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Low-alkality Portland cement clinker and preparation method thereof

A Portland cement and clinker technology, which is applied in cement production and other directions, can solve the problem that the grindability and scorchability are difficult to ensure, and the low-alkali Portland cement clinker is difficult to achieve continuous production, grindability and ease of use. The problem of high content of sintered siliceous materials can achieve the effect of good calcination effect, increased compressive strength and low alkali content

Active Publication Date: 2018-07-24
葛洲坝松滋水泥有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practice, due to limestone grade problems, or need to use more siliceous correction materials (such as siltstone, silica) and aluminum correction materials (such as wet coal ash) with relatively low alkali content to replace some high-alkali silicon-aluminum materials (such as shale), resulting in a high content of siliceous materials with poor grindability and burnability, it is difficult to guarantee the grindability and burnability of raw materials, and the final low-alkali Portland cement clinker is difficult Realize continuous production

Method used

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  • Low-alkality Portland cement clinker and preparation method thereof
  • Low-alkality Portland cement clinker and preparation method thereof
  • Low-alkality Portland cement clinker and preparation method thereof

Examples

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Effect test

Embodiment 1

[0027] Using the preparation method of low-alkali Portland cement clinker, produce low-alkali Portland cement clinker on the new dry process production line of 2500t clinker / d. The control range of the three rate values ​​of the clinker is: saturation ratio KH=0.930± 0.020, silicic acid SM=2.65±0.10, aluminum rate IM=1.40±0.10. The specific operation steps are:

[0028] 1) Determine the range of limestone mix ratio: according to the chemical composition of different grades of limestone A and limestone B, iron ore, shale, wet fly ash and siltstone, as well as the calorific value, ash content, ash chemical composition and The unit heat consumption value of kiln clinker production is 3429kJ / kg, and the alkali content R 2 O≤0.60wt%, and siltstone with poor grindability and burnability, the wet basis ratio in the raw meal is ≤3.0wt%;

[0029] 2) Raw material pretreatment: crush or sieve limestone, iron ore, shale, wet fly ash and siltstone, and mix and pre-homogenize limestone of...

Embodiment 2

[0061] Using the preparation method of low-alkali Portland cement clinker, produce low-alkali Portland cement clinker on the new dry process production line of 4800t clinker / d. The control range of the three rate values ​​of the clinker is: saturation ratio KH=0.930± 0.020, silicic acid SM=2.65±0.10, aluminum ratio IM=1.40±0.10. The specific operation steps are:

[0062] 1) Determine the range of limestone mix ratio: according to the chemical composition of different grades of limestone A and limestone B, iron ore, shale, wet fly ash and siltstone, as well as the calorific value, ash content, ash chemical composition and The unit heat consumption value of clinker production in the kiln is 3136kJ / kg, and the alkali content R 2 O≤0.60wt%, and siltstone with poor grindability and burnability, the wet basis ratio in the raw meal is ≤3.0wt%;

[0063] 2) Raw material pretreatment: Limestone, iron ore, shale, wet fly ash and siltstone are crushed or sieved, and different grades of ...

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Abstract

The invention belongs to the technical field of production of Portland cement clinker, and particularly relates to a low-alkality Portland cement clinker and a preparation method thereof. The low-alkality Portland cement clinker is characterized by being prepared from limestone in different grades, iron ore, shale, wet fly ash and siltstone as raw materials according to the steps of grinding, uniformly mixing, calcinating at high temperature and then cooling. The low-alkality Portland cement clinker prepared by the preparation method is low in alkali content, low in water requirement, high instrength and high in utilization rate of low-grade limestone.

Description

technical field [0001] The invention relates to the technical field of Portland cement clinker production, in particular to a low-alkali Portland cement clinker and a preparation method thereof. Background technique [0002] Low-alkali cement is the main cementitious material that can inhibit the alkali-aggregate reaction (or alkali-aggregate reaction) and enhance the durability of the project, which is widely concerned in the construction industry today. Generally speaking, the cement whose alkali content in cement does not exceed 0.60wt% is called low-alkali cement. [0003] Due to the low alkali content of low-alkali cement, the cement will not cause problems such as large shrinkage and easy cracking of cement products due to too high early hydration speed due to too high alkali. At the same time, due to the low alkali content of cement, in some concrete buildings and components, it is greatly The risk of chemical reaction between alkali and aggregate is reduced, and the...

Claims

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Application Information

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IPC IPC(8): C04B7/26C04B7/02C04B7/22C04B7/36
CPCC04B7/02C04B7/22C04B7/26C04B7/36Y02P40/10
Inventor 向丛阳陈俊华王刚郑志龙邹兴芳李飞
Owner 葛洲坝松滋水泥有限公司
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