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Abstract. Bioleaching is a simple and effective technology for metal extraction from low grade ores and mineral concentrates. Metal recovery from sulfide minerals is based on the activity of chemolithotrophic bacteria, mainly Thiobacillus ferrooxidans and T. thiooxidans, which convert insoluble metal sulfides into soluble metal sulfates.
Caustic leaching of the ilmenite concentrates resulted in the removal of silicon, as well as of aluminum, without affecting the contents of titanium and iron. Leaching temperature and the retention time were proved as crucial parameters for the effective dissolution of silicon.
A ferrous chloride oxygen leaching system was investigated by the federal Bureau of Mines as a means of recovering copper and silver from a sulfide concentrate that had been pretreated to remove a majority of the antimony. The pretreated concentrate contained cu, ag, pb, zn, sb and as.
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1. oxalic acid complexes iron, which is why it is a much better remover of iron stains than you would expect from the strength of the acid alone (although it is still a strong acid compared to most other organics). The ability to make iron unavailable to your body would indeed damge your blood if ingested, but the acidity is a bigger worry.
A hydrometallurgical method for the removal of phosphorus from iron ore is presented. The apatite content ( 1%) of a Swedish ore is removed (gt; 95%) by leaching the ore with nitric acid. The iron loss is less than 0.05% while the alkali metal content is greatly reduced (gt; 60%).
stage, leaching temperature of 95oC, and 2.0 moles per liter of ferric chloride. The copper dissolution is 95%. Chemical analyses of the leaching residue indicate the residue contains 52% sulfur, 5% iron, 2.5% copper and 31% SR, where SR indicates the solid leaching residue of aqua regia digestion.
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The ores, having been broken and ground, generally in tube mills, until they pass a 150 to 200 mesh sieve, are transferred to the leaching vats, which are constructed of wood, iron or masonry; steel vats, coated inside and out with pitch, of circular section and holding up to woo tons, have come into use.
Leaching is the process of washing away nutrients and other dissolvable substances from soil by adding large amounts of water to the soil. The factors that influence leaching are temperature, the setting, and the solvent. Temperature influences leaching because it allows for materials to dissolve at different rates.
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hydrogen phosphate and TSP. Leaching by ordinary ground water was also investigated on the arsenic saturated iron oxide impregnated brick sands from filters. A 10% caustic soda solution could leach ~95% arsenic, 20% sodium chloride solution could leach ~17.28%, 10% sodium carbonate solution 11.34%, 10% potassium dihydrogen phosphate
concentrate pelletizing process, and effect on steel quality. The current study was focused on the removal of sulfur from iron ore concentrate using chemical leaching technique. Magnetite iron ore concentrate was chosen for this purpose. The results obtained from the
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Sulphide concentrate leaching upon similar lines to those of any ordinary ore and the method is worked out by a series of comparative tests in the ordinary way. In general it may be said that concentrates if they are to be treated raw need exceptionally fine grinding in order to yield a high recovery by cyanide; a long period of contact
2 October 25th, 2004 Presentation Outline Safety share Introduction Global copper reserves/resources Phelps Dodge production reserves profile Commercial drivers for copper concentrate leaching The copper concentrate market and TC/RCs Phelps Dodge copper pressure leaching developments High temperature Medium temperature Critical success factors for commercialization
solution. This solution is further pumped to the iron removal and solvent extraction stages. The solid residue from the leaching is cake containing precious metals, which can be further treated as a precious metal product. Nickel matte and concentrate chloride leaching Chloride leaching is an alternative way to treat nickel raw materials.
Quantitative Leaching of a Nigerian Iron Ore Alafara, A. Baba; Adekola, F A; Folashade, A O 17 RESULTS AND DISCUSSION Elemental Analysis of the iron ore by ICP MS The results of the elemental analysis are presented in Table 2. Table 2 aElemental composition of the iron ore. Fe Mn Ca Mg Na K Ti Al Si P O*
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Xia studied the removal of phosphorus from high phosphorus iron ores by selective HCl leaching method and found that, under proper conditions, the removal rate of phosphorus could exceed 98% .
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concentration of iron(II) of 0.02 mg/L. Therefore, the results obtained in this work allow to conclude that cementation may be used to purify the solution obtained in the sulphate leaching of a zinc sulphide concentrate after indium, iron and copper recovery by liquid
The removal of the iron appeared to offer the more attractive field. Briefly, the method followed involves leaching with sulphuric acid, removing a portion of the iron from the solution, and precipitating the copper electrolytically, Regarding the leaching per se, I do not think I could say anything which would be of any particular interest.
A first stream of ground concentrate is directed to a leach circuit wherein it is leached in a leach solution containing at least 100 gpl sulfuric acid and about 10 30 gp1 ferric iron. The leach circuit produces a pregnant solution containing about 40 75 gpl dissolved copper, less than 5 gp1 ferric iron, and at least 100 g.pl sulfuric acid.
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Process solution generated from the Mesaba concentrate confirmed a conceptual nickel flow sheet for Mesaba, which consisted of the following unit operations Iron and Aluminum Removal, Sulphide Precipitation, Mixed Hydroxide Precipitation (with magnesia), Nickel