this study was mainly designed to investigate and identify the amounts and types of heavy metals in the soils of national iranian oil refining & distribution company in shahrood region and tried to establish a logical relation between the presence of heavy metals and their damage on vegetation. in addition, considering the power of drained soil and due to the proximity of ground water in shahro...

At the International Nickel Company (INCO) nickel refinery in Clydach, Wales, U.K., which has operated since 1901, 365 respiratory cancers, including 85 nasal cancers and 280 lung cancers, have occurred in workers since the 1920s. From 1901 to 1923, incidences of these cancers were high. In 1923, the refining process was changed, eliminating a nickel arsenide, Ni5As2, called orcelite, from the ...

In this study the TIG process was used to perform surface treatment of Nickel-Aluminium Bronze alloy (C63280), main material in industry for manufacture naval propellers. The applied specimens obtained from a propeller blade at different current pulsation frequencies (2, 5, 6, 12 Hz and 30 kHz) without pulsation. treatments were submitted microstructural microhardness analysis, results compared...

BACKGROUND In some parts of the northwest Russia, Murmansk region, high exposures to heavy mining and refining industrial air pollution, especially sulphur dioxide, have been documented. OBJECTIVE Our aim was to evaluate whether living in the mining area would be an independent risk factor of the respiratory symptoms. DESIGN A cross-sectional survey of 200 Murmansk region adult citizens was...

Objective: To evaluate marginal discrepancies between cast implant superstructure and EDM processed implant structure. Materials and methods: For the purpose of this study, an experimental model was prepared on which nine cast implant superstructure in nickel-chromium were fabricated which was then subjected to EDM processing. One-screw test was used to verify fit of superstructure both preand ...

The aim of the study was to develop a process option for value addition leach residue from hydrometallurgical nickel refining. in question is copper-rich (58 %) with sulphur (23 %), (3 and iron (2 as other main constituents. prevailing phases are covellite antlerite already marketable product such. current suggests flow sheet moderate temperature autogenous pressure leach, selenium removal copp...

AIM To investigate the morphological changes in the apical third of the root canal after preparation with three techniques. METHODOLOGY Forty molar teeth were scanned using micro-computed tomography before and after instrumentation with: Group 1 - stainless steel K-files using the balanced force technique; Group 2 - stainless steel K-files (balanced force) and then refining the apical prepara...

Copper sulphide rich leach residue from nickel refining is a marketable product and may be treated by smelting. In looking for another technology its valorisation, the raw material was characterised suitability of medium-temperature sulphate-based pressure leaching tested this purpose. The contained 58% copper carried in covellite oxides. Using favourable conditions, about two hours needed comp...

Abstract Transportation is one of the main sectors contributing to greenhouse gas (GHG) emissions that cause global climate change. One decarbonization strategies from transportation sector can be implemented by switching a sustainable mode transportation, especially battery electric vehicles (BEV). Since mid-2021, Obi Island has been producing Mixed Hydroxide Precipitate (MHP). It an intermedi...