CN102634654A - Method for producing metallized pellets by using composite carbon-containing pellets and chain belt type roasting machine - Google Patents

Method for producing metallized pellets by using composite carbon-containing pellets and chain belt type roasting machine Download PDF

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Publication number
CN102634654A
CN102634654A CN2012101206695A CN201210120669A CN102634654A CN 102634654 A CN102634654 A CN 102634654A CN 2012101206695 A CN2012101206695 A CN 2012101206695A CN 201210120669 A CN201210120669 A CN 201210120669A CN 102634654 A CN102634654 A CN 102634654A
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chain
machine
composite carbon
carbon containing
pellet
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朱勇
陈小林
肖伦
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陈小林
肖伦
朱勇
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Abstract

The invention discloses a method for producing metallized pellets by using composite carbon-containing pellets. The method comprises the following steps of: preparing carbon-containing pellets by using a raw material mixed with quantitative carbon and iron; preparing cladding powder containing carbon and volatile matters; preparing the composite carbon-containing pellets; and drying the composite carbon-containing pellets, performing high-temperature reductive roasting in a chain belt type roasting machine, quenching with water, de-cladding, and performing magnetic separation and grading treatment, thus obtaining the metallized pellets. The invention also discloses the chain belt type roasting machine. Two ends of a furnace body of the roasting machine are respectively provided with a feeding hole and a discharge hole; the upper part of the furnace body is provided with a chimney; a chain belt and a blowing chamber of a chain belt machine are positioned in the lower space in the furnace body; a distributor and a discharger are respectively arranged at the feeding hole and discharge hole of the furnace body; and a nozzle is arranged at the inner face of the upper wall of the furnace body. The metal intermediate slag mixed with the carbon and the iron is processed into an iron-making high-quality raw material, namely the metallized pellets, so waste is changed into valuables; and the method is low in processing energy consumption and efficient, and can be implemented in a large scale.

Description

Utilize composite carbon containing pellet to produce the method and the chain-belt type burning machine of metallized pellet
Technical field
The present invention relates to a kind of method and calciner of producing metallized pellet, relate in particular to a kind of method and chain-belt type burning machine that utilizes composite carbon containing pellet to produce metallized pellet.
Background technology
Day by day the shortage of coking coal charcoal resource is a bottleneck depending on traditional blast furnace process Sustainable development of high-quality caking coal unduly.
With the coal-based direct reduction method is that the prereduction prereduced burden (metallized pellet) that technique means is produced is to reduce this dependent effective measure.Degree of metalization reaches the above person of 80-90% and is called metallic pellet.Degree of metalization reaches 30%-80% and is called the semi metallized pellet ore deposit.
Use the practice of metallized pellet to show according to blast furnaces such as the U.S., Japan: the every raising 10% of the degree of metalization of pellet, can reduce coke ratio 4-6%, output improves 5-7%.Using 100% degree of metalization is 65% metallic pellet, and fuel ratio can drop to the level below the 300kg/t.Simultaneously, blast furnace directly reduces minimizing, and the coal gas distributions is more reasonable, and the coal gas utilization improves, and operation of blast furnace is smooth and easy.
Also will consume energy though produce prereduced burden, what generally use is mill coal, comprises that simultaneously the total energy consumption of blast furnace does not increase.Therefore, blast furnace uses metallized pellet, can effectively reduce CO and CO2 quantity discharged.
The coal-based method production technique of metallized pellet is divided shaft furnace, rotary kiln, rotary hearth furnace and sintering process etc.The shaft furnace process service temperature is low, and product cost is high.The existing sponge iron rotary kiln of China can be transformed and be used to produce low-quality prereduction pellet, and the shortcoming of kiln process is that throughput is low.Year history surplus the exploitation of rotary hearth furnace Study on Technology has had 20, the technology comparative maturity, but be still waiting to improve in productivity and energy consumption index.
Therefore, developing a kind of have concurrently working method and the device economical and metallized pellet that is suitable for, is present urgent problem.Also do not see relevant open source literature or report or application at present.
Summary of the invention
The object of the invention provides a kind of method and chain-belt type burning machine that utilizes composite carbon containing pellet to produce metallized pellet with regard to being in order to address the above problem.
