Classifications

• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
  • C22B1/00—Preliminary treatment of ores or scrap
  • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
  • C22B1/16—Sintering; Agglomerating
  • C22B1/20—Sintering; Agglomerating in sintering machines with movable grates
  • C22B1/205—Sintering; Agglomerating in sintering machines with movable grates regulation of the sintering process
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
  • C22B1/00—Preliminary treatment of ores or scrap
  • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
  • C22B1/16—Sintering; Agglomerating
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
  • C22B1/00—Preliminary treatment of ores or scrap
  • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
  • C22B1/24—Binding; Briquetting ; Granulating
  • C22B1/2413—Binding; Briquetting ; Granulating enduration of pellets
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
  • Y02P10/00—Technologies related to metal processing
  • Y02P10/20—Recycling

Definitions

• the present invention relates to a method for producing sintered ore used as a main raw material for blast furnaces and the like.
• Sinter ore the main raw material for blast furnaces, is generally manufactured as follows. First, raw material ore (fine iron ore) is blended with carbonaceous materials such as lime powder and other CaO-containing secondary materials, quartzite and serpentine and other Si 0 2 containing raw materials and coatus powder. Add the appropriate amount of water, mix and granulate. This granulated compounded raw material (sintered raw material) is filled to a predetermined thickness on the pallet of a Dwytroid-type sintering machine, and after igniting the carbonaceous material on the surface of this packed bed, air is directed downward. While sucking, the charcoal inside the filled bed is combusted, and the blended raw material is sintered by the combustion heat to form a sintered cake. The sintered cake is then sized to obtain a product sintered ore having a particle size of several mm or more.
• carbonaceous materials such as lime powder and other CaO-containing secondary materials, quartzite and serpentine and other Si 0 2 containing raw materials and
• High quality sintered ore is required for stable blast furnace operation.
• the quality of sintered ore is indicated by cold strength, reduced powder index (RDI), and reducibility (RI). It has a great influence on the stability of the state of falling in the furnace, air permeability and liquid permeability in the furnace, ore reduction efficiency, and high temperature properties. For this reason, strict quality control is performed in the manufacturing process of sintered ore.
• it is required to improve the yield of sintered ore products, and to improve the efficiency and productivity of the sintered ore production line.
• iron ore which is a raw material for sintered ore, relies on 100% imports from overseas. In recent years, iron ore imports accounted for about 60% of Australian ore, about 20 to 25% of South American ore, and about 10 to 15% of Indian ore.
• FIG. 7 shows enlarged structure photographs of hematite ore, limonite ore, and maramamba ore.
• Indian ore although gangue content such as S i 0 2 is higher than that of South American ore, high-quality hematite ore and hematite ore containing about 4 to 5 mass% of crystal water are representative ores. It is one of the important iron ore resources. However, compared to South America and Australia, reserves are less, and mining and transportation to the port are delayed.In addition, infrastructure development for unloading is delayed, and shipments are restricted due to monsoons. , Etc., and the import ratio is struggling to grow.
• the marampa ore is a generic name for iron ore produced from the maramanpa deposit in Australia. Generally, it is a goethite (F e 2 0 3 'H 2 0) and marte (Fe 2 with a magnetite structure). 0 3 ) as the main mineral and the water content of crystallization compared to hematite ore
• LO I. Is according to JISM 8850.
• West Angelus or MAC ore is a typical iron ore.
• a typical example of limonite ore is pisolite ore. This pisolite ore generally has an internal structure in which the gap between fish egg-shaped hematite (Fe 2 0 3 ) is filled with goethite (Fe 2 0 3 'H 2 0), and is even further than marampa ore. It is an ore with a high crystal water content.
• low ore and ordi kudina ore are typical iron ores.
• it is also expected to use a brand called LC ID which has a higher crystal water content than the Jandi Kujina ore.
• limonite ore among Australian ores usually has a crystallization water content of about 9 to 1 l mass%, and there are few fines and the particle size is coarse. As you can see, there are many coarse pores in the mineral structure. For this reason, when the limonite ore is fired, the crystal water in the ore escapes and becomes more porous, resulting in a crack. In addition, if a CaO-based melt enters the relatively coarse pores from which crystal water has escaped during the sintering process, it will rapidly assimilate and cause excessive melting.
• maramanpa ore which was newly developed as an Australian ore and is expected to increase in use in the future, generally has a crystal water content of about 4 to 6 mass%, and it has fewer rough air holes than limonite ore. Since there is little crystallization water, excessive melting during firing is alleviated. However, because there are fine pores in the entire structure, it is easy to absorb the melt, and the absorbed melt assimilates the ore from the periphery, and when the Fe concentration in the melt increases, the viscosity increases rapidly, Firing is completed with pores left inside.
