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3 edition of Initial-Stage Sulfuric Acid Leaching Kinetics of Chalcopyrite Using Radiochemical Techniques. found in the catalog.

Initial-Stage Sulfuric Acid Leaching Kinetics of Chalcopyrite Using Radiochemical Techniques.

United States. Bureau of Mines.

Initial-Stage Sulfuric Acid Leaching Kinetics of Chalcopyrite Using Radiochemical Techniques.

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  • 15 Currently reading

Published by s.n in S.l .
Written in English


Edition Notes

1

SeriesReport of investigations (United States. Bureau of Mines) -- 7823
ContributionsBaur, J., Gibbs, H., Wadsworth, M.
ID Numbers
Open LibraryOL21739782M

  The head of the Science Department was given the following advise on how to dispose of 2 dm³ of concentrated sulphuric acid that was badly contaminated and no longer suitable for use in the laboratory: "Pour it down the concrete drain leading from the laboratory, when there is a heavy shower of rain." Give your view on this advice with THREE supporting reasons. SULFUR TRIOXIDE AND SULFURIC ACID. 4. PRODUCTION, IMPORT/EXPORT, USE, AND DISPOSAL PRODUCTION Table 4-l lists the facilities in each state that manufacture or process sulfuric acid, the intended use, and the range of maximum amounts of sulfuric acid that are stored on site. The data listed in Table 4-l are derived. If we are talking about industrial amounts, the sulphuric acid disposal plant of the norwegian textile industry is a 30 yard hole dug into granite. The walls of the hole is covered with a membrane (granite is actually not solid and will suck up th. Given that this second dissociation of sulfuric acid constitutes the definition of a strong acid, it is safe to say that sulfuric acid's second proton dissociates "completely" enough that most people don't really care about the intermediate, essentially non-existent bisulfate ion. .


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Initial-Stage Sulfuric Acid Leaching Kinetics of Chalcopyrite Using Radiochemical Techniques. by United States. Bureau of Mines. Download PDF EPUB FB2

Get this from a library. Initial stage sulfuric acid leaching kinetics of chalcopyrite using radiochemical techniques. [John P Baur; H L Gibbs; Milton E Wadsworth; United States. Bureau of. Initial-stage sulfuric acid leaching kinetics of chalcopyrite using radiochemical techniques / By John P.

Baur, joint author. Milton E. Wadsworth, joint author. The anodic behaviour of chalcopyrite in 1 M H2SO4 and 1 M HCl was studied by linear sweep voltammetry and potentiostatic electrolysis. Voltammograms with a fresh surface showed a small prewave, attributed to a surface oxidation process, followed by a region of active dissolution characterized by a steeply rising anodic by: this work was to examine the leaching of the chalcopyrite concentrate, from “Rudnik”flotation plant, by.

sodium nitrate in sulphuric acid media. The probabilities of various chemical reactions occurring was based. upon literature data, thermodynamic analysis, and the products formed during the leaching process.

Leaching kinetics of copper from chalcopyrite concentrate in nitrous-sulfuric acid samples, determined from measurements on an HORIBA/Partica LAV2 Particle Size Analyzer, was 35 μm. Ultrafine milling of the as-received material to 15 μm was performed using a ball mill.

The size of the product was confirmed by particle size analysis. The leaching of chalcopyrite follows the parabolic use of ozone as an oxidizing agent establishes conditions under which no elemental sulfur on leached surfaces can form.

The kinetics of leaching Initial-Stage Sulfuric Acid Leaching Kinetics of Chalcopyrite Using Radiochemical Techniques. book with temperature because the solubility of ozone in. Sulfate-based leaching processes for chalcopyrite (CuFeS 2) are attractive because of their inherent simplicity.

Unfortunately, high copper extractions are not attainable in a reasonable residence time unless the leaching temperature exceeds °C (oxygen pressure leaching) or chalcopyrite is ‘activated’ by a pretreatment method prior to leaching.

