CN104726699A - High-strength composite metallized pellets produced by using iron-containing metallurgical dust and production process thereof - Google Patents
High-strength composite metallized pellets produced by using iron-containing metallurgical dust and production process thereof Download PDFInfo
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Abstract
The invention relates to the technical field of metallurgy and mineral engineering and discloses high-strength composite metallized pellets produced by using iron-containing metallurgical dust and a production process thereof. Each high-strength composite metallized pellet comprises an internal core and an external shell, wherein the internal core is composed of iron-containing metallurgical dust, the iron-containing metallurgical dust is a mixture of blast furnace gas dust, converter OG sludge and converter secondary dust removing dust which are in a mass ratio of 650:(580-610):(55-70), the external shell is made from a mixture of iron ore concentrate and bentonite which are in a mass ration of 650:(13-18), the mass ratio of the iron-containing metallurgical dust to iron ore concentrate is (60-65):(35-40), the particle size of the internal core is 20-25mm, and the thickness of the external shell is 5-10mm. The preparation process of the high-strength composite metallized pellet comprises the following steps: preparing internal cores; coating the internal cores with the external shells to obtain composite metallized pellets; distributing and drying the composite metallized pellets; carrying out reduction roasting on the composite metallized pellets; cooling the high-temperature reduced composite metallized pellets; and sorting. Each prepared composite metallized pellet has the advantages that the metallization rate is high up to 90% or above and the compressive strength is higher than 1600N/ball. The waste iron-containing metallurgical dust can be recycled and used and therefore environmental pollution is reduced.
Description
Technical field
The present invention relates to metallurgical and mineral engineering technology field, disclose a kind of utilize iron containing metallurgical dust to produce high-intensity composite metal pellet and production technique.
Background technology
Iron containing metallurgical dust is the solid ferruginous material that the kind produced in Iron And Steel Industry production process is many, composition is assorted, total generation accounts for 5 ~ 6% of iron and steel output, mainly contains: sintering dust separation ash, pelletizing dedusting ash, blast furnace dust, converter OG sludge, steel-making dedusting ash, casting house control of dust etc.The main component of iron containing metallurgical dust is iron, and its iron-holder is 30 ~ 65%, and carbon content is 15 ~ 35%, simultaneously containing alkali metals such as certain K, Na, Zn.
In iron and steel enterprise, ironmaking and steel making dust slime in Zn mainly with ZnO form exist, when iron containing metallurgical dust for sinter with addition of time, the ZnO contained in material still can be deposited in agglomerate, finally cause the circulation collection of zinc in blast furnace, affect the normal production of blast furnace.Therefore enterprise is except partial metallurgical ion dust mud contaning uses in sintered material, all the other dirt mud bulk depositions, fails to develop.
The main rotary hearth furnace that adopts carries out direct-reduction process to metallurgical dust sludge both at home and abroad at present, the metallized pellet produced is for iron-smelting blast furnace or steel-making converter, there is investment large, separate unit makes an investment in about 200,000,000 yuan, separate unit processing power about 200,000 tons/year, degree of metalization is about 65% problem, not yet wide popularization and application.
Summary of the invention
The object of this invention is to provide a kind of utilize iron containing metallurgical dust to produce high-intensity composite metal pellet and production technique, using discarded iron containing metallurgical dust as raw materials for production, produce composition metal pellet, for blast furnace adjustment burden structure provides prereduced burden, to solve the problem that a large amount of iron containing metallurgical dusts can not be recycled.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
A kind of high-intensity composite metal pellet utilizing iron containing metallurgical dust to produce, for blast furnace or converter smelting furnace charge, it comprises kernel, be wrapped in the shell of kernel outside, described kernel is made up of iron containing metallurgical dust, described iron containing metallurgical dust is by blast furnace dust, converter OG sludge, secondary BOF dedusting system ash is in mass ratio for the ratio of 650:580 ~ 610:55 ~ 70 mixes, the ratio that described shell is 650:13 ~ 18 by iron ore concentrate and wilkinite in mass ratio mixes, the mass ratio of described iron containing metallurgical dust and described iron ore concentrate is 60 ~ 65:35 ~ 40, the granularity of described kernel is 20 ~ 25mm, the thickness of described shell is 5 ~ 10mm.
