Recycling of Cr/Ni/Cu plating wastes as black ceramic pigments
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Other documents of the author: Gargori, Carina; Prim, S. R.; Llusar, Mario; Folgueras, M. V.; Monrós, Guillermo
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Title
Recycling of Cr/Ni/Cu plating wastes as black ceramic pigmentsDate
2018Publisher
ElsevierISSN
0167-577X; 1873-4979Type
info:eu-repo/semantics/articlePublisher version
https://www.sciencedirect.com/science/article/pii/S0167577X18302532Version
info:eu-repo/semantics/submittedVersionSubject
Abstract
The non-ferrous metal industry, such as Cr/Ni/Cu plating, produces acid sludge which is usually neutralized
with lime slurry in batch processes, and the resulting waste is dewatered by vacuum filtration or
filter- ... [+]
The non-ferrous metal industry, such as Cr/Ni/Cu plating, produces acid sludge which is usually neutralized
with lime slurry in batch processes, and the resulting waste is dewatered by vacuum filtration or
filter-pressing. Dewatered sludge contains calcium sulphate (CaSO4) coming from the neutralization process,
as well as transition metals (Cr, Ni and Cu), oil, grease and suspended solids. In this communication,
two residual sludges from Cr/Ni/Cu plating have been dried (110 C) and fired (1100 C), and both dried
(gray coloured) and fired powders (black coloured) have been characterized by DTA-TG, XRD and SEMEDX
techniques. XRD shows only quartz crystallization in dried samples, while NiCr2O4 chromite spinel
and NiO periclase crystallize in fired powders, along with CaSO4 anhydrite and CaSiO3 wollastonite. The
powders have been introduced as ceramic pigments into three different conventional glazes: a) a lead
bisilicate (PbO.2SiO2) double fire frit (1000 C), b) a double fire frit with low lead content (1000 C),
and c) a double fire frit without lead (1050 C). Glazed samples were characterized by UV-Vis-NIR (diffuse
reflectance) and CIEL⁄a⁄b⁄ (color parameters). Dried powders induce glaze defects (pin-holing and crawling),
but fired powders did not show these faults exhibiting more intense (higher L⁄
) and yellowish
(higher b⁄
) black colors than the standard spinel. [-]
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Materials Letters, Volume 218, 1 May 2018.Investigation project
P1.1B2015-19 Project ; MAT2015-69443-ProjectRights
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