CN102699339A - Device for preparing superfine iron powder by utilizing iron oxide red - Google Patents
Device for preparing superfine iron powder by utilizing iron oxide red Download PDFInfo
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- CN102699339A CN102699339A CN2012102186006A CN201210218600A CN102699339A CN 102699339 A CN102699339 A CN 102699339A CN 2012102186006 A CN2012102186006 A CN 2012102186006A CN 201210218600 A CN201210218600 A CN 201210218600A CN 102699339 A CN102699339 A CN 102699339A
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Abstract
The invention relates to a device for preparing superfine iron powder by utilizing iron oxide red. The device mainly comprises a feeding bin, a screw feeder, a fluidized bed, a stirring motor, a stirring paddle, an electric furnace, a cyclone separator, a finished product bin and a woven bag, wherein the lower end of the feeding bin is connected with a feeding inlet of the screw feeder; the upper part of the fluidized bed, the feeding inlet and an outlet of the screw feeder are communicated, and the outlet of the screw feeder is communicated with the inlet of the cyclone separator; the woven bag is arranged at the tail gas outlet at the upper end of the cyclone separator, and the finished product bin is connected at the powder outlet at the lower end of the cyclone separator; the bottom of the fluidized bed is communicated with an air-supply device through an air inlet; the fluidized bed is made of stainless steel tubes welded together, the top end of the fluidized bed body is connected with flanges and is sealed with a heat-resisting rubber mat, and a gas distribution plate is welded at the middle part of the fluidized bed body; the stirring motor is installed at the top of the fluidized bed, the stirring paddle is connected with a rotational axle of the stirring motor, a connecting rod of the stirring paddle stretches into the fluidized bed passing through a center hole at the top end, and the bottom end of the stirring paddle is close to the gas distribution plate; and the fluidized bed is installed at the midpoint of the cavity of the electric furnace. The device disclosed by the invention is low in production cost, and can be used in continuous and mass production.
Description
Technical field
The present invention relates to a kind of device that utilizes iron oxide red to prepare superfine iron powder, belong to superfine powder manufacturing technology field.
Background technology
Superfine iron powder typically refers to the iron powder of grain diameter less than 10 μ m, compares with common iron powder, has very large specific area, and high reactivity, and performances such as unique light, electricity, magnetic are a kind of function powder materials of high added value.In recent years; Superfine iron powder has been widely used in making high performance powdered metal parts, progressively is applied to fields such as magnetic material, catalyst, property of medicine welding wire along with superfine iron powder, and the market demand of superfine iron powder constantly enlarges; Price exceeds 3 ~ 5 times of common iron powder, has good economic benefit.Therefore, many researchers are devoted to the research of superfine iron powder manufacturing approach.
Research institute is retrieved document resource both domestic and external through the metallurgical industry information standard, and the superfine iron powder preparation method who finds comprises high-energy ball milling method, vacuum vapor deposition method, sputtering method, carbonyl process etc.Japan laser physics research institute is with FeCO
5Be raw material; Adopt the method for pulsed infrared line laser pyrolytic to prepare technology and the preparation method that particle diameter is 1～100 nm nano level superfine iron powder; The superfine iron powder particle size of this method preparation is little; Excellent performance, but cost of material is high and need the pulsed infrared line laser, is difficult to realize producing in batches.Shenyang University of Technology adopts the DC arc plasma method to prepare superfine iron powder continuously, though improved productive rate, apparatus expensive causes cost high.The preparation method of a kind of micron order iron powder of Shanghai University's exploitation is with Fe
2O
3Powder finally obtains the iron powder that granularity is 0.28～3 μ m through grinding, dry, heat, reducing, and operation need be with common Fe before this method
2O
3Powder carries out ball milling to be handled with oven dry, causes technological process to increase, and can only discontinuous production, thereby output is limited.
In sum; Existing superfine iron powder preparation method; Owing to cost of material height, complex equipments, severe reaction conditions or many reasons such as can not produce continuously, be difficult to realize large-scale industrial production, also do not develop the method that a kind of low cost prepares superfine iron powder at present.
