Results 231 to 240 of about 46,436 (267)

Uranium leaching using citric acid and oxalic acid

Journal of Radioanalytical and Nuclear Chemistry, 2019
Citric acid and oxalic acid, the main metabolites of fungi, have different leaching effects on uranium ore. Herein, uranium leaching from a volcano-litho-type uranium ore using citric acid and oxalic acid was studied by performing soaking experiments in incubator shakers using pure water and H2SO4 as controls.
Lingling Xu, Hongying Yang, Yajie Liu, Yipeng Zhou   +3 more
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Leaching kinetics of scheelite with nitric acid and phosphoric acid

International Journal of Refractory Metals and Hard Materials, 2015
Abstract The extraction of tungsten from scheelite concentrate using phosphoric acid as chelating agent in nitric acid solutions was investigated. The effects of the leaching parameters, such as stirring speed, temperature, concentrations of HNO 3 and H 3 PO 4 as well as particle size were examined in order to model the kinetics of scheelite ...
Wenjuan Zhang, Jiangtao Li, Zhongwei Zhao   +2 more
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Acid Leach Of Uranium Ore: In Situ Conditions

SPE Annual Technical Conference and Exhibition, 1979
Abstract Core samples from a property in Wyoming were tested for amenability to in situ leaching by acid ferric sulfate. In tests, about 95% recovery of the uranium was achieved. The ore is fortunately low in carbonate, and sulfuric acid consumption of 15#/T is expected using feed solutions of pH 1.8.
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Leaching Kinetics of Calcined Magnesite in Citric Acid Solutions

Industrial & Engineering Chemistry Research, 2006
The kinetics of leaching of calcined magnesite by citric acid solution was studied. The effects of reaction temperature, particle size, and acid concentration were investigated. The leaching data showed that the reaction is under chemical kinetics control with an activation energy of 39.1 kJ mol-1. Additionally, the fact that leaching was controlled by
LAÇİN, Ömer, DEMİR, Fatih, DÖNMEZ, Bünyamin   +2 more
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Extraction of alumina from coal fly ash using an acid leach-sinter-acid leach technique

Hydrometallurgy, 2015
Abstract In this paper, a two-step acid leach process for the extraction of aluminium from coal fly ash has been conducted using an acid leach-sinter-acid leach technique. The technique was formulated based on the dissimilar response characteristics of the amorphous and mullite alumina phases present in coal fly ash.
A. Shemi, S. Ndlovu, V. Sibanda, L.D. van Dyk   +3 more
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Leaching of goethite in acid solutions

2011
The leaching of goethite in solutions of perchloric, sulphuric, and hydrochloric acids and in perchloric acid in presence of sulphur dioxide has been investigated. Suspensions of goethite powder (-65, +150 mesh) were leached over a wide range of temperatures, acid concentrations and sulphur dioxide pressures.
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Investigation on leaching of malachite by citric acid

International Journal of Minerals, Metallurgy, and Materials, 2012
Leaching of an oxidized copper ore containing malachite, as a new approach, was investigated by an organic reagent, citric acid. Sulfuric acid is the most common reagent in the leaching of oxide copper ores, but it has several side effects such as severe adverse impact on the environment.
M. A. Shabani, M. Irannajad, A. R. Azadmehr   +2 more
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Leaching of Magnesite and Dolomite by Hydrochloric Acid

The primary objective of this thesis was to determine the optimum process parameters for the leaching of magnesium carbonate. The ore used for the experiments was a cryptocrystalline magnesite ore from a 516 million tonne magnesite resource located North West of Leigh Creek in South Australia.
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Acid leaching of phlogopite

International Geology Review, 1979
V. K. Bulafov, B. P. Gradusov, A. V. Zotov   +2 more
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Modeling the effects of acid leaching on concrete

Proceedings of the international conference on Applied programming languages - APL '95, 1995
This paper describes a partial differential equation model used to determine the service life of buried concrete vaults exposed to acidic ground water. A graphics package helped immeasurably in debugging and testing the algorithm. The collocation program developed in APL can easily be applied to solve other problems.
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