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Low-energy-consumption and low-emission cement and preparation method and application thereof

A low-emission, low-energy-consumption technology, applied in cement production, clinker production, etc., can solve the problems of high energy consumption, large consumption of high-calcium raw materials, etc., and achieve the effects of reducing heat consumption, reducing energy, and saving coal consumption

Inactive Publication Date: 2011-11-23
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with high belite cement, the cement system introduces Minerals, improve the early strength and improve the later strength, but because C still exists in the mineral components of the cement clinker 3 S, which consumes a large amount of high-calcium raw materials and needs to be formed at a relatively high temperature, so the energy consumption of clinker firing is relatively high

Method used

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  • Low-energy-consumption and low-emission cement and preparation method and application thereof
  • Low-energy-consumption and low-emission cement and preparation method and application thereof
  • Low-energy-consumption and low-emission cement and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0044] Embodiment 1, preparation of low energy consumption, low emission cement raw meal

[0045] The raw materials used to prepare the cement product of the present invention include: limestone, bauxite, gypsum and clay (or sandstone), all provided by Tangshan Polar Bear Building Materials Co., Ltd.

[0046] 1. Selection of raw materials

[0047] The above raw materials were pretreated respectively, including drying (105°C), crushing by a crusher, grinding and homogenizing by a ball mill, and samples were taken for full analysis of chemical components. The results are shown in Table 1:

[0048] The chemical composition (weight percent) of table 1 raw material

[0049] sample

L.O.I.

SiO 2

al 2 o 3

Fe 2 o 3

TiO 2

CaO

MgO

SO 3

K 2 o

Na 2 o

limestone

42.72

0.78

0.31

0.08

/

54.77

0.67

/

0.04

0.05

Bauxite

14.68

4.78

74.91

...

Embodiment 2

[0061] Embodiment 2, low energy consumption, low discharge cement clinker calcining and the preparation of cement

[0062] According to the composition design of eight different clinker minerals in Table 2, eight groups of corresponding raw meals were prefabricated. For the raw materials used, refer to Table 1 in Example 1.

[0063] Table 2 mineral composition design (wt%)

[0064]

[0065] 1. Raw meal flammability test: the eight groups of samples in Table 2 are made into small samples with a diameter of 34mm, placed in a muffle furnace at 950°C (850-950°C is acceptable) and pre-fired at a constant temperature for 30min. Put it into silicon-molybdenum rod electric furnace at 6 temperatures: 1250°C, 1280°C, 1300°C, 1320°C, 1350°C and 1380°C for 30 minutes at constant temperature, then take out the clinker quickly and cool it to room temperature with a fan, and grind it to pass through an 80μm test sieve According to GB / T 176-2008 "Methods for Chemical Analysis of Cement", ...

Embodiment 3

[0074] Embodiment 3, the optimization of low energy consumption, low emission cement clinker mineral components

[0075] The optimization experiments all adopt the following method to prepare cement samples: place the dried raw material test cake (the large sample in Example 1, φ118mm × 118mm) on a platinum sheet, and put it into a muffle furnace with a temperature of 950°C Pre-fire at a constant temperature for 45-70 minutes, then immediately transfer the pre-fired test cake together with the platinum sheet into a high-temperature furnace with a constant temperature of 1280°C-1300°C, and calcine at a constant temperature for 45-70 minutes to obtain cement clinker, which is mixed with 5% cement by weight Anhydrite becomes a cement sample.

[0076] 1. In clinker Determination of weight percentage

[0077] Ingredients according to the following design scheme: fixed C 4 AF content of 9%, C 2 S content varies in the range of 35-65%, Mineral contents are 22%, 27%, 32%, 37%, ...

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Abstract

The invention discloses low-energy-consumption and low-emission cement and a preparation method and application thereof. Cement clinker mainly comprises the following minerals in parts by weight: 35-65 parts of C2S, 20-50 parts C4A3S and 5-15 parts of C4AF. A corresponding green stock consists of the following components in parts by weight: 30-60 parts of CaO, 25-35 parts of SiO, 5-35 parts of Al2O3, 1-6 parts of SO3 and 1-10 parts of Fe2O3. The cement clinker is a product which is prepared by calcining limestone, alumina and clay or sandstone and gypsum serving as raw materials at the temperature between 1,280 DEG C and 1,300 DEG C for 45-70 minutes by combining the advantages of low calcium content, low-temperature baking and high later strength of a belite mineral, low-temperature baking and high later strength of anhydrous calcium sulphoaluminate, and the like. The cement product has the advantages of excellent performance, low energy and resource consumption and low carbon dioxide emission, can play an important role in the field of construction, and has a wide application prospect.

Description

technical field [0001] The invention belongs to cement products in the field of chemical industry, and in particular relates to cement with low energy and resource consumption and low carbon dioxide emission, its preparation method and application. Background technique [0002] Since the invention of Portland cement in 1824, cement has been the largest man-made building material, and will remain the main building material in the next 100-200 years, making important contributions to human social progress and economic development. However, the resource and energy consumption and greenhouse gas emissions in the cement production process directly affect the survival and development of human beings. my country's cement production ranks first in the world for several years in a row. In 2010, the cement production reached 1.868 billion tons, accounting for half of the world's total cement production. Therefore, it is imminent and meaningful to realize the low energy, low resource c...

Claims

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Application Information

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IPC IPC(8): C04B7/345
CPCC04B7/32C04B7/43Y02P40/10Y02P40/121
Inventor 李娟隋同波周春英王彬
Owner CHINA BUILDING MATERIALS ACAD
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