BAYERITE

BAYERITE Chemische Eigenschaften,Einsatz,Produktion Methoden

• Chemische Eigenschaften

  monoclinic, a=0.506 nm, b=0.867 nm, c=0.471 nm; used to make η-alumina catalyst [KIR78]

• Physikalische Eigenschaften

  Habit: fine fibers.
  Color: colorless.
  Luster: silky.
  Diaphaneity: translucent to transparent.
  Streak: white.
  Occurrence: precipitates of aluminum hydroxide gels onto carbonates at pH > 5.8.

• synthetische

  Aluminum hydroxide (C.P. or better) is dissolved with moderate heating in sodium hydroxide solution (saturated in the cold) until saturation is attained. The solution is diluted with water to a density of 1.15 and suction-filtered through hard filter paper. Carbon dioxide is then bubbled through the filtrate for three days. The mother liquor is decanted from the resulting precipitate; the subsequent treatment is identical to that described for hydrargillite (I). The thoroughly washed and dried residue is pure bayerite.