نتایج جستجو برای: metal refining
تعداد نتایج: 208440 فیلتر نتایج به سال:
The processing of mined and beneficiated ores, concentrates or mattes to produce refined metallic products is an important step in the production of base metals such as zinc, copper and nickel. Despite increased recycling, as well as first tentative steps towards dematerialization of economic activity in industrialized countries, prospects are positive for continued growth in demand for these c...
Mercury pollution threatens the environment and human health across the globe. This neurotoxic substance is encountered in artisanal gold mining, coal combustion, oil and gas refining, waste incineration, chloralkali plant operation, metallurgy, and areas of agriculture in which mercury-rich fungicides are used. Thousands of tonnes of mercury are emitted annually through these activities. With ...
introduction: water scarcity is an important challenge worldwide, especially in arid and semi-arid regions. in these areas, the excessive exploitation of groundwater for irrigation, inefficient irrigation methods, irrigation with low-quality water and uncontrolled utilization of fertilizers in agricultural lands in addition to contamination of water resources by domestic and industrial wastewat...
Inspired by Cardelli’s pioneering work, many type disciplines for object-oriented programming are based on enrichments of structural type theories with constructs such as subtyping and bounded polymorphism. A principal benefit of such a formulation is that the absence of “message not understood” errors is an immediate corollary of the type safety theorem. A principal drawback is that the result...
Recently, wastewater treatment by photocatalytic oxidation processes with metal oxide nanomaterials and nanocomposites such as zinc oxide, titanium dioxide, zirconium dioxide, etc. using ultraviolet (UV) and visible light or even solar energy has added massive research importance. This waste removal technique using nanostructured photocatalysts is well known because of its effectiveness in disi...
Occupational exposures to inhalation of certain metal dusts or aerosols can cause loss of olfactory acuity, atrophy of the nasal mucosa, mucosal ulcers, perforated nasal septum, or sinonasal cancer. Anosmia and hyposmia have been observed in workers exposed to Ni- or Cd-containing dusts in alkaline battery factories, nickel refineries, and cadmium industries. Ulcers of the nasal mucosa and perf...
The study aims was to examine the relationship between demographic factors and effective motivation of knowledge transfer and experience between Employees of Isfahan Oil Refining Company. It was used a survey-descriptive method in this research and the population under investigating includes all managers and employees of Isfahan Oil Refining Company. To determine the sample size, it was used th...
Despite numerous researches on organizational performance, no research has been conducted in the headquarters of the National Research Refining and Distribution Company in order to provide a constructed method for resolving existing inconsistencies in the way of improvement and effective management. Therefore, the main question of this research is that high performance working methods by improv...
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