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Copper promoted desulfurization towards the synthesis of ...

Jan 11, 2017  Copper promoted desulfurization towards the synthesis of isothiocyanates. ... Desulfurization is developed by cheap, available and air stable copper catalyst. ... (Diacetoxyiodo)benzene and other harsh reagents, 10 and other mild methods are known. 11 The reported methods are really efficient enough, but most of them possess drawbacks such as ...

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Desulfurization behavior of molten copper alloy by a soda ...

Feb 01, 1998  As a basic study on desulfurizing copper alloy scraps in the remelting process, desulfurization experiments were carried out with a molten Cu-8 pct Sn-0.1 pct P by using a Na2CO3 flux in a 2-kg high-frequency and a 5000-kg low-frequency melting furnace to investigate the influences of the melting atmosphere, the melting temperature, and the flux composition on the desulfurization

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Reactivity of Copper Oxide-Based Sorbent in Coal Gas ...

2. Desulfurization reaction of copper oxide-based sorbent consisted of two steps: reduction of copper oxide and sulfidation of copper with H2S. So, a typical result of the TGA test of copper oxide-based sorbent shows a decrease of weight first by fast reduction reaction and then shows weight gain by sulfidation. The changes of sulfur

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Methods of Metal Recovery by Microorganisms (2 Methods)

Sep 28, 2015  Bioleaching in desulfurization of coal: The process of removal of sulfur containing pyrite (FeS 2 ) from high sulfur coal by microorganisms is referred to as bio desulfurization. High sulfur coal, when used in thermal power stations, emits sulfur dioxide (SO 2 ) that causes environmental pollution.

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Coal Desulfurization by Solvent Leaching Methods

Methods for removing ‘S’: Demineralization and desulfurization of coal may be achieved by both physical and chemical methods. Some demineralization can be achieved by simple physical processes based on the differences in the physical properties of the mineral and carbonaceous parts of the coal [6].

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Coal Desulfurization via Different Methods Request PDF

Most of the effective coal desulfurization techniques are based on chemical methods. Main desulfurization methods are chemical desulfurization, leaching, extraction, flotation, oxydesulfurization ...

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Coal desulfurization and demineralization by chemical ...

Coal is a heterogeneous rock of varying composition. It consists of both organic constituents (macérais) and inorganic components (minerals). The inorganic portion of coal can exist as one or more separate phases or as inorganic elements chelated or ionically bonded to the organic structure (121). A variety of minerals have been reported

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Hydrodesulfurization - Wikipedia

Hydrodesulfurization (HDS) is a catalytic chemical process widely used to remove sulfur (S) from natural gas and from refined petroleum products, such as gasoline or petrol, jet fuel, kerosene, diesel fuel, and fuel oils. The purpose of removing the sulfur, and creating products such as ultra-low-sulfur diesel, is to reduce the sulfur dioxide (SO 2) emissions that result from using those fuels ...

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Copper-catalyzed oxidative desulfurization–oxygenation of ...

A novel copper-catalyzed oxidative desulfurization reaction of thiocarbonyl compounds, using molecular oxygen as an oxidant and leading to formation of carbonyl compounds, has been developed, and the utility of the process is demonstrated by its application to the preparation of

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Desulfurization - Wikipedia

Desulfurization or desulphurisation is a chemical process for the removal of sulfur from a material. This involves either the removal of sulfur from a molecule (e.g. A=S → A:) or the removal of sulfur compounds from a mixture such as oil refinery streams.. These processes are of great industrial and environmental importance as they provide the bulk of sulfur used in industry (Claus process ...

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US4078915A - Method and composition for the ...

US4078915A US05/408,954 US40895473A US4078915A US 4078915 A US4078915 A US 4078915A US 40895473 A US40895473 A US 40895473A US 4078915 A US4078915 A US 4078915A Authority US United States Prior art keywords composition calcium calcium carbide weight polyethylene Prior art date 1972-10-27 Legal status (The legal status is an assumption and is not a legal conclusion.

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US4159906A - Method and composition for the ...

Molten metals, especially molten pig iron, are desulfurized by contacting them with a composition comprising calcium carbide or calcium cyanamide and an additive agent yielding water or hydrogen at the temperature of the molten metal; preferred as the additive agents are the alkali metal hydrides, polyethylene or polyamide for yielding hydrogen and hydrate of lime and alkaline earth borates ...

