The invention provides an
ammonium dichromate and
sodium sulfate mixed crystal as well as a preparation method and application thereof. The preparation method comprises the following steps: heating amixed solution of
sodium dichromate,
ammonium sulfate and
sodium sulfate, and conducting cooling and crystallizing to obtain a saturated
salt solution; and heating the obtained saturated
salt solution, then adding
ammonium sulfate, then adding
sodium dichromate, conducting stirring for reaction, and then conducting cooling for
crystallization to obtain mixed crystals and
crystallization mother liquor. According to the invention, the saturated
salt solution is used as a reaction base solution, and then the
mixed crystal with uniform, dispersed and non-sticky particle size is prepared by controlling the reactant adding mode and proportion, reaction and post-treatment process, so that the generation of
double salt is avoided, and the composition of the
mixed crystal is ensured to meet the requirements; meanwhile, due to the use of the reaction base solution,
evaporation and concentration steps can be omitted, and the
crystallization yield is increased; and a
chromium oxide green
pigment is prepared from the obtained mixed
crystal, so that the problem of difficult feeding in industrial production can be effectively solved, and the obtained product has better
chromaticity parameters andexcellent performance.