CN103290161B - Equipment and method for carrying out slag-iron separation and iron reduction on refractory ore, complex ore and chemical industry ferruginous waste - Google Patents

Equipment and method for carrying out slag-iron separation and iron reduction on refractory ore, complex ore and chemical industry ferruginous waste Download PDF

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CN103290161B
CN103290161B CN201310189325.4A CN201310189325A CN103290161B CN 103290161 B CN103290161 B CN 103290161B CN 201310189325 A CN201310189325 A CN 201310189325A CN 103290161 B CN103290161 B CN 103290161B
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rotary kiln
ore
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CN103290161A (en
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陶立群
唐竹胜
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LIAONING BRILLIANT METALLURGY TECHNOLOGY Co Ltd
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Abstract

The invention belongs to the technical field of metallurgy, and particularly relates to equipment and method for carrying out slag-iron separation and iron reduction on refractory ores, complex ores and chemical industry ferruginous wastes. The equipment is provided with secondary combustion chamber between a chain grate and a rotary kiln; the top of the secondary combustion chamber is provided with an air pipeline and connected with the top of the chain grate through the air pipeline; and the bottom of the chain grate is connected with a heat recuperation fan to form a flue gas loop and is provided with a pea coal spray gun and a powdered coal spray gun on the outlet of head of the rotary kiln. The method disclosed by the invention can be used for carrying out the reduction and slag-iron separation in the rotary kiln in a pelletizing way by crushing the refractory ores, the complex ores and the ferruginous wastes. The method disclosed by the invention can be used for directly applying the low-poor refractory ores with the grade of 35%-55%, the complex ores and the ferruginous wastes, directly reducing the low-poor refractory ores with the grade of 35%-55%, the complex ores and the ferruginous wastes and then separating a high-quality reduced iron product which has the grade more than 90% and is a high-quality furnace material for substituting scrap steel, realizes the resource of the low-poor refractory ores, lays a firm foundation for the reproducibility of resources, lays a foundation for the development of short-process steel making and saves the energy resources from another aspect.

Description

The Apparatus and method for of difficult ore dressing, complex ore and iron-containing waste slag sluicing system reduced iron
Technical field
The invention belongs to metallurgical technology field, the Apparatus and method for of particularly a kind of difficult ore dressing, complex ore and iron-containing waste slag sluicing system reduced iron.
Background technology
China is the large output of steel state of the first in the world, and within 2012, output of steel breaks through 700,000,000 tons, and year produces steel scrap more than 9,000 ten thousand tons, and reduced iron demand is 5,000,000 tons, and China needs import reduced iron 3,000,000 tons every year, and reduced iron (sponge iron) annual production is only 600,000 tons.China is the country that a poor iron ore deposit enriches, low poor slow-witted ore deposit accounts for iron ore deposit more than 97%, but the annual iron ore needed from external import 600,000,000 tons, domestic low poor slow-witted ore deposit in a large number is not well developed, in addition, China also has the iron-containing waste such as sulfate slag, copper ashes, dedusting ash, alumina laterite of more than one hundred million tons to produce every year.Now, China is the country of a mill coal rich reserves, coking coal resource is day by day poor, therefore country puts into effect relevant policies, encourage growth direct-reduced iron and the technological development of Fei Jiao iron-smelting process and application, therefore, the output improving reduced iron and the low poor slow-witted ore deposit developing China a large amount of make its resource utilization extremely urgent.
600,000 tons of reduced irons (sponge iron) that China produces in current year, are mainly produced by more than 200 bar tunnel furnace methods.In China, coal-based tunnel furnace pot type method produces the history that reduced iron (sponge iron) is passed by 30 years, and its comparison of technology is stable, ripe, and small project distribution is relatively general.But because of traditional coal-based tunnel furnace pot type method, expensive fire-resistant can must be adopted; Have that energy consumption is high simultaneously, the recovery time is long, labor force consumes the high and low inferior shortcoming of quality product, cause the practical problemss such as production cost is high, slack market, finally cause the production standstill state of current coal-based tunnel furnace method reduced iron.
