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A kind of phosphogypsum cement retarder and preparation method thereof

A technology of cement retarder and phosphogypsum, applied in the field of cement retarder, can solve the problems of reducing strength, pollution, occupying a large space, etc., and achieve the effect of enhancing flexural strength and compressive strength

Active Publication Date: 2021-10-29
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

The main use 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, there are organic phosphorus left in phosphogypsum, so that the soluble phosphorus and fluorine contained in phosphogypsum can be directly added to cement , the soluble phosphorus and fluorine contained in it will delay the early hydration rate of cement, resulting in the incorrect setting of phosphogypsum and the reduction of strength
However, the removal of soluble phosphorus and fluorine by washing or stacking will naturally cause pollution, and stacking will take up a lot of space

Method used

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  • A kind of phosphogypsum cement retarder and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Phosphogypsum cement retarder is prepared by the following steps:

[0021] Stir and mix 2.0 parts of methyltriethoxysilane, 15 parts of modified diatomaceous earth and 3 parts of water by weight 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 by a dust bag to obtain a semi-finished retarder; finally, the semi-finished retarder is aged for 6 hours to obtain a retarder.

Embodiment 2

[0023] Phosphogypsum cement retarder is prepared by the following steps:

[0024] First, stir and mix 2.5 parts of methyltriethoxysilane, 12 parts of modified diatomaceous earth and 5 parts of water by weight for 1 hour to obtain a modifier; then, mix the modifier with 5 parts of lime powder and 40 Parts of phosphogypsum are 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 retarder; finally, the semi-finished retarder is aged for 5 hours to obtain a retarder.

Embodiment 3

[0026] Phosphogypsum cement retarder is prepared by the following steps:

[0027] First, 3.0 parts of methyltriethoxysilane, 15 parts of modified diatomaceous earth and 5 parts of water were stirred and mixed for 1 hour by weight to obtain a modifier; then, the modifier was mixed with 7 parts of lime powder and 60 Parts of phosphogypsum were sent to a cyclone dryer for mixing and drying. The drying temperature of the cyclone dryer was 60°C, and then collected by a dust bag to obtain a semi-finished retarder; finally, the semi-finished retarder was aged for 7 hours to obtain a retarder.

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Abstract

The invention discloses a phosphogypsum cement retarder, which comprises the following raw materials in parts by weight: 40-60 parts of phosphogypsum, 5-8 parts of lime powder, 2.0-3.0 parts of silane coupling agent, and 10-60 parts of modified diatomite. 15 parts and 3 to 5 parts of water, the present invention overcomes the deficiencies in the prior art, the modified diatomite in the cement retarder of the present invention can adsorb the coupling agent, and the coupling agent is to the modified diatomite. The adsorption of soluble phosphorus and fluorine has a strengthening effect, and the modified diatomite can react with soluble phosphorus and fluorine, reducing the content of soluble phosphorus and fluorine in the cement retarder; in addition, the modified diatomite enhances the cement The flexural strength and compressive strength of cement when the retarder is used in 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 the waste produced in the production of phosphate fertilizers. The output of phosphogypsum waste has gradually increased in recent years. Its main chemical composition is dihydrate gypsum (CaSO 4 2H 2 O), the mass is about 80% to 98%, and a small amount of impurities exist at the same time. The main use 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, and there are still organic phosphorus in phosphogypsum, so that the soluble phosphorus and fluorine contained in phosphogypsum can be directly added to cement , the soluble phosphorus and fluorine contained in it will delay the early hydration rate of cement, resulting in the inco...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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