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Increasing fluosilicic acid evolution from phosphate rock by digestion with phosphoric acid.

Authors
Blake-HE Jr.; Nash-BD
Source
NTIS: PB 240 099 :1-16
Link
NIOSHTIC No.
10009307
Abstract
The Bureau of Mines has been engaged in a continuing research effort to develop processes for increasing the recovery and utilization of fluorine from low-grade resources. This current research has shown that over 98 percent of the fluorine in phosphate rock is extracted when the ore is treated with excess phosphoric acid in the presence of water vapor at 150 deg to 180 deg c. More than 80 percent of the fluorine can be recovered as fluosilicic acid, which can then be converted to commercially useful hydrogen fluoride or fluorspar by previously developed Bureau processes. Extraction of p2o5 from the ore was about 98 percent in batch tests and 90 percent in semicyclic tests.
Publication Date
19740101
Document Type
IH; Report of Investigations
Fiscal Year
1974
NTIS Accession No.
PB-240099
NTIS Price
A03
Identifying No.
RI-7980
NIOSH Division
ALRC
Source Name
NTIS: PB 240 099
State
OR
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