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Sunday, April 19, 2020 | History

2 edition of Influence of chelating reagents on leaching of copper ore found in the catalog.

Influence of chelating reagents on leaching of copper ore

L. A. Haas

Influence of chelating reagents on leaching of copper ore

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Published by U.S. Dept. of the Interior, Bureau of Mines in Pittsburgh, Pa .
Written in English

    Subjects:
  • Copper -- Metallurgy.,
  • Leaching.,
  • Chelates.

  • Edition Notes

    Bibliography: p. 11-12.

    Statementby Larry A. Haas and Terry L. Hebble.
    SeriesReport of investigations / U.S. Dept. of the Interior, Bureau of Mines ;, 8965., Report of investigations (United States. Bureau of Mines) ;, 8965.
    ContributionsHebble, T. L.
    Classifications
    LC ClassificationsTN23 .U43 no. 8965, TN780 .U43 no. 8965
    The Physical Object
    Pagination12 p. :
    Number of Pages12
    ID Numbers
    Open LibraryOL2663005M
    LC Control Number85600013

    Short Course Copper Oxide Ore Heap Leaching Testwork and Scale-Up April ALTA Metallurgical Services, Melbourne, Australia. Red mud is a highly alkaline (pH >12) waste product from bauxite ore processing. The red mud spill at Ajka, Hungary, in released 1 million m 3 of caustic red mud into the surrounding area with devastating results. Aerobic and anaerobic batch experiments and solid phase extraction techniques were used to assess the impact of red mud addition on the mobility of Cu and Ni in soils from near Cited by: D-penicillamine (D-pen), another copper-chelating agent, can generate intracellular reactive oxygen species (ROS) and be cytotoxic to human leukemia and breast cancer cells. 12 A study showed that copper chelation using tetrathiomolybdate improves cisplatin efficacy in a mouse model of cervical cancer, enhances cisplatin killing of human. 4b. Purification of Copper by Electrolysis (extraction from ore above). The impure copper from a smelter is cast into a block to form the positive cathode is made of previously purified are dipped into an electrolyte of copper(II) sulphate solution.; When the d.c electrical current is passed through the solution electrolysis takes place.


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Influence of chelating reagents on leaching of copper ore by L. A. Haas Download PDF EPUB FB2

Additional Physical Format: Online version: Haas, L.A. (Larry A.). Influence of chelating reagents on leaching of copper ore. Pittsburgh, Pa.: U.S. Dept. of the. The application of new chelating reagents on the flotation of copper minerals has been paid much attention in recent years.

These collectors have successfully extracted the copper minerals from the low-grade refractory ores, and one of the most important collectors is the alkylhydroxamate-based chelating reagent which shows the excellent flotation performance to the copper oxide by: 1. PREPARATION OF THE COPPER ORE.

This study is limited in general to percolation leaching as it is the most widely used method to give proper contact of solvent with the ore to effect extraction of the copper. One of the important factors in percolation leaching is the size reduction necessary for copper recovery within reasonable time limits.

The influence of the concentration of purine (PU) and adenine (AD) on the corrosion and spontaneous dissolution of copper in M NaNO3 solutions of pH was studied. "Significant amounts of cobalt, a strategic and critical metal, are present in readily accessible spent copper leach solutions; for example, recovery of cobalt at two major U.S.

copper operations could produce about 1, lb CO annually, about 13 Cited by: 1. Nitrilotriacetate (nta 3−) is a powerful tetradentate chelating agent with log β NiL = The successive substitution of carboxylate by phosphonate group results in three ligands N(CH 2 CO 2 H) 3−r (CH 2 PO 3) r with r = 0–3.The high pK values for deprotonation of these ligands give rise to many protonated species.

The effect of temperature on the rate of copper dissolution from CuO when leached in the three inorganic acids was investigated over a temperature range of 30–50 °C at acid concentration of M, stirring speed of rpm and l/s = 10 ml/ 5 shows that temperature has a significant effect on the acceleration of copper dissolution with HNO 3 followed by H 2 SO by: A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text.

Copper Agitated Leaching and cementation process of copper problem: The treatment of copper ores, both oxides and sulfides by means of flotation, hydrometallurgy or other processes has been well established for many years.

Flotation has been applied generally to the treatment of sulfide ores, both in small and large scale operations. practiced on oxide ore that was too low-grade for vat leaching, or low grade sulphide ore that had to be mined in order to expose the underlying high grade sulfide ore.

Copper recovered from leaching low grade copper ores was considered a bonus and little effort had been made to fully understand the leaching process or to maximize copper Size: KB. Copper ore is classified into three groups; primary copper sulfide, copper oxide and secondary copper sulfide.

