removing titanium dioxide from surfaces

From a stability standpoint, lithopone, a fusion of zinc sulfide and artificially precipitated barite, is non-toxic and exhibits resilience to mild lyes and acids. However, it is incompatible with colors containing copper. Despite its strong covering power in oil, lithopone’s drying capabilities are notably limited, posing potential issues for artists. Notably, early experimentation with lithopone-based grounds instead of zinc white resulted in undesirable darkening, although this blackness receded upon drying. This unpredictable behavior has sparked debate among scientific communities, emphasizing the need for further exploration and understanding of this pigment.

...

China's lithopone industry has been a significant player in the global market for several decades. Lithopone, also known as zinc sulfide white, is an inorganic pigment that finds applications in various industries such as coatings, plastics, rubber, and paper. This article provides a comprehensive guide to understanding the lithopone factory in China, including its history, production process, market trends, and environmental concerns.

...

Second, the present invention provides a large-scale industrial production process with low production cost, high efficiency, energy saving, and stable product quality with an annual production capacity of several hundred thousand tons. Selective leaching of zinc by ammonia method, combined with ammonium persulfate iron removal, vulcanization method and zinc powder replacement method to remove heavy metal elements such as nickel, copper, lead, cadmium and arsenic, and metathesis reaction to obtain nZnS-B a S0 4 crystal filter cake. The nano-Lide powder product is obtained by directly drying and pulverizing without high-temperature calcination. The resulting product is of good quality and industrially operable.

...