• the melt does not spread sufficiently to the adjacent ore, and the marampa ore portion becomes a sintered ore with fine pores remaining, so the strength decreases and the yield also decreases.
• Maramanpa ore has a fine particle size, when used in large quantities, the particle size after raw material granulation does not increase in the raw material processing step of sintering, and the bed of the bed charged on the sintering machine pallet does not increase. Air permeability will deteriorate and productivity will decrease.
• the present invention provides a method for producing a sintered ore that can produce a high-quality sintered ore at a low cost with a high production rate and yield under the circumstances of supplying raw iron ore as described above. With the goal.
• the inventors of the present invention have studied the optimum blending conditions for solving the above-mentioned problems on the premise that the above-mentioned plural types of iron ores are blended simultaneously in the sintering raw material.
• hematite ore, magnetite ore, limonite ore and maramampa ore were mixed at a mixing ratio considering the influence and interaction of their properties on the sintering process, and the total raw ore It has been found that high-quality sintered ore can be produced at low cost with high productivity and yield by blending at a blending ratio such that the average crystallization water content and particle size are at predetermined levels.
• the present invention has been made on the basis of the above findings, and the gist thereof is as follows.
• the raw ores to be blended are iron ore A having a crystallization water content of 9.0 mass% or more, iron ore B having a crystallization water content of less than 4. O mass%, and a crystallization water content of 4 A sintering raw material composed of iron ore C with O mass% or more and less than 9.0 mass%,
• the blending ratio of iron ore A, iron ore B and iron ore C is shown in Fig. 1.
• Point a iron ore A: 4 O mass%, iron ore B: 5 O mass%, iron ore C: 1 O mass%), point (iron ore A: 7 mass%, iron ore B: 5 O mass% :, iron ore C: 43 mass%), point c (iron ore A: 1 2 mass%, iron ore B: 1 8 mass% :, iron ore C: 7 O mass%), point d (iron ore A: 23 mass%, iron ore B: 7 mass%:, iron ore C: 7 O mass%) e (Ore A: 4 O mass%, Iron Ore B: 36 mass%:, Iron Ore C: 24 mass%) A method for producing sintered ore.
• point i iron ore A: 3 Omass%, iron ore B: 2 Omass% :, iron ore C: 5 Omass%) and It is characterized by producing sintered ore from a sintering raw material within the range surrounded by point e (iron ore A: 4 Omass%, iron ore B: 36 mass% :, iron ore C: 24 mass%) A method for producing sintered ore.
• Point b Iron Ore A: 7 mass%, Iron Ore B: o Omass% :, Iron Ore C: 43 mass%)
• Point h Iron Ore A: 1 1 mass%, Iron Ore ⁇ ] ⁇ >: 2 Omass%:, iron ore C 69 mass% ;, point i (iron ore A: 3 Omass%, iron ore ⁇ : 20 mass%: iron ore c 50 mass%), point e (iron ore A: 4 Omass% , Iron ore D: 36 mass%:, iron ore 24 mass%), point ⁇ (iron ore A: 4 Omass%, iron ore ⁇ : 4 Omass%, 20 mass%) and g (iron ore A: 3 Omass%, iron ore B: 5 Omass%, iron ore C: 2 Omass%).
• a method for producing a sintered ore characterized in that is produced.
• FIG. 1 is a drawing showing the range of iron ore A, B, and C content specified by Tomoaki.
• FIG. 2 is a drawing showing a more limited range of the mixing ratio of iron ores A, B, and C specified by the present invention.
• FIG. 3 is a drawing showing a more preferable range of the mixing ratio of iron ores A, B, and C when the mixing range of FIG. 1 is used as a pace.
• FIG. 4 is a drawing showing a more preferable range of the mixing ratio of iron ores A, B, and C when the mixing range of FIG. 1 is used as a base.
• FIG. 5 is a drawing showing a more preferable range of the mixing ratio of iron ores A, B and C when the mixing range of FIG. 2 is used as a base.
• FIG. 6 is a drawing showing a more preferable range of the mixing ratio of iron ores A, B, and C when the mixing range of FIG. 2 is used as a base.
• Figure 7 shows micrographs of the microstructures of hematite ore, limonite ore and maramampa ore.
• Fig. 8 is a graph showing the relationship between the amount of quicklime added to the sintered raw material and the production rate of the sintered ore.
