Method for preparing gilvous occlusion pigment from cadmium-containing waste acid solution generated in acid pickling process

Abstract

The invention discloses a method for preparing a gilvous occlusion pigment from cadmium-containing waste acid solution generated in an acid pickling process. Cadmium-containing wastewater generated in the acid pickling process is directly utilized to produce a zirconium silicate microcrystal occluded cadmium sulfide pigment, and zinc ions are doped by virtue of introduction of zinc sulfate to form a cadmium sulfide and zinc sulfide solid solution color former which is used for producing the zirconium silicate microcrystal occluded zinc cadmium sulfide pigment. According to the invention, zirconium oxychloride, zinc sulfate and waste acid solution containing cadmium and selenium generated in the acid pickling process as well as sodium hydroxide and sodium sulphide are subjected to chemical coprecipitation reaction in a reaction kettle, filter-pressed and washed, and dried; and then the above reaction product is evenly mixed with a mineralizer and white carbon black according to a certain ratio and calcined at a high temperature, and the calcined product is acidized, ball-milled, filter-pressed, washed and dried to obtain the zirconium silicate occluded cadmium sulfide yellow pigment or zirconium silicate occluded zinc cadmium sulfide gilvous occlusion pigment product. The gilvous occlusion pigment can replace praseodymium yellow pigment for use.

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, ...

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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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