The current tunnel furnace method of China, kiln process produce reduced iron product, must adopt the high-quality powdered iron ore of grade more than 66%, and cannot directly apply grade 35% ~ 55% low poor slow-witted ore deposit, complex ore and iron-containing waste, cause the serious waste of resource.
Summary of the invention
For prior art Problems existing, the invention provides the Apparatus and method for of a kind of difficult ore dressing, complex ore and iron-containing waste slag sluicing system reduced iron, object is by providing a kind of novel energy saving kiln equipment, obtain high-grade metal iron, for steel-making provides the high-quality furnace charge that can substitute steel scrap, make low poor slow-witted ore deposit and solid wastes recycling, save energy, enhances productivity simultaneously.
An equipment for difficult ore dressing, complex ore and iron-containing waste slag sluicing system reduced iron, comprises pelletizing material distributing machine, drying grate, backheat blower fan, fine powder bin, rotary kiln, stream sieve and secondary combustion chamber; Pelletizing material distributing machine front is provided with balling disk (-sc), and described pelletizing material distributing machine transports the belt of pelletizing, with drying grate one, between drying grate and rotary kiln, is provided with fine powder bin; Described stream sieve is arranged in fine powder bin, and one end is connected with pelletizing material distributing machine tail end, and the other end is connected with rotary kiln tail end; Described secondary combustion chamber is arranged between drying grate and rotary kiln, and the top of secondary combustion chamber is provided with gas pipeline, and is connected with drying grate top by gas pipeline, and the bottom of drying grate is connected with backheat blower fan, forms flue gas circuit; Equidistantly in the kiln body case of described rotary kiln be furnished with overfire air fan, kiln hood exit is provided with beans spray gun and fine coal spray gun; After rotary kiln, be disposed with water quenching pool, wet-type ball mill, wet magnetic separation unit and high-strength unit of colding pressing, be wherein provided with chain mat machine between water quenching pool and wet-type ball mill.
Described beans lance ejection granularity is the reduction beans of 5 ~ 25mm, and spray gun adopts spray wind mode of movement to spray, and blast 65 ~ 75KPa, jet length is 38 ~ 42m.
Described fine coal lance ejection granularity is the burning pulverized coal of 0.075 ~ 0.096mm.
The air port of described overfire air fan, towards kiln hood, is connected with pipeline, and pipeline inserts in rotary kiln, and is provided with valve on every root pipeline.
The technical scheme realizing the object of the invention is carried out according to following steps:
(1) by difficult ore dressing, complex ore or iron-containing waste fragmentation, be polished into the breeze that-200 order particles account for massfraction more than 85%, with addition of powdered ore quality 6.0 ~ 10.0% auxiliary agent and 0.4 ~ 2.0% binding agent, carry out even mixed grind, water spray pelletizing, obtain the pelletizing of diameter ¢ 8.0mm ~ ¢ 16mm, pelletizing is sent in drying grate and carry out cloth and sintering, backheat blower fan carries out to hot blast, in 1050 ~ 1180 DEG C of sintering 20 ~ 40min, make the agglomerates of sintered pellets that intensity is 300 ~ 400N/ ball, agglomerates of sintered pellets enters rotary kiln by airtight stream sieve, stream sieve sieves out fine powder and the small-particle of below granularity 5mm, by discharging bottom fine powder bin,
(2) agglomerates of sintered pellets enters in rotary kiln in confined conditions, beans spray gun is adopted to spray into the reduction beans that granularity is 5 ~ 25mm, agglomerates of sintered pellets reductase 12 ~ 4h under the condition of temperature 1050 ~ 1100 DEG C, reduction ratio reaches more than 93%, obtains the metallized pellet after reducing;
The fine coal lance ejection granularity of rotary kiln outlet is the burning pulverized coal of 0.075 ~ 0.096mm, metallized pellet is in 1100 ~ 1320 DEG C of insulation 1.5 ~ 2h, enter the slag sluicing system reduction zone of high temperature iron grain growth, metallic iron crystal grain-growth is to 100 μm ~ 3mm, and metallic iron and gangue are assembled respectively;
(3) metallic iron assembled respectively and gangue enter water quenching pool cooling from rotary kiln outlet, wet-type ball mill is entered by chain mat machine after being smashed balling-up block by current, ball block is polished into the powder that-0.075mm accounts for more than 85%, enter wet magnetic separation unit again, isolate gangue and metal iron powder, the metal iron powder grade obtained more than 90%, degree of metalization more than 93%, the rate of recovery is more than 93%;
Metal iron powder, after high-strength cold-pressing balls machine is colded pressing, obtains density at 4.0t/m 3above, granularity is the metallic iron cold pressing block product of 20 ~ 45mm.