Leaching copper from primary copper sulfide, such as chalcopyrite, with sulfuric acid takes longer time than from copper oxide and secondary copper sulfide.

As such, an oxidant is required to extract copper from chalcopyrite. In this study, column leaching tests were carried out using Author: Tatsuya Shinkawa, Taro Kamiya, Kazuhiro Kojima, Tadashi Chida.

Abstract. Natural bioleaching has been taking place for almost as long as the history of the world, but it is only in the last few decades that we have realized that bioleaching is responsible for acid production in some mining wastes, and that this bacterial activity can be used to liberate some by: The Principles and Practice of Leaching focuses on advances in the leaching of metals from various ores and concentrates.

The articles presented in this volume represent thirteen countries scattered through five continents. This is a reflection of the international effort being expended to advance the theory and practice of leaching. The rate of leaching was found to be principally dependent upon the rate at which the leaching solution can penetrate the ore, since the solubilization of mn upon contact with so2 was observed to be rapid.

Influence of chelating reagents on leaching of copper ore Personal Author: Haas, L. (Larry A.); Hebble, T. (Terry L.); Cited by: 6. •Soluble Copper and Zinc –Samples are extracted in pH buffer solution (M 2,2 Bis(hydroxymethyl)-2,2’,2”-nitrilotriethanol (C8H19NO5) and hydrochloric acid).

–Liquid samples containing ammonium polyphosphate must be extracted in 10% disodium EDTA solution due to the strong complexing characteristics ofFile Size: KB.

low-grade ore (containing % Cu) were built and left for one to three years for “natu-ral” decomposition (SALKIELD, ). 20 to 25% of the copper left in the heaps were re-covered annually. It was calculated that ap-proximatelyt of rough ore could be treated in Although industrial leaching operations were conducted at the Cited by:   Essentially complete recovery of copper from an oxide ore was obtained in a leaching operation by the U.S.

Bureau of Mines using ethylenediaminetetra-acetic acid (EDTA) as a chelative leachant. The EDTA was most effective in the form of a trisodium salt. Copper can be recovered as metal from leach solutions by reducing agents such as hydrogen, HCHO, and by: 1. Influence of chelating reagents on leaching of copper ore [microform] / by Larry A.

Haas and Terry L. H Dispersion-selective flocculation-desliming characteristics of oxidized taconites [microform] / by R.E. Utilization of simulated coal gases for reducing iron oxide pellets [microform] / by Larry A.

Haas, Joh. The influence of the concentration of nitrite on copper recovery was investigated using an electrolyte containing various initial sodium nitrite concentrations in the range of M– M at °C.

The results are plotted in Fig. Although the recovery-time curves overlapped during the first 15 min, the reaction rates were enhanced after.

An important operational and environmental concern associated with in situ leaching activity is the balance between solution injection and recovery. Solution balance is an important indicator of the capability of a particular in situ hydrologic design to efficiently and effectively control and distribute leach solution within the target ore zone.

Copper/Molybdenum Ore The figure above is a simplified flow sheet showing the basic steps involved in a copper mill producing the byproduct molybdenum.

The crushed copper ore (containing, for example, % Cu and % Mo) is fed to the grinding circuit where water. ri / influence on an organic polymer in ball-mill grinding of quartz dolomite, and copper ore, pb, $ 20 ri / influence of chelating reagents on leaching of copper ore, pb, $ 8 ri / using solvent-impregnated carbon to recover copper from oxidized mill tailings, pb, $ The changes in copper content in the ore with the time of exploitation at the RTB mines [9] Oxide copper ore, mixed oxide-sulphide ores and low-grade copper sulphide ore, which, for economic reasons, cannot be enriched by flotation, may be processed by leaching methods.

Agents for leaching copperCited by: 3. The native culture of mesophilic bacteria predominantly xidans iso isolated from the source mine water show good potential for the bio-leaching of copper from the low grade ore. A bio-recovery of 75% copper in leach liquor is achieved with the ore adapted culture at pH with the particles of.

Chelation (US: / k iː ˈ l eɪ ʃ ən /, UK: / tʃ ɪ-/) is a type of bonding of ions and molecules to metal ions. It involves the formation or presence of two or more separate coordinate bonds between a polydentate (multiple bonded) ligand and a single central atom.

These ligands are called chelants, chelators, chelating agents, or sequestering agents. A lixivant (leaching solution) is selected for use in leaching Cu ions from the ore. Common reagents are weak acids e.g.

H 2 SO 4, H 2 SO 4 + Fe 2 (SO 4) 3, acidic chloride solutions e.g. FeCl 2, ammonium chloride and ammonium salt compositions. The ore used in the test work is a copper-cobalt oxide ore from the Katanga Province in the DRC.

