The history of pre-Columbian metallurgy in South America is incomplete because looting of metal artifacts has been pervasive. Here, we reconstruct a millennium of metallurgical activity in southern Bolivia using the stratigraphy of metals associated with smelting (Pb, Sb, Bi, Ag, Sn) from lake sediments deposited near the major silver deposit of Cerro Rico de Potosí. Pronounced metal enrichment...

There is a growing public concern over the potential accumulation of heavy metals in soil, owing to rapid industrial development. In an effort to describe the status of the pollutions of soil by industrial activities, relevant data sets reported by many studies were surveyed and reviewed. The results of our analysis indicate that soils were polluted most significantly by metals such as lead, zi...

This analysis focuses on cadmium flows and atmospheric emissions in the life cycle of cadmium telluride solar cells. New data in the mining/smelting and utilization phases were used. Published estimates were cross-referenced with current environmental impact reports from metal smelting facilities, and experimental investigations were conducted to quantify emissions during fires. It was estimate...

1. Using male rats, the availability of fluoride from five by products of the aluminium smelting industry was tested. This was done by considering the balance between fluoride administered in controlled diets and the total fluoride content of waste products eliminated over an experimental period of 1 week. 2. Results indicated that yields of available fluoride expressed as percentage weight of ...

Biomining is the extraction of specific metals from their ores through biological means usually bacteria. Although it is a new technique used by the mining industry to extract minerals such as copper, uranium and gold from their ores but nowadays biomining occupies an increasingly important place among the available mining technologies. Today biomining is no longer a promising technology but an...

The end-point control technology of basic oxygen furnace (BOF) steelmaking is a very important production process in the later stage smelting, and it has become research hotspot smelting industry. In this paper, carbon content temperature prediction models were established based on twin support vector regression (TSVR). order to ensure stability model, input variables model determined by using ...

The non-ferrous metal industry is one of the most important parts China’s process and has an extremely strategic position in national economy. However, there are many problems smelting: (1) utilization rate resource energy low production process. (2) Large amount waste emissions have caused prominent environmental problems. (3) added value metals low; besides, product homogenization serious. To...

In March 2014, a man, aged 59 years, who lived alone and had been using different smelting techniques viewed on the Internet to recover gold and silver from computer components, was evaluated at a local emergency department for shortness of breath, tremors, anorexia, and generalized weakness. During the smelting processes, he had used hydrogen peroxide, nitric acid, muriatic acid, and sulfuric ...

during the course of our studies on archaeometallurgy in southeastern iran, we tried to survey the triangle of the sirdjān, neiriz and shahr- e- bābak. as a result, remains of old iron mining residues of smelting furnaces, and iron smelting slag heaps were observed and recorded. a few samples of iron ore and smelting slag have been analysed classically and instrumentally. according to the acq...