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Recovery of Copper by Solution Mining Methods

Recovery of Copper by Solution Mining Methods 1 Recovery of Copper by Solution Mining Methods David F. Briggs, Economic Geologist 3514 West Blacksill Drive Tucson, Arizona 85741 Phone - 520-744-4195 Cell - 520-784-3954 Introduction Solution mining is a mining practice that employs solutions (i.e. water or dilute acid) to recover a desired commodity

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Desulfurization of Mercaptobenzimidazole and Thioguanine ...

Organosulfur compounds are known to poison metallic nanoparticle catalysts. Herein NaBH4 is shown to desorb and desulfurize 2-mercaptobenzimidazole (2-MBI) and 6-thioguanine (6-TG) adsorbed on 10, 15, and 50 nm diameter gold nanoparticles (AuNPs). The desulfurization rates decrease significantly with increasing AuNP sizes. Isotope labeling experiments, conducted with NaBD4 in H2O, indicate ...

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Colourimetric determination of copper ore Experiment ...

Samples of copper ore, such as malachite, could be shown, if available. For the second question, work out the concentration of copper in, say, test tube 3: Concentration Cu (as Cu 2+) = 4/10 x 1 M = 0.4 M. Work out the concentration of copper ions when 5 g of copper carbonate is dissolved and made up to 100 cm 3 of solution (formula mass of ...

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Mine Waste Transfer and Disposal Methods - Mine Tailings ...

Rock or Solid Mine Waste. Open pit mining has several stages of waste. First, to access the actual seams or veins of ore, the top layers of rock, or overburden, must be removed. Once the overburden has been removed, the seams can be extracted. When extracting the seams, the additional waste rock will be removed to get to the actual ore, called ...

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4.4 Electrical conductivity of minerals and rocks

Copper 1.7 x 10-8 Iron 10 x 10-8 Mercury 95 x 10-8 Silver 1.6 x 10-8 Steel 15-90 x 10-8 Graphite, a form of carbon, is also an electronic conductor, with a resistivity of 10-4 to 5x10-3 Ohm-m. Graphite occurs in metamorphic rocks and is difficult to distinguish from metallic ore minerals.

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Raney nickel - Wikipedia

Raney nickel / ˈ r eɪ n iː ˈ n ɪ k əl /, also called spongy nickel, is a fine-grained solid composed mostly of nickel derived from a nickel–aluminium alloy. Several grades are known, of which most are gray solids. Some are pyrophoric, but most are used as air-stable slurries. Raney nickel is used as a reagent and as a catalyst in organic chemistry. It was developed in 1926 by American ...

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Desulfurization of aged gold-bearing mine tailings ...

Jul 01, 2019  Desulfurization is a novel approach for the reclamation of abandoned mine sites that can have environmental and economic benefits, particularly when combined with the recovery of valuable elements. Desulfurization by flotation produces sulfide-lean tailings, which can be used as cover materials, and sulfide-rich concentrates, which may contain ...

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Air Pollution Control Technology Fact Sheet

EPA-452/F-03-034 Air Pollution Control Technology Fact Sheet EPA-CICA Fact Sheet Flue Gas Desulfurization1 Name of Technology: Flue Gas Desulfurization (FGD) - Wet, Spray Dry, and Dry Scrubbers Type of Technology: Control Device - absorption and reaction using an alkaline reagent to produce a solid compound.

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Rapid Field and Laboratory Method for the Determination

the standard-series method of estimation, biquinoline reagent was found to be suitable for the determination of traces of copper in soils and rocks under field conditions. The biquinoline method, as a field method for the determination of copper, has five distinct advantages

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Desulfurization of Iron Ores: Processes and Challenges ...

DOI: 10.1002/SRIN.201700568 Corpus ID: 139917014. Desulfurization of Iron Ores: Processes and Challenges @article{Rezvanipour2018DesulfurizationOI, title ...

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Recovery of Copper by Solution Mining Methods

Recovery of Copper by Solution Mining Methods 1 Recovery of Copper by Solution Mining Methods David F. Briggs, Economic Geologist 3514 West Blacksill Drive Tucson, Arizona 85741 Phone - 520-744-4195 Cell - 520-784-3954 Introduction Solution mining is a mining practice that employs solutions (i.e. water or dilute acid) to recover a desired commodity

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The Ancient History of Copper - ThoughtCo

Jan 25, 2020  The ability to extract copper from ore bodies was well-developed by 3000 BCE and critical to the growing use of copper and copper alloys. Lake Van, in present-day Armenia, was the most likely source of copper ore for Mesopotamian metalsmiths, who used the metal to produce pots, trays, saucers, and drinking vessels.

