Defluorination kiln restriction control agent and method
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United States of America Patent
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-
Dec 29, 1987
Grant Date -
N/A
app pub date -
Jan 22, 1986
filing date -
Jan 22, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An improved process for the thermal defluorination of phosphate rock is provided. The process comprises adding ammonia to the phosphoric acid fed to the kiln, the amount of ammonia added being effective for forming a eutectic with the fused ring and ball materials and heating the mixture with agitation to defluorinating temperatures for a period of time sufficient to defluorinate the rock and recovering the defluorinated rock.
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