TWI299363B - Method for manufacturing sintered dre - Google Patents

Description

1299363 IX. Description of the invention: [Technical field to which the invention pertains] The present invention relates to a method for producing a sintered ore which is used as a main raw material of a blast furnace or the like. [Prior Art] The sintered ore of the main raw material of the crucible furnace can be usually produced as follows. First, the powdered iron ore is blended with a raw material containing Ca0 such as lime powder, a raw material containing S1Q2, and a carbon material such as coke powder, such as a stone or a snake, a rock, and the like, and added with appropriate water. This combined granulation. The granulated material is sintered into a raw material (sintered raw sputum is poured onto a pallet of a German-outer Troyd type sintering machine to a thickness of no 疋, and the carbon material in the surface layer of the packed bed is ignited, and then attracted from below. The air is burned to the inside of the packed bed, and the sintered raw material is sintered to obtain a cake. Then, the sintered cake is pulverized and sized to obtain a particle size of several or more. Finished sinter. For high-quality sinter ore, it is necessary to have high-quality sinter. In general, quality, shu 11 er strength (cold strength), reduction pulverization (4) DI) 'is (IV) (RI), etc. As an indicator, the quality of the finished sinter with this index as a target has a great influence on the stability of the raw material feeding state of the blast furnace operation, the ventilation property and the liquid permeability in the furnace, the reduction efficiency of the ore, and the high temperature property. Therefore, strict quality control f must be carried out in the process of sinter. In addition, in order to reduce the manufacturing cost of the sinter, it is necessary to improve the sintering, and to improve the efficiency and productivity of the sinter ore 312XP/invention specification (supplement)/94_丨2/94 m] 79 5 1299363 However, the raw material iron ore of sinter has mainly used hematite and magnetite. Recently, the supply of such good iron ore has gradually decreased, so that lignite is used. The crystallization of mineral ore and Mara Mamba ore (all of which is iron ore produced in Australia) is increasingly urgent for iron ore with high water content, and its use will inevitably increase in the future. Here, the so-called Maramanba ore is a general term for iron ore produced in the Maramamba deposit in Australia. It is usually made of goethite (Fe2〇3·H2O) and martite (Fe2〇3 with magnetite structure) as the main mineral, and contains crystals at a high content of about 5%. The ore of water. The name of the product is representative of iron ore such as the West Angel as mine and the MAC mine. Further, a representative example of the limonite ore is a pistolite ore. This bean ore is usually embedded in the internal structure of goethite (Fe2〇3 · H2〇) in the gap of hematite (Fe2〇3), and has a high content of about 8%. An ore containing crystal water. In the name of the product, there are representative iron ore such as the Robe River barrier and the Yandigogina mine. Further, iron ore having a P content of less than 0.10% by mass (usually 0.06 mass% or less) as compared with the above various iron ores, usually, an iron ore having a P content of 0. 10% by mass or more Stone is called high ore. When such iron ore having a high P content is used as a blast furnace raw material, the P richness of the produced molten iron is high, and the load of the dephosphorization treatment is increased, so that it has hardly been used in the past. However, due to the decreasing supply of good quality iron ore as described above, the amount of such high-phosphorus ore blended in the sintered raw material has also been reviewed. 〇6 312XP/Invention Manual (supplement)/94-12/94134179 1299363 ; In the case of the water, ore, as the sintering raw material, the door, and the mouth are pointed out as 'the problem': (1) Since the crystallization water should be detached during the sintering, it should be thermally compensated, so corresponding to this section, Carbon raw materials ^ 厌, etc.) must be handled; (2) due to the crystallization of water, the molten liquid formed in the melt reaction will cause local over-sweet reaction, and the result is that gv-induced productivity and finished product yield are reduced. 'The problem that has been pointed out is that, especially in the minerals of Malamamba, the fineness of the fine powder is mostly poor, which causes the deterioration in the sintered bed (sintering raw material layer) to lower the strength of the finished product, accompanied by the productivity. Problems such as reduced yields.丨~玍座手一成.口

Shi Baibai knows that the use of micro-powdered Maramamba ore to make sinter ore is to strengthen the granulation by mixing (4). It has been proposed to carry out the high-speed (four) of the sintering raw materials of the Maramamba ore. In the technique of the patent document 1, the technique of the patent document 1 requires a special stirring of the handcuffs, and there is a problem that the equipment cost and the processing cost increase. In addition, according to the review of this issue, etc., it was found that even if the granulation strengthening of the sintering raw material with the malad ore is carried out as in the patent document, the productivity and the yield are not necessarily improved. In the case of Ba ore, the sinter is very low in cold strength (shutter strength). "b' and 'about" high-grade ore, because there is almost no use as a result of burning in the past, so in the case of a considerable amount of sintering raw materials =, the quality of the surname mine and the impact of productivity, finished product yield = Therefore, the inventors of the present invention investigated and reviewed the effects of 312ΧΡ/inventive specification (supplement)/9 wood 12/94134179 7 1299363 quality of high-floating batch sinter, and found that the cooperation of high-phosphorus ore was found. When the amount is increased, the cold strength and productivity of the sintered ore tend to be lowered. SUMMARY OF THE INVENTION An object of the present invention is to provide a method for producing a sintered ore which can be produced irrespective of the type of raw ore to be blended in a sintered raw material. High-quality sinter mines, that is, even in the case of blending a considerable amount of high-phosphorus ore or malamamba ore, can produce high-quality cold-sintered south-quality sinter with high productivity and high finished product yield.

