role of concentrated acids in mining

    • What acid is useful for extraction of alkaloids?

      For aporphine and tetrahydroprotoberberine alkaloids the acid-base extraction could be performed using hydrochloric acid (HCl) 3% and ammonium hydroxide concentrated in the end of the extraction. Cite

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    • Mining with acid-generating bacteria

      2019-12-18 · Mining with acid-generating bacteria Sulfuric acid production by sulfur-oxidizing bacteria may be a solution to a long standing mining problem. ... With a little bit of engineering, they could provide an alternative to transporting concentrated sulfuric acid …

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    • Green Gold Extraction | Mining & Energy

      2016-8-29 · The concentrated acid is usually a nasty chemical, like cyanide. Over the years, engineers have tried to refine the current harmful process with no luck in terms of lessening the environmental impact. Rather than simply refining the outdated harmful processes of gold extraction in mining, the Saskatchewan team of chemists set out to create an ...

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    • The Role of Oxygen Transfer in Acid Mine Drainage …

      The role of oxygen transfer in acid mine drainage (AMD) treatment Craig C. Hustwit, Terry E. Ackman, Patricia E. Erickson ABSTRACT: A study was conducted to evaluate two chemical models of iron oxidation. The first model was proposed by U. S. EPA in 1983 for use in the design of acid mine drainage (AMD) treatment systems.

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    • Why sulfuric acid is added in the preparation of esters ...

      2011-3-22 · The concentrated sulphuric acid solution is the preferred catalyst for the preparation of esters. Rarely used is the hydrochloric acid as a gas.

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    • The role of membrane technology in acid mine water ...

      2019-9-2 · The activities of mining industries are attracting more scrutiny as the concern of limitations of conventional technology for wastewater treatment and the potential use of wastewater have resulted in accelerated attention in membrane technologies. The paucity of water and industrial environmental guidelines has resulted in the application of membrane technologies in wastewater treatment ...

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    • Uses of Phosphoric Acid

      Pure phosphoric acid is usually in a crystalline solid-state and in less concentrated form. Generally, it is a colourless, syrupy, odourless, and non-volatile liquid. Phosphoric acid which is also a mineral acid is represented by the formula H 3 PO 4 and it contains one atom of phosphorus, four atoms of oxygen and three atoms of hydrogen.

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    • state the role of concentrated sulphuric acid in ...

      2021-2-15 · Methanesulfonic acid concentrated solutions at temperatures between 150 °C and 180 °C fail to etch silicon nitride in similar experimental conditions to concentrated phosphoric acid solutions, disproving a traditional hypothesis that the role of the phosphoric acid etchant at high temperatures is as a vehicle for facilitating water molecules ...

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    • The Social and Environmental Consequences of Coal …

      2013-3-12 · The concentration of capital in gold mining gave the South African economy its basic structure organized around six dominant groupings of capital which extend into manufacture, banking and retail, but have at their basis a historic investment in mining. Coal mining played a supportive role as provider of energy to the growing gold

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    • On the role of Fe(III) ions on the Reduction Mechanisms of ...

      2019-12-27 · This was ascribed to the fact that Fe(III) modifies the chemical equilibrium in concentrated nitric acid by generating reduced species of nitric acid such as NO 2. Then, the presence of these species catalyses the reduction of nitric acid with a mechanism which can tuned depending on the concentration in Fe(III) and the applied potential.

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    • What is the role of sulfuric acid in nitration?

      2020-1-15 · What is the role of sulphuric acid in nitration of benzene? It reacts with concentrated nitric acid to form the nitronium ion which acts as an electrophile in the reaction, and the catalyst is regenerated with the proton that forms as a product of the reaction.

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    • organic chemistry

      2021-10-3 · In concentrated sulfuric acid there is little to no water (note that we also start off with little to no ethylene). ... The equilibrium shifts to produce reactants. As for the role of sulfuric acid, it acts as a proton source to enable the loss of leaving group in the forward direction and the electrophilic addition in the reverse direction. Share.

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    • organic chemistry

      2017-6-29 · Concentrated sulfuric acid is often used as a catalyst in Fischer esterification reactions. To my knowledge, the role it plays in the reaction is not as a reducing agent or dehydrating agent but only serves the role of creating an acidic environment, as seen in the mechanism. Thus, dilute sulfuric acid would be sufficient.

