Study on the Possibility of Using ZnO for Hot Metal Desulfurization

Abstract

The possibility of using ZnO for desulfurization in hot metal has been evaluated. A experimental setup has been designed so that different desulfurizing agents could be added to hot metal for evaluation of their desulfurizing power. Additions of ZnO into the hot metal under various experimental conditions shows no effect on desulfurization. The results are in contradiction to the suggestion found in literature. A thorough examination of the thermodynamic data employed by the previous work has been carried out.

Colorimetric sensing of calcium carbide over banana peels using 5,5′-dithiobis-(2-nitrobenzoic acid) (DTNB) as a rapid chemoreceptor: a point of care tool for food fraud analysis

“…This contaminant is produced during steel desulfurization in steel plants. [4][5][6] When DTNB reacts with a free sulfhydryl group, mixed disulfide and TNB acid are formed [Fig. 2(F)].…”

“…There is a significant amount of ''CaS'' (sulfides) present in CaC 2 organically, as well as in the CaC 2 coming from steel industries after the desulfurization process. [4][5][6] CaC 2 is widely used commercially and at home to accelerate the artificial ripening of fruits and crops. 7,8 India is leading the world in banana, papaya, and mango production.…”

“…The DTNB assay is used to assess enzyme activity; it detects sulfide bonds and targets them for cleavage, resulting in ions that are responsible for colorimetric signals. 49,50 To monitor the presence of CaC 2 in banana peels, we focused on the high sulfide impurity ''CaS'' present in commercial CaC 2 , [4][5][6] and a new method was validated, and a solution-based easy colorimetric CaC 2 sensor was developed using the DTNB-based method as 1st screening for artificially ripened bananas. As a proof of concept for real-time detection, bananas were used as the model sample in this study.…”

Estudo da substituição da fluorita por alumina ou sodalita e de cal por resíduo de mármore em escórias sintéticas dessulfurantes.

“…Entretanto, este trabalho sofreu críticas de David et al (23) . Segundo os autores, o zinco em nada interfere na dessulfuração.…”