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Coke plant Sintering Steelmaking Hot Rolling Steel Use Coke plant Sintering Steelmaking Hot Rolling Steel Use Coke plant Sintering Steelmaking Hot Rolling Steel Use Coke plant Sintering Steelmaking Hot Rolling Steel Use Coke plant Sintering Steelmaking Hot Rolling Steel Use
The objective of the automatic combustion control is to guarantee
the operational stability of the coke batteries based on the control
of the coking time and consequently, minimize the reduction of useful
life of the ovens. This control is guided by a mathematical model
whose inputs are process variables and raw materials parameters
and outputs are combustion parameters. Therefore, this paper will
present the evolution of the performance of the burning process,
providing a stability of the coking time.
Anthracite coal as fuel for iron ore sintering is compared with
coke breeze. Anthracite is lower in porosity, higher in density, and
slower in combustion rate. With higher proportion of anthracite in
fuel, permeability of sinter bed tends to decrease resulting in lower
sinter productivity. Higher fuel rate with more replacement of coke
breeze by anthracite is ascribed to the lower density of heat source
particles and to the lower heat value and more volatile matters of
anthracite. A smaller particle size for anthracite is recommended.
Some subsidiary heat sources such as magnetite ore and mill scale
could be helpful for more uniform sintering.
Dissolution of ZrO2 oxide in synthetic CaO - Al2O3 - SiO2 -
Na2O - B2O3 mould fluxes was investigated in situ using a
Confocal Scanning Laser Microscope (CSLM). Evolution of
particle radius with time is obtained exhibiting strong dependence
on temperature and basicity of the mould fluxes. The
rate-limiting step of the dissolution process was discussed, and
basicity was shown to significantly influence the rate-limiting step.
In most cases, hot metal dephosphorization slag is saturated with
dicalcium-silicate that forms complete solid solution with tricalciumphosphate;
the partition ratio of phosphorous between C2S and
liquid slag is large. In order to utilize the effect of C2S phase for the
improvement of reaction efficiency, the optimum route of the slag
composition change during dephosphorization should be clarified.
The results of the fundamental experiments about the phosphorous
partition between C2S and liquid slag from the viewpoints of equilibrium
and kinetics are reported.
Titanium-stabilized ultra-low carbon steels are often used in surfacequality
critical applications and also susceptible to clogging
problems in the casting process. The Automated Steel Cleanliness
Analysis Tool (ASCATTM), based on computer-controlled scanning
electron microscopy, was used to quantify the content and
compositions of inclusions present in the steel. The effects of alloy
addition timing at the RH degasser and of tundish slag composition
on cleanliness in these grades are discussed.
With extremely high cooling rates, a combined laminar jet and
spray nozzle design cooling facility is the most advanced tool for
the evolution of mechanical properties of high-strength steels. The
main metallurgical aspects of Accelerated Cooling (ACC) and
Direct Quenching (DQ) are presented. Typical plate applications
are brought up. Design, engineering and operational aspects of
modern cooling facilities are explained. Of particular importance
for a homogenous cooling process is a powerful process control
featuring advanced process models.
The corrosion risks in a wet flue gas desulphurization system
environment are reported. Uniform and localized corrosion
resistance of different stainless steels is studied by electrochemical
tests. The effects of chloride content, fluoride content, pH and
temperature on corrosion resistance are discussed. The results show
that duplex UNS S32205 or superduplex UNS S32520 grades
are prime substitutes for austenitic 317LNM or super austenitic like
UNS S34565 grades in many aggressive environments. The life
cycle costs of scrubbers constructed of stainless steels plates or clad
plates are compared. The excellent corrosion resistance of duplex
and superduplex stainless steels, combined with their increased
mechanical properties and moderate alloy cost afford very cost
effective solutions for wet flue gas desulphurization.