Evaluation of extracting titanium dioxide from water-based paint sludge in auto-manufacturing industries and its application in paint production

Abstract

Almost 2555-4380 tons of paint sludge are produced annually in an auto-manufacturing plant; recycling and reproduction of beneficial materials such as titanium dioxide (TiO2) and its application in paint production from paint sludge are evaluated in this article. The disposal of these sludge is environmentally important and is the main and most serious challenge for auto-manufacturing units. Today, these sludge are recognized as toxic wastes, whose disposal is much costly and constrained by environmental standards. Controlled disposal requires spaces, which are expensive and impermeable, because the sludge contains large amounts of hazardous materials such as heavy metals, solvents, and other materials polluting wells, springs, and other water resources. In this research, X-ray diffraction spectroscopy was carried out to determine the types of sludge combinations. Then, chemical digestion and centrifuge was used to extract TiO2, the extracted TiO2 reached 67.41% using these techniques. Next, a powder containing TiO2 in a certain percentage was used for paint production. Here, not only the amount of sludge decreased to as much as 70% but also the fresh paint required annually will be reduced by 21%. Furthermore, all heavy metals and toxic wastes will be removed as an environmental challenge.

Reduction of COD in water-based paint wastewater using three types of activated carbon

“…These options included the use of sludge as an additive to Portland cement, the recovery of some of its valuable components through pyrolysis, or its conversion into reusable paint. Recently, Kherzi et al [49] investigated the option of extracting titanium dioxide from water-based paint sludge and indicated its viability for reuse in paint production, an option which may become economically viable in the future.…”

Caracterización de lodos de industrias para un posible aprovechamiento en artes

“…Additionally, as Ti is more expensive than other metals and since it makes up a bigger fraction of the sludge than other metals, extraction and purifying techniques can be suggested to reuse it as a pigment or a burden. For this, digestion with sulfuric acid and subsequent centrifugation can be used (See Figure 3) (Khezri et al, 2013), which will produce a concentration of TiO2 in the mixing matrix.…”

Visible-Light Active Titanium Dioxide Nanomaterials with Bactericidal Properties

“…Therefore, plaint sludge is always found in the paint-bearing wastewaters. The recycling and reproduction of TiO 2 NPs from the paint sludge are beneficial to both the environmental and industrial sectors for minimizing pollution [312]. Furthermore, embedded TiO 2 NPs in the paint of buildings, bridges and traffic railings could be lost and released into the aquatic environment due to a lengthy outdoor weathering [313].…”