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Road delayed-coagulation cement and preparation method thereof

A technology for retarding setting and cement, applied in the field of road retarding cement and its preparation, can solve the problems of limiting the application scope and scale of phosphogypsum, its performance is inferior to natural gypsum, polluting the ecological environment, etc., achieving suitable setting time and improving flammability. , the effect of reducing the impurity content

Inactive Publication Date: 2018-11-02
GEZHOUBA SONGZI CEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Phosphogypsum is the waste residue discharged during the wet process of phosphoric acid production. The main component is calcium sulfate dihydrate, which contains harmful impurities such as phosphorus, fluorine, and organic matter. Its performance is not as good as natural gypsum, which limits the application range and scale of phosphogypsum.
Carbonaceous shale, limestone slag, steel slag, phosphogypsum and other solid wastes have accumulated in large quantities for a long time, occupying a large amount of land, polluting the ecological environment, and posing certain safety risks

Method used

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  • Road delayed-coagulation cement and preparation method thereof
  • Road delayed-coagulation cement and preparation method thereof
  • Road delayed-coagulation cement and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The method of the present invention is used to carry out road retarding cement production test in the new dry precalcining kiln of Gezhouba Songzi Cement Co., Ltd. The specific steps are:

[0037] (1) 78wt% limestone, 15wt% carbon-containing shale, 5wt% iron raw materials (3 parts iron ore + 1 part sulphuric acid slag), 2wt% phosphogypsum are mixed uniformly and ground to prepare cement raw meal.

[0038] (2) The cement raw meal is sent into the precalcining kiln system to be preheated and decomposed, calcined at high temperature, and quickly cooled to make cement clinker.

[0039] The chemical composition of the raw materials in Example 1 is shown in Table 1-1:

[0040] Name

LOSS

SiO 2

Al 2 O 3

Fe 2 O 3

CaO

MgO

SO 3

K 2 O

Na 2 O

Limestone

39.17

7.26

0.91

0.32

49.76

0.80

0.12

0.13

0.04

Carbon shale

6.73

61.52

16.40

5.88

2.51

2.25

0.22

2.81

0.82

Iron raw materials

6.37

6.12

2.93

63.42

8.32

1.00

9.30

0.98

0.17

Phosphogypsum

19.53

7.16

1.73

0.44

29.99

0.08

40....

Embodiment 2

[0046] The method of the present invention is used to carry out road retarding cement production test in the new dry precalcining kiln of Gezhouba Songzi Cement Co., Ltd. The specific steps are:

[0047] (1) 80wt% limestone, 14wt% carbon-containing shale, 5wt% iron raw materials (3 parts iron ore + 1 part sulphuric acid slag), 1wt% phosphogypsum are mixed uniformly and ground to prepare cement raw meal.

[0048] (2) The cement raw meal is sent into the precalcining kiln system to be preheated and decomposed, calcined at high temperature, and quickly cooled to make cement clinker.

[0049] The chemical composition of the raw materials in Example 2 is shown in Table 2-1:

[0050] Name

LOSS

SiO 2

Al 2 O 3

Fe 2 O 3

CaO

MgO

SO 3

K 2 O

Na 2 O

Limestone

39.17

7.26

0.91

0.32

49.76

0.80

0.12

0.13

0.04

Carbon shale

6.73

61.52

16.40

5.88

2.51

2.25

0.22

2.81

0.82

Iron raw materials

6.37

6.12

2.93

63.42

8.32

1.00

9.30

0.98

0.17

Phosphogypsum

19.53

7.16

1.73

0.44

29.99

0.08

40....

Embodiment 3

[0056] The method of the present invention is used to carry out road retarding cement production test in the new dry precalcining kiln of Gezhouba Songzi Cement Co., Ltd. The specific steps are:

[0057] (1) 82wt% limestone, 13wt% carbon-containing shale, 4wt% iron raw materials (3 parts iron ore+1 part sulphuric acid slag), 1wt% phosphogypsum are mixed uniformly and ground to prepare cement raw meal.

[0058] (2) The cement raw meal is sent into the precalcining kiln system to be preheated and decomposed, calcined at high temperature, and quickly cooled to make cement clinker.

[0059] The chemical composition of the raw materials in Example 3 is shown in Table 3-1:

[0060] Name

LOSS

SiO 2

Al 2 O 3

Fe 2 O 3

CaO

MgO

SO 3

K 2 O

Na 2 O

Limestone

39.17

7.26

0.91

0.32

49.76

0.80

0.12

0.13

0.04

Carbon shale

6.73

61.52

16.40

5.88

2.51

2.25

0.22

2.81

0.82

Iron raw materials

6.37

6.12

2.93

63.42

8.32

1.00

9.30

0.98

0.17

Phosphogypsum

19.53

7.16

1.73

0.44

29.99

0.08

40.19...

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Abstract

The invention relates to road delayed-coagulation cement and a preparation method thereof. The road delayed-coagulation cement comprises special cement clinker, limestone waste, modified steel slag powder and phosphorus gypsum. According to the road delayed-coagulation cement, a cement raw material is prepared from carbon-containing shale, the phosphorus gypsum serves as mineralizing agents of clinker calcination, steel slag powder is prepared in a crushing, iron removing and grinding manner, the steel slag powder and the limestone waste serve as cement admixtures, and the phosphorus gypsum serves as a cement delayed coagulant. By the aid of the technical scheme, the prepared road delayed-coagulation cement has the advantages that coagulation time is suitable, early strength is high, laterstrength is rapidly increased, breaking strength is high, abrasion resistance is good, dry shrinkage performance is low and the like. Efficient resource utilization of solid waste such as the carbon-containing shale, the limestone waste, steel slag and the phosphorus gypsum is achieved, and the road delayed-coagulation cement has important economic benefits and social benefits.

Description

Technical field [0001] The invention relates to the field of cement industrial production technology and the comprehensive utilization of industrial solid wastes, in particular to a road retarded cement and a preparation method thereof. Background technique [0002] Road cement is a kind of special cement prepared by grinding road silicate clinker, a certain amount of mixed materials and an appropriate amount of gypsum. It is mainly used in road projects such as airstrips and urban and rural highways. In the process of road construction, due to the long period of construction mixing, paving, compaction, etc., and it must be completed before the cement is completely hardened, the user requires that the initial setting time of the cement should be greater than 4h and the final setting time should not be less than 6h according to the site construction conditions . [0003] Carbon-containing shale is a waste produced during coal mining and processing. It is mainly composed of oxides s...

Claims

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Application Information

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IPC IPC(8): C04B7/30
CPCC04B7/30Y02P40/10
Inventor 朱兵兵郑志龙邹兴芳黄凯张媛媛
Owner GEZHOUBA SONGZI CEMENT
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