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CN-121994577-A - Iron-containing mineral sinter sample, preparation method thereof and evaluation method of mineral phase formation performance

CN121994577ACN 121994577 ACN121994577 ACN 121994577ACN-121994577-A

Abstract

The application discloses an iron-containing mineral sinter sample, a preparation method thereof and an evaluation method of mineral phase formation performance. The preparation method comprises the steps of providing an iron-containing raw material to be detected, a quicklime powder sample, a dolomite powder sample and a target ore preparation structure, calculating the proportion of the iron-containing raw material to be detected, the quicklime powder sample and the dolomite powder sample in the target ore preparation powder according to the adhering powder proportion of the target ore preparation structure, preparing and mixing the proportions to obtain the target ore preparation powder, and sequentially carrying out pressing treatment and sintering treatment on the target ore preparation powder to obtain an iron-containing mineral sinter sample. The preparation method disclosed by the application can be closer to the conditions of adhering powder sintering to generate mineral phases in actual production, and can cover actual participation factors in production more comprehensively, so that the mineral phase generation performance of the iron ore powder can be judged more accurately.

Inventors

  • XU HUI
  • DENG BIRONG
  • LI LAISHENG
  • YANG XIDUAN
  • PENG YANG
  • LIU WENXUAN

Assignees

  • 湖南华菱涟源钢铁有限公司

Dates

Publication Date
20260508
Application Date
20260121

Claims (10)

  1. 1. A method for preparing a sample of iron-bearing mineral agglomerate, comprising: providing an iron-containing raw material to be detected, a quicklime powder sample, a dolomite powder sample and a target ore blending structure; According to the proportion of the adhesive powder of the target ore blending structure, calculating to obtain the proportion of the iron-containing raw material to be detected, the quicklime powder sample and the dolomite powder sample in the target ore blending powder, and mixing according to the proportion to obtain the target ore blending powder; and the target ore powder is subjected to pressing treatment and sintering treatment in sequence to obtain the iron-containing mineral sintered ore sample.
  2. 2. The preparation method according to claim 1, wherein the quicklime powder sample comprises 80% -85% of CaO, 1% -2% of SiO 2 and 1.5% -2.0% of MgO based on the total mass of the quicklime powder sample, and the quicklime powder sample has a full size fraction.
  3. 3. The method of claim 1, wherein the dolomite powder sample comprises 30% -35% CaO and 15% -25% MgO, based on the total mass of the dolomite powder sample, the dolomite powder sample having a particle size of full size fraction.
  4. 4. The method according to claim 1, wherein the step of calculating the proportions of the iron-containing raw material to be measured, the quicklime powder sample and the dolomite powder sample in the target ore powder according to the proportion of the adhesive powder of the target ore powder structure and mixing the proportions to obtain the target ore powder comprises the steps of: Determining the adhesive powder proportion of the iron-containing raw material to be detected according to the adhesive powder proportion of the target iron-containing ore blending structure; According to the adhesive powder proportion of the target iron-containing ore blending structure, the binary alkalinity and magnesium element content of the target iron-containing ore blending structure, the quicklime proportion and the dolomite proportion, the proportion of the quicklime and the dolomite in the target ore blending powder is determined, and the target ore blending powder is obtained by mixing the quicklime and the dolomite in proportion, optionally, the binary alkalinity of the target iron-containing ore blending structure is 1.85-2.05, and the magnesium element mass percentage of the target iron-containing ore blending structure is 1.7% -1.9%.
  5. 5. The preparation method of the iron-containing raw material powder according to the preparation method of the iron-containing raw material powder is characterized in that according to the adhering powder proportion of the target ore preparation structure, the proportion of the iron-containing raw material to be detected, the quicklime powder sample and the dolomite powder sample in the target ore preparation powder is calculated, and the steps of preparing and mixing the iron-containing raw material, the quicklime powder sample and the dolomite powder sample according to the proportion to obtain the target ore preparation powder comprise the steps of adding water into a proportion of quicklime to digest slaked lime, and mixing the quicklime with a proportion of the iron-containing raw material to be detected and the dolomite powder sample to obtain the target ore preparation powder.
  6. 6. The method according to claim 1, wherein the step of obtaining the iron-containing mineral sinter sample from the target ore powder by sequentially subjecting the target ore powder to a pressing treatment and a sintering treatment comprises: The target powder is subjected to constant pressure for 3-5min at 400-800N to obtain a cake-shaped sample; and sintering the cake-shaped sample at the constant temperature of 1250-1280 ℃ for 3-5min to obtain the iron-containing mineral sintering ore sample.
  7. 7. An iron-bearing mineral sinter sample prepared by the method of any one of claims 1 to 6.
  8. 8. A method for evaluating mineral phase formation properties of an iron-containing mineral, comprising: providing the iron-bearing mineral sinter sample prepared by the preparation method of any one of claims 1 to 6; preparing the iron-containing mineral sinter sample into a light sheet to be tested; and carrying out microstructure analysis on the light sheet to be tested to evaluate the mineral phase generation performance of the iron-containing mineral.
  9. 9. The method of evaluating according to claim 8, wherein the step of preparing the iron-bearing mineral sinter sample into a sheet to be tested comprises: Embedding the iron-containing mineral sinter sample, performing rough polishing by using abrasive paper with 180 meshes, grinding an observation surface, performing rough polishing by using abrasive paper with 400 meshes, grinding the observation surface to be flat, and performing fine polishing by using abrasive paper with 800 meshes to 1200 meshes for 10min to 20min respectively to obtain a ground sample; Polishing the polished sample, adding water and Al 2 O 3 suspension as medium, polishing for 5-10min to make the surface of the light sheet bright, and obtaining the light sheet to be tested.
  10. 10. The method of evaluating according to claim 8, wherein the step of performing a microstructural analysis on the optical sheet to be tested to evaluate mineral phase formation properties of the iron-containing mineral comprises: Observing the pore structure and crack distribution of the iron-bearing mineral sinter sample under the condition of 50-100 times of magnification; Under the condition of 200-500 times of magnification, confirming the mineral composition and the embedding characteristic of the mineral composition through the chemical components, the mineral reflection color and the distribution area of the iron-containing mineral sinter sample; The mineral phase formation properties of the iron-containing minerals were evaluated based on the mineral reflection color, morphological characteristics and distribution area of each mineral phase.

