CN115652078A - Ore return mosaic sintering process - Google Patents
Ore return mosaic sintering process Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 47
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- 238000002156 mixing Methods 0.000 claims abstract description 40
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 26
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- 229910052742 iron Inorganic materials 0.000 claims description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 3
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Abstract
The invention provides a return mine mosaic sintering process, which comprises the following steps: preparing materials, primary mixing, secondary mixing and granulating, distributing materials, igniting, sintering, crushing and cooling, screening and detecting indexes of sinter ore; wherein the bedding materials prepared in the ingredients comprise: 30 to 35 portions of return ores, 3.5 to 4.0 portions of coke powder, 5.5 to 7.0 portions of quicklime, 2.0 to 3.0 portions of dolomite powder and 51 to 53 portions of mixed powder; screening the return ores before the first mixing step, mixing and granulating the return ores with the granularity of 0-3 mm, the coke powder, the quicklime, the dolomite powder and the mixed powder for the first mixing and the second mixing to obtain a second mixed sintering material, then mixing the return ores with the granularity of 3-7 mm and the second mixed sintering material for the second mixing, and performing subsequent processes. The process of the invention ensures that the sintering yield, the sintering strength and the metallurgical performance are all kept better at the same time.
Description
Technical Field
The invention relates to the technical field of ferrous metallurgy, in particular to a return mine inlay sintering process.
Background
With the gradual improvement of the requirements of blast furnace production on sintered mineral products and quality, the efficient utilization of mineral resources becomes a consensus of researchers. The return ores are internal circulation materials in the sintering process, the return ores refer to sintering ores which are not completely burned, the sintering ores comprise sintering ores along two sides and the surface layer of a sintering machine trolley, powder generated after mechanical load is applied, dust, mud and the like recovered by environmental dust removal need to be returned to fine powder in the sintering process, the size of the fine powder is generally smaller than 5-6mm, and the high proportion of the addition amount of the return ores can have great influence on the sintering process and the amount of the sintered minerals.
The return mine inlay sintering is a new sintering process, and the Ge Xirong of the northeast university of Japan firstly proposes an inlay type iron ore sintering technology, and the process uses malamanba ore to prepare green balls which are uniformly distributed in a sintering material layer, so that the sintering material layer forms a proper gap structure, thereby achieving the effects of changing the quality of the sintering ore and improving the yield of the sintering ore.
However, the research on the existing return fine mosaic sintering technology is relatively few, the research on the return fine mosaic technology suitable for the existing raw fuel conditions is suitable, the air permeability and sintering efficiency of a material layer are further improved, the sintering effect is enhanced, and the sintering yield is improved, so that the method is the key for reducing the production pressure of a sintering plant.
Disclosure of Invention
The invention provides a return ore inlay sintering process for overcoming the defects in the prior art, so that the sintering yield, the sintering strength and the metallurgical performance are all kept better at the same time.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a return mine mosaic sintering process, which comprises the following steps: preparing materials, primary mixing, secondary mixing and granulating, distributing materials, igniting, sintering, crushing and cooling, screening and detecting indexes of sinter ore; wherein the bedding materials prepared in the ingredients comprise: 30 to 35 portions of return ores, 3.5 to 4.0 portions of coke powder, 5.5 to 7.0 portions of quicklime, 2.0 to 3.0 portions of dolomite powder and 51 to 53 portions of mixed powder; screening the return ores before the first mixing step, performing first mixing and second mixing granulation on the return ores with the granularity of 0-3 mm, the coke powder, the quicklime, the dolomite powder and the mixed powder to obtain second mixed sintering materials, then uniformly mixing the return ores with the granularity of 3-7 mm and the second mixed sintering materials, and performing subsequent processes. In the invention, the return ores with the granularity of 3-7 mm do not participate in the step of primary mixing and secondary mixing granulation, and are directly added into the sintering material after secondary mixing granulation.
