METHOD FOR PRODUCING BROWNMILLERITE OXIDES

• Main Authors: SUMI IKUHIRO, MURAI RYOTA, TSUTSUMI KOICHI, OGAWA NAOTAKA
• Format: Patent
• Language: English; Japanese
• Published: 10.05.2018
• Subjects: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; INORGANIC CHEMISTRY; METALLURGY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; THEIR RELEVANT APPARATUS; TRANSPORTING

PROBLEM TO BE SOLVED: To provide a method capable of producing brownmillerite oxides with quality uniformity and efficiency.SOLUTION: There is provided a method for producing brownmillerite oxides that employs, as raw materials, two or more kinds of solid compounds containing components that are of the composition of the target brownmillerite oxide. The method comprises a step A of mixing together two or more kinds of solid compounds serving as raw materials; a step B of griding the mixed raw material undergoing the step A to ensure that the mixed raw material is finely ground, preferably having a median particle size of 0.8 μm or less; and a step C of calcining the finely-ground mixed raw material obtained in the step B at a solid phase state. The calcining of the finely-ground mixed raw material at a solid phase state enables a molecular level contact to be sufficient for reaction. This allows an entirety of the mixed raw material to undergo a proper synthesis reaction. As a result, brownmillerite oxides with uniform quality are obtained.SELECTED DRAWING: Figure 1 【課題】ブラウンミラーライト型酸化物を品質にバラツキを生じることなく効率的に製造することができる製造方法を提供する。【解決手段】製造しようとするブラウンミラーライト型酸化物の組成の各成分をそれぞれ含む２種以上の固体化合物を原料としてブラウンミラーライト型酸化物を製造する方法であり、原料である２種以上の固体化合物を混合する工程Ａと、この工程Ａを経た混合原料を微粉状に粉砕、好ましくはメジアン粒径０．８μｍ以下に粉砕する工程Ｂと、この工程Ｂで得られた微粉状の混合原料を固相状態で焼成する工程Ｃを有する。微粉状の混合原料を固相状態で焼成することにより、分子レベルの接触が反応に十分な状態となるため、混合原料全体で合成反応が適切に生じ、均一な品質のブラウンミラーライト型酸化物が得られる。【選択図】図１