O be reduced to target content through single treatment, once treating capacity reduces, or need carry out twice processing, thereby the problem that exists the productivity ratio of finished product iron powder to reduce.
Summary of the invention
The present invention has advantageously solved prior art problems; Its purpose is; No matter C as the rough iron powder of raw material iron powder, O, N concentration are provided how, can both be easily and stably the content of C, O and the N of finished product iron powder is adjusted to the final heat treatment method and the final annealing device of the iron powder of desired aimed concn.
The inventor to achieve these goals, to influence promote decarburization, deoxidation, denitrification reaction various factors carried out deep research.The result expects; For reduce the reaction load in decarburization in the final annealing device, deoxidation, each district of denitrogenation, utilize partition to divide be provided with as the space that can partly carry out decarburization, deoxidation, each reaction of denitrogenation, in final annealing device, carrying out pretreated zone (pretreating zone).Carried out more deep research then; The result finds; When rough iron powder was heated in inert gas or hydrogen atmosphere, in the temperature range more than 700 ℃, the C in the rough iron powder combined with O and following reaction takes place, thereby can reduce C, the O in the rough iron powder.
C (among the Fe)+FeO (s)=Fe (s)+CO (g)
And then expect, if in 450~750 ℃ temperature range, heat, and atmosphere gas is made as hydrogen, denitrification reaction then also takes place, therefore also can carry out denitrogenation.Under the situation of not hoping denitrogenation, atmosphere gas can be made as inert gas.
In addition; The inventor finds; The gas that uses as atmosphere gas in the pretreating zone is the gas that uses in new fresh gas that imports rather than the decarburization district etc., and therefore this need be provided with new atmosphere gas introducing port at the upstream side of pretreating zone for promoting that reaction is important.This be because, if contain CO gas, H in the atmosphere gas that uses in the pretreating zone 2Reaction such as O gas generates gas, and the reaction in the then above-mentioned pretreating zone is hindered, and has therefore expected the atmosphere gas that uses in the pretreating zone is made as CO gas, the H that does not contain as reaction generation gas 2The live gas of O gas.
The present invention is based on above-mentioned opinion and combines further research and accomplish.That is, purport of the present invention is following.
(1) a kind of final heat treatment method of iron powder; Rough iron powder is loaded on the continous way moving bed and said rough iron powder is implemented continuously that in decarburization, deoxidation, the denitrogenation at least 2 kinds are handled and when processing the finished product iron powder; Before said at least 2 kinds of processing, in advance said rough iron powder is implemented in the preliminary treatment of heating in hydrogen and/or the inert gas atmosphere.
At this, above-mentioned preliminary treatment also preferably is loaded into above-mentioned rough iron powder on the above-mentioned continous way moving bed and carries out, and then at least 2 kinds of processing in above-mentioned decarburization, deoxidation, the denitrogenation are implemented in this preliminary treatment.
(2) like the final heat treatment method of (1) described iron powder, wherein, the said pretreated said heating of in 450~1100 ℃ temperature range, carrying out in atmosphere temperature that is heated to be.
(3) like the final heat treatment method of (1) or (2) described iron powder; Wherein, The hydrogen and/or the inert gas that import as atmosphere gas in the said preliminary treatment; With with said at least 2 kinds of processing in the mode that flows of moving direction equidirectional of the different flow directions of the atmosphere gas ground, formation and the said continous way moving bed that use, import from the upstream side that carries out said pretreated zone, and discharge from the downstream.
(4) a kind of final annealing device of iron powder; It is provided with hopper, be contained in the rough iron powder of supplying with from said hopper and the moving bed that moves continuously in the inner space of body of heater and with the moving direction quadrature of said moving bed and the partition that said moving bed is provided with through ground; And be provided with 3 spaces that constitute by decarburization district, deoxidation district and denitrogenation district of dividing along its length by said partition that the inner space of said body of heater forms successively from upstream side along the moving direction of said moving bed; And; Be equipped with a plurality of radiant tubes in this space of heating in said 3 spaces separately, and, in said 3 spaces; Downstream in said denitrogenation district is provided with the atmosphere gas introducing port; Upstream side in said decarburization district is provided with the atmosphere gas outlet, between said 3 spaces, forms gas flow path with the mode with said moving bed reverse flow, and the water vapour that is provided with the dew point that is used to regulate atmosphere in the downstream in said decarburization district is blown into mouth; In said each space; Said rough iron powder is implemented final heat treatment, with the inner space of the said body of heater of the upstream side adjacency in said decarburization district in, further divide and form pretreating zone by the partition that said moving bed is passed through; Be equipped with a plurality of radiant tubes of this pretreating zone of heating in the said pretreating zone, and have preliminary treatment at the upstream side of said pretreating zone and use the atmosphere gas introducing port.
