Impurity occlusion in DCP production

✍ Scribed by S. Sarig; H. Zalcman; D. Greidinger

• Publisher: Elsevier Science
• Year: 1977
• Tongue: English
• Weight: 564 KB
• Volume: 32
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(77)80230-3

✦ Synopsis

The producbon of d~calcmm phosphate (DCP) from sohd phosphate, hydrochlonc acid and calcium carbonate was sunulated m bench scale expenments Occasionally the drssolution of cakmm carbonate partjcles was mterrupted at h&y ac~dlc medmm and sometunes the carbonate was mcorporated m the product It was found that whenever the concentration of fluonde was sulliclent, calcmm fluonde preclprtated upon calcmm carbonate parkles fonnmg a protective envelope Such parkles. pnor to the redlssoluhon of the envelope, could act as substrates for heterogeneous nucleation of the snnultaneously preclpltatmg d~cakmm phosphate They were mcorporated m the product at the start of DCP formation, when only about half of the acidity was neutralized