High-magnesium moderate-heat portland cement and production method thereof

Abstract

The invention relates to a high-magnesium moderate heat portland cement, which is characterized in that (1) the contents of MgO and SO3 in the cement are 3.0-6.5% and 1.4-2.2% respectively; (2) the weight percentages of the mineral composition for grinding cement clinker are 35-55% of C3S, 15-35% of C2S, 1-6% of C3A and 10-25% of C4AF; and the content of MgO in the cement clinker is 3.0-6.5%; (3) in the raw materials for calcining the clinker, the contents of MgO, CaO and Fe2O3 are respectively controlled at a certain value within the ranges of 2.5-3.8%, 38.0-42.0% and 3.5-4.5%, and the variation ranges thereof are respectively controlled within plus or minus 0.10%, plus or minus 0.20% and plus or minus 0.15%. The production method of the cement mainly comprises three procedures of raw material milling, clinker calcining and cement grinding, namely, 'two grinding and one calcining'. The concrete made from the cement is characterized by good fluidity, low water requirement, moderate cement heat, high later strength, good durability, microdilatancy performance, and the like; compared with the conventional portland cement and moderate heat portland cement, the high-magnesium moderate heat portland cement is more favorable for realizing high performance of the concrete.

Description

technical field

[0001] The invention relates to a cement and a preparation method thereof, in particular to a high-magnesium medium-heat cement produced by industrial waste residues such as coal gangue, stone coal, stone cinder, slag, fly ash, desulfurized gypsum, sulfuric acid slag, and high-magnesia limestone. Portland cement and its preparation method. Background technique

[0002] With the continuous deepening of people's understanding of the problems of high energy consumption, high resource consumption, and relatively serious environmental load in the cement industry, and the increasing emphasis on improving the durability of cement concrete, energy saving, consumption reduction, environmental protection, and further improvement of cement concrete performance have become international. The direction of sustainable development of the cement industry. For large-volume concrete projects, especially dam concrete, the increase in the internal temperature of the concrete is...

Examples

Embodiment 1

[0010] Embodiment 1: adopt proportioning as limestone: dolomite: coal gangue: sulfuric acid slag: silica sand=69.95: 8.85: 14.20: 5.11: 1.89 carries out batching, and raw material chemical composition sees 1, 3, 4, 8, 9 in Table 1 . High-magnesium medium-heat Portland cement clinker is calcined on a cement rotary kiln. See Example 1 in Table 2 for clinker composition, rate and mineral composition. The clinker is mixed with different types of gypsum as a retarder to grind high-magnesium medium-heat Portland cement. Its conventional physical properties are shown in Example 1 in Table 3. For detailed production process, see figure 1 production flow chart.

[0011] Table 1 Example 1 to 5 Raw material chemical composition %

[0012] serial number

name

LOSS

SiO 2

Al 2 o 3

Fe 2 o 3

CaO

MgO

SO 3

∑

1

limestone

41.10

3.78

1.39

0.48

50.86

1.15

/

98.76

2

...

Embodiment 2

[0017] Embodiment 2: The proportioning is limestone: high magnesium limestone: coal gangue: sulfuric acid slag: silica sand=32.85: 46.78: 13.12: 5.42: 1.83 for batching, and the chemical composition of raw materials is shown in 1, 2, 4, 8 in Table 1 , 9, produce high-magnesium medium-heat Portland cement clinker and cement with the method of embodiment one, and its clinker composition, rate value and mineral composition are shown in example 2 in Table 2, and the conventional physical properties of cement are shown in Example 3 in Table 3 2.

Embodiment 3

[0018] Embodiment three: adopt proportioning to be limestone: dolomite: stone coal slag: sulfuric acid slag: fly ash=68.71: 10.95: 9.78: 5.55: 5.01 carries out batching, and raw material chemical composition sees 1,3,5,8, in table 1 10. Use the method of Example 1 to produce high-magnesium medium-heat Portland cement clinker and cement. The clinker composition, rate and mineral composition are shown in Example 3 in Table 2. The conventional physical properties of cement are shown in Example 3 in Table 3. .

technical field

[0001] The invention relates to a cement and a preparation method thereof, in particular to a high-magnesium medium-heat cement produced by industrial waste residues such as coal gangue, stone coal, stone cinder, slag, fly ash, desulfurized gypsum, sulfuric acid slag, and high-magnesia limestone. Portland cement and its preparation method. Background technique

[0002] With the continuous deepening of people's understanding of the problems of high energy consumption, high resource consumption, and relatively serious environmental load in the cement industry, and the increasing emphasis on improving the durability of cement concrete, energy saving, consumption reduction, environmental protection, and further improvement of cement concrete performance have become international. The direction of sustainable development of the cement industry. For large-volume concrete projects, especially dam concrete, the increase in the internal temperature of the concrete is...

Examples

Embodiment 1

[0010] Embodiment 1: adopt proportioning as limestone: dolomite: coal gangue: sulfuric acid slag: silica sand=69.95: 8.85: 14.20: 5.11: 1.89 carries out batching, and raw material chemical composition sees 1, 3, 4, 8, 9 in Table 1 . High-magnesium medium-heat Portland cement clinker is calcined on a cement rotary kiln. See Example 1 in Table 2 for clinker composition, rate and mineral composition. The clinker is mixed with different types of gypsum as a retarder to grind high-magnesium medium-heat Portland cement. Its conventional physical properties are shown in Example 1 in Table 3. For detailed production process, see figure 1 production flow chart.

[0011] Table 1 Example 1 to 5 Raw material chemical composition %

[0012] serial number

name

LOSS

SiO 2

Al 2 o 3

Fe 2 o 3

CaO

MgO

SO 3

∑

1

limestone

41.10

3.78

1.39

0.48

50.86

1.15

/

98.76

2

...

Embodiment 2

[0017] Embodiment 2: The proportioning is limestone: high magnesium limestone: coal gangue: sulfuric acid slag: silica sand=32.85: 46.78: 13.12: 5.42: 1.83 for batching, and the chemical composition of raw materials is shown in 1, 2, 4, 8 in Table 1 , 9, produce high-magnesium medium-heat Portland cement clinker and cement with the method of embodiment one, and its clinker composition, rate value and mineral composition are shown in example 2 in Table 2, and the conventional physical properties of cement are shown in Example 3 in Table 3 2.

Embodiment 3

[0018] Embodiment three: adopt proportioning to be limestone: dolomite: stone coal slag: sulfuric acid slag: fly ash=68.71: 10.95: 9.78: 5.55: 5.01 carries out batching, and raw material chemical composition sees 1,3,5,8, in table 1 10. Use the method of Example 1 to produce high-magnesium medium-heat Portland cement clinker and cement. The clinker composition, rate and mineral composition are shown in Example 3 in Table 2. The conventional physical properties of cement are shown in Example 3 in Table 3. .

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