A method of soaking cadmium-containing waste acid solution in acid to prepare wrapped pure yellow pigment

Abstract

A method of soaking cadmium-containing waste acid solution in acid to prepare coated yellow pigments. The cadmium-containing wastewater treated by acid soaking is directly used to produce zirconium silicate microcrystals to wrap cadmium sulfide pigments, and zinc ions are introduced into doped zinc ions through zinc sulfate to form cadmium sulfide. , Zinc sulfide solid solution chromogenic agent, producing pure yellow pigment coated with cadmium zinc sulfide crystallite zirconium silicate. The present invention utilizes zirconium oxychloride, zinc sulfate and acid to soak waste acid solution containing cadmium and selenium to carry out chemical co-precipitation reaction in the reactor with sodium hydroxide and sodium sulfide. After the reaction is completed, carry out pressure filtration washing and drying; The ratio is mixed with mineralizer and white carbon black evenly, after high-temperature calcination, the calcined product is subjected to acidification, ball milling, pressure filtration, water washing processes, and dried to obtain zirconium silicate-wrapped cadmium sulfide yellow pigment or wrapped zinc cadmium sulfide-wrapped pure yellow Pigment products. Encapsulated pure yellow pigment can be used instead of praseodymium yellow pigment.

Description

technical field [0001] The invention relates to a coloring and pigment production process for ceramic decorative materials, in particular to a method for directly recycling cadmium-containing waste acid liquid from the acid soaking process in the production of cadmium sulfide colorants by using zirconium silicate to regenerate silicic acid. Zirconium wraps yellow pigments, and introduces doped zinc ions through zinc sulfate to produce wrapped pure yellow pigments with zirconium silicate microcrystals wrapped with cadmium zinc sulfide to replace praseodymium yellow, which achieves better hue and color development than traditional praseodymium yellow pigments process method. It belongs to the technical field of ceramic pigment (pigment) production. Background technique: [0002] In the production of zirconium silicate-wrapped cadmium sulfide pigment (i.e. wrapped yellow), since the color-forming agent cadmium sulfide is not completely wrapped by zirconium silicate crystals, t...

AI Technical Summary

Problems solved by technology

[0014] The object of the present invention is exactly to provide a kind of Using zirconium silicate to wrap cadmium sulfide colorant in the production of cadmium-containing waste acid solution produced in the acid soaking process, directly recycle and reproduce the production method of zirconium silicate-wrapped yellow pigment; this method can effectively solve the problem of wrapping cadmium sulfide colorant with zirconium silicate The acid soaking cadmium-containing waste acid solution in production is difficult to deal with and pollutes the environment

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