(5), wherein, the preliminary treatment of the upstream side that is equipped on said pretreating zone is set can import as the hydrogen of atmosphere gas and/or the mode of inert gas with the atmosphere gas introducing port like the final annealing device of (4) described iron powder.
The invention effect
According to the present invention, no matter how as the C of the rough iron powder of raw material iron powder, O, N concentration, can both be easily and stably make the finished product iron powder of desired target C, O, N concentration range with high production rate, on industry, given play to significant effect.In addition, the present invention also has the effect that stay-in-grade finished product iron powder can be provided.
Description of drawings
Fig. 1 is the side cross-sectional view of the final annealing device of pattern ground expression the present invention.
Fig. 2 is the side cross-sectional view of the existing final annealing device of pattern ground expression.
Label declaration
1 partition
2 decarburization districts
3 deoxidation districts
4 denitrogenation districts
5 atmosphere gas introducing ports
6 atmosphere gas outlets
7 rough iron powders
8 hoppers
9 driving-belts (moving bed continuously)
10 wheels
11 radiant tubes
12 water vapours are blown into mouth
14 jars
15 water sealed tanks
20 reducing mechanisms
21 coolers
22 circulating fans
30 bodies of heater
31 preliminary treatment spaces (pretreating zone)
The atmosphere gas introducing port is used in 50 preliminary treatment
71 finished product iron powders
The specific embodiment
Show to Fig. 1 pattern an example of final annealing device of the present invention.Final annealing device of the present invention is characterised in that; 3 spaces (being 2,3,4 among Fig. 1) that form by a plurality of partitions 1 division in moving bed 9 that has body of heater 30, hopper 8, in body of heater 30, moves continuously (being driving-belt among Fig. 1) and the body of heater 30, the upstream side in these 3 spaces with the moving direction quadrature of moving bed 9 also be provided with by partition 1 mark off be used for pretreated space, be pretreating zone 31.And, in 3 spaces 2,3,4 and the pretreating zone 31, also be equipped with a plurality of radiant tubes 11 that are used to heat certainly.In order to alleviate the load of the carbonization treatment of carrying out in 3 spaces after pretreating zone 31, deoxidation treatment, denitrogenation processing, the part of carbonization treatment, deoxidation treatment, denitrogenation processing is carried out in pretreating zone 31 as preliminary treatment.
The rough iron powder 7 that stores in the hopper 8 is supplied with and is loaded on the moving bed 9 by hopper 8, at first packs pretreating zone 31 into and implements preliminary treatment.In Fig. 1, moving bed 9 is designed to the driving-belt that can move continuously along with the one wheel pairs 10,10 that utilizes driver element (not shown) to rotate, but the present invention is not limited to this.Also can be designed as the mode that pallet is moved on pusher, roller.
Demarcate by partition 1 between each space in the above-mentioned body of heater 30, on each partition 1, be provided with the peristome that moving bed 9 can pass through.Through these peristomes; Can form the gas flow path of atmosphere gas between the space of adjacency; In the final annealing device of the present invention; The upstream side of the moving direction of 2 moving bed 9 sets atmosphere gas outlet 6 in the space, and preliminary treatment is set with atmosphere gas introducing port 50 at the upstream side of pretreating zone 31, and the atmosphere gas that uses in 3 spaces 2,3,4 is not flowed in the pretreating zone 31.And the peristome in the downstream through pretreating zone 31 is discharged the atmosphere gas after using.According to the processing of in pretreating zone 31, carrying out, will be made as inert gas and/or hydrogen with the gas that atmosphere gas introducing port 50 imports by the preliminary treatment that is provided with in the pretreating zone 31.And the atmosphere gas of the atmosphere gas after the use after in 3 spaces, using is discharged to outside the body of heater 30 by atmosphere gas outlet 6.
Final annealing device of the present invention; In order to carry out at least 2 kinds of processing in decarburization, deoxidation, the denitrogenation according to expectation; Be provided with 3 spaces (2,3,4); And then be fit to atmosphere temperature that each is handled for these 3 spaces are reached, set radiant tube 11 as heating unit can control the heating in each space independently.Thus, each reaction speed of handling increases, and can promptly implement the final heat treatment of desired iron powder.