Summary of the invention
The technical problem that the present invention will solve is: have cost of material height, complex equipments, severe reaction conditions or problem such as can not produce continuously to existing superfine iron powder preparation method; The present invention provides a kind of device of low cost preparation superfine iron powder, realizes low-cost, continuous, batch process superfine iron powder.
For solving the problems of the technologies described above, the technical scheme that the present invention takes is:
A kind of device that utilizes iron oxide red to prepare superfine iron powder is characterized in that: mainly comprise adding feed bin, screw feeder, fluid bed, stirring motor, paddle, electric furnace, cyclone separator, finished bin and cloth bag; Add the feed bin lower end and connect the screw feeder inlet; Both sides, fluid bed top have feeding mouth and discharging opening respectively, and feeding mouth is communicated with the screw feeder outlet, and discharging opening is connected with cyclone inlet; Tail gas exit, cyclone separator upper end is provided with cloth bag, and powder outlet in lower end inserts finished bin; The fluid bed bottom is communicated with feeder through air inlet; Fluid bed is made by the stainless steel tube welding and is formed, and bed body top connects with flange, and with heat-resisting rubber cushion sealing, bed body middle part is welded with gas distribution grid; Stirring motor is installed in the fluid bed top, connects paddle on the machine shaft, and the centre bore that the connecting rod of paddle passes the top stretches in the bed, and the paddle bottom is near distribution grid; Fluid bed is installed in the burner hearth centre of electric furnace; Said iron oxide red is that steel plant reclaim the iron oxide red of purifying, Fe
2O
3Content greater than 99%, particle size range is 1000 orders～5000 orders.
By technique scheme, also be provided with the control system that feeding quantity, gas flow rate, speed of agitator, heating-up temperature and heat time heating time are regulated.
By technique scheme, feeder mainly comprises gas cylinder, gas flowmeter and air delivering pipeline.
By technique scheme, said gas distribution grid is the metal sintering net.
By technique scheme; The workflow of said device is: the iron oxide red raw material through add feed bin, screw feeder flows to fluid bed from fluid bed top; Feeder feeds reducing gases and protection gas from the fluid bed bottom, make the raw material fluidisation behind the gas distribution grid of gas in fluid bed; Rotate the fluidized state of improving raw material through the blade in the fluid bed simultaneously, strengthen the gas-solid contact, improve reaction efficiency; Heater makes the interior temperature of fluid bed reach reduction temperature, afterwards, and beginning reduction reaction in the fluid bed, Fe
2O
3Be reduced into Fe; After reduction is accomplished; Close reducing gas, increase the flow velocity of protection gas, after gas speed surpasses terminal velocity; Iron powder gets into cyclone separator after being blown fluid bed; Gas separates with solid in cyclone separator, and iron powder is transported to storage device cooling and stores from the cyclone separator lower end, tail gas from the upper end exhaust outlet behind bag-type dust, discharge.
The present invention compared with prior art has the following advantages:
(1) the present invention has designed and has made the fluidized reduction device that a cover band stirs, and package unit is simple in structure, is easy to control, and in fluid bed, adds stirring, through stirring the fluidization that promotes feed particles, has strengthened the gas-solid contact, has improved reaction efficiency; Simultaneously, the assurance raw material is kept fluidized state under reduction temperature, and reaction efficiency is high, and the reaction time is short, and production cost is low.Blow out iron powder through screw feeder auto feed, high-speed gas simultaneously and separate iron powder, realized the continuous preparation of superfine iron powder with cyclone separator.The present invention has really realized low cost, continuous, batch process superfine iron powder, after amplifying through equipment, utilizes this method can realize the large-scale industrial production of superfine iron powder.
(2) utilize this device, adopt steel plant to reclaim the iron oxide red of purifying and make raw material, sufficient raw, and this feed particles grain size is micron order, grain diameter is little, thereby has saved ball-milling technology in the conventional method, has effectively reduced cost of material.