As a further improvement on the present invention, the outside of described shell is also coated with one deck reductive agent.
Further improve as of the present invention, described reductive agent is coal powder, and its quality is 5 ~ 8% of Iron Concentrate Quality in described shell, and wherein granularity is that the mass percentage content of-120 object coal powder particles is greater than 80%.
Further improve as of the present invention, the Iron grade of described iron ore concentrate be 54 ~ 66%, SiO
2content 2 ~ 15%, wherein granularity is that the mass percentage content of-200 object iron ore concentrate particles is greater than 80%.
Further improve as of the present invention, in described coal powder, the mass percent of fixed carbon, ash content, volatile matter is 72 ~ 76:11 ~ 15:11 ~ 14.
Further improve as of the present invention, in described high-intensity composite metal pellet, degree of metalization is greater than 90%, and ultimate compression strength is greater than 1600N/ ball.
A production technique for the high-intensity composite metal pellet utilizing iron containing metallurgical dust to produce as above, it comprises the following steps:
Step one, prepare kernel, blast furnace dust, converter OG sludge, secondary BOF dedusting system ash are prepared kernel iron containing metallurgical dust for the ratio of 650:580 ~ 610:55 ~ 70 is prepared burden and mixed formation in mass ratio, iron containing metallurgical dust is joined in balling disc, the moisture adding mixture total mass 7 ~ 10% carries out disk or cylinder pelletizing, and the granularity controlling kernel is 20 ~ 25mm;
Step 2, parcel shell form composition metal pellet, the ratio being 650:13 ~ 18 in mass ratio by iron ore concentrate and wilkinite is prepared burden and mixes, kernel step one produced puts into this mixture, pelletizing disk or cylinder is adopted evenly to be wrapped in by mixture on the outer wall of described kernel, form described shell, the thickness of shell is 5 ~ 10mm, obtain the wet composition metal pellet that granularity is 25 ~ 35mm, wherein the mass ratio of iron containing metallurgical dust described in step one and described iron ore concentrate is 60 ~ 65:35 ~ 40;
Step 3, composition metal pellet outer wall parcel reducing zone, the wet composition metal pellet prepared in described step 2 is put into the coal powder that quality is Iron Concentrate Quality 5 ~ 8%, adopt balling disc to make its outside uniform fold one deck coal powder, form reducing zone;
The cloth of step 4, composition metal pellet is with dry, bottom the kiln car of reduction kiln, periphery lays the carbon residue of one deck 10 ~ 20mm thickness or the lower coal of volatile matter, the mode of hierarchical classification cloth is adopted to be laid on kiln car composition metal pellet, the capping coal of one deck 10 ~ 20mm thickness is laid, standing and drying at the upper epidermis of composition metal pellet;
The reducing roasting of step 5, composition metal pellet, dried composition metal pellet through the direct-reduction of excess temperature 1150 ~ 1250 DEG C, recovery time 90 ~ 120min and high-temperature concretion, obtains high temperature reduction composition metal pellet in reduction kiln;
The cooling of step 6, high temperature reduction composition metal pellet and sorting, carry out magnetic material and non-magnetic material sorting after the high temperature reduction composition metal pellet anaerobic of step 5 gained is cooled to normal temperature, obtain the high-intensity composite metal pellet product that degree of metalization is greater than 90%, ultimate compression strength is greater than 1600N/ ball.