Described difficult ore dressing is oolitic hematite, antelope stone iron ore, rhombohedral iron ore, limonite or spathic iron ore; Described complex ore is red soil nickel ore, paigeite or ferrous manganese ore; Described iron-containing waste is sulfate slag, alumina laterite, ferrochrome slag or dedusting ash (mud).
Described auxiliary agent is calcium oxide, calcium carbonate, calcium fluoride mixture; Binding agent is commercial high polymer binder, and main component is Xylo-Mucine or Sodium salts humic acids.
Compared with prior art, feature of the present invention and beneficial effect are:
(1), in the equipment of production reduced iron of the present invention, the flue gas between drying grate and rotary kiln disconnects, and rotary kiln flue gas is rich in CO and H 2temperature is 1100 DEG C ~ 1150 DEG C, secondary combustion chamber is set up in the side of drying grate and rotary kiln junction, secondary combustion chamber top is with addition of air, the high-temperature flue gas of rotary kiln is in top secondary combustion, the upper temp of secondary combustion chamber is made to reach 1200 DEG C ~ 1250 DEG C, be introduced into grate sintering section through high-temperature pipe again and carry out air distribution sintering, the outlet of drying grate is sieved by an airtight stream and is connected with rotary kiln, setting up of secondary combustion chamber, prevent dust in rotary kiln exhaust gas to enter drying grate, will CO and H be rich in simultaneously 2burn, for drying grate provides high temperature sintering gas, ensure that the sintering temperature of pelletizing, also ensure that the control of drying grate and rotary kiln;
(2) in the device of production reduced iron of the present invention, rotary kiln coal-feeding mode is, in the kiln hood exit of rotary kiln, two coal spouting guns are housed, the beans spray gun of the 5 ~ 25mm that jets specially, also reductive agent rifle is, adopt spray wind mode of movement, by the distance of particulate coal spray feed to 18m ~ 40m, beans operational throughput is 1t/h ~ 8t/h, meet the demand of reductive agent completely, and beans falls in broom shape, according to coal particle size, coal can be distributed by different distance, the conveying that particle is large distant, coal particle is little, spray feed distance is shorter, what the reduction coal in whole rotary kiln was distributed is more even, to ensure that in rotary kiln, reducing atmosphere is even, the temperature of rotary kiln end is by another fine coal gun controls, and pulverized coal injection burns, and the temperature in kiln hood exit can be controlled at 1100 DEG C ~ 1320 DEG C,
The temperature control mode of rotary kiln inside is in the kiln body case of the middle front part of rotary kiln, by disposed at equal distance 5 centrifugal blowers, air port is connected with stainless steel tube, stainless steel tube, insert centerline of rotary kiln, air port is towards kiln hood, external often the propping up on stainless steel tube of kiln is equipped with valve, can control air quantity, the temperature of the reduction part of rotary kiln, be lean on the air quantity of 5 typhoon amounts to carry out adjusting kiln temperature.
(3) the inventive method be directly apply grade 35% ~ 55% low poor slow-witted ore deposit, complex ore and iron-containing waste, after its direct-reduction, sub-elect the high-quality reduced iron product of grade more than 90% again, achieve the reproducible utilization of resource, saved the energy from another point of view.
Accompanying drawing explanation
fig. 1 is device schematic diagram of the present invention;
Wherein: 1: balling disk (-sc); 2: pelletizing material distributing machine; 3: drying grate; 4: backheat blower fan; 5: fine powder bin; 6: rotary kiln; 7: stream sieve; 8: overfire air fan; 9: rotary kiln head-shield; 10: beans spray gun; 11: fine coal spray gun; 12: metallized pellet; 13: water; 14: water quenching pool; 15: chain mat machine; 16: wet-type ball mill; 17: wet magnetic separation unit; 18: high-strength cold-pressing balls machine; 19: mine tailing; 20: metal iron powder; 21: cold-pressing balls product; 22: secondary combustion chamber;
Fig. 2 is process flow sheet of the present invention.