(3) final products of the present invention's preparation are superfine iron powder; Its reduction degree reaches more than 95%, and is as shown in Figure 3, and its microscopic appearance particle size is more even; Average grain diameter is about 0.5 μ m, satisfies the performance requirement of the big industry of superfine iron powder demand (as the metallurgical part that makes powder) to iron powder.
Description of drawings
Fig. 1 is apparatus of the present invention structural representations; Among the figure, 1. add feed bin; 2. screw feeder; 3. fluid bed; 4. stirring motor; 5. paddle; 6. electric furnace; 7. cyclone separator; 8. finished bin; 9. cloth bag.
Fig. 2 adopts device of the present invention to prepare the process chart of superfine iron powder.
Fig. 3 is the stereoscan photograph that adopts the superfine iron powder of device preparation of the present invention.
The specific embodiment
Device of the present invention is as shown in Figure 1; Form by adding feed bin 1, screw feeder 2, fluid bed 3, motor 4, paddle 5, electric furnace 6, cyclone separator 7, finished bin 8 and cloth bag 9, concrete structure is explained as follows: add feed bin 1 lower end and connect screw feeder 2 inlets; Both sides, fluid bed 3 top have feeding mouth and discharging opening respectively, and feeding mouth is communicated with screw feeder 2 outlets, and discharging opening is connected with cyclone separator 7 inlets; Cloth bag 9 dedustings are used in tail gas exit, cyclone separator 7 upper end, and powder outlet in lower end inserts finished bin; Fluid bed 3 is made by the stainless steel tube welding and is formed, and bed body top connects with flange, and with heat-resisting rubber cushion sealing, bed body middle part is welded with gas distribution grid, and distribution grid adopts the metal sintering net, plays the effect of distribution air-flow; Stirring motor 4 is installed in fluid bed 3 tops, connects paddle 5 in motor 4 rotating shafts, and the centre bore that the connecting rod of paddle 5 passes the top stretches in the bed, and paddle 5 bottoms are near distribution grid; Fluid bed 3 is installed in the burner hearth centre of electric furnace 6, can guarantee the even of an interior temperature during electric furnace 6 heating.
It is as shown in Figure 2 to adopt device of the present invention to prepare the technological process of superfine iron powder; Detailed process is explained as follows: feeding device (comprise and add feed bin and screw feeder) flows to fluid bed with raw material; Feeder (comprising gas cylinder, gas flowmeter and air delivering pipeline) feeds reducing gases and protection gas from the fluid bed bottom; Industrial gas is made reducing gases, and nitrogen is made protection gas, and gas makes the raw material fluidisation behind distribution grid; Agitating device (comprising motor, paddle and speed regulator) rotates the fluidized state of improving raw material through blade simultaneously, strengthens the gas-solid contact, improves reaction efficiency; Heater (comprising electric furnace, thermocouple and temperature controller) makes the interior temperature of fluid bed reach reduction temperature, beginning reduction reaction in the fluid bed, Fe
2O
3By H
2Be reduced into Fe with CO; After reduction is accomplished; Close reducing gas, increase the flow velocity of protective gas, after gas speed surpasses terminal velocity; Iron powder is blown fluid bed and gets into separator (comprising cyclone separator and dust-removal cloth-bag); Gas separates with solid in cyclone separator, and iron powder is transported to storage device (comprising finished bin, seal cover and cooling water pipe) cooling and stores from the cyclone separator lower end, tail gas from the upper end exhaust outlet behind bag-type dust, discharge.Control system (comprising industrial computer, sensor and control software) can regulate feeding quantity, gas flow rate, speed of agitator, heating-up temperature and heat time heating time, guaranteed that the reduction process continous-stable carries out in the fluid bed.
The specific embodiment of two preparation superfine iron powders below is provided.
