Exploiting the Influence of Oxidization on Ultra-Fine Copper and Nickel Sulfide Containing Pt-Pd in Yunnan Mine

2013 ◽  
Vol 712-715 ◽  
pp. 760-763
Author(s):  
Min Tang ◽  
Bao Liang Ge ◽  
Shu Ming Wen
Keyword(s):  
Sodium Silicate ◽  
Nickel Sulfide ◽  
Low Grade ◽  
Settling Rate ◽  
Mineral Surface ◽  
Butyl Xanthate ◽  
Oxidation Of Sulfides ◽  
Sulfide Flotation ◽  
Fine Copper ◽  
Fine Nickel

It is known that oxidation is one of the most common ways for penlandite to be introducted into tailing during traditional coarse-particle sulfide flotation. However, it could become much more complicated and challenging problems for the low-grade, fine-disseminated Cu-Ni sulfides containing Pt and Pd in Yunnan Mine, accompanied with more than 75% of the content of MgO in the ore sample is. Direct flotation tests had been conducted to extract the metallic values as much as possible by adding traditional depressants and collectors, such as carboxylmethyl cellulose, starch, sodium silicate, butyl xanthate, (BX), butyl ammonium dithophosphate (BA) and etc., the relatively satisfied recoveries of Cu, Ni, Pt and Pd in the concentrate from bench flotation tests were obtained, however, more than 30% of metallic values still lost in the slime. In this study, bench flotation tests for the ore sample fromYunnan Mine, micro-flotation tests of serpentines and pentlandite from Jinchuan Mine and their settling rate tests were conducted to figure out how the oxidation influence the recovery of the ultra-fine nickel sulfide. All the tests results pointed to the presence of over-oxidation on the ultra-fine nickel sulfide surface and lead to the loss of Ni containing Pt and Pd in the slime tailing. Some methods which tried to slow the speed of oxidation on mineral surface during grinding and flotation were introduced in order to recover the values before over-oxidation of sulfides; however, the slime coating of serpentines also may play an important role in disturbing the floatability of ultra-fine sulfide.

Scanning Electron Microscope Study of Bacteria on Mineral Surfaces

1976 ◽  
Vol 34 ◽  
pp. 130-131
Author(s):  
V.K. Berry
Keyword(s):  
Oxidation Reaction ◽  
Electron Microscope Study ◽  
Elemental Sulfur ◽  
Thiobacillus Ferrooxidans ◽  
Physical Contact ◽  
Metal Sulfides ◽  
Low Grade ◽  
Mineral Surfaces ◽  
Mineral Surface ◽  
Scanning Electron Microscope Study

There are two strains of bacteria viz. Thiobacillus thiooxidansand Thiobacillus ferrooxidanswidely mentioned to play an important role in the leaching process of low-grade ores. Another strain used in this study is a thermophile and is designated Caldariella .These microorganisms are acidophilic chemosynthetic aerobic autotrophs and are capable of oxidizing many metal sulfides and elemental sulfur to sulfates and Fe2+ to Fe3+. The necessity of physical contact or attachment by bacteria to mineral surfaces during oxidation reaction has not been fairly established so far. Temple and Koehler reported that during oxidation of marcasite T. thiooxidanswere found concentrated on mineral surface. Schaeffer, et al. demonstrated that physical contact or attachment is essential for oxidation of sulfur.

Leaching of a low-grade, copper–nickel sulfide ore

2009 ◽  
Vol 98 (1-2) ◽  
pp. 66-72 ◽  
Author(s):  
M. Maley ◽  
W. van Bronswijk ◽  
H.R. Watling
Keyword(s):  
Nickel Sulfide ◽  
Low Grade ◽  
Copper Nickel ◽  
Sulfide Ore

scholarly journals Beneficiation research on a low grade linnaeite ore with hema-tite-pyrite type

2019 ◽  
Vol 136 ◽  
pp. 02008
Author(s):  
Xinfang Zhang ◽  
Qinqin Wang ◽  
Chengdong Wang ◽  
Lang Zhu ◽  
Shujie Shi ◽  
...  
Keyword(s):  
Copper Sulfate ◽  
Recovery Rate ◽  
Closed Circuit ◽  
Low Grade ◽  
Butyl Xanthate ◽  
Ethyl Xanthate ◽  
Type Complex

