Preparation of high pure ferric phosphate
A technology of ferric orthophosphate and ferric phosphate, applied in the direction of phosphate, phosphorus oxyacid, etc., can solve the problems of low product purity, yellowish color of ferric phosphate, high production cost, and achieve simple process operation, white product color, The effect of low production cost
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Embodiment 1
[0007] Dissolve 142.5g of ferrous sulfate heptahydrate in water to prepare a solution of about 400ml, add 27g of concentrated sulfuric acid, add 40g of hydrogen peroxide at 25°C, and oxidize for 30 minutes to obtain a ferric sulfate solution for use.
[0008] Dissolve 190 g of trisodium phosphate dodecahydrate in water to prepare a solution of about 800 ml. The above-mentioned ferric sulfate solution was stirred and heated to 75° C., and then the sodium phosphate solution was added dropwise to the ferric sulfate solution, and the reaction was incubated for 30 minutes after the addition. Filter and wash to pH 4-5.
[0009] Weigh 60 g of phosphoric acid with water to make about 800 ml of phosphoric acid solution, beat and stir the above-mentioned filtered and washed material evenly, and react at 90° C. for 0.5 hour. Filter and wash to about pH 5, and dry to obtain a white powder product with a Fe content of 28.91% and a purity of 99.62% (dry basis).
Embodiment 2
[0011] Dissolve 100 g of ferrous chloride tetrahydrate in water to prepare a solution of about 400 ml, add 60 g of concentrated hydrochloric acid, add 40 g of hydrogen peroxide at 10° C., and conduct oxidation reaction for 120 minutes to obtain a ferric chloride solution for use.
[0012] Dissolve 180 g of disodium hydrogen phosphate dodecahydrate in water to prepare a solution of about 800 ml. The above-mentioned ferric chloride solution was stirred and heated to 30° C., and then the disodium hydrogen phosphate solution was added dropwise to the ferric chloride solution, and the reaction was incubated for 120 minutes after the addition. Filter and wash to pH 4-5.
[0013] Weigh 60 g of phosphoric acid with water to make about 800 ml of phosphoric acid solution, beat and stir the above-mentioned filtered and washed material evenly, and react at 60° C. for 8 hours. Filter and wash to about pH 5, and dry to obtain a white powder product with a Fe content of 28.73% and a purity ...
Embodiment 3
[0015] 142.5g of ferrous sulfate heptahydrate was dissolved in water to prepare a solution of about 400ml, 27g of concentrated sulfuric acid was added, 12g of sodium chlorate was added at 90°C, and the oxidation reaction was carried out for 10 minutes to obtain a ferric sulfate solution, which was used for later use.
[0016] Dissolve 135 g of potassium phosphate trihydrate in water to prepare a solution of about 800 ml. The above ferric sulfate solution was stirred and maintained at a temperature of about 10° C., then the potassium phosphate solution was added dropwise to the ferric sulfate solution, and the reaction was incubated for 60 minutes after the addition. Filter and wash to pH 4-5.
[0017] Weigh 60 g of phosphoric acid with water to make about 800 ml of phosphoric acid solution, beat and stir the above-mentioned filtered and washed material evenly, and react at 40° C. for 10 hours. Filter and wash to about pH 5, and dry to obtain a white powder product with a Fe c...
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