This study provides an up to date review of tannins, specifically quebracho, in mineral processing and metallurgical processes. Quebracho is a highly useful reagent in many flotation applications, acting as both a depressant and a dispersant. Three different types of quebracho are mentioned in this study; quebracho “S” or Tupasol ATO, quebracho “O” or Tupafin ATO, and quebracho “A” or Silvafloc...

The uncontrolled release of acid mine drainage (AMD) characterized by elevated concentrations of dissolved metals, high levels of sulfate ions and low pH values threatens the quality of water resources nearby mining areas worldwide. The development of novel technologies based on the precipitation of metals as metal sulfides catalyzed by sulfate reducing bacteria constitute an important method f...

Nitrate addition stimulated sulfide oxidation by increasing the activity of nitrate-reducing sulfide-oxidizing bacteria (NR-SOB), decreasing the concentration of dissolved H2S in the water phase and, consequently, its release to the atmosphere of a pilot-scale anaerobic bioreactor. The effect of four different concentrations of nitrate (0.12, 0.24, 0.50, and 1.00 mM) was investigated for a peri...

Copper slag flotation was studied on an industrial scale at a concentrator plant in the region of Atacama, Chile. This study consisted physical, chemical, and mineralogical characterization copper slag, along with preliminary tests. article focuses flotation, which two oneyear campaigns (2016 2017). The first campaign carried out using existing circuit plant. During second (2017), for sulfide o...

Magnesium hydroxide (Mg(OH)2) is commonly dosed in sewer systems to control corrosion and odour problems by preventing sulfide transfer from the liquid to the gas phase. Current dosing practices do not take the dynamics of sewage flow and sulfide production into consideration. This paper presents the development of an on-line control methodology for the optimised dosing of Mg(OH)2, based on pH ...

Food industry uses large amounts of water for various purposes, including refrigeration and cleanliness, as raw material, as sterile water for food, transportation, cooking and dissolution auxiliary water etc. In principle the water used in the food industry can be recycled as process water and cooling or boiler feed water. As a consequence of diverse consumption, quantity and composition of wa...

Present methods for the determination of sulfide in wastewater are hindered by poor detection limits and extensive sample pretreatment. A less problematic method has been developed with a method detection limit of 2.5 μg L-1. With this technique, sparged hydrogen sulfide is precipitated in an acetate-supporting electrolyte by electrogenerated silver ions. Analysis of basepreserved samples was p...

Bioremediation strategies that depend on bacterial sulfate reduction for heavy metals remediation harness the reactivity of these metals with biogenic aqueous sulfide. Quantitative knowledge of the degree to which specific toxic metals are partitioned into various sulfide, oxide, or other phases is important for predicting the long-term mobility of these metals under environmental conditions. H...

Most tanneries use conventional systems for treatment of the mixture of all production effluents. Such an approach makes it possible to meet environmental regulations, but because of the high cost of the treatment facilities, its implementation has been scarce, especially in developing countries. With the waste reduction-elimination concept in view, an alternative strategy for water management ...