A kind of desalination method containing high-concentration sodium nitrate and/or potassium nitrate aqueous solution
A technology of sodium nitrate and potassium nitrate, applied in chemical instruments and methods, neutralization water/sewage treatment, water/sewage treatment and other directions, can solve problems such as large energy consumption, achieve economical conservation, environmental protection, easy operation and simple equipment Effect
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Embodiment 1
[0018] At 25–30°C, 16.7g NaNO 3 Dissolve in 100mL water (NaNO at 25°C 3 The saturation solubility is about 91gNaNO 3 / 100g water), under vigorous stirring, dropwise add 2.521g 85% H 3 PO 4 , while adding 3.679g CaO to control the pH of the solution to 7–7.5. After the addition is complete, let stand, settle and filter to remove the precipitate containing sodium nitrate. In the XRD pattern of this precipitate (see attached figure 1 ), at 2θ=29.42°, 31.84°, 35.40°, 38.98°, etc., there are obvious characteristic diffraction peaks of sodium nitrate (refer to PDF#36-1474).
[0019] The weight of the precipitate is about 12.8g. According to nitrogen element analysis and inductively coupled plasma emission spectrometry (ICP), the N content of the precipitate is 8.28wt%, the Na content is 13.5%, and the removal rate is estimated to be about 38%.
Embodiment 2
[0021] At 10–15°C, 19.0 g KNO 3 Dissolve in 100mL water (KNO at 10°C 3 The saturated solubility is about 21gKNO 3 / 100g water), under strong stirring, add 6.8g Ca(H 2 PO 4 ) 2 ·H 2 O and 4.4g Ca(OH) 2 , to control the pH of the solution to 7.5–8.0. After the dropwise addition was complete, stirring was continued for 1 hour. After that, it was allowed to stand, settle and filter to remove the precipitate containing potassium nitrate. In the XRD pattern of this precipitate (see attached figure 2 ), at 2θ=23.42°, 29.24°, 32.22°, 33.70°, 41.02°, etc., there are obvious characteristic diffraction peaks of potassium nitrate (refer to PDF#05-0377).
[0022] The weight of the precipitate is about 18.1g. According to elemental analysis, the N content is 7.38wt%, and the K content is about 20.5wt%. It is estimated that KNO 3 The removal rate is about 50.5%.
Embodiment 3
[0024] At room temperature, 10g KNO 3 Dissolve in 100mL water, add 30g 85% H 3 PO 4 , while adding 12.0 g of CaO, stirring vigorously and controlling the pH of the solution to 8–8.5. After the addition was complete, stirring was continued for 0.5 hours. After that, it was allowed to stand, settle and filter to remove the precipitate containing potassium nitrate. The XRD patterns and attached figure 2 resemblance.
[0025] The weight of the precipitate is about 35.6g. According to the elemental analysis, the N content is 1.1wt%, and the K content is 2.8wt%. It is estimated that KNO 3 The removal rate is about 28.3%
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