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A kind of preparation method of phosphogypsum-based high-energy long-acting expansion agent

A phosphogypsum and gypsum-based technology, applied in the field of material science and engineering, can solve the problems of large differences in phosphogypsum impurities, poor product performance, and many impurities, and achieve the effects of small impact, high expansion energy, and high expansion rate.

Inactive Publication Date: 2017-06-13
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are many impurities in phosphogypsum (fluoride, free phosphoric acid, P 2 o 5 , phosphate, etc.), the impurities in phosphogypsum produced by different minerals vary greatly, and the impurities they contain are not only the main factors that cause environmental pollution during the storage of phosphogypsum, but also cause complex pretreatment processes in the utilization of phosphogypsum. Problems such as poor product performance limit the large-scale application of phosphogypsum. Therefore, in-depth research and exploration are urgently needed in the pretreatment process and utilization methods of phosphogypsum

Method used

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  • A kind of preparation method of phosphogypsum-based high-energy long-acting expansion agent
  • A kind of preparation method of phosphogypsum-based high-energy long-acting expansion agent
  • A kind of preparation method of phosphogypsum-based high-energy long-acting expansion agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Pretreatment and calcination of phosphogypsum

[0019] a. Mix phosphogypsum, calcium oxide, and water according to the mass ratio of 1:3:2, and let it stand for 24 hours to make phosphogypsum slurry;

[0020] b. Put the phosphogypsum paste in a high-temperature furnace at 170°C, keep it warm for 3 hours, and after cooling to room temperature, put it in a ball mill, and powder until the surface area is 250m 2 / kg fineness to produce anhydrous phosphogypsum;

[0021] c. Put the phosphogypsum slurry in a high-temperature furnace at 370°C, keep it warm for 4 hours, and place it in a ball mill until the surface area of ​​the powder is 300m 2 / kg fineness to obtain soluble phosphogypsum;

[0022] (2) Calcination of magnesium hydroxide

[0023] a. Place magnesium hydroxide in a high-temperature furnace at 900°C for 2 hours. After cooling to room temperature, place it in a ball mill until the powder has a surface area of ​​280m 2 / kg fineness to produce light-burned mag...

Embodiment 2

[0035] (1) Pretreatment and calcination of phosphogypsum

[0036] a. Mix phosphogypsum, calcium oxide, and water according to the mass ratio of 1:3:2, and let it stand for 24 hours to make phosphogypsum slurry;

[0037] b. Put the phosphogypsum slurry in a high-temperature furnace at 170°C for 3.2 hours. After cooling to room temperature, place it in a ball mill until the surface area of ​​the powder is 270m 2 / kg fineness to produce anhydrous phosphogypsum;

[0038] c. Put the phosphogypsum slurry in a high-temperature furnace at 370°C, keep it warm for 4.7 hours, and place it in a ball mill until the powder has a surface area of ​​330m 2 / kg fineness to obtain soluble phosphogypsum;

[0039] (2) Calcination of magnesium hydroxide

[0040] a. Put magnesium hydroxide in a high-temperature furnace at 900°C, keep it warm for 2.4 hours, and after cooling to room temperature, place it in a ball mill until the powder has a surface area of ​​290m 2 / kg fineness to produce light-...

Embodiment 3

[0052] (1) Pretreatment and calcination of phosphogypsum

[0053] a. Mix phosphogypsum, calcium oxide, and water according to the mass ratio of 1:3:2, and let it stand for 24 hours to make phosphogypsum slurry;

[0054] b. Put the phosphogypsum slurry in a high-temperature furnace at 170°C, keep it warm for 4 hours, and after cooling to room temperature, put it in a ball mill, and powder until the surface area is 300m 2 / kg fineness to produce anhydrous phosphogypsum;

[0055] c. Put the phosphogypsum slurry in a high-temperature furnace at 370°C, keep it warm for 5 hours, and place it in a ball mill until the surface area of ​​the powder is 350m 2 / kg fineness to obtain soluble phosphogypsum;

[0056] (2) Calcination of magnesium hydroxide

[0057] a. Place magnesium hydroxide in a high-temperature furnace at 900°C for 3 hours. After cooling to room temperature, place it in a ball mill until the surface area of ​​the powder is 300m 2 / kg fineness to produce light-burned m...

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Abstract

The invention relates to a preparation method of a phosphogypsum-based high-energy long-acting expansion agent. Anhydrous phosphogypsum, soluble phosphogypsum, light-burned magnesia, dead-burned magnesia, metakaolin, and sodium silicate are prepared in a mass ratio of 50 to 100: 50-100: 20-40: 30-60: 100-150: 2-5 are uniformly mixed to prepare a high-energy long-acting expansion agent for phosphogypsum. The benefit of the present invention is that it can realize expansion at different times and for a long time. In addition, the expansion agent contains a variety of expansion components with high expansion energy. Under the combined effect, high-energy and long-term expansion can be realized. Concrete performance is shown in the table below, as can be seen from the result, this expansive agent has a high expansion rate and has little influence on concrete strength, and taking the expansion agent dosage of the present invention at 3.5% as an example, its 90d and 180d limiting expansion rates are 1.20% and 180d respectively. 1.21%, indicating that it has long-term volume stability.

Description

technical field [0001] The invention belongs to the field of material science and engineering, and in particular relates to a preparation method of a phosphogypsum-based high-energy long-acting expansion agent. Background technique [0002] For a long time, most enterprises in our country have used the stockpiling method to dispose of phosphogypsum, and the comprehensive utilization rate is less than 10%. This law not only occupies a large amount of land, but also easily causes environmental pollution, especially for enterprises that are close to environmentally sensitive areas such as rivers, rivers, lakes, and seas, and the pressure on environmental protection is even greater. Therefore, how to do a good job in the comprehensive utilization and harmless treatment of phosphogypsum has become the key to whether my country's phosphate fertilizer industry can achieve sustainable development. [0003] A lot of research work has been carried out on the application of phosphogyp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B22/14
Inventor 徐慢沈凡孙政季家友王树林曹宏石和彬薛俊陈常连
Owner WUHAN INSTITUTE OF TECHNOLOGY