In the process of smelting copper mineral a large amount of sulphuric dioxide (SO2) is produced. This compound would be highly pollutant if it was emitted to the atmosphere. By means of an acid plant it is possible to transform it into sulphuric acid, using for this a set of chemical and physical processes. In this way we dispose of a marketable product and, at the same time, the environment is...

Arsenic is a well-known toxic chemical and listed as a known carcinogen by the Environmental Protection Agency (EPA) and the World Health Organization (WHO, 2001). It is the 20 abundant element in the earth s crust but is widely distributed in the environment being released from both natural sources, e.g. by volcanic action, during weathering of rocks and mining as well as from anthropogenic on...

BACKGROUND Work-related COPD occurs as a result of exposure to harmful particles and gases/fumes in the workplace, including among non-smokers. The objective of this article is to present more recent findings on the correlation between occupational exposure and COPD. In addition, we review diagnostic and prognostic considerations and the potential for prevention. METHOD We have undertaken lit...

Food safety is a major concern for the Chinese public. This study collected 465 published papers on heavy metal pollution rates (the ratio of the samples exceeding the Grade II limits for Chinese soils, the Soil Environmental Quality Standard-1995) in farmland soil throughout China. The results showed that Cd had the highest pollution rate of 7.75%, followed by Hg, Cu, Ni and Zn, Pb and Cr had ...

Due to growing concern over environmental impacts and the pressure lower carbon footprints in metals industry, hydrogen (H2) has gained attention as a promising alternative for replacement of reductant fuel. This paper evaluates potential use an energy source reducing agent during processing waste printed circuit boards (waste PCBs) from e-waste through black copper smelting. The effect reducti...

CO2 has characteristic properties and reactions at the converter smelting temperature, chemical reaction between elements such as C Si in molten pool bubble proliferation cooling effects, which can effectively improve kinetic thermodynamic conditions of smelting. Here, an experimental study industrial test on application were carried out. The effects Mode-1 Mode-2 with total injection amounts 2...

We analyzed blood lead (PbB) level from the 2003 health surveillance results of 13,043 lead workers from 1,217 total lead industries to evaluate lead intoxication at low level in Korea. Geometric mean of PbB was 6.08 microg/dl and 56.6% and 7.9% of total lead workers had PbB level over than 5 microg/dl and 25 microg/dl, respectively. Male showed relatively higher PbB level compared to women, bu...