Preferably, the return ores in the bedding material are sintered ores with the granularity smaller than 7mm.
Preferably, the mixed powder comprises the following components in percentage by weight: 68% of fine powder, 19% of mineral powder, 11% of iron-containing recovery sundries and 2% of steel slag.
Preferably, the bedding materials prepared in the ingredients comprise: 35 parts of return ores, 3.9 parts of coke powder, 6.8 parts of quicklime, 2.8 parts of dolomite powder and 51.5 parts of uniformly mixed powder.
Preferably, the chemical components of the bedding material sintering mineralizing are as follows: alkalinity R of (2.2-2.7), TFe (47.0-50.0)%, siO 2 (5.0～5.8)％，CaO(13～17)％，MgO(2.6～3.0)％，Al 2 O 3 (2.5～3.5)％，S(0.07～0.12)％，P(0.06～0.12)％，TiO 2 (4.0～5.8)％，V 2 O 5 (0.3-0.45)%. R refers to the basicity of the sinter, i.e. CaO percentage/SiO in the sinter 2 Percent, R = CaO/SiO 2 。
More preferably, the bedding material sintering mineralogy comprises the following chemical components: alkalinity R of 2.64, TFe 48.51 percent and SiO 2 5.66％，CaO 14.91％，MgO 2.81％，Al 2 O 3 2.7％，S 0.09％，P 0.083％，TiO 2 4.26％，V 2 O 5 0.38％。
It should be noted that the return ores with the grain size of 3-7 mm are uniformly mixed with the two-mixed sintering material, so as to obtain the return ore inlay, wherein the grain size is the return ore inlay grain size.
Preferably, the granularity of the return fine inlay is 3-5 mm.
Preferably, the return fine mosaic ratio is 40-100%; namely 40-100% of the return fine with the granularity of 3-7 mm is used for inlaying. More preferably, the return fine mosaic ratio is 40-80%; more preferably, the return fine mosaic ratio is 80%.
Wherein, the sinter bed is evenly divided into an upper layer, a middle layer and a lower layer, and the return ores are inlaid into different layers.
Preferably, the return mine inlaying position is a lower layer or a middle-lower layer of the sintering layer.
More preferably, the return fine inlaid position is a middle-lower layer of the sintering layer.
In the return-ore inlaid sintering process of the invention:
preferably, the first mixing time is 4min.
Preferably, the water adding amount in the first mixing process is 7% of the mass of the bedding material.
Preferably, the time for granulating the mixture is 5min.
Preferably, the water accounting for 0.5 to 1 percent of the mass of the first mixed material is added in the second mixing granulation process.
Preferably, the thickness of the sinter bed in the sintering process is 750-800 mm.
Preferably, the ignition temperature is 1150 ℃, the ignition time is 1min, and the ignition negative pressure is 11kPa in the ignition process.
Preferably, the sintering negative pressure in the sintering process is 16kPa.
The invention has the beneficial effects that:
in the return fine inlaying process, when the inlaid return fine granularity is 3-7 mm, the return fine can form a proper gap structure with the sintering material after the two-mixing granulation, the vertical sintering speed and the utilization coefficient can be kept better, so that the better sintering yield is obtained, and when the inlaid return fine granularity is 3-5 mm, the best effect is achieved; the return fine mosaic granularity of 3-7 mm can obtain better strength of the sinter while keeping higher sintering yield, the grain size distribution of the sinter is more uniform, wherein when the mosaic granularity of the return fine is 3-5 mm, the best strength is achieved, the strength is about 67%, the mosaic granularity of the return fine has no obvious influence on the metallurgical performance of the sinter, and the return fine with the granularity of 3-7 mm can ensure that the sinter has good metallurgical performance.