Further improve as of the present invention, when described composition metal pellet in reducing roasting time adopt outer join reductive agent time, described step 3 can be omitted, according to the grade of iron ore concentrate during the reducing roasting of described step 5 composition metal pellet, reduction kiln also in allocate the reduction coal of described composition metal pellet quality 15 ~ 20% into.
Further improve as of the present invention, described reduction kiln is tunnel furnace or car bottom furnace or batch-type furnace.
Composition metal pellet grading principle of the present invention: according to volume particle size pelletizing in reduction stove after cloth, hole between pelletizing is larger, be conducive to the radiative transfer between pelletizing levels, reduce the heat transfer resistance of material and the temperature difference of levels material, make whole material through-thickness obtain homogeneous reduction, realize the reducing roasting of deep bed sintering.But when the granularity of pelletizing is more than 40mm, the heat that increase and pelletizing reduction due to pelletizing internal heat transfer thermal resistance need absorption certain, the internal-external temperature difference of pelletizing increases, and the reduction temperature of its kernel is lower, affects the reduction rate of kernel and goes back proper mass thereupon.When pellet size is less than 20mm, in pelletizing ironmaking and ratio shared by steel making dust slime less, the iron containing metallurgical dust amount handled by the present invention declines, and between pelletizing, radiative transfer amount reduces simultaneously, is unfavorable for the pelletizing reduction of deep bed sintering.In addition, when the composition metal pellet that the present invention produces utilizes as blast furnace burden, for improving the ventilation property of blast furnace, the granularity of metallized pellet should increase as far as possible.Therefore, be 25 ~ 35mm by the granularity selection of composition metal pellet of the present invention.
In the present invention, the kernel of composition metal pellet is made up of blast furnace dust, converter OG sludge, secondary BOF dedusting system ash, potassium and sodium mainly exist with the form of salt of wormwood or sodium carbonate in composition metal pellet, due to salt of wormwood fusing point be 891 DEG C, sodium carbonate fusing point is 854 DEG C, when salt of wormwood and sodium carbonate are dissolved in after in mixture, the expansion of mixture will be caused.The present invention by the proportioning of blast furnace dust, converter OG sludge, secondary BOF dedusting system ash three kinds of iron containing metallurgical dusts in adjustment kernel, utilize that carbon content in blast furnace dust is higher, in converter OG sludge Iron grade and CaO content higher, SiO in secondary BOF dedusting system ash
2the feature that content is higher, makes the kernel of composition metal pellet, can form certain slag phase in high temperature reduction process, weakens the trend that mixture expands; Simultaneously wrap up at kernel outside surface the shell that one deck iron ore concentrate and wilkinite form, when high-temperature roasting, iron ore concentrate is first reduced into metallic iron, metallic iron crystallization forms the metal shell with some strength, effectively can suppress the expansion of kernel, make whole composition metal pellet keep complete ball-type, and there is higher intensity.
Composition metal pellet reducing process of the present invention not only make use of original carbon in the batching of kernel, also use the outer reducing zone wrapped up in reductive agent technology and form at wet bulb surface parcel one deck coal, can make Large stone composition metal pellet in high temperature reduction process inside and outside obtain homogeneous reduction simultaneously, accelerate reduction rate, shorten the recovery time.
Containing higher zinc oxide in the iron containing metallurgical dust that the present invention is used, under the high temperature and reducing atmosphere of reduction stove, zinc oxide is reduced into metallic zinc, fusing point due to metallic zinc is 419.53 DEG C, boiling point is 907 DEG C, the metallic zinc generated gasifies under furnace high-temperature, and discharges with flue gas with the form of zinc fume.Zinc fume zinc in flue gas cools process again be oxidized, and generates zinc oxide solid particulate, and zinc oxide, after collecting, can obtain the byproduct containing zinc oxide content 40 ~ 65%.Therefore, in metallized pellet production process, this technique has dezincify and receives zinc function.