Embodiment 1: at first in adding feed bin 1, add a certain amount of raw material; Open gas cylinder and in fluid bed 3, feed protective gas (nitrogen), drain the air in the fluid bed 3; Open electric furnace 6 heated fluidized beds to design temperature; Start screw feeder 2 to fluid bed 3 transferring raw materials, and start stirring motor 4, regulate rotating speed to setting value; The while switching gas circuit; Feed reacting gas (industrial gas and nitrogen), regulate gas speed and gas volume ratio (industrial gas/nitrogen) to setting value, the beginning reduction reaction; React to setting-up time, stop to stir, switching gas circuit to protective gas (nitrogen) also increases gas speed, and product is blown out from fluid bed 3, and final iron powder gets into finished bin 8 cooling preservation through cyclone separator 7, and tail gas is discharged after cloth bag 9 dedustings.Among the embodiment 1, parameters is set as follows: the gas volume ratio is 0.5, and speed of agitator is 300 r/min, and gas speed was 5 m/s during reaction was carried out, and the speed that puffs away after the reaction is 20 m/s, and reduction temperature is 500 ℃, and the reaction time is 15 min.After reaction finished, sampling detects and obtains the final products reduction degree was 98%, and the particle average grain diameter is about 0.54 μ m.
Embodiment 2:
Experimental provision and preparation process are with embodiment 1.Parameters is set as follows: the gas volume ratio is 0.3, and speed of agitator is 500 r/min, and gas speed was 2 m/s during reaction was carried out, and the speed that puffs away after the reaction is 20 m/s, and reduction temperature is 400 ℃, and the reaction time is 30 min.After reaction finished, sampling detects and obtains the final products reduction degree was 96%, and the particle average grain diameter is about 0.48 μ m.
The final products of device preparation of the present invention are superfine iron powder; Its reduction degree reaches more than 95%, and is as shown in Figure 3, and its microscopic appearance particle size is more even; Average grain diameter is about 0.5 μ m, satisfies the performance requirement of the big industry of superfine iron powder demand (as the metallurgical part that makes powder) to iron powder.
Above disclosedly be merely preferred embodiment of the present invention, can not limit the present invention's interest field certainly with this, the equivalence of therefore doing according to claim of the present invention changes, and still belongs to protection scope of the present invention.
Claims (7)
1. a device that utilizes iron oxide red to prepare superfine iron powder is characterized in that: mainly comprise adding feed bin, screw feeder, fluid bed, stirring motor, paddle, electric furnace, cyclone separator, finished bin and cloth bag; Add the feed bin lower end and connect the screw feeder inlet; Both sides, fluid bed top have feeding mouth and discharging opening respectively, and feeding mouth is communicated with the screw feeder outlet, and discharging opening is connected with cyclone inlet; Tail gas exit, cyclone separator upper end is provided with cloth bag, and powder outlet in lower end inserts finished bin; The fluid bed bottom is communicated with feeder through air inlet; Fluid bed is made by the stainless steel tube welding and is formed, and bed body top connects with flange, and with heat-resisting rubber cushion sealing, bed body middle part is welded with gas distribution grid; Stirring motor is installed in the fluid bed top, connects paddle on the machine shaft, and the centre bore that the connecting rod of paddle passes the top stretches in the bed, and the paddle bottom is near distribution grid; Fluid bed is installed in the burner hearth centre of electric furnace; Said iron oxide red is that steel plant reclaim the iron oxide red of purifying, Fe
2O
3Content greater than 99%, particle size range is 1000 orders～5000 orders.
2. device according to claim 1 is characterized in that: also be provided with the control system that feeding quantity, gas flow rate, speed of agitator, heating-up temperature and heat time heating time are regulated.
3. device according to claim 1 and 2 is characterized in that: feeder mainly comprises gas cylinder, gas flowmeter and air delivering pipeline.
4. device according to claim 1 and 2 is characterized in that: said gas distribution grid is the metal sintering net.
5. device according to claim 3 is characterized in that: said gas distribution grid is the metal sintering net.
