Top information

Nickel processing

Various processes are used to treat nickel matte One process is the ammonia pressure leach, in which nickel is recovered from solution using hydrogen reduction, and the sulfur is recovered as ammonium sulfate for use as fertilizerIn another, the matte may be roasted to produce high-grade nickel oxides; these are subjected to a pressure leach, and the solution is electro- and carbonyl refined...

NICKEL MATTE CHLORIDE LEACHING

ammonia The water balance is controlled by evapora-tion after the ammonia regeneration Calcium chloride is regenerated into hydrochloric acid and the solution is returned to leaching In total, the leaching process takes about 10 to 15 hours to complete The leaching residue weight is about 25 percent of that of the matte fed into the process...

Nitrogen Losses From Urea

May 01, 2009· Nitrogen Losses From Urea By Eddie Funderburg, EdD Senior Soils and Crops Consultant , the ammonia gas will quickly combine with soil water to form ammonium hydroxide which is stable and not subject to volatilization loss However, if the urea is on the soil surface when the breakdown occurs, the ammonia gas is lost to the atmosphere ....

[PDF] Atmospheric acid leaching of nickel

The leaching behaviour of nickeli?½copper matte in an acidici?½copper sulphate solution during the repulping stage at Impala Platinum Refineries has been studied The base metal recovery process consists of a matte repulping stage prior to a series of pressure leach stag Therefore, the repulping stage is basically an atmospheric leach stage in which the matte containing mostly Ni and Cu ....

Cobalt extraction

The residue is removed A feed of matte and sulfide concentrate containing approximately 04% cobalt and 30% sulfur is pressure leached at elevated temperature and pressure in an ammoniacal solution to produce a solution of nickel, copper and cobalt By boiling away the ammonia; copper is precipitated as a sulfide and sent to a smelter...

On the Operability of the Sherritt

On the Operability of the Sherritt-Gordon Ammonia Leach at the Kwinana Nickel Refinery Travis M Woodward BE (Hons) School of Engineering and Information Technology Murdoch University Murdoch, Western Australia, Australia This thesis is presented for the ,...

(PDF) Leaching of Iron

Leaching of Iron-Containing Copper-Nickel Matte at Atmospheric Pressure , influenced by the concentration of ammonia, leaching time, leaching temperature, and pH , for the atmospheric ....

Atmosphere of Earth

The atmosphere of Earth is the layer of gases, commonly known as air, that surrounds the planet Earth and is retained by Earth's gravityThe atmosphere of Earth protects life on Earth by creating pressure allowing for liquid water to exist on the Earth's surface, absorbing ultraviolet solar radiation, warming the surface through heat retention (greenhouse effect), and reducing temperature ....

Atmospheric oxidative and non

Atmospheric oxidative and non-oxidative leaching of Ni-Cu matte the leaching behaviour of typical South African PGM-containing Ni-Cu mattes in chloride media is worth investi-gating This study investigated the atmospheric leaching of PGM-containing Ni-Cu matte by acidic ferric chloride solution The aim of this project was to achieve maximum ....

Selective leaching of a high

The objective of this paper is to conduct a feasibility study of selective recovery of Co, Ni and Cu from a low grade matte with a high-iron content using sulfuric acid leaching at atmospheric pressure An innovative process is proposed to directly leach the high-iron cobalt matte at atmospheric ,...

Parametric Effects on Leaching Behavior of Nickel

ture, leaching time, ammonia concentration, and pH) on the leaching behavior of Ni-Cu matte were investigated The temperature range studied was between 50 Cand70C, ammonia concentration was varied from 15, 20, 25, to 30M, while the leaching time ranged from 0 to 300min The stirring speed was kept constant at 410rpm, while the...

Ammonia/nitric Acid Leaching of Copper

reported that, copper from Cu matte can Ni-easily been leached by using ammonia at atmospheric condition Ammonia leaching is also selective in that it will not dissolve all available nonspecific metals, such as iron and manganese, along with the copper or cobalt, as sulphuric acid do More Ammonia leaching can be used in non-oxidative....

No.416 Jianye Road, South Jinqiao Area,Pudong New Area, Shanghai, China.

Telephone : +86-21-58386189, 58386176

FAX : +86-21-58385681