When a large amount of Maramanba ore is blended in the sintering raw material as described above, the improvement of the cold strength, productivity, and finished product yield of the finished sintered ore may not be improved by the method of granulating the sinter raw material shown in Patent Document 1. There is a sufficient effect, and this situation means that the essential problem is not in the granulation of the raw material, but in other factors. Therefore, the present inventors conducted various experiments for exploring this part, and also conducted various reviews on the influence of the cooperation of high-phosphorus ore on the quality of the finished sintered ore and the improvement measures, and found the following facts: (1) Iron ore as a raw material for sintering, regardless of its type, the original ore particles have fine pores inside, and the fine pores of the Maramanba ore are much more than other ores. Therefore, the molten liquid formed during the sintering process is soaked into the original fine pores, so that the melt between the ore particles is insufficient, and as a result, the cold strength of the finished sintered ore is greatly reduced. The relationship between the fine pores inside the ore particles and the melt, and the cold strength of the finished sintered ore depends on the raw ore blended in the sintered raw material 8 312XP / invention specification (supplement) / 94-12/94134179 1299363 The average amount of pores, therefore, regardless of the average pore volume of the stone of the burning '= Zhongshi can effectively improve the cold strength of the finished sinter 0 2, thus even in the case of a large amount of Maramanba ore, dream Widely select and adjust the type of other ores to be matched or the ratio of the ratio of the others. The average pore volume of the raw ore blended in the sintering supplement is below the level of the mouth, which can be based on high productivity and high yield. High quality sinter of the rate. 〇 7 strong (4) On the other hand, when the high-phosphorus ore is blended in the sintering raw material, the influence of the matching disc ore on the finished product of the sintered ore can not be evaluated from the porosity of the ore. That is, the average stomatal amount of 'Gaoxiangshi is large, iron=between the Maramamba ore, but even according to the (4) milk hole volume, the high-scale ore; 5(4) the above (3) benchmark with sufficient cold strength . (5) The reason is that 'the high phosphate ore has a higher proportion of the fine powder than the other ores, and the content of Ah〇3 in the fine powder is quite high, because of this j The aeration is deteriorated, and the cold room of the sinter is deteriorated. Therefore, in addition to the amount of pores: the shape of the pores: the influence of the above points must also be considered. The present invention is based on the above findings and is characterized as follows: - [1] - a method for producing a sintered ore" is selected from the group consisting of iron ore A, which is at least a part of a raw material ore. The average pore volume of the mercury intrusion measurement method is 0. 03~〇. 〇5cm3/g (wherein, the pellet mineral material '312XP/invention specification (supplement)/94-12/94134179 9 1299363 (pellet feed) Except); ..; iron ore 0.07~o.ow/g; at least, the average amount of pores is B, C is the iron ore excluding the p content (where iron ore A, 2.0% by mass or more) ), and; contains: Li: above and Al2. 1 content is 2. The amount of 〇f is more than = G.1Q% by mass and Al2〇3 ore; characterized by, sintering of the feldspar D Raw material manufacturing sintering

