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Method utilizing microwave technique to induce modified ardealite

A phosphogypsum and modification technology, applied in the field of using microwave technology to induce modification of phosphogypsum, can solve problems such as no breakthrough research on phosphogypsum, achieve good economic benefits, environmental and social benefits, broaden utilization channels, and save energy. Effect

Inactive Publication Date: 2012-10-03
KUNMING UNIV OF SCI & TECH
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There is no breakthrough research on the modification of phosphogypsum by microwave technology at home and abroad

Method used

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  • Method utilizing microwave technique to induce modified ardealite
  • Method utilizing microwave technique to induce modified ardealite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Ball mill 100g of phosphogypsum to 160 mesh, then add 10g of inorganic metal oxide Fe 2 After mixing O, place it under the conditions of microwave frequency 2350MHZ, power 750w, and temperature 100°C for 10 minutes, then cool naturally to room temperature to obtain microwave-induced modified phosphogypsum.

Embodiment 2

[0028] Ball mill 100g of phosphogypsum to 180 mesh, then add 5g of inorganic metal oxide Al 2 o 3 After mixing, microwave treatment was performed under the conditions of microwave frequency 2350MHZ, power 850w, and temperature 120°C for 12 minutes, and then naturally cooled to room temperature to obtain microwave-induced modified phosphogypsum.

Embodiment 3

[0030] Ball mill 100g of phosphogypsum to 200 mesh, then add 2.5g of inorganic metal oxide Al 2 o 3 After mixing, microwave treatment was carried out under the conditions of microwave frequency 2350MHZ, power 950w, and temperature 150°C for 15 minutes, and then naturally cooled to room temperature to obtain microwave-induced modified phosphogypsum.

[0031]

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PUM

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Abstract

The invention provides a method utilizing a microwave technique to induce modified ardealite. The method comprises the following steps of: ball-milling the ardealite to 160-200meshes; according to the mass ratio of the ardealite and an amorphous dielectric material being 1-2: 0.05-0.1, adding the amorphous dielectric material to be mixed; putting the mixture under the conditions of 2350MHz of microwave frequencies, 750-950W of power and 100-150 DEG C of temperature to carry out microwave processing for 10-15 minutes, and then naturally cooling to the room temperature; and finally obtaining microwave induced modified ardealite. According to the method, the surface free energy, the electric potential, the average pore size and the specific surface area of the ardealite can be significantly increased. The prepared microwave induced modified ardealite can be used for adsorption of heavy metal wastewater. The method has the advantages of simple operation, low cost and high efficiency, a lot of energy sources are saved, and the secondary pollution is avoided.

Description

technical field [0001] The invention relates to the technical field of modification and utilization of phosphogypsum, in particular to a method for inducing modification of phosphogypsum by microwave technology. Background technique [0002] Phosphogypsum is a solid waste produced during the wet process of phosphoric acid production, and its main component is CaSO 4 2H 2 O, also contains some H 3 PO 4 , Ca(H 2 PO 4 ) 2 ·H 2 O, CaHPO 4 2H 2 O, Ca 3 (PO 4 ) 2 and sulfides (NaF, Na 2 SiF 6 、Na 3 AlF 6 、Na 3 FeF 6 , CaF 2 ). At present, the comprehensive utilization rate of phosphogypsum in my country is only 15%. More than 100 million tons of phosphogypsum have been accumulated in the whole country, and it is increasing at a rate of 20 million tons every year. In Yunnan Province alone, more than 40 million tons of phosphogypsum have been accumulated. In May 2006, the State Environmental Protection Administration classified phosphogypsum as a hazardous solid...

Claims

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Application Information

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IPC IPC(8): C04B11/26
Inventor 杨月红舒敦涛张怀予
Owner KUNMING UNIV OF SCI & TECH
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