Production method for purifying low-concentration wet-process phosphoric acid, and purification apparatus thereof
A wet-process phosphoric acid, production method technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry and other directions, can solve the problems of high phosphoric acid concentration requirements, low impurity removal rate, long process flow, etc., to improve the mixing effect, The effect of high extraction rate and shortened process flow
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Embodiment 1
[0029] Embodiment 1: The technological process of 6000 tons / year purification wet-process phosphoric acid is as follows:
[0030] Concentration is 34wt%P 2 o 5 The raw material of wet-process phosphoric acid is settled and filtered, and Na is added to it 2 CO 3 , at 60-80°C, the reaction generates Na 2 SiF 6 Precipitate and filter to obtain pretreated defluorinated raw phosphoric acid, which enters the raw acid tank of the purification section.
[0031] The pretreated raw material wet-process phosphoric acid and organic solvent (a mixed solution of butyl phosphonate and dimethylheptyl phosphate, volume ratio 1:2, specific gravity 0.946) are metered by the pump to control the two-phase phase Ratio, and sent to the mixing chamber. At room temperature, the raw phosphoric acid and organic solvent are fully mixed, and the phosphoric acid enters the organic phase to obtain an extracted organic phase with a specific gravity of 1.206, and most impurities enter the raffinate. In...
Embodiment 2
[0034] Embodiment 2: Embodiment 1: the technological process of 15000 tons / year purification wet-process phosphoric acid is as follows:
[0035] Concentration of 42wt% P 2 o 5 The raw material of wet-process phosphoric acid is settled and filtered, and Na is added to it 2 CO 3 , at 68~88℃, the reaction generates Na 2 SiF 6 Precipitate and filter to obtain pretreated defluorinated raw phosphoric acid, which enters the raw acid tank of the purification section.
[0036] Pretreated raw material wet-process phosphoric acid and organic solvent (mixed solution of dibutyl butyl phosphonate, diisooctyl isopropyl phosphonate and butyl dibutyl phosphonate, the volume ratio is 3:4:3, Specific gravity 0.939) is measured by the pump to control the two-phase phase ratio, and transported to the mixing chamber. At room temperature, the raw phosphoric acid and the organic solvent are fully mixed, and the phosphoric acid enters the organic phase to obtain an extracted organic phase with a...
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