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Leaching
Leaching is the loss or extraction of certain materials from a carrier into a liquid (usually, but not always a solvent). and may refer to: *Leaching (agriculture), the loss of water-soluble plant nutrients from the soil; or applying a small amount of excess irrigation to avoid soil salinity *Leaching (chemistry), the process of extracting substances from a solid by dissolving them in a liquid *Leaching (metallurgy), a widely used extractive metallurgy technique which converts metals into soluble salts in aqueous media **Dump leaching, an industrial process to extract metals from ore taken directly from the mine and stacked on the leach pad without crushing **Heap leaching, an industrial process to extract metals from ore which has been crushed into small chunks **Tank leaching, a hydro metallurgical method of extracting valuable material from ore **In-situ leaching, a process of recovering minerals such as copper and uranium through boreholes drilled into the deposit *Leaching (ped ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leaching (chemistry)
Leaching is the process of a solute becoming detached or extracted from its carrier substance by way of a solvent. Leaching is a naturally occurring process which scientists have adapted for a variety of applications with a variety of methods. Specific extraction methods depend on the soluble characteristics relative to the sorbent material such as concentration, distribution, nature, and size. Leaching can occur naturally seen from plant substances (inorganic and organic), solute leaching in soil, and in the decomposition of organic materials. Leaching can also be applied affectedly to enhance water quality Water quality refers to the chemical, physical, and biological characteristics of water based on the standards of its usage. It is most frequently used by reference to a set of standards against which compliance, generally achieved through tr ... and contaminant removal, as well as for disposal of hazardous waste products such as fly ash, or Rare-earth element, rare ear ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leaching (agriculture)
In agriculture, leaching is the loss of water-soluble plant nutrients from the soil, due to rain and irrigation. Soil structure, crop planting, type and application rates of fertilizers, and other factors are taken into account to avoid excessive nutrient loss. Leaching may also refer to the practice of applying a small amount of excess irrigation where the water has a high salt content to avoid salts from building up in the soil (salinity control). Where this is practiced, drainage must also usually be employed, to carry away the excess water. Leaching is a natural environment concern when it contributes to groundwater contamination. As water from rain, flooding, or other sources seeps into the ground, it can dissolve chemicals and carry them into the underground water supply. Of particular concern are hazardous waste dumps and landfills, and, in agriculture, excess fertilizer, improperly stored animal manure, and biocides (e.g. pesticides, fungicides, insecticides and herb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leaching (metallurgy)
Leaching is a process widely used in extractive metallurgy where ore is treated with chemicals to convert the valuable metals within into soluble salts while the impurity remains insoluble. These can then be washed out and processed to give the pure metal; the materials left over are commonly known as tailings. Compared to pyrometallurgy, leaching is easier to perform, requires less energy and is potentially less harmful as no gaseous pollution occurs. Drawbacks of leaching include its lower efficiency and the often significant quantities of waste effluent and tailings produced, which are usually either highly acidic or alkali as well as toxic (e.g. bauxite tailings). There are four types of leaching: # Cyanide leaching (e.g. gold ore) # Ammonia leaching (e.g. crushed ore) # Alkali leaching (e.g. bauxite ore) # Acid leaching (e.g. sulfide ore) Chemistry Leaching is done in long pressure vessels which are cylindrical (horizontal or vertical) or of horizontal tube form know ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
In-situ Leaching
In-situ leaching (ISL), also called in-situ recovery (ISR) or solution mining, is a mining process used to recover minerals such as copper and uranium through boreholes drilled into a deposit, ''in situ''. In situ leach works by artificially dissolving minerals occurring naturally in a solid state. For recovery of material occurring naturally in solution, see: Brine mining. The process initially involves the drilling of holes into the ore deposit. Explosive or pathways in the deposit for solution to penetrate. Leaching solution is pumped into the deposit where it makes contact with the ore. The solution bearing the dissolved ore content is then pumped to the surface and processed. This process allows the extraction of metals and salts from an ore body without the need for conventional mining involving drill-and-blast, open-cut or underground mining. Process In-situ leach mining involves pumping of a lixiviant into the ore body via a borehole, which circulates through the porous ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leaching (pedology)
In pedology, leaching is the removal of soluble materials from one zone in soil to another via water movement in the profile. It is a mechanism of soil formation distinct from the soil forming process of eluviation, which is the loss of mineral and organic colloids. Leached and eluviated materials tend to be lost from topsoil and deposited in subsoil. A soil horizon accumulating leached and eluviated materials is referred to as a zone of illuviation. Laterite soil, which develops in regions with high temperature and heavy rainfall, is an example of this process in action. See also *Bioleaching *Biomineralisation *Dissolved load *Leaching (agriculture) *Groundwater recharge *Soil salinity control Soil salinity control relates to controlling the problem of soil salinity and reclaiming salinized agricultural land. The aim of soil salinity control is to prevent soil degradation by salination and reclamation of already salty (saline) soil ... References {{reflist Economic g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tank Leaching
