Fundamental understanding on the use of different carbon sources in the alternative ironmaking HIsarna process

HIsarna process offers a low CO2 emission alternative to the blast furnace for hot metal production. This new smelting ironmaking technology is flexible in raw materials such as substitution of coal with biomass. The reduction process is conducted through multiple mechanisms within the smelting reduction vessel (SRV) including reactions of the gaseous products from thermal decomposition of carbonaceous materials with iron oxide in slags. Since the construction of the HIsarna pilot plant (at the capacity of 8t hot metal/hour) in Tata Steel site in the Netherlands in 2010, several successful trial campaigns have been completed using thermal coals. Campaigns to partially replace coal with biomass and charge steel scraps in the SRV were also successfully conducted since 2018 demonstrating further significant CO2 emission reduction, however, the change in process performance due to biomass injection was noticed. To advance the fundamental understanding of the use of different carbonaceous materials in the HIsarna process and help optimise the carbonaceous material selection, a systematic research has been carried out for different carbon sources under simulated HIsarna thermal conditions. The thermodynamic and kinetic behaviours of the carbon-gas-slag-metal systems have been studied for coal and biomass injection in laboratory experiments. This talk will introduce some research findings from this systematic research, including slow/rapid devolatilisation of the carbon sources injected, structural characteristics of the resultant chars, and slag-carbon reactions for coals and biomass

Measurements of the Total and Differential Higgs Boson Production Cross Sections Combining the H??????? and H???ZZ*???4??? Decay Channels at s\sqrt{s}=8??????TeV with the ATLAS Detector

Measurements of the total and differential cross sections of Higgs boson production are performed using 20.3~fb$^{-1}$ of $pp$ collisions produced by the Large Hadron Collider at a center-of-mass energy of $\sqrt{s} = 8$ TeV and recorded by the ATLAS detector. Cross sections are obtained from measured $H \rightarrow \gamma \gamma$ and $H \rightarrow ZZ ^{*}\rightarrow 4\ell$ event yields, which are combined accounting for detector efficiencies, fiducial acceptances and branching fractions. Differential cross sections are reported as a function of Higgs boson transverse momentum, Higgs boson rapidity, number of jets in the event, and transverse momentum of the leading jet. The total production cross section is determined to be $\sigma_{pp \to H} = 33.0 \pm 5.3 \, ({\rm stat}) \pm 1.6 \, ({\rm sys}) \mathrm{pb}$. The measurements are compared to state-of-the-art predictions.Measurements of the total and differential cross sections of Higgs boson production are performed using 20.3  fb-1 of pp collisions produced by the Large Hadron Collider at a center-of-mass energy of s=8  TeV and recorded by the ATLAS detector. Cross sections are obtained from measured H→γγ and H→ZZ*→4ℓ event yields, which are combined accounting for detector efficiencies, fiducial acceptances, and branching fractions. Differential cross sections are reported as a function of Higgs boson transverse momentum, Higgs boson rapidity, number of jets in the event, and transverse momentum of the leading jet. The total production cross section is determined to be σpp→H=33.0±5.3 (stat)±1.6 (syst)  pb. The measurements are compared to state-of-the-art predictions.Measurements of the total and differential cross sections of Higgs boson production are performed using 20.3 fb$^{-1}$ of $pp$ collisions produced by the Large Hadron Collider at a center-of-mass energy of $\sqrt{s} = 8$ TeV and recorded by the ATLAS detector. Cross sections are obtained from measured $H \rightarrow \gamma \gamma$ and $H \rightarrow ZZ ^{*}\rightarrow 4\ell$ event yields, which are combined accounting for detector efficiencies, fiducial acceptances and branching fractions. Differential cross sections are reported as a function of Higgs boson transverse momentum, Higgs boson rapidity, number of jets in the event, and transverse momentum of the leading jet. The total production cross section is determined to be $\sigma_{pp \to H} = 33.0 \pm 5.3 \, ({\rm stat}) \pm 1.6 \, ({\rm sys}) \mathrm{pb}$. The measurements are compared to state-of-the-art predictions