CN103736987A - Method for performing direct passivation on micro-fine metal powder on hydrogen reduction production line - Google Patents
Method for performing direct passivation on micro-fine metal powder on hydrogen reduction production line Download PDFInfo
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- CN103736987A CN103736987A CN201310723091.7A CN201310723091A CN103736987A CN 103736987 A CN103736987 A CN 103736987A CN 201310723091 A CN201310723091 A CN 201310723091A CN 103736987 A CN103736987 A CN 103736987A
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Abstract
The invention belongs to the powder metallurgical powder manufacturing field and particularly relates to a method for performing direct passivation on micro-fine metal powder on a hydrogen reduction production line. The method comprises the steps of A, connecting the passivation section behind the cooling section of a common tube type hydrogen reduction furnace, wherein the passivation section is free of heating or cooling device and the length of the passivation section is one half to four fifths of the length of the reduction section; B, forming three passivation gas inlets in the passivation section, wherein the three passivation gas inlets are located at the position of the head portion, the one fourth position and the three fifths position of the passivation section respectively; C, communicating the passivation gas which is the air or the oxygen gas into the three passivation gas inlets in the production process, wherein the communicated passivation gas is 0.1 to 1% of the reducing gas flow; D, forming the diffusing opening with a valve on the tail portion of the passivation section and adjusting the diffusing gas flow to be one fifth to one third of the reducing gas flow; E, connecting an automatic discharging box to the tail portion of the passivation section, wherein the inclined angle is 60 degrees. Compared with the prior art, the method for performing direct passivation on the micro-fine metal powder on the hydrogen reduction production line has the advantages of being small in investment, low in cost, wide in applicability, simple in production process and suitable for mass production.
Description
Technical field
The invention belongs to powder metallurgy powder and manufacture field, particularly the method for direct passivation refining metallic powder on hydrogen reduction production line.
Background technology
Refining metallic powder has very high activity, is very easily oxidized even spontaneous combustion in air.In order to preserve refining metallic powder, conventionally take following several method: (1) preserves under vacuum or condition of nitrogen gas; (2) in organic solvent, preserve; (3) adopt organic surface active agent parcel refining metallic powder; (4) high temperature sintering is again through ball milling; (5) use weak oxide atmosphere to carry out Passivation Treatment to refining metallic powder surface.Method (1), (2) are difficult to industrial applications; Method (3) can make refining metallic powder be polluted; Method (4) alligatoring powder particle, changed the physical chemistry attribute of refining metallic powder; Method (5) is workable, in industrial production, be widely used, but the method need to complete in special paralysis facility, and will consume a large amount of inert gas (as nitrogen, argon gas, carbon dioxide etc.).
Summary of the invention
The invention provides a kind of invest little, cost is low, applicability is wide, production process is simple, be suitable for the method for the passivation refining metallic powder produced in enormous quantities.
According to above-mentioned purpose, principle of the present invention is:
To add micro amount of oxygen can passivation refining metallic powder the same with inert gas, and in reduction furnace, the reducing gas (hydrogen or decomposed ammonia) of itself adds micro amount of oxygen and also can reach same passivation effect.Our test has also proved this point.For this reason, we have increased passivation section after the cooling section of common reduction furnace, to pass into micro-air or oxygen.At room temperature, the refining metallic powder particle surface that oxygen can be high with the activity formation passivating film that reacts, and hydrogen can not reduce any metal oxide at this temperature.So at room temperature reducing gas adds micro amount of oxygen and not only can make refining metallic powder particle surface form passivating film, and passivating film is stable.Because the temperature of passivation section is room temperature, the concentration of oxygen is minimum in addition, the possibility that hydrogen is not blasted.In addition, because tube furnace internal gas pressure is for just, and there is partial reduction air-flow to the discharge of passivation segment trailer diffusion mouth, so oxygen also can not flow to reduction section through cooling section.
In order to realize foregoing invention object, concrete technical scheme of the present invention comprises following concrete measure:
A. continued access passivation section after common tubular type hydrogen reduction furnace cooling section, passivation section is without heating or cooling device, and length is 1/2 ~ 4/5 of reduction section length.
B. passivation section has three passivating gas air inlets, lays respectively at forefront, 1/4 place and 3/5 place of passivation section.
C. passivating gas is air or oxygen, passes into three passivating gas air inlets in process of production by 0.1%～1% of reducing gases flow.The flow of three air inlets once increases from front to back.
D. passivation segment trailer has the diffusion mouth with valve, and regulating dispersing gas flow is 1/5～1/3 of reducing gases flow.
E. passivation segment trailer connects self-emptying box, inclination angle 60 degree.
the invention has the beneficial effects as follows:
(1) the present invention compared with prior art have investment little, cost is low, applicability is wide, production process is simple, be suitable for the advantages such as production in enormous quantities.
(2) the present invention adopts the method for direct passivation refining metallic powder on hydrogen reduction production line, has both simplified technique, has saved again paralysis facility investment.
(3) the present invention uses in reduction furnace the reducing gas (hydrogen or decomposed ammonia) of itself to add micro amount of oxygen to carry out passivation refining metallic powder, both handled easilies, and the consumption of having saved again a large amount of inert gases, has reduced passivation cost.
(4) the present invention provides new way for the expansion of reduction furnace performance.
Accompanying drawing explanation
Fig. 1 is refining metallic powder reduction-passivation technology flow chart.
