In present investigation the biological leaching of aluminum by isolated fungi from red mud, the main waste product of the alkaline extraction of Al from bauxite was studied. Biological leaching experiments were carried out using indigenous, date and orange specimen fungi, Aspergillus Niger, Penicillium simplicissimum notatum. Savored Dextrose chloramphenicol Agar (SDA) wa...

Aiming at the industrial scale development of a Scandium (Sc)-selective leaching process 14 of Bauxite Residue (BR), a sufficiently numerous set of process design aspects has been 15 investigated, by appropriate exploitation of available experimental data. The interpretation of 16 experimental data for Sc leaching yield, with sulfuric acid as the leaching solvent, has shown 17 significant impac...

Recovery of platinum from spent catalysts can meet the comprehensive recycling secondary resources. and enrichment Al2O3 carrier catalyst using matte smelting for pyrite-acid leaching process were studied. In melting process, effects pyrite, CaO, quartz sand, Na2B4O7 dosage on recovery rate Pt investigated. effect H2SO4 concentration, temperature, time, liquid/solid (L/S) ratio enriching effici...

this study investigates the optimization of gold dissolution from aghdarre ore. therefore, a laboratory investigation was initiated, to improve the leaching conditions with the objective of maximizing mill capacity with no reduction on gold recovery. it was observed that the time reduction from 25 to 15 hours did not change the gold recovery. in the other words, it indicated that a capacity of ...

Leaching of nitrogen from arable land can lead to pollution groundwater and surface water. Various measures have been implemented in agriculture reduce leaching, but there is still potential do more. To find the best agricultural management regime limit problem, leaching soils under different must be measured. Different methods estimate are available, they not thoroughly evaluated. This study c...

The continuous evolvement of dairy industry in countries like New Zealand, with increased dairy conversions and intensification, has resulted in remarkable economic development, though at the cost of environmental degradation. The increasing use of nitrogen fertilizers to sustain increasing number of cows has increased the risk of enhanced nitrate leaching and methane and nitrous oxide emission...

This study investigates the optimization of gold dissolution from Aghdarre ore. Therefore, a laboratory investigation was initiated, to improve the leaching conditions with the objective of maximizing mill capacity with no reduction on gold recovery. It was observed that the time reduction from 25 to 15 hours did not change the gold recovery. In the other words, it indicated that a capacity of ...

In this paper, the composite additive of CaF2/CaO was used to extract vanadium from stone coal, and the effect of roasting and leaching kinetics were studied. The purpose of this manuscript is to realize and improve the vanadium recovery from stone coal using the composite additive. The experimental results indicated that the roasted clinker can be obtained under the conditions of CaF2/CaO at a...

In this study various leaching technologies were applied to extract heavy metals from sludge from the printed circuit board process. These methods included traditional acid extraction (TAE) and microwave assisted treatment (MAT). The target heavy metal was copper. Experiments were performed to determine the acid the leaching efficiency by changing operating conditions, including acid type and c...