In the present work, the oxygen pressure. Leaching Chalcopyrite is the holy grail for hydrometallurgists (Leachers), difficult to leach as the sulfur forms a layer over the mineral and makes the leaching slow. Having said that, it is not % not leachable, not unusual for ore dumps (low grade) containing chalcopyrite to be placed under leach.

The leaching of copper from chalcopyrite in H 2 SO 4 solution under pressure-oxidative conditions and its kinetics were investigated in this study. Leaching variables that affect the rate of copper dissolution from chalcopyrite are agitation speed (– rpm), total pressure (– MPa), temperature (– °C), and sulfuric acid concentration (– M).Cited by: 5.

A Review on Novel Techniques for Chalcopyrite Ore Processing Alafara A. Baba 1,2,*, Kuranga I. Ayinla3, kinetics and microbial studies of chalcopyrite ore were discussed.

sulfuric acid so that leaching is reasonably straight forward. A copper extraction of approximately 22% was obtained in sulfuric acid leaching of sole chalcopyrite, and a copper extraction Initial-Stage Sulfuric Acid Leaching Kinetics of Chalcopyrite Using Radiochemical Techniques. book > 80% could be obtained when 2 g of pyrite was added.

It can also be found that the Initial-Stage Sulfuric Acid Leaching Kinetics of Chalcopyrite Using Radiochemical Techniques. book of pyrite changed the concentrations of the solution compositions, including Cu 2 +, Fe 2 + and Fe 3 Cited by: Hydrometallurgical processes offer great potential for treating complex sulphide concentrates, especially chalcopyrite concentrate, resulting in increased metal recoveries and reduced air pollution hazards.

The main outcomes are the production of elemental sulphur or sulphuric acid and soluble copper by: Speciation of the Sulfuric Acid-Ferric Initial-Stage Sulfuric Acid Leaching Kinetics of Chalcopyrite Using Radiochemical Techniques.

book Sulfate-Water System and its Application to Chalcopyrite Leaching Kinetics up to ºC by Guikuan Yue B. Eng., Henan University, M. Eng., Institute of Process Engineering, Chinese Academy of Sciences, A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OFCited by: 2.

This study reports the effect of sulfuric acid concentration on chalcopyrite chemical leaching in very simple H2SO4 solution systems ranging from 23g/L to 30g/L, with % chalcopyrite concentrate at 30°C. Copper extraction from chalcopyrite increases with an increase in sulfuric acid concentration, e.g.

86%, 90% and 92% after 96 days at 23g/L, 25/L and 27g/L H2SO4 solution Author: Seong Jin Joe, Tadashi Chida, Masatoshi Sakoda, Hidekatsu Nakamura, Muneyuki Tamura, N. Sato. By using the Plackett Burman method, it was possible to select the variables that had the largest influence on the percentage of copper extracted at the sulfuric acid leaching stage.

These were temperature of leach solution, stirring speed, concentration of sulfuric acid in the leach solution and particle size of the ore. In addition, an ideal oxidant for leaching of chalcopyrite should be applicable for heap leaching at atmospheric pressure while some oxidants are only efficient in tank and high pressure leaching.

Peroxydisulfate is a very strong oxidizing agent which has an ability to be made from sulfuric acid using an electrochemical cell atCited by: 4. However, the leaching kinetics for certain minerals like covellite is poorly understood. This thesis investigates the kinetics of covellite leaching in a ferric-sulfate-sulfuric acid media, with an emphasis first placed on the understanding of the effect of the most common variables such as Cited by: 1.

Sulphuric acid leaching of zinc and copper from Nigerian Complex sulphide ore also be catalyzed into hydroxyl radicals, which are extremely reactive.

The dissolution of ores using sulphuric acid in conjunction with hydrogen peroxide has been studied and successful results were obtained. Jiang et File Size: KB. The results of a leaching kinetics study of boron slurry with sulfuric acid were presented.

