A kind of diatomite-based/nickel-zinc ferrite wave absorbing agent and preparation method thereof
A technology of nickel-zinc ferrite and diatomite, applied in chemical instruments and methods, iron compounds, inorganic chemistry, etc., can solve the problems of high cost, complicated process, high calcination temperature, etc., and achieve the effect of low price and wide range of raw materials
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Embodiment 1
[0024] (1) Pretreatment of diatomite: wash the diatomite with 0.1mol / L hydrochloric acid for 2 hours, and then wash it with deionized water to neutrality after filtration. After filtration, dry it at 60°C to absolute dryness, then Calcined at 400°C for 4h.
[0025] (2) Preparation of precursor solution: at room temperature, 2.1384gNiCl 2 ·6H 2 O, 2.8623gZnCl 2 and 16.2gFeCl 3 ·6H 2 O was dissolved in 100mL water to obtain a mixed metal salt solution; 18.9126g of citric acid was added to the mixed solution, stirred evenly, ammonia was added dropwise to the mixed solution, and the pH of the solution was adjusted to 5;
[0026] (3) Preparation of diatomite-based nickel zinc ferrite xerogel: Add 7.14 g of diatomite to the solution obtained in step (2), and stir the mixed solution at 60° C. for 6 hours at a stirring speed of 400 r / min to obtain a viscous sol, transfer the sol to a crucible, and dry at 100°C for 20 hours to obtain a diatomite-based nickel-zinc-ferrite precurso...
Embodiment 2
[0032] (1) Pretreatment of diatomite: wash the diatomite with 0.3mol / L hydrochloric acid for 3h, filter and wash with deionized water to neutrality, dry it at 80°C to absolute dryness after filtration, and then Calcined at 420°C for 3h.
[0033] (2) Preparation of precursor solution: at room temperature, 4.3622gNi(NO 3 ) 2 ·6H 2 O, 4.4624gZn (NO 3 ) 2 ·6H 2 O and 24.24g Fe(NO 3 ) 3 9H 2O was dissolved in 100mL of deionized water to obtain a mixed metal salt solution; 18.9126g of citric acid was added to the mixed solution, stirred evenly, ammonia was added dropwise to the mixed solution, and the pH of the solution was adjusted to 5;
[0034] (3) Preparation of diatomite-based nickel-zinc ferrite xerogel: add 6 g of diatomite to the solution obtained in step (2), stir the mixed solution at 70° C. for 4 h, and the stirring speed is 300 r / h min, to obtain a viscous sol, transfer the sol to a crucible, and dry at 110°C for 26 hours to obtain a diatomite-based nickel-zinc-...
Embodiment 3
[0040] (1) Pretreatment of diatomite: wash the diatomite with 0.5mol / L hydrochloric acid for 4 hours, filter and wash it with deionized water until neutral, dry it at 90°C to absolute dryness after filtration, and then Calcined at 430°C for 2h.
[0041] (2) Preparation of precursor solution: at room temperature, 1.9714gNiSO 4 ·6H 2 O, 2.1525gZnSO 4 ·7H 2 O and 8.4276g Fe 2 (SO 4 ) 3 9H 2 O was dissolved in 100mL deionized water to obtain a mixed metal salt solution; 18g of citric acid was added to the mixed solution, stirred evenly, ammonia was added dropwise to the mixed solution, and the pH of the solution was adjusted to 6;
[0042] (3) Preparation of diatomite-based nickel-zinc ferrite xerogel: add 7.14 g of diatomite to the solution obtained in step (2), stir the mixed solution at 70° C. for 5 h, and the stirring speed is 400 r / min to obtain a viscous sol, transfer the sol to a crucible, and dry it at 120°C for 30 hours to obtain a diatomite-based nickel-zinc-fer...
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