— In this paper, the authors treat the impact of peat amendment on sorption and leaching of fungicides penconazole and flusilazole in two Algerian topsoil samples (Misserghine and Es-Senia). The batch equilibration technique was applied for adsorption experiments, and leaching was tested through soil column simulated experiments under …
— 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 …
— 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 …
— This paper provides an overview of hydrometallurgical copper extraction studies in which liquid extraction technology has been used with four copper deposits of different compositions. The sulfuric acid …
— 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 …
— Enhanced weathering in tropical peatlands may be an ineffective carbon dioxide removal strategy due to pH-induced increases in soil carbon leaching which lead …
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. …
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
— 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 …
— Uranium processing - Leaching, Extraction, Purification: Roasted uranium ores are leached of their uranium values by both acidic and alkaline aqueous solutions. For the successful operation of all leaching systems, uranium must either be initially present in the more stable hexavalent state or be oxidized to that state in the leaching process. …
— 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.
— 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 …
— 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 ...
— Here, the leaching of a sulfide ore (32% Fe, 2% Cu) is investigated using a mixture of sulfuric acid and hydrogen peroxide (0.15 M H 2 SO 4 and 0.5 M H 2 O 2), in proportions forming a slurry 10% w/w. The leaching process is found to occur in two stages, the first corresponding to an exothermic, peroxide-mediated dissolution, and the second ...
— 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 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 ...
— 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 …
— 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 …
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 …
— 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 …
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 typical AL leaching process involves direct leaching of nickel laterite ores with both inorganic and/or organic acids by either agitation or heap leaching. In this process metals within the ore are liberated in the acidic environment, then the metal rich leach solution selectively precipitated for metal recovery by various methods including ...
Peat moss reduces leaching of nutrients in or added to the soil, releasing them slowly over time thereby reducing the amount of fertilizer used. Protect Soil. Peat moss protects soil from hardening and adds organic material. Make Compost Better. Peat moss speeds the composting process, reduces odors and controls air and water in the compost pile.
— 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 …
— The biodissolution of uranium is a consequence of hydrometallurgical treatment of ore with microbial intervention. Uranium bioleaching is mainly driven by the combined action of Fe(III) and the protons that are produced by the activity of chemolithotrophic micro-organisms which use either iron or sulfur as their energy source …
ammonium, the carbonate leaching regime was selected, viz. (Na2CO3) via chloride-carbonate solutions (soda). In choosing the location of the site for conducting experiments to determine the main fi ltration parameters of ore-bearing peat bogs and the experimental cell for carrying out fi eld experiments on leaching,
— Key Terms. ore leaching: The process of recovering metals from ores by using a number of different techniques.; Microbial ore leaching (bioleaching) is the process of extracting metals from ores with the use …
— 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 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 …
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
— On the other hand, recent peat samples from TP B showed higher removal and lower leaching of Sb, which may be connected to higher leaching of sulfate from these samples (Fig. 7). A comparison of distribution coefficients—between older and newer samples—indicated that Sb removal and leaching was negatively linked to sulfate …
— 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 …
— 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.
— Metallurgy - Leaching, Extraction, Refining: Oxides are leached with a sulfuric acid or sodium carbonate solvent, while sulfates can be leached with water or sulfuric acid. Ammonium hydroxide is used for native ores, carbonates, and sulfides, and sodium hydroxide is used for oxides. Cyanide solutions are a solvent for the precious metals, …
— 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 …
— Leachate characteristics suggest treatment for secure water provision. Pollutant leaching from wildfire-impacted peatland soils (peat) is well-known, but often …
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 ...
