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CN-117887958-B - Method for reducing granularity segregation by multi-section tiling of mixed materials

CN117887958BCN 117887958 BCN117887958 BCN 117887958BCN-117887958-B

Abstract

The invention belongs to the technical field of sintering and mixing ingredients, and relates to a method for reducing granularity segregation by multi-section tiling of a mixing material, wherein each material is divided into 3-4 sections according to the granularity according to the proportion required by production, and the material with the largest granularity and the most easily segregated material is added in the first section; the second section is added with dust with fine granularity and large dust emission, the third and fourth sections are added with material seeds with uniform granularity, and the head and tail cutting operation is carried out before the material is taken, and the mixture in the area returns to the top of the new pile. The invention adopts sectional tiling, solves the problem of dust scattering by adding the dust removal ash in the second section while solving the particle size segregation. Every feed bin all can alternate the use, has solved feed bin quantity problem. Meanwhile, small material seeds can be prepared at a certain stage, so that the recycling of iron-containing resources is realized.

Inventors

  • GAO WENSHENG
  • ZHANG SHOULIANG
  • YANG LEI
  • YAO FUQUAN
  • HE JIANFEI
  • XIN JIAN
  • WANG SHIXU
  • GAO HONGLEI

Assignees

  • 山东钢铁集团日照有限公司

Dates

Publication Date
20260505
Application Date
20240304

Claims (6)

  1. 1. A method for reducing grain size segregation by multi-section tiling of mixed materials is characterized in that each material is divided into 3-4 sections according to the grain size according to the proportion required by production, the first section is provided with the material with the largest grain size and the most easy segregation, the second section is provided with the dust removal ash with fine grain size and large dust emission, the third section and the fourth section are provided with the material with uniform grain size, and the head and tail cutting operation is carried out before material taking, and the mixed material in the area returns to the top of a new pile.
  2. 2. The method for reducing grain size segregation by multi-stage tiling of mixed materials according to claim 1, wherein each material is classified into five grades of >8mm, 5-8mm, 3-5mm, 1-3mm and <1mm according to grain size.
  3. 3. The method for reducing grain size segregation by multi-section tiling of the mixed materials according to claim 1 or 2, which comprises the following specific steps: (1) After the new stack is opened for tons, the first section has poor proportioning and charging performance, the granularity is more than 8mm and more than 30 percent, the large-size fraction is more than the large-size fraction, the material flow is controlled to be less than or equal to 800t/h, and the number of layers is controlled to be 100-120 layers; (2) The second section is added with fine granularity, fine granularity and light weight carbon-containing solid waste with the proportion of <1mm more than 20%, the material flow is controlled to 1050-1200t/h, and the layer number is controlled to 15-20; (3) The third section is added with materials with uniform granularity and better material property, the 1-8mm of the materials accounts for more than 85 percent, the material flow is controlled to 1500-1600t/h, and the number of layers is controlled to 190-220 layers; (4) Head and tail cutting is carried out on the head and tail materials; (5) Head material disposal, namely after the closing of the pile, the reclaimer starts to take the head material, starts from the bottommost edge of the head of the pile, takes 17-19m towards the tail direction, at the moment, the material tip advances forward for 3.9-5.2m, and the head material returns to a new pile of the pile; (6) The tail material treatment is divided into two parts, wherein one part is transition material and the other part is dead material pile, the extreme edge of the tail of the material pile is fixed to be dead material pile in the head direction of 16.5-18.5m, the pile is not fixed, the functions of retaining wall and reducing segregation of the tail are achieved, and the area of 4-8m and 2000-4000 tons of transition material in the head direction is returned to the top of a new pile.
  4. 4. The method for reducing grain size segregation by multi-stage tiling of the mixed materials according to claim 3, wherein the carbon-containing solid waste in the step (2) is one or a mixture of more of coking dust, sintering dust, blast furnace cyclone dust and steelmaking fine dust.
  5. 5. A method for reducing grain size segregation by multi-stage tiling of a blend according to claim 3, wherein when the grain size of 3-5mm is more than 50%, the fourth stage of blending is added to blend the most uniform grain size.
  6. 6. A method of reducing particle size segregation in a multi-stage tiling of blend stock as claimed in claim 3 wherein each stage of stock requires a uniform throughout addition of each stock and a time delay operation is employed to ensure alignment of the same stock type "joints" when the stock bins are switched to each other, time delay = two bin distance/belt speed.

