— Typical copper electrolyte solution produced from leaching of copper ore, contains 25–60 g/L of copper and 0.1–10 g/L of iron in the electrowinning stage (Evans, 2003; Habashi, 1998). These industrial processes operate in temperatures of 40–60 °C, pH of 1 and current densities in the range of 20–45 mA/cm 2 are used ( Moats and Free ...

In this study, weak acid in the curing and leaching stages of copper ore was incorporated, and we analyzed its effect on the dissolution of copper and final impurities. The weak acid corresponds to a wastewater effluent from sulfuric acid plants produced in the gas treatment of copper smelting processes. This effluent is basically water with high acidity (pH-value …

 — In many peat land areas in The Netherlands target concentrations for nitrogen (N) and phosphorus (P) in surface water are exceeded. A considerable, but poorly quantified, fraction, of the N and P loading of surface water in these areas originate from the subsoil. Waterboards, responsible for the water management, are currently exploring …

 — The object studied is Shaimerden oxidized zinc ore deposit containing zinc, lead, copper, iron, calcium, magnesium, aluminum, manganese and silicon. Chemical and mineralogical composition of the ore are investigated. It is established that ore coarse fraction contains more zinc carbonate and less zinc silicate compared with undersize …

During the reductive roasting of laterite ore with sodium sulfate as additive, sodium magnesium silicate and troilite are generated, this leads to high consumption of alkali and in turn environmental pollution of an alkali-rich tailing. Aiming to achieve the sustainable metallurgy by this route, oxygen pressure nitric acid leaching of laterite ore tailing was …

Aluminum oxide in peat clay has the potential to be used as a catalyst, coagulant, and adsorbent for the water treatment process. The usefulness of aluminum oxide in peat clay is enhanced by the leaching process. Aluminum was leached from peat clay in a variety of microwave power, HCl concentrations, and particle size. The effect of the microwave …

 — The flowsheet discussed in this study is for treatment of 100 tons per day oxide-sulfide copper ore by the leaching process using sulfuric acid-ferric sulfate solvent. This flowsheet would also be suitable for a larger tonnage by proper sizing of the various units of equipment. The flowsheet contemplates a six to seven day leach-wash cycle …

 — In another study by Pagnanelli et al. (2004b), the complete leaching of manganese in ore was achieved with MnO 2 ore containing 27–38% Mn using the optimized experimental conditions of 30 g ore in 100 mL solution containing a 30% stoichiometric excess of acid and glucose at 70 °C and 6 h stirring. The purification of the leach liquor ...

DOI: 10.1016/0883-2927(88)90095-9 Corpus ID: 95147844; The association of uranium with organic matter in Holocene peat: An experimental leaching study @article{Zielinski1988TheAO, title={The association of uranium with organic matter in Holocene peat: An experimental leaching study}, author={Robert A. Zielinski and Allen L. …

 — Low-grade ores are treated by dump leaching, while vat leaching can be used to treat higher grade oxide ore. Agitation leaching in stirred tanks is applied to both oxide and sulfide materials: the ...

 — To solve the problem of treating and leaching a clay ore in which the gold was finely disseminated, the author was able to suggest a unique method which he had seen described twenty-five years …

 — Hence, the well-recognized long-term climate cooling effect of global peatlands 24 comes at a relatively low N cost. Here, we begin by revisiting data on …

The uranium sorption by anion exchange resins from productive solutions prepared by carbonate leaching from peat ore was investigated. The uranium recovery from leach liquors decreased during long-time exploitation of ion exchangers due to contamination of resins with humic substances. The alkaline solution of sodium chloride can be used to …

 — Head grade - The average grade of ore fed into a mill. Heap leaching - A process where valuable metals, usually gold and silver, are extracted from a heap of crushed ore by leaching solutions. Hedging - A financial strategy involving taking an opposite position in the futures market to minimize risk from price changes.

 — Abstract. Increased metal mining in the Arctic region has caused elevated loads of arsenic (As), antimony (Sb), nickel (Ni), and sulfate (SO 42−) to recipient …

 — The uranium sorption by anion exchange resins from productive solutions prepared by carbonate leaching from peat ore was investigated. The uranium recovery from leach liquors decreased during long-time exploitation of ion exchangers due to contamination of resins with humic substances. The alkaline solution of sodium chloride …

 — The off-site effects of agricultural organic soils include the leaching of N, P, and organic carbon (OC) to watercourses and CO 2, CH 4, and N 2 O emissions into the …

employed: dump leaching and vat leaching (vat leaching is the treatment of sand or crushed ore in bedded vats with rapid solution percolation). Typically, heap leaching is chosen for basic financial reasons - for a given situation, it represents the best return on investment. For small operations or operations in politically unstable

 — Enhanced weathering in tropical peatlands may be an ineffective carbon dioxide removal strategy due to pH-induced increases in soil carbon leaching which lead …

Leaching is a chemical process in mining for extracting valuable minerals from ore. Leaching also takes place in nature, where the rocks are dissolved by water. Post leaching, the rocks are left with a smaller proportion of minerals than they originally contained. The leaching process in mining is carried out either as heap leaching or insitu ...

 — The paper focuses on leaching of complex copper–cobalt–nickel ore from Mwinilunga district in Zambia, containing 0.6% Cu, 0.21% Co, 2.6% Fe, and 0.13% Ni. Mineralogical examination of the ore using scanning electron microscope (SEM) showed that copper, cobalt, and nickel exist in fine particles of heterogenite and limonite mineral …

 — Here we show that a reduced evapotranspiration and the resulting increased freshwater discharge in addition to the supply of labile leaf litter produced by re-growing secondary forests increase leaching of …

 — The optimum alkaline leaching conditions of 5% NaOH, temperature 90 to 95 °C in 90 min was obtained for leaching zinc from an oxide ore 17. The column leaching of low grade zinc oxide ore ...

 — Dump leaching. Heap and in-situ leaching characteristics are combined in dump leaching. Depending on the dump location, an impermeable layer may or may not be employed in a dump leach. The ore is dumped to allow similar processing to heap leaching, but the geological conditions of the area allow a valley or pit to act as the sump. Vat …

peat layers is quite low varied between 1.0–1.2%. Leaching characteristics of granulated oil shale fly ash and peat soil samples were determined in labora-tory using a batch leaching test according to European standard EN 12457-2 (2002) [10]. The oil shale fly ash or the peat soil sample (60 g dw.) was leached with

 — Weathered crust elution-deposited rare earth ores are key strategic resources and the main source of medium and heavy rare earths. This paper summarizes the development of leaching technology of rare earth ores, compares the advantages and disadvantages of the three generations of leaching technology, and introduces the …

The leaching of phosphorus from peatlands depends on its chemical form in peat. Therefore analyzing the distribution of various forms of inorganic phosphorus in peat provides …

 — Chalcopyrite ore is one of the most abundant and pertinent oxidized copper minerals. In this research, the dissolution kinetics of chalcopyrite in an ammonia solution was examined. During leaching, the influences of leachant concentration, temperature, and particle diameter on the extent of copper ore dissolution were investigated.

 — The leaching kinetics of aluminum from peat clay using 4 M HCl at dissimilar leaching temperatures (30–90 °C) was investigated. The maximum of aluminum recovery was 91.27% after 60 min of ...

 — The uranium sorption by anion exchange resins from productive solutions prepared by carbonate leaching from peat ore was investigated. The uranium recovery from leach liquors decreased during long-time exploitation of ion exchangers due to contamination of resins with humic substances. The alkaline solution of sodium chloride …