Process for the thermal treatment of ammonium nitrate for manufacturing ANFO and heavy ANFO
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United States of America Patent
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Aug 25, 2015
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Jul 31, 2014
filing date -
Jul 31, 2014
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Abstract
A method of thermally treating high density ammonium nitrate for manufacturing ANFO and heavy ANFO including loading high density ammonium nitrate into a tank; entering the high density ammonium nitrate into heating equipment at room temperature; heating the high density ammonium nitrate inside the heating equipment; removing the treated ammonium nitrate from the heating equipment at a temperature less than 60° C.; and sieving the treated ammonium nitrate, thereby obtaining thermally treated ammonium nitrate; feeding thermally treated ammonium nitrate at a temperature of less than 30° C. into a mixing chamber while injecting fuel into the thermally treated ammonium nitrate feeding pipe, thereby obtaining ANFO; loading gassed or ungassed bulk emulsion into a hopper; feeding the bulk emulsion into the same mixing chamber as the ANFO; and mixing the bulk emulsion and the ANFO, thereby obtaining heavy ANFO.
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