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Method of simple process for modified denitration coal ash

A technology for fly ash and denitrification, which is applied in the field of modified denitration fly ash and pre-hydration modified denitration fly ash, can solve the problems of reduced strength, increased gas content of concrete, and inability to discharge all gas, and achieves high activity. The effect of enhancing, improving performance

Inactive Publication Date: 2016-11-09
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When a large amount of concrete is mixed in the mixing station, the released gas cannot be completely discharged, and accumulates inside the concrete, which may lead to an increase in the air content of the concrete and a decrease in strength.

Method used

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  • Method of simple process for modified denitration coal ash
  • Method of simple process for modified denitration coal ash
  • Method of simple process for modified denitration coal ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Mix the denitrated fly ash with slaked lime and gypsum evenly in a ratio of 40:5:2, and steam it in a steam curing box with a set temperature of 60°C for 48 hours to make pre-hydrated fly ash, and then heat it at 100°C Dehydrate under the same conditions for 4 hours, grind through a 200-mesh sieve, and obtain the denitrified ash after treatment.

[0028] Table 3 Production method 1 (parameters)

[0029]

Embodiment 2

[0031] Mix the denitrified fly ash with slaked lime and gypsum evenly in a ratio of 40:5:2, and steam it in a steam curing box with a set temperature of 80°C for 48 hours to make pre-hydrated fly ash, and then heat it at 100°C Dehydrate under the same conditions for 4 hours, grind through a 200-mesh sieve, and obtain the denitrified ash after treatment.

[0032] Table 4 Production method 2 (parameters)

[0033]

Embodiment 3

[0035] Mix the denitrated fly ash with slaked lime and gypsum evenly in a ratio of 40:5:2, and steam it in a steam curing box with a set temperature of 100°C for 48 hours to make pre-hydrated fly ash, and then heat it at 100°C Dehydrate under the same conditions for 4 hours, grind through a 200-mesh sieve, and obtain the denitrified ash after treatment.

[0036] Table 5 Production method three (parameters)

[0037]

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Abstract

The invention discloses a method of a simple process for modified denitration coal ash. The method comprises the following steps: firstly, boiling denitration coal ash, slaked lime and gypsum in a certain ratio for 48 hours at the steaming temperature of 100 DEG C, dehydrating, grinding, and adding into Portland cement. Not only is the purpose of removing a denitration byproduct achieved, but also the defects that coal ash is slow to hydrate at an early stage and the strength contribution is small within 28 days are overcome. As the modified denitration coal ash is taken as a mixing material, the strength of cement can be greatly improved, the property of the cement can be improved, the cement production cost can be lowered, and thus the denitration coal ash can be effectively utilized.

Description

technical field [0001] The invention relates to the preparation of a building material, in particular to a method for modifying denitration fly ash with a simple process, which is to modify the denitration fly ash through prehydration. Background technique [0002] Fly ash is a waste from coal-fired power plants, which is collected by power plants. With the rapid development of the electric power industry, the discharge of fly ash has increased sharply. The annual discharge of fly ash in my country is more than 100 million tons, which has caused huge pressure on national economic construction and ecological environment. At the same time, fly ash is a valuable reusable resource. Fly ash has been widely used in production as a mineral admixture of concrete. Various studies have shown that the micro-aggregate effect of fly ash, the form Effect, activity effect and volcanic ash effect can greatly improve the construction workability and long-term durability of concrete, and can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/08C04B20/02
CPCC04B18/08C04B20/023Y02W30/91
Inventor 王利新王琦宋鹏陈延昌
Owner UNIV OF JINAN