CN114317949B - Reinforced sintering method for upper material layer - Google Patents
Reinforced sintering method for upper material layer Download PDFInfo
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- 238000005245 sintering Methods 0.000 title claims abstract description 119
- 239000000463 material Substances 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000000203 mixture Substances 0.000 claims abstract description 140
- 238000009826 distribution Methods 0.000 claims abstract description 16
- 239000000446 fuel Substances 0.000 claims description 34
- 239000012141 concentrate Substances 0.000 claims description 31
- 238000002156 mixing Methods 0.000 claims description 27
- 239000004744 fabric Substances 0.000 claims description 8
- 230000004907 flux Effects 0.000 claims description 7
- 239000002075 main ingredient Substances 0.000 claims description 4
- 239000004615 ingredient Substances 0.000 claims description 3
- 238000005453 pelletization Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 6
- 230000014759 maintenance of location Effects 0.000 abstract description 6
- 239000002245 particle Substances 0.000 abstract description 6
- 238000005338 heat storage Methods 0.000 abstract description 3
- 229910052742 iron Inorganic materials 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000008569 process Effects 0.000 description 7
- 238000005728 strengthening Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 230000000171 quenching effect Effects 0.000 description 5
- 238000005204 segregation Methods 0.000 description 5
- 230000003247 decreasing effect Effects 0.000 description 4
- 238000010791 quenching Methods 0.000 description 4
- 238000005507 spraying Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- WETINTNJFLGREW-UHFFFAOYSA-N calcium;iron;tetrahydrate Chemical compound O.O.O.O.[Ca].[Fe].[Fe] WETINTNJFLGREW-UHFFFAOYSA-N 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052595 hematite Inorganic materials 0.000 description 1
- 239000011019 hematite Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000012256 powdered iron Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000010405 reoxidation reaction Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000004449 solid propellant Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses an upper material layer reinforced sintering method, and belongs to the field of iron ore sintering in the metallurgical industry. The invention adopts different proportioning ratios for the secondary mixture and the tertiary mixture, and can obtain the mixture suitable for sintering production of the middle and lower layers and the upper layers, and then the mixture is assisted with the negative pressure adjustment of the draft suitable for sintering the upper material layer, thereby prolonging the retention time of the high temperature zone of the upper sintering layer, enabling the retention time to reach the level of the middle and lower layers, greatly reducing the sintering temperature difference of the upper, middle and lower layers, balancing the heat distribution in each layer, and further improving the sintering productivity and the quality of the sintered ore. The invention solves the problem of serious uneven heat distribution in the height direction of the material layer caused by the automatic heat storage effect of the suction sintering of the belt type sintering machine in the prior art, can effectively balance the heat distribution in the height direction of the sintering material layer, improve the self performance of upper particles, improve the yield of the upper material layer of the sintering mixture, and further improve the yield of the whole sintering ore.
Description
Technical Field
The invention relates to the technical field of iron ore sintering in the metallurgical industry, in particular to an upper material layer reinforced sintering method.
Background
The iron ore sintering process is to mix powdered iron ore, solid fuel (such as coke powder or coal powder) with flux, add water, pelletize, load into a sintering machine trolley through a distributor, sinter from top to bottom under the action of air draft after ignition, sinter into agglomerate under the condition of incomplete melting. With the development of sintering technology, the height of the material layer of the sintering machine is continuously increased, the automatic heat storage effect of the air draft sintering is more obvious, and the heat distribution in the height direction of the material layer is greatly different, so that the heat quantity of the upper layer is less, and the heat quantity of the lower layer is more. The upper layer sintered material is in a state of 'quenching and quenching, and the holding time of a high temperature zone is short', so that the yield and the drum strength of the sintered ore are lower; the high temperature area of the lower layer has long retention time and sufficient heat, and the sinter generates more liquid phase, which is favorable for the crystallization of calcium ferrite and the reoxidation crystallization of hematite, so that the drum strength and the yield of the sinter are higher than those of the upper layer.
Aiming at the problems, technical measures such as segregation distribution, fuel addition, fuel segregation, hot air sintering and the like are mainly adopted in the industry, but the technical measures have more defects. The segregation distribution method of the sintering mixture at home and abroad can be divided into: reflecting plates, round roller cloth, sieve cloth, air flow cloth and the like, but all have certain limitations, and the practical effect is not quite satisfactory. The fuel ratio in the integral sintering material is increased, and the heat condition of the upper material layer can be improved, but the heat of the middle and lower parts of the material layer is excessive, so that the fuel consumption is increased, and the quality of the middle and lower layer sintering ore is directly influenced. The fuel segregation and hot air sintering can only partially supplement part of heat required by the upper material layer, the retention time of the upper high temperature zone is still shorter than that of the middle lower layer, and the quality improvement effect on the upper layer of the sinter is limited.
