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CN-121974582-A - Cement raw material pre-homogenizing method based on limestone

CN121974582ACN 121974582 ACN121974582 ACN 121974582ACN-121974582-A

Abstract

The invention relates to a cement raw material pre-homogenizing method based on limestone, which belongs to the technical field of cement production and comprises the following steps of S1, crushing limestone into particles, drying after impurity removal, detecting chemical components of limestone particles and recording, S2, storing the limestone into storage bins of corresponding grades according to the CaO content of the limestone in 3-5 grades, calculating the proportion of limestone and auxiliary materials of each grade, S3, conveying raw materials to a stacker according to the proportion, stacking the raw materials in different positions by adopting a mode of fan-shaped cloth and layering superposition, S4, reversely rotating and scraping the raw materials at different positions by a double-screw reclaimer, S5, conveying the raw materials obtained in S4 into a homogenizing warehouse, firstly mechanically stirring the raw materials for 10-15 min by compressed air at a rotating speed of 30-50 r/min, S6, detecting the homogenized raw materials in S5, entering a grinding procedure after being qualified, and returning the homogenized raw materials to the homogenizing warehouse for homogenization again if the raw materials are unqualified. The scheme solves the problem that the cement production quality is affected due to poor homogenization effect of the existing limestone processing cement raw materials.

Inventors

  • YAO HUANQING
  • WU LINYUAN
  • YANG JIANLI

Assignees

  • 铜仁西南水泥有限公司

Dates

Publication Date
20260505
Application Date
20251226

Claims (5)

  1. 1. A method for pre-homogenizing a raw cement material based on limestone, comprising the steps of: S1, crushing a limestone raw material into particles with the particle size of 5-50 mm, drying the particles until the water content is less than or equal to 1.5% after impurity removal, and detecting and recording chemical components of the limestone particles; S2, according to the CaO content in the limestone, dividing the limestone into 3-5 grades, storing the limestone into corresponding grade storage bins, and calculating the proportion of each grade of limestone and auxiliary materials through a computer; S3, conveying raw materials to a stacker according to a proportion, stacking in a mode of sector-shaped cloth and layered superposition, wherein the thickness of the stacking layer is 20-30 cm, and the height is lower than 15m; s4, scraping raw materials at different positions of a material pile through reverse rotation of a double-screw material taking machine, wherein the material taking speed is 0.5-1.2 m 3 /min; s5, feeding the raw materials obtained in the step S4 into a homogenizing warehouse, firstly fluidizing and stirring for 15-25 min by using compressed air with the pressure of 0.3-0.5 MPa, and then mechanically stirring for 10-15 min at the rotating speed of 30-50 r/min until the component deviation is less than or equal to +/-0.5%; s6, detecting the homogenized raw materials in the step S5, entering a grinding process after passing the raw materials, and returning to a homogenizing warehouse for re-homogenizing if the raw materials are not passing the raw materials.
  2. 2. A method for pre-homogenizing cement raw materials based on limestone as claimed in claim 1, wherein in the step S1, two-stage crushing is adopted, wherein the first stage adopts a jaw crusher to crush the limestone to less than or equal to 100mm, and the second stage adopts an impact crusher to crush the limestone to 5-50mm.
  3. 3. A method for pre-homogenizing cement raw materials based on limestone as claimed in claim 2, wherein the width of the cloth of the stacker in step S3 is adjusted to 3-8m.
  4. 4. The method for pre-homogenizing cement raw materials based on limestone, as claimed in claim 3, wherein in step S5, air inlets of the air flow stirring device for fluidizing and stirring compressed air are uniformly distributed at the bottom of the homogenizing warehouse, and the air inlet direction forms an included angle of 30-45 degrees with the bottom of the homogenizing warehouse.
  5. 5. The method of pre-homogenizing cement raw material based on limestone as claimed in claim 4, wherein the stirring blade of the mechanical stirring device in the step S5 is of a propeller type structure, and the distance between the stirring blade and the bottom of the warehouse body is 50-80cm.