The following formula (1): x [Βο/〇] + 0· 〇8 · ··· (1) χ average pore volume χ=0· 04 x [A%] + 0· u [C%] + 2 Ο x 0. 〇6 χ [〇%] (where, [A%]: [iron ore volume] / [iron ore Α, β, c, k [B%]: [iron ore B amount ] / [Italian stone A, β, c, d: [c%]: [iron ore c amount] / [iron ore a, b, c, d twenty quantities [iron ore D amount] /[Iron ore A, B, c, D^f ten amount]) • The average pore volume 铁 of the defined iron ore is 〇〇9cm3/g or less to match the sintering raw material of iron ore. Sinter. [2] In the above production method, the stone B is sintered in the raw material. [8] In the production method of the above [1], the sintered raw material is blended with iron ore 'stone A, iron ore b, and iron ore C. [8] In the manufacturing method of the above [2] or [3], the ratio of iron ore 6 to iron ore A, iron ore beta, iron ore c and iron ore]) is 20% by mass or more. The proportion of iron ore strontium is preferably 20 to 70% by mass, particularly 1 ΧΡ 2 ΧΡ / invention specification (supplement) / 94-12/94134179 1299363 is preferably 20 to 60% by mass. [5] In any one of the above [2] to [4], the ratio of iron ore D to the total amount of iron ore A, iron ore B, iron ore C, and iron ore D is 20 More than % by mass. The ratio of the iron ore D is preferably 20 to 60% by mass, and more preferably 20 to 50% by mass. Here, the average pore amount of the iron ore specified by the present invention is for the particle diameter of 4 to 7 mm. The average value of the micro-rude pores measured by the mercury intrusion measurement method (injection pressure: 0. 007 to 412 MPa) using a mercury intrusion type pore size measuring device (N=10 average value) Further, the above-mentioned pressing pressure range is a pressure at which the pore amount of the pore diameter of 0.035 to 200 //m can be measured, and by measuring in the pressure range, a usual mercury intrusion type pore distribution measuring device can be used. The fine pore amount of the iron ore A to C and the iron ore D of the object of the present invention is accurately measured. According to the present invention, the specific pore amount of the raw material ore which is incorporated in the sintering raw material is adjusted and the special phosphorus ore is considered. The specific average amount of porosity defined by the nature, regardless of the type of raw ore, can produce high quality Burning® ore; that is, even when combined with a considerable amount of high phosphate ore and/or Maramanba ore, High productivity and high finished product yield high cold room High-quality sintered ore. [Embodiment] It is explained that the iron ore (iron ore A to C) other than high-phosphorus ore is described. Figure 1 shows the manufacture of sintered ore using a real machine. In the test, change the blending ratio of Maramanba ore in the raw ore, investigate the production of sintered ore 312XP / invention manual (supplement) /94· 12/94134179 1299363: medium ^ horse; krf rate, " In this operation (3 days in the whole process), the ratio of raw ore 2, and the ore ore to the ore of ordinary ore is as shown in the figure 'Quality y: change for the following three levels: ( a) Hematite ore: 1〇〇20 shell hematite ore: (10) Please, Maramamba ore: granulation method and granulation conditions. The sintering raw materials belong to the mineral system. Also, the conditions of the red iron are ^1~(M°untNewman). Other manufacturing and operation Machine materials:: ratio of quicklime: 2·. · Sintering degree 580·, and, in addition, adjust the lime in the sintered raw material. Fineness I: Check the ratio of dolomite to make the sinter ore = amount%. 2Sl〇2. 5/1% by mass, CaO: 10.2 Qualitative f:%, MgO: 1. 〇: Figure, 1' with the proportion of the Maramanba ore in the raw ore two plus 'finished sintered stone The productivity and yield are reduced. For the reason, the result of the factory, 'can confirm that: if the proportion of the Maramanba ore is increased by ', then the strength of the sintering cooling room is reduced', which results in a decrease in productivity. In the manufacture, the H in the raw ore is operated at the following two levels: (4) Hematite of the fine powder: Ybori% other stone (general ore mainly composed of hematite ore): about 9〇 Quality m) Maramanba ore: about 1G f%, other ores (ordinary ore mainly composed of hematite ore): about 90% by mass, finished product 312XP / invention manual (supplement) / 94-12 /94134179 12 1299363 « Explosion # intensity] and productivity and other changes in the inspection of the grain ^ n in the general raw material in the vermiculite in the fine powder town (pill changed to the original =.:: two 1τ% of the sintering raw materials, = 1 « The granulation method is about 10 mass granulation granulation method (so-called qing method) red ^ sinter reinforced with raw materials. HPS method) granulation of sinter sintering raw materials to make the results according to Figure 3, relative to The raw material ore pellets) (she-, Yu; its::: cold strength-strength) is greatly reduced, a few It can be confirmed from the results of Fig. 3 and Fig. 3 that, irrespective of the granulation method or the conditions of the granulation, the cold strength of the finished sinter is blended with the Maramanba and the stone at a certain proportion. Will decrease. Here, it is known that the horse f ^ = ore is compared with other iron shirts, and the fine pores of the ore particles (four) are not suspended. It is considered that such fine pores existing inside the ore particles may affect the molten liquid formed during the sintering process. Behavior, which adversely affects the cold strength of the finished sinter. Therefore, the sintering raw material of the raw material ore shown in Table 1 was fired using the test apparatus shown in Fig. 4 having the test 〇〇 χ _ __) and the X-ray α device (sintering wind speed. 0. 29Nm) /s, coke ratio: 5, 5%, mixed raw material (five) ratio: 9. ^, mixed raw material Si〇4: 5.0%, raw material particle size: _3 leg), raw material ore and sintered cake stomata during sintering The structure and the turbid fluid flow condition 312XP / invention manual (supplement) / 94_ 12/94134179 1299363 for analysis. [Table 1 ]