• FIG. 9 is a graph showing the relationship between the ratio of fine ore having a particle size of 0.25 mm or less in the raw ore mixed with the sintered raw material and the production rate of the sintered ore.
• FIG. 10 is a drawing showing the mixing ratio of iron ores A, B, and C in each example.
• the crystal water content (LO I. The same shall apply hereinafter) and grain size of the raw ore to be mixed with the sintering raw material are important factors.
• Matite ore, magnetite ore and maramamba ore can be distinguished by the content of crystal water as follows.
• the normal particle sizes of these iron ores are the weight average diameter of limonite ore of 3. Omm or more, hematite or magnetite ore of 2.2 mm or more, and marampapa ore of 1.9 mm or less.
• the raw ore in the sintering raw material is composed of the above three types of iron ores A, B, and C.
• Iron Ore A 4 Omass%, Iron Ore B: 5 Omass%, Iron Ore C: 1 Omass%)
• Point b Iron Ore A: 7 mass%, Iron Ore B: 50 mass% :, Iron Ore C: 43 mass%
• Point c Iron ore A: 12 mass%, iron ore B: 18 mass% :, iron ore C: 7 Omass%)
• point d iron ore A: 23 mass%, iron ore B: 7 mass%: , Iron ore C: 70 mass%)
• point e iron ore A: 40 mass%, iron ore B: 36 mass% :, iron ore C: 24 mass%).
• the raw material ore refers to iron ore as a new raw material, and so-called return ore is not included in the definition of raw material ore.
• the limit line i in Fig. 1 defines the amount of iron ore B (hematite ore 'magnetite ore) combined, and the iron ore exceeds the limit line i (5 Omass% of all raw ores).
• Compounding B increases the production cost of the sintered ore, which is contrary to the object of the present invention.
• increasing the blending ratio of expensive iron ore B, which is high in quality compared to other ores, and that tends to wither, itself increases the manufacturing cost and supplies iron ore from the current production area.
• the limit line opening in Fig. 1 regulates the mixing limit of iron ore A (limonite ore).
• iron ore A When iron ore A is mixed beyond the limit line opening (4 O mass% of all raw ores), iron ore A large amount of rock-like melt is generated by A, and the air permeability of the sintered bed is greatly hindered. As a result, the quality and productivity of the sintered ore are reduced.
• iron ore A In order to prevent iron ore A from creating a rock-like melt that impedes aeration in the sintered bed, iron ore A must be distributed and charged on the sintered bed. It is.
• pseudo particles mainly composed of iron ore (iron ore B and Z or iron ore C) around the pseudo particles mainly composed of iron ore A in the raw material packed bed.
• the pseudo-particles mainly composed of stone A In order for the pseudo-particles mainly composed of stone A to be appropriately surrounded by other pseudo-particles mainly composed of iron ore, etc. Is considered to be 1.5 or more. If the ratio of iron ore A is 4 O mass% or less, the ratio of the pseudo particles is satisfied. In addition, it is more preferable that the number of pseudo-particles mainly composed of iron ore is about 3 to 4 while the number of pseudo-particles mainly composed of iron ore A is 1.
• the ratio of the raw material ore in the sintering raw material is preferably about 60 to 8 O mass%. Therefore, if the ratio of iron ore A is 4 O mass% or less, the ratio of iron ore A in the sintering raw material is about 24 to 3 2 mass% or less, and the above-mentioned pseudo particle ratio is satisfied. Will be.
• the limit line C in Fig. 1 defines the mixing limit of iron ore C (maramanpa ore) with a large amount of fine ore, and the iron ore C exceeds the limit line c (7 O mass% of all raw ores).
• the limit line c 7. O mass% of all raw ores.
• the amount of pine binder added is adjusted according to the content of fine ore with a particle size of 0 ⁇ 25 mm or less in the raw ore.
• the effect of is proportional to the amount of addition in the region where the amount of addition is small, but when the amount of addition increases beyond a certain level (about 2.5 mass% or more), the effect becomes saturated. Therefore, the proportion of iron ore C with a large amount of fine ore PT / JP2005 / 017436
• the 10 also has a limit, and as described below, the limit is about 7 O mass% specified by the limit line C.
• the proportion of fine ores with a particle size of 0.25 mm or less is about 4 O mass% for iron ore C, about 5 to 12 mass% for iron ore A, and about 20 to 3 for iron ore B. Although it is about 0 mass%, as shown in Fig. 9, if the proportion of fine-grained ore with a particle size of 0.25 mm or less in the raw ore exceeds about 35 mass%, it will adversely affect the sintering and produce The rate starts to drop. If the proportion of iron ore C is 70 mass% or less, the proportion of fine-grained ores with a particle size of 0.25 mm or less is about 25 to 30 mass% or less, and the effect on productivity is small.