In order to achieve the above object, the present invention has adopted following technical scheme:
The method of utilizing composite carbon containing pellet to produce metallized pellet according to the invention may further comprise the steps:
The raw material that (1) will be mixed with quantitative carbon and iron is processed 120-200 purpose fine powder and is used the dribbling balling machine balling-up to process diameter to be 12-16mm, the COR carbonaceous pelletizing as 0.5-1.0;
(2) with one or more mixing in bituminous coal, brown coal, lime powder, coal slime and the coal gangue, process 160-200 purpose fine powder, obtain the involucrum powder;
(3) with containing involucrum powder in charcoal pelletizing and the said step (2) by 100 in the said step (1): mass ratio (10-50) is put into another dribbling balling machine, adds the balling-up of caking agent continued; When the said involucrum powder thickness of said carbonaceous pelletizing surface coverage reaches 0.5-3.0mm, obtain composite carbon containing pellet;
(4) composite carbon containing pellet in the said step (3) gets in the chain-belt type burning machine and carries out the high temperature reduction roasting after drying, and maturing temperature is 1100-1250 ℃, the bed thickness 100mm-500mm of said composite carbon containing pellet, and roasting time is 25-50 minute;
The composite carbon containing pellet that (5) will pass through after said step (4) is handled carries out Water Quenching, and after shelling, magnetic separation, stage treatment, obtains metallized pellet.
As preferably; In the said step (4); Combustion air gets into the composite carbon containing pellet bed from the zoned air chamber of said chain-belt type burning machine bottom; The size of the zoned air indoor air output of the air quantity of said combustion air through adjusting said chain-belt type burning machine bottom is regulated, and the size of said air output is as the criterion with the speed needs of the vertical reducing roasting of satisfying the composite carbon containing pellet bed; Air supply mode is pulsed air-supply or frequency conversion type air-supply.The air quantity size has determined the temperature of reaction level and the atmospheric condition of composite pellet.Air quantity is too big, and to make composite pellet be directly exposed to strong oxidizing atmosphere too greatly be in the air and oxidation again for composite pellet temperature too high and fusing or involucrum layer coal powder consumption.Air quantity is too little, and the composite pellet temperature is too low, and reaction times prolongation or resultant metal level are low.Both all influence the quality of metallized pellet.CO gas during the pulse air-supply in the composite pellet has one to be arranged in the composite pellet time difference on every side again; Once more after the air-supply; Airborne oxygen at first with composite pellet around the CO combustion reactions; So just protect the coal dust on the composite pellet face, thereby guaranteed atmosphere level and metallization level around the composite pellet.The mode of preferred pulse air-supply of the present invention, the mode that also can adopt frequency conversion to blow realizes the control of air quantity.
In the said step (4), the maturing temperature in the said chain-belt type burning machine was elevated to 1100-1250 ℃ in 5-10 minute, and this is that the direct reduction reactor fierceness is carried out required temperature.First responding layer the superiors responding layer of composite pellet bed is caught fire rapidly, and this can rely on lighter for ignition to realize.If the slow oxidation burning of composite carbon containing pellet surface causes composite pellet reducing roasting temperature can not be raised to the fierce level of carrying out of direct reduction, this will reduce the degree of metalization of roasting product.Under 1300 ℃ level, the metallization level of carbonaceous pelletizing is higher.But sinter piece easily into, so the temperature levels of composite carbon containing pellet roasting in the chain-belt type burning machine is chosen in 1100-1250 ℃.
In the said step (4), the bake out temperature that said composite carbon containing pellet is carried out in the drying treatment process is 150-250 ℃, the water ratio of dried said composite carbon containing pellet≤3%.
In the said step (4), through adjusting the rotating speed of said chain-belt type burning machine transmission mechanism, the time of said chain-belt type burning machine being moved a firing cycle was controlled in 25-50 minute.
