Method for producing building gypsum from modified phosphorus gypsum

A technology of building gypsum and phosphogypsum, applied in the directions of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of polluting the environment and the accumulation of phosphogypsum like mountains, reducing calcination temperature, improving performance and market capacity. huge effect

Inactive Publication Date: 2008-09-17
YUNNAN MINZU UNIV
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Problems solved by technology

If an active material and method for highly efficient modification of phosphogypsum can be found, it is expected to solve t

Method used

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Experimental program
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Embodiment 1

[0021] Embodiment 1: The mass percent of main chemical components of phosphogypsum is: CaO 35.36%, SO 2 47.12%, Fe 2 o 3 3.01%, Al 2 o 3 2.05%, P 2 o 5 1.20%, F 0.06%, SiO 2 11.20%; the main chemical component mass percentage of calcium carbide slag is Ca(OH) 2 45.27%, CaCO 3 0.5%, total calcium 15%, moisture 37.60%, MgO 0.3%, Fe 2 o 3 0.08%, Al 2 o 3 1.25%, the phosphogypsum, carbide slag, Al 2 o 3 and rare earth metal lanthanum were dried at 98°C for 2 hours, and the phosphogypsum and carbide slag were ball-milled until the particle size was less than or equal to 76 μm, accounting for more than 90%. The ball-milled phosphogypsum and carbide slag and the purchased powdery Al 2 o 3 , Rare earth metal lanthanum is blended in a ratio of 81:14:4:1 by weight, stirred continuously for 15 minutes to obtain a uniformly mixed powdery material, heated to 200°C, and pressed into granules with a particle size of 4 to 5mm by an extrusion granulator The granular material ob...

Embodiment 2

[0022]Embodiment 2: The mass percent of main chemical components of phosphogypsum is: CaO=37%, SO 2 =50.17%, Fe 2 o 3 =0.1%, Al 2 o 3 =0.59%, P 2 o 5 =1.01%, F=0.01%, SiO 2 =11.12%; the main chemical composition mass percentage of calcium carbide slag is Ca(OH) 2 47.31%, CaCO 3 1.01%, total calcium 14.6%, moisture 35.4%, MgO 0.2%, Fe 2 o 3 0.06%, Al 2 o 3 1.42%, the phosphogypsum, carbide slag, Al 2 o 3 , rare earth metal cerium were dried at 100°C for 2 hours, and the phosphogypsum and carbide slag were ball-milled until the particle size was less than or equal to 76 μm, accounting for more than 90%. The ball-milled phosphogypsum and carbide slag and the purchased powdery Al 2 o 3 , Rare earth metal lanthanum is blended in a ratio of 83:13:3:1, continuously stirred for 10 minutes to obtain a uniformly mixed powdery material, heated to 180°C, and pressed into a granular material with a particle size of 4 to 5mm by an extrusion granulator, Send the granular mate...

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Abstract

The invention relates to a method for producing construction gypsum from modified phosphogypsum, which belongs to the technology field of phosphorus chemical industry. The raw materials of phosphogypsum and carbide slag are pulverized and then mixed with Al2O3 and rare earth metal as modifiers, at a weight ratio of (76-88) :(5-15):(3-10):(0.5-1.5), the resulted mixture is granulated and modified by calcination process free of water washing, under such conditions that the calcination temperature is controlled at 150-300 DEG C and the calcination time is 20-30 minutes, and then discharged to obtain modified phosphogypsum. The product performance meets and complies with the premium grade in GB9776-88 standards 'Construction Gypsum'. Additionally, the invention has the advantages that: the modification process has short treatment time and low energy consumption, the invention realizes the reasonable utilization of phosphogypsum resources, and the invention is significant in solving the problems of land occupation and environmental pollution in phosphogypsum storage.

Description

1. Technical field: [0001] The invention relates to a method for producing building gypsum from modified phosphogypsum, which belongs to the technical field of phosphorus chemical industry preparation. 2. Background technology: [0002] Phosphogypsum is an important basis for ensuring national food security, and phosphogypsum is an inevitable product of the production of phosphogypsum. The emission of phosphogypsum in the world exceeds 280 million tons, and the annual emission of phosphogypsum in my country exceeds 22 million tons. The utilization rate of gypsum does not exceed 10%, and the disposal and comprehensive utilization of phosphogypsum has become a worldwide problem. The stacking of phosphogypsum not only occupies a large amount of land and pollutes the environment, but also brings a great economic burden to the production enterprises. Whether the comprehensive utilization of phosphogypsum has become one of the key factors restricting the sustainable development of ...

Claims

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Application Information

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IPC IPC(8): C04B11/26
CPCC04B11/26C04B28/143Y02W30/91C04B14/30C04B14/303C04B18/142C04B20/0076
Inventor 马林转宁平卿山杨月红杨敏刘天成
Owner YUNNAN MINZU UNIV
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