• the limit line 2 in Fig. 1 defines the limit (upper limit) of the average crystal water content of the raw ore (iron ore A + B + C).
• the crystallization water content of the raw ore is high, the crystallization water is eliminated and a sintered structure with many pores is formed. Under the condition of a constant firing rate, the strength and yield of the sinter are reduced. On the other hand, if the firing rate is reduced to secure the firing time, the productivity is lowered.
• the amount of carbon is increased to increase the amount of heat, excessive melting occurs, resulting in deterioration or non-uniform air permeability and a decrease in yield.
• the average crystal water content of the raw ore (iron ore A + B + C) needs to be adjusted to 6. O mass% or less for such problems.
• the mixing ratio of iron ores A, B and C should be defined by two limit lines, that is, iron ore A should not exceed two limit lines. If blended and iron ores B and C are blended so as not to fall below the limit line 2, the average crystallization water content of the entire raw ore (iron ore A + B + C) should be adjusted to 6.0 mass% or less. Can do.
• the limit line E in Fig. 1 defines the limit (lower limit) of the average grain size of the raw ore (iron ore A + B + C). If the particle size of the raw ore is too small, the air permeability in the sintered bed will deteriorate and the yield of the sintered ore will decrease. It was found that the average particle size of the raw ore (iron ore A + B + C) needs to be adjusted to 2.2 mm or more for such problems. Based on the average particle size of iron ores A, B, and C, the blending ratio of iron ores A, B, and C should be specified by the limit line E.
• iron ore A should be blended so as not to fall below the limit line E If the iron ores B and C are blended so as not to exceed the limit line E, the average particle diameter of the entire raw ore (iron ore A + B + C) can be made 2.2 mm or more.
• the mixing ratio of iron ores A, B, and C in the raw ore is shown in FIG. It is defined as the range demarcated by the limit line -1, 1, 1, 1, i.
• the blending ratio of the iron ores A, B, and C in the raw ore is shown in FIG. 2 as point b (iron ore A: 7 mass%, iron ore B: 50 mass%). :, Iron ore C: 43 mass%), point c (iron ore A: 1 2 mass%, iron meteorite B: 1 8 mass% :, iron ore C: 7 Omass%), point d (iron ore A: 23 mass%) , Iron ore B: 7 mass% :, iron.
• Ore C 70 mass%), point e (iron ore A: 4 Omass%, iron ore B: 36 mass% :, iron ore C: 24 mass%), point (iron ore Stone A: 4 Omass%, Iron Ore B: 4 Omass%, Iron Ore C: 2 Omass%) and g (Iron Ore A: 3 Omass%, Iron Ore B: 5 Omass%, Iron Ore C: 2 Omass%).
• the limit line i, mouth, c, n, and e in Fig. 2 are specified is as described above. Furthermore, the limit line defines the lower limit of the amount of iron ore C (maramanpa ore), so by adding iron ore C so that it does not fall below this limit line, the amount of fine ore is cheap but low. Therefore, it is possible to produce high-quality sintered ore at a lower cost and at a higher production rate while actively blending iron ore C (maramanpa ore), which is likely to cause the above-mentioned problems.
• the mixing ratio of iron ores A, B, and C in the raw ore is within the range partitioned by one mouth and one by one haho into the limit line i in FIG. 2, that is, the points b and c described above.
• Point d, point e, point ⁇ and point g are preferable.
• Iron Ore B 2 Omass% :, Iron Ore C: 69 mass%)
• Point i Iron Ore A: 3 Omass%, Iron Ore B: 20 mass% :, Iron Ore C: 5 Omass%)
• Point e Iron Ore Stone A: 4 Omass%, Iron Ore B: 36 mass% :, Iron Ore C: 24mass%)
• ⁇ Iron Ore ⁇ : 4 Omass%, Iron Ore B: 4 Omass%, Iron Ore C: 2 Omass%
• g point iron ore A: 3 Omass%, iron ore B: 5 Omass%, iron ore C: 2 Omass%).
• the limit lines in Fig. 3 and Fig. 5 define more preferable blending conditions from the viewpoint of the strength of the sintered ore.
• the range surrounded by the point h, point c, point d, and point i, which deviates from the preferred range defined by the limit line, has been conventionally used as a sintering raw material.
• the ratio of iron ore B, which produces a dense sintered structure with little or less, is less than 20 mass%.