The chain-belt type burning machine that utilizes composite carbon containing pellet to produce metallized pellet according to the invention; Comprise body of heater, chain belt machine, material distributing machine, discharging machine and plenum chamber; Said chain belt machine comprises chain belt, chain belt wheel and drive unit; The two ends of said body of heater are respectively arranged with feeding mouth and discharge port, and the top of said body of heater is provided with chimney, and the chain belt of said chain belt machine is positioned at the intravital lower space of said stove; Said material distributing machine is arranged at the opening for feed place of said body of heater; Said discharging machine is arranged at the discharge port place of said body of heater, and furnace wall, the top inner face of said body of heater is provided with burner, and said plenum chamber is arranged at the intravital lower space of said stove and is positioned at the corresponding position, cochain below of said chain belt.
During operation, composite carbon containing pellet gets in the body of heater through the feeding mouth of material distributing machine from body of heater, and branch is placed on the chain belt of chain belt machine formation composite carbon containing pellet bed.Air plenum chamber below chain belt is introduced, with composite carbon containing pellet intersection mutually.Composite carbon containing pellet bed top is being heated by burner; Combustible gas injected or combustion air form flame in the burner as required; Be the heating of composite carbon containing pellet bed top; From top to bottom layering accomplish successively that preheating, fugitive constituent are caught fire, the process of burning, reducing roasting, accomplish reducing roasting process up to whole composite carbon containing pellet bed and obtain metallized pellet, see off through discharging machine afterwards.
Formed bed structure is in the chain-belt type burning machine: the upper strata is the high-temperature product layer after the reduction, and middle is the reducing roasting layer, and the bottom is for treating the roasting responding layer.The flow direction of air is from bottom to top, and the air quantity of each fragment position can be adjusted through the plenum chamber of burning machine bottom in the burning machine.Because the airborne oxygen that supplies only can provide the needs of high temperature reduction roasting, the gas that therefore gets into upper strata high-temperature product layer is with CO 2And H 2O is main weak oxide property products of combustion.Remaining fixed carbon and ash content also provide a kind of protection in the involucrum layer simultaneously.Can stably control the degree of metalization of product through the thickness of adjustment involucrum layer.
With regard to general following current sinter process, the high-temperature roasting layer that forms in the upper surface igniting is difficult to expansion downwards.The present invention can realize expanding under the reducing roasting course through the method for the hydrocarbon volatile content in the control composite carbon containing pellet smoothly, has guaranteed the continuous and stable of reducing roasting process.
Particularly, said burner is a plurality of, is uniformly distributed in furnace wall, the top inner face of said body of heater along the direction of said chain belt; Said plenum chamber is a plurality of, and the direction of the said chain belt in edge is uniformly distributed in the intravital lower space of said stove.The spacing of burner and plenum chamber is decided according to the actual requirements, with layering from top to bottom accomplish smoothly successively that preheating, fugitive constituent are caught fire, burning, reducing roasting process be purpose.
Further, the top of said chimney is connected with gas cooler and sack cleaner in turn.Flue helps environmental protection.
As preferably, said material distributing machine is the shuttle-type material distributing machine, and said discharging machine is a dissepiment formula discharging machine.
Further, the hopper outlet position of said material distributing machine is provided with the bed thickness control gate.Bed thickness through the control composite carbon containing pellet reaches best roasting effect.
Beneficial effect of the present invention is:
1, it is semi metallized pellet that the middle slag of the metal that is mixed with carbon and iron that adopts the present invention directly not use is processed into the ironmaking high quality raw material, turns waste into wealth.
2, the present invention is through selecting the reliable chain-belt type burning machine of performance roasting composite carbon containing pellet for use, thoroughly avoids the influence that causes to production owing to the equipment reason, and the normal operation ratio of equipment can reach more than 98%, makes the mass-producing of metallized pellet production become possibility.
3, can realize the production capacity of 300-500kg/m2.h through the present invention, be 3-5 times of identical roasting area rotary hearth furnace production efficiency, and the single machine yield semi metallized pellet reaches more than 600,000 tons/year, can thoroughly avoid because the influence that molten materials causes to production.
4, adopting its resultant metal rate of the present invention is 60-80%; Controlled in the interval, lower slightly than traditional rotary hearth furnace, but because rotary hearth furnace adopts the high energy or the secondary energy such as Sweet natural gas or gas maked coal; Wasted the energy; The present invention has then adopted directly the burn technology of heating pelletizing of involucrum coal dust in the composite carbon containing pellet, and therefore, energy consumption of unit product is compared rotary hearth furnace process and reduced 1/3-1/2.
