水ガラスを原料とするケイ酸ニッケルの合成

概要

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A precursor of nickel sillicate was synthesized by the reaction of nickel nitrate with sodium metasilicate in an aqueous solution. The reaction was carried out by adding a sodium metasilicate solution of 0.75 mol/l to a refluxed nickel nitrate solution of 1.5 mol/l in a drop-wise way and reacted for 1h. The precursor was then sintered at 1200℃ for 2h. The reaction can be assumed to proceed by the following process. Na_2SiO_3+2Ni(NO_3)_2+3.5H_2O→Ni_2SiO_4・2.5H_2O+2HNO_3+2NaNO_3 The precursor and sintered samples were analyzed by XRD, atomic absorption spectrometry and TG/DTA. The sintered sample was confirmed to be nickel silicate, Ni_2SiO_4. Nickel hydroxide remaining unreacted in the sintered sample was removed by treating the nickel silicate precursor with an anmmonia solution, and cristobalite was also removed from the sintered product by dissolving it in a hydrofluoric acid. The resulting sample was shown to be pure nickel silicate, Ni_2SiO_4, by XRD.
社団法人日本セラミックス協会の論文
1995-03-01