Carry out in 3 spaces 2,3,4 in body of heater 30 under all decarburizations, deoxidation, each situation about handling of denitrogenation; Preferably as shown in Figure 1, with the downstream of pretreating zone 31 in abutting connection with ground, set gradually 3 spaces that constitute by decarburization district 2, deoxidation district 3, denitrogenation district 4 from the upstream side of the moving direction of moving bed 9.Order with such is configured, can be continuously and carry out each effectively and handle.And; Through atmosphere gas introducing port 5 being equipped on the downstream in denitrogenation district 4 and atmosphere gas outlet 6 being equipped on the upstream side in decarburization district 2; Gas is relatively flowed with the direction opposite with the moving direction that is loaded into the rough iron powder 7 on the moving bed 9, thereby the efficient of processing is improved.At this, same with patent documentation 2, import the reducibility gas (hydrogen) that is the main body with hydrogen etc. from atmosphere gas introducing port 5.And the downstream in decarburization district 2 is blown into water vapour and can regulates the water vapour of the dew point of atmosphere and be blown into mouthfuls 12 thereby be provided with in the atmosphere in decarburization district 2.
In addition,,, can end to be blown into mouthfuls 12 and be blown into water vapour, atmosphere temperature is adjusted to the temperature that is fit to deoxidation treatment and as the deoxidation district from water vapour in decarburization district 2 according to the composition of rough iron powder not under the situation of needs carbonization treatment.In addition, under the situation that does not need deoxidation treatment, deoxidation district 3 promptly can be used as the denitrogenation district as long as atmosphere temperature is adjusted to the temperature that is fit to denitrogenation processing.In addition, under the situation that does not need denitrogenation processing, denitrogenation district 4 promptly can be used as the deoxidation district as long as atmosphere temperature is adjusted to the temperature that is fit to deoxidation treatment.
Need to prove, in the final annealing device of the present invention, the not using gases in the hydrogen that is imported into, the water vapour, or the reaction that generates of reaction generate gas, be discharged to outside the body of heater 30 from atmosphere gas outlet 6 in the upstream side setting in decarburization district 2.In addition, implemented final heat treated finished product iron powder 71, utilized cooler 21 to cool off, and then be recycled blower fan 22 winding-up hydrogen and cool off.Then, be crushed to predetermined granularity through pulverizing with device 20, and be stored in the jar 14.In addition, do not hindered, made the atmosphere for keeping apart in the body of heater 30 through water sealed tank 15 grades and air atmosphere in order to make each above-mentioned processing reaction.
Among the present invention, preferably utilize the final annealing device of the invention described above that rough iron powder is implemented final heat treatment, thereby process the finished product iron powder.
Then, the final heat treatment method to iron powder of the present invention describes.
In the final heat treatment method of iron powder of the present invention, initial raw materials is the thick reduced iron powder that the thick reduction of mill tap is obtained, the rough iron powders such as crude iron powder of spray pattern.
Among the present invention; When will being loaded on the continous way moving bed as the rough iron powder of initial raw materials and it moved continuously; This rough iron powder is implemented at least 2 kinds of processing in preliminary treatment and carbonization treatment, deoxidation treatment, the denitrogenation processing, thereby process the finished product iron powder.Need to prove, in carbonization treatment, deoxidation treatment, the denitrogenation processing at least 2 kinds can suitably select according to the purposes of the C of rough iron powder, O, N concentration, finished product iron powder.
Among the present invention, preliminary treatment is for example carried out in pretreating zone shown in Figure 1 31, is the processing of removing impurity elements such as a part of carbon, oxygen or nitrogen in advance.The preliminary treatment of carrying out among the present invention; Before carbonization treatment, deoxidation treatment, each processing of denitrogenation processing, carry out; With each load of processing of denitrogenation processing that alleviates the carbonization treatment of in decarburization district 2, carrying out, the deoxidation treatment of in deoxidation district 3, carrying out, in denitrogenation district 4, carries out; Final heat treated productivity ratio is improved, thereby make the steady quality of finished product iron powder.
The preliminary treatment of carrying out among the present invention moves to and carries out after temperature is controlled in the pretreating zone 31 in the desired temperature range will supplying with and be loaded into rough iron powder 7 on the moving bed 9 by hopper 8.About pretreating zone 31, preferably be heated to 450~1100 ℃, and form hydrogen and/or inert gas atmosphere.And the dew point that will carry out the atmosphere in the pretreated pretreating zone 31 is made as below 40 ℃.
In this preliminary treatment, can carry out decarburization, deoxidation in the rough iron powder according to following reaction.