Description

Iron-containing mineral sinter sample, preparation method thereof and evaluation method of mineral phase formation performance Technical Field The application belongs to the technical field of iron ore smelting, and particularly relates to an iron-containing mineral agglomerate sample, a preparation method thereof and an evaluation method of mineral phase formation performance. Background In the existing method for detecting the sintering performance of the iron-containing raw material, on one hand, the iron ore is ground and then subjected to experiments, so that the influence of the original size composition of the iron ore on the sintering process is ignored, and after the iron ore is ground, the contact area with CaO and MgO fluxes (such as slaked lime powder and dolomite powder) is increased, so that the composition structure of the sintered ore is influenced. On the other hand, iron ore is provided with CaO, mgO and SiO 2, so that the quantity of quicklime added by different ores is different, the flux proportion in actual production is determined by all mixed materials and sinter ingredients, the granularity composition and ingredients of raw materials can influence the flux proportion in a melting zone, and the existing method with equal binary alkalinity is adopted, so that the flux proportion in the melting zone in actual industrial production is limited. Thirdly, the calcium ferrite generating capacity is detected by only considering the binary alkalinity, namely the reaction of the CaO flux and the iron ore powder, while in practice, the MgO flux has an important influence on the generation of mineral phases, and the mineral phase composition of the sinter is a key factor affecting the performance of the sinter. Disclosure of Invention The embodiment of the application provides an iron-containing mineral sintered ore sample, a preparation method thereof and an evaluation method of mineral phase formation performance, which can be closer to the conditions of adhering powder sintering to form mineral phases in actual production, cover actual participation factors in production more comprehensively and judge the mineral phase formation performance of iron ore powder more accurately. According to the first aspect, the embodiment of the application provides a preparation method of an iron-containing mineral sintered ore sample, which comprises the steps of providing an iron-containing raw material to be detected, a quicklime powder sample, a dolomite powder sample and a target ore preparation structure, calculating the proportion of the iron-containing raw material to be detected, the quicklime powder sample and the dolomite powder sample in the target ore preparation structure according to the adhesion powder proportion of the target ore preparation structure, preparing and mixing the proportions to obtain the target ore preparation powder, and sequentially carrying out pressing treatment and sintering treatment on the target ore preparation powder to obtain the iron-containing mineral sintered ore sample. In some embodiments, the quicklime powder sample comprises 80% -85% CaO, 1% -2% SiO 2, and 1.5% -2.0% MgO, based on the total mass of the quicklime powder sample, with the quicklime powder sample having a particle size of full size fraction. In some embodiments, the dolomite powder sample comprises 30% -35% CaO and 15% -25% MgO, based on the total mass of the dolomite powder sample, the dolomite powder sample having a particle size of full size fraction. In some specific embodiments, the steps of calculating the proportion of the iron-containing raw material to be detected, the quicklime powder sample and the dolomite powder sample in the target ore preparation powder according to the proportion of the adhesive powder of the target iron-containing ore preparation structure, and mixing the proportions according to the proportion of the adhesive powder of the target iron-containing ore preparation structure to obtain the target ore preparation powder comprise the steps of determining the proportion of the adhesive powder of the iron-containing raw material to be detected according to the proportion of the adhesive powder of the target iron-containing ore preparation structure, determining the proportion of the quicklime and the dolomite in the target ore preparation powder according to the proportion of the adhesive powder of the target iron-containing ore preparation structure, and optionally, mixing the quicklime and the dolomite in the target ore preparation powder according to the proportion to obtain the target ore preparation powder, wherein the binary alkalinity of the target iron-containing ore preparation structure is 1.85-2.05, and the magnesium content of the target iron-containing ore preparation structure is 1.7% -1.9%. In some specific embodiments, according to the proportion of the adhesion powder of the target ore blending structure, the proportion of the iron-containing raw material