Method for coating carbonyl iron powder with silicon dioxide under ethanol-free system
A carbonyl iron powder and silicon dioxide technology is applied in the field of silicon dioxide coating carbonyl iron powder in an ethanol-free system, which can solve the problems of complicated steps and high cost, improve corrosion resistance and dispersibility, simplify the production process, The effect of reducing production costs
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Embodiment 1
[0015] Embodiment 1: a kind of method that silica coats carbonyl iron powder under the ethanol-free system, it comprises the following steps:
[0016] S1. Add carbonyl iron powder to tetraethyl orthosilicate, the weight ratio of carbonyl iron powder and tetraethyl orthosilicate is 1:1, stir for 40 minutes, and mix the two evenly to obtain a mixture;
[0017] S2. Add 0.1 parts by weight of ammonia water to 4 parts by weight of distilled water and mix evenly to obtain an ammonia solution, and add the ammonia solution dropwise to the mixture in step S1, stir and hydrolyze for 3 hours at room temperature, vacuum filter, and the resulting precipitate Wash with absolute ethanol for 3 times, and dry at 60°C for 10 hours to obtain carbonyl iron powder coated with silica;
[0018] Wherein, the weight portion of the carbonyl iron powder and the ammonia solution is 1:1.
Embodiment 2
[0019] Embodiment 2: a kind of method that silicon dioxide coats carbonyl iron powder under ethanol-free system, it comprises the following steps:
[0020] S1. Add carbonyl iron powder to tetraethyl orthosilicate, the weight ratio of carbonyl iron powder and tetraethyl orthosilicate is 1:5, stir for 60 minutes, and mix the two evenly to obtain a mixture;
[0021] S2. Add 0.4 parts by weight of ammonia water to 5 parts by weight of distilled water and mix evenly to obtain an ammonia solution, and add the ammonia solution dropwise to the mixture in step S1, stir and hydrolyze for 4 hours at room temperature, vacuum filter, and the resulting precipitate Wash with absolute ethanol for 3 times, and dry at 90°C for 12 hours to obtain carbonyl iron powder coated with silica;
[0022] Wherein, the weight portion of the carbonyl iron powder and the ammonia solution is 1:5.
Embodiment 3
[0023] Embodiment 3: a kind of method that silicon dioxide coats carbonyl iron powder under the ethanol-free system, it comprises the following steps:
[0024] S1. Add carbonyl iron powder to tetraethyl orthosilicate, the weight ratio of carbonyl iron powder and tetraethyl orthosilicate is 1:2, stir for 50min, and mix the two evenly to obtain a mixture;
[0025] S2. Add 0.38 parts by weight of ammonia water to 4.5 parts by weight of distilled water and mix uniformly to obtain an aqueous ammonia solution, and add the aqueous ammonia solution dropwise to the mixture in step S1, stir and hydrolyze for 3.5 hours at room temperature, and vacuum filter to obtain The precipitate was washed 3 times with absolute ethanol, and dried at 75°C for 11 hours to obtain carbonyl iron powder coated with silica;
[0026] Wherein, the weight portion of carbonyl iron powder and ammonia solution is 1:2.5.
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