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
  • C22B1/24—Binding; Briquetting ; Granulating
  • C22B1/242—Binding; Briquetting ; Granulating with binders
  • C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
• • 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
  • C22B1/242—Binding; Briquetting ; Granulating with binders
  • C22B1/244—Binding; Briquetting ; Granulating with binders organic
  • C22B1/245—Binding; Briquetting ; Granulating with binders organic with carbonaceous material for the production of coked agglomerates

Definitions

• the present invention relates to a method for producing sintered ore for a blast furnace by using, as a part of a raw material, highly crystalline hydroiron ore having a crystallization water content of 3% or more.
• a sinter is generally manufactured by the following method.
• Granulate by adding water.
• the granulated material is charged to a suitable thickness on a moving pallet of a Dwyroid type sintering machine, and the solid fuel on the surface layer is ignited. After ignition, the solid fuel is burned while sucking air downward, and the heat of combustion sinters the blended raw materials to form a sintered cake.
• This sintered cake is crushed and sized to obtain a sintered ore having a certain particle size or more.
• Sinter ore with a particle size less than a certain size (usually -5 mm) is called remineralization and is returned to the raw material of sinter.
• the present invention has been made in view of the above-mentioned phenomena, and its purpose is to use a large amount of iron ore containing high crystal water, such as goethite, as a sintering raw material. It is an object of the present invention to provide a method for producing sinter with a high yield without problems such as an increase in production, a decrease in productivity, and a significant increase in auxiliary materials. Disclosure of the invention
• the present invention has been made to solve the above-mentioned problems, and in producing a sintered ore using a high-crystallite iron ore as a raw material, the high-crystallite iron ore is mixed with returned ore, and granulated. After that, it is a method for producing a sintered ore using a high crystalline water ore as a raw material, characterized in that it is blended with another raw material and then sintered.
• high crystallite iron ore with a crystallization water content of 3% or more and returned ore with a size of 5 mm or less are mixed at a ratio of high crystallite iron ore at a ratio of 1 to 5 or more.
• This is a method for producing a sintered ore using highly crystalline hydroiron ore as a raw material, after granulation and mixing with another raw material for sintering.
• returned ore having a Ca0 content of 8 to 15% by weight as the returned ore, and it is preferable that the returned ore has a smaller particle size, for example, 1 mm or less. It is suitable.
• FIG. 1 is a schematic explanatory diagram of a production process of a sintering raw material.
• Fig. 2 is a graph showing the relationship between the mixing ratio of iron ore A mainly composed of goethite and the yield.
• Figure 3 is a graph showing the pore size distribution of the sintered cake when the mixing ratio of iron ore A was changed.
• FIG. 4 is a graph showing the relationship between the mixing ratio of iron ore A and the moving distance of the melt.
• FIG. 5 is a graph showing the relationship between the moving distance of the melt and the pore diameter distribution index.
• 6 is a state diagram of the C a O- F e 2 0 3 system.
• FIG. 7 is an explanatory diagram of the experimental method of the melting depth.
• FIG. 8 is a graph showing the relationship between the porosity of iron ore and the melting depth.
• FIG. 9 is an explanatory diagram of the experimental method of the melting depth.
• FIG. 10 is a graph showing the relationship between the C a O concentration in the tablet and the melting depth.
• FIG. 11 is an explanatory view of the experimental method of the melting depth.
• Figure 12 is a graph showing the effect of the returned ore coating on the melting depth of iron ore.
• FIG. 13 is a flow sheet of the method for returning and covering coating in Example 2.
• FIG. 14 is a graph showing experimental results in Example 2. BEST MODE FOR CARRYING OUT THE INVENTION
• iron ore a high-crystal water iron ore mainly composed of game sites.
• Figure 3 shows the results of investigation of the pore size distribution of the sintered cake when the iron ore A content was 0% and 40%.
• Figure 3 shows the pore diameter D (mm) on the vertical axis and the pore diameter on the horizontal axis.
• the log ratio R ⁇ %) of stomatal or higher is plotted in log-logarithm. From Fig. 3, it was found that as the mixing ratio of iron ore A was increased, the proportion of coarse pores of about 1 mm to 5 mm increased.
• the yield of the sinter has a high correlation with the strength of the sinter cake, and the yield of the sinter can be estimated from the strength of the sinter cake using the equations (1) to (4).
• the pore size distribution index (/ 3) is the slope of the graph in Fig. 3 and is a value unique to each sintered cake. Using this, c in equation (2) can be obtained from equation (4).
• the yield was determined for each factor. As a result of calculating the change, it was estimated that about 80% of the decrease in yield was due to the decrease in the pore size distribution index. From the above, it is considered that the decrease in yield due to iron ore A is caused by changes in the pore structure represented by the pore size distribution. Therefore, the change in the pore structure with the increase in iron ore A is caused by the flow of the melt that governs the coalescence of the pores. Considering that there is a close relationship with the mobility, we measured the movement distance of the melt as an index showing the properties of the melt and investigated the effect of iron ore A on the fluidity of the melt.
• Figure 4 shows the results of measuring the moving distance of the melt using SrO as a tracer under the condition of constant heat input. From Fig. 4, it was found that the movement distance of the melt decreased with the increase of iron ore A.