Μ: Traden Newman *2 : MAC *3 : Yan Dick Gina ^ In this test, the match was made to match the table. The original of the n = 3 = the sintering of the stone, the x-ray CT image of the raw material enamel and the sintered cake of the material process towel from the start of sintering to the completion of the sintering. Fig. 5 shows the completion of the latter of the x-ray CT image of each sintered cake. According to the #x ray α image, the analysis of the pore structure of each raw material ore and the sintered cake in the sintering and the analysis of the flow state of the blister were carried out by the following method. In the analysis of the milk hole structure, as shown in Fig. 6, the 乂 ray image is binarized into a solid portion and a vent portion, and then thinned, and the image is thinned to obtain a branch ( Branch) (the total area of the pores ymni2) and the total length Lbt (mm), the branch width is determined by the branch width = Ap / U)t. This branch width corresponds to the existence of the voids large/1, 〇 in the sintered_internal, and the analysis of the flow state of the melt, as shown in Fig. 7, two X-ray α images separated by time intervals (χ α α image i = ti seconds 'X-ray CT image 2 = t2 seconds) Binarization becomes a solid portion and a pore portion, and based on the binarized image, the solid portion is obtained between [t2_tl seconds] Change to 312XP/Invention Manual (Supplement)/94·12/94134179 1299363 = Partial area S1, and the surface which is changed from the pore portion to the solid portion in the same way = = = Spray ((4)) Find the refining: 纟" The flow index of the insect liquid is an index of the amount of movement of the molten W liquid between the raw ore particles (preparation of the amount of movement between the i & pq ^ mother early position). (4) The analytical result of 甩 4 in the process of 8 no sintering. Therefore, the two original stone and the Lai ore: 60% by mass) and N〇3 (=f: 4〇% by mass, Malamamba Badan G/W+ human (hematite 40% by mass, limonite: (9) In the test case of the car, 11 (Red _: _ mass %): the growth rate of the knife ί and the branch width of the sintered cake are quite small. 10 〇 2 = Γ Ν〇 · 2 and Ν〇 · 3 Next, with Ν .1 (hematite: 00; f) cross-phase Fortunately, slow growth, and the large pores and becomes difficult.

No 3 (i: t. 40% by mass, Maramamba ore: 6. Mass%) and No. 3 (hematite··4 〇 quality Jin%, said / No??) / Iron ore: 60 Compared with the mass %), the branch width of No.3 is larger than that of 0.2. The pores generated during the knotting process are mainly formed by the melt movement of the melt between the ore particles (ie, dazzle It is a pore), and thus, the portion of the branch width forms a t-fun f per force 丄, a growth rate of + is large and the branching of the sintered cake; a large solid 9 A system is thought of a melt between the ore particles. The relationship between the number of m of the branching households and the growth rate of the branching degree according to the result of Fig. 8 clearly shows that the above-mentioned needle-coordinating (four) stone types are different from those of the same (4) and are stored in the ore particles. The original traces of the two: according to J12XP / turn the instructions (supplement) / 94-12/94134179 15 1299363 Take the Malamamba ore and hematite ore as an example and according to the schematic diagram of Figure 10, in the figure In the case of the Maramamba ore shown in 10(a), compared with the ore, there are many micro and fine pores inside the ore particles. A considerable amount of the melt generated around the ore particles is absorbed into the fine pores, and as a result, the melt between the ore particles is shifted by a small amount, and the melt formed during the sintering process becomes a knot. : The binder between the ore particles, if the amount of the molten liquid is absorbed in the fine pores, the amount of the binder used to combine the ore particles is insufficient, and the result may cause the cold strength of the sintered ore to decrease. Therefore, in the case of the hematite ore shown in Fig. 1 (b), most of the molten liquid generated around the ore particles is not received and received due to the fine pores inside the ore particles. When the fine pores are left in the pores and remain between the ore particles, the amount of movement of the melt between the ore particles is increased, and as a result, the pores are enlarged. Further, since a large amount of molten liquid remaining between the ore particles becomes The binder is bonded between the ore particles, so that the sinter with high cold strength can be obtained. φ From the above results, it is known that the cold strength of the finished sinter is to be increased, and the raw ore to be blended in the sintered raw material is limited. The average pore volume is effective, and regardless of the type of ore, a finished sintered ore having a cold strength of more than a predetermined level can be obtained. Therefore, even in the case of a large amount of Maramanba ore, by appropriate adjustment and selection The ratio of the other ores of the other ore to the ratio of the average ore content of the raw ore can be used to obtain a high-quality finished sintered ore with high cold strength. Figure 11 shows the mercury intrusion measurement method. Mercury press-in type pore distribution measuring device, measured under pressure: 〇·(10)7~412Mpa) 312XP/invention specification (supplement)/94-12/94134179 16 1299363 red ore, malamamba ore And a plot of the pore size distribution of the limonite ore (the ore) is a long-term search 4~7_ = sample = pore size distribution, according to the pore size distribution, except for the ore) according to the behavior of the dazzling melt: 'described later W widows can be roughly classified into the following three types: Average pore volume of fine pore iron ore A: 0.03~〇.〇5cmVg Average ore content of iron ore B: 〇1〇~〇12cm3/g Iron ore C Average pore volume: 〇.〇7~〇.09cmVg Here: the main ore contained in iron ore A can be exemplified = iron ore, and the main ore contained in 'iron ore B can be exemplified by Ma Ba Ba Shi Guang Shi; the main part of iron ore c The ore may be a limonite ore represented by a stone: stone. The three types of iron ore A吒 were repeatedly subjected to a sintering test, and it was found that the iron ore was blended with the sintered original = I for the result of sorting the fine pore amount and the cold (four) degree of the ore. The average pore of the iron ore associated with the behavior of the melt can be defined by the following formula (a), and by setting the average pore volume to 〇.〇9 Cm3/g or less, the finished sintered ore can be effectively improved. The intensity of the cold. In addition, the average amount of pores is measured by a mercury intrusion measurement method (injection pressure·· 〇· 007 to 412 MPa) using a mercury intrusion pore size distribution measuring apparatus for ore having a particle diameter of 4 to 7 mm. The average of the amount of stomata (the average of N = 1 )). Average stomatal amount Χ=〇· 〇4χ[Α%] + 〇·11χ[Β%] + 0· 〇8χ[α] ......(a) 312Xp/invention manual (supplement)/94-12/94134179 17 1299363 (Where, L:;丨.丨: ore A*]/[total amount of iron ore A, B, C, D] Quantity]/[Iron ore A, B, C, k_]

