Interaction of nickel hydroxocarbonate, ammonium paramolybdate, and ammonium metatungstate under mechanical activation

摘要

The interaction of nickel hydroxocarbonate, ammonium paramolybdate, and ammonium metatungstate (Ni: Mo: W = 3: 1: 1) is reported. Under mechanical activation conditions, nickel hydroxocarbonate particles undergo comminution and ammonium paramolybdate and ammonium metatungstate particles soften and aggregate. It is demonstrated by DTA, X-ray diffraction, and IR spectroscopy that heat treatment of the mechanically activated mixture at 400-450A degrees C yields the salts NiMoO4 and NiWO4.