Resource and sustainable utilization of quartz sand waste by turning into cobalt blue composite pigments

Utilization of Sea Sand for Preparation of High-Performance CoAl2O4 Composite Pigments via a Cleaner Mechanochemistry Route

“…as well as its strong covering and refractive power. , However, the wide applications of CoAl 2 O 4 are constrained owing to the scarcity and strategic position of cobalt ore on earth, and thus it is still a challenge to reduce the consumption of cobalt to a maximum degree while simultaneously retaining or enhancing the color properties of CoAl 2 O 4 pigments. Recently, it has been confirmed that incorporation of inorganic substrates, especially clay minerals, can sharply reduce the consumption of cobalt sources and prevent the aggregations of CoAl 2 O 4 nanoparticles. , Compared with good quality clay minerals, discarded tailing sand separated during mineral processing also served as a substrate to fabricate a low-cost and high-chroma cobalt blue composite pigment in our previous study. , However, it is inevitable to involve a strong alkaline reagent and discharge large amounts of waste water during the coprecipitation process. Inspired by the CoAl 2 O 4 composite pigments derived from the discarded tailing sand, it is necessary to study the feasibility of constructing CoAl 2 O 4 composite pigments using sea sand via a cleaner preparation route.…”

“…14,15 Compared with good quality clay minerals, discarded tailing sand separated during mineral processing also served as a substrate to fabricate a low-cost and high-chroma cobalt blue composite pigment in our previous study. 16,17 However, it is inevitable to involve a strong alkaline reagent and discharge large amounts of waste water during the coprecipitation process. Inspired by the CoAl 2 O 4 composite pigments derived from the discarded tailing sand, it is necessary to study the feasibility of constructing CoAl 2 O 4 composite pigments using sea sand via a cleaner preparation route.…”

Sustainable utilization of natural sands for cleaner preparation of high-performance nanostructured cobalt blue composite pigments by dolomite-induced mechanochemistry

“…not only reduced the added amount of cobalt sources, but also affect the transitions of four-coordinated Co 2+ to regulate the blue intensity of CoAl 2 O 4 pigments by distorting the crystal structure. 14,[20][21][22] Especially, Mg 2+ can enter into the tetrahedral sites of spinel CoAl 2 O 4 and form a solid solution with CoAl 2 O 4 , while the pigments were composed of the mixed phases of CaAl 2 O 4 and CoAl 2 O 4 aer the incorporation of Ca 2+ due to the difference in the ionic radius and coordination numbers between the introduced metal ions and Co 2+ . 20,21 However, the relevant liquid-phase preparation routes unavoidably involved the use of a large volume of solution, strong alkaline or organic reagents, and the discharge of waste liquid with a low yield.…”

An insight into the firing conditions of Chinese blue-and-white porcelain through XANES

“…24 Other studies have investigated cobalt aluminate pigments through different techniques, to understand the effect of the firing temperature, production route and colour since they are still widely used pigments in the ceramic industry. 25–27…”