The main components used in smelting remain ore, reductants and fluxing agents.A technological solution was needed to extract chrome from the ore in a particularly efficient manner to ensure cost competitiveness. However, the emphasis on improving recovery and cost efficiency has seen the emergence of more acidic (SiO2-rich) slags and the use of a wider variety of reductants, with the growing use of larger quantities of metallurgical coal to replace coke. The basics of the smelting process have remained relatively unchanged.
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Screening machine will separate the undesired size materials from the end products. The crushing stage can be realized by mobile jaw crusher, portable cone crusher and the mobile impact crusher machine.The stone ore processing line includes crushing and screening two main parts.
The paper was funded by an internal project of the National Research Centre. The number of the project is 11030130 and the principal investigator is Prof. Hala Mohamed Safwat El Bassiouny. Dr.
Wang Y, Zhang H, Wu Y, Yang J, Zhang L (2005) Structure and properties of strain-induced crystallization rubber–clay nanocomposites by co-coagulating the rubber latex and clay aqueous suspension. J Appl Polym Sci 96:813–823.
It was assumed that the agglomeration occurred between POA nanoparticles due to the increase in surface area and energy of POA nanoparticles. From the TEM image, the POA nanoparticles appear in black colour. Hence, the POA particles resist being fractured and flattened, causing particles to obtain a size more than 100 nm.Transmission electron microscope (TEM) micrograph visualized the morphology and distribution of POA nanoparticles. The results confirming the success of Taguchi statistical analysis in obtaining optimal parameters to produce POA nanoparticles were presented in Table 6. Therefore, the confirmation test indicated that the results obtained from the selection of optimal parameters could produce a significant size of palm oil ash (POA) nanoparticles. In this study, the ball milling process involved complex mechanical forces such as particles that are repeatedly fractured and flattened. The black colour was probably due to that less transparent towards electron beam and electronic density of POA nanoparticles element as reported by Pishvaei, Farshchi , Yazdimamaghani, and Pourvala . This similar finding also reported by Abdul Khalil and Rus Mahayuni  that ground POA particles had an irregular shape and the size was measured less than 50 nm. In addition, within that nanometric range, there was slightly an agglomeration that occurred between POA nanoparticles. Figure 7 showed the TEM image of POA nanoparticles, which is in accordance with the particle size distribution, which is evaluated by laser diffraction particle size analyzer. The TEM micrograph reveals that the POA nanoparticles possess an irregular size and uniformly distributed within 70 to 200 nm range without having agglomeration. Moreover, the TEM image supplies quantitative information about the shape, size, and distribution of particles on a very local scale. In the case of the spherical shape of POA nanoparticles that can be observed in the TEM image, it is probably due to the balanced formation of milling force between balls, milling jar, and POA particles.
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