Phosphoric acid purification and arsenic removal device
A technology for removing arsenic and phosphoric acid, applied in phosphorus compounds, inorganic chemistry, chemical instruments and methods, etc., can solve the problems of increased risk of hydrogen sulfide leakage, increased difficulty of safety control, and can only be used in downgraded use, so as to reduce the risk of leakage, Viscosity reduction, effect of reducing addition point
Pending Publication Date: 2022-08-02
WENGFU (GRP) CO LTD
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Problems solved by technology
Because this process involves the addition of sodium sulfide in the two stages of the pretreatment process and the extraction and purification process, the risk of hydrogen sulfide leakage increases and the difficulty of safety control increases. The food acid and arsenic index of the section does not meet the food-grade phosphoric acid standard and can only be downgraded for use
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[0023] A phosphoric acid purification and dearsenic device, comprising a dearsenic reaction tank 1, a tail gas scrubbing system 7, a tail gas chimney 12, a pretreatment filter system 14, an extraction system 18, and a precision filter system 23,
[0024] Wherein, the dearsenic reaction tank 1 includes a phosphoric acid inlet 2, a sodium sulfide inlet 3, a tail gas outlet 4, a tail washing liquid inlet 5, and a phosphoric acid outlet 6 of the dearsenic reaction tank,
[0025] The tail gas washing system 7 includes a washing tail gas inlet 8, a tail washing liquid outlet 9, a washing tail gas outlet 10, and a sodium hydroxide solution inlet 11,
[0026] The exhaust chimney 12 is provided with a chimney exhaust inlet 13,
[0027] The pretreatment filter system 14 includes a pretreatment filter mixed acid inlet 15, a pretreatment filter residue outlet 16, and a pretreatment filter acid outlet 17.
[0028] The extraction system 18 includes an extraction phosphoric acid inlet 19, a...
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The invention discloses a phosphoric acid purification and arsenic removal device which comprises an arsenic removal reaction tank, a tail gas washing system, a tail gas chimney, a pretreatment filtering system, an extraction system and a precision filtering system. Wherein the arsenic removal reaction tank comprises a phosphoric acid inlet, a sodium sulfide inlet, a tail gas outlet, a tail washing liquid inlet and a phosphoric acid outlet of the arsenic removal reaction tank, the tail gas washing system comprises a washing tail gas inlet, a tail washing liquid outlet, a washing tail gas outlet and a sodium hydroxide solution inlet, and the tail gas chimney is provided with a chimney tail gas inlet. The pretreatment filtration system comprises a pretreatment filtration mixed acid inlet, a pretreatment filtration residue discharge port and a pretreatment filtration clear acid outlet, the extraction system comprises an extraction phosphoric acid inlet, an extraction agent inlet, a load solvent outlet and a raffinate acid outlet, and the precision filtration system comprises a shell, a filter element and a filter element partition plate. The shell is divided into a primary liquid filtering chamber and a clear liquid filtering chamber by the filtering partition plate; and the filter element is mounted on the partition plate. The hydrogen sulfide leakage risk can be effectively reduced.
Description
technical field [0001] The invention relates to phosphoric acid purification, in particular to a phosphoric acid purification and dearsenic device. Background technique [0002] Solvent extraction is the mainstream process for wet phosphoric acid purification. Fertilizer-grade phosphoric acid can be extracted and purified to produce food-grade phosphoric acid. Food-grade phosphoric acid has extremely strict requirements on the content of arsenic. The current national standard (GB1886.304-2020) requires that the content of arsenic in food-grade phosphoric acid be less than 0.5ppm. [0003] The current dearsenic technology is to add excess sodium sulfide to phosphoric acid in the pretreatment process of wet phosphoric acid purification. The sodium sulfide reacts with phosphoric acid to generate hydrogen sulfide and reacts with arsenic in phosphoric acid. After separation by filtration, the clear acid enters the extraction and purification process, and the loaded solvent after...
Claims
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IPC IPC(8): B01J19/00C01B25/238C01B25/46
CPCB01J19/0006C01B25/238C01B25/46B01J2219/00006
Inventor 吴邦文田仁道杨刚
Owner WENGFU (GRP) CO LTD