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Method for producing diammonium phosphate from recycled phosphorus-containing filter residues
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A diammonium phosphate, resource-based technology, applied in the field of ammonium phosphate, to promote development and realize the effect of diversifying product specifications
Active Publication Date: 2014-02-26
WENGFU (GRP) CO LTD
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[0003] After searching, there is currently no related method in the Chinese patent database that utilizes wet-process phosphoric acid to purify raffinate to produce crystalline monoammonium residues as resources and use them for the production of diammonium phosphate
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Embodiment 1
[0023] Wet recycling:
[0024] (1) Put the filter residue and mother liquor from the crystalline monoammonium phosphate unit into the re-slurry tank, add concentrated phosphoric acid, colorant, and condensate at the same time, and under the enhanced mass transfer action of the agitator, the filter residue is diluted by phosphoric acid, acidolysis, and coloring; Slurry with low density, ρ=1.26 g / ml, is stored in the buffer storage tank for later use; a filter filter is installed on the pipeline through which the filter residue passes to prevent it from carrying solid impurities into the production system;
[0026] project N P 2 o 5 SO 4 2- Mg 2+ Fe 3+ SiO 2 Al 3+ F - Solid content Value (%) 2.32 20.34 2.07 1.38 0.28 0.17 0.19 0.27 3.47
[0027] (2) During the production of the diammonium phosphate plant, according to the production loa...
Embodiment 2
[0039] An ammonium phosphate factory adopts the method of the present invention to implement dry method and wet method.
[0040] The method of wet recovery is with embodiment 1; Wherein:
[0041]In step (2), the volumetric flow rate of the slurry is q v =8m 3 / h is released to the washing liquid recovery pool; in step (3), adjust the density of the acid distribution tank of the tubular reactor to 1.55g / ml, and transport it to the tubular reactor through the tube back acid pump. Vigorous neutralization reaction occurs in the reactor to generate high temperature and high pressure (T=135°C, P=0.55Mpa) ammonium phosphate slurry, which is sprayed onto the material bed of the granulator by its own pressure;
[0042] In step (4), ammonium phosphate slurry with a density of ρ=1.55 g / ml and a degree of neutralization (N / P)=1.55 is generated, and its temperature is T=125°C. The generated ammonium phosphate slurry is transported by the slurry pump and can be sprayed on the material be...
Embodiment 3
[0046] An ammonium phosphate factory adopts the method of the present invention to implement dry method and wet method.
[0047] The method of wet recovery is with embodiment 1; Wherein:
[0048] In step (2), the volumetric flow rate of the slurry is q v =5m 3 / h is released to the washing liquid recovery pool;
[0049] In step (3), adjust the density of the acid tank of the tubular reactor to 1.48g / ml, and transport it to the tubular reactor through the pipe back acid pump, and undergo a violent neutralization reaction with liquid ammonia in the tubular reactor. Generate high-temperature and high-pressure (T=130°C, P=0.50Mpa) ammonium phosphate slurry, which is sprayed onto the material bed of the granulator by virtue of its own pressure;
[0050] In step (4), ammonium phosphate slurry with a density of ρ=1.5 g / ml and a degree of neutralization (N / P)=1.5 is generated, and its temperature is T=115°C. The generated ammonium phosphate slurry is transported by the slu...
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Abstract
The invention discloses a method for producing diammonium phosphate from recycled phosphorus-containing filter residues, which comprises the following two implementation modes: wet-process recycling and dry-process addition. The wet-process recycling comprises the following steps: transferring centrifugally separated phosphorus ammonium filter residues to a repulping tank, and introducing a monoammonium phosphate plant condensate and concentrated phosphoric acid, mixing the condensate and the concentrated phosphoric acid with the filter residues to acidolyze and dilute the filter residues, thereby forming a low-concentration pulp; and recycling the low-concentration pulp into a diammonium phosphate preneutralization reactor and a tubular reactor acid blending tank for phosphoric acid neutralized pulp preparation, jetting, ammonification and granulation. The dry-process addition is implemented in a way that: by fully utilizing the powder recycling and addition facility of the diammonium phosphate device, the dried filter residues are treated and transferred into a phosphoric acid return system through an underground receiving hopper and a conveyer belt, and enter a rotating drum ammonification granulator to perform coating granulation with the phosphorus ammonium neutralization pulp. The invention promotes the recycling of the crystalline monoammonium phosphate byproduct filter residues by fully utilizing the existing facility of the diammonium phosphate device, and produces the high-quality diammonium phosphate, thereby promoting the development of circular economy.
Description
technical field [0001] The invention relates to ammonium phosphate, in particular to a method for producing granular diammonium phosphate from phosphorus-containing filter residue discharged from the filtration and separation process of crystal monoammonium phosphate by purifying by-product raffinate with wet-process phosphoric acid. Background technique [0002] The by-product of wet-process phosphoric acid purification - raffinate acid is used to produce crystalline monoammonium phosphate, and the filter residue (MDAP, monoammonium phosphate, diammonium phosphate) discharged from the filtration process still contains rich nitrogen, phosphorus and other effective element resources, making full use of existing There are devices to realize the recovery and recycling of resources, which can be used to produce fertilizer-grade diammonium phosphate, which can promote the development of circular economy. [0003] After searching, there is currently no related method in the Chines...
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