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A kind of alkali residue water-retaining agent and its spray drying preparation method and application

A water-retaining agent and alkali slag technology, applied in the field of building materials, can solve the problems of destroying the internal pore structure of chlor-alkali slag and reducing water retention

Active Publication Date: 2019-12-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of preparing powder can be to directly prepare the chlor-alkali slag into powder by grinding, but this method will destroy part of the internal pore structure of the chlor-alkali slag, resulting in a decrease in water retention

Method used

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  • A kind of alkali residue water-retaining agent and its spray drying preparation method and application
  • A kind of alkali residue water-retaining agent and its spray drying preparation method and application
  • A kind of alkali residue water-retaining agent and its spray drying preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Preparation of alkali slag water retaining agent by spray drying method and chlor-alkali slag removal:

[0027] 1) Mix the alkali slag and water evenly to obtain a mixture of alkali slag and water, dehydrate the mixture of alkali slag and water, the moisture content after dehydration is 95%, and the obtained chloride ion content is 1.2wt% of the total solid mass in the mixture Chlor-alkali slag;

[0028] 2) adding water to the chlorine-alkali removal slag with the chlorine ion content being 1.2wt% of the total solid mass in the mixture, and fully stirring evenly to make a chlor-alkali removal slag slurry with a solid mass percentage of 20wt%;

[0029] 3) Introduce the chlor-alkali slag slurry into the atomizer, which is a centrifugal atomizer spray drying equipment. The temperature in the drying chamber is controlled at 80° C. to obtain an alkali slag water-retaining agent with a 0.30 mm sieve residue of 4 wt%.

Embodiment 2

[0031] Preparation of alkali slag water retaining agent by spray drying method and chlor-alkali slag removal:

[0032] 1) Mix the alkali slag and water evenly to obtain a mixture of alkali slag and water, dehydrate the mixture of alkali slag and water, the moisture content after dehydration is 96%, and the obtained chloride ion content is 0.9wt% of the total solid mass in the mixture Chlor-alkali slag removal.

[0033] 2) adding water to the chlor-alkali removal slag with the chlorine ion content being 0.9wt% of the total solid mass in the mixture, fully stirring evenly, and making a chlor-alkali removal slag slurry with a solid mass percentage of 30wt%;

[0034] 3) Introduce the chlor-alkali slag slurry into the atomizer, which is a spray drying equipment of air-flow atomizer. The temperature in the drying chamber is controlled at 100° C. to obtain an alkali slag water-retaining agent with a 0.30 mm sieve residue of 8 wt%.

Embodiment 3

[0036] Preparation of alkali slag water retaining agent by spray drying method and chlor-alkali slag removal:

[0037] 1) Mix the alkali slag and water evenly to obtain a mixture of alkali slag and water, dehydrate the mixture of alkali slag and water, the water content after dehydration is 93%, and the content of chloride ions is 0.5wt% of the total solid mass in the mixture Chlor-alkali slag;

[0038] 2) Adding water to the chlor-alkali slag with a chlorine ion content of 0.5wt% of the total solid mass in the mixture, fully stirring evenly, and making a chlor-alkali slag slurry with a solid mass percentage of 40wt%;

[0039] 3) Introduce the chlor-alkali slag slurry into the atomizer, which is a centrifugal atomizer spray drying equipment. The temperature in the drying chamber is controlled at 120° C. to obtain an alkali slag water-retaining agent with a 0.30 mm sieve residue of 7 wt%.

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Abstract

The invention discloses an alkali-sludge water-retaining agent as well as a spray drying preparation method and application thereof. Dechlorination alkali sludge is prepared into powder by virtue of a spray drying process as a water-retaining agent, and the powder has a 0.30mm sieve residue rate of 10wt%. The inorganic powder water-retaining agent prepared by virtue of the preparation method has good water-retaining property and is economic, environmentally friendly and capable of improving the water-retaining property of mortar and the shrinkage of concrete.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a method and application of preparing chlor-alkali slag slurry into powder by using a spray drying process and using it as a water-retaining agent. Background technique [0002] Soda slag is the waste residue produced by the ammonia-soda method. my country is currently the largest soda ash producer in the world. The soda slag produced by the production of soda ash is as high as 3 million tons every year. Such a large amount of soda slag has already caused many environmental pollution problems. . However, the content of chloride ions in alkali slag is extremely high. In the dry state, the ion mass fraction of chloride ions can reach 10%, which brings great difficulties to the comprehensive treatment of alkali slag. At present, the utilization rate of alkali slag in my country is only 3-3%. 4%, mainly stockpiled or reclamation disposal, which also caused great environme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B22/00C04B28/00C04B103/46
CPCC04B22/00C04B28/00C04B2103/46C04B18/08C04B18/141
Inventor 杨医博傅国强梁竣杰郭文瑛普永强庞珺然蔡泽鑫王恒昌覃文杰
Owner SOUTH CHINA UNIV OF TECH
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