C (among the Fe)+FeO (s)=Fe (s)+CO (g)
S: solid, g: gas
As long as be heated to the temperature range more than 700 ℃, no matter then atmosphere gas is made as inert gas or hydrogen all this reaction can take place.And, in this preliminary treatment, owing to can when therefore atmosphere gas being made as hydrogen, can also carry out the denitrogenation of rough iron powder through 450~750 ℃ temperature range in the heating process according to following reaction.
N (among the Fe)+3/2H 2(g)=NH 3(g)
Therefore, hoping need atmosphere gas to be made as hydrogen under the situation of denitrogenation.
And, contain reaction generation gases such as CO gas if be used as the gas of the atmosphere gas of pretreating zone, then can hinder decarburization, deoxygenation in the above-mentioned preliminary treatment.Therefore; Make as the gas of the atmosphere gas of pretreating zone and newly import to the live gas that does not contain CO the pretreating zone 31 with atmosphere gas introducing port 50 for preliminary treatment from the upstream side that is arranged on pretreating zone 31; Rather than used atmosphere gas in the decarburization district in downstream etc., this is for promoting that the reaction in the preliminary treatment is extremely important.
In pretreating zone 31, implemented pretreated rough iron powder 7; Purposes according to C, N, O content and the finished product iron powder of rough iron powder; Further in decarburization district 2, deoxidation district 3, denitrogenation district 4, carry out at least 2 kinds of processing in carbonization treatment, deoxidation treatment, the denitrogenation processing respectively, thereby process the finished product iron powder.
In decarburization district 2; Utilize radiant tube 11 that atmosphere temperature is controlled to be 600~1100 ℃, and be blown into mouthfuls 12 water vapour (H that import through adding the reducibility gas of sending here through the peristome of partition 1 to deoxidation district 3 (hydrogen) that is the main body with hydrogen etc. from water vapour from the downstream 2O gas), dew point is adjusted to 30~60 ℃, thereby carries out the carbonization treatment of rough iron powder.In the decarburization district 2, can carry out the decarburization of rough iron powder according to reactions.
C (among the Fe)+H 2O (g)=CO (g)+H 2(g)
In addition; In deoxidation district 3; Utilize radiant tube 11 that atmosphere temperature is controlled to be 700~1100 ℃; And the atmosphere gas of sending here through the peristome of partition 1 through the denitrogenation district 4 from the downstream (reducibility gas (hydrogen) that is the main body with the hydrogen of dew point below 40 ℃, below the preferred room temperature etc.), carry out the deoxidation treatment of rough iron powder.And, in the deoxidation district 3, can carry out deoxidation according to the reactions formula.
FeO(s)+H 2(g)=Fe(s)+H 2O(g)
In addition, in denitrogenation district 4, utilize radiant tube 11 that atmosphere temperature is controlled to be 450~750 ℃, and, carry out the denitrogenation processing of rough iron powder through import the reducibility gas that is the main body with hydrogen etc. from the atmosphere gas introducing port that is arranged on this downstream, district 5.And, in the denitrogenation district 4, can carry out denitrogenation according to the reactions formula.
N (among the Fe)+3/2H 2(g)=NH 3(g)
Below, further specify the present invention based on embodiment.
[embodiment]
(embodiment 1)
Use of the present invention final annealing device shown in Figure 1, the rough iron powder A of impurity element shown in the table 2 (C, O, N) content, B, C, D as initial raw materials, are implemented final heat treatment under the condition shown in the table 1, process the finished product iron powder.Need to prove that using particle diameter as the rough iron powder of initial raw materials is the water-atomized iron powder below the 100 μ m.
As the present invention's example; These rough iron powders are supplied on the driving-belt 9 as continuous moving bed from hopper 8; Be loaded into thick 40mm, carry out continuously then by the carbonization treatment in preliminary treatment in the pretreating zone 31 and the decarburization district 2, the deoxidation treatment in the deoxidation district 3, the final heat treatment that denitrogenation processing in the denitrogenation district 4 constitutes.Kind and flow, the charge weight of the treatment temperature in each district, importing gas are recorded in table 1 in the lump.And; Atmosphere gas in decarburization district 2, deoxidation district 3, the denitrogenation district 4; Import from the atmosphere gas introducing port 5 of configuration in the downstream in denitrogenation district 4, and to be supplied to each district with the mode of the moving direction reverse flow of driving-belt 9, the gas flow path that is situated between by the peristome of the partition through each district.And, with the situation of not using pretreating zone 31 as comparative example.
Analyze resulting finished product iron powder, obtain phosphorus content, oxygen content, nitrogen content.In addition, the impurity content of the finished product iron powder of heat treatment No.4 is made as a reference value, the quality evaluation of impurity content being compared the finished product iron powder under the significantly high situation with it for poor *, be zero with the quality evaluation of the finished product iron powder under other situation.In the present embodiment, the charge weight of unit of adjustment's time is so that the quality of finished product iron powder reaches zero.