And it is known that: with the Bachengcheng, Wang J ore - part of the pellets is used as a raw material for sintering magnetite, but, because of the mine! The upper system belongs to hematite and right private husband Dan / township, ~, so the behavior of its fine pores on the smelting fluid = i: r. Therefore, in the present invention, the pellets are excluded from the iron ore. The above-mentioned conditions are suitable for the combination of the iron ore a, b, and c, and there are some differences when the 5-way phosphate ore is used as described below. Sex:: Group::!?:, Maramamba ore, which is reduced in quality (/,,,, σ, daily water s, high correlation, high heating, 乂 cloth: two r flat: Table 2 'Similarly, the representative particle size composition (particle size Γ??) is shown in Table 3. According to this, the p 丨 of the high-phosphorus ore: Dan: u feldspar is still much, compared with the usual p ores of other ores!: It is 06.06 mass% or less 'it contains 0.10% by mass or more of P. Further, (4) the ore content of ore is relatively high, being 2 G mass% or more, and (10) being lower than limonite ore but being hematite The ore is about 2 times. The ~ ore particle size composition is characterized by the particle size (4) ^ for the 3 job 'with the Maramanba ore - the sample height is 1.86_, which is the fine grain with the Maramanba ore. From the characteristics of the above-mentioned so-called high-scale ore, it can be seen that the high-scale ore can be composed of p content and Ah〇3 content with other ores (previously listed iron ore 312XP/invention specification (supplement)/94-12/ 94134179 18 1299363 A to C) are distinguished. Therefore, in the present invention, the P content is: 0.1% by mass or more, and the Al2〇3 content: 2.0% by mass or more of ore is defined as " High phosphate ore."

312XP/Invention Manual (supplement)/94-12/94134179 19 1299363 i 1ΌΙ *6 (Quality 1» 4 40 ai 10· 40 1.54 LO τ—1 od 〇1—Η inch · Chemical composition (quality 1%) TH CD r—Η 〇· 0.00 τ—Η CD CD CD CD CD τ·—H czi τ· η, < CD 1—Η CD 1 < CZ5 g pL-ι 0.47 0.10 0.14 0.27 0.93 r—Η CO 0.033 0.014 0.015 0.002 0.005 0.008 Oh 0.123 0.041 0.036 0.024 0.039 0.052 A1A CO T—H 03 oi OO oo r—H 0.60 1.36 2.03 cS 00 3.47 5.52 oo CX) Inch · 3.11 2.68 CO CO T.Fe 62.70 57.11 58.33 66.60 66.35 62.32 ψ South Shijieshi Guangshimei Loading Mine (1) *1 Brown Iron Prospect (2) Minnan American Red 4 ore *3 Australian Hematite Ore*4 Malamamba Ore*5 s ¥**9* 9* s* I* 6 ii i inch ei inch 6/π46/ffsi)_s?iis distillation/dxn ε 1299363 1 1 iNi(im) 1.86 CO r-H CO CO 2.66 3.36 1.96 ψ\ face c 衾-0.125mm 〇〇1 < CO CO CNJ CQ CJD r-H LO CNJ +0· 125mm LO T-H CJD CO Bu inch +0.25mm CO rH CO rH 0 T—< CO CO +0.5mm rH 1 < D— r—H rH 00 00 τ—Η +1 00 00 t—H LO oa 00 oa CH) t—< rH rH +3imi CO t—H CO r—H 00 t—H CO τ—Η Bu+5nm t—H r—H CO r—H CO rH r—H CH) +8mn rH CD 00 CNI Bu CO +10nm CD inch 1-H CO CO .Aftiij ψ 粦 石粦石广石< /^N rH 赛红铁矿(2) 柁南美产赤四载矿 ore*3 Australian hematite ore*4 Malaman巴矿石*5 9兴Co* 3⁄43 I*

I 6 I I inch ε I inch 6/3 r inch 6/ff}ffi)_^?is^/dxrNll e 1299363 %:::=石::=石(,5"quantity mass ratio with chemical group & ° / stone 4Q shell amount %) of each particle size . 063_ below two IV according to this 'high-scale ore particle size secret contains two cases of eve up to 24% by mass, and its fine powder

