Method for preparing cement clinker by utilizing high-magnesium and high-alkali limestone

A technology of cement clinker and cement raw material, which is applied in the direction of cement production, etc., which can solve the problems of limited utilization of high-alkali limestone resources, reduction of flexural strength and compressive strength, poor stability of cement cement, etc., and achieve reduction of free MgO content , Promote the perfection of crystallization and increase the effect of solid solution

Active Publication Date: 2020-11-17
保定太行和益环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But with the increase of alkali content will make C 3 S is difficult to form, and the free calcium oxide of clinker increases, which increases the water demand of cement, sets too fast, significantly reduces the flexural strength and compressive strength, and even causes poor stability of cement cement, which makes the utilization of a large amount of high-alkali limestone resources restricted. restricted

Method used

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  • Method for preparing cement clinker by utilizing high-magnesium and high-alkali limestone
  • Method for preparing cement clinker by utilizing high-magnesium and high-alkali limestone
  • Method for preparing cement clinker by utilizing high-magnesium and high-alkali limestone

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Embodiment 1

[0032] A method for preparing cement clinker, comprising:

[0033] Table 1 raw material chemical composition (wt%)

[0034]

[0035]

[0036] Table 2 Cement Raw Meal Proportion (wt%)

[0037]

[0038] Table 3 The chemical composition (wt%) and three rate values ​​of the designed clinker

[0039]

[0040] Limestone and sandstone are cleaned and dried, then broken and preliminarily ground with a ball mill, and finally ground with a planetary mill until all of them pass through a 75μm square hole sieve. The slag and coal ash are broken and preliminarily ground with a ball mill, and then ground with a planetary mill until they all pass through a 75μm sieve.

[0041] The various raw material powders after sieving were dried in an oven at 105°C for 12 hours to remove the moisture contained therein, and then the ingredients were prepared according to Table 2. Put the prepared raw material into the planetary mill and use the wet grinding method to homogenize the raw mat...

Embodiment 2

[0044] The addition of potassium humate in the composite mineralizer used in the cement raw meal is 0.10wt%, and the remainder is completely consistent with embodiment 1.

Embodiment 3

[0046]The addition of potassium humate in the composite mineralizer used in the cement raw meal is 0.21wt%, and the remainder is completely consistent with embodiment 1.

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Abstract

The invention provides a method for preparing cement clinker from high-magnesium and high-alkali limestone, and belongs to the technical field of cement generation. The cement clinker is prepared fromthe following raw materials: high-magnesium and high-alkali limestone series, high-grade limestone, sandstone, slag and bituminous coal ash; in addition, a composite mineralizing agent, comprising afluorine-sulfur mineralizing agent and potassium humate, is also added. The method for preparing the cement clinker from the high-magnesium and high-alkali limestone has the advantages of high efficiency, environmental protection, low cost and high quality.

Description

technical field [0001] The invention belongs to the technical field of cement generation, and in particular relates to a method for preparing cement clinker by using high-magnesium and high-alkali limestone. Background technique [0002] During the calcination of Portland cement clinker, due to MgO and SiO 2 and Fe 2 o 3 The chemical affinity of MgO is very small, therefore, generally MgO does not participate in the chemical reaction during the formation of clinker minerals. Studies have shown that there are three main forms of MgO in clinker: (1) dissolved in C 3 Form solid solution in minerals such as S; (2) Partially dissolve in the glass body; (3) Exist in the form of periclase. The former two forms of MgO have basically no damage to the hardened cement paste, but when it exists in the form of periclase, the hydration rate of MgO is slow and the volume expansion of magnesium hydroxide generated by hydration is 148%, which may cause cement Poor slurry stability. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/42C04B7/26C04B7/38C04B7/44
CPCC04B7/42C04B7/26C04B7/44C04B7/38Y02P40/10
Inventor 陈敬王营和刘银海王海雨贾琦冀炜
Owner 保定太行和益环保科技有限公司
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