The invention researches different return ore inlaying proportions, along with the increase of the inlaying proportion, the air permeability of the whole material layer gradually becomes better, the higher the inlaying proportion is, the better the air permeability of the material layer is, if the better sintering yield and sintering strength are obtained at the same time, the return ore inlaying proportion is 40-100%. Wherein, as the marbling proportion of return ores is increased from 20% to 80%, the vertical sintering speed and the sintering utilization coefficient are in an increasing trend, the vertical sintering speed is increased by about 4.5mm/min, and the sintering utilization coefficient is increased by about 0.5t/m 2 H, when the return ore mosaic proportion is 80%, the vertical sintering speed and the sintering utilization coefficient are highest; the whole abrasion resistance index is in an increasing trend, and when the inlay proportion of the return ores is 40-100%, the abrasion resistance index is increased; as the inlay proportion of the return ores increases,<the sintered ore with the grain diameter of 10mm is reduced, the sintered ore with the grain diameters of 10-16 mm, 16-25 mm and 25-40 mm is increased, and the grain diameter distribution of the sintered ore is more reasonable.
The invention researches the positions of the return ores, and when the positions of the return ores are close to the lower part and the middle-lower part, the sintering speed and the utilization coefficient are superior to those of the upper part; when the return ore inlay position is close to the lower part, the strength of the sintering ore is slightly reduced, probably because the sintering speed is accelerated, the high temperature holding time is shortened, the strength is reduced, the sintering strength of the middle and lower part is higher than that of the lower part, and the upper, middle and lower parts of the wear-resistant index are equivalent to that of the lower part and obviously superior to other positions; on the whole, when return ores are inlaid at the lower part and the middle lower part of a sinter bed, the reducibility of the sinter is higher than that of the sinter only inlaid at the upper part; in conclusion, when the return ore embedding position is middle-down, the sintering yield, the sintering strength and the sintered ore metallurgical performance are all better.
Drawings
FIG. 1 is a graph showing vertical sintering rates for different return fine mosaic sizes;
FIG. 2 is a graph of the sintering utilization coefficients for different return fine mosaic grain sizes;
FIG. 3 shows the firing rates of different return fine mosaic particle sizes;
FIG. 4 is a graph showing drum strengths of different return fine mosaic grain sizes;
FIG. 5 is a graph of finished ore size distributions for different return fines tessellation sizes;
FIG. 6 shows the high-temperature softening properties of sintered ores of different return-ore inlaid grain sizes;
FIG. 7 shows the sinter droplet properties for different return fines inlay sizes;
FIG. 8 is a graph of sinter softening temperatures for different return fines inlay sizes;
FIG. 9 is a permeability index for different return fines inlaying proportions;
FIG. 10 is a graph showing the vertical sintering rates for different return fine mosaic ratios (0% to 50%);
FIG. 11 shows vertical sintering rates for different return fine mosaic ratios (20% to 80%);
FIG. 12 shows the sintering utilization coefficients for different return ore inlaying proportions (20% -80%);
FIG. 13 shows the firing rates for different return ore inlay ratios;
FIG. 14 is a graph of drum strength for different return fines inlay ratios;
FIG. 15 is an antiwear index for different return fines inlaying proportions;
FIG. 16 is a graph of finished ore size distributions for different return ore tessellation proportions;
FIG. 17 shows reduction tests of sintered ores at different agglomeration ratios;
FIG. 18 is a melt drip performance test for different return fines inlay proportions;
FIG. 19 is a softening performance test for different return fines load ratios;
FIG. 20 is a graph of vertical sintering rates for different return fines agglomeration locations;
FIG. 21 is a graph of the sintering utilization coefficients for different return mine inlay locations;
FIG. 22 shows the firing rates at different return-ore-inlaid locations;
FIG. 23 is a graph of drum strength for different return fines inlay locations;
FIG. 24 is an attrition index for different return mine inlay locations;
FIG. 25 is a graph of finished ore grain size distribution for different return fines agglomeration locations;
FIG. 26 is a reduction test of sintered ore at different return fines agglomeration locations;
fig. 27 shows the sinter softening temperatures at different return agglomerate inlaying locations.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention, the present invention will be further described in detail with reference to the following embodiments.
