leaching


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Related to leaching: Heap leaching
  • noun

Synonyms for leaching

the process of leaching

References in periodicals archive ?
Recent test work has further optimized the organic acid leaching process, which has achieved nickel extraction of up to 98% from the saprolite material after less than 30 minutes.
The results of leaching 28 large diameter columns run on intrusive copper mineralization have shown higher copper recovery and shorter leaching time than had been expected.
A relative assessment of leachability can be determined from laboratory leaching experiments (Zhang and Kamdem 1999).
It has never been shown that lead is actually leaching out of landfills," says Fern Abrams, director of environmental policy at IPC-Association Connecting Electronics Industries, an industry group based in Northbrook, Illinois.
Water draining off each board was separately analyzed for CCA leaching.
Hydrometallurgy, particularly pressure leaching, is the use of water with pressure and high temperature to more efficiently extract minerals from an ore body.
After 60 days of leaching interim gold recoveries have ranged from 70% to 89% for the different deposits, provisionally calculated from head assays.
Silver recovery rate data from the bottle rolls conducted on the Tejamen cuttings samples show that silver extraction was progressing at a slow, but significant rate, when leaching was terminated after 4 days of leaching.
The efficacy of chromated copper arsenate (CCA) requires a balance between having the components soluble enough to be effective against target organisms throughout a product's service life, but also having low enough solubility to resist leaching (Lebow 1996, Hingston et al.
Townsend concludes that for steel-laden electronics, a direct measurement of lead content may be more reliable than the standard leaching test for determining whether the products, when thrown away, should be designated as hazardous waste.
Other projects have shown that hexavalent chromium leaches from CCA-treated wood, including a 1990 study by scientists from the University of Guelph in Ontario, published in volume 9 of Environmental Toxicology and Chemistry, that showed that leaching of chromium increased as the pH of a deck-washing solution was lowered.
Effective September 25, 1990, the Toxicity Characteristic Leaching Procedure (TCLP) replaced the EP-Toxicity Test as EPA's primary evaluation method for determining a material's toxicity.
Test work has shown that, depending on the acid balance across the autoclaves, it is possible to manipulate the extent to which the iron sulphates produced from leaching chalcopyrite and pyrite in the autoclave can be hydrolysed to a mix of haematite and basic ferric sulphate.
While lead leaching from crushed glass of black-and-white TV tubes and monitors never reached that limit, lead from all 30 color units exceeded that concentration, Townsend and his colleagues report in the Oct.
The researchers developed a leaching procedure in which wastes were placed in a flask and the flask was filled with distilled water.