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Modified portland cement clinker and preparation method thereof

A Portland cement and cement clinker technology, applied in cement production and other directions, can solve the problems of limited application scope and scale, low comprehensive utilization rate, waste of land resources, etc. Fast hydration effect

Inactive Publication Date: 2018-01-19
GEZHOUBA SONGZI CEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Harmful impurities in industrial gypsum make it inferior to natural gypsum, limiting its range and scale of application
Industrial gypsum is mainly used in gypsum building materials, chemical fertilizer industry, ceram

Method used

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  • Modified portland cement clinker and preparation method thereof
  • Modified portland cement clinker and preparation method thereof
  • Modified portland cement clinker and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Using the preparation method of modified Portland cement clinker, the test was carried out in the new dry method precalcining kiln of Gezhouba Jingmen Cement Co., Ltd. The specific operation steps are as follows:

[0026] (1) Limestone is crushed to a 70mm square hole sieve residue <10%, pre-homogenized and stored in the limestone shed, shale, kaolin, sulfuric acid slag and other raw materials are homogenized and stored in the joint storage.

[0027] (2) Mix 82% limestone, 8% shale, 8% kaolin and 2% iron powder evenly according to the ratio of mass fraction, among which control limestone CaO is 51-52%, shale SiO 2 68-70%, kaolin Al 2 o 3 16-20%, sulfuric acid slag Fe 2 o 3 65-70%.

[0028] (3) Send the above mixed material into the vertical mill for drying and grinding, screen the finished product with moisture content≤1.0wt% and 20mm square hole sieve ≤2.0wt% as cement raw meal, and send it into raw meal Chemical library storage.

[0029] (4) Feed the homogenized...

Embodiment 2

[0039] Using the preparation method of modified Portland cement clinker, the test was carried out in the new dry method precalcining kiln of Gezhouba Jingmen Cement Co., Ltd. The specific operation steps are as follows:

[0040] (1) Limestone is crushed to 70mm square hole sieve residue <10%, pre-homogenized and stored in limestone shed, shale, kaolin, sulfuric acid slag, phosphogypsum and other raw materials are homogenized and stored in joint storage.

[0041] (2) Mix 78% limestone, 10% shale, 8% kaolin, 1% iron powder and 3% phosphogypsum according to the proportion of mass fraction, among which control limestone CaO is 51-52%, shale SiO 2 68-70%, kaolin Al 2 o 3 16-20%, sulfuric acid slag Fe 2 o 3 65-70%, phosphogypsum SO 3 35-42%.

[0042] (3) Send the above mixed material into the vertical mill for drying and grinding, screen the finished product with moisture content≤1.0wt% and 20mm square hole sieve ≤2.0wt% as cement raw meal, and send it into raw meal Chemical l...

Embodiment 3

[0055] Using the preparation method of modified Portland cement clinker, the test was carried out in the new dry method precalcining kiln of Gezhouba Jingmen Cement Co., Ltd. The specific operation steps are as follows:

[0056] (1) Limestone is crushed to 70mm square hole sieve residue <10%, pre-homogenized and stored in limestone shed, shale, kaolin, sulfuric acid slag, phosphogypsum and other raw materials are homogenized and stored in joint storage.

[0057] (2) Mix 75% limestone, 8% shale, 10% kaolin, 2% iron powder and 5% desulfurized gypsum according to the proportion of mass fraction, among which control limestone CaO is 51-52%, shale SiO 2 68-70%, kaolin Al 2 o 3 16-20%, sulfuric acid slag Fe 2 o 3 65-70%, phosphogypsum SO 3 40-45%.

[0058] (3) Send the above mixed material into the vertical mill for drying and grinding, screen the finished product with moisture content≤1.0wt% and 20mm square hole sieve ≤2.0wt% as cement raw meal, and send it into raw meal Chem...

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Abstract

The invention relates to modified portland cement clinker and a preparation method thereof. The preparation method comprises the following steps: crushing, homogenization, compounding, drying and grinding are performed to prepare cement raw meal; feeding the cement raw meal into a predecomposition kiln; performing pre-heating, decomposition and high-temperature incineration; and performing quick cooling by a grate cooler to prepare modified portland cement clinker, wherein the modified portland cement clinker comprises the main mineral compositions of C3S, C2S, C4AF and C4A3S, and industrial gypsum replaces part of limestone in the raw meal compounding process. By adoption of the technical scheme, the energy consumption in clinker production is remarkably reduced, and emission of CO2 greenhouse gas is reduced; and meanwhile, the modified portland cement clinker has the advantages of high early strength, high later strength growth rate, high setting speed, low firing temperature, smallvolume shrinkage and the like.

Description

technical field [0001] The invention relates to the field of cement industry production technology and comprehensive utilization of industrial solid waste, in particular to a modified Portland cement clinker and a preparation method thereof. Background technique [0002] Cement is one of the most used industrial products in the world. Portland cement clinker is fired at a high temperature, consumes a large amount of high-quality limestone resources, and produces a large amount of CO 2 Greenhouse gases and SO x , NO x and other harmful gases. At the same time, the mineral composition of Portland cement clinker is mainly C 3 S, C 2 S, C 3 A and C 4 AF, Portland cement has low early strength and long setting time, and shrinkage cracks may occur in the later stage of hydration, which affects the mechanical properties of cement. Sulphoaluminate cement has excellent characteristics such as early strength, high strength, frost resistance, impermeability, corrosion resistanc...

Claims

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Application Information

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IPC IPC(8): C04B7/147C04B7/22C04B7/24C04B7/26C04B7/38C04B7/44
CPCY02P40/10
Inventor 朱兵兵邹兴芳梁进陈力
Owner GEZHOUBA SONGZI CEMENT
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