Through searching, a great number of patents are published on the mixed sintering technology, such as application numbers 200920069322.6, 202020401340.6, 201710064781.4, 201921965306.5, 201910834349.8, 201921453860.5, 201910095844.1, 201420726062.6 and the like, realize layering distribution of the sintering mixture, so that a large particle size is firstly laid down, and a small particle size is laid on the upper surface, and although reasonable segregation of the particle sizes of the mixture and the fuel is ensured, the practical effect is not satisfactory. As another application number 202011527427.9 discloses a soaking sintering method based on layered composite heat supply, high-temperature gas, combustible gas and steam are sequentially sprayed to the material surface of the sintering mixture after ignition to supply heat for the sintering mixture of the middle upper layer, the middle layer and the lower layer respectively, so that the problem that the heat of the upper material layer is insufficient and the heat of the lower material layer is excessive in the traditional sintering process is solved, but the whole process is complex, three processes of high-temperature gas spraying, combustible gas spraying and steam spraying are involved, and additional heat sources and resources are needed. The injection of high temperature gas can alleviate the problem of "quenching by quenching" of the upper mixture, but has little effect on prolonging the retention time of the high temperature zone.
In addition, the application of application numbers 201610815437.X and 201720033178.5 realizes secondary distribution and ignition by adding a set of mixture distributor and igniter, improves the yield of the sintering ore, improves the quality of the sintering ore, reduces the sintering energy consumption and environmental pollution, but has the problems of low sintering yield, uneven quality of the sintering ore at the upper and lower parts of the material layer, and the like. The application 202010057280.5 discloses a double-layer sintering method and a sintering device, and adds microwave heating and heat preservation for an upper layer mixture on the basis of secondary material distribution and ignition, so that the whole set of production process is more complex. And the adverse effect of quenching effect caused by the moisture of the overwet layer in the second cloth layer passing through the sintered layer in the first cloth layer under the action of air draft is not changed.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention aims to solve the problem of serious uneven heat distribution in the height direction of a material layer caused by the automatic heat storage effect of the exhaust sintering of a belt sintering machine in the prior art, and aims to provide an upper material layer reinforced sintering method which can effectively balance the heat distribution in the height direction of a sintered material layer, improve the self performance of upper particles, improve the yield of the upper material layer of a sintering mixture and further improve the yield of an integral sintered ore.
2. Technical proposal
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
the invention relates to an upper material layer reinforced sintering method, which comprises the following steps:
s1, mixing main ingredients: mixing evenly mixed ore, flux, fuel, miscellaneous materials, blast furnace return ore and internal return ore, and carrying out primary uniform mixing and secondary pelletization mixing on the mixed materials to obtain a sintered secondary mixture;
s2, mixing auxiliary ingredients: proportioning the magnetic concentrate, the flux and the fuel, and uniformly mixing the prepared materials to obtain a primary mixture of a sintered upper layer;
s3, mixing for three times: adding the primary mixture of the upper sintering layer into the secondary mixture of the partial sintering to perform three-time mixing to obtain a tertiary mixture of the sintering;
s4, primary cloth: paving a bedding material on the sintering trolley, and paving a sintering secondary mixture on the bedding material;
s5, secondary material distribution and ignition: and paving a sintered tertiary mixture on the secondary mixture layer, and then performing ignition sintering.
Further, the height of the sintered secondary mixture layer is 50-75% of the total sintered layer thickness, and the height of the sintered tertiary mixture layer is 25-50% of the total sintered layer thickness.
Further, the fuel content in the sintered secondary mixture is 0.1 to 0.6%, preferably 0.1 to 0.2% lower than that in the sintered integral mixture; the fuel content in the mixture sintered for three times is 0.2 to 0.6 percent higher than that in the mixture sintered for the whole, preferably 0.2 to 0.3 percent;
and/or
The alkalinity of the sintered secondary mixture is 0.1-0.4, preferably 0.1-0.2, lower than that of the sintered integral mixture; the alkalinity of the mixture sintered for three times is 0.2 to 0.6, preferably 0.2 to 0.4 higher than that of the mixture sintered integrally;
and/or
The proportion of the magnetic concentrate in the sintered secondary mixture is 1-10% lower than that of the sintered integral magnetic concentrate, and is preferably 1-4.3%; the proportion of the mixture concentrate of the three times of sintering is 1.5-20 percent, preferably 1.5-10 percent, of the proportion of the mixture concentrate of the whole sintering mixture.
