磷酸氢钙结晶聚结过程及主要影响杂质的探究

doi:10.11962/1006-4990.2020-0107

Abstract

Abstract:

Agglomeration phenomenon often occurs in the reaction crystallization process,which is one of the main factors af-fecting the particle size,morphology and other properties of the product.Focusing on the agglomeration phenomenon of calci-um hydrogen phosphate,the process steps of agglomeration were analyzed,and the main impurities that hinder the agglomera-tion in industrial production were explored.The results showed that large,uniform and stable calcium hydrogen phosphate particles were obtained by using pure dilute phosphoric acid as raw material.The large-size aggregates undergone three key growth steps: single crystals agglomeration,small-size cluster crystals agglomeration and large-size cluster spherical crystal morphology formation.The colloidal particles containing fluorine in crystallization mother solution blocked the second step of agglomeration and became the most important factor to prevent agglomeration.Exploring the technological method of rationally utilizing the agglomeration phenomenon will open up a new way to solve the problems of difficult filtration and high drying cost in the industrial production of feed-grade calcium hydrogen phosphate.

Key words: large-size particles of calcium hydrogen phosphate, agglomeration, colloidal particles containing fluorine, crystallization

CLC Number:

TQ132.32

Cao Weiwen,Li Jun,Chen Ming,Yu Yinrong,Liao Xiaoting. Study on agglomeration process during crystallization of calcium hydrogen phosphate and its main affecting impurity thereof[J]. Inorganic Chemicals Industry, 2021, 53(1): 50-53.

Figures/Tables 8

References 10

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实验序号	w（SO₄^2-）	w（Mg²⁺）	w（Na⁺）	w（F^-）
初级实验	极微量	60.0	6.9	3.0
2	624.3	—	—	—
3	—	2 218.9	—	—
4	—	—	934.7	—
5	—	—	—	84.5

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Inorganic Acid-Base-Salt Committee of CIESC

Study on agglomeration process during crystallization of calcium hydrogen phosphate and its main affecting impurity thereof

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