• Fig. 5 shows the relationship between the moving distance of the melt and the pore size distribution index.
• the pore size distribution index decreases as the melt travel distance decreases. This is considered to be due to the fact that the coalescence of the pores was inhibited by the decrease in the fluidity of the melt.
• Table 1 shows the composition of the calcium fluoride-based melt when the mixing ratio of iron ore A was increased from 0% to 40%. From this, as the blending ratio of the iron ore A increases, it has been found that F e 2 0 3 3 ⁇ 4 of calcium ferrite in the melt is high summer.
• FIG. 7 (a) a sample in which limestone 12 of 8 mm ⁇ x 8 mm x 8 mm in height was placed on iron ore 11 of 16 mm ⁇ 16 mm ⁇ 10 mm in height was placed. , 130, and 2, respectively, and then cooled with water. After cooling, the central part of the sample was cut, and limestone 12 penetrated into 11 of the iron ore as shown in Fig. 7 (b). This cut surface was polished, and the cross section was photographed with a 10 ⁇ projector, and the fusion depth 14 shown in FIG. 7 (b) was obtained.
• Figure 8 shows the effect of the porosity of iron ore 11 on the melting depth 14 described above.
• Curves 21, 22 and 23 show the iron ores with porosity of 11.0%, 22.8% and 32.4%, respectively. As is evident from Fig. 8, as the porosity of the iron ore increases, the melting depth increases, indicating that the porosity of the iron ore has a large effect on the reaction rate of the iron ore.
• Fig. 10 shows the effect of the C a 0 Ban degree in the tablet 15 on the melting depth 14.
• the porosity (11.0%) and the retention time (4 minutes) of iron ore 11 are constant.
• the melting depth decreased as the 'Ca0 concentration in the tablet 15 decreased.
• the melting depth was measured by the method shown in Fig. 7, but as shown in Fig. 11, between the quicklime 12 and the iron ore 11, the returned ore 1 with the composition shown in Table 3 was obtained.
• An experiment in which 3 was sandwiched was performed.
• curve 24 shows the results of the experiment shown in FIG. 7 (a)
• curve 25 shows the results of the experiment shown in FIG.
• the depth of melting can be suppressed by sandwiching the returned ore 13 between the quicklime 12 and the iron ore 11. This is thought to be due to the fact that the melting reaction between iron ore and limestone is a reaction).
• the driving force is the concentration gradient of C a 0 in S. In other words, it suggests that the melting reaction of iron ore can be suppressed by coating iron ore with a return of Ca 0% lower than that of limestone in advance.
• the present invention has been made as a result of conducting research based on these experimental results.
• the fineness of the ore returned to cover iron ore A must be fine and should be 5 mm or less. This is because fine grains are more likely to adhere to the periphery of iron ore A, and preferably have a grain size of l mm or less.
• the amount of ore mixed with iron ore A shall be 0.2 to 1 part by weight based on 1 part by weight of iron ore A. If the amount is less than 0.2 parts by weight, the ore return is not enough to cover the surface of iron ore A. If the amount exceeds 1 part by weight, the effect is saturated and the balance is not appropriate due to the quantitative balance. by.
• the returned ore used was a returned ore having a CaO content of 8 to 15% by weight. If the Ca0 content is less than 8% by weight, the Ca0 content is too low, which hinders the melting reaction. If it exceeds 15% by weight, the melting reaction is suppressed. This is because the advantage of adding the return ore is lost.
• the raw material mainly composed of iron-containing raw material is called the main raw material
• the raw material added with limestone and silica stone is called the new raw material
• the raw material added with returned or coke is called the mixed raw material.
• Table 4 shows the chemical composition of iron ore A used in the experiment.
• the iron ore A is an iron ore from Australia with an arithmetic mean diameter of 3.1 mm and a water content of crystallization of 8.9%. This iron ore A is blended according to the flow shown in FIG. In FIG. 1, 1 indicates iron ore A, 2 indicates returned ore, 3 indicates the remaining sintering raw material, 4 indicates a dish granulator, and 5 indicates a drum mixer.
• iron ore A (iron ore 1) is blended with the main raw material.Returned ore 2 is added to 1/4 of iron ore A and mixed with iron ore A using a dish granulator 4. Pseudo-granulated. These pseudo particles were mixed in a drum mixer 5 with the remaining compounding raw materials 3 (iron ore containing low crystal water, limestone, silica stone, and coke) to obtain sintering raw materials.
• Table 5 shows the chemical composition of iron ore A and the returned ore used in the experiment.
• Iron Ore A is an iron ore from Australia with an arithmetic mean diameter of 3. Omm and a crystallization water content of 8.4%. This iron ore A is blended according to the flow of FIG.
• 1 indicates iron ore A
• 2 indicates returned ore
• 3 indicates the remaining sintering raw material
• 5 indicates a drum mixer
• 6 indicates iron ore A and a pre-granulated product of returned ore.
• Iron ore A (iron ore 1) was blended at 50% with the main raw material. Returned ore was added only to 1Z4 of iron ore A, and it was mixed with iron ore A using a drum mixer 5 and granulated. The iron ore A and the preliminarily returned ore granulated product 6 were once transported to the raw material yard, then received in a sintering plant, mixed with the remaining sintering raw material 3, and granulated to obtain a sintering raw material.
• the experiment was performed using an actual sintering machine, and the production rate, yield, and RI are shown in Fig. 10 in comparison with the conventional method. 0.

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• 1995
  • 1995-09-20 CN CN95191260A patent/CN1043246C/zh not_active Expired - Fee Related
  • 1995-09-20 KR KR1019960702564A patent/KR0173842B1/ko not_active IP Right Cessation
  • 1995-09-20 WO PCT/JP1995/001867 patent/WO1996009415A1/ja active Application Filing
  • 1995-09-20 AU AU35323/95A patent/AU688592B2/en not_active Ceased

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