PROCEDIMIENTO PARA LA PREPARACION DE PIGMENTOS A BASE DE CROMATOS DE PLOMO

摘要

A process for the preparation of lead chromate based pigments comprising the steps of nucleation and growth and wherein: (a) the lead ion is released by means of time and/or temperature conditions allowing the later precipitation of the lead ion absorbed or occluded in the crystal and the rearrangement of said crystal; (b) the lead ion is precipitated by the addition of sodium or potassium salts; (c) the crystal structure is prestabilized by reaction "in situ" of sodium silicate and an ammonium salt; (d) the crystal is hot stabilized by the addition of hydrated oxides of a metal at two valency levels thereof; (e) the crystal stabilization is consolidated by phosphorous salts.