Embodiment
Following description drawings and Examples are described further the present invention.
As shown in Figure 1, the equipment of difficult ore dressing, complex ore and iron-containing waste slag sluicing system reduced iron comprises pelletizing material distributing machine 2, drying grate 3, backheat blower fan 4, fine powder bin 5, rotary kiln 6, stream sieve 7 and secondary combustion chamber 22; Pelletizing material distributing machine 2 front is provided with balling disk (-sc) 1, and described pelletizing material distributing machine 2 transports the belt of pelletizing, with drying grate 3 one, is provided with fine powder bin 5 between drying grate 3 and rotary kiln 6; Described stream sieve 7 is arranged in fine powder bin 5, and one end is connected with pelletizing material distributing machine 2 tail end, and the other end is connected with rotary kiln 6 tail end; Described secondary combustion chamber 22 is arranged between drying grate 3 and rotary kiln 6, and the top of secondary combustion 22 Room is provided with gas pipeline, and is connected with drying grate 3 top by gas pipeline, and the bottom of drying grate 3 is connected with backheat blower fan 4, forms flue gas circuit; Equidistantly in the kiln body case of described rotary kiln 6 be furnished with 5 overfire air fans 8, kiln hood is provided with rotary kiln head-shield 9, and kiln hood exit is provided with beans spray gun 10 and fine coal sprays 11 rifles; After rotary kiln 6, be disposed with water quenching pool 14, wet-type ball mill 16, wet magnetic separation unit 17 and high-strength unit 18 of colding pressing, be wherein provided with chain mat machine 15 between water quenching pool 14 and wet-type ball mill 16.
Described beans spray gun 10 sprays the reduction beans that granularity is 5 ~ 25mm, and spray gun adopts spray wind mode of movement to spray, and blast 65 ~ 75KPa, jet length is 18 ~ 40m.
Described fine coal spray gun 11 sprays the burning pulverized coal that granularity is 0.075 ~ 0.096mm.
The air port of described overfire air fan 8, towards kiln hood, is connected with pipeline, and pipeline inserts in rotary kiln, and is provided with valve on every root pipeline.
Adopt aforesaid device carry out difficult ore dressing, complex ore and iron-containing waste slag sluicing system reduced iron time, rotary kiln coal-feeding mode is:
The exit, kiln hood place of rotary kiln, the reduction beans rifle of the special winding-up of beans spray gun 10 5 ~ 25mm, adopts spray wind mode of movement, blast: 65 ~ 75KPa, flow: 35 ~ 40m 3/ min, can by the distance of particulate coal spray feed to 18m ~ 40m, beans operational throughput is 1t/h ~ 8t/h, meets the demand of reductive agent completely, and beans falls in broom shape, according to coal particle size, coal can be distributed by different distance, the conveying that particle is large distant, coal particle is little, spray feed distance is shorter, and what the reduction coal in whole rotary kiln was distributed is relatively more even, to ensure that in rotary kiln, reducing atmosphere is even.
The temperature of rotary kiln end is by pulverized coal gun 11, the temperature in kiln hood exit can be controlled at 1100 DEG C ~ 1320 DEG C.
Kiln temperature control mode is:
In the kiln body case of the middle front part of rotary kiln, by having equidistantly distributed 5 overfire air fans 8, air port is connected with stainless steel tube, stainless steel tube, inserts centerline of rotary kiln, air port is towards kiln hood, external often the propping up on stainless steel tube of kiln is equipped with valve, can control air quantity, the temperature of the reduction part of rotary kiln, lean on the air quantity of 5 typhoon amounts to carry out adjusting kiln temperature, the total head of every Fans: 850 ~ 900Pa, air quantity: 3500 ~ 3800m 3/ h.