The present invention carries out in production kernel at employing blast furnace dust, converter OG sludge, secondary BOF dedusting system ash mixture, the feature comparatively thin according to converter OG sludge granularity, CaO content is higher, carrying out kernel production when being unworthy of adding additives, reducing production cost.
Beneficial effect of the present invention is:
(1) iron containing metallurgical dust that, the present invention makes iron and steel enterprise produce obtains effective utilization, decrease iron containing metallurgical dust and pile up the environmental pollution caused, and technique wall scroll production line less investment of the present invention, only 2,000 ten thousand yuan/bar, yearly capacity can reach 10 ~ 150,000 tons;
(2), volume particle size composite pellet ore production technology of the present invention, solve the problem of internal heat transfer in composition metal pellet reduction process and also proper mass inequality, the degree of metalization of composition metal pellet can be made to reach more than 90%, blast furnace thick furnace charge air permeability in use procedure is good, composition metal pellet basic metal decreasing ratio is higher, adds the usage quantity of blast furnace with addition of iron containing metallurgical dust;
(3), the present invention by wrap up in outside composition metal pellet kernel iron ore concentrate formed composite pellet, solve the expansion issues of iron containing metallurgical dust in reducing roasting process;
(4), the present invention by carrying out direct-reduction process to iron containing metallurgical dust, produce composition metal pellet, for blast furnace adjustment burden structure prereduced burden is provided, reduce ratio of putting coke into furnace further, when blast furnace allocation ratio reaches 10%, coke ratio 8% can be reduced.
Accompanying drawing explanation
Fig. 1 is the structural representation utilizing iron containing metallurgical dust production high-intensity composite metal pellet in embodiment 1;
Fig. 2 is the process flow sheet utilizing iron containing metallurgical dust production high-intensity composite metal pellet in embodiment 1;
Fig. 3 is the structural representation utilizing iron containing metallurgical dust production high-intensity composite metal pellet in embodiment 2;
Fig. 4 is the process flow sheet utilizing iron containing metallurgical dust production high-intensity composite metal pellet in embodiment 2.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further detailed explanation.
Embodiment 1
A kind of high-intensity composite metal pellet utilizing iron containing metallurgical dust to produce as shown in Figure 1, for blast furnace or converter smelting furnace charge, it comprises kernel 1, be wrapped in the shell 2 of kernel 1 outside, kernel 1 is made up of iron containing metallurgical dust, iron containing metallurgical dust is by blast furnace dust, converter OG sludge, secondary BOF dedusting system ash is in mass ratio for the ratio of 650:580 ~ 610:55 ~ 70 mixes, the ratio that shell 2 is 650:13 ~ 18 by iron ore concentrate and wilkinite in mass ratio mixes, the mass ratio of iron containing metallurgical dust and iron ore concentrate is 60 ~ 65:35 ~ 40, the granularity of kernel 1 is 20 ~ 25mm, the thickness of shell 2 is 5 ~ 10mm.The outside of shell 2 is also coated with one deck coal powder as reductive agent 3.The quality of coal powder is 5 ~ 8% of Iron Concentrate Quality in shell 2, and wherein granularity is that the mass percentage content of-120 object coal powder particles is greater than 80%.
The Iron grade of iron ore concentrate is 54 ~ 66%, SiO
2content 2 ~ 15%, wherein granularity is that the mass percentage content of-200 object iron ore concentrate particles is greater than 80%.
In coal powder, the mass percent of fixed carbon, ash content, volatile matter is 72 ~ 76:11 ~ 15:11 ~ 14.
In high-intensity composite metal pellet, degree of metalization is greater than 90%, and ultimate compression strength is greater than 1600N/ ball.