Description

Cement raw material pre-homogenizing method based on limestone Technical Field The invention relates to the technical field of cement production, in particular to a limestone-based cement raw material pre-homogenization method. Background The degree of homogenization of the cement raw meal is one of the key factors affecting the quality of the cement clinker, the calcination efficiency and the energy consumption. Limestone is used as a main raw material (the proportion of the limestone is generally more than 70%) of cement raw materials, and fluctuation of chemical components (CaO content) of the limestone can directly lead to unbalance of raw material components, so that problems of underburn, overburning and the like occur in the clinker calcination process, the strength of the clinker is reduced, and meanwhile, the energy consumption and pollutant emission are increased. The existing cement raw meal pre-homogenization technology mainly comprises two types of stock yard pre-homogenization and in-warehouse pre-homogenization. The stock yard pre-homogenization is carried out by adopting a long stock stacker to perform layered stock and transverse material taking, component mixing is realized through multi-layer superposition of materials, and the stock yard pre-homogenization is carried out by utilizing a stirring device or air flow stirring to realize material homogenization. However, the prior art has the defects that firstly, aiming at the defect of insufficient characteristic suitability of limestone raw materials, the segregation phenomenon is easily caused in the stacking process due to large grading difference of limestone particles and fluctuation of water content, the homogenization effect is poor, secondly, the material conveying and stirring energy consumption in the homogenization process is high, dust pollution is easily generated, thirdly, the homogenization parameters are fixedly arranged, dynamic adjustment cannot be carried out according to real-time detection of fluctuation of limestone components, the homogenization precision is unstable, and the production requirement of high-quality cement is difficult to meet. Therefore, a cement raw material pre-homogenizing method which is adaptive to the characteristics of limestone, low in energy consumption, high in homogenizing precision and capable of being dynamically regulated and controlled is developed, so that the cement production quality is improved, and the production cost is reduced. Disclosure of Invention The invention aims to provide a cement raw material pre-homogenizing method based on limestone, which aims to solve the problem that the existing limestone processing cement raw material has poor homogenizing effect and affects cement production quality. In order to achieve the aim, the invention adopts the following technical scheme that the cement raw material pre-homogenizing method based on limestone comprises the following steps: S1, crushing a limestone raw material into particles with the particle size of 5-50 mm, drying the particles until the water content is less than or equal to 1.5% after impurity removal, and detecting and recording chemical components of the limestone particles; S2, according to the CaO content in the limestone, dividing the limestone into 3-5 grades, storing the limestone into corresponding grade storage bins, and calculating the proportion of each grade of limestone and auxiliary materials through a computer; S3, conveying raw materials to a stacker according to a proportion, stacking in a mode of sector-shaped cloth and layered superposition, wherein the thickness of the stacking layer is 20-30 cm, and the height is lower than 15m; s4, scraping raw materials at different positions of a material pile through reverse rotation of a double-screw material taking machine, wherein the material taking speed is 0.5-1.2 m 3/min; s5, feeding the raw materials obtained in the step S4 into a homogenizing warehouse, firstly fluidizing and stirring for 15-25 min by using compressed air with the pressure of 0.3-0.5 MPa, and then mechanically stirring for 10-15 min at the rotating speed of 30-50 r/min until the component deviation is less than or equal to +/-0.5%; s6, detecting the homogenized raw materials in the step S5, entering a grinding process after passing the raw materials, and returning to a homogenizing warehouse for re-homogenizing if the raw materials are not passing the raw materials. Preferably, as an improvement, when the limestone is crushed in the step S1, two-stage crushing is adopted, wherein the first stage adopts a jaw crusher to crush the limestone to be less than or equal to 100mm, and the second stage adopts a counterattack crusher to crush the limestone to be 5-50mm. Preferably, as a modification, the width adjustment range of the stacker in step S3 is 3-8m. Preferably, as an improvement, the air inlets of the air flow stirring device for fluidizing and stirring the compressed air in the ste