Embodiment 1
(1) Inner Mongol sulfate cinder is broken, be polished into the powder that-200 order particles account for massfraction more than 85%, sulfate cinder is containing TFe:55% ~ 58%, with addition of powder quality 6.0% calcium carbonate builder and 0.4% binding agent, carry out even mixed grind, water spray pelletizing, obtain the pelletizing for diameter 8.0 ~ 16mm, pelletizing is sent in drying grate and carry out cloth and sintering, backheat blower fan carries out to hot blast, in 1050 DEG C of sintering 40min, make the agglomerates of sintered pellets that intensity is 300 ~ 400N/ ball, agglomerates of sintered pellets enters rotary kiln by airtight stream sieve, stream sieve sieves out fine powder and the small-particle of below granularity 5mm, by discharging bottom fine powder bin,
(2) agglomerates of sintered pellets enters in rotary kiln in confined conditions, in the kiln body case of control rotary kiln, the blast of overfire air fan is 850Pa, air quantity 3500m3/h, the beans lance ejection granularity of rotary kiln outlet is the reduction beans of 5 ~ 25mm, spray gun adopts spray wind mode of movement to spray, blast 65KPa, flow 35m 3/ min, jet length is 18m, and beans operational throughput is 1t/h, and agglomerates of sintered pellets reduces 4h under the condition of temperature 1050 DEG C, and reduction ratio reaches more than 93%, obtains the metallized pellet after reducing;
The fine coal lance ejection granularity of rotary kiln outlet is the burning pulverized coal of 0.075 ~ 0.096mm, its emitted dose is for controlling rotary kiln temperature out 1100 DEG C, metallized pellet is in 1100 DEG C of insulation 2h, enter the slag sluicing system reduction zone of high temperature iron grain growth, metallic iron crystal grain-growth is to 100 μm ~ 3mm, and metallic iron and gangue are assembled respectively;
(3) metallic iron assembled respectively and gangue enter water quenching pool cooling from rotary kiln outlet, wet-type ball mill is entered by chain mat machine after being smashed balling-up block by current, ball block is polished into-0.075mm and accounts for quality more than 85%, enter wet magnetic separation unit again, isolate gangue and metal iron powder, the metal iron powder grade index obtained is as shown in table 1.
The metal iron powder index that table 1 embodiment 1 obtains
Embodiment 2
(1) Hunan oolitic hematite is broken, be polished into the powder that-200 order particles account for massfraction more than 85%, Hunan oolitic hematite is containing TFe45.45%, with addition of powder quality 8.0% calcium oxide auxiliary agent and 1.0% binding agent, carry out even mixed grind, water spray pelletizing, obtain the pelletizing for diameter 8.0 ~ 16mm, pelletizing is sent in drying grate and carry out cloth and sintering, backheat blower fan carries out to hot blast, in 1180 DEG C of sintering 20min, make the agglomerates of sintered pellets that intensity is 300 ~ 400N/ ball, agglomerates of sintered pellets enters rotary kiln by airtight stream sieve, stream sieve sieves out fine powder and the small-particle of below granularity 5mm, by discharging bottom fine powder bin,
(2) agglomerates of sintered pellets enters in rotary kiln in confined conditions, and in the kiln body case of control rotary kiln, the blast of overfire air fan is 900Pa, air quantity 3800m 3/ h, the beans lance ejection granularity of rotary kiln outlet is the reduction beans of 5 ~ 25mm, spray gun adopts spray wind mode of movement to spray, blast 75KPa, flow 40m3/min, jet length is 40m, and beans operational throughput is 8t/h, agglomerates of sintered pellets reductase 12 h under the condition of temperature 1100 DEG C, reduction ratio reaches more than 93%, obtains the metallized pellet after reducing;
The fine coal lance ejection granularity of rotary kiln outlet is the burning pulverized coal of 0.075 ~ 0.096mm, its emitted dose is for controlling rotary kiln temperature out 1320 DEG C, metallized pellet is in 1320 DEG C of insulation 2h, enter the slag sluicing system reduction zone of high temperature iron grain growth, metallic iron crystal grain-growth is to 100 μm ~ 3mm, and metallic iron and gangue are assembled respectively;
(3) metallic iron assembled respectively and gangue enter water quenching pool cooling from rotary kiln outlet, wet-type ball mill is entered by chain mat machine after being smashed balling-up block by current, ball block is polished into-0.075mm and accounts for quality more than 85%, enter wet magnetic separation unit again, isolate gangue and metal iron powder, the metal iron powder grade index obtained is as shown in table 2.
