METHOD OF POROUS GRANULATED AMMONIUM NITRATE PRODUCING AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2016 - IPC C06B21/00 

FIELD: technological processes.

SUBSTANCE: invention relates to production of porous granulated ammonium nitrate to be used at explosive substances manufacture points on enterprises, conducting blasting operations. Invention can be used in open and underground method of ore and nonmetallic solid mineral resources production, at formation, stockwork, gangue deposits development. Method of porous granulated ammonium nitrate producing involves granulated ammonium nitrate thermal processing, wherein granular ammonium nitrate is treated in two stages, first stage involves granulated ammonium nitrate thermal treatment primary stage by heating in rotary drum to temperature of 32.3-50 °C, thermal treatment secondary stage is carried out at this temperature in drum oscillation mode, and granulated ammonium nitrate heating in drum is performed mainly alternately either in rotation, or in oscillation mode, wherein after nitrate heating and conditioning it is spread with separation into fractions. Device for production of porous granulated ammonium nitrate comprises drum installed at angle α to horizon, with hollow axis, made with jacket for liquid heat carrier and possibility of liquid heat carrier circulation along drum axis, proportioning feeder and loading manifold for supply of granulated ammonium nitrate into drum, distribution head pieces, unloading hatch, unloading device with separate output of fractions, external heat-protective shell with inspection hatch, exhaust devices for air removal from heat-protective shell, and sieve mounted on drum unloading end side, made in form of perforated ring with elliptic shaped discharge opening with ellipse greater axis to smaller ratio equal to 1.7-2.2, and ellipse center offset relative to drum axis of not less than ellipse size by smaller axis, and drum itself is made with possibility of rotation around its axis in at least two modes: either in rotation mode, or in oscillation mode.

EFFECT: invention provides improved quality of ammonium nitrate granules structure changing (pore generation), providing elementary explosives with higher stability and improved explosive properties.

2 cl, 3 dwg