Further, in the range of 25-40% of the front of the sintering machine in the length direction, the opening of the air door is gradually increased along the advancing direction of the trolley, and the negative suction pressure is adjusted to gradually decrease to the sintering negative pressure, wherein the decreasing amplitude is 1-8 kPa, and preferably 4-6 kPa.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
(1) According to the reinforced sintering method for the upper material layer, aiming at the problem of serious uneven heat distribution in the height direction of the material layer caused by automatic heat accumulation in the exhaust sintering of the existing belt type sintering machine, the secondary sintering mixture and the tertiary sintering mixture are respectively prepared into mixtures suitable for sintering middle and lower layers and upper layer sintering production, and the exhaust negative pressure suitable for sintering the upper material layer is used for adjusting, so that the retention time of a high-temperature zone of the upper sintering layer is prolonged, the middle and lower layer level is reached, the sintering temperature difference of the upper, middle and lower layers is greatly reduced, the heat distribution in each layer is balanced, the self performance of upper layer particles is improved, and the sintering productivity and the quality of sintered ore are further improved.
Drawings
FIG. 1 is a schematic flow chart of the method for strengthening sintering of an upper material layer.
Detailed Description
For a further understanding of the present invention, the present invention will be described in detail with reference to the drawings.
The invention is further described below with reference to examples.
Example 1
The method for strengthening and sintering the upper material layer in the embodiment comprises the following steps:
s1, mixing main ingredients: mixing evenly mixed ore, flux, fuel, miscellaneous materials, blast furnace return ore and internal return ore, and carrying out primary uniform mixing and secondary pelletization mixing on the mixed materials to obtain a sintered secondary mixture; the main ingredient mixing process can be specifically determined according to practical requirements, is a conventional technology well known in the industry and is not repeated;
s2, mixing auxiliary ingredients: proportioning the magnetic concentrate, the flux and the fuel, and uniformly mixing the prepared materials to obtain a primary mixture of a sintered upper layer; the auxiliary material mixing process is specifically determined according to practical requirements, is a conventional technology known in the industry and is not repeated;
s3, mixing for three times: adding the primary mixture of the upper sintering layer into the secondary mixture of the partial sintering to perform three-time mixing to obtain a tertiary mixture of the sintering; similarly, the mixing process is a conventional technology in industry specifically determined according to practical requirements, and is not repeated;
s4, primary cloth: paving a bedding material on the sintering trolley, and paving a sintering secondary mixture on the bedding material;
s5, secondary material distribution and ignition: and paving a sintered tertiary mixture on the secondary mixture layer, and then performing ignition sintering.
In this embodiment, the height of the sintered secondary mixture layer is two thirds of the total sintered layer thickness, and the height of the sintered tertiary mixture layer is one third of the total sintered layer thickness.
Secondly, the enhanced sintering method can further realize the improvement of the sintering performance quality by the following control means:
1. the fuel content in the sintered secondary mixture is 0.1-0.6% lower than the fuel content in the sintered integral mixture, and in the specific embodiment is 0.1%; the fuel content in the mixture sintered for three times is 0.2 to 0.6 percent higher than that in the mixture sintered for the whole, and in the embodiment, the fuel content is 0.2 percent;
2. the alkalinity of the sintered secondary mixture is 0.1-0.4 lower than that of the sintered integral mixture, such as 0.1 in the specific embodiment; the alkalinity of the mixture sintered for three times is 0.2 to 0.6 higher than that of the mixture sintered integrally, such as 0.2 in the specific embodiment;
3. the proportion of the magnetic concentrate in the sintered secondary mixture is 1-10% lower than that of the sintered integral magnetic concentrate, such as 10% in the specific embodiment; the proportion of the mixture concentrate of the three times of sintering is 1.5-20% higher than that of the mixture concentrate of the whole sintering mixture, such as 20% in the specific embodiment.
4. In the range of 25-40% of the sintering machine in the length direction, gradually increasing the opening of the air door along the advancing direction of the trolley, adjusting the negative suction pressure to gradually reduce to the sintering negative pressure, wherein the reduction range is 1-8 kPa, and in the specific embodiment, the reduction range is 1kPa in the range of the first third of the sintering machine in the length direction.