Mineralogy and separation experiments were carried out for a low-grade linnaeite ore (0.052%), which belonged to limonite-hematite-pyrite type complex mineral. Under the grinding fineness of 80% -0.074 mm, linnaeite concentrate which contained cobalt grade of 0.51%, recovery rate of 80.99%, sulfur grade of 23.79%, recovery of 88.03% was obtained by closed-circuit processes of one roughing, two scaenging and one cleaning, which used sulfate acid (4500 g/t) and copper sulfate (300 g/t) as activator, so-dium silicate (1000 g/t) and CMC (30 g/t) as inhibitor, ethyl xanthate（100 g/t）and butyl xanthate (100 g/t) as collector, 2# oil (40 g/t) as forther in roughing, no agent in cleaing and first scavenging, used ethyl xan-thate（50 g/t）and butyl xanthate (50 g/t) as collector, 2# oil (20 g/t) as forther in second scavenging.

scholarly journals Recovering Cobalt and Sulfur in Low Grade Cobalt-Bearing V–Ti Magnetite Tailings Using Flotation Process

Processes ◽  
2019 ◽  
Vol 7 (8) ◽  
pp. 536 ◽  
Author(s):  
Xiao ◽  
Zhang
Keyword(s):  
Copper Sulfate ◽  
Metal Sulfide ◽  
Raw Material ◽  
Low Grade ◽  
Sulfur Recovery ◽  
Butyl Xanthate ◽  
Flotation Process ◽  
Pine Oil ◽  
Cobalt Recovery ◽  
Flotation Concentration

There is 0.032% cobalt and 0.56% sulfur in the cobalt-bearing V–Ti tailings in the Panxi Region, with the metal sulfide minerals mainly including FeS2, Fe1−xS, Co3S4, and (Fe,Co)S2, and the gangue minerals mainly including aluminosilicate minerals. The flotation process was used to recover cobalt and sulfur in the cobalt-bearing V–Ti tailings. The results showed that an optimized cobalt–sulfur concentrate with a cobalt grade of 2.08%, sulfur content of 36.12%, sulfur recovery of 85.79%, and cobalt recovery and 84.77% were obtained by flotation process of one roughing, three sweeping, and three cleaning under roughing conditions, which employed pulp pH of 8, grinding fineness of < 0.074 mm occupying 80%, flotation concentration of 30%, and dosages of butyl xanthate, copper sulfate, and pine oil of 100 g/t, 30 g/t, and 20 g/t, respectively. Optimized one sweeping, two sweeping, and three sweeping conditions used a pulp pH of 9, and dosages of butyl xanthate, copper sulfate, and pine oil of 50 g/t, 15 g/t, 10 g/t; 25 g/t, 7.5 g/t, 5 g/t; 20 g/t, 5 g/t, 5 g/t, respectively. Optimized one cleaning, two cleaning, and three cleaning condition dosages of sodium silicate of 200 g/t, 100 g/t, 50 g/t, respectively. Study of analysis and characterization of cobalt–sulfur concentrate by X-ray diffraction (XRD), automatic mineral analyzer (MLA), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS) showed that the main minerals in cobalt–sulfur concentrate are FeS2, Co3S4 and (Fe,Co)S2, of which FeS2 and (Fe,Co)S2 accounted for 65.64% and Co3S4 for 22.64%. Gangue minerals accounted for 11.72%. The element Co in (Fe,Co)S2 is closely related to pyrite in the form of isomorphism, and the flotability difference between cobalt and pyrite is very small, which makes it difficult to separate cobalt and sulfur. Cobalt–sulfur concentrate can be used as raw material for further separation of cobalt and sulfur in smelting by pyrometallurgical or hydrometallurgical methods.

