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A kind of caustic soda slag-free ceramsite with high alkali slag content and preparation method thereof

A technology of ceramsite and alkali slag, which is applied in the field of caustic soda-free slag ceramsite with high content of alkali slag and its manufacturing field, can solve the problems of land resource destruction, waste of energy, etc., to reduce pollution, reduce energy consumption, and avoid roasting process. Effect

Active Publication Date: 2016-06-15
长沙柳腾科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the problem of releasing chloride ions when ceramsite is applied to concrete in the prior art, as well as the problems of land resource destruction and energy waste during firing ceramsite, thereby providing a caustic-free soda slag with high alkali slag content Ceramsite and its manufacturing method

Method used

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  • A kind of caustic soda slag-free ceramsite with high alkali slag content and preparation method thereof

Examples

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Effect test

example 1

[0032] Alkali slag core layer: 40wt% alkali slag, 30% fly ash, 30wt% glass powder; cement shell: 35wt% cement, 35wt% glass powder, 30% fly ash; aqueous solution: NaOH2%, water 98%; The water-cement ratio of the core layer: 0.2; the water-cement ratio of the shell layer: 0.3.

[0033] The dry material ratio of the shell layer and the core layer is 0.5. Considering the size and irregular shape of the ceramsite and a small amount of adhesion between the ball-forming disc and the shell slurry during the wrapping process, the mass percentage of each ceramsite shell layer is about 20. -30wt%, the shell thickness is about 2-3mm. After curing for 5 days, the chloride ion capacity of ceramsite soaked in deionized water for 24 hours is about 0.7% (accounting for the total amount of chloride ions).

example 2

[0035] Alkali slag core layer: 45wt% alkali slag, 25% fly ash, 30wt% glass powder; cement shell: 40wt% cement, 30wt% glass powder, 30% fly ash; aqueous solution: NaOH2%, water 98%; The water-cement ratio of the core layer: 0.2; the water-cement ratio of the shell layer: 0.3.

[0036] The dry material ratio of the shell layer and the core layer is 0.5. Considering the size and irregular shape of the ceramsite and a small amount of adhesion between the ball-forming disc and the shell slurry during the wrapping process, the mass percentage of each ceramsite shell layer is about 20. -30wt%, the shell thickness is about 2-3mm. After 5 days of curing, the chloride ion capacity of ceramsite soaked in deionized water for 24 hours is about 1% (accounting for the total amount of chloride ions).

example 3

[0038] Alkali slag core layer: alkali slag dosage 50wt%, fly ash 25%, glass powder 20wt%, lime 5wt%; cement shell layer: cement 45wt%, glass powder 35wt%, fly ash 20%; aqueous solution: NaOH2%, Water 98%; core water-cement ratio: 0.2; shell water-cement ratio: 0.3.

[0039] The dry material ratio of the shell layer and the core layer is 0.5. Considering the size and irregular shape of the ceramsite and a small amount of adhesion between the ball-forming disc and the shell slurry during the wrapping process, the mass percentage of each ceramsite shell layer is about 20. -30wt%, the shell thickness is about 2-3mm. After curing for 5 days, the chloride ion capacity of ceramsite soaked in deionized water for 24 hours is about 1.6% (accounting for the total amount of chloride ions).

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Abstract

A non-sintered alkaline-residue ceramsite with a high alkaline residue mixing amount and a manufacturing method thereof belong to the technical field of building materials. The non-sintered alkaline-residue ceramsite has a core-shell composite structure, and comprises an alkaline residue core layer and a cement shell layer, wherein the core layer dry material comprises 40%-50% of alkaline residues, 20%-30% of glass powder, and 20%-30% of fly ash, and the shell layer dry material comprises 30%-50% of cement, 20%-30% of glass powder, and 20%-30% of fly ash. The manufacturing method comprises the following steps: adding 2 wt% of a sodium hydroxide aqueous solution into the core layer dry material to obtain a water cement ratio of 0.2, uniformly stirring, performing pelleting to obtain pellets with a diameter of 7-12 mm, and curing for 1 day; adding 2 wt% of a sodium hydroxide aqueous solution into the shell layer dry material to obtain a water cement ratio of 0.3, so as to form slurry; putting the core layer pellets in a balling tray with the shell layer slurry, performing ball rolling to form ceramsites with a wrapping structure; taking the ceramsites out, sprinkling fly ash, shaking to allow the surface to be solidified slightly, performing natural curing to obtain the product. The manufacturing method of the invention inhibits the dissolution of chloride ions in the alkaline residues, and improves the strength of the ceramsite.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to a caustic soda slag-free ceramsite with high alkali slag content and a manufacturing method thereof. Background technique [0002] Alkali slag is the waste residue discharged in the process of alkali production by ammonia-soda method in industry. The annual production of alkali by ammonia-soda method in my country can reach 4.21 million tons. Because of its high water content and large amount of chloride, it has become a kind of solid waste that is difficult to handle. For a long time, the alkali slag discharged from the alkali factory has occupied a large amount of cultivated land and caused great pollution and damage to the environment. The comprehensive treatment of alkali slag has become a major scientific research topic in today's society. In the current situation of increasingly scarce natural resources, the research on using alkali slag to make building materials ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B30/00C04B41/50
Inventor 严建华张程浩崔素萍周朋王亚丽庞保雪张东梅
Owner 长沙柳腾科技有限公司
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