The production technique of a kind of high-intensity composite metal pellet utilizing iron containing metallurgical dust to produce as shown in Figure 2, it comprises the following steps:
Step one, prepare kernel, blast furnace dust, converter OG sludge, secondary BOF dedusting system ash are prepared kernel iron containing metallurgical dust for the ratio of 650:580 ~ 610:55 ~ 70 is prepared burden and mixed formation in mass ratio, iron containing metallurgical dust is joined in balling disc, the moisture adding mixture total mass 7 ~ 10% carries out disk or cylinder pelletizing, and the granularity controlling kernel is 20 ~ 25mm;
Step 2, parcel shell form composition metal pellet, the ratio being 650:13 ~ 18 in mass ratio by iron ore concentrate and wilkinite is prepared burden and mixes, kernel step one produced puts into this mixture, pelletizing disk or cylinder is adopted evenly to be wrapped on the outer wall of kernel by mixture, form shell, the thickness of shell is 5 ~ 10mm, obtain the wet composition metal pellet that granularity is 25 ~ 35mm, wherein in step one, the mass ratio of iron containing metallurgical dust and iron ore concentrate is 60 ~ 65:35 ~ 40;
Step 3, composition metal pellet outer wall parcel reducing zone, puts into the wet composition metal pellet prepared in step 2 the coal powder that quality is Iron Concentrate Quality 5 ~ 8%, adopts balling disc to make its outside uniform fold one deck coal powder, forms reducing zone;
The cloth of step 4, composition metal pellet is with dry, bottom the kiln car of reduction kiln, periphery lays the carbon residue of one deck 10 ~ 20mm thickness or the lower coal of volatile matter, the mode of hierarchical classification cloth is adopted to be laid on kiln car composition metal pellet, the capping coal of one deck 10 ~ 20mm thickness is laid, standing and drying at the upper epidermis of composition metal pellet;
The reducing roasting of step 5, composition metal pellet, dried composition metal pellet through the direct-reduction of excess temperature 1150 ~ 1250 DEG C, recovery time 90 ~ 120min and high-temperature concretion, obtains high temperature reduction composition metal pellet in reduction kiln;
The cooling of step 6, high temperature reduction composition metal pellet and sorting, carry out magnetic material and non-magnetic material sorting after the high temperature reduction composition metal pellet anaerobic of step 5 gained is cooled to normal temperature, obtain the high-intensity composite metal pellet product that degree of metalization is greater than 90%, ultimate compression strength is greater than 1600N/ ball.
Embodiment 2
A kind of high-intensity composite metal pellet utilizing iron containing metallurgical dust to produce as shown in Figure 3, for blast furnace or converter smelting furnace charge, it comprises kernel 1, be wrapped in the shell 2 of kernel 1 outside, it is characterized in that: kernel 1 is made up of iron containing metallurgical dust, iron containing metallurgical dust is by blast furnace dust, converter OG sludge, secondary BOF dedusting system ash is in mass ratio for the ratio of 650:580 ~ 610:55 ~ 70 mixes, the ratio that shell 2 is 650:13 ~ 18 by iron ore concentrate and wilkinite in mass ratio mixes, the mass ratio of iron containing metallurgical dust and iron ore concentrate is 60 ~ 65:35 ~ 40, the granularity of kernel 1 is 20 ~ 25mm, the thickness of shell 2 is 5 ~ 10mm.
The Iron grade of iron ore concentrate is 54 ~ 66%, SiO
2content 2 ~ 15%, wherein granularity is that the mass percentage content of-200 object iron ore concentrate particles is greater than 80%.
In high-intensity composite metal pellet, degree of metalization is greater than 90%, and ultimate compression strength is greater than 1600N/ ball.