It should be noted that, in the present enhanced sintering method, the above-mentioned control means 1-4 may be implemented individually, in any combination or all, and may be adjusted and set according to actual effect requirements, which will not be described here. The sintering method firstly proposes the concept of improving the overall sinter yield and reducing sintering powder return by improving the performance of the upper sinter, and realizes the reinforced sintering effect of sintering the upper material layer by the thick material layer.
Example 2
The method for strengthening and sintering the upper material layer in this embodiment is basically the same as that in embodiment 1, except that the height of the sintered secondary mixture layer in this embodiment is 75% of the total sintered layer thickness, and the height of the sintered tertiary mixture layer is 25% of the total sintered layer thickness. More specifically, in this embodiment, only the front third of the sintering machine in the length direction is controlled, the opening of the air door is gradually increased along the forward direction of the trolley, the negative pressure of the air suction is adjusted to gradually decrease to the sintering negative pressure, specifically, two sections of pressure adjustment are adopted, the negative pressure adjustment scheme is shown in table 1 below, and the sintering effect is shown in table 2 below after implementation:
TABLE 1 sintering exhaust negative pressure adjustment scheme
TABLE 2 sintering of layers technique and quality index
Example 3
The method for strengthening and sintering the upper material layer in this embodiment is basically the same as that in embodiment 1, except that the height of the sintered secondary mixture layer in this embodiment is 50% of the total sintered layer thickness, and the height of the sintered tertiary mixture layer is 50% of the total sintered layer thickness. Still more particularly, the present embodiment controls the fuel content in the sintered secondary mix to be 0.6% lower than the fuel content in the sintered monolith mix; the fuel content in the mixture sintered for three times is 0.6% higher than that in the mixture sintered for the whole; or: the alkalinity of the sintered secondary mixture is 0.3 lower than that of the sintered integral mixture; the alkalinity of the mixture sintered for three times is 0.3 higher than that of the mixture sintered integrally; or: the proportion of the magnetic concentrate in the sintered secondary mixture is 1.5 percent lower than that of the sintered integral magnetic concentrate; the proportion ratio of the mixture concentrate of the sintered tertiary mixture to the proportion ratio of the mixture concentrate of the sintered integral mixture is 1.5 percent; or: the control method is controlled in the range of 25% before the length direction of the sintering machine, the opening of the air door is gradually increased along the advancing direction of the trolley, the negative pressure of the air suction is adjusted to gradually decrease to the sintering negative pressure, the decreasing amplitude is 8kPa, and the control scheme can be singly or arbitrarily combined for application.
Example 4
The method for strengthening and sintering the upper material layer in this embodiment is basically the same as that in embodiment 1, except that the height of the sintered secondary mixture layer in this embodiment is 60% of the total sintered layer thickness, and the height of the sintered tertiary mixture layer is 40% of the total sintered layer thickness. Still more particularly, the present embodiment controls the fuel content in the sintered secondary mix to be 0.2% lower than the fuel content in the sintered monolith mix; the fuel content in the mixture sintered for three times is 0.3% higher than that in the mixture sintered for the whole; or: the alkalinity of the sintered secondary mixture is 0.4 lower than that of the sintered integral mixture; the alkalinity of the mixture sintered for three times is 0.6 higher than that of the mixture sintered integrally; or: the proportion of the magnetic concentrate in the sintered secondary mixture is 1% lower than that of the sintered integral magnetic concentrate; the proportion ratio of the mixture concentrate of the sintered tertiary mixture to the proportion ratio of the mixture concentrate of the sintered integral mixture is 1.5 percent; or: the control method is controlled in the range of 40% before the length direction of the sintering machine, the opening of the air door is gradually increased along the advancing direction of the trolley, the negative pressure of the air suction is adjusted to gradually decrease to the sintering negative pressure, the decreasing amplitude is 6kPa, and the control scheme can be singly or arbitrarily combined for application.