5, can economically viable metallized pellet be provided for big blast furnace production.Method of the present invention is suitable for the present higher iron ore deposit utilization of iron content, lead, zinc that still can't effectively utilize.
6, the present invention both can combine the magnetic division technique, and producing all iron content is the smart powder of iron of 60-90%, also can combine molten division technique, realizes slitless connection with traditional blast furnace or melting furnace technology, for it provides high-quality metallized pellet.
To sum up, the present invention is the another significant technology and the calciner that can become the middle slag comprehensive utilization of resources of metal after traditional rotary hearth furnace process, has great importance.
Description of drawings
Fig. 1 is the structural representation of chain-belt type burning machine according to the invention;
Fig. 2 is a composite carbon containing pellet following current reducing roasting principle schematic according to the invention.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is made further specific descriptions:
As shown in Figure 1; Chain-belt type burning machine according to the invention comprises body of heater 1, chain belt machine, shuttle-type material distributing machine 13, dissepiment formula discharging machine 9 and plenum chamber 10; Said chain belt machine comprises chain belt 11, chain belt wheel 8 and drive unit 12, and chain belt 11 adopts carrier bar 6 to be formed by connecting through bearing pin 7, the drive unit 12 general variable-frequency motors that adopt; Its outputting power driving chain belt wheel 8 or chain belt 11 make chain belt 11 around 8 rotations of chain belt wheel; The two ends of body of heater 1 are respectively arranged with feeding mouth and discharge port (unmarked among the figure), and the top of body of heater 1 is provided with chimney 3, and the top of chimney 3 is connected with gas cooler 4 and sack cleaner 5 in turn, but flue helps environmental protection; Chain belt 11 is positioned at the lower space of body of heater 1; Shuttle-type material distributing machine 13 is arranged at the opening for feed place of body of heater 1; Dissepiment formula discharging machine 9 is arranged at the discharge port place of body of heater 1; Furnace wall, the top inner face of body of heater 1 is provided with burner 2, and plenum chamber 10 is arranged at the lower space in the body of heater 1 and is positioned at the corresponding position, cochain below of chain belt 11; Burner 2 and plenum chamber 10 are a plurality of, and the direction along chain belt is uniformly distributed in furnace wall, the top inner face of body of heater 1 and the lower space in the body of heater 1 respectively.
As shown in Figure 2, the outlet position of hopper 14 belows of shuttle-type material distributing machine 13 is provided with bed thickness control gate 16, and the bed thickness through the control composite carbon containing pellet reaches best roasting effect.
In conjunction with Fig. 1 and Fig. 2, the method for utilizing composite carbon containing pellet to produce metallized pellet may further comprise the steps:
The raw material that (1) will be mixed with quantitative carbon and iron is processed 120-200 purpose fine powder and is used the dribbling balling machine balling-up to process diameter to be 12-16mm, the COR carbonaceous pelletizing as 0.5-1.0;
(2) with one or more mixing in bituminous coal, brown coal, lime powder, coal slime and the coal gangue, process 160-200 purpose fine powder, obtain the involucrum powder;
(3) with containing involucrum powder in charcoal pelletizing and the said step (2) by 100 in the said step (1): mass ratio (10-50) is put into another dribbling balling machine, adds the balling-up of caking agent continued; When the said involucrum powder thickness of said carbonaceous pelletizing surface coverage reaches 0.5-3.0mm, obtain composite carbon containing pellet;
(4) composite carbon containing pellet in the said step (3) is through after 150-250 ℃ the bake out temperature drying; Its water ratio≤3%; Get into then and carry out the high temperature reduction roasting in the chain-belt type burning machine; Maturing temperature is 1100-1250 ℃, the bed thickness 100mm-500mm of said composite carbon containing pellet, and roasting time is 25-50 minute;
The composite carbon containing pellet that (5) will pass through after said step (4) is handled carries out Water Quenching, and after shelling, magnetic separation, stage treatment, obtains metallized pellet.
