Aqueous reduction of chalcopyrite concentrate with metals. by M.B. Shirts [and others]

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U.S. Bureau of Mines , Washington
The Physical Object
Pagination18 p.
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Open LibraryOL22017491M

In other words, galvanic conversion of chalcopyrite can be used as an activation pretreatment in the hydrometallurgical processing of chalcopyrite concentrate. Treatment of chalcopyrite concentrates Low temperature aqueous activation of chalcopyrite has also been attempted by adding finely divided metals like Cu, Fe, Pb etc.

[].Cited by:   Quantitative and rapid removal of copper from a solution containing 3 g/L Cu and 5% H 2 SO 4 in the presence of sulfite and a chalcopyrite concentrate was demonstrated by a series of tests in mL conical flasks in a thermostatted orbital shaker. As shown in Fig. 1, the proportion of copper deposited was strongly correlated with the concentration of sodium by: 2.

The aqueous oxidation of chalcopyrite flotation concentrate is faster in HC1 than in H2SO4. Under certain conditions, FeCl2 formed during reaction undergoes oxidation and hydrolysis (or vice versa. The aqueous oxidation of chalcopyrite flotation concentrate is faster in HC1 than in H2SO4.

Details Aqueous reduction of chalcopyrite concentrate with metals. by M.B. Shirts [and others] FB2

Under certain conditions, FeCl2 formed during reaction undergoes oxidation and hydrolysis (or vice versa) yielding α-Fe2O3 or β-FeOOH depending on the initial acidity, O2 pressure, and temperature. A small fraction of sulfur oxidizes to soluble SO 4 2- and a part precipitates as Fe(OH) by: Once the chalcopyrite concentrate containing co pper and other metals o f value (such as gold, silve r) has been p ro- duced, the ne xt step is to remove i mpurity ele ment.

Table of ContentsExperimental Set-UpResults and DiscussionLeaching Tests with Ammonia Molybdenite and chalcopyrite are two often-associated minerals. In Quebec, the Gaspe Copper Company, a subsidiary of the Noranda group, currently operates a molybdenite flotation circuit to recover a one percent trace of this mineral in the chalcopyrite concentrate.

The low levels of molybdenite preclude. With regard to Eq.(1), the extent of reaction is estimated depending on the amount of iron released from chalcopyrite, through analysis of dissolved iron in reducing conditions, only the iron component of chalcopyrite dissolves.

However, because iron is the reductant, it is susceptible to dissolution in acidic media according to the following reaction: (2) Fe (s) +2 H (aq.

Chalcopyrite concentrate is typically obtained from the multi-stage flotation of a sulfide ore consisting of fine grains of chalcopyrite dispersed in a matrix of various sulfide minerals and quartz.

Thus, the liberation of the individual minerals occurs after fine grinding, typically to sizes below 75 μm (Baláž et al., ). 1. Introduction Background to chalcopyrite leaching. The objective of this research was to evaluate a proposed conceptual flowsheet for the leaching of chalcopyrite using aqueous glycine in an alkaline environment with a suitable oxidant, and to identify potentially feasible routes for copper recovery from such a pregnant leach solution with concomitant reagent regeneration.

Shirts M. B., et al., Aqueous Reduction of Chalcopyrite Concentrate with Metals, US Bureau of Mines RI, Google Scholar Hackl R., et al., Reverse Leaching of Chalcopyrite, in: Proceedings of International Conference Copper ′87, Viña.

In this paper, the effect of the cupric and chloride ions concentrations on copper dissolution from chalcopyrite concentrate was studied in acidified media. Variables included three different concentrations of Cu2+ (,and g L−1), four different concentrations of Cl− (0, 5, 7, and 10 g L−1), two different pH values of 1 and 2, and a constant temperature of 60 °C.

Results. Chalcopyrite from Messina, Transvaal was used forthe bulk of the work. This material was ground, sized and subjected to magnetic and heavy-media treatment to pro-duce a high-grade chalcopyrite concentrate.

Examination of the concentrate by X-ray dif-fraction analysis using a Guinier-de Wolff came. Bench-scale studies were made on a reductive hydrometallurgical procedure to convert chalcopyrite flotation concentrate to copper metal or a readily leachable sulfide. Reductive conversion of chalcopyrite and dissolution of iron and sulfur were accomplished in hydrochloric or sulfuric acid solution by the addition of metallic copper, iron, or lead.

terms of the chalcopyrite disease are not of this origin. {nl-oN TExruRE Now, let us return to the description of the disease. We refer to the texture shown in Figures 2a alrd 2b as "wa-termelon," with a "rind" of fine chalcopyrite enclosing a core of colorless sphalerite containing a central zone of coarse, vermicular "seeds" of.

Chalcopyrite may also alter to iron-bearing minerals because it contains iron as much as copper. Its chemical formula is simple as is common among the sulfide mineral group: CuFeS 2.

Pyrite is paler and greenish yellow on the left. Chalcopyrite next to it has much more intense yellow color.