Example 5
The method for strengthening and sintering the upper material layer is basically the same as in the embodiment 1, except that the fuel content in the sintered secondary mixture is controlled to be lower than that in the sintered integral mixture by 0.13%; the fuel content in the mixture sintered for three times is 0.3% higher than that in the mixture sintered for the whole; or: the alkalinity of the sintered secondary mixture is 0.2 lower than that of the sintered integral mixture; the alkalinity of the mixture sintered for three times is 0.4 higher than that of the mixture sintered integrally; or: the proportion of the magnetic concentrate in the sintered secondary mixture is 4.3 percent lower than that of the sintered integral magnetic concentrate; the proportion of the mixture concentrate of the sintered tertiary mixture is 10 percent higher than that of the mixture concentrate of the sintered integral mixture; or: the control method is controlled within the range of 30% before the length direction of the sintering machine, the opening of the air door is gradually increased along the advancing direction of the trolley, the negative pressure of the air suction is adjusted to gradually decrease to the sintering negative pressure, the decreasing amplitude is 4kPa, and the control scheme can be singly or arbitrarily combined for application.
The invention and its embodiments have been described above by way of illustration and not limitation, and the invention is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present invention.
Claims (5)
1. An upper material layer reinforced sintering method is characterized in that: the method comprises the following steps:
s1, mixing main ingredients: mixing evenly mixed ore, flux, fuel, miscellaneous materials, blast furnace return ore and internal return ore, and carrying out primary uniform mixing and secondary pelletization mixing on the mixed materials to obtain a sintered secondary mixture;
s2, mixing auxiliary ingredients: proportioning the magnetic concentrate, the flux and the fuel, and uniformly mixing the prepared materials to obtain a primary mixture of a sintered upper layer;
s3, mixing for three times: adding the primary mixture of the upper sintering layer into the secondary mixture of the partial sintering to perform three-time mixing to obtain a tertiary mixture of the sintering;
s4, primary cloth: paving a bedding material on the sintering trolley, and paving a sintering secondary mixture on the bedding material;
s5, secondary material distribution and ignition: paving a sintered tertiary mixture on the secondary mixture layer, and then performing ignition sintering; the height of the sintered secondary mixture layer is 50-75% of the total sintered layer thickness, and the height of the sintered tertiary mixture layer is 25-50% of the total sintered layer thickness;
the fuel content in the sintered secondary mixture is 0.1-0.6% lower than the fuel content in the sintered integral mixture, and the fuel content in the sintered tertiary mixture is 0.2-0.6% higher than the fuel content in the sintered integral mixture;
and/or
The alkalinity of the sintered secondary mixture is 0.1-0.4 lower than that of the sintered integral mixture; the alkalinity of the mixture sintered for three times is 0.2 to 0.6 higher than that of the mixture sintered integrally;
and/or
The proportion of the magnetic concentrate in the sintered secondary mixture is 1-10% lower than that of the sintered integral magnetic concentrate; the proportion ratio of the mixture concentrate of the three times of sintering is 1.5-20% than that of the mixture concentrate of the whole sintering mixture;
in the range of 25-40% of the front of the sintering machine in the length direction, gradually increasing the opening of the air door along the advancing direction of the trolley, adjusting the negative suction pressure to gradually reduce to the sintering negative pressure, and reducing the negative suction pressure by 1-8 kPa.
2. The method for enhanced sintering of an upper material layer according to claim 1, wherein: the fuel content in the sintered secondary mixture is 0.1-0.2% lower than the fuel content in the sintered integral mixture, and the fuel content in the sintered tertiary mixture is 0.2-0.3% higher than the fuel content in the sintered integral mixture.
3. The method for enhanced sintering of an upper material layer according to claim 1, wherein: the alkalinity of the sintered secondary mixture is 0.1-0.2 lower than that of the sintered integral mixture; the alkalinity of the mixture sintered for three times is 0.2-0.4 higher than that of the mixture sintered integrally.
4. The method for enhanced sintering of an upper material layer according to claim 1, wherein: the proportion of the magnetic concentrate in the sintered secondary mixture is 1-4.3% lower than that of the sintered integral magnetic concentrate; the proportion of the mixture concentrate of the three times of sintering is 1.5-10% higher than that of the mixture concentrate of the whole sintering mixture.
5. The method for enhanced sintering of an upper material layer according to claim 1, wherein: in the range of 25-40% of the front of the sintering machine in the length direction, gradually increasing the opening of the air door along the advancing direction of the trolley, adjusting the negative suction pressure to gradually reduce to the sintering negative pressure, and reducing the negative suction pressure by 4-6 kPa.
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| CN110819792A (en) * | 2019-10-28 | 2020-02-21 | 鞍钢股份有限公司 | Method for producing pre-reduced sinter |
| CN113801991A (en) * | 2020-06-16 | 2021-12-17 | 上海梅山钢铁股份有限公司 | Method for improving quality of sinter |
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