Preparation method of rare earth sulfide pigment

Abstract

The invention discloses a preparation method of a rare earth sulfide pigment, which comprises the following steps: carrying out high-temperature solid-phase reaction on zinc sulfide as a sulfur source and rare earth oxide in a reducing atmosphere to obtain rare earth sulfide powder. The preparation steps are simple, toxic, flammable and explosive vulcanizing agents such as H2S, CS2 or elemental sulfur powder are not used, and the preparation method is a green preparation method suitable for the rare earth sulfide pigment.

Description

technical field [0001] The invention belongs to the field of chemical pigment preparation, in particular to a preparation method of rare earth sulfide pigment. Background technique [0002] A colorful world requires pigments of different shades. Compared with toxic pigments containing cadmium, mercury, lead and other elements, non-toxic light rare earth sulfides represented by cerium sulfide and lanthanum sulfide have the advantages of bright color, non-toxicity, strong hiding power, etc., and can replace the currently widely used organic pigments. Pigments and inorganic pigments containing toxic heavy metals have a wide range of application markets in plastics, paints, coatings, ceramics and other fields. [0003] Light rare earth sulfide Ln 2 S 3 (Ln=La, Ce, Pr, Nd, Sm) is referred to as rare earth sulfide, also called sesquisulfide, and there are three crystal forms of α, β, and γ. The α phase is a low-temperature phase, stable below 900°C, and has Gd 2 S 3 type cry...

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Problems solved by technology

This type of method does not use toxic vulcanizing agents such as hydrogen sulfide, carbon disulfide or sulfur vapor, but requires supporting wastewater treatment equipment, which is not conducive to expanding production

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