The production technique of a kind of high-intensity composite metal pellet utilizing iron containing metallurgical dust to produce as shown in Figure 4, it comprises the following steps:
Step one, prepare kernel, blast furnace dust, converter OG sludge, secondary BOF dedusting system ash are prepared kernel iron containing metallurgical dust for the ratio of 650:580 ~ 610:55 ~ 70 is prepared burden and mixed formation in mass ratio, iron containing metallurgical dust is joined in balling disc, the moisture adding mixture total mass 7 ~ 10% carries out disk or cylinder pelletizing, and the granularity controlling kernel is 20 ~ 25mm;
Step 2, parcel shell form composition metal pellet, the ratio being 650:13 ~ 18 in mass ratio by iron ore concentrate and wilkinite is prepared burden and mixes, kernel step one produced puts into this mixture, pelletizing disk or cylinder is adopted evenly to be wrapped on the outer wall of kernel by mixture, form shell, the thickness of shell is 5 ~ 10mm, obtain the wet composition metal pellet that granularity is 25 ~ 35mm, wherein in step one, the mass ratio of iron containing metallurgical dust and iron ore concentrate is 60 ~ 65:35 ~ 40;
The cloth of step 3, composition metal pellet is with dry, bottom the kiln car of reduction kiln, periphery lays the carbon residue of one deck 10 ~ 20mm thickness or the lower coal of volatile matter, the mode of hierarchical classification cloth is adopted to be laid on kiln car composition metal pellet, the capping coal of one deck 10 ~ 20mm thickness is laid, standing and drying at the upper epidermis of composition metal pellet;
The reducing roasting of step 4, composition metal pellet, dried composition metal pellet in reduction kiln through the direct-reduction of excess temperature 1150 ~ 1250 DEG C, recovery time 90 ~ 120min and high-temperature concretion, simultaneously according to the grade of iron ore concentrate, when reduction kiln reducing roasting, the interior reduction coal allocating composition metal pellet quality 15 ~ 20% into, obtains high temperature reduction composition metal pellet;
The cooling of step 5, high temperature reduction composition metal pellet and sorting, carry out magnetic material and non-magnetic material sorting after the high temperature reduction composition metal pellet anaerobic of step 4 gained is cooled to normal temperature, obtain the high-intensity composite metal pellet product that degree of metalization is greater than 90%, ultimate compression strength is greater than 1600N/ ball.
In above two embodiments, reduction kiln is tunnel furnace or car bottom furnace or batch-type furnace.
The present invention is by utilizing iron containing metallurgical dust production high-intensity composite metal pellet, its degree of metalization reaches more than 90%, ultimate compression strength is greater than 1600N/ ball, the service requirements of blast furnace with addition of furnace charge can be met, discarded iron containing metallurgical dust is recycled, achieve energy-saving and emission-reduction, reduce environmental pollution.
Claims (9)
1. the high-intensity composite metal pellet utilizing iron containing metallurgical dust to produce, for blast furnace or converter smelting furnace charge, it comprises kernel (1), be wrapped in the shell (2) that kernel (1) is outside, it is characterized in that: described kernel (1) is made up of iron containing metallurgical dust, described iron containing metallurgical dust is by blast furnace dust, converter OG sludge, secondary BOF dedusting system ash is in mass ratio for the ratio of 650:580 ~ 610:55 ~ 70 mixes, the ratio that described shell (2) is 650:13 ~ 18 by iron ore concentrate and wilkinite in mass ratio mixes, the mass ratio of described iron containing metallurgical dust and described iron ore concentrate is 60 ~ 65:35 ~ 40, the granularity of described kernel (1) is 20 ~ 25mm, the thickness of described shell (2) is 5 ~ 10mm.
2. the high-intensity composite metal pellet utilizing iron containing metallurgical dust to produce according to claim 1, is characterized in that: the outside of described shell (2) is also coated with one deck reductive agent (3).
3. the high-intensity composite metal pellet utilizing iron containing metallurgical dust to produce according to claim 2, it is characterized in that: described reductive agent (3) is coal powder, its quality is 5 ~ 8% of Iron Concentrate Quality in described shell (2), and wherein granularity is that the mass percentage content of-120 object coal powder particles is greater than 80%.
4. the high-intensity composite metal pellet utilizing iron containing metallurgical dust to produce according to claim 1 or 2 or 3, is characterized in that: the Iron grade of described iron ore concentrate is 54 ~ 66%, SiO
2content 2 ~ 15%, wherein granularity is that the mass percentage content of-200 object iron ore concentrate particles is greater than 80%.