Ai2〇3;:;:;^ The original two stones 4 ?〇. 1~N〇, 3 represents the limonite ore 1 ° ° fine texture combined with the raw material replaced by the sintered stone (4) X : 3〇〇" Φ ι ι This month's raw materials are packed tightly; Second!! The mid-speed and sintering time are shown in Figure 13. Other 兀,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, Raw material particle size: The quality, productivity and yield of the finished sinter obtained are shown in Figure [Table 4]

No. High phosphate ore limonite ore (2) 1 - 100% by mass 2 Redundant amount % 70% by mass 3 60% by mass —---__ 40% by mass According to Fig. 13 'With brown relative to No. 1 Iron ore ore i 〇〇 mass % increase the amount of high-phosphorus ore (substitution amount) (Ν〇 · 2 + Ν〇 · 3), because it is replaced by a specific gravity i and coarse-grained limonite ore, so the volume The density increases while the false particle size decreases. Also, with the increase in the amount of high-phosphorus ore, the 312XP/invention specification (supplement)/94-12/94134179 22 !299363 will reduce the wind speed (ventilation) during sintering and the sintering time will become longer. Also, Figure 14. Although the addition of high-phosphorus ore is increased, it is replaced by the ore, and the productivity and yield of the finished sinter are also reduced. Specifically, the high-phosphorus ore is replaced by the limonite ore of 丨〇% by mass, and the productivity is lowered by 〇.〇lt/hr·m2. The surname for the reason for the inspection confirmed that if the amount of high-phosphorus ore is increased, the sinter: cold: 3 degrees T decreases, which results in a decrease in the yield and productivity of the finished product. Further, as the amount of the high-phosphorus ore is increased, the reduction property is changed, but the reduction powdering property is deteriorated. Figure 15 is a sintered raw material with 1% by mass of limonite ore (Table 4: 1.1), 60% by mass with high-grade ore, 40 G ^ for limonite ore, NQ · 3 In the above sintering test, it burns. The change in ventilation is carried out by the inspector. According to this, it is known that the sintering time of the sintering raw material of the N 〇i limonite ore is 1% by mass, and the sintering time of the sintering raw material of No. 3 of the household and the stone is longer, and the air permeability is improved. The change in the air permeability (gas wind speed) in the sintering process is: the gas force: in the sintering raw material of the Γ广石, the venting property is changed in the main 3 + & The difference between γ and ρ is to dominate the venting resistance under the smelting zone. The effect of the deterioration of the semi-sintering after sintering is: from the wide... The granulated pseudo-particle size is not fine, the feldspar is fine, so granulation Reduced (the aeration of w is worse, but its effect is small; on the other hand, in the main high scale 3) 2XP / invention manual (replacement purchase 2/94134179 23 !299363 significant, this pair of cold strong ore molten state The degree of deterioration of the air permeability under the (melting zone) has a significant adverse effect on productivity. Cheng = the result of the exhaust group of the same sintering material as that of Fig. 15 when it is fired. Stone hired stone 1 η η #曰. · 1 with the limonite Ν: two shells!% of the burnt 'coordinated with high-scale ore; ', • The concentration of C0 in the exhaust gas of the k-knot material is increased by 1 to 丄I, and the concentration of C〇2 is lowered. The burning property of coke is hindered by the combination of high-phosphorus ore. It has been reported that if the fluidity of the melt deteriorates, the proportion of burnt gas surrounded by the melt is increased, and as a result, the combustion of coke is hindered (iron and steel, vol.78 (1 99 / , ° P· 1 053) 〇' The deterioration of the above-mentioned air permeability (Fig. 15) and the deterioration of coke flammability (the reason for the figure is that the fluidity of the melt at the time of firing is lowered due to the combination of high phosphate ore. The inventors of the present invention have focused on the composition and particle size composition of the previously-expressed high-phosphorus ore, that is, the ratio of the fine powder to the φ is large and the Al2〇3 content in the fine powder is very high. It is presumed that the fine powder which is the main part of the source of the melt is contained in the fine powder which is the base of the melt and contains a large amount of Al2〇3, which causes the flow of the glutinous rice melt in the case of the high phosphate ore. The reason for the poor sex, in order to confirm this argument, The following experiment was carried out: in a CaO-Fe2〇3-based melt having CaO: 20% by mass and Fe2〇3: 80% by mass, respectively, 5% by mass, 1% by mass, and 2% by mass. The Al2〇3 reagent was added in a ratio of 6 mass% to 8 mass%, and the viscosity of each melt at each temperature of l30〇°c, 1350°c, and 14〇〇°C was measured. 24 312XP/Invention Manual (Supplement) /94·12/94134179 1299363 ^, usually, 130 (TC is equivalent to the upper layer temperature of the sintering bed, 14 〇〇 is the temperature below the sintering bed. The viscosity of the molten solution is determined by the ball Pull the law. This measurement method is based on the moving speed of the balance pointer in the section when the ball suspended from the melt and melt is pulled up. The result is shown in Fig. 18, and it is known that the temperature of the melt is not compensated. The amount of addition of Al2〇3 increases, and the viscosity of the melt also rises. ★ Then, using the melts showing various viscosities in the above test, the soaking speed of the smelting liquid in the packed bed was measured, and the relationship between the viscosity of the melting liquid and the immersion speed of the molten liquid in the packed bed was measured. The soaking speed was measured by the soaking test apparatus shown by f19. In this test apparatus, a filling layer of glass beads was formed in a vertically long cylindrical container. The molten solution was dropped from the upper portion of the packed bed to measure the rate of penetration of the molten metal in the packed bed. Fig. 20 is a graph showing the relationship between the viscosity of the melt and the permeation rate based on the measured impregnation speed of the melt. It is understood that the viscosity of the melt increases and the flow rate (fluidity) of the melt decreases. • From the above results, it can be inferred that in the case of high-phosphorus ore, the fluidity of the molten liquor is lowered due to the increased viscosity of the melt due to the concentration of fine powder of A 12〇3. That is, the amount of movement of the turbid liquid between the ore particles is reduced, which hinders the growth of the pores in the sintered cake, thereby causing ventilation; the poor quality of the raw coke and the deterioration of the coke combustion, and the cold of the finished sinter, The strength is lowered and the productivity and the yield are lowered. In addition to the iron ore f A to C, the above-mentioned average pore volume should be considered in addition to the iron ore f A to C. The effect on the intercooling strength must also be considered due to the fine powder (A12〇3 concentrated Melting solution 312XP/invention manual (supplement)/9 (12/94134179 25 1299363 _ reduction in cold strength caused by lowering the dynamics, etc. into the first, with the same mercury intrusion as in Fig. 11 Determination method (silver pressure, j pore distribution measuring device, under pressure: 0 007~412M cation::) to check the pore size distribution of high phosphate ore, according to the pore diameter:: no weighting average As a result of the amount of pores, it is known that high-phosphorus ore (the average pore volume of iron ore (fine I related to the behavior of the melt) is within the following range. • Average ore content of iron ore D·· 〇 .