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  • Kinetics and mechanism of arsenopyrite leaching in nitric

    27/11/2020· Laboratory experiments on nitric acid leaching were carried out using a setup consisting of a 0.5 dm 3 round bottom borosilicate glass reaction vessel (Lenz Laborglas GmbH & Co. KG, Wertheim, Germany), with apertures for feeding nitric acid, supplying air from a compressor for oxidation of the resulting nitrogen monoxide, as well as performing temperature control and removal of nitrous gases

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  • NITRIC ACID LEACHING DergiPark

    NITRIC ACID LEACHING T. Ennil KÖSE ABSTRACT : Magnesite (MgCO 3) is a salt-type mineral and is found in large amounts in Turkey. In this study, dissolution of magnesite in nitric acid solutions was investigated. The effects of various parameters such as particle size, reaction temperature, solid to liquid ratio and acid concentration on the leaching process were examined. It was determined

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  • (PDF) Nitric Acid Leaching for Pre-Treatment of a Copper

    Nitric acid is a strong oxidant capable of rapidly oxidizing sulphide minerals. This study was undertaken to evaluate the nitric acid leaching as a potential pre-treatment process prior to

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  • Nitric acid leaching of polymetallic middlings of

    Investigations into the nitric acid leaching of polymetallic middlings with the purpose of the maximal recovery of copper and zinc into the solution are performed. Using methods of mathematical planning of the experiment, the optimal process parameters are determined: ratio L : S = 5, the consumption of nitric acid is 80 cm(3) per 20 g of the

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  • Selective Nitric Acid Leaching of Rare-Earth Elements from

    In this work, nitric acid was used for leaching of REEs and phosphate from Esfordi phosphate concentrate, and the effects of the acid concentration (35–65 wt.%), leaching time (30–90 min) and

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  • Treatment of manufacturing scrap TV boards by nitric acid

    10/06/2014· The nitric acid leaching of STVB for the removal/recovery of valuable metals (Cu and Ag) was studied by adopting the Box–Behnken design. Statistical analysis of data has revealed that the concentration of nitric acid is the most influential parameter affecting the leaching process. Effects of solids ratio and temperature on the rate and extent of the extraction of copper were also proved to

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  • Extraction of Tin and Copper by Acid Leaching of PCBs

    02/02/2013· The leaching time increases drastically when the concentration of nitric acid was reduced. For greater than 50% concentrated acid, reaction was instant and finished within 15 minutes. Whereas for less than 20 % acid concentration, it took about two hours for the reaction to complete.

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  • Sulfuric Acid and Ammonium Sulfate Leaching of Alumina

    direct acid leach process. Nitric acid and hydrochloric acid leaching processes for the recovery of alumina and other metals were developed decades ago. However, these processes have found few practical applications. In addition, hydrochloric acid and nitrate acid are expensive lixiviants in terms of acid cost, and large evaporative losses make these processes highly uneconomical. In contrast

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  • LEACHING OF METALS FROM WASTE PRINTED CIRCUIT BOARDS

    With nitric acid, 98.3% copper leaching was obtained under the optimum conditions of 3 mol/L nitric acid and an agitation speed of 800 rpm at 60°C for 5 h at 25 g/L pulp density. Under optimum conditions and 100 g/L pulp density, the concentration of Cu in the leachate was 21.12 g/L (96%), and the concentrations of Pb, Al, Fe and Ca were 0.52 g/L, 0.91 g/L, 0.13 g/L, 1.70 g/L, respectively

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  • Gold Parting using Nitric Acid

    Metallurgical ContentParting of Zinc and GoldParting of Zinc, Silver, and GoldParting of Copper and GoldSodium and GoldTellurium in Gold The process of parting gold with nitric acid is old, and probably dates from the discovery of nitric acid itself; it is one of the simplest parting processes, and does not require a costly plant or much manipulative skill. The main objection to it is the cost

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  • Investigating of Nitric Acid Leaching of High-Sulfur

    A sufficiently high thermodynamic probability of these reactions in a wide temperature range is established. With the use of mathematical methods, the optimal conditions of the process of nitric acid leaching are selected: the ratio of L:S = 5:1; the concentration of nitric acid 10 mol/L; the duration of the process is 60 minutes. In this case

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  • US2916357A Nitric acid leaching process Google Patents

    Nitric acid leaching process Download PDF Info Publication number US2916357A. US2916357A US694933A US69493357A US2916357A US 2916357 A US2916357 A US 2916357A US 694933 A US694933 A US 694933A US 69493357 A US69493357 A US 69493357A US 2916357 A US2916357 A US 2916357A Authority US United States Prior art keywords iron solution parts nitric acid dissolved

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  • Leaching of Lead Sulfide with Nitric Acid: Geosystem

    At the lower concentration of nitric acid, galena is dissolved into lead nitrate and hydrogen sulfide. However, at the higher concentration of nitric acid, galena is not dissolved but it is changed into lead sulfate as precipitate. The leaching efficiency is strongly dependent upon temperature and nitric acid concentration. The optimal conditions are found to be 40°C and 4–8 N nitric acid

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  • Extraction of Tin and Copper by Acid Leaching of PCBs

    02/02/2013· The leaching time increases drastically when the concentration of nitric acid was reduced. For greater than 50% concentrated acid, reaction was instant and finished within 15 minutes. Whereas for less than 20 % acid concentration, it took about two hours for the reaction to complete.

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  • QUANTITATIVE LEACHING OF A NIGERIAN CHALCOPYRITE ORE

    Keywords: Chalcopyrite ore, Nitric Acid, Leaching, Dissolution Kinetics, Copper Nitrate. INTRODUCTION Chalcopyrite (CuFeS 2) is a sulphide mineral that derived from Greek words “chalkos”, copper and pyrites known as “strike fire” (Szymanowski, 1996). It is the most common copper bearing mineral ever known, occur in igneous and metamorphic rocks and in any metalliferous vein (McGraw

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  • Leaching kinetics of celestite in nitric acid solutions

    09/05/2018· In this study, strontium nitrate extraction from celestite in nitric acid solutions was investigated using the leaching method. The influences of acid concentration, solid-to-liquid ratio, stirring speed, and reaction temperature on the leaching of strontium from celestite concentrate were studied. The results showed that the leaching rate increased with increasing acid concentration, stirring

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  • US3793429A Nitric acid process for recovering metal

    leach nitric acid iron percent sulfide Prior art date 1972-02-18 Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired Lifetime Application number US00227588A Inventor P Queneau J Prater Current Assignee (The listed assignees may be

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  • Nitric Acid Leaching Scientific.Net

    Journal of Biomimetics, Biomaterials and Biomedical Engineering Materials Science. Defect and Diffusion Forum

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  • Acid Attack on Concrete Effects & Results of Acid Attack

    Nitric acid attack is a typical acidic corrosion for shrinkage of the corroded layer due to leaching of highly soluble calcium nitrate. Such volume contractions of the corroded layer, especially for the case of nitric acid, can result in the formation of visually observable cracks across the corroded layer. In the presence of these cracks the transport rate of acid and corrosion products to

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  • Acid Leaching Copper Ore Treatment Method

    Metallurgical ContentAcid Leaching Process FlowsheetCHEMISTRY OF COPPER DISSOLUTIONPREPARATION OF THE COPPER ORESTORAGE AND FEEDING THE ORECOPPER LEACHINGCHARGING THE TANKSCOPPER PRECIPITATIONACID SUPPLYPRODUCTION OF SULPHURIC ACID The treatment of copper ores, both oxides and sulfides by means of flotation,

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