Sol-gel And Step By Step Parcel Method For The Preparation Of Zirconium-silicate-based Cerium Sulfide Inclusion Pigment

The technology of high temperature of zirconium silicate（ZrSiO₄）wrapped sulfur selenide cadmium(CdS_x Se_1-x)pigment is mature,but it contains elements of harmful heavy metal cadmium（Cd）,should not be universal access.The red cerium sulphide（Ce₂S₃）pigment have rich colors and strong coloring and non-toxic fine features,is considered to be able to replace the traditional substitutes containing cadmium,chromium and other heavy toxic red pigments.But Ce₂S₃ is not suited to high temperature,the maximum temperature in an oxidizing atmosphere can be stable for350℃,Ce₂S₃ will be oxidized and decomposed into CeO₂ above this temperature,how to get high-temperature red material ceramic industry has been the focus of attention.This article take sol-gel and step by step parcel method to coat Ce₂S₃ and successfully develop a high temperature,chemically stable ZrSiO₄ package Ce₂S₃pigment.Firstly prepared alkaline silica sol,the silica sol from the laboratory with a uniform and dispersed Ce₂S₃ were well mixed and then heated while stirring,until the formation of a gel A;The obtained gel A will be ground after be dried and well mixed with（NH₄）₂ZrO（CO₃）₂,also heated while stirring,until the formation of a gel B;the gel B will be dried and ground,mixing with a certain amount of mineralizers（LiF）,Eventually placed in 750℃（homemade weakly reducing atmosphere）high-temperature furnace fired 30min,ZrSiO₄ package Ce₂S₃ pigment can be prepared by high-temperature.The advantage of this method is that zirconia and silica are primary and nanoscale particles during the process of each solution into the sol,and then in conjunction with mineralization of the mineralizers,so that the temperature of the synthesis ZrSiO₄ can be further reduced,and step by step parcel method of Ce₂S₃ tightly wrapped by the zirconia and silica particles,so ZrSiO₄ start to compound and Ce₂S₃ are wrapped by ZrSiO₄during subsequently calcined in high temperature.The combination of sol-gel and step by step parcel method,can synthesis the pigment of Ce₂S₃ is wrapped by ZrSiO₄ at a relatively low temperature（750℃）,XRD,SEM,TEM,DTA-TG were characterized for experiments.The results show that this method synthesis red pigments have features include subjecting to high temperature,coloration and relatively non-toxic.To a certain extent,the pigment of Ce₂S₃ wrapped by ZrSiO₄ can alternative Cd（SxSe1-x）containing heavy metals.