〇5~〇〇7cmVg and 'Sintering test with this high-filled feldspar (iron ore D) and the above three types of iron ore 2' to the above-mentioned high-phosphorus ore (iron ore D) In addition to the results of the relationship between the amount of fine pores and the strength of the finished product, it is known that: With::=Iron:Guangshi_In case, it has a correlation with the behavior of the squirting liquid: = The amount of stomata can be defined by the following formula (1), and by using the hole 1 X, it can be effectively used by the water (4) Hole distribution (4) The mean value of the water measurement method (injection pressure: 0.00wl2Mpa) (the average value of N=l〇), and the average pore volume in the pupil X--0.04xu%]+011 x [called [C/〇]i2. Ο x 0. 06 X [D%] , r 甘由" ...... (1) (wherein the total amount of β is the sum of D) [A%] ··[Iron Ores A amount] / [iron ore Α, β, c [B%] · [[iron ore beta amount] / [iron ore A, β, c 3] 2 ΧΡ / invention manual (supplement) / 94 -12/94】34179 26 1299363 [c%]: [Iron ore c amount] / [Iron ore, β, c, D of human leaves [W: [iron ore D amount] / [iron ore a, b, c, d: Figure 21 is the result of the above test, the average porosity of iron ore (including iron ore with high phosphate ore) in the sintered raw material is 1 (two The relationship between the average pore volume x) defined by the formula (1) and the cold strength (shutter strength) of the finished sintered ore. As shown in the figure, it is known that the iron ore blended in the sintered raw material The average stomatal amount X of the stone is set to be below dVg, so that the cold strength (shutter strength) of the finished sinter can be above the management value of 89.5%. The average stomatal amount is preferably 〇·04~0·08cm3/g. Therefore, in the present invention, 'made of a sintered raw material which is synthesized from iron ore of at least two kinds of iron ore A to c which is at least a part of raw ore, and iron ore = stone stone) When the sintered stone is wide, the average pore amount X of the iron ore defined by the above formula (1) at the time of sintering is 石石广. CD1(9) is combined with iron ore' to produce a sintered ore according to the present invention from the sintered raw material, and is combined with a considerable amount of iron ore B of the itba ore and iron of the high-scale stone Ore _ two temples are useful 'for example, (1) for iron ore A, iron ore B, iron ore: iron ore D total (which includes unmatched human iron ore a~c upper 壬 - The case ratio of iron ore B is 2〇f amount 0/〇 with iron compounding amount in combination with iron ore (4); (2) total for iron ore A, iron ore C, and antimony ore D The ratio of the iron ore D of the amount (which is not included in the case of any of K-stone AC) XP/invention said that the duck (turning 12/94134179 27 1299363 is 20% by mass or more with a high blending amount) The case of iron ore D; (" the total measurement of iron ore A, iron ore B, iron ore c, iron ore ( (which includes the unmatched human iron ore K) / The ratio of iron itr is 2G mass% or more, and the blending ratio of iron ore D is 2 mutex or more, and the amount of iron ore B and iron sulphate D is blended with the same amount, etc. In the form, high-quality sintered ore with high cold strength can be produced under high yield and high productivity. [Simplified Schematic] Figure 1 shows the blending ratio of the Maramanba ore in the raw ore and the finished product. Figure 2 is a graph showing the relationship between the productivity of the sintered ore and the yield. Fig. 2 is an explanatory view showing the mixing ratio of the raw ore in the test of Fig. 1. Fig. 3 is a view showing an example of a mixture of fine ore or ordinary ore in the sintered raw material. A graph showing the coke ratio and the change in the cold strength of the sintered ore with the operation example of the Malamamba ore + ordinary ore. Fig. 4 shows the pore structure and molten solution for the raw ore and the sintered cake in the firing. Fig. 5 is a view showing an example of an X-ray CT image of the sintered cake obtained by the test apparatus of Fig. 4. Fig. 6 is a view showing the raw material ore used for the firing. And the explanation of the method used for the analysis of the pore structure of the sintered cake. Fig. 7 is a diagram showing the method used to analyze the flow of the raw material ore and the molten cake in the sintering. Fig. 8 is a graph showing the variation of the width of the raw material ore and the sintered cake in the firing (stomach) 312XP/invention specification (supplement)/94·〗 2/94〗 28 2899363. The curve of the relationship between the branch width index obtained in Fig. 8. Long velocity and melt flow Figure 1 〇(a), (b) is an example of the production of Λ拉巴 and Hematite feldspar during the sintering process. Behavior, Fig. 11 is a graph showing an example of the pore size distribution of Shiguangshi and limonite ore by the mercury glazing method. Mara Batu 12 shows a graph of the composition of the high phosphate ore and the blended ore. Fig. 13 shows the ratio of N〇1 to N in Table 4 to the raw materials of the raw material ore from No. 3 in the material. Curve of sintering mid-wind speed and sintering time: in two materials: not:: 4 N. · 1~N. · The raw material ore of 3 is matched with the graph of the quality, productivity and yield of the sintered ore produced by the sintering test pin. Fig. 15 is a graph showing the change in the air permeability of "4 Guang," " in the sintered raw material of No. i and Νο. 3 of Table 4, respectively. The graph of the composition of the exhaust gas at the time of firing is prepared by the sintering raw materials of the ore gate of Table 4, respectively. The description of the ball pull method used for the measurement of the viscosity of the secret melt is shown in Fig. 2... (10), 203 is a graph of 4 degrees of occupation. Fig. 19 is an explanatory view showing a device for measuring the penetration speed in the packed layer of the shale liquid, 312XP/invention specification (supplement)/94-12/94134179 29 1299363. Figure 20 is a graph showing the relationship between the viscosity of the melt and the penetration speed in the packed bed. Figure 21 is a graph showing the average pore volume X of the iron ore blended in the sintered raw material and the cold strength of the finished sintered ore (shut ter) Curve of the relationship of strength)

