Phosphogypsum cement retarder and preparation method thereof

A technology of cement retarder and phosphogypsum, which is applied in the field of cement retarder, can solve the problems that phosphogypsum cannot be used to prepare cement retarder, and achieve the effect of enhancing the flexural strength and compressive strength

Active Publication Date: 2020-04-10
宁国市锦泰环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of this invention is to provide a kind of phosphogypsum cement retarder and preparation method thereo

Method used

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  • Phosphogypsum cement retarder and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The phosphogypsum cement retarder is prepared by the following steps:

[0022] Mix 2.0 parts of methyltriethoxysilane, 15 parts of modified diatomaceous earth, and 3 parts of water in a weight ratio for 1 hour to obtain a modifier; then, mix the modifier with 8 parts of lime powder and 50 parts of phosphorus The gypsum is sent to a cyclone dryer for mixing and drying. The drying temperature of the cyclone dryer is 60°C, and then it is collected through a dust bag to obtain a semi-finished product of retarder; finally, the semi-finished product of retarder is aged for 6 hours to obtain a retarder.

Embodiment 2

[0024] The phosphogypsum cement retarder is prepared by the following steps:

[0025] Firstly, 2.5 parts of methyltriethoxysilane, 12 parts of modified diatomaceous earth and 5 parts of water were mixed by weight for 1 hour to obtain the modifier; then, the modifier was mixed with 5 parts of lime powder and 40 parts of water. Part of the phosphogypsum is sent to a cyclone dryer for mixing and drying. The drying temperature of the cyclone dryer is 60°C, and then collected by a dust bag to obtain a semi-finished product of retarder. Finally, the semi-finished product of retarder is aged for 5 hours to obtain a retarder.

Embodiment 3

[0027] The phosphogypsum cement retarder is prepared by the following steps:

[0028] Firstly, 3.0 parts of methyltriethoxysilane, 15 parts of modified diatomaceous earth, and 5 parts of water were mixed by stirring for 1 hour to obtain the modifier; then, the modifier was mixed with 7 parts of lime powder and 60 parts of water. Part of the phosphogypsum is sent to a cyclone dryer for mixing and drying. The drying temperature of the cyclone dryer is 60°C, and then collected by a dust-removing bag to obtain a retarder semi-finished product; finally, the retarder semi-finished product is aged for 7 hours to obtain a retarder.

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Abstract

The invention discloses a phosphogypsum cement retarder. The phosphogypsum cement retarder comprises, by weight, 40-60 parts of phosphogypsum, 5-8 parts of lime powder, 2.0-3.0 parts of a silane coupling agent, 10-15 parts of modified diatomite and 3-5 parts of water. The defects in the prior art are overcome, the modified diatomite in the cement retarder can adsorb the coupling agent, the coupling agent has an enhancing effect on adsorption of soluble phosphorus and fluorine by the modified diatomite, and the modified diatomite can react with the soluble phosphorus and fluorine to reduce thecontent of the soluble phosphorus and fluorine in the cement retarder; and additionally, the modified diatomite enhances the flexural strength and compressive strength of the cement when the cement retarder is used for Portland cement.

Description

Technical field [0001] The invention relates to the technical field of cement retarders, in particular to a phosphogypsum cement retarder and a preparation method thereof. Background technique [0002] Phosphogypsum is a waste produced in the production of phosphate fertilizers. The output of phosphogypsum waste has gradually increased in recent years. Its main chemical component is dihydrate gypsum (CaSO 4 ·2H 2 O), the mass is about 80% to 98%, and a small amount of impurities are present. The main purpose of phosphogypsum is to produce cement retarder, but fresh phosphogypsum contains residual H 3 PO 4 And HF and unreacted H 2 SO4, so phosphogypsum will show weak acidity, Ph=2~4, in addition, phosphogypsum still has organic phosphorus, etc., so that the soluble phosphorus and fluorine contained in phosphogypsum can be directly added to cement. , The soluble phosphorus, fluorine, etc. contained in it will delay the early hydration rate of cement, causing the phosphogypsum to fa...

Claims

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Application Information

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IPC IPC(8): C04B24/42C04B103/22
CPCC04B40/0039C04B2103/22C04B22/144C04B22/064C04B24/42C04B22/06
Inventor 闵锐
Owner 宁国市锦泰环保科技有限公司
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