Kinetics of leaching laterite

Olanipekun, E. O.

doi:10.1016/s0301-7516(99)00067-8

Cited by 74 publications

(32 citation statements)

References 1 publication

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“…Alternate wet (rainy) and dry seasons favours the formation of lateritic soils, as leaching of the parent rock takes place in the rainy season while during the dry season, capillary action transports solutions of leached ions to the surface from where it evaporates with the salts left behind to be washed down the following wet season. Thus the whole zone is progressively depleted of the more mobile elements like Na, K, Ca etc.. Olanipekun, (2000) observed that the high proportion of Fe 3+ oxides in laterites signifies a left-over accumulation as a result of removal of silica and alkalis. The process of laterisation around south-western Nigeria was observed by Emofurieta, & Salami, (1993) while studying the geochemical dispersion patterns associated with the laterisation process at Ile-Ife.…”

Section: Lateritic Soilsmentioning

confidence: 97%

A review of the use of lateritic soils in the construction/development of sustainable housing in Africa: A geological perspective

Oyelami

Rooy

2016

Journal of African Earth Sciences

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Highlights• Appraisal of the previous work in the use of tropical soils in low cost, energy efficient housing development.• It established CEBs as sustainable building materials for a sustainable environment.• Identification of lateritic soils as suitable material in the production of CEBs.• Established the importance of parent rock material (its type and mineralogy) in strength and durability of CEBs.• Discouraging the common practice of firing clay bricks for the sake of sustainable environment. AbstractLateritic soils have been described as highly weathered tropical or sub-tropical residual soils with varying proportions of particle sizes ranging from clay size to gravel, usually coated with sesquioxide rich concretions. It is sometimes referred to as brick earth based on its use. The use of laterite and lateritic soils have been found to promote the realization of decent housing and bridging the housing deficit, especially in Africa.The author has attempted to review available information on the recent trends in building bricks and housing development with the aim of identifying a suitable soil material that will meet the present challenge of sustaining the environment without costing too much and maintaining a high standard of strength, durability and aesthetics. A critical review of laterite and lateritic soils from a geological point of view indicated these soils to be one of the best natural materials used in the production of compressed earth bricks. Lateritic soils are mostly well graded, comprising both cohesive (silt and clay) and cohesionless (sands and gravels) soil fraction, it contains sesquioxides and clay minerals which are very useful in the natural binding process as well as in the presence of most chemical binders.Compressed earth bricks are mainly composed of raw earth materials (soil) with their cohesion due principally to the clay fraction present in both humid and dry states. CEB's promote building in a 'sustainable' way and offers a good prospect to using our resources in an efficient manner while creating dwellings that improve human health, well-being and preserving a better environment, with an affordable and natural alternative.

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Section: Lateritic Soilsmentioning

confidence: 97%

A review of the use of lateritic soils in the construction/development of sustainable housing in Africa: A geological perspective

Oyelami

Rooy

2016

Journal of African Earth Sciences

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“…Hal ini mengindikasikan bahwa bijih nikel laterit dari Halmahera cenderung lebih mudah dilarutkan dibandingkan bijih yang digunakan peneliti-peneliti tersebut yang berasal dari Turki dan Nigeria. Tingginya harga energi aktivasi pelindian bijih nikel laterit dikontribusi oleh keberadaan mineral yang belum dan tidak bereaksi pada proses pelindian bijih limonit seperti silika dan hematite dan senyawa silikat seperti antigorite yang cenderung bersifat refraktori (sulit larut sempurna dalam larutan asam) [9,10] . Hasil XRD terhadap residu pelindian menunjukkan bahwa komponen utama residu adalah silika, hematite, antigorite, dan pyrochroite seperti ditunjukkan pada Gambar 9.…”

Section: B Penentuan Energi Aktivasi Pelindianunclassified

Studi Kinetika Pelindian Bijih Nikel Limonit Dari Pulau Halmahera Dalam Larutan Asam Nitrat [Kinetics Study of Nickel Limonite Ore Leaching from Halmahera Island in Nitric Acid Solution]

Mubarok¹,

Fathoni²

2016

metal.

