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A method for reducing the minimum eutectic point of low-heat Portland cement clinker

A technology of Portland cement and eutectic point, which is applied in the field of building materials, can solve the problems of unfavorable construction progress and project quality of concrete projects, hinder the large-scale application of hydraulic dams, and low early strength of low-heat Portland cement, etc., to achieve the lowest reduction Eutectic point, make up for the lack of early strength, and improve the effect of early strength

Active Publication Date: 2018-02-06
CHINA THREE GORGES CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the early strength of low-heat Portland cement is low, which is unfavorable to the construction progress and quality of concrete projects, and hinders its large-scale application in hydraulic dam construction.

Method used

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  • A method for reducing the minimum eutectic point of low-heat Portland cement clinker
  • A method for reducing the minimum eutectic point of low-heat Portland cement clinker
  • A method for reducing the minimum eutectic point of low-heat Portland cement clinker

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Limestone, silica, lead-zinc tailings, and iron ore are used as raw materials (see Table 1 for chemical composition). According to the mineral composition of the low-heat Portland cement clinker designed in Table 2, the lime saturation coefficient of the low-heat Portland cement clinker is 0.78; the silicon rate is 2.6; the aluminum rate is 0.68, the chemical composition of the clinker is calculated, and the batching is carried out. The results are in parts by weight, and the ratio of raw materials is shown in Table 3. These raw materials are put together into a ball mill and ground to 80 μm square hole sieve with ≤12% of the raw meal powder, and the raw meal powder is burned to melt and cooled to obtain low-heat portland cement clinker. The raw meal powder is placed in a video-type sintering point tester to raise the temperature, and the heating rate is controlled at 50°C / min when the temperature is below 850°C; it is controlled at 5°C / min when it is above 850°C. The ...

Embodiment 2

[0039] Limestone, silica, lead-zinc tailings, and iron ore are used as raw materials (see Table 1 for chemical composition). According to the mineral components of the low-heat Portland cement clinker designed in Table 2, the lime saturation coefficient of the low-heat Portland cement clinker is 0.82; the silicon rate is 2.8; the aluminum rate is 0.72, the chemical composition of the clinker is calculated, and the batching is performed. The results are in parts by weight, and the ratio of raw materials is shown in Table 5. Put these raw materials together and grind them until the raw meal powder with a residue of ≤11% is sieved through an 80 μm square hole sieve. The raw meal powder is placed in a video-type sintering point tester to raise the temperature, and the heating rate is controlled at 50°C / min when the temperature is below 850°C; it is controlled at 5°C / min when it is above 850°C. The lowest eutectic point was determined by a video sintering point tester.

[0040] L...

Embodiment 3

[0046] Limestone, silica, lead-zinc tailings, and iron ore are used as raw materials (see Table 1 for chemical composition). According to the mineral components of the low-heat Portland cement clinker designed in Table 2, the lime saturation coefficient of the low-heat Portland cement clinker is 0.79; the silicon rate is 2.7; the aluminum rate is 0.69, the chemical composition of the clinker is calculated, and the batching is performed. The results are in parts by weight, and the ratio of raw materials is shown in Table 7. Put these raw materials together into an experimental ball mill and grind until ≤10% raw meal powder is sieved through an 80 μm square hole sieve. The raw meal powder is placed in a video-type sintering point tester to raise the temperature, and the heating rate is controlled at 50°C / min when the temperature is below 850°C; it is controlled at 5°C / min when the temperature is above 850°C. The lowest eutectic point was determined by a video sintering point te...

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Abstract

The invention relates to a method for lowering the minimum eutectic point of low-heat Portland cement clinker. The method is to use metal elements in lead-zinc tailings for mineral solid solution, induce silicate mineral crystal lattice distortion, and reduce silicic acid. The lattice energy of salt minerals can reduce the minimum eutectic point of low-heat Portland cement clinker; according to the composition of low-heat cement clinker and its three indicators of lime saturation coefficient, silicon rate and aluminum rate of clinker, determine the raw material components and each The weight ratio of the raw meal components: fully mix the prepared raw meal components, and grind them into raw meal powder; burn until melted, and cool to obtain low-heat Portland cement clinker. The low-heat Portland cement clinker produced by the invention can reduce production costs, reduce coal consumption by 5%-10%, increase the output of low-heat Portland cement clinker by 5%-10% per unit time, and can significantly reduce low-heat Portland cement clinker. The lowest eutectic point of salt cement clinker.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a method for reducing the minimum eutectic point of low-heat Portland cement clinker. Background technique [0002] Traditional Portland cement is one of the most important building materials. But, because contain a large amount of high calcium Alite (Alite, abbreviated as C 3 S) minerals, therefore there are some shortcomings and deficiencies that are difficult to overcome. For example, the slump loss of cement concrete is fast, and the construction performance is poor; the heat of hydration is high, and the concrete is prone to temperature difference cracks; the drying shrinkage is large, and dry shrinkage cracks are easy to occur. [0003] In the construction of hydraulic dams, in order to prevent the occurrence of temperature cracks, cement is required to have low heat of hydration characteristics. Low-heat Portland cement has lower heat of hydration, low drying...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/42C04B7/14
CPCY02P40/10
Inventor 李文伟
Owner CHINA THREE GORGES CORPORATION
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