As depicted in figs. 1 and 2: in the above-mentioned steps (4); Composite carbon containing pellet forms pelletizing virgin material district 15 in the hopper 14 of shuttle-type material distributing machine 13; Also divide in the outlet entering body of heater 1 of the composite carbon containing pellet in pelletizing virgin material district 15 through hopper 14 belows and be placed on the chain belt 11 of chain belt machine; Form the composite carbon containing pellet bed, the thickness of composite carbon containing pellet bed is through 16 controls of bed thickness control gate.The plenum chamber 10 of combustion air below chain belt 11 introduced; With composite carbon containing pellet intersection mutually; The air quantity of combustion air is regulated through the size of air outputs in the plenum chamber 10 of adjustment chain-belt type burning machine bottom, and the size of air output is as the criterion with the speed needs of the vertical reducing roasting of satisfying the composite carbon containing pellet bed; Air supply mode is the pulsed air-supply, also can select the frequency conversion type air-supply.Composite carbon containing pellet bed top is being heated by burner 2; Combustible gas injected in the burner 2; The igniting back forms flame; Be the heating of composite carbon containing pellet bed top, the maturing temperature in the chain-belt type burning machine was elevated to 1100-1250 ℃ in 5-10 minute, and this is that the direct reduction reactor fierceness is carried out required temperature.The composite carbon containing pellet bed from top to bottom layering accomplish successively that preheating, fugitive constituent are caught fire, the process of burning, reducing roasting, accomplish reducing roasting process up to whole composite carbon containing pellet bed.In the said process, through the rotating speed of adjustment chain-belt type burning machine transmission mechanism, the time of the chain-belt type burning machine being moved a firing cycle was controlled in 25-50 minute.
As shown in Figure 2; In the said process; Composite carbon containing pellet through separating out volatilization district 17, high temperature reduction roast area 18 and high-temperature product district, reduction back 19, is seen off through the dissepiment formula discharging machine 9 among Fig. 1 successively afterwards, carries out Water Quenching at last; And after shelling, magnetic separation, stage treatment, obtain metallized pellet.

Claims (10)

1. method of utilizing composite carbon containing pellet to produce metallized pellet is characterized in that: may further comprise the steps:
The raw material that (1) will be mixed with quantitative carbon and iron is processed 120-200 purpose fine powder and is used the dribbling balling machine balling-up to process diameter to be 12-16mm, the COR carbonaceous pelletizing as 0.5-1.0;
(2) with one or more mixing in bituminous coal, brown coal, lime powder, coal slime and the coal gangue, process 160-200 purpose fine powder, obtain the involucrum powder;
(3) with containing involucrum powder in charcoal pelletizing and the said step (2) by 100 in the said step (1): mass ratio (10-50) is put into another dribbling balling machine, adds the balling-up of caking agent continued; When the said involucrum powder thickness of said carbonaceous pelletizing surface coverage reaches 0.5-3.0mm, obtain composite carbon containing pellet;
(4) composite carbon containing pellet in the said step (3) gets in the chain-belt type burning machine and carries out the high temperature reduction roasting after drying, and maturing temperature is 1100-1250 ℃, the bed thickness 100mm-500mm of said composite carbon containing pellet, and roasting time is 25-50 minute;
The composite carbon containing pellet that (5) will pass through after said step (4) is handled carries out Water Quenching, and after shelling, magnetic separation, stage treatment, obtains metallized pellet.
2. the method for utilizing composite carbon containing pellet to produce metallized pellet according to claim 1; It is characterized in that: in the said step (4); Combustion air gets into the composite carbon containing pellet bed from the zoned air chamber of said chain-belt type burning machine bottom; The size of the zoned air indoor air output of the air quantity of said combustion air through adjusting said chain-belt type burning machine bottom is regulated, and the size of said air output is as the criterion with the speed needs of the vertical reducing roasting of satisfying the composite carbon containing pellet bed; Air supply mode is pulsed air-supply or frequency conversion type air-supply.
3. the method for utilizing composite carbon containing pellet to produce metallized pellet according to claim 1 is characterized in that: in the said step (4), the maturing temperature in the said chain-belt type burning machine was elevated to 1100-1250 ℃ in 5-10 minute.
4. the method for utilizing composite carbon containing pellet to produce metallized pellet according to claim 1; It is characterized in that: in the said step (4); The bake out temperature that said composite carbon containing pellet is carried out in the drying treatment process is 150-250 ℃, the water ratio of dried said composite carbon containing pellet≤3%.
