Ardealite-based cement setting retarder as well as preparation method and application thereof

A technology of cement retarder and phosphogypsum, which is applied in the field of cement retarder, can solve the problems of low content of phosphogypsum balls, low production efficiency and high production cost, and achieve improved chemical activity, improved production efficiency and good adaptability Effect

Pending Publication Date: 2020-10-30
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Aiming at the problems existing in the prior art, the present invention aims to propose a phosphogypsum-based cement retarder to solve the problems of high production cost, low production efficiency and SO in the modified phosphogypsum balls of the existing phosphogypsum retarder. 3 low content problem

Method used

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  • Ardealite-based cement setting retarder as well as preparation method and application thereof
  • Ardealite-based cement setting retarder as well as preparation method and application thereof
  • Ardealite-based cement setting retarder as well as preparation method and application thereof

Examples

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Embodiment 1

[0028] A phosphogypsum-based cement retarder, which is prepared by mixing 92% phosphogypsum, 5% slag powder, and 3% calcareous quicklime powder in mass percentage, adding water glass and continuing to stir until uniform, and forming into balls; water glass The dosage, converted into Na 2 The mass meter of O is 6% of the slag powder consumption. Among them, the attached water content of phosphogypsum is 17.2%; the CaO content in calcareous quicklime powder is ≥65%, and the sieve allowance of 90 μm is ≤7%; the slag powder is S75 grade slag powder; the modulus of water glass is 1.0.

[0029] The above-mentioned phosphogypsum-based cement retarder is specifically obtained by the following method:

[0030] 1) Mix phosphogypsum, slag powder, and calcareous quicklime powder evenly according to the above-mentioned component distribution ratio, then add water glass, continue stirring until uniform, and obtain the mixed material A;

[0031] 2) Use a disc ball forming machine to form t...

Embodiment 2

[0035] The difference between this embodiment and Example 1 is: the phosphogypsum-based cement retarder of this embodiment, by mass percentage, is mixed with 92% phosphogypsum, 5% slag powder, and 3% calcareous quicklime powder, and then added water The glass is continuously stirred until it is evenly formed into balls; the amount of water glass is converted into Na 2 In terms of the mass of O, it is 10% of the amount of slag powder; among them, the attached water content of phosphogypsum is 17.2%; the CaO content in calcareous quicklime powder is ≥65%, and the sieve allowance of 90 μm is ≤7%; the slag powder is S75 grade slag powder; the modulus of water glass is 1.0.

Embodiment 3

[0037] The difference between this embodiment and Example 1 is: the phosphogypsum-based cement retarder of this embodiment, by mass percentage, is mixed with 92% phosphogypsum, 5% slag powder, and 3% calcareous quicklime powder, and then added water The glass is continuously stirred until it is evenly formed into balls; the amount of water glass is converted into Na 2The mass meter of O is 6% of the slag powder consumption. Among them, the attached water content of phosphogypsum is 17.2%; the CaO content in calcareous quicklime powder is ≥65%, and the sieve allowance of 90 μm is ≤7%; the slag powder is S75 grade slag powder; the modulus of water glass is 1.5.

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Abstract

The invention provides an ardealite-based cement setting retarder and a preparation method and application thereof. The ardealite-based cement setting retarder is prepared by taking, by mass, 90%-95%of ardealite, 3%-6% of slag powder or fly ash and 2%-4% of calcium quicklime powder or calcium slaked lime powder or carbide slag powder, adding an appropriate amount of an alkali activator, mixing and balling; the dosage of the alkali activator is converted into the mass of Na2O and is 6%-15% of the dosage of the slag powder or the coal ash. According to the invention, soluble phosphorus, fluorine and the like in phosphogypsum can be effectively adsorbed and cured, organic matters are neutralized, accordingly, adverse effects of harmful substances in the ardealite on the cement setting time and the early strength can be greatly reduced, the ardealite-based cement setting retarder is short in aging time, and the production efficiency of the ardealite-based cement setting retarder can be greatly improved.

Description

technical field [0001] The invention belongs to the technical field of cement retarders, in particular to a phosphogypsum-based cement retarder and its preparation method and application. Background technique [0002] Phosphogypsum is the waste residue produced during the wet production of phosphoric acid in the phosphate fertilizer industry, and about 5 tons of phosphogypsum will be discharged for every ton of phosphoric acid produced. Due to the rapid growth and development of the phosphorus chemical industry, the output of phosphogypsum waste residue has also increased rapidly. At present, the annual discharge of phosphogypsum in my country is about 84 million tons, and the comprehensive utilization rate is about 30%. As of now, my country's cumulative stockpile of phosphogypsum exceeds 300 million tons. Long-term stacking of phosphogypsum not only takes up a lot of land, but also contains free acid that will pollute groundwater sources, and fluoride will penetrate into...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/14C04B103/22
CPCC04B40/0039C04B2103/22C04B22/144C04B18/141C04B22/064C04B12/04C04B22/062
Inventor 李北星马瑜
Owner WUHAN UNIV OF TECH
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