نتایج جستجو برای Leaching

تعداد نتایج: 4021  

2015

Bacterial leaching is the extraction of metals from their ores using microorganisms. The most important player in the bioleaching process is. 4 Bacterial Attachment on Mineral Surfaces 200. 5 Microbial Diversity in Bioleaching Environments 200. Minerals are obtained using a leaching process.greater understanding of the mechanism of bacterial leaching of sulphide minerals. This latter process wh...

2005
C. Acharya, R. N. Kar, Vibhuti N. Misra,

Bioleaching is technologically feasible for extraction of manganese from low grade ores (containing manganese less than 35% by weight). The principle involves the non-enzymatic reduction of pyrolusite [Mn(IV) oxides] to +2 oxidation state by fungi with the production of metabolites such as oxalic acid and citric acid. In the present investigation, a fungal strain, Penicillium citrinum was isola...

2000
T. M. Addiscott, D. Thomas,

Phosphate is usually the limiting nutrient for the formation of algal blooms in freshwater bodies, so tillage practices must minimize phosphate losses by leaching and surface run-off from cultivated land. Mineral soils usually contain 30±70% of their phosphate in organic forms, and both organic and inorganic phosphate are found in the soil solution. Some organic phosphates, notably the inositol...

2001
K. Thomas,

Fig. 1. An engineering technologist sets up an apparatus in which PCB-contaminated liquid will be exposed to chemicals which remove the chlorine from the compound, transforming the PCBs into non-regulated chemicals. Base-catalyzed destruction (BCD) of polychlorinated biphenyls (PCBs) is a process in which the halogen molecules on PCBs are replaced with aliphatic hydrocarbons (or in some cases h...

2009
Gavan Sean McGrath, Christoph Hinz, Murugesu Sivapalan,

[1] The experimental evidence suggests that for many chemicals surface runoff and rapid preferential flow through the shallow unsaturated zone are significant pathways for transport to streams and groundwater. The signature of this is the episodic and pulsed leaching of these chemicals. The driver for this transport is the timing and magnitude of rainfall events which trigger rapid flow and the...

2003
Claude G. Matasa,

It is in the clinician's interest to select the least hazardous devices and materials among the many offered by manufacturers. The polymer chosen is important; some polymers have been reported to be hazardous, and these are quite often used in direct contact with human tissues. For protection, the clinician could test the material's extract in water according to an ISO standard, but the tests r...

Journal: :Environmental science & technology 2005
Kristin Stook, Thabet Tolaymat, Marnie Ward, Brajesh Dubey, Timothy Townsend, Helena Solo-Gabriele, Gabriel Bitton,

Size-reduced samples of southern yellow pine dimensional lumber, each treated with one of five different waterborne chemical preservatives, were leached using 18-h batch leaching tests. The wood preservatives included chromated copper arsenate (CCA), alkaline copper quaternary, copper boron azole, copper citrate, and copper dimethyldithiocarbamate. An unpreserved wood sample was tested as well....

The leaching kinetics of smithsonite ore in acetic acid solutions, an environmental friend, and natural reagent was investigated. The influence of parameters such as reaction temperature, particle size, solid-liquid ratio and acid concentration was studied in order to reveal the leaching kinetics of smithsonite ore. In this study, experimental and statistical methods were carried out in order t...

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