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Air Pollution Control Technology Fact Sheet

EPA-452/F-03-034 Air Pollution Control Technology Fact Sheet EPA-CICA Fact Sheet Flue Gas Desulfurization1 Name of Technology: Flue Gas Desulfurization (FGD) - Wet, Spray Dry, and Dry Scrubbers Type of Technology: Control Device - absorption and reaction using an alkaline reagent to produce a solid compound.

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Mine Waste Transfer and Disposal Methods - Mine Tailings ...

Rock or Solid Mine Waste. Open pit mining has several stages of waste. First, to access the actual seams or veins of ore, the top layers of rock, or overburden, must be removed. Once the overburden has been removed, the seams can be extracted. When extracting the seams, the additional waste rock will be removed to get to the actual ore, called ...

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Desulfurization of aged gold-bearing mine tailings ...

Jul 01, 2019  Desulfurization is a novel approach for the reclamation of abandoned mine sites that can have environmental and economic benefits, particularly when combined with the recovery of valuable elements. Desulfurization by flotation produces sulfide-lean tailings, which can be used as cover materials, and sulfide-rich concentrates, which may contain ...

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Porphyry Copper Deposit Model - USGS

O. Petrology of Associated Sedimentary Rocks. P. Petrology of Associated Metamorphic Rocks. Q. Theory of Ore Deposit Formation. R. Porphyry Copper Exploration and Resource Assessment Guides. S. Geoenvironmental Features. T. Knowledge Gaps and Future Research Directions. U. Broader Implications and Societal Relevance of Porphyry Copper Systems ...

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The Extraction of Copper - Chemistry LibreTexts

Aug 21, 2020  The method used to extract copper from its ores depends on the nature of the ore. Sulfide ores such as chalcopyrite (\(CuFeS_2\)) are converted to copper by a different method from silicate, carbonate or sulfate ores. Chalcopyrite (also known as copper pyrites) and similar sulfide ores are the commonest ores of copper. ...

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4.4 Electrical conductivity of minerals and rocks

Copper 1.7 x 10-8 Iron 10 x 10-8 Mercury 95 x 10-8 Silver 1.6 x 10-8 Steel 15-90 x 10-8 Graphite, a form of carbon, is also an electronic conductor, with a resistivity of 10-4 to 5x10-3 Ohm-m. Graphite occurs in metamorphic rocks and is difficult to distinguish from metallic ore minerals.

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Alterations of lead speciation by sulfate from addition of ...

Jan 01, 2017  The in-vitro bioaccessibility assay (EPA-Method 1340) (US. EPA, 2013) and a modified pH version of EPA-method 1340 (Minka et al., 2013) were used to estimate bioaccessible Pb (the fraction of an ingested dose that crosses the gastrointestinal epithelium and becomes available for distribution to internal target tissues and organs (US.

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Quarrying of Stones: Its Methods, Selection of Site ...

Single blocks as big as 10 meters long and 3 meters thick and 1-3 meters wide can be quarried by this method from soft rocks. Quarrying by Heating: It is an old, crude method which may be useful locally for obtaining small quantities of stones. Rocks are heated for

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Innovations: Introduction to Copper: Mining Extraction

The barren rock, or gangue has to be separated from the sulfide minerals in order to smelt the metallic copper from the ore. By far the greatest proportion of copper is extracted from the sulfides of copper, iron and sometimes other metals. Such ores originate from sulfur-bearing volcanic magmas, which have separated into metal sulfides and siliceous melts.

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Copper Geoscience Australia

One method is to melt them with fluxes in a smelter furnace to produce copper matte, which is a mixture mainly of iron and copper sulfides usually containing 50 to 70% copper. The molten matte is poured into a converter, which contains more fluxes and converted into blister copper

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US 2008/0116113 A1 - Desulfurization Process - The Lens ...

May 22, 2008  [0001] FIG. 1 is a schematic diagram of a desulfurization unit constructed in accordance with the principals of the present invention, particularly illustrating the relative elevations of various vessels employed in the desulfurization unit and the manner in which these vessels are connected so as to allow for circulation of solid particles through the unit.

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Removal of High-Concentration Sulfate Ions from the Sodium ...

The feasibility of removal of sulfate ions from the sodium alkali FGD wastewater using the ettringite precipitation method was evaluated. Factors affecting the removal of sulfate ions, such as NaAlO 2 dosage, Ca(OH) 2 dosage, solution temperature, anions (Cl − , NO 3 − and F #x2212;), and heavy metal ions (Mg2#x2b; and Mn2#x2b;), were investigated, and the ...

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