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Method for producing phosphorus building gypsum by phosphorous gypsum

A technology of phosphogypsum and phosphogypsum, applied in the field of phosphogypsum to produce phosphogypsum, to achieve the effects of reducing environmental pollution, saving production costs, and high economic benefits

Active Publication Date: 2013-09-04
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are technologies for phosphogypsum utilization and treatment in the prior art, there are still many problems in the utilization of phosphogypsum, and there are no literature reports on the production of phosphogypsum with phosphogypsum at low cost.

Method used

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  • Method for producing phosphorus building gypsum by phosphorous gypsum
  • Method for producing phosphorus building gypsum by phosphorous gypsum
  • Method for producing phosphorus building gypsum by phosphorous gypsum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for producing phosphogypsum from phosphogypsum, which is to dry industrial waste phosphogypsum (after removing large pieces or crushing large pieces) through an airflow dryer until the moisture content (mass percentage, the same below) is less than 5%, and then send to Enter the steam jet mill, pass through the steam jet mill for grinding and dehydration, and then collect and cool through the dust collector to obtain phosphorus building gypsum;

[0025] Phosphorus building gypsum, its standard consistency (the mass percentage of water and gypsum added when reaching the specified fluidity) is 68%, the initial setting time is 6 minutes, the final setting time is 12 minutes, the 2h flexural strength is 2.73MPa, and the 2h compressive strength is 5.52MPa.

[0026] In the preparation method: the steam pressure is 0.813MPa, the steam temperature is 275°C, and the frequency of the powder classifier is 10Hz. After the industrial waste phosphogypsum is ground and dehydra...

Embodiment 2

[0029] A method for producing phosphogypsum from phosphogypsum, which is: drying industrial waste phosphogypsum (after removing large pieces or crushing large pieces) through an airflow dryer until the moisture content is less than 5%, and then sending it into a steam jet mill, passing through After being ground and dehydrated by the steam jet mill, it is collected by the dust collector and cooled to obtain phosphorus building gypsum;

[0030] Phosphorus building gypsum has a standard consistency of 71%, an initial setting time of 9 minutes, a final setting time of 12 minutes, a 2-hour flexural strength of 2.54 MPa, and a 2-hour compressive strength of 4.65 MPa.

[0031] In the preparation method: the steam pressure is 0.813MPa, the steam temperature is 260°C, and the frequency of the powder classifier is 10Hz. After the industrial waste phosphogypsum is ground and dehydrated under these conditions, it is collected by a dust collector and cooled to obtain phosphorus building gy...

Embodiment 3～9

[0034] A method for producing phosphogypsum from phosphogypsum, which is: drying industrial waste phosphogypsum (after removing large pieces or crushing large pieces) through an airflow dryer until the moisture content is less than 5%, and then sending it into a steam jet mill. The superheated steam temperature is 250℃~300℃, the frequency of the classifier of the steam jet mill is 10Hz~40Hz, and the steam pressure (ie gauge pressure) is 0.7MPa~1.2MPa, the industrial waste phosphogypsum is pulverized by the steam jet mill After being ground and dehydrated, it is collected in a dust collector and cooled to obtain phosphorus building gypsum;

[0035] Concrete condition and parameter in embodiment 3~9 see the following table:

[0036]

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Abstract

The invention discloses a method for producing phosphorus building gypsum by phosphorous gypsum. The method is characterized by comprising the following steps of drying industrial residual phosphorous gypsum by a pneumatic drier to a state that water content is smaller than 5%; sending the dried phosphorous gypsum to a steam jet mill, grinding the industrial residual phosphorous gypsum by the steam jet mill and dewatering, collecting the grinded phosphorous gypsum by a dust collector and cooling the phosphorous gypsum to obtain the phosphorus building gypsum, wherein the power medium of the steam jet mill is superheated steam; a frequency of a powder concentrator is 10 Hz-40 Hz; the temperature of the superheated steam is 250 DEG C-300 DEG C; and a pressure of the superheated steam is 0.7 MPa-1.2 MPa. In the method, the industrial residual phosphorous gypsum is used as a raw material; the superheated steam generated by industrial waste heat is used as a power for the steam jet mill to prepare the phosphorus building gypsum. The method has the characteristics of wide available raw materials, simple production equipment, high yield, low cost, large-scale production, etc. The prepared phosphorus building gypsum can be used for preparing building functional mortar and producing gypsum boards and building blocks, and has strong practicality.

Description

technical field [0001] The invention belongs to the preparation of phosphogypsum and relates to a method for producing phosphogypsum from phosphogypsum. The phosphorous building gypsum prepared by the invention can be widely used in the preparation of building functional mortar, including bonding gypsum, gypsum-based putty, plastering gypsum or other aspects, and can also be used to produce gypsum boards and blocks. Background technique [0002] Phosphogypsum is a by-product of sulfuric acid extraction of phosphoric acid, and the production of 1 ton of phosphoric acid (calculated as P205) requires the discharge of 4.5 to 5.5 tons of phosphogypsum. The stacking of phosphogypsum not only occupies a large amount of land resources, but also pollutes the atmosphere, water system and soil due to wind erosion and rain erosion, and the construction cost of phosphogypsum storage yard is also quite expensive. In the 2009 Energy Conservation and Emission Reduction Work Plan of the Sta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B11/26
Inventor 陈德玉刘元正严云胡志华刘路珍
Owner SOUTHWEAT UNIV OF SCI & TECH
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