5. the method for utilizing composite carbon containing pellet to produce metallized pellet according to claim 1; It is characterized in that: in the said step (4); Through adjusting the rotating speed of said chain-belt type burning machine transmission mechanism, the time of said chain-belt type burning machine being moved a firing cycle was controlled in 25-50 minute.
6. chain-belt type burning machine that utilizes composite carbon containing pellet to produce metallized pellet as claimed in claim 1; It is characterized in that: comprise body of heater, chain belt machine, material distributing machine, discharging machine and plenum chamber; Said chain belt machine comprises chain belt, chain belt wheel and drive unit; The two ends of said body of heater are respectively arranged with feeding mouth and discharge port, and the top of said body of heater is provided with chimney, and the chain belt of said chain belt machine is positioned at the intravital lower space of said stove; Said material distributing machine is arranged at the opening for feed place of said body of heater; Said discharging machine is arranged at the discharge port place of said body of heater, and furnace wall, the top inner face of said body of heater is provided with burner, and said plenum chamber is arranged at the intravital lower space of said stove and is positioned at the corresponding position, cochain below of said chain belt.
7. chain-belt type burning machine according to claim 6 is characterized in that: said burner is a plurality of, is uniformly distributed in furnace wall, the top inner face of said body of heater along the direction of said chain belt; Said plenum chamber is a plurality of, and the direction of the said chain belt in edge is uniformly distributed in the intravital lower space of said stove.
8. chain-belt type burning machine according to claim 6 is characterized in that: the top of said chimney is connected with gas cooler and sack cleaner in turn.
9. chain-belt type burning machine according to claim 6 is characterized in that: said material distributing machine is the shuttle-type material distributing machine, and said discharging machine is a dissepiment formula discharging machine.
10. according to claim 6 or 9 described chain-belt type burning machines, it is characterized in that: the hopper outlet position of said material distributing machine is provided with the bed thickness control gate.
CN2012101206695A 2012-04-16 2012-04-16 Method for producing metallized pellets by using composite carbon-containing pellets and chain belt type roasting machine Pending CN102634654A (en)

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CN103266222A (en) * 2013-05-31 2013-08-28 冀州市华昌机械厂 Chain-row type equipment for roasting iron oxide pellets
CN103409614A (en) * 2013-07-04 2013-11-27 南召县英利矿山机械有限公司 Bidirectional reducing labyrinth type roasting machine
CN103805771A (en) * 2014-02-25 2014-05-21 郭世宏 Method for producing iron from sulfuric acid residue
CN106916942A (en) * 2017-04-19 2017-07-04 王冰 A kind of processing method of smelting iron and steel slag making
CN106957956A (en) * 2017-05-19 2017-07-18 王冰 A kind of steel and iron industry residue contamination thing integrated conduct method
CN108713062A (en) * 2016-02-19 2018-10-26 奥图泰(芬兰)公司 The method and apparatus for loading the tray carriage of the mobile grate for loose unpacked material heat treatment
CN110484713A (en) * 2019-09-05 2019-11-22 首钢集团有限公司 A kind of method and device producing pellet

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CN103805771A (en) * 2014-02-25 2014-05-21 郭世宏 Method for producing iron from sulfuric acid residue
CN108713062A (en) * 2016-02-19 2018-10-26 奥图泰(芬兰)公司 The method and apparatus for loading the tray carriage of the mobile grate for loose unpacked material heat treatment
CN108713062B (en) * 2016-02-19 2020-03-17 奥图泰(芬兰)公司 Method and apparatus for loading a pallet truck with a travelling grate for the thermal treatment of bulk material
CN106916942A (en) * 2017-04-19 2017-07-04 王冰 A kind of processing method of smelting iron and steel slag making
CN106957956A (en) * 2017-05-19 2017-07-18 王冰 A kind of steel and iron industry residue contamination thing integrated conduct method
CN110484713A (en) * 2019-09-05 2019-11-22 首钢集团有限公司 A kind of method and device producing pellet
CN110484713B (en) * 2019-09-05 2021-02-19 首钢集团有限公司 Method and device for producing pellet ore

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Application publication date: 20120815