It is becoming more popular to use anthracite for the remelting sulphur containing metals, and then desulfurize the steel melt. The downside of this method is that it's slow and generates large quantities of slag which can be difficult to transport. It is because lime has a disadvantage as a desulphurising material. It binds the sulphur, which prevents it from reacting to oxygen and forming carboxylic (CA).
A number of authors have investigated methods to improve the desulphurisation of sulphur-containing metals by using carbon-based materials. These carbons come from renewable materials such as sewage, waste or biomass. But they also include carbons that are not renewable, like petroleum coke and athanacite. These studies are mainly focused on the desulfurisation and reactivity of carbon-based materials. They do not address the environmental issues (metal leaching species and the production of waste), economic issues and life cycle assessment.
In this invention, anthracite-based charbon has been modified to increase the reactivity of it and its desulphurisation ability. This has been achieved by imprégnating carbon with pyrolysis fuel obtained through the thermal treatment of waste auto tires. The addition of pyrolysis oils increases the anthracite's reactivity by reducing the minimum ignition temperatures and ignition delay times. By adding a catalyst for denitrogenation, the anthracite reactivity is increased.
In order to test the reactivity in the anthracite fuel, tests were carried out with two Pennsylvanian anthracite culls (the Jeddo or Emerald culms), bituminous coals from NARCO as well as the mixture of NARCO's coal and Emerald culls at 75/25 percent. The Figure 2 illustrates the weight loss curves from each of these fuels.
PUPW, coconut shell and petroleum char were ground into powders and sieved at a 100 mesh particle size. The powdered materials were then pyrolysed for 4 hours in a N2 atmosphere at 800 degrees Celsius to reach temperature equilibrium. The resulting carbonaceous residual was activated using 4 ml 4 mol/l solution nitric at room temperatures for 3 h. The XRD spectra of the four ACAs showed that PUPW-ACA, CS-ACA and PC-ACA have similar peak intensities, but they have lower crystallinties.
Statistic adsorption has been used to determine the adsorption characteristics of all four types. The results indicated that the HHV of the anthracite-based ACA was the highest, followed by CS-ACA and then by PC-ACA. The high HHV for anthracite carbon is due mainly to the large amount of nitrogen-containing group. The results from the adsorption tests suggest that the chemistry based on anthracite may be more effective than current technologies at desulphurising metallic melts with sulphur.
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