Ammonium phosphate slurry filtering device and cleaning method thereof

Abstract

The invention relates to the technical field of ammonium phosphate slurry filtration, in particular to an ammonium phosphate slurry filtering device and a cleaning method thereof. The filtering device comprises a cylinder, a porous pipe plate, a filter bag, a filtrate removal notch, an ammonium phosphate slurry inlet and an aeration hole; the porous pipe plate is arranged inside the cylinder, and pores in the porous pipe plate are communicated with a bag mouth of the filter bag; the filtrate removal notch is formed in the side wall, close to the top, of the cylinder; the ammonium phosphate slurry inlet and the aeration hole are respectively formed in the side wall, close to the bottom, of the cylinder, so that the filtration amount of ammonium phosphate slurry is large, the filtering effect is higher, the energy consumption is low, and the operation and maintenance cost is lower; through aeration and cleaning with a sodium hydroxide solution, a residue layer attached onto the outer surface of the filter bag is loose, the cleaning difficulty is lower, the cleaning period is shortened, and the service life of equipment is prolonged.

Description

technical field [0001] The invention relates to the technical field of ammonium phosphate slurry filtration, in particular to an ammonium phosphate slurry filtration device and a cleaning method for the device. Background technique [0002] A large amount of solid sedimentation sludge will be precipitated during the static sedimentation process of dihydrate wet phosphoric acid, and most of the solid phase in the sludge is phosphogypsum and (Fe, Al) 3 K H 14 (PO 4 ) 8 4H 2 O complex, in addition, wet-process phosphoric acid contains a lot of soluble impurities, such as Mg 2+ , Ca 2+ , Fe 3+ 、Al 3+ , SO 4 2- and SiF 6 2- etc. During the neutralization reaction between wet-process phosphoric acid and ammonia, these impurities will generate a variety of complex compounds, which will seriously affect the viscosity of the slurry and the composition, physical properties and P of ammonium phosphate products. 2 o 5 Solubility etc. The use of wet-process phosphoric acid ...

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Problems solved by technology

However, the device is set based on the characteristics of the ammonium phosphate slurry itself, so as to overcome the defects of the existing filter devices; however, the cleaning methods of the existing filter equipment after filtration and separation are relatively simple, and most of them use Clean water is used for flushing, and in this device, the filter bag of the filter part is attached with a large amount of slag layer. It is difficult to restore the filtering capacity of the filter device by cleaning with clean water, which shortens the service life of the filter device and lowers the filtration capacity.

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