A method for preparing battery-grade iron phosphate from industrial iron-containing waste
An iron phosphate, battery-level technology, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problems of inconvenient residual carbon content and high cost of ferrous oxalate, achieve excellent electrochemical performance, improve commercial value, and maintain consistency sexual effect
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Embodiment 1
[0032] Take 500mL of iron-containing waste acid, filter it, add 20g of waste iron slag to the obtained solution, and react at 30°C for 48h until the solution pH=5. Subsequently, the above solution was filtered twice to obtain a green clear solution; under stirring conditions, 80 mL of hydrogen peroxide and 100 mL of phosphoric acid were added to the above clear solution for 18 hours of reaction. Finally, when the water bath is heated to 92°C, add 110mL of phosphoric acid and 250mL of sodium hydroxide solution, and react for 5 hours to form a yellow suspension; filter and wash to pH = 6 and dry at 100°C for 10 hours to obtain ferric phosphate dihydrate (FePO 4 2H 2 O) Samples.
[0033] Accurately weigh Li 2 CO 3 、FePO 4 2H 2 O (Example 1) and glucose were ball milled in absolute ethanol medium for 12 hours, mixed evenly, transferred to an oven at 50°C for about 12 hours, and after drying, they were sintered in a tube furnace under a nitrogen atmosphere and sieved to obtain...
Embodiment 2
[0035]Take 500mL of iron-containing waste acid, filter it, add 20g of waste iron slag to the obtained solution, and react at 30°C for 48h until the solution pH=5. Subsequently, the above solution was filtered twice to obtain a green clear solution; under stirring conditions, 80 mL of hydrogen peroxide and 100 mL of phosphoric acid were added to the above clear solution for 18 hours of reaction. Finally, when the water bath is heated to 87°C, add 110mL of phosphoric acid and 250mL of sodium hydroxide solution, and react for 5 hours to form a yellow suspension; filter and wash to pH=6 and dry at 100°C for 10 hours to obtain ferric phosphate dihydrate (FePO 4 2H 2 O) Samples.
Embodiment 3
[0037] Take 500mL of iron-containing waste acid, filter it, add 20g of waste iron slag to the obtained solution, and react at 30°C for 48h until the solution pH=5. Subsequently, the above solution was filtered twice to obtain a green clear solution; under stirring conditions, 80 mL of hydrogen peroxide and 100 mL of phosphoric acid were added to the above clear solution for 18 hours of reaction. Finally, when the water bath is heated to 92°C, add 80g of ammonium dihydrogen phosphate and 250mL of sodium hydroxide solution, and react for 5 hours to form a yellow suspension; filter and wash to pH = 6 and dry at 100°C for 10 hours to obtain phosphoric acid dihydrate Iron (FePO 4 2H 2 O) Samples.
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