Effect of ore particle size, reaction temperature, and acid concentration on magnesium dissolution rate were determined.

The results shown that leaching of about % of magnesium was achieved using (+ ) mesh ore particle size at a reaction temperature of 60°C for reaction time min with 25 Author: Feng Gao, Xiang Guang Xu, Lei Li, Huai Yu Sun, Hong Xin Wang.

Srećko Stopić et al.: Sulphuric Acid Leaching of the Serbian Nickel Lateritic Ore Laterites are oxide ores widely distributed in the equatori-al regions.

Lateritic deposits usually consist of three layers, namely the limonitic, the saprolitic and garnieritic layer. It is known that 54 % of the total reserves of nickel are found in laterites [1].File Size: KB. Abstract: The leaching kinetics and mechanism of priceite having the formula of 4CaO 5B 2 O 3 7H 2 O was investigated in sulphuric acid solutions.

For the dissolution process, the effects of reaction temperature, sulphuric acid solution concentration, solid/liquid ratio, particle size, and stirring speed were investigated. Initial-stage sulfuric acid leaching kinetics of chalcopyrite using radiochemical techniques / ([Washington, D.C.]: U.S.

Bureau of Mines, []), by John P. Baur, Milton E. Wadsworth, H. Gibbs, Salt Lake City Metallurgy Research Center (U.S.), and United States. Bureau of. Dilute sulfuric acid-ferric sulfate has been found to be an excellent solvent for oxide minerals as well as for such sulfide forms as chalcocite and covelite but not chalcopyrite.

Percolation can be either upward with solutions entering at the bottom and overflowing at the top or downward where solutions are added at the top with bottom drainage.

Dorfling, C. and Akdogan, G. and Bradshaw, S.M. and Eksteen, J.J. Kinetics of RH, RU, and IR dissolution during the Sulphuric Acid Pressure Leaching of First Stage Leach Residue, in Proceedings of the 26th International Mineral Processing Congress, IMPCSeppp.

Cited by: 2. The sensitivity of radiochemical techniques makes possible the study of the initial-stage sulfuric acid leaching kinetics of chalcopyrite and other copper sulfide minerals.

This Bureau of Mines study of the initial leaching of chalcopyrite used techniques to evaluate the molecular and electrochemical. ferric ion concentrations, sulfuric acid concentrations and stirring speeds. The leaching kinetics and mechanism were studied. When the temperature ranged between 30−75 °C, the pyrite leaching was mainly controlled by chemical reaction with positive correlation to the ferric ion concentration.

through intensive milling of a chalcopyrite mineral sample on its BET surface area and the subsequent effect on its leaching reaction rate and mechanism. Leaching kinetics mechanisms of the raw and mechanically activated chalcopyrite in the sulfuric acid-ferric sulfate media have been investigated.

Chalcopyrite Leaching in Acidic Chloride Solution without Sulphates To determine the effect of dissolved oxygen and its partic-ipation in the reactions that take place on the surface of the chalcopyrite, tests were performed in solutions with and with-out dissolved Cited by: 2. Leaching Leaching conditions were set using the results of a previous study [12] together with those of some preliminary tests.

Leaching media was M sulfuric acid solution containing M ferric sulfate. Pulp density was 1g solid to ml solution. Leaching temperature was changed from 40 to 70 oC and leaching time was varied.

Keywords: Chalcopyrite, Iron(III) oxide, Sulphation, Dissolution, Sulphuric acid Chalcopyrite (CuFeS 2), a sulphidic copper mineral, is the primary sources of copper.

The direct production of copper sulphate from sulphidic copper ores is an important route to recover copper. The conditions, however, are dependent on temperature and. The leaching rate increased with increase in the temperature. About 50% of the Cu recovery was obtained after 2 hours of reactor leaching at 75 o C using the mm size fraction.

