Study on Influence Factors of Co-Crystallized P2O5 in Phosphogypsum Formation and its Mechanism

Abstract:

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Influence factors of co-crystallized (lattice) P2O5 were investigated from the dihydrate process conditions and aimed to optimize the process conditions and reduce the co-crystallized (lattice) P2O5 content in phosphogypsum. It is found that: 1) reaction temperature, P2O5 concentration in liquid phase and SO3 concentration in liquid phase are main factors influencing the content of co-crystallized (lattice) P2O5; 2) increasing the reaction temperature, can reduce the supersaturation ratio of the crystallization, decrease the solution viscosity, which help ions diffusion and reduce the content of co-crystallized (lattice) P2O5; 3) improvement of SO3 concentration in liquid phase can increase the collision probability between calcium sulfate lattice and SO42-, reduce the Ca2+ concentration and prevent the dissociation of phosphoric acid, so HPO42- concentration does not increase, thereby reducing content of co-crystallized (lattice) P2O5; 4) increasing the P2O5 concentration in liquid phase will lead to a corresponding increase of the HPO42- concentration, solution viscosity increasing, diffusion problems, and deterioration of crystallization conditions, which increased the content of co-crystallized (lattice) P2O5; 5) the formation mechanism of co-crystallized (lattice) P2O5 is: any changes in the reaction system whatever can make the local concentration or average concentration of Ca2+ and HPO42- in the solution increased, will increase the probability of the formation of co-crystallized (lattice) P2O5.

Info:

Periodical:

Advanced Materials Research (Volumes 287-290)

Edited by:

Jinglong Bu, Pengcheng Wang, Liqun Ai, Xiaoming Sang, Yungang Li

Pages:

1102-1107

DOI:

10.4028/www.scientific.net/AMR.287-290.1102

Citation:

M. Li et al., "Study on Influence Factors of Co-Crystallized P2O5 in Phosphogypsum Formation and its Mechanism", Advanced Materials Research, Vols. 287-290, pp. 1102-1107, 2011

Online since:

July 2011

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Price:

$35.00

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