Investigation of Bioleaching of a Low Grade Nickel-Cobalt-Copper Sulfide Ore with High Magnesium as Olivine and Serpentine from Lao

2013 ◽  
Vol 825 ◽  
pp. 396-400 ◽  
Author(s):  
Bo Wei Chen ◽  
Liu Lu Cai ◽  
Biao Wu ◽  
Xue Liu ◽  
Jian Kang Wen
Keyword(s):  
Copper Sulfide ◽  
Nickel Sulfide ◽  
Low Grade ◽  
Nickel Cobalt ◽  
Nickel Silicate ◽  
Copper Leaching ◽  
Sulfide Ore ◽  
Initial Ph ◽  
Copper Sulfide Ore ◽  
Cobalt Copper

Shake flask bioleaching of a low-grade nickel-cobalt-copper sulfide ore from Lao was investigated to test the technical feasibility to recovery metals from this ore. The mineralogical results indicated that the valuable minerals were disseminated finely and the ore had a low content of sulfur and high content of iron and magnesium, which was very harmful for bioleaching. The effects of different parameters such as the amount of acid addition, inoculation volume, initial pH, temperature and leaching time on the bioleaching performance of the ore were evaluated after pre-leaching with dilute acid. The results showed that nickel, cobalt, copper leaching rates reached 81.61%, 80.75%, 70.97% at 33 °C and 83.40%, 82.13%, 70.34% at 45 °C. The mineralogical analysis of the leaching residues revealed that the leaching rate of nickel sulfide was more than 92% and the unleached nickel was mainly present as nickel silicate.

Research on the Flotation of Low Grade Copper-Nickle Ore

2014 ◽  
Vol 989-994 ◽  
pp. 1411-1414
Author(s):  
Zheng Bin Deng ◽  
Xiong Tong ◽  
Xiao Wang ◽  
Qing Yan Zhao ◽  
Xian Xie ◽  
...  
Keyword(s):  
Sodium Silicate ◽  
Low Grade ◽  
High Quality ◽  
Pine Oil

Effect of grinding fineness and inhibitors on mixed flotation of low copper and nickel were studied and a new nickel inhibitor YS was used in the process of separation of copper and nickel. The results indicated that the high-quality mixed concentrate with the recoveries of Cu and Ni 76% and 65.6% and the grade of Cu and Ni were 4.66% and 4.3%, respectively, was got under the condition of sodium silicate (200 g/t), CMC (200 g/t), copper sulphate200 g/t, amyl xanthate 100 g/t and pine oil 30 g/t with the grinding fineness of-0.074mm80%. Then, Qualified Cu concentrate with the grade26.65% and recovery 55.62%, Qualified Ni concentrate with the grade26.65% and recovery 55.62%, respectively, were got by using the new nickel inhibitor YS in the separation flotation of copper and nickel.

Characterization of the Quorum Sensing Regulon in Acidithiobacillus ferrooxidans

2013 ◽  
Vol 825 ◽  
pp. 129-132 ◽  
Author(s):  
Sigde Mamani ◽  
Yan Denis ◽  
Danielle Moinier ◽  
Mohamad Sabbah ◽  
Laurent Soulère ◽  
...  
Keyword(s):  
Cell Adhesion ◽  
Quorum Sensing ◽  
Acidithiobacillus Ferrooxidans ◽  
Operating Cost ◽  
Second Step ◽  
Low Grade ◽  
Mineral Surface ◽  
Homoserine Lactones ◽  
The Moment

Bioleaching is the solubilization of metals from ores by microorganisms. This process is more efficient than conventional methods in the metal recovery from low grade ores while decreasing the operating cost and the environmental impact. Among the bioleaching bacteria, the Gram-negative chemolithoautotrophic acidophilic Acidithiobacillus ferrooxidans has the ability to adhere to mineral surface and to form biofilm. The genes involved in the production of this biofilm are controlled by a cellular communication system called Quorum Sensing (QS). The QS occurs mainly through the production of acyl homoserine lactones (AHLs). A functional QS system has been identified in At. ferrooxidans with an acyl synthase (AfeI) and a transcriptional regulator (AfeR). Here, our purpose is to characterize the quorum sensing regulon and particularly the genes involved in biofilm formation in At. ferrooxidans. This has been done by cell adhesion experiments comparing At. ferrooxidans grown with or without Tetrazol, an AHL analogue that activates the cell adhesion to mineral surface. The second step has been to compare the expression of some genes predicted to be involved in the QS regulon in At. ferrooxidans grown in the presence/absence of Tetrazol using real-time PCR. These two different strategies are expected to give insight on the moment at which the At. ferrooxidans QS regulon is switched on. The formation of biofilm could improve the bioleaching operation and therefore the understanding of the QS regulon is of primordial importance.