Example 1
The return fine mosaic sintering process of the embodiment comprises the following steps:
(1) The ore blending scheme of this example is shown in table 1, wherein the composition and components of the No. 28# ore powder of the mixed powder are shown in table 2 (all ore powders known in the art and commercially available), and the chemical components of the bedding material sintered ore are shown in table 3;
(2) Screening return ores: screening sintered ore with the granularity of less than 7mm as return fines, and screening the sintered ore into the return fines with the granularity of 0-3 mm and the return fines with the granularity of 3-7 mm;
(3) Firstly, mixing: putting the return ores with the granularity of 0-3 mm, the coke powder, the quicklime, the dolomite powder and the mixed powder into a mixer, uniformly mixing for 4min, and adding water accounting for 7% of the mass of the bedding materials;
(4) And (2) secondary mixing and granulating: adding the material obtained by mixing in the step (3) into a secondary mixing roller machine, uniformly mixing and granulating for 5min, and adding water accounting for 0.5-1% of the mass of the primary mixed material to obtain a secondary mixed sintering material; at the moment, the return ores with the granularity of 3-7 mm are uniformly mixed with the second mixed sintering material;
(5) Material distribution: loading the material obtained in the step (4) into a sintering trolley through a distributor, and controlling the thickness of a material layer to be 800mm;
(6) And (3) ignition: igniting the sintering trolley at 1150 ℃ for 1min, and controlling the ignition negative pressure to be 11kPa;
(7) And (3) sintering: after ignition is finished, adjusting the sintering negative pressure to 16kPa;
(8) Crushing and cooling;
(9) Screening: screening out sinter with the granularity smaller than 7mm from the cooled and crushed sinter as return fines; (10) sinter index detection: the results are shown in examples 1 to 3.
Table 1 mining scheme (% by mass)
TABLE 2 flour 28# composition and ingredients
TABLE 3 chemical composition of bedding sinter (% by mass)
Example 2
The return-ore inlaid sintering process of the present example is the same as that of example 1, except that the difference is only the ore blending scheme, which is shown in table 4, and the chemical composition of the bedding material sintered ore is shown in table 5.
Table 4 mining scheme (% by mass)
TABLE 5 chemical composition of bedding sintered ore (% by mass)
Example 3
The return-ore inlaid sintering process of the present embodiment is the same as that of example 1, except that the ore blending scheme is different, the ore blending scheme of the present embodiment is shown in table 6, and the chemical composition of the bedding material sintered ore is shown in table 7.
TABLE 6 mine allocation scheme (% by mass)
TABLE 7 chemical composition of hearth layer-spread sinter (% by mass)
EXAMPLE 1 Effect of different return fines inlay particle sizes on sintering Process index
Selecting the granularity of the return ores inlaid with the granularity of less than 1mm, 1-3 mm, 3-5 mm, 5-7 mm and more than 7mm for testing, controlling the inlaying proportion to be 100%, inlaying the return ores to the whole sinter bed, and adopting an on-site production scheme for the test:
1. influence of return ore mosaic particle size on sintering yield
As can be seen from fig. 1 and 2, as the return fine inlay particle size gradually increases, the vertical sintering speed and utilization factor show a tendency of increasing first and then decreasing, and as a whole, the vertical sintering speed and utilization factor of a particle size larger than 1mm is higher than that of a particle size smaller than 1mm, and when the inlay return fine particle size is 3 to 5mm, the vertical sintering speed and utilization factor are optimal. This is because when the return ores with suitable grain sizes are inlaid, the return ores can form a suitable gap structure with the sintering materials after the two-mixing granulation, so as to improve the vertical sintering speed, and when the grain sizes of the return ores inlaid are too large or too small, the difference between the grain sizes of the return ores inlaid and the grain sizes of the iron ore powder after the two-mixing granulation is large, so that effective gaps cannot be formed, so that the permeability of a sintering material layer is reduced, and further the sintering speed and the utilization coefficient are reduced.