The ore was crushed and milled to 80% – μm. The composition of the ore is given in Table II. Reagents The main reagents included analytical grade sulphuric acid (98%) as a.

Non-oxidative leaching of black shale copper ore from Lubin mine particles would be the only way to enhance metal recovery. However, it appears to be either inefficient or very costly by physical methods in the existing milling circuits. Consequently, the hydrophilic gangue-sulphide intergrowths greatly reduce both.

The chelating ligands can **donate electrons for coordination with the metal. Depending on the number of metal-ligand bonds, the complex may be referred to as mono- bi- or polydentate. -Some are nonspecific and may also chelate essential metals such as calcium and zinc (this problem is minimized by administration of the essential metals along.

The leaching reagents during their journey downwards with the flowing solution first have to diffuse into the ore particles and react with the metal bearing minerals in the ore, and then the resultant metallic complexes have to diffuse back into the solution (Sánchez-Chacón and Lapidus, ).

This review has as its underlying premise the need to become proficient in delivering a suite of element or metal products from polymetallic ores to avoid the predicted exhaustion of key metals in demand in technological societies.

Many technologies, proven or still to be developed, will assist in meeting the demands of the next generation for trace and rare metals, potentially including the Cited by: used in heap or run-of-mine stock-pile leaching of ore materials and recovery of desired metal values through SX-EW.

This acid supply for use in heap leaching of copper, and other base metals can be obtained from different sources [United States Patent (), no. US / and /]. However, there are significant costs. Leaching kinetics of low-grade copper ore containing calcium-magnesium carbonate in ammonia-ammonium sulfate solution with persulfate LIU Zhi-xiong1, 2, YIN Zhou-lan 1, HU Hui-ping1, CHEN Qi-yuan1 1.

School of Chemistry and Chemical Engineering, Central. Copper oxide ore deposits in the Central African copper-belt region such as Katanga province of the Republic of Congo contain high levels of well-oxidised copper (% Cu) and cobalt (% Co) [1,2].

The lack of response of Cu-Co oxide minerals during flotation [3] implies that heap or vat leaching should be considered for these ores. Reagents Wash Final Water Residue Raffinate Bleed Copper Cathode Gold and Silver Copper Leaching S/L Separation Copper SX-EW Precious Metal Recovery Copper Ore or Concentrate.

Leaching of High Grade Ores and Concentrates • Developments are primarily related to leaching of high grade chalcocite – pyrite ores and leaching of chalcopyrite File Size: 2MB. Abstract. Bibliography: leaves This study examines the role complexing agents play in pentlandite-pyroxene flotation and focuses on the surface chemistry and interaction between valuable and gangue minerals as well as the interaction of complexing agents and reagents (xanthate, copper sulphate) in the system at pH : Natalie Jean Shackleton.

The leaching temperature also plays a significant role in metals extraction. Fig.4 shows the effect of leaching temperature on metals extraction with acid addition of kg/t, leaching time of 1 h and L/S ratio of It can be seen from Fig.4 that the extractions of.

Mulligan CN, Galvez-Cloutier R, Renaud N () Biological leaching of copper mine residues by Aspergillus niger. Process Metallurgy – [ Links ] Mulligan CN, Kamali M () Bioleaching of copper and other metals from low-grade oxidized mining ores by Aspergillus niger.

J Chem Technol Biotechnol – [ Links ]Cited by: Ethylenediaminetetraacetic acid (EDTA), also known by several other names, is a chemical used for both industrial and medical was synthesized for the first time in by Ferdinand Münz.

It is an aminopolycarboxylic acid and a colorless, water-soluble solid. Its conjugate base is is widely used to dissolve iations: EDTA, H₄EDTA. With increased demand for copper, rich copper deposits are rapidly decreasing, and people are now focusing attention on copper recovery from low-grade copper ore or/and secondary copper resources [1,2].The hydrometallurgical technique involving crushing, leaching, solvent extraction (SX), and electrowinning is being applied to recover copper from these low-grade copper resources [3,4].Cited by: 2.

Copper chelating agents are the first-line therapy for WD (Table 3). [49,50,51,52] In the initial phase of treatment, toxic levels of copper are controlled, and dietary copper is restricted.Copper induces--and copper chelation by tetrathiomolybdate inhibits--endothelial activation in vitro.

Wei H, Zhang WJ, Leboeuf R, Frei B. Endothelial activation with increased expression of cellular adhesion molecules and chemokines critically contributes to vascular inflammation and by: 9.Copper Chelation Chemistry and its Role in Copper Radiopharmaceuticals Current Pharmaceutical Design,Vol. 13, No.

1 5 are readily prepared using relatively soft polarizable ligands like thioethers, phosphines, nitriles, isonitriles, iodide, cya-nide and thiolates. A broad range of .