In Metallurgy, metallurgical processes tank leaching is a Hydrometallurgy, hydrometallurgical method of extracting valuable material (usually metals) from ore. Tank vs. vat leaching Factors Tank leaching is usually differentiated from vat leaching on the following factors: # In tank leaching the material is ground sufficiently fine to form a slurry or pulp, which can flow under gravity or when pumped. In vat leaching typically a coarser material is placed in the vat for leaching, this reduces the cost of size reduction; # Tanks are typically equipped with Batch reactor#Agitation, agitators, Baffle (in vessel), baffles, gas introduction equipment designed to maintain the solids in suspension in the slurry, and achieve leaching. Vats usually do not contain much internal equipment, except for agitators. # Tank leaching is typically Continuous stirred-tank reactor, continuous, while vat leaching is operated in a batch fashion, this is not always the case, and commercial processes usin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leachate
A leachate is any liquid that, in the course of passing through matter, extracts soluble or suspended solids, or any other component of the material through which it has passed. Leachate is a widely used term in the environmental sciences where it has the specific meaning of a liquid that has dissolved or entrained environmentally harmful substances that may then enter the environment. It is most commonly used in the context of land-filling of putrescible or industrial waste. In the narrow environmental context leachate is therefore any liquid material that drains from land or stockpiled material and contains significantly elevated concentrations of undesirable material derived from the material that it has passed through. Landfill leachate Leachate from a landfill varies widely in composition depending on the age of the landfill and the type of waste that it contains. It usually contains both dissolved and suspended material. The generation of leachate is caused principally b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heap Leaching
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 re-separate 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 ore, whereas ''in situ'' mining lacks these liners and pulls pregnant solution up to obtain the minerals. Heap leaching is widely used in modern large-scale mining operations as it produces the desired concentrates at a lower cost compared to conventional processing methods such as flotation, agitation, and vat leaching. Additionally, dump leaching is an essential part of most copper mining operations and determines the quality grade of the produced material along with other factors Due to the profitability that the dump leaching has on the mining process, i.e. it can contribute substanti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bioleaching
Bioleaching is the extraction of metals from their ores through the use of living organisms. This is much cleaner than the traditional heap leaching using cyanide. Bioleaching is one of several applications within biohydrometallurgy and several methods are used to recover copper, zinc, lead, arsenic, antimony, nickel, molybdenum, gold, silver, and cobalt. Process Bioleaching can involve numerous ferrous iron and sulfur oxidizing bacteria, including '' Acidithiobacillus ferrooxidans'' (formerly known as ''Thiobacillus ferrooxidans'') and ''Acidithiobacillus thiooxidans '' (formerly known as ''Thiobacillus thiooxidans''). As a general principle, Fe3+ ions are used to oxidize the ore. This step is entirely independent of microbes. The role of the bacteria is further oxidation of the ore, but also the regeneration of the chemical oxidant Fe3+ from Fe2+. For example, bacteria catalyse the breakdown of the mineral pyrite (FeS2) by oxidising the sulfur and metal (in this case ferrous ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leach (other)
Leach may refer to: * Leach (surname) * Leach, Oklahoma, an unincorporated community, United States * Leach, Tennessee, an unincorporated community, United States * Leach Highway, Western Australia * Leach orchid * Leach phenotype, a mutation in the gene encoding Glycophorin C * Low Energy Adaptive Clustering Hierarchy (LEACH), a routing protocol in wireless sensor networks * "Leach", a song by Cryptopsy off their album ''The Unspoken King'' * River Leach, England, United Kingdom * Leach Range, a mountain range in Elko County, Nevada * Leach (food), jelly-like sweetmeat popular in the 1600s See also * Leach field, or septic drain field * Leaching (other) Leaching is the loss or extraction of certain materials from a carrier into a liquid (usually, but not always a solvent). and may refer to: * Leaching (agriculture), the loss of water-soluble plant nutrients from the soil; or applying a small amou ... * Leech (other) * {{disambiguation, geo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leech (other)
Leeches are segmented parasitic or predatory Annelid worms. Leech may also refer to: Film and television * '' The Leech (1921 film)'' * ''The Leech (1956 film)'' * '' Leeches!'', a 2003 film * Leech (''Masters of the Universe''), a character from ''He-Man and the Masters of the Universe'' * "Leech", an episode of ''Smallville'' * Leech (character)#In Other Media, a fictional Morlock in the Marvel Universe Music * "Leech" (song), a 2008 song by the Gazette * "Leech", a song by Bullet for My Valentine from their album '' Temper Temper'' * "Leech", a song by Northlane from their album ''Node'' Places in the United States * Leech Creek, a stream in Wisconsin * Leech Lake, in Cass County, Minnesota * Leech Lake (Chisago County, Minnesota) Science and technology * Leeching (medical), a form of bloodletting in medieval and early-modern medicine which used leeches * Leech (computing), someone who uses others' information or effort but does not provide any in return Other uses * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dump Leaching
Dump leaching is an industrial process to extract precious metals and copper from ores.. Dump leaching is similar to heap leaching, however in the case of dump leaching ore is taken directly from the mine and stacked on the leach pad without crushing where, in the case of gold and silver, the dump is irrigated with a dilute cyanide Cyanide is a naturally occurring, rapidly acting, toxic chemical that can exist in many different forms. In chemistry, a cyanide () is a chemical compound that contains a functional group. This group, known as the cyano group, consists of ... solution that percolates through the ore to dissolve gold and silver. The solution containing gold and silver exits the base of the dump, is collected and precious metals extracted. The resultant barren solution is recharged with additional cyanide and returned to the dump. This method of leaching is usually suitable for low grade ores because it is very low cost. However, it operates with slow kinetics ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
