pper ore leaching by sulphuric acid

At hightemperature pressure leaching conditions, the formation of sulphuric acid from sulphides in the ore is favoured, however at medium and lowtemperature conditions (150–165oC and >140oC, respectively) elemental sulphur formation occurs. At these temperatures, the elemental sulphur is molten and causes issues in further leaching.

High pressure sulphuric acid leaching of lateritic nickel ore 477 leaching time on high pressure sulphuric acid leaching of a local lateritic nickel ore sample having % Ni were investigated by using chemical and Xray diffraction analyses. Other than nickel, the dissolution ratio values of cobalt, iron, magnesium,

The leaching of dolomiticcopper ore using sulphuric acid under controlled conditions was studied with a view to evaluating the economic value and the effect of ore pulverisation, particle size, temperature and pH on the recovery of copper from chalcopyrite. The samples were ground and mixed with water and sulphuric acid to form an acid soluble copper content of %, % total copper and ...

We claim: 1. In the method of solubilizing magnesia and nickel in nickeliferous serpentine ore by leaching the ore with an aqueous solution of sulphuric acid to obtain maximum extraction of nickel consistent with minimum extraction of iron and magnesia and minimum acid consumption, the improvement which comprises maintaining the pH of the solution between and, at atmospheric pressure ...

Shrinking core model with variable activation energy: a kinetic model of manganiferous ore leaching with sulphuric acid and lactose. Hydrometallurgy, 2001. F. Pagnanelli. L. Toro.

 · Acid Leaching Process Flowsheet. ... The flowsheet discussed in this study is for treatment of 100 tons per day oxidesulfide copper ore by the leaching process using sulfuric acidferric sulfate solvent. ... The source of sulphuric acid for leaching is usually a major consideration for small plants.

Heap leaching is an industrial mining process used to extract precious metals, copper, uranium, and other compounds from ore using a series of chemical reactions that absorb specific minerals and reseparate them after their division from other earth materials. Similar to in situ mining, heap leach mining differs in that it places ore on a liner, then adds the chemicals via drip systems to the ...

In International seminar on lateritic ore acid leaching technology, Cuba, Nov. 1991 Google Scholar 5. Agatzini S. and Dimaki D. (1991) Recovery of nickel and cobalt from lowgrade nickel oxide ores by heap leaching with diluted sulphuric acid at room temperature.

The kinetics of the sulfuric acid leaching of altered ilmenite, mechanisms, and process intensifiion methods were studied. The effect of changing the chemical composition during grinding was determined. The content of ilmenite and pseudorutile decreased from % to % and from % to %, respectively. Rutile increased from % to %, while a pseudobrookite new phase appeared in ...

Ferruginous manganese ore was subjected to acid reductive leaching using sucrose (C12H,40,) as reducing agent in sulphuric acid media. The effect of sucrose is more important in the intermediate level of acid concentration. The dissolution process of iron can be described by the following reactions (here the iron compound is reported as iron ...

processes using dilute sulphuric acid. The first process, vat leaching of highgrade copper oxide ore followed by EW of copper from the leach solution, produced low quality copper hode at relatively high cost. In 1968 the tonnage of highgrade oxide ores was decreasing and vat leaching was on the decline.

Uranium minerals consisting Ningyotoge ore deposits, such as Autunite, Metaautunite and Ningyoite, are dissolved by various acids and alkalies. In this paper, the writer describes about chemical leaching of ores of Ningyotoge by sulphuric acid.

We claim: 1. In the method of solubilizing magnesia and nickel in nickeliferous serpentine ore by leaching the ore with an aqueous solution of sulphuric acid to obtain maximum extraction of nickel consistent with minimum extraction of iron and magnesia and minimum acid consumption, the improvement which comprises maintaining the pH of the solution between and, at atmospheric .

 · The major steps of the process consist of (1) calcining kaolin at 750° C, (2) leaching the calcine in sulfurous acid (H2SO3), (3) separating the insoluble silica from the pregnant solution by filtration, (4) precipitating monobasic aluminum sulfite from the pregnant solution, (5) decomposing the precipitate to yield crude alumina, and (6) purifying the crude alumina by caustic digestion and ...

KINETICS AND MECHANISM OF SPHALERITE LEACHING BY SODIUM NITRATE IN SULPHURIC ACID SOLUTION M. Sokić*,#, ć *, V. Matković, D. Živković**, N. Štrbac**, J. Stojanović* *Institute for Technology of Nuclear and Other Mineral Raw Materials, Belgrade, Serbia **University of Belgrade, Technical Faculty at Bor, Bor, Serbia (Received 30 November 2011; accepted 15 January .