The metal iron powder index that table 2 embodiment 2 obtains
Embodiment 3
(1) Indonesia's red soil nickel ore is broken, be polished into the powder that-200 order particles account for massfraction more than 85%, Indonesia's red soil nickel ore is containing TFe18.58%, Ni1.8%, with addition of powder quality 10.0% Calcium Fluoride (Fluorspan) auxiliary agent and 2.0% binding agent, carry out even mixed grind, water spray pelletizing, obtain the pelletizing for diameter 8.0 ~ 16mm, pelletizing is sent in drying grate and carry out cloth and sintering, backheat blower fan carries out to hot blast, in 1100 DEG C of sintering 30min, make the agglomerates of sintered pellets that intensity is 300 ~ 400N/ ball, agglomerates of sintered pellets enters rotary kiln by airtight stream sieve, stream sieve sieves out fine powder and the small-particle of below granularity 5mm, by discharging bottom fine powder bin,
(2) agglomerates of sintered pellets enters in rotary kiln in confined conditions, in the kiln body case of control rotary kiln, the blast of overfire air fan is 880Pa, air quantity 3600m3/h, the beans lance ejection granularity of rotary kiln outlet is the reduction beans of 5 ~ 25mm, spray gun adopts spray wind mode of movement to spray, blast 70KPa, flow 38m 3/ min, jet length is 30m, and beans operational throughput is 5t/h, and agglomerates of sintered pellets reduces 1.8h under the condition of temperature 1080 DEG C, and reduction ratio reaches more than 93%, obtains the metallized pellet after reducing;
The fine coal lance ejection granularity of rotary kiln outlet is the burning pulverized coal of 0.075 ~ 0.096mm, its emitted dose is for controlling rotary kiln temperature out 1200 DEG C, metallized pellet is in 1200 DEG C of insulation 1.8h, enter the slag sluicing system reduction zone of high temperature iron grain growth, metallic iron crystal grain-growth is to 100 μm ~ 3mm, and metallic iron and gangue are assembled respectively;
(3) metallic iron assembled respectively and gangue enter water quenching pool cooling from rotary kiln outlet, wet-type ball mill is entered by chain mat machine after being smashed balling-up block by current, ball block is polished into-0.075mm and accounts for quality more than 85%, enter wet magnetic separation unit again, isolate gangue and metal iron powder, the metal iron powder grade index obtained is as shown in table 3.
The metal iron powder index that table 2 embodiment 3 obtains
By above-mentioned metal iron powder or metallic nickel iron powder, adopt high-strength ball press, be cold-pressed into pelletizing, its leading indicator is:

Claims (5)

1. an equipment for difficult ore dressing, complex ore and iron-containing waste slag sluicing system reduced iron, comprises pelletizing material distributing machine, drying grate, backheat blower fan, fine powder bin, rotary kiln and stream sieve, secondary combustion chamber; Pelletizing material distributing machine front is provided with balling disk (-sc), and described pelletizing material distributing machine transports the belt of pelletizing, with drying grate one, between drying grate and rotary kiln, is provided with fine powder bin; Described secondary combustion chamber is arranged between drying grate and rotary kiln, and the top of secondary combustion chamber is provided with gas pipeline, and is connected with drying grate top by gas pipeline, and the bottom of drying grate is connected with backheat blower fan, forms flue gas circuit; It is characterized in that described stream sieve is arranged in fine powder bin, one end is connected with pelletizing material distributing machine tail end, and the other end is connected with rotary kiln tail end; Equidistantly in the kiln body case of described rotary kiln be furnished with overfire air fan, kiln hood exit is provided with beans spray gun and fine coal spray gun, described beans lance ejection granularity is the reduction beans of 5 ~ 25mm, spray gun adopts spray wind mode of movement to spray, blast 65 ~ 75KPa, jet length is 18 ~ 42m, and described fine coal lance ejection granularity is the burning pulverized coal of 0.075 ~ 0.096mm; After rotary kiln, be disposed with water quenching pool, wet-type ball mill, wet magnetic separation unit and high-strength unit of colding pressing, be wherein provided with chain mat machine between water quenching pool and wet-type ball mill.