At this, be benchmark (1.00) with the charge weight of heat treatment No.4, will compare with it productivity ratio under situation (less than 0.90) that the charge weight (output) of unit interval significantly reduces be evaluated as poor *, the productivity ratio under other situation is evaluated as zero.
The result of gained is shown in table 2.
Figure BSA00000571579300131
With regard to the present invention's example; Impurity content has the rough iron powder of increase slightly even packed into; Also all can under the situation that the charge weight that does not make the unit interval (output) reduces, the content of carbon, oxygen, nitrogen be reduced to below the desired scope, thus can be with the good finished product iron powder of high production rate workmanship.Relative therewith; The comparative example that breaks away from the scope of the invention; Though can under the situation that the charge weight that does not make the unit interval (output) reduces, make impurity content be reduced to (as the No.4 of benchmark) below the desired scope under the low situation of the impurity content of rough iron powder; But when the impurity content of rough iron powder increases, significantly reduce, obtain impurity content and reduce to the desired following finished product iron powder of scope through the charge weight (output) that for example makes the unit interval.
Utilizability on the industry
According to the present invention, no matter how as the C of the rough iron powder of raw material iron powder, O, N concentration, can both be easily and stably make the finished product iron powder of desired target C, O, N concentration range with high production rate, on industry, given play to significant effect.In addition, the present invention also has the effect that stay-in-grade finished product iron powder can be provided.

Claims (5)

1. the final heat treatment method of an iron powder; Rough iron powder is loaded on the continous way moving bed and said rough iron powder is implemented continuously that in decarburization, deoxidation, the denitrogenation at least 2 kinds are handled and when making the finished product iron powder; Before said at least 2 kinds of processing, in advance said rough iron powder is implemented in the preliminary treatment of heating in hydrogen and/or the inert gas atmosphere.
2. the final heat treatment method of iron powder as claimed in claim 1, wherein, the said pretreated said heating of in 450~1100 ℃ temperature range, carrying out in atmosphere temperature that is heated to be.
3. according to claim 1 or claim 2 the final heat treatment method of iron powder; Wherein, The hydrogen and/or the inert gas that import as atmosphere gas in the said preliminary treatment; With with said at least 2 kinds of processing in the mode that flows of moving direction equidirectional of the different flow directions of the atmosphere gas ground, formation and the said continous way moving bed that use, import from the upstream side that carries out said pretreated zone, and discharge from the downstream.
4. the final annealing device of an iron powder; It is provided with hopper; Loading is from the rough iron powder of said hopper supply and the moving bed that moves continuously in the inner space of body of heater; With with the moving direction quadrature of said moving bed and partition that said moving bed is provided with through ground; And along the moving direction of said moving bed from upstream side be provided with successively by said partition divide along its length that the inner space of said body of heater forms by the decarburization district; 3 spaces that deoxidation district and denitrogenation district constitute; And; Be equipped with a plurality of radiant tubes in this space of heating in said 3 spaces separately
And, in said 3 spaces, be provided with the atmosphere gas introducing port in the downstream in said denitrogenation district; Upstream side in said decarburization district is provided with the atmosphere gas outlet; Between said 3 spaces, form gas flow path, and the water vapour that is provided with the dew point that is used to regulate atmosphere in the downstream in said decarburization district is blown into mouth, in said each space with mode with said moving bed reverse flow; Said rough iron powder is implemented final heat treatment
With the inner space of the said body of heater of the upstream side adjacency in said decarburization district in; Further divide and form pretreating zone by the partition that said moving bed is passed through; Be equipped with a plurality of radiant tubes of this pretreating zone of heating in the said pretreating zone, and have preliminary treatment at the upstream side of said pretreating zone and use the atmosphere gas introducing port.
5. the final annealing device of iron powder as claimed in claim 4 wherein, sets with the atmosphere gas introducing port preliminary treatment of the upstream side that is equipped on said pretreating zone can import as the hydrogen of atmosphere gas and/or the mode of inert gas.
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CN105021033A (en) * 2014-04-28 2015-11-04 三星电机株式会社 Firing furnace
CN105121069A (en) * 2013-04-19 2015-12-02 杰富意钢铁株式会社 Iron powder for dust core and insulation-coated iron powder for dust core
CN112404449A (en) * 2020-10-23 2021-02-26 中国科学技术大学 Device and method for continuously synthesizing powder material based on thermal shock

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