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IntisariSalah satu perkembangan terkini proses ekstraksi nikel dari bijih laterit dengan jalur hidrometalurgi adalah dengan menggunakan reagen pelindi yang dapat diregenerasi, seperti asam klorida dan asam nitrat. Meskipun keberhasilan proses pelindian bijih nikel laterit dalam asam nitrat telah dilaporkan, studi kinetika pelindian bijih nikel laterit dalam asam nitrat sedikit dipublikasikan. Dalam paper ini dipresentasikan hasil analisis kinetika pelindian bijih nikel laterit tipe limonit dari Pulau Halmahera dalam larutan asam nitrat pada tekanan atmosfer. Studi kinetika pelindian bertujuan untuk mengetahui pengendali laju reaksi, parameter kinetika (konstanta laju reaksi atau koefisien difusi), energi aktivasi reaksi dan persamaan kinetikanya. Kinetika pelindian dipelajari dengan menggunakan model shrinking core (SCM). Hasil analisis menunjukkan bahwa pengendali laju reaksi pada pelindian bijih limonit dari Pulau Halmahera dalam larutan asam nitrat adalah difusi melalui lapisan produk padat dengan koefisien difusi efektif (D e ) sebesar 2,1-8,55 x 10 -10 m 2 /s pada rentang suhu 65-95 °C serta energi aktivasi sebesar 46,78 kJ/mol.

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“…While used as a resource for nickel, laterite itself contain mainly the oxide of iron, aluminum or both with nickel, cobalt and chromium as minor compound [3]. Leaching method of laterite ore is very dependent of its content.…”

Section: Introductionmentioning

confidence: 99%

Effect of pulp density and particle size on indirect bioleaching of Pomalaa nickel laterite using metabolic citric acid

Petrus

Wanta

Setiawan

et al. 2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Nickel laterite ore contains oxide of iron, aluminum or both with nickel, cobalt and chromium which can be leached out using hydrometallurgical process. For the purpose of meeting the world's increasing demand of nickel, there is a need to invent environmentally friendly process to efficiently leach nickel. This experiment used nickel laterite ore obtained from Pomalaa, South Sulawesi. The leaching agent is metabolic citric acid produced by Aspergillus niger under optimum condition. Leaching process was done in three-necked flask in atmospheric temperature and constant stirring speed of 200 rpm. The variable examined in the experiment was pulp density and particle size of nickel laterite ore. Samples were taken at 3, 7, 10, 14, and 17 minutes and then filtered and diluted to be analyzed using ICP-AES. The result of the experiment showed the maximum recovery of metals increase with the decrease of the pulp density. The maximum recovery for varying pulp density were at 5% solid/liquid ratio and the recovery were Ni at 1.63%, Al at 0.47%, Fe at 0.23% and Mg at 1.09%. The effect of particle size on leaching process showed that the leaching process follows the shrinking core model. The maximum recovery of metals at particle size were at 100-120 mesh with Ni at 1.37%, Fe at 0.10%, Al at 0.72% and Mg at 0.62%.

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Kinetics of leaching laterite

Cited by 74 publications

References 1 publication

A review of the use of lateritic soils in the construction/development of sustainable housing in Africa: A geological perspective

A review of the use of lateritic soils in the construction/development of sustainable housing in Africa: A geological perspective

Studi Kinetika Pelindian Bijih Nikel Limonit Dari Pulau Halmahera Dalam Larutan Asam Nitrat [Kinetics Study of Nickel Limonite Ore Leaching from Halmahera Island in Nitric Acid Solution]

Effect of pulp density and particle size on indirect bioleaching of Pomalaa nickel laterite using metabolic citric acid

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