• the composition of iron ores A and C in which the sintered structure tends to become porous due to the release of crystal water by firing, Since the ratio will exceed 8 Omass%, it is difficult to maintain the strength of the sinter (and thus maintain the production rate and yield).
• the mixing ratio of iron ores A, B, and C is within the range defined by the limit line i.e. It is preferable to be within the range surrounded by point a, point b, point h, point i and point e. Also, when based on the blending range of Fig. 2, iron ore A, B, C The blending ratio of Fig. 5 is within the range defined by the limit line E ⁇ Lone-Toho in Fig. 5, that is, within the range surrounded by point b, point h, point e, point ⁇ and point g described above. It is preferable that
• the mixing ratio within the range further limited by the limit line h is preferable as shown in FIGS. 4 and 6. It is. In other words, if based on the blending range of Fig.
• point b iron ore A: 7 mass%, iron ore B: 5 Omass% :, iron ore C: 43 mass%)
• point j Iron Ore A: 9 mass%, Iron Ore B: 41 mass% :, Iron Ore C: 5 Omass%)
• Point i Iron Ore A: 3 17436
• iron ore B 20 mass%:, iron ore C: 50 mass%)
• point e iron ore A: 4 O mass%, iron ore B: 3 6 mass%:, iron ore C: 2 4 naass%
• point f iron ore A: 4 O mass%, iron ore B: 4 O mass%, iron ore C: 20 mass%
• point g iron ore A: 30 mass%, iron ore Stone B: 5 O mass%, Iron Ore C: 2 O mass%).
• the limit line h in Fig. 4 and Fig. 6 defines more preferable blending conditions from the viewpoint of ore granulation.
• the range surrounded by point j, point c, point d and point i, which deviates from the preferred range defined by this limit line, is the particle size of 0.25 derived from iron ore C (maramanpa ore).
• the blending range must be 2.5 mass% or more .
• the blending ratio of iron ore A, B, and C is within the range defined by the limit line E ⁇ It is preferable to be within the range surrounded by point b, point j, point point e, point f and point g.
• the amount of raw ore in the sintered raw material (iron ore) A + B + C) is preferably 6 O mass% or more.
• the amount of raw material ore is in the general range in the current sintering operation. However, if the raw material ore (iron ore A + B + C) content is less than 60 ma S s%, it depends on other raw materials. Since the influence on the sinterability becomes obvious, the effect of the present invention is difficult to obtain.
• the raw ores to be blended in the sintering raw material are three types of iron ores A, B, and C.
• the raw material ores are mixed with auxiliary ingredients for component adjustment (for example, C a O-containing auxiliary raw materials, S i 0 2 Contained auxiliary materials, etc.), granulation aids (for example, quicklime), recovered powder in steel mills (mainly iron sources such as dust), carbonaceous materials (coatus powder, anthracite, etc.), sintered ore sieve powder Etc. are mixed to form a sintering raw material, and an appropriate amount of water is added to the sintering raw material and mixed and granulated.
• auxiliary ingredients for component adjustment for example, C a O-containing auxiliary raw materials, S i 0 2 Contained auxiliary materials, etc.
• granulation aids for example, quicklime
• recovered powder in steel mills mainly iron sources such as dust
• carbonaceous materials coatus powder, anthracite, etc.
• This granulated compounded raw material (sintered raw material) is filled on a pallet of a Dwytroid-type sintering machine to a specified thickness, and after igniting the charcoal on the surface layer of this packed bed, air is directed downwards.
• the charcoal inside the filled bed is combusted while sucking the bow I, and the blended raw material is sintered by the combustion heat to form a sintered cake. Then, by sintering the sintered cake, the product sintered ore having a particle size of several mm or more can be obtained.
• raw materials for sintering compounding raw materials
• raw material ore Pulverized ore
• sintered undersieve powder is 1 Omass%
• in-house recovered material mainly iron source
• auxiliary raw materials 12 to 13 mass% of grain pine was blended.
• raw ores two or more of iron ores A, B and C specified by the present invention were used. Mix this sintered raw material with a drum mixer for 3 minutes, adjust the humidity, and then put the pseudo particles obtained by granulating for 3 minutes into a 30 Omm diameter pan test device to a layer thickness of 40 Omm. After igniting at 1, it was fired at a constant negative pressure of 1 OKP a to produce sintered ore.
• Iron Ore B Hematite Ore 'Magnetite Ore Iron Ore G: Mara Mamba Ore
• Comparative Examples 15 to 17 have good quality and yield as sintered ore, and the production rate is also good, but the raw material cost is very high, and it is actually adopted for the supply and demand balance of raw materials. This is an example of a raw material formulation that is difficult to do.

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