Preparation method of coated type composite iron phosphide
An iron phosphide and coated technology, which is applied in the direction of chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve the problems of complex and cumbersome steps, strict equipment, high cost, etc., and achieve uniform particle size distribution, The effect of simple process and low cost
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Embodiment 1
[0037] A preparation method of coated composite ferric phosphide, characterized in that it comprises the following steps:
[0038] (1) Add iron oxide red to citric acid and polyethylene glycol. After mixing, add pure water and add water to stir for slurry, then add phosphoric acid and cobalt acetate, stir to dissolve, and then use a jar mill to grind to a particle size of 0.7 μm ;
[0039] (2) Spray-dry the finely ground slurry in a spray dryer until the moisture content of the dried material is lower than 1%;
[0040] (3) Put the dry material into the rotary furnace, feed nitrogen gas at the same time, react at a temperature of 880°C for 4.2 hours, then cool to a temperature lower than 120°C, and then undergo airflow crushing, then classify in the classification chamber, after classification The material is screened to obtain coated composite iron phosphide.
[0041] In the step (1), the grinding balls in the pot mill are zirconia, alumina or stainless steel balls with a di...
Embodiment 2
[0053] A preparation method of coated composite ferric phosphide, characterized in that it comprises the following steps:
[0054] (1) Add iron oxide red to citric acid and polyethylene glycol. After mixing, add pure water and add water to stir for slurry, then add phosphoric acid and cobalt acetate, stir to dissolve, and then use a jar mill to grind to a particle size of 0.65 μm ;
[0055] (2) Spray-dry the finely ground slurry in a spray dryer until the moisture content of the dried material is lower than 1%;
[0056] (3) Put the dry material into the rotary furnace, feed nitrogen gas at the same time, react at a temperature of 865°C for 4.5 hours, then cool to a temperature lower than 120°C, and then undergo airflow crushing, then classify in the classification chamber, after classification The material is screened to obtain coated composite iron phosphide.
[0057] In the step (1), the grinding balls in the pot mill are zirconia, alumina or stainless steel balls with a d...
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