5. the high-intensity composite metal pellet utilizing iron containing metallurgical dust to produce according to claim 1 or 2 or 3, is characterized in that: in described coal powder, the mass percent of fixed carbon, ash content, volatile matter is 72 ~ 76:11 ~ 15:11 ~ 14.
6. the high-intensity composite metal pellet utilizing iron containing metallurgical dust to produce according to claim 1 or 2 or 3, is characterized in that: in described high-intensity composite metal pellet, degree of metalization is greater than 90%, and ultimate compression strength is greater than 1600N/ ball.
7. the production technique of a kind of high-intensity composite metal pellet utilizing iron containing metallurgical dust to produce according to claim 1, is characterized in that: it comprises the following steps:
Step one, prepare kernel, blast furnace dust, converter OG sludge, secondary BOF dedusting system ash are prepared kernel iron containing metallurgical dust for the ratio of 650:580 ~ 610:55 ~ 70 is prepared burden and mixed formation in mass ratio, iron containing metallurgical dust is joined in balling disc, the moisture adding mixture total mass 7 ~ 10% carries out disk or cylinder pelletizing, and the granularity controlling kernel is 20 ~ 25mm;
Step 2, parcel shell form composition metal pellet, the ratio being 650:13 ~ 18 in mass ratio by iron ore concentrate and wilkinite is prepared burden and mixes, kernel step one produced puts into this mixture, pelletizing disk or cylinder is adopted evenly to be wrapped in by mixture on the outer wall of described kernel, form described shell, the thickness of shell is 5 ~ 10mm, obtain the wet composition metal pellet that granularity is 25 ~ 35mm, wherein the mass ratio of iron containing metallurgical dust described in step one and described iron ore concentrate is 60 ~ 65:35 ~ 40;
Step 3, composition metal pellet outer wall parcel reducing zone, the wet composition metal pellet prepared in described step 2 is put into the coal powder that quality is Iron Concentrate Quality 5 ~ 8%, adopt balling disc to make its outside uniform fold one deck coal powder, form reducing zone;
The cloth of step 4, composition metal pellet is with dry, bottom the kiln car of reduction kiln, periphery lays the carbon residue of one deck 10 ~ 20mm thickness or the lower coal of volatile matter, the mode of hierarchical classification cloth is adopted to be laid on kiln car composition metal pellet, the capping coal of one deck 10 ~ 20mm thickness is laid, standing and drying at the upper epidermis of composition metal pellet;
The reducing roasting of step 5, composition metal pellet, dried composition metal pellet through the direct-reduction of excess temperature 1150 ~ 1250 DEG C, recovery time 90 ~ 120min and high-temperature concretion, obtains high temperature reduction composition metal pellet in reduction kiln;
The cooling of step 6, high temperature reduction composition metal pellet and sorting, carry out magnetic material and non-magnetic material sorting after the high temperature reduction composition metal pellet anaerobic of step 5 gained is cooled to normal temperature, obtain the high-intensity composite metal pellet product that degree of metalization is greater than 90%, ultimate compression strength is greater than 1600N/ ball.
8. the production technique of the high-intensity composite metal pellet utilizing iron containing metallurgical dust to produce according to claim 7, it is characterized in that: when described composition metal pellet in reducing roasting time adopt outer join reductive agent time, described step 3 can be omitted, according to the grade of iron ore concentrate during the reducing roasting of described step 5 composition metal pellet, reduction kiln also in allocate the reduction coal of described composition metal pellet quality 15 ~ 20% into.
9. the production technique of the high-intensity composite metal pellet utilizing iron containing metallurgical dust to produce according to claim 7, is characterized in that: described reduction kiln is tunnel furnace or car bottom furnace or batch-type furnace.
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