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The DNi process uses nitric acid, instead of sulphuric acid, to extract the nickel within a few hours and then the nitric acid is recycled. The DNi process has the major advantage of being able to treat both limonite and saprolite lateritic ores and is estimated to have less than half the capital and operating costs of HPAL or Ferronickel ...
Limonite (/ ˈ l aɪ m ə ˌ n aɪ t /) is an iron ore consisting of a mixture of hydrated iron(III) oxide-hydroxides in varying composition. The generic formula is frequently written as FeO(OH)· n H 2 O , although this is not entirely accurate as the ratio of oxide to hydroxide can vary quite widely.
Saprolite is a chemically weathered rock. Saprolites form in the lower zones of soil profiles and represent deep weathering of the bedrock surface. In most outcrops , its color comes from ferric compounds.
Soil layers, from soil down to bedrock: A represents soil; B represents laterite, a regolith; C represents saprolite, a less-weathered regolith; below C is bedrock Tropical weathering (laterization) is a prolonged process of chemical weathering which produces a wide variety in the thickness, grade, chemistry and ore mineralogy of the resulting ...
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Formerly Cagdianao operated the South Dingagat Mine, which was closed in October 2007 due to substantial depletion of the higher grade saprolite ore reserves. It has since reopened since 2021. They also operated the Manicani Mine, Manicani Island, Guiuan, Eastern Samar, from 1992 to 1994, and briefly again in 2001, [7] and 2014 to 2016. [8]
Today's NYT Connections puzzle for Saturday, February 15, 2025The New York Times
Five people were hit with murder charges for allegedly torturing and killing transgender man Sam Nordquist in upstate New York, authorities said.