Limonite - Wikipedia
Limonite (/ ˈ l aɪ m ə 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.
Lateritic nickel ore deposits - Wikipedia
Lateritic nickel ore deposits are surficial, weathered rinds formed on ultramafic rocks. They account for 73% of the continental world nickel resources and will be in …
Extraction of nickel and cobalt from reduced limonitic ...
Firstly, limonitic laterite ore is roasted under reducing conditions. In the reduced ore, the main phases are iron alloys and wustite which contained nickel and cobalt. Then a selective chlorination is conducted in an air and hydrogen chloride atmosphere. The iron alloys and wustite are chlorinated by …
Recovery of nickel and cobalt as MHP from limonitic ore ...
The seed addition increases nickel and cobalt precipitations significantly to 99.9% and 99.1%, respectively. However, the addition of seed into led to a significant increase of manganese co-precipitation from 24.2% without seed addition to 39.5% at the addition of 1 g seed per 200 mL of PLS.
Nickel Mountain Mine Near Riddle, Oregon | The Diggings™
The ore mined is composed of chromite, spinel and chlorite with waste material consisting primarily of montmorillonite and chalcedony. As of 1984 there were two known tabular shaped ore bodies one of which extends 1,830 meters (6,003 feet) long, 915 meters (3,001 feet) …
Kinetika dan Mekanisme Pelindian Limonit : Pengaruh Waktu ...
The effect of temperatur and time were studied at various temperatures of 30, 50, and 90 °C with leaching time up to 480 minutes. A maximum 95% Ni extraction value was obtained for 480 min leaching at 90 °C from -150+200 mesh of limonitic nickel ore, with a concentration of H2SO4 of 1 M and a 2.5% ore …
Effects of reduction temperature to Ni and Fe content and ...
This research aims to optimized the process of nickel laterite ore extraction using coal bed method. This research was conducted by reducing low grade nickel laterite ore (limonitic) with nickel content of 1.25 %. The reduction process was carried out using CO gas which formed by …
Extraction of nickel and cobalt from nickeliferous ...
Oct 10, 2017 · The present study proposes a new smelting process for limonitic nickeliferous laterite ore in order to separate nickel and cobalt from the ore and produce a nickel matte at lower smelting temperature compared with the current industrial techniques. The nickel and cobalt recoveries were evaluated at various flux additions.
Selective leaching of nickel from prereduced limonitic ...
As nickel in limonitic laterites is mainly associated with iron oxides, such as goethite - FeOOH, the task of reductive roasting is to convert the host mineral to a lower more active form of oxide, wustite-FeO, that would be easier to dissolve than the raw ore in the traditional HPAL. This strategy is based
Thermodynamics of the Reduction Roasting of Nickeliferous ...
For the limonitic ore, a high nickel recovery of 99% can be achieved at 680˚C with a nickel grade of the ferronickel of about 14%. On the other hand, for the saprolitic ore, nickel recoveries of 92% can only be achieved at 1150˚C with a nickel grade of the ferronickel of 52%.
Extraction of Nickel and Cobalt from Sulfide Ores ...
All the nickel in nickel sulfide ores occurs in the mineral pentlandite hosted by silicate rock minerals referred to as gangue rock. The nickel sulfide is separated from the host rock by flotation.
DIRECT REDUCTION OF NICKEL LATERITE LIMONITIC ORE USING …
Raw materials of limonite nickel ore of a 50 mesh standard size were obtained from Southeast Sulawesi, Indonesia. The coal used was obtained from south Borneo, Indonesia, while the dolomite was a product of Gresik, East Java, Indonesia. The stone composi - tion of …
Limonitic - definition of limonitic by The Free Dictionary
Define limonitic. limonitic synonyms, limonitic pronunciation, limonitic translation, English dictionary definition of limonitic. n. Any of a group of widely occurring yellowish-brown to black iron oxide minerals, essentially FeO · n H2O, used as a minor ore of iron. li′mo·nit′ic adj....
v117n7a11 Laboratory-scale smelting of limonitic laterite ...
Nickel laterites are classified into three main types; saprolite, nontronite, and limonite. Of these, limonitic ores possess the lowest nickel content, ranging from 0.8 to 1.5 wt%. It is generally accepted that limonitic laterites are suitable for hydrometallurgical treatment while saprolitic laterites are suitable for
Srećko Stopi Sulphuric Acid Leaching of the Serbian Nickel ...
Srećko Stopić et al.: Sulphuric Acid Leaching of the Serbian Nickel Lateritic Ore Laterites are oxide ores widely distributed in the equatori-al regions. Lateritic deposits usually consist of three layers, namely the limonitic, the saprolitic and garnieritic layer. It is known that 54 …
PAPER OPEN ACCESS Effect of concentration, agitation, and ...
The limonite nickel ore is a type of laterite with characteristics having a low nickel and magnesium content (Ni <1.5% and Mg <2%), but high iron content (Fe> 50%) [1] therefore the limonite nickel is not suitable to be processed through pyrometallurgy. It could be said that, hydrometallurgy is the suitable process for limonite nickel ore.
Kinetic study on leaching of nickel from Turkish lateritic ...
Jan 12, 2016 · Dissolution kinetics of nickel from lateritic ore in nitric acid solution was investigated. Experimental parameters used were stirring speed (100-600 r/min), temperature (40-96 °C), nitric acid concentration (0.1-2 mol/L) and particle size (<106 µm). The shrinking core model was applied to the results of experiments investigating the effects of leaching temperature in the range of 40-90 °C ...
Limonitic synonyms, limonitic antonyms - FreeThesaurus.com
The limonitic Cawse ore is comprised of two components - hard coarse grains and lumps of barren silica, and a fine fraction of limonitic clays containing up to 2% Ni.