As can be seen from fig. 3, as the return fine mosaic particle size gradually increases, there is no significant change in the firing of the sintered ore as a whole, indicating that the return fine mosaic particle size has no significant effect on the firing rate.
2. Influence of return-ore mosaic particle size on sintering strength
As can be seen from FIG. 4, the strength of the agglomerate with the inlaid grain size of the return ores larger than 1mm is higher than that of the return ores with the inlaid grain size of less than 1mm, wherein the strength of the agglomerate obtained by inlaying the return ores with the grain sizes of 1-3 and 3-5 mm is about 67%, while the strength of the agglomerate obtained by inlaying the return ores with the grain sizes of 5-7 and more than 7mm is not greatly different.
As can be seen from FIG. 5, compared with the inlaid particle size of the return ores of less than 1mm, after the return ores inlaid with large particle sizes, the sintered ores with particle sizes of less than 10mm are reduced, the sintered ores with particle sizes of 10-16 mm are increased, and the particle size distribution of the sintered ores is more uniform, wherein when the inlaid particle size of the return ores is 3-5 mm, the particle size distribution of the sintered ores is most uniform.
3. Influence of return ore inlay particle size on sinter metallurgy performance
As can be seen from fig. 6 to 8, the inlaying of the return ores of different grain sizes has no significant influence on the high-temperature softening performance and the molten drop performance of the sintered ore; after the return ores with different grain diameters are inlaid, the softening starting temperature of the finished sintered ore is 1098 +/-10 ℃, the softening interval is 100 +/-4 ℃, the melting starting temperature is 1210 +/-10 ℃ and the melting interval is about 240 ℃, and all high-temperature metallurgical properties are not obviously changed, which shows that the inlaid grain size of the return ores has no obvious influence on the metallurgical properties of the sintered ore.
In conclusion, if better sintering yield, sintering strength and metallurgical performance are to be obtained at the same time, the return fine mosaic granularity is 3-7 mm; furthermore, the return fine mosaic granularity is 3-5 mm.
EXAMPLE 2 Effect of different return-ore-inlaying proportions on sintering Process index
Selecting different return ore inlaying proportions for testing, controlling the return ore granularity to be 3-7 mm, inlaying the return ore to the whole sinter bed, and adopting an on-site production scheme for the test:
1. influence of the marbling ratio on the sintering process
As can be seen from fig. 9, as the inlay proportion increases, the air permeability of the entire material layer gradually becomes better, and particularly in the first half (750 seconds) of sintering, the higher the inlay proportion, the better the air permeability of the material layer; in the latter half section of sintering, the material layer after the return ores are inlaid is also better in air permeability than the sintering material layer without the return ores. This is because, the agglomerate layer inlay return fines can form suitable void structure at sintering process, improves the bed of material gas permeability, utilizes near the marginal effect of large granule return fines, when improving the gas permeability of the bed of material, and large granule return fines self can not the overfusion, and the final agglomerate layer can form better void structure, guarantees good sintering gas permeability and sintering effect.
As can be seen from fig. 10, as the mosaic ratio increases from 0% to 50%, the vertical sintering speed as a whole shows a tendency to increase, from about 22mm/min to 27mm/min, and the sintering speed is remarkably improved.
2. Influence of return ore inlaying proportion on sintering yield
As can be seen from FIGS. 11 and 12, as the return fine mosaic ratio increases from 20% to 80%, the vertical sintering rate and the sintering utilization factor increase in an upward manner, wherein the vertical sintering rate increases by about 4.5mm/min and the sintering utilization factor increases by about 0.5t/m 2 H, wherein the vertical sintering speed and the sintering utilization coefficient are highest when the return ore mosaic ratio is 80%.
