2 edition of Effect of nonionic surfactants on chalcopyrite leaching under dump chemical conditions. found in the catalog.
Effect of nonionic surfactants on chalcopyrite leaching under dump chemical conditions.
S. P. Sandoval
by U.S. Dept. of the Interior, Bureau of Mines in Washington, D.C. (2401 E St., N.W., MS #9800, Washington 20241-0001)
Written in English
|Statement||by S.P. Sandoval, D.L. Pool, and L.E. Schultze.|
|Series||Report of investigations -- 9381., Report of investigations (United States. Bureau of Mines) -- 9381.|
|Contributions||Pool, D. L., Schultze, L. E., United States. Bureau of Mines.|
|The Physical Object|
|Pagination||10 p. :|
|Number of Pages||10|
showed that %Cu extraction is probable under optimum leaching conditions. References PadillaR, PavezP, RuizMC. Kinetics of copper dissolution from sulfidized chalcopyrite at high pressure in H 2SO 4-O 2. Hydrometallurgy ; – Sokic MD, MarkovicB, Zivkovic D. Kinetics of chalcopyrite leaching by sodium nitrate in sulphuric. This paper presents the effect of mineralization on chalcopyrite chemical leaching in very simple H2SO4 solution systems at pH , with 5 % chalcopyrite concentrate at 65 °C. The copper extractions after 12 days leaching of marine volcanic and porphyry chalcopyrite were and %, respectively. It was found that sulphur element formed on the surface of two samples as a result of .
At G/l fe3+ and below, the addition of the surfactant produced as much as a pct decrease in leaching. Each of the nonionic surfactants studied was found to be heavily adsorbed by a typical chalcopyrite ore, which poses a serious barrier to the application of nonionic surfactants in an actual chalcopyrite dump.". proposed that sodium chloride has a positive effect on chalcopyrite dissolution increasing copper extraction. Aiming to bring further insight into this topic, the present work seeks to evaluate the influence of sodium chloride on the leaching of chalcopyrite focusing on surface area and porosity of the reaction products formed during leaching.
Chalcopyrite concentrate and mixtures of pyrite/chalcopyrite were leached in H2SO4-NaCl-O2 solutions to assess the effect of pyrite on the chalcopyrite dissolution rate in this media. The results showed that the addition of pyrite increases the dissolution rate of chalcopyrite at short leaching times but the catalytic effect of pyrite decreases as the reaction progresses. "Several researchers have shown that the surface of chalcopyrite becomes hydrophobic under oxidizing conditions. Because dissolution of copper from chalcopyrite in dump leaching occurs under oxidizing conditions, the U.S. Bureau of Mines studied the effect of surfactants on chalcopyrite leaching under dump chemical conditions.
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Effect of nonionic surfactants on chalcopyrite leaching under dump chemical conditions. Washington, D.C.: U.S. Dept. of the Interior, Bureau of Mines, (OCoLC) Get this from a library. Effect of nonionic surfactants on chalcopyrite leaching under dump chemical conditions.
Part 2. [S P Sandoval; D L Pool; L E Schultze; United States. Bureau of Mines.]. On the basis of this hypothesis, the U.S. Bureau of Mines investigated the effect of nonionic surfactants on chalcopyrite leaching under conditions of temperature, pH, oxidant, and oxidant concentration that approximate those found in dump leaching.
Dump leaching is a method to treat low-grade ore that is not suitable for treatment by flotation. Chalcopyrite is the richest copper sulfide mineral in the world, but it is also the most resistant to biohydrometallurgical processing.
To promote the bioleaching of chalcopyrite, a nonionic surfactant, t-octyl phenoxy polyethoxy ethanol (Triton X), was employed in this paper. Action of Triton X in chalcopyrite leaching using Acidithiobacillus ferrooxidans was explored in shake by: 8.
Effect of nonionic surfactants on chalcopyrite leaching under dump chemical conditions, part 2. by S.P. Sandoval - Saturday, Ap AM Social models of teaching.
Under these conditions the surfactant was successful in dispersing liquid sulfur and it effected a modest increase in copper extraction over that obtained at °C, but only after prolonged retention times (6 hours).
It was found that chalcopyrite leached slowly even if molten sulfur was prevented from wetting the mineral surfaces. Abstract: Chalcopyrite leaching in acidic chloride solution with-out sulphates.
