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Cement clinker prepared from low-grade limestone and preparation method thereof

A low-grade limestone and cement clinker technology, applied in the field of cement clinker production technology, can solve the problem of large waste residue discharge

Active Publication Date: 2021-05-07
南阳中联水泥有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a cement clinker prepared by using low-grade limestone and its preparation method to solve the problem of large discharge of limestone mine waste residue

Method used

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  • Cement clinker prepared from low-grade limestone and preparation method thereof
  • Cement clinker prepared from low-grade limestone and preparation method thereof
  • Cement clinker prepared from low-grade limestone and preparation method thereof

Examples

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Effect test

Embodiment 1

[0038] A kind of cement clinker prepared by using low-grade limestone, including the following raw materials in percentage: 95% of low-grade high-silica limestone, 1% of sandstone, 2.5% of iron correction material, 1.5% of bauxite, and the CaO content of limestone is between At 41.5%-45%, the low-grade limestone has been homogenized, and the iron calibration materials include sulfuric acid slag, iron ore, and steel slag.

[0039] Elemental analysis results of low-grade limestone after homogenization in Table 1:

[0040] CaO / % SiO 2 / %

MgO / % 44.5％ 13％ 2.43％

[0041] In the cement clinker, Al 2 o 3 The content is 5.1%, Fe 2 o 3 The content is 3.6%, KH=0.89, SM=2.7, IM=1.6.

[0042] The homogenization method of above-mentioned low grade limestone, comprises the steps:

[0043] 1) Loading in the mine: Load the limestone from different mining faces into the truck separately, and use a belt such as figure 1 The loader with the grate grab shown perf...

Embodiment 2

[0066] A kind of cement clinker prepared by using low-grade limestone, including the following raw materials in percentage: 82% low-grade low-silica limestone, 7% sandstone, 5% iron correction material, 6% bauxite, and the CaO content of limestone is between At 41.5%-45%, the low-grade limestone has been homogenized, and the CaO content of the homogenized low-grade limestone is 44.3%, SiO 2 The iron content is 7%, and the MgO content is 1.02%. Among them, the iron calibration materials include sulfuric acid slag, iron ore, and steel slag.

[0067] Table 3 Elemental analysis results of low-grade limestone after homogenization:

[0068] CaO / % SiO 2 / %

MgO / % 44.3％ 7％ 1.02％

[0069] In the cement clinker, Al 2 o 3 The content is 4.9%, Fe 2 o 3 The content is 3.4%, KH=0.92, SM=2.4, IM=1.6.

[0070] The homogenization method of above-mentioned low grade limestone, comprises the steps:

[0071] 1) Loading in the mine: Load the limestone from differe...

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Abstract

The invention provides a cement clinker prepared from low-grade limestone and a preparation method thereof, and relates to the technical field of cement clinker production processes. The cement clinker comprises the following raw materials by weight: 80%-95% of low-grade limestone, 1%-10% of sandstone, 1%-5% of an iron correction material and 1%-8% of bauxite, wherein the CaO content of the limestone is 41.5%-45%; the low-grade limestone is subjected to homogenization treatment, the content of CaO in the homogenized low-grade limestone is not lower than 44.3%, the content of SiO2 is not higher than 13%, and the content of magnesium oxide is not higher than 3%; the cement clinker takes the low-grade limestone with the CaO content of 41.5-45%, sulfuric-acid slag, iron ore, steel slag, sandstone and bauxite as raw materials, so the limestone with the CaO content of lower than 45% produced by a mine is utilized, and the waste residue discharge amount of the mine is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of cement clinker production technology, in particular to a cement clinker prepared by using low-grade limestone and a preparation method thereof. Background technique [0002] Usually, the CaO content in the limestone used for the production of Portland cement should generally be controlled at about 47%-48%. applications are becoming more and more necessary. [0003] For a long time, limestone mines have become a bottleneck in production due to the constraints of resource conditions. Ore layers and interlayers appear alternately in mines, or ore layers and metamorphic interlayers are mixed together, and the stratification is irregular. The ore quality changes greatly. The high content of crystalline silicon leads to a huge amount of limestone mining and stripping, resulting in a large waste of resources; at the same time, it faces problems such as the waste residue cannot be stored in the open air, occupie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/02C04B7/38C04B7/43
CPCC04B7/02C04B7/38C04B7/43
Inventor 王李均曲国龙王辉别建敏甘爱均秦建廖明蕾郭永强
Owner 南阳中联水泥有限公司
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