312XP/Invention Manual (supplement)/94-12/94134179 30

Claims (1)

1299363 X. Scope of application for patents·· 1. A method for producing sinter ore, which is selected from: to ^' parts selected from · · iron ore A, measured by mercury intrusion, and: average vent The amount is 0.03~0.05cmVg (except for the pellet minerals ~ = i et f eed), · · Iron ore B, the average stomatal amount is the same as above ~0.i2cm3 / g; iron ore c, the same as above The average amount of pores is -0. 07~〇. 〇9Cm3/g; at least two kinds of iron ore (wherein iron ore A, B, and C are excluded from p content of 〇1〇% by mass or more Ai2〇3 contains 〇 以上 量 ) 、 、 、 ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; Therefore, ° is given by the following formula (1): Ψ Average pore volume X = 0.04 X [Α%]+0·11 X [Β%]+〇·〇8 X [C%]+2.〇χ 0.06 χ [D〇/〇] ·······(1) (Where, [7] • [Iron ore A amount] / [Iron ore A, B, C, D total measurement] [Catch]·[Iron Ore B amount] / [total amount of iron ore A, B, C, D] [C / g ] [iron ore C amount] / [iron ore a, b, C [Total amount of D] [W,: [Iron ore D amount] / [Iron ore A, B, C, D total measurement]) The average pore volume X of the iron ore defined is 〇〇9cmVg or less In the manner, the sintered ore is produced by the sintering raw material of the iron slag. 2. The method for producing a sintered ore according to claim 1, wherein the sintered raw material is blended with iron ore B. 3. The method for manufacturing a sintered ore according to the first application of the patent scope, wherein, 312XP/invention specification (supplement) pulse 2/9413chuan 9 ^299363 sintering raw material φ # 4 such as τ' with iron ore A, iron Ore beta and iron ore c. Tie Yi Er: The manufacturing method of the sinter of the second item of the second division, wherein the ratio of the 舛θ 戥 ore Α, the iron ore Β, the iron ore C and the iron ore ... is 20% by mass or more. W. D. For example, the method of manufacturing iron ore D for calcium into r Λ in the second paragraph of the patent scope of the application, wherein iron ore A, iron ore Β, iron ore Γ Γ 戚 ^ The ratio of the total amount of n is 2% by mass or more. And iron ore D 312XP/Invention Manual (supplement)/94-12W134179 32