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 2) Purification: Add ammonium persulfate to the final immersion solution for one-time oxidation and iron removal, and add activated carbon to adsorb arsenic and iron co-precipitation to achieve the purpose of removing arsenic. Add the polyacrylamide coagulant to separate and filter before separation. The sulfide solution is added to the solution to remove sulfur, and the separated filtrate obtained by the separation is replaced with zinc powder to remove the remaining impurities to obtain a zinc sulfate ammonia complex liquid, which is used in the next step;

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Once the TiO2 is extracted, the focus shifts to rendering it dissolvable. This is achieved through a surface modification technique, where the particles are coated with a specific compound that allows them to disintegrate when exposed to certain conditions, such as water or specific pH levels. These coatings could include organic acids, polymers, or even other inorganic materials, ensuring the controlled dissolution of the titanium dioxide.

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