As can be seen from fig. 13, the firing rate slightly decreased with an increase in the inlay ratio, which is probably because the firing rate slightly decreased with an increase in the return-ore inlay ratio, the bed permeability became better, the sintering rate increased, and the holding time was shortened, but the overall effect was not so great.
3. Influence of the marbling ratio on the sintering strength
As can be seen from fig. 14, as the inlay proportion of the return ores increases from 0% to 100%, the drum strength of the sintered ores slightly decreases (decreases by 3%), which indicates that the inlay of the return ores during the sintering process has a certain effect on the drum strength, but the overall effect is not great, and the drum strength is the best when 80% of the inlay proportion of the return ores has the smallest effect.
As can be seen from fig. 15, the anti-wear index increases as a whole, wherein the anti-wear index decreases when the return fine inlay proportion is 20%, and the anti-wear index increases when the return fine inlay proportion is 40% to 100%.
As can be seen from fig. 16, as the proportion of the return fines increases, the sintered ore with a particle size of <10mm decreases, and the sintered ore with particle sizes of 10 to 16mm, 16 to 25mm and 25 to 40mm increases, the particle size distribution of the sintered ore is more reasonable, and when the proportion of the return fines is 80%, the particle size distribution of the sintered ore is most reasonable.
4. Influence of return ore inlaying proportion on sinter metallurgy performance
As can be seen from FIG. 17, as the marbling ratio of the return ores increases from 0% to 100%, the reducing RI of the sintered ores slightly increases but remains substantially unchanged, about 66%, and the low-temperature reduction pulverization index RDI of the sintered ores +3.15 And RDI -0.5 The method has no obvious change, and is respectively maintained at about 69 percent and 8.6 percent, which shows that the return-ore inlaid sintering has no obvious influence on the high-temperature metallurgical performance of the finished sintered ore.
As can be seen from fig. 18 and 19, the softening property and the melt dripping property of the sintered ore remain substantially unchanged after the return ores of different proportions are inlaid. The softening starting temperature is maintained at about 1040 ℃, the softening interval is about 110 ℃, the melting starting temperature is about 1230 ℃, and the melting interval is about 175 ℃; the mosaic return ores have no great influence on the reflow performance of the sintering ores.
In conclusion, if better sintering yield and sintering strength are obtained at the same time, the return ore inlaying proportion is 40-100%; preferably, the return mine inlay proportion is 40 to 80 percent; further, the return ore retention ratio is 80%.
EXAMPLE 3 Effect of different return-ore-inlay proportions on sintering Process indices
The sintering material layer with the thickness of 800mm is evenly divided into an upper layer, a middle layer and a lower layer, return ores are inlaid into different layers, the inlaying proportion is controlled to be 100%, and the grain size of the return ores is controlled to be 3-7 mm.
1. Influence of return-ore inlay position on sintering yield
It can be seen from fig. 20 and 21 that when the return ore inlay position is close to the lower part and the middle-lower part, the sintering speed and utilization coefficient are superior to those of the upper part, the sintering speed is increased by 2mm/min, and the sintering utilization coefficient is increased by 0.1t/m2 · h on average; the location prioritization is: the lower part is larger than the lower part, the middle part is larger than the upper part, because the return ore embedding position is close to the lower part, the ventilation property of the lower part of the material layer is improved, and the influence of the overhumidity of the lower part of the material layer on the sintering effect during air draft sintering is reduced.
As can be seen from fig. 22, when the return ores are inlaid in the middle or middle-upper portion, the firing rate is slightly higher than that in the lower portion, but the firing rate does not change much as a whole.
2. Influence of return ore inlay position on sintering strength
As can be seen from fig. 23, when the return-ore inlaid position is close to the lower portion, the strength of the sintered ore is slightly reduced, which may be due to the fact that the sintering speed is increased and the high-temperature retention time is shortened, resulting in the reduction of the strength, and the position priority order is: the upper middle is larger than the middle lower; as can be seen from the abrasion resistance test of fig. 24, the positional priority of the abrasion resistance index is middle lower = lower > upper middle = upper middle.