The effect of dissolved oxygen and ferrous/ferric/cu-pric ions in solution on the leaching behavior of chalcopyrite and the phenomenology of the passivating layer formation on the chalcopyrite surface in an aqueous acidic chlorinated medium with dissolved oxy.
Clouding phenomenon generally occurs with nonionic surfactants when the temperature of the system is raised to a certain value. This critical temperature is termed the cloud point (CP).
The aqueous solutions of nonionic surfactants show complex phase behaviour including liquid-liquid phase separation at this temperature. surfactants: ionic and nonionic. Ionic surfactants can be further divided into three subgroups: anionic, cationic and zwitterionic.
Anionic surfactants are negatively charged and their hydrophilic part very often consists of a sulphate or phosphate group. In contrast, the cationic surfactants are positively charged, frequently with a nitrogen-based.
Bio-surfactants refer to culturing the microorganism under certain conditions, dissolving out surface active metabolites in its metabolism. Depending on the chemical structure, biological surfactants can be divided into single sugar esters, polysaccharides esters, proteins and phospholipid esters.
leaching product on the mineral surface, as confirmed using XRD and SEM/EDX. The semi-empirical equation explaining the reaction rate under the present conditions was expressed as follows: X X t C e T 0,83 0 NaNO 4 3 2 2 1 10 3 2 1 J.
Keywords: chalcopyrite, pressure leaching, nitrogen species, kinetics Introduction. Book. Jun ; Salvador A M Sandoval. Effect of Nonionic Surfactants on Chalcopyrite Leaching Under Dump Chemical Conditions. Article. Full-text available. The catalytic effect of silver at 35 °C was dependent on the [Fe 3+]/[Fe 2+] ratio present in solution (Fig.
1a and c), so that the copper dissolution rate during catalyzed chalcopyrite chemical leaching increased with increasing initial redox potential. In addition, a comparison with the results recorded at mV in the absence of silver (Córdoba, et al., in press, part II) clearly shows a.
This paper reports a study on the effect of addition of chloride ion in the agglomeration and the effect of curing time on the overall leaching process of chalcopyrite ore.
The work involved leaching tests carried out in columns containing kg of agglomerated ore irrigated with raffinate solution under ambient conditions. The effect of surfactant addition on ferrous ion oxidation and microbially-mediated leaching of chalcopyrite by a mixed thermophilic microbial culture was investigated using five non-ionic.
When surfactant leaching occurs, flush with clean water immediately, before the stains have sufficient time to set up or harden. Light scrubbing with a soft brush is acceptable. If stains cannot be removed in this manner, then repainting will be necessary during more favorable weather conditions. The rate of dissolution of a chalcopyrite concentrate was measured in ammoniacal solutions under oxygen pressure for conditions when chemical reaction rate controlled.
Temperatures from 50°‐95°C, oxygen pressures to kPa and ammonia concentrations from to mol/l were investigated.
An electrochemical surface reaction model in which. 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 but report low recovery +/% TCu over several years and the rate is around % per month. Effect of Potassium Acetate Concentration Potassium ions form complexes with nonionic surfactants- , therefore, the concentration of potassium ion was investigated in our systems.
Data in ure 2 show that the absorbance reached a constant value when 7 Fig Table 1. Effect of vessel materials. Vessel material Absorbance. The mass balance showed that 98% of copper was extracted from the chalcopyrite concentrate in 3 h under the following experimental conditions: g/L of initial sulfuric acid concentration, temperature of °C, oxygen pressure of 1 kg/cm2, solid concentration of g/L and particle size of − + 75 μm.
the leaching mechanisms of chalcopyrite. In addition, the effects of different variables such as stirring speed, temperature, particle size, pyrite to chalcopyrite (Py/Cp) ratio, and solution potential on the reaction rate were also investigated. Table 1. Chalcopyrite leaching .Lankem offer a wide range on nonionic surfactants that range from Alcohol ethoxylates, Castor ethoxylates, Oleic acid ethoxylates, Tallow amine ethoxylates coconut diethanolamides, amine oxides, soribitan ester ethoxylates and many more.The chalcopyrite leaching residue used in this study was produced from a chalcopyrite concentrate leaching similar to the leaching circuit of the Cuprex process .
The leaching conditions are: two-stage countercurrent leaching with 6 hours of retention time on each stage, leaching temperature of 95oC, and moles per liter of ferric.