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High addition fly ash cement and method for producing the same

A technology with high content of fly ash cement, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of environmental hazards, complex production process, low early strength, etc., to reduce production capacity Consumption and cost, reduce production cost, prevent the effect of steel corrosion

Inactive Publication Date: 2008-05-07
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The amount of fly ash cement fly ash introduced in Chinese patent 88102201.2 is 20-40%, but hydrofluoric acid anhydrous gypsum needs to be added, which is very harmful to the environment
The fly ash cement produced by the wet method introduced in Chinese patent 94116979.0 uses hemihydrate gypsum, which has the characteristics of fast setting, but it is prone to flash setting in engineering applications
Patent CN1554611A introduces a kind of phosphoric acid fly ash cement, but its production process is complicated, and its application has limitations, and it is only suitable for quick repair projects, etc.
[0007] At present, there is no fly ash cement that uses more than 40% fly ash and has a simple production process, and the general fly ash cement has the problems of long setting time and low early strength

Method used

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  • High addition fly ash cement and method for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Adopt HB-F fly ash in Table 1, control particle size 400 mesh sieve remaining 10%, mix dihydrate gypsum and calcined gypsum with the weight ratio of dihydrate gypsum: calcined gypsum=1:2 to obtain mixed gypsum, water reducing agent adopts wood Sodium sulfonate; activator adopts the mixture of sodium carbonate and alum (sodium carbonate: the mass ratio of alum=1: 1), above-mentioned various raw materials are mixed according to the mass percentage content listed in table 2, ball milling, control overall particle size 200 Mesh sieve remaining 10%. According to the GB1344-1999 test method, the performance is measured, and the measurement results are listed in Table 3. From the results, it can be seen that the cement of this embodiment reaches the 425 grade cement in GB1344-1999.

Embodiment 2

[0030] Adopt SD-F fly ash in Table 1, control particle size 400 mesh sieve remaining 10%, mix dihydrate gypsum and calcined gypsum with the weight ratio of dihydrate gypsum: calcined gypsum=1:10 to obtain mixed gypsum, water reducing agent adopts wood Sodium sulfonate; activator adopts the mixture of calcium chloride and sodium sulfate (calcium chloride: the mass ratio of sodium sulfate=1: 2), above various raw materials are mixed according to the mass percentage content listed in table 2, ball milling, Control the remaining 10% of the particle size through a 200-mesh sieve. According to the GB1344-1999 test method, the performance is measured, and the measurement results are listed in Table 3. From the results, it can be seen that the cement of this embodiment reaches the 525 grade cement in GB1344-1999.

Embodiment 3

[0032] Adopt HN-F fly ash in Table 1, control particle size 400 mesh sieve remaining 10%, mix dihydrate gypsum and calcined gypsum with the weight ratio of dihydrate gypsum: calcined gypsum=10:1 to obtain mixed gypsum, water reducer adopts poly Sodium methine naphthalene sulfonate; activator adopts the mixture of calcium chloride and sodium sulfate (calcium chloride: the mass ratio of sodium sulfate=1: 3), with above various raw materials according to the mass percent content listed in table 2 Mixing, ball milling, controlling particle size 200 mesh sieve remaining 10%. According to the GB1344-1999 test method, the performance is measured, and the measurement results are listed in Table 3. From the results, it can be seen that the cement of this embodiment reaches the 325 grade cement in GB1344-1999.

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Abstract

The invention relates to high-dosage pulverized coal cement and the production method thereof, and belongs to the technical field of cement. The invention aims to realize high-dosage pulverized coal cement with the coal ash quality of over 40 percent and the simple production art. The invention comprises the steps as follows; the coal ash and the cement clinker are taken as the main material, after respectively grinding, a little gypsum and proper water decreasing agent and kindling agent are added, and mixing ball grinding treatment is performed. All properties meet the national coal ash cement standard requirement. The pulverized coal cement produced by the invention has the advantages of large dosage of coal ash, high early intensity, stable product quality, low production cost and small energy consumption. The invention has great significance for adopting coal ash castoff cosmically and saving the cost of cement.

Description

technical field [0001] The present invention relates to a kind of cement and its preparation method, more specifically, the present invention relates to a kind of fly ash cement and its preparation method. Background technique [0002] Fly ash is dust collected from the flue gas of pulverized coal-fired boilers, and is one of the "three wastes" in industry. China is the largest coal producing and consuming country in the world. With the comprehensive utilization of coal, a large amount of fly ash is produced. The utilization rate of fly ash in developed countries such as the European Union and the United States has reached 70-90%, while the utilization rate of fly ash in my country is only 30-40%. [0003] Cement is the most widely used cementing material in engineering construction. At present, China's annual cement output has exceeded 700 million tons, ranking first in the world. But its pollution is getting bigger and bigger, which is not in line with the sustainable de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/08C04B7/02C04B7/04
CPCC04B28/02C04B2103/302C04B40/0039Y02W30/91C04B22/143C04B22/145C04B22/16C04B12/04C04B18/08C04B22/062C04B22/10C04B22/124C04B22/147C04B22/148C04B18/248C04B24/08C04B24/18C04B24/22C04B24/226
Inventor 韩敏芳杨志宾付毅
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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