6. according to claim 1 or 2 or 5 described devices; It is characterized in that: the workflow of said device is: the iron oxide red raw material through add feed bin, screw feeder flows to fluid bed from fluid bed top; Feeder feeds reducing gases and protection gas from the fluid bed bottom, make the raw material fluidisation behind the gas distribution grid of gas in fluid bed; Rotate the fluidized state of improving raw material through the blade in the fluid bed simultaneously, strengthen the gas-solid contact, improve reaction efficiency; Heater makes the interior temperature of fluid bed reach reduction temperature, afterwards, and beginning reduction reaction in the fluid bed, Fe
2O
3Be reduced into Fe; After reduction is accomplished; Close reducing gas, increase the flow velocity of protection gas, after gas speed surpasses terminal velocity; Iron powder gets into cyclone separator after being blown fluid bed; Gas separates with solid in cyclone separator, and iron powder is transported to storage device cooling and stores from the cyclone separator lower end, tail gas from the upper end exhaust outlet behind bag-type dust, discharge.
7. device according to claim 4; It is characterized in that: the workflow of said device is: the iron oxide red raw material through add feed bin, screw feeder flows to fluid bed from fluid bed top; Feeder feeds reducing gases and protection gas from the fluid bed bottom, make the raw material fluidisation behind the gas distribution grid of gas in fluid bed; Rotate the fluidized state of improving raw material through the blade in the fluid bed simultaneously, strengthen the gas-solid contact, improve reaction efficiency; Heater makes the interior temperature of fluid bed reach reduction temperature, afterwards, and beginning reduction reaction in the fluid bed, Fe
2O
3Be reduced into Fe; After reduction is accomplished; Close reducing gas, increase the flow velocity of protection gas, after gas speed surpasses terminal velocity; Iron powder gets into cyclone separator after being blown fluid bed; Gas separates with solid in cyclone separator, and iron powder is transported to storage device cooling and stores from the cyclone separator lower end, tail gas from the upper end exhaust outlet behind bag-type dust, discharge.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012102186006A CN102699339A (en) | 2012-06-29 | 2012-06-29 | Device for preparing superfine iron powder by utilizing iron oxide red |
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| CN2012102186006A CN102699339A (en) | 2012-06-29 | 2012-06-29 | Device for preparing superfine iron powder by utilizing iron oxide red |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103203457A (en) * | 2013-04-15 | 2013-07-17 | 河北钢铁股份有限公司邯郸分公司 | Method for manufacturing iron-copper alloy from iron oxide red and copper sulfate |
| CN104439265A (en) * | 2014-11-03 | 2015-03-25 | 武汉钢铁(集团)公司 | Method and device for producing micron-sized superfine iron powder through regenerative iron red |
| CN104801721A (en) * | 2015-05-15 | 2015-07-29 | 中国科学院过程工程研究所 | Equipment and method for preparing nanometer metal powder |
| CN107670811A (en) * | 2017-10-26 | 2018-02-09 | 河北工业职业技术学院 | Particle Logistics milling apparatus |
| CN107745132A (en) * | 2017-10-20 | 2018-03-02 | 酒泉钢铁(集团)有限责任公司 | A kind of method that iron oxide red prepares high-purity iron powder |
| CN112354504A (en) * | 2020-11-07 | 2021-02-12 | 湖南德之聚新材料有限公司 | Wet preparation device of iron oxide yellow pigment |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103203457A (en) * | 2013-04-15 | 2013-07-17 | 河北钢铁股份有限公司邯郸分公司 | Method for manufacturing iron-copper alloy from iron oxide red and copper sulfate |
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| CN104801721A (en) * | 2015-05-15 | 2015-07-29 | 中国科学院过程工程研究所 | Equipment and method for preparing nanometer metal powder |
| CN107745132A (en) * | 2017-10-20 | 2018-03-02 | 酒泉钢铁(集团)有限责任公司 | A kind of method that iron oxide red prepares high-purity iron powder |
| CN107670811A (en) * | 2017-10-26 | 2018-02-09 | 河北工业职业技术学院 | Particle Logistics milling apparatus |
| CN107670811B (en) * | 2017-10-26 | 2024-02-06 | 河北工业职业技术学院 | Particle logistics grinding equipment |
| CN112354504A (en) * | 2020-11-07 | 2021-02-12 | 湖南德之聚新材料有限公司 | Wet preparation device of iron oxide yellow pigment |
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Application publication date: 20121003 |