Preparation of Reasonably Pure Calcium Orthophosphates from Wet-Process Phosphoric Acid. 1

Hale Gürbüz; Nusret A. Bulutçu

doi:10.1021/ie00044a044

Preparation of Reasonably Pure Calcium Orthophosphates from Wet-Process Phosphoric Acid. 1

Hale Gürbüz^*, Nusret A. Bulutçu

^*Corresponding author for this work

Department of Chemical Engineering

Istanbul Technical University

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

For preparing reasonably pure MCP·2H₂O and DCP·2H₂O from wet-process phosphoric acid, a neutralization process consisting of four consecutive steps and using Ca(OH)₂ as the neutralization agent is suggested and the optimum conditions of the first step are examined. The first step of the suggested process consists of removing sulfate ions, heavy metal ions, and suspended organic impurities. Removal of sulfate and heavy metal ions is carried out by neutralizing the acid with Ca(OH)₂ and by reacting it with Na₂S. Precipitated CaSO₄·1/2H₂O and heavy metal sulfides are removed from the acid by filtration. Removal of the suspended organic impurities takes place during the filtration since they are retained by the filter cake. It is found that sulfate removal of 98–99% and almost complete heavy metal and suspended organic impurity removals are performed when the weight ratios of Ca(OH)₂, Na₂S, and H₂O to wet-process phosphoric acid are 0.05, 0.02, and 0.2, respectively, at the neutralization temperature of 75–80 °C and with a reaction time of 2 h.

Original language	English
Pages (from-to)	1914-1918
Number of pages	5
Journal	Industrial and Engineering Chemistry Research
Volume	34
Issue number	5
DOIs	https://doi.org/10.1021/ie00044a044
Publication status	Published - 1 May 1995

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title = "Preparation of Reasonably Pure Calcium Orthophosphates from Wet-Process Phosphoric Acid. 1",

abstract = "For preparing reasonably pure MCP·2H2O and DCP·2H2O from wet-process phosphoric acid, a neutralization process consisting of four consecutive steps and using Ca(OH)2 as the neutralization agent is suggested and the optimum conditions of the first step are examined. The first step of the suggested process consists of removing sulfate ions, heavy metal ions, and suspended organic impurities. Removal of sulfate and heavy metal ions is carried out by neutralizing the acid with Ca(OH)2 and by reacting it with Na2S. Precipitated CaSO4·1/2H2O and heavy metal sulfides are removed from the acid by filtration. Removal of the suspended organic impurities takes place during the filtration since they are retained by the filter cake. It is found that sulfate removal of 98–99% and almost complete heavy metal and suspended organic impurity removals are performed when the weight ratios of Ca(OH)2, Na2S, and H2O to wet-process phosphoric acid are 0.05, 0.02, and 0.2, respectively, at the neutralization temperature of 75–80 °C and with a reaction time of 2 h.",

author = "Hale G{\"u}rb{\"u}z and Bulut{\c c}u, {Nusret A.}",

year = "1995",

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AU - Gürbüz, Hale

AU - Bulutçu, Nusret A.

PY - 1995/5/1

Y1 - 1995/5/1

N2 - For preparing reasonably pure MCP·2H2O and DCP·2H2O from wet-process phosphoric acid, a neutralization process consisting of four consecutive steps and using Ca(OH)2 as the neutralization agent is suggested and the optimum conditions of the first step are examined. The first step of the suggested process consists of removing sulfate ions, heavy metal ions, and suspended organic impurities. Removal of sulfate and heavy metal ions is carried out by neutralizing the acid with Ca(OH)2 and by reacting it with Na2S. Precipitated CaSO4·1/2H2O and heavy metal sulfides are removed from the acid by filtration. Removal of the suspended organic impurities takes place during the filtration since they are retained by the filter cake. It is found that sulfate removal of 98–99% and almost complete heavy metal and suspended organic impurity removals are performed when the weight ratios of Ca(OH)2, Na2S, and H2O to wet-process phosphoric acid are 0.05, 0.02, and 0.2, respectively, at the neutralization temperature of 75–80 °C and with a reaction time of 2 h.

AB - For preparing reasonably pure MCP·2H2O and DCP·2H2O from wet-process phosphoric acid, a neutralization process consisting of four consecutive steps and using Ca(OH)2 as the neutralization agent is suggested and the optimum conditions of the first step are examined. The first step of the suggested process consists of removing sulfate ions, heavy metal ions, and suspended organic impurities. Removal of sulfate and heavy metal ions is carried out by neutralizing the acid with Ca(OH)2 and by reacting it with Na2S. Precipitated CaSO4·1/2H2O and heavy metal sulfides are removed from the acid by filtration. Removal of the suspended organic impurities takes place during the filtration since they are retained by the filter cake. It is found that sulfate removal of 98–99% and almost complete heavy metal and suspended organic impurity removals are performed when the weight ratios of Ca(OH)2, Na2S, and H2O to wet-process phosphoric acid are 0.05, 0.02, and 0.2, respectively, at the neutralization temperature of 75–80 °C and with a reaction time of 2 h.

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DO - 10.1021/ie00044a044

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JO - Industrial and Engineering Chemistry Research

JF - Industrial and Engineering Chemistry Research

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ER -

Preparation of Reasonably Pure Calcium Orthophosphates from Wet-Process Phosphoric Acid. 1

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