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Cement preparation method

A cement preparation and cement technology, which is applied in the direction of cement production, etc., can solve the problems of waste of coal and electric energy consumption, etc., and achieve the effects of reducing the consumption ratio of clinker, increasing the output per unit hour, and increasing the stacking density

Inactive Publication Date: 2020-03-27
SICHUAN YADONG CEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The kiln dust and ultrafine powder in the raw meal vertical mill system are used as raw meal directly into the raw meal storehouse for use as raw meal. The main raw material in the raw meal is limestone, and part of the ultrafine limestone in the kiln dust and raw meal vertical mill system The specific surface area of ​​powder is much higher than that of ordinary raw meal and cement. If it is used as raw meal in the kiln and then ground into cement, it will cause waste of coal and electricity consumption in the process of calcination and cement grinding.

Method used

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Effect test

Embodiment 1

[0017] In this embodiment, the main ingredient in the raw meal is limestone, and the specific surface area of ​​some ultra-fine limestone powder in the kiln dust and raw meal vertical mill system can reach 1000-1200m 2 / kg, far exceeding the specific surface area of ​​general raw meal and cement. If raw meal is sintered into the kiln and then ground into cement, it will cause waste of coal and electricity consumption in the process of calcination and cement grinding.

[0018] Applying this ultra-fine powder to cement mills instead of limestone as a mixed material can make full use of the characteristics of ultra-fine powder, increase the bulk density of cement particles, make cement particle distribution closer to the particle size distribution requirement of Fuller curve, and increase cement strength . When the ultra-fine powder is mixed into the cement mill as a mixed material, it does not need to be ground again, and can be directly selected as the finished product by the class...

Embodiment 2

[0020] The invention discloses a method for preparing cement by using a mixture of kiln dust and a vertical mill superfine limestone powder as the mixture.

[0021] The chemical composition (mass ratio) of the mixture of kiln dust and vertical mill ultrafine limestone powder is shown in the following table

[0022]

[0023] Table 1

[0024] The physical properties of the mixture of kiln dust and vertical mill ultrafine limestone powder are shown in the following table

[0025]

[0026] Table 2

[0027] From the inspection data, the particle size distribution of the mixture of kiln dust and vertical mill ultrafine limestone powder The content of particles 2 / kg, so it can be applied to cement mills instead of limestone as a mixed material, using the characteristics of ultra-fine powder to increase the output per mill, increase the bulk density of finished cement particles, and increase the strength of cement.

Embodiment 3

[0029] In this embodiment, after the superfine powder is incorporated, the cement strength can be significantly increased under the premise of the clinker content unchanged, so the clinker consumption ratio in the cement can be reduced to a certain extent. Taking the clinker small grinding cement as the benchmark, the cement strength test situation after adding ultra-fine powder is shown in the following table:

[0030]

[0031] table 3

[0032] From the comparative test situation, after adding kiln dust and ultra-fine limestone powder, under the premise that the clinker mixing ratio is reduced by 5%, the compressive strength of cement at 3 days and 28 days only decreases by 0.5-1.5Mpa, which is still To maintain a higher late strength, it is proved that the incorporation of kiln dust and ultrafine limestone powder can effectively reduce the proportion of clinker consumption in cement.

[0033] Because the mixture of kiln dust and vertical mill superfine limestone powder is very fin...

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Abstract

The invention discloses a cement preparation method. Superfine limestone powder in a raw material vertical mill system and kiln dust in the production process is taken as a mixed material to be applied to a cement mill to produce cement. When the superfine powder is applied to the cement mill to replace limestone to serve as the mixed material, the characteristics of the superfine powder can be fully utilized, the stacking density of cement particles is increased, the distribution of the cement particles is closer to the particle size distribution requirement of a Fuller curve and the cement strength is improved. When the superfine powder is used as the mixed material to be added into the cement mill, the superfine powder can be directly used as a finished product to be selected by a powder selecting machine without being ground again so that the machine-hour yield of the cement mill is increased, the 3-day and 28-day strength of cement is also increased, the effect of reducing the clinker consumption ratio in the cement can be achieved and the production cost is saved.

Description

Technical field [0001] The invention belongs to the technical field of cement production, and in particular relates to a cement preparation method. Background technique [0002] The main ingredients of the cement formula prepared by the cement mill are clinker, gypsum, slag, limestone, etc. The cement grinding section needs to mix and grind the above materials until the specific surface area reaches 330-350m 2 / kg, so a lot of electricity is consumed during the grinding process. The ultra-fine powder in the kiln dust and raw meal vertical mill system is used as raw meal directly into the raw meal storehouse as raw meal. The main raw material in the raw meal is limestone, and part of the ultra-fine limestone in the kiln dust and raw meal vertical mill system The specific surface area of ​​powder far exceeds that of general raw meal and cement. If raw meal is sintered into the kiln and then ground into cement, it will cause waste of coal and electricity consumption during the calci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/02C04B7/26C04B7/19C04B7/52
CPCC04B7/02C04B7/19C04B7/26C04B7/52Y02P40/10
Inventor 高小田
Owner SICHUAN YADONG CEMENT CO LTD
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