Reddish patch on the left is an igneous rock monzonite. For chalcopyrite oxidized in aqueous solution, the Cu and Fe L-edge spectra show that the surface oxidation layer is copper deficient. As the pH increases, O K-edge spectra reveal a change in the.

thermodynamic stability of Cu metal and chalcopyrite in an aqueous fluid in equilibrium with Fe S. The HSC Chemistry equilibrium composition module was used to determine the stable species at tem-perature steps between and K. Pressure. Once the chalcopyrite concentrate containing copper and other metals of value (such as gold, silver) has been produced, the next step is to remove impurity element.

In older processes, the concentrate containing between 56 - 10 percent water, is first roasted in a cylindrical, refractory lined furnace of either the hearth or fluidized bed type. Chalcopyrite CuFeS2 c Mineral Data Publishing, version 1 Crystal Data: Tetragonal.

Point Group: 42m. Equant, tetrahedral-shaped crystals, may be modified by scalenohedral faces, to as large as 10 cm.

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Sphenoidal faces {} typically large, dull in luster and striated k []; {} faces are small and bright. Commonly massive. About 3/4 th of Copper (Cu) produced in the world has come from Chalcopyrite (CuFeS 2), but it is the lowest standard ore of Copper.

The method used to extract copper from its ores depends on the nature of the ore. Sulphide ores such as chalcopyrite are converted to copper by a different method from silicate, carbonate or sulphate ores. Chalcopyrite Meanings, Zodiacs, Planets, Elements, Colors, Chakras, and more. Chalcopyrite is a copper iron sulfide mineral that was first found in by J.F Henckel.

It was named from the Greek word for “Copper” and “Brass”, and can most notably be seen as shades of yellow, green and grey. When Chalcopyrite is exposed to acid, its color palette changes to deep purple, blues, violets. A chalcopyrite concentrate containing around 60% chalcopyrite and analyzing around 28% copper was leached under reducing conditions using metallic iron.

Various parameters were studied to understand their effect on leaching kinetics, including: temperature, particle size, agitation, acid concentration, molar ratios, and others.

Froth collection and dewatering of chalcopyrite mixed with (Fe,Ni, Ag, Au) is: Iron combines with the Flux to form. slag, which is skimmed off the surface of the molten material.

Sulfur in the concentrate combined with oxygen to form. sulfur dioxide - exhausted and further treated to produce sulphuric acid treats copper with various. oxide. Work by Razouk and others to study the oxidation of chalcopyrite by TGA was also reviewed (2).

Razouk pro­ posed a mechanism for the temperature range of 0 to C, suggesting that chalcopyrite oxidized to form ferric sul­ fate and cuprous sulfide.

Fig. Correlation of adsorption and flotation-varying reagent concentration, Chalcopyrite-Cupferron system. Vertical axis indicates wt % floated. suggested by Nagaraj and Somasundaran (). It may be recognised that this chelate need not be identical with the metal chelate formed inthe aqueous solutions.

Chalcopyrite (CuFeS 2) comprises nearly 70% of the Earth’s copper resources, and is the most important and abundant cupriferous mineral [1,2].Chalcopyrite is typically processed pyrometallurgically subsequent to its separation from gangue minerals by flotation which is a water-intensive process based on the different natural or induced surface properties of the valuable and gangue minerals.

the Küre chalcopyrite concentrate. Firstly, chemical composition of the chalcopyrite concentrate was determined, as given in Table 2. For the chemical analyses of the chalcopyrite concentrate, samples were dissolved by using microwave ­assisted acid dissolution technique. Chalcopyrite Properties.

Chalcopyrite is also known as Peacock Ore because of its lovely iridescent green, blue, pink, purple, and gold colors that resemble the feathers of a peacock.

Description Aqueous reduction of chalcopyrite concentrate with metals. by M.B. Shirts [and others] PDF

The colors of Chalcopyrite come from the oxidation of copper and iron in the crystal. It’s a common mineral that can be found in most sulfide deposits. Chalcopyrite is an ore with the composition CuFeS2. What is the percentage of copper in a grams sample of this ore. The first of these is up to V overpotential, and is characterized by an initial oxidation process shown in Figs.

4 and 5d, at potential values where oxidation of intermediate species of oxides. Duration of concentrate holding at optimum temperature depends on the furnace type and air delivery pattern in the reaction zone. References 1. N. I. Utkin Non-Ferrous Metals Manufacture, second edition, Moscow, Intermet Engineering,p.* 2.

G. B. Naumov, B. N. Ryzhenko, I. L. Hodakovskiy. Reference Book of Thermodynamic.Materials: A dried and caked chalcopyrite concentrate, analyzing % Cu% Fe and % S, was first ground to um ( mesh) and agglomerated into micro-pellets by adding an optimum amount of moisture together with 2% by weight of molasses as a binder, stirring in a bowl mixer, and then drying in an oven held at °C overnight.Chalcopyrite has a golden yellow color, which often resembles Gold.

However, its physical properties such as streak and tenacity are very different from Gold and can easily distinguish it. Chalcopyrite is a beautiful mineral, with good crystals being fairly common. It is also readily available, with quality specimens being surprisingly affordable.