Also about 50% of the Cu recovery was obtained after 60 days of column leaching for the + mm size fraction. For the fine-particle leaching, the first. R Manufacture of Sulfuric Acid In the manufacture of sulfuric acid from sulfur, the first step is the burning of sulfur in a furnace to form sulfur dioxide: Following this step, the sulfur dioxide is converted to sulfur trioxide, using a catalyst: A flowsheet of a typical sulfuric acid File Size: KB.

gained by hydrometallurgical leaching processes, mainly by heap leaching with sulfuric acid and subsequent solvent extraction (SX) and electro winning (EW) treatment. Typical ore heaps in heap leaching are 4 - 12 m high and have a base area of several thousand square meters and are made up of-t of ore.

KINETICS OF THE LEACHING OF SPHALERITE IN ACIDIC FERRIC SULPHATE MEDIA IN THE PRESENCE AND ABSENCE OF OXYGEN. Frank Kenneth Crundwell. A dissertation submitted to the Faculty of Engineering, University of the Vitwatersrand, Johannesburg, in fulfilment of the requirements for the degree of Master of Science in Engineering.

Johannesburg, Sulfuric acid is a very common type of rain has sulfuric acid in it. Acid rain harms plants, fish, and other living things. A type of air pollution causes acid people burn fossil fuels like oil and coal, the smoke has a chemical in it called sulfur the sulfur dioxide gas comes into contact with water droplets in the atmosphere, it changes into sulfuric acid.

Copper processing is a complicated process that begins with mining of the ore (less than 1% copper) and ends with sheets of % pure copper called cathodes, which will ultimately be made into products for everyday most common types of ore, copper oxide and copper sulfide, undergo two different processes, hydrometallurgy and pyrometallurgy, respectively, due to the different.

tonnes in Smelter acid will be more than 25% of world sulphuric acid production com-pared to some 18% in Table 2 Production of Sulphuric Acid in the Countries of the European Community Sulphuric acid is produced in all the countries of Europe with the major producers being Germany, Spain, France, Belgium and Size: KB.

I have about 30 ml of leftover Sulfuric acid. There is a similar thread on this board suggesting ways to dispose of it. They involve adding baking soda after adding the sulfuric acid to water. However, the MSDS sheet for sulfuric acid contains the following statement which scares me: "A violent exothermic reaction occurs with water.".

Sulfuric acid (alternative spelling sulphuric acid), also known as oil of vitriol, is a mineral acid composed of the elements sulfur, oxygen and hydrogen, with molecular formula H 2 SO is a colorless, odorless, and viscous liquid that is soluble in water and is synthesized in reactions that are highly exothermic.

Its corrosiveness can be mainly ascribed to its strong acidic nature, and E number: E (acidity regulators, ). How to make sulfuric acid by electrolysis of copper sulfate using an inert anode. Copper sulfate is very easy to obtain in large quantities at gardening and hardware stores and provides a.

Sulfuric Acid using Catalytic ng with the Raw Pdf, Industrial Processes involved,Reaction Sequence Mechanism,Catalyst Used,its Role and finally the annual production and ir-Hinshelwood Model and Rideal-Eley Model have .There is a direct reaction to convert pyrite to sulfuric acid by treating download pdf with nitric acid.

$$\ce{FeS2 + 18HNO3 → Fe(NO3)3 + 2H2SO4 + 15NO2 + 7H2O}$$ Iron(II) disulfide react with and nitric acid to produce iron(III) nitrate, sulfuric acid, nitrogen dioxide and water. Nitric acid - concentrated solution.Ebook Effect of Sulphuric Ebook Concentration on the Removal of Reactive Aluminium from South African Coal Fly Ash Mathibela E.

Aphane 1,2, Elizabet M. van der Merwe 2, Frédéric J. Doucet 3 and Leslie Petrik 4 1 Department of Chemistry, PO BoxUNISA, Pretoria,South Africa; 2 University of Pretoria, Chemistry Department, Lynnwood Road, Pretoria, ;File Size: KB.