As can be seen from fig. 25, when the return ore insertion position is the middle-upper position, less sintered ore with a grain size of <10mm is present, the particle size of the sintered ore is more uniform, and the middle-lower position is followed.
3. Influence of return ore inlaying position on sintered ore metallurgy performance
As can be seen from fig. 26, as a whole, the return ores are inlaid at the lower part of the sinter bed, and the reducibility of the sinter is higher than that of the sinter inlaid only at the upper part, wherein the reducibility is best at the positions of middle-lower part and lower part where the return ores are inlaid, because the return ores are inlaid at the lower part, the air permeability deterioration caused by the over-wet of the lower layer material due to the air draft at the lower part of the sinter bed can be relieved, and the method is beneficial to generating Fe by contacting air more easily during the sintering process of the ore powder 2 O 3 And the reducibility is improved.
As can be seen from fig. 27, after the return ores are inlaid in different positions, the softening performance and the melt dripping performance of the sintered ores are not significantly changed, and the softening starting temperature is maintained at about 1060 ℃, the softening range is about 98 ℃, the melting starting temperature is about 1230 ℃, and the melting range is about 180 ℃. This indicates that changing the position of the inlaid return fines has no significant effect on the reflow properties of the sinter.
In summary, to make the sintering yield, sintering strength and sintered ore metallurgical performance better, the return ore inlaid position is preferably the middle-down position, which is the best effect.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.
Claims (10)
1. A return fine mosaic sintering process comprises the following steps: preparing materials, primary mixing, secondary mixing and granulating, distributing materials, igniting, sintering, crushing and cooling, screening and detecting indexes of sinter ore; the method is characterized in that the bedding materials prepared in the ingredients comprise: 30 to 35 portions of return ores, 3.5 to 4.0 portions of coke powder, 5.5 to 7.0 portions of quicklime, 2.0 to 3.0 portions of dolomite powder and 51 to 53 portions of mixed powder; screening the return ores before the first mixing step, performing first mixing and second mixing granulation on the return ores with the granularity of 0-3 mm, the coke powder, the quick lime, the dolomite powder and the mixed powder to obtain second mixed sintering materials, then uniformly mixing the return ores with the granularity of 3-7 mm and the second mixed sintering materials, and performing subsequent processes.
2. The return fine inlaid sintering process according to claim 1, wherein the mixed powder comprises, in weight percent: 68% of fine powder, 19% of mineral powder, 11% of iron-containing recovery sundries and 2% of steel slag.
3. The return fine mosaic sintering process of claim 1, wherein said bedding material sinter mineral comprises the chemical components of: alkalinity R is (2.2-2.7), TFe (47.0-50.0)%, siO 2 (5.0～5.8)％，CaO(13～17)％，MgO(2.6～3.0)％，Al 2 O 3 (2.5～3.5)％，S(0.07～0.12)％，P(0.06～0.12)％，TiO 2 (4.0～5.8)％，V 2 O 5 (0.3～0.45)％。
4. The return fine mosaic sintering process of claim 1, wherein the return fine mosaic has a grain size of 3 to 5mm.
5. The return fine mosaic sintering process of claim 1, wherein the return fine mosaic ratio is 40% to 100%.
6. The return fine mosaic sintering process of claim 1 wherein said return fine mosaic location is a lower or intermediate lower layer of a sintered layer.
7. The return fine mosaic sintering process of claim 1 wherein the amount of water added during said primary mixing is 7% of the mass of said bedding material.
8. The return fine mosaic sintering process of claim 1, wherein the thickness of the sinter layer during sintering is 750-800 mm.
9. The return fine mosaic sintering process of claim 1, wherein in the ignition process, the ignition temperature is 1150 ℃, the ignition time is 1min, and the ignition negative pressure is 11kPa.
10. The return fine mosaic sintering process of claim 1 wherein the sintering suction during sintering is 16kPa.
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