2. the equipment of a kind of difficult ore dressing according to claim 1, complex ore and iron-containing waste slag sluicing system reduced iron, it is characterized in that the air port of described overfire air fan is towards kiln hood, be connected with pipeline, pipeline inserts in rotary kiln, and is provided with valve on every root pipeline.
3. adopt the method for device fabrication reduced iron of the difficult ore dressing of claim 1, complex ore and iron-containing waste slag sluicing system reduced iron, carry out according to following steps:
(1) by difficult ore dressing, complex ore or iron-containing waste fragmentation, be polished into the breeze that-200 order particles account for massfraction more than 85%, with addition of powdered ore quality 6.0 ~ 10.0% auxiliary agent and 0.4 ~ 2.0% binding agent, carry out even mixed grind, water spray pelletizing, obtain the pelletizing of diameter 8.0 ~ 16mm, pelletizing is sent in drying grate and carry out cloth and sintering, backheat blower fan carries out to hot blast, in 1050 ~ 1180 DEG C of sintering 20 ~ 40min, make the agglomerates of sintered pellets that intensity is 300 ~ 400N/ ball, agglomerates of sintered pellets enters rotary kiln by airtight stream sieve, stream sieve sieves out fine powder and the small-particle of below granularity 5mm, by discharging bottom fine powder bin,
(2) agglomerates of sintered pellets enters in rotary kiln in confined conditions, beans spray gun is adopted to spray into the reduction beans that granularity is 5 ~ 25mm, agglomerates of sintered pellets reductase 12 ~ 4h under the condition of temperature 1050 ~ 1100 DEG C, reduction ratio reaches more than 93%, obtains the metallized pellet after reducing;
The fine coal lance ejection granularity of rotary kiln outlet is the burning pulverized coal of 0.075 ~ 0.096mm, metallized pellet is in 1100 ~ 1320 DEG C of insulation 1.5 ~ 2h, enter the slag sluicing system reduction zone of high temperature iron grain growth, metallic iron crystal grain-growth is to 100 μm ~ 3mm, and metallic iron and gangue gather respectively;
(3) metallic iron gathered respectively and gangue enter water quenching pool cooling from rotary kiln outlet, wet-type ball mill is entered by chain mat machine after being smashed balling-up block by current, ball block is polished into the powder that-0.075mm accounts for more than 85%, enter wet magnetic separation unit again, isolate gangue and metal iron powder, the metal iron powder grade obtained more than 90%, degree of metalization more than 93%, the rate of recovery is more than 93%;
Metal iron powder, after high-strength cold-pressing balls machine is colded pressing, obtains density at 4.0t/m 3above, granularity is the metallic iron cold pressing block product of 20 ~ 45mm.
4. the method for the device fabrication reduced iron of the difficult ore dressing of employing according to claim 3, complex ore and iron-containing waste slag sluicing system reduced iron, is characterized in that described difficult ore dressing is antelope stone iron ore, rhombohedral iron ore, limonite or spathic iron ore; Described complex ore is red soil nickel ore, paigeite or ferrous manganese ore; Described iron-containing waste is sulfate slag, alumina laterite, ferrochrome slag or dedusting ash.
5. the method for the device fabrication reduced iron of the difficult ore dressing of employing according to claim 3, complex ore and iron-containing waste slag sluicing system reduced iron, is characterized in that described auxiliary agent is calcium oxide, calcium carbonate or Calcium Fluoride (Fluorspan); Binding agent is commercial high polymer binder, and main component is Xylo-Mucine or Sodium salts humic acids.
CN201310189325.4A 2013-05-21 2013-05-21 Equipment and method for carrying out slag-iron separation and iron reduction on refractory ore, complex ore and chemical industry ferruginous waste Active CN103290161B (en)

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