Fig. 2 is the tubular reduction furnace schematic diagram that has increased passivation section.In figure, 1 is burner diffusion mouth; 2 is reduction section; 3 is reducing gases entrance; 4 is cooling section; 5 is passivating gas entrance I; 6 is passivating gas entrance II; 7 is passivating gas entrance III; 8 is passivation section; 9 is passivation section diffusion mouth; 10 is self-emptying box.
The specific embodiment
The enforcement of the inventive method is continued access passivation section after common tubular type hydrogen reduction furnace cooling section.In production process, when the cooled refining metallic powder of reduction enters after passivation section, the air or oxygen passivation constantly being passed in furnace reduction atmosphere, until powder is come out of the stove from self-emptying box with material boat.
embodiment 1
The online passivation of reduction of superfine iron powder
1.2 μ m brown iron oxides are at 460 ℃ of reduction 120min, decomposed ammonia flow 2.5m3/h, passivating gas (air) flow: entrance I 2.5L/h, entrance II 8L/h, entrance III 24L/h, passivation time 60min.
embodiment 2
The online passivation of reduction of fine FeNi powders
10 μ m iron nickel compound grass hydrochlorates are at 600 ℃ of reduction 150min, decomposed ammonia flow 2.5m3/h, passivating gas (air) flow: entrance I 5L/h, entrance II 10L/h, entrance III 20L/h, passivation time 80min.
The online passivation of reduction of fine cobalt powder
1.8 μ m cobalt oxalates are at 530 ℃ of reduction 100min, decomposed ammonia flow 2.5m3/h, passivating gas (air) flow: entrance I 3L/h, entrance II 12L/h, entrance III 20L/h, passivation time 40min.
Claims (4)
1. a method for direct passivation refining metallic powder on hydrogen reduction production line, is characterized in that: this preparation method's the method comprises the steps:
A. continued access passivation section after common tubular type hydrogen reduction furnace cooling section, passivation section is without heating or cooling device, and length is 1/2 ~ 4/5 of reduction section length;
B. passivation section has three passivating gas air inlets, lays respectively at forefront, 1/4 place and 3/5 place of passivation section;
C. passivating gas is air or oxygen, passes into passivating gas air inlet in process of production by 0.1%～1% of reducing gases flow;
D. passivation segment trailer has the diffusion mouth with valve, and regulating dispersing gas flow is 1/5～1/3 of reducing gases flow;
E. passivation segment trailer connects self-emptying box, inclination angle 60 degree.
2. method according to claim 1, is characterized in that: the passivation of refining metallic powder is carried out on hydrogen reduction production line.
3. method according to claim 1, is characterized in that: passivating gas is that reducing gases adds micro-air or oxygen, and the flow of air or oxygen is 0.1%～1% of reducing gases flow.
4. method according to claim 1, is characterized in that passivation section has the diffusion mouth of three passivating gas air inlets and a capable of regulating flow quantity.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310723091.7A CN103736987A (en) | 2013-12-25 | 2013-12-25 | Method for performing direct passivation on micro-fine metal powder on hydrogen reduction production line |
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| CN201310723091.7A CN103736987A (en) | 2013-12-25 | 2013-12-25 | Method for performing direct passivation on micro-fine metal powder on hydrogen reduction production line |
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| CN103736987A true CN103736987A (en) | 2014-04-23 |
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| CN201310723091.7A Pending CN103736987A (en) | 2013-12-25 | 2013-12-25 | Method for performing direct passivation on micro-fine metal powder on hydrogen reduction production line |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112077333A (en) * | 2020-09-18 | 2020-12-15 | 成都世佳环净科技有限公司 | Method for preparing metal powder and energy-saving push boat type hydrogen reduction furnace for preparing metal powder |
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| CN1579678A (en) * | 2003-08-13 | 2005-02-16 | 河南卡斯通超硬材料有限公司 | Metal Powder and alloy powder surface cobalt-covering method |
| CN1593822A (en) * | 2003-09-10 | 2005-03-16 | 厦门金鹭特种合金有限公司 | Preparation method of high performance nanometer sized and superfine tungsten powder |
| CN1817520A (en) * | 2006-03-17 | 2006-08-16 | 金川集团有限公司 | Antioxidative method for superfine chemical nickel powder |
| CN103028735A (en) * | 2011-09-30 | 2013-04-10 | 深圳市格林美高新技术股份有限公司 | Preparation method of semi-micrometer cobalt powder |
| CN103302309A (en) * | 2013-06-17 | 2013-09-18 | 南昌大学 | Preparation method of nano tungsten carbide |
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2013
- 2013-12-25 CN CN201310723091.7A patent/CN103736987A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1579678A (en) * | 2003-08-13 | 2005-02-16 | 河南卡斯通超硬材料有限公司 | Metal Powder and alloy powder surface cobalt-covering method |
| CN1593822A (en) * | 2003-09-10 | 2005-03-16 | 厦门金鹭特种合金有限公司 | Preparation method of high performance nanometer sized and superfine tungsten powder |
| CN1817520A (en) * | 2006-03-17 | 2006-08-16 | 金川集团有限公司 | Antioxidative method for superfine chemical nickel powder |
| CN103028735A (en) * | 2011-09-30 | 2013-04-10 | 深圳市格林美高新技术股份有限公司 | Preparation method of semi-micrometer cobalt powder |
| CN103302309A (en) * | 2013-06-17 | 2013-09-18 | 南昌大学 | Preparation method of nano tungsten carbide |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112077333A (en) * | 2020-09-18 | 2020-12-15 | 成都世佳环净科技有限公司 | Method for preparing metal powder and energy-saving push boat type hydrogen reduction furnace for preparing metal powder |
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Application publication date: 20140423 |
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