Description

Method for reducing granularity segregation by multi-section tiling of mixed materials Technical Field The invention belongs to the technical field of sintering mixing ingredients, and particularly relates to a method for reducing granularity segregation by multi-section tiling of mixing ingredients. Background The sinter production is one of the important procedures of ferrous metallurgy production, and whether the proportion of the sinter mixture is reasonable or not affects the yield and quality of the sinter, and has important influence on the final cost of the sinter. In order to realize uniform mixing and adding of mixed materials, a material distributing mode of a material bin is generally adopted, single materials are respectively poured into different material bins, the blanking amount is set according to the proportion, and each material is ensured to be added simultaneously in the material distributing process. However, due to the shortage of ore resources, the amount of iron ore is large and the variety is great, so that the number of required bins is continuously increased. And the granularity difference among different materials is larger, the granularity segregation is easily caused by the simultaneous participation of each material in the batching, and the materials with the granularity of more than 8mm are distributed at the edge of a material pile. Meanwhile, along with recycling of carbon-containing solid waste, various fly ashes participate in mixing and adding, and because the fly ashes are fine in granularity, fly ash is diffused in the tiling and direct taking processes, and the environment-friendly requirement cannot be met. Currently, in order to improve uniformity of mixed materials, a plurality of enterprises reduce granularity segregation, and a multi-span multi-pile layout is adopted. The occupied land is large, and the reconstructed steel plant cannot meet the land requirement due to compact layout and scarce land resources. In addition, the solid wastes in factories such as iron scales cannot be added in the whole process due to the small quantity. The Chinese patent application CN 113388733A discloses a fluctuation control method for ingredients of a mixed material, wherein the mixed material is divided into 5 material layer stable regions, a hierarchical material quantity proportion method is adopted for stacking, and the mixed material is only subjected to material flow control in the material mixing process, so that the uniformity of the mixed material is not increased, the material tail is not eaten, and the ore resource waste is caused. The TFe mixing and blending technology research of SiO 2 and the like of Shoudu Iron and Steel Co Beijing Tang et al (sintered pellets, pages 35-39 in period 4 of 2017) adopts a BLOCK material distribution method, and the method has too many limiting conditions on material types, proportions and the like, and the minimum proportion is more than 1 percent, so that small material seed blending cannot be satisfied. Disclosure of Invention Aiming at the problems of large number of required bins, large edge size distribution, large occupied area of a material field, serious dust and flying dust, large difficulty in adding small material seeds and the like in the existing method for reducing the granularity segregation of the mixed material, the invention aims to provide a method for reducing the granularity segregation by multi-section tiling of the mixed material. The invention solves the technical problems by adopting the technical scheme that the method for reducing the granularity segregation by multi-section tiling of the mixed material comprises the steps of dividing each material into 3-4 sections according to the granularity according to the proportion required by production, adding the material with the largest granularity and the most easily segregated material in the first section, adding the dust ash with fine granularity and large dust emission in the second section, adding the material with uniform granularity in the third section and the fourth section, and carrying out head and tail cutting operation before material taking, wherein the mixed material in the region returns to the top of a new pile. Further, the individual materials were classified into five grades of >8mm, 5-8mm, 3-5mm, 1-3mm, <1mm by particle size. Further, the specific steps are as follows: (1) After the new stack is opened for tons, the first section has poor proportioning and charging performance, the granularity is more than 8mm and more than 30 percent, the large-size fraction is more than the large-size fraction, the material flow is controlled to be less than or equal to 800t/h, and the number of layers is controlled to be 100-120 layers; (2) The second section is added with fine granularity, fine granularity and light weight carbon-containing solid waste with the proportion of <1mm more than 20%, the material flow is controlled to 1050-1200t/h, and the