Influence of chrome-bearing sols vacuum impregnation on the properties of magnesia-chrome refractory

Liquidus experimental data for the system Cu-O-Cr2O3 in air

“…Magnesia-chrome bricks are the most utilized type of refractory in copper making furnaces today [1,2]. Cr2O3 content of this type of refractory can be as high as 20 wt %.…”

The effect of phase formation during use on the chemical corrosion of magnesia–chromite refractories in contact with a non-ferrous PbO–SiO2 based slag

“…Alternatively the bricks can be pretreated (second category), for example by laser melting of the surface [15,16], which after cooling, results in a dense surface layer, preventing infiltration. Deng et al [17] used vacuum impregnation with Cr2O3 or MgCr2O4 sols and subsequent firing of the brick as a method to lower the pore size and change the wetting properties (as more chrome rich phases are present at the surface of the pores), thereby slowing down the slag infiltration. Finally, the process itself (third category) can be modified to reduce infiltration.…”

Topotactic Transformation of Solvated MgCr-LDH Nanosheets to Highly Efficient Porous MgO/MgCr2O4Nanocomposite for Photocatalytic H2Evolution

“…20,21 However, owing to poor photoelectric conversion and competing thermodynamic stability of Cr 2 O 3 with MgCr 2 O 4 resulting as biphasic MgCr 2 O 4 −Cr 2 O 3 , most of the current study about MgCr 2 O 4 is mainly limited in the field of combustion catalyst 22 and ceramic refractories. 23,24 Nitta et al reported a binary MgCr 2 O 4 −TiO 2 system, which is very important in refractories because of maintaining good mechanical and thermal stabilities at high temperatures. 25 Furthermore, there is no report on photocatalytic application of MgCr 2 O 4 up to now apart from the report about the oxidative degradation of Xylenol Orange and photodegradation of Rhodamine-6G dyes as environmental pollutants by Nagarajan et al in 2015.…”

“…Two-dimensional (2D) layered nanostructured materials triggered hot research spot for photocatalytic H 2 production with the primary goal being improved charge carrier separation, transport characteristics, short lateral diffusion length, and morphological aspects to improve apparent conversion efficiency. − Among various Cr-based multicomponent spinel-type metal oxides, magnesium chromite, symbolized as MgCr 2 O 4 , materials have received special attention due to their unique crystalline structure and remarkable properties toward magnetism, − interconnection material for solid fuel cells, high temperature ceramics, humidity sensor elements, catalysts support, strengthening agents, and combustion catalysts. − Recent reports have highlighted the potential of MgCr 2 O 4 as an efficient photocatalyst . MgCr 2 O 4 is a narrow band gap semiconductor with band gap lying within 1.3 to 1.8 eV and crystallizes in normal cubic spinel structure in which the bivalent Mg-ions occupy the tetrahedral sites and the trivalent Cr-ions hold the octahedral sites. , The heterogeneous cationic substitution could lead to multiple valence states at these multimetal centers and reduce the activation energy for electron transport between cations and endow desirable electronic conductivity. , However, owing to poor photoelectric conversion and competing thermodynamic stability of Cr 2 O 3 with MgCr 2 O 4 resulting as biphasic MgCr 2 O 4 –Cr 2 O 3 , most of the current study about MgCr 2 O 4 is mainly limited in the field of combustion catalyst and ceramic refractories. , Nitta et al reported a binary MgCr 2 O 4 –TiO 2 system, which is very important in refractories because of maintaining good mechanical and thermal stabilities at high temperatures . Furthermore, there is no report on photocatalytic application of MgCr 2 O 4 up to now apart from the report about the oxidative degradation of Xylenol Orange and photodegradation of Rhodamine-6G dyes as environmental pollutants by Nagarajan et al in 2015 .…”