Method and device for preparing composite phosphate fertilizer from wastewater
A phosphate fertilizer and wastewater technology, applied in fertilization equipment, sewage/sludge fertilizer, chemical instruments and methods, etc., can solve the problems of less adsorption, low purity of phosphate fertilizer, harsh conditions, etc., and achieve saving of operating costs and high selective adsorption , good separation effect
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Embodiment 1
[0037] Example 1 Preparation of lanthanum-loaded adsorbent
[0038] (1) N 2 Under protection, 0.42mol / L FeCl 3 solution with 0.21mol / L FeCl 2 Solution and 25wt% ammonia monohydrate solution were mixed and stirred according to the volume ratio of 1:1:2, and 0.50mol / L nitric acid was added to adjust the pH to 3 to obtain Fe 3 o 4 Nano magnetic nucleus precursor suspension 66 mL;
[0039] (2) Under the condition of heating in a water bath at 70°C, slowly inject 5mL of an ethanol solution of 10wt% trimethylsiloxysilicate into the suspension prepared in step (1) until the concentration of sodium silicate is 2.5wt%, The precipitate was magnetically separated, washed and dried to obtain SiO 2 wrapped Fe 3 o 4 Granules 5.2g;
[0040] (3) Add 3.65g of magnesium chloride hexahydrate (18 mmol), 0.3176g of aluminum trichloride hexahydrate (3mmol), and 1.11g of lanthanum chloride heptahydrate (3mmol) into 400mL of NaOH solution with a concentration of 1.5mol / L, A magnesium aluminu...
Embodiment 2
[0043] Example 2 Preparation of adsorbent for loading hafnium
[0044] (1) N 2 Under protection, 0.42mol / L FeCl 3 solution with 0.21mol / L FeCl 2 Solution and 25wt% ammonia monohydrate solution were mixed and stirred according to the volume ratio of 1:1:2, and 0.50mol / L nitric acid was added to adjust the pH to 3 to obtain Fe 3 o 4 Nano magnetic nucleus precursor suspension 66 mL;
[0045] (2) Under the condition of heating in a water bath at 70°C, slowly inject 5mL of an ethanol solution of 10wt% trimethylsiloxysilicate into the suspension prepared in step (1) until the concentration of sodium silicate is 2.5wt%, The precipitate was magnetically separated, washed and dried to obtain SiO 2 wrapped Fe 3 o 4 Granules 5.2g;
[0046] (3) Add 3.65g of magnesium chloride hexahydrate (18 mmol), 0.3176g of aluminum trichloride hexahydrate (3mmol), and 1.7g of hafnium oxychloride octahydrate (3mmol) into 400mL of NaOH solution with a concentration of 1.5mol / L , to obtain a magn...
Embodiment 3
[0049] Example 3 Preparation of adsorbent for loading cerium
[0050] (1) N 2 Under protection, 0.42mol / L FeCl 3 solution with 0.21mol / L FeCl 2 Solution and 25wt% ammonia monohydrate solution were mixed and stirred according to the volume ratio of 1:1:2, and 0.50mol / L nitric acid was added to adjust the pH to 3 to obtain Fe 3 o 4 Nano magnetic nucleus precursor suspension 66 mL;
[0051] (2) Under the condition of heating in a water bath at 70°C, slowly inject 5mL of an ethanol solution of 10wt% trimethylsiloxysilicate into the suspension prepared in step (1) until the concentration of sodium silicate is 2.5wt%, The precipitate was magnetically separated, washed and dried to obtain SiO 2 wrapped Fe 3 o 4 Granules 5.2g;
[0052] (3) Add 3.65g of magnesium chloride hexahydrate (18 mmol), 0.3176g of aluminum trichloride hexahydrate (3mmol), and 1.8g of cerium chloride hydrate (3mmol) into 400mL of NaOH solution with a concentration of 1.5mol / L to obtain Magnesium aluminu...
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