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    • Interaction of organic acids and pH on multi-heavy metal ...

      acids(acetic,oxalic,malic,fumaric,tartaricandcitricacids)at pH 7, the extraction of Pb, Cd, Zn and Cu from the acid mine soil was much higher than that from the alkaline mine soil, in which only citric acid with higher concentration was capable of extracting some heavy metals. Citric acid had the strongest

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    • On the role of Fe(III) ions on the Reduction Mechanisms …

      2021-9-21 · 1 1 On the role of Fe(III) ions on the Reduction Mechanisms of 2 Concentrated Nitric Acid 3 J. Pellé1,2, N. Gruet2, B. Gwinner2, M. Schlegel3, V. Vivier1 4 1Sorbonne Université, CNRS, Laboratoire Interfaces et Systèmes Electrochimiques, 4 place 5 Jussieu, F-75005, Paris, France 6 2Den – Service de la Corrosion et du Comportement des Matériaux dans leur Environnement

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    • State the role of concentrated sulphuric acid in the ...

      2021-8-9 · State the role of concentrated sulphuric acid in the esterification reaction. provide the equa... Questions in other subjects: Physics, 03.11.2020 02:01. The potentiometer wire of length 500cm has a resistance of 50Ω is connected in series with a resistance of 100Ω and an accumulator of emf 10V having negligible resi...

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    • What is the purpose of adding phosphoric acid in the ...

      Concentrated sulfuric acid is used as a catalyst, and has a dual role: Speeds up the reaction. Acts as a dehydrating agent, forcing the equilibrium to the right and resulting in a greater yield of ester. What was the purpose of the concentrated sulfuric acid in the first step?

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    • Biodegradation of Concentrated Benzoic Acid Using White ...

      2020-7-14 · Benzoic acid (BA) is potentially toxic to humans and recalcitrant in the environment. Although it may be degraded by fungi, potential degradation pathways has received limited study. In the present work, concentrated BA degradation by Hypocrea lixii AH, a type of soil-borne or wood-decaying fungi, was investigated. The degradation products were ...

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    • Diffusion of sulfuric acid in concentrated solutions ...

      1993-8-1 · The U.S. Department of Energy''s Office of Scientific and Technical Information

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    • Rare Earth Elements in Acid Mine Drainage

      2017-9-20 · 2002; Tertre et al., 2005). As a consequence, REE are mainly concentrated in clays, which become a major reservoir of REE in sedimentary rocks. If the primary rock is rich in REE, weatheringclay s may become an economical target for mining, such as …

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    • Why do we use acids for heavy metal extraction?

      2015-11-3 · 16th May, 2013. Dan Brian Short. Robert Morris University. Principles of Acid Digestion and Selection of Acid. (i) HNO3 acts as both acid and oxidizing agent. As acid it dissolves inorganic oxides ...

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    • Sulfuric Acid

      2015-8-13 · is a strong acid. It is an odorless, clear to dark brown, oily liquid that is corrosive. Sulfuric acid has many industrial purposes and is produced in greater quantities than any other chemical worldwide. In metal mining, sulfuric acid is used to leach copper oxide minerals. In one process, a solution of sulfuric acid laden

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    • state the role of concentrated sulphuric acid in ...

      2018-2-21 · 68 answers. 8.1K people helped. Esterification is a relatively slow process at room temperature and does not proceed to completion. Concentrated sulfuric acid is used as a catalyst, and has a dual role: Speeds up the reaction. Acts as a dehydrating agent, forcing the equilibrium to the right and resulting in a greater yield of ester.

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    • What Is the Function of Sulfuric Acid in Esterification?

      Sulfuric acid is a colorless, odorless and oily liquid. Esterification, or the combining of an alcohol with an acid to produce an ester, is a form of condensation reaction, since water is eliminated in the process. The reverse reaction can also occur: the ester can recombine with water to produce the alcohol and acid.

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    • Ecological roles of dominant and rare prokaryotes in acid ...

      High-throughput sequencing is expanding our knowledge of microbial diversity in the environment. Still, understanding the metabolic potentials and ecological roles of rare and uncultured microbes in natural communities remains a major challenge. To this end, we applied a ''divide and conquer'' strateg …

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    • On the role of Fe(III) ions on the reduction mechanisms of ...

      The reduction mechanism of concentrated HNO 3 (4 mol L −1) was investigated on a gold electrode at 40 °C by coupling electrochemical methods (cyclic voltammetry, chrononamperometry and electrochemical impedance spectroscopy) with chemical analysis of solution by Raman spectroscopy and the gas analysis by mass spectrometry was demonstrated that in such conditions, Fe(III) promotes the ...

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