Results 1 - 10 of 511
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[en] A paper about the corrosion in blast furnaces is presented. after studies on distribution and installation of radioactive sources with low activities in the refractory lining, it was possible to develop a new technique of thickness evaluation and attendance of wearing in the furnace lining. (E.G.)
[pt]Apresenta-se um trabalho sobre desgaste do revestimento refratario de altos fornos. Atraves de estudos sobre a distribuicao e instalacao de fontes radioativas de baixa atividade, conseguiu-se desenvolver uma tecnica de avaliacao da espessura e acompanhamento do desgaste do revestimento refratario. (E.G.)
[en] A critical review on the alternative processes to the blast furnace, involving both solid and liquid state reduction is presented. Process comparison allows to identify advantages and disadvantages of each type of processes as well as to highlight the major challenges faced in order to compete with the traditional iron making route: the blast furnace, which today rules the production of iron units worldwide. (Author) 31 refs
[en] The fitness for granulation of a ore mixture used to make a series of sintering in a pilot plant is studied. The quality indexes and the phases composition of sintering is determined. The best sintering structure is checked. A series of iron ores is classified as the granulation index (G index). The G index evolution of the ore mixture used by ACERALIA for the last years is shown. An increase in productivity and a decrease in coke consumption in the sinter strand is observed as the G index improves. (Author) 15 refs
[en] This document presents a literature study of the impact of glycolate on technetium chemistry in the Savannah River Site (SRS) waste system and specifically Saltstone. A predominant portion of the Tc at SRS will be sent to the Saltstone Facility where it will be immobilized. The Tc in the tank waste is in the highly soluble chemical form of pertechnetate ion (TcO4 -) which is reduced by blast furnace slag (BFS) in Saltstone, rendering it highly insoluble and resistant to leaching.
[en] In the heavy iron-making industry there are several processes for which it is necessary to measure on-line the moisture content of certain process materials, especially in the field of iron ore preparation and blast furnace practice. Two examples are given. (1) Experience with nuclear moisture-measurements in coke covers a period of ten years in which eight measuring systems have been installed in the weighing hoppers of blast furnaces. The standard deviation is about 0.7% moisture in the range 0 to 15% moisture. The way the method is used, the safety measures and the difficulties encountered, especially the effect on recalibration of neutron-absorbing materials in photomultipliers are described. (2) The application of infrared absorption to the study of moisture measurment or iron ore mixtures is described. With an ore mixture for pellets manufacture, a rather dark ore mixture, problems have arisen concerning the sensitivity. The reference and measuring wavelengths now in use are 2.51 and 2.95 μm. In this case the absorption of the energy is rather high. The results may be improved by using quartz optics instead of the normal Pyrex ones, as the cut-off wavelength of Pyrex is about 3 μm. Variations due to colour and specific surface have been studied. As the accuracy required is +- 0.1% moisture in the range 8 to 12% moisture, these variations need to be eliminated. (author)
[en] It is imperative to achieve high coke replacement rates in blast furnaces which in turn are strongly influenced by the effects of combustibility of pulverized coal/coal blend due to extremely short residence time in the raceway. To overcome this issue, authors have developed a new methodology based on intrinsic properties of coal/coal blend to assess the suitability of pulverized coal injection grade coal for blast furnace application, named as Composite Burnout Potential (CBP). The CBP values evaluate the combustibility of a coal/coal blend in a vertical drop tube furnace at three different oxygen concentrations viz., 21%, 25%, and 31%. The results confirm that CBP and burnout of coal /coal blend are in close proximity. Drop tube furnace data was used for development and validation of the CBP model. The technique was successfully used for predicting the combustibility of coal/coal blend for better application in the blast furnace.
[en] This project was initially targeted to the making of coke for blast furnaces by using proprietary technology of Calderon in a phased approach, and Phase I was completed. The project was then re-directed to the making of iron units. U.S. Steel teamed up with Calderon for a joint effort which will last 30 months to produce directly reduced iron with the potential of converting it into molten iron (hot metal) consistent with the Roadmap recommendations of 1998 prepared by the Steel Industry in cooperation with the Department of Energy. The work which is labeled as Phase II will take place at two levels; namely, the bench scale level and the process development unit (PDU) level