Research on the Flotation Experiment of a Low-Grade Barite Ore in Myanmar

2014 ◽  
Vol 644-650 ◽  
pp. 5277-5280 ◽  
Author(s):  
Hong Jun Wang ◽  
Hui Xin Dai ◽  
Wei Lin Yang ◽  
Ting Ting Li
Keyword(s):  
Sodium Silicate ◽  
Sodium Oleate ◽  
Low Grade

This paper introduces the research on the beneficiation of a low-grade barite ore taken from Myanmar.Through the analysis of the ore properties and research on the flotation experiment, the optimum flotation conditions are determinedwhile the ore sample assays 64.32% BaSO4.Under the flotation conditions of the grinding fineness-200 meshes 80%, sodium oleate 800g / t and sodium silicate 500 g / t, “two-time roughing,one closed cleaningand open in the second cleaning operations” is applied, and two marketable barite concentrates can be obtained. The concentrate 1 and 2 contain 96.32% and 91.26%BaSO4 at the recoveries of 91.94% and 5.25%, respectively.

scholarly journals The High Temperature Co-Processing of Nickel Sulfide and Nickel Laterite Sources

Minerals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 351 ◽  
Author(s):  
Robbie G. McDonald ◽  
Jian Li
Keyword(s):  
Sulfuric Acid ◽  
Nickel Sulfide ◽  
Free Acid ◽  
Hydrolysis Product ◽  
Low Grade ◽  
Iron Sulfides ◽  
Nickel Laterite ◽  
Pressure Oxidation ◽  
Nickel Concentrate ◽  
Nickel Sulfide Concentrate

The pressure oxidation of low-grade nickel sulfide concentrate with high iron sulfides content generates significant amounts of sulfuric acid that must be neutralized. This acid can be utilized to leach metal values from ores such as nickel laterites. The present study demonstrates the use of a low-grade nickel concentrate generated from Poseidon Nickel Mt Windarra ore to enable additional nickel and cobalt extraction from a Bulong Nickel Operation nickel laterite blend. The co-processing of these materials at 250 °C, with oxygen overpressure, using total pulp densities of 30% or 40% w/w, and a range of nickel concentrate to nickel laterite mass ratios between 0.30–0.53, yielded base metal extractions of 95% or greater. The final free acid range was between 21.5–58.5 g/L, which indicates that enough in situ sulfuric acid was generated during co-processing. The acid was shown from mineralogical analysis to be efficiently utilized to dissolve the laterite ore, which indicates that the primary iron hydrolysis product was hematite, while the aluminum-rich sodium alunite/jarosite phase that formed hosts approximately 5% of the hydrolyzed iron.

scholarly journals The Effect of Sodium Alginate on Chlorite and Serpentine in Chalcopyrite Flotation

Minerals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 196 ◽  
Author(s):  
Guangjiu Pan ◽  
Guofan Zhang ◽  
Qing Shi ◽  
Wei Chen
Keyword(s):  
Zeta Potential ◽  
Sodium Alginate ◽  
Ternary Mixture ◽  
Selective Adsorption ◽  
Mineral Surface ◽  
Adsorption Model ◽  
No Adsorption ◽  
Sulfide Flotation ◽  
Adsorption Density ◽  
Density Results

Chlorite and serpentine are common magnesium-containing gangue minerals in copper sulfide flotation. In this study, sodium alginate, a natural hydrophilic polysaccharide, was introduced as a selective depressant for these gangue minerals. Micro-flotation tests were conducted on both single minerals and synthetic mixtures. The flotation results showed that sodium alginate could simultaneously depress the flotation of chlorite and serpentine effectively, but seldom influenced the floatability of chalcopyrite at pH 9. In the ternary mixture flotation, a concentrate with a Cu grade of 31% could be achieved at Cu recovery of 90%. The selective depression of chlorite and serpentine was also validated by the real ore flotation experiments. The selective depression mechanism was investigated through adsorption tests, zeta potential measurements, and FTIR analyses. The adsorption density results implied that sodium alginate selectively adsorbed on the surface of phyllosilicates, but no adsorption on the chalcopyrite surface was observed. The zeta potential results showed that the sodium alginate could selectively decrease the surface charge of chlorite and serpentine. The FTIR results revealed the chemical adsorption of sodium alginate on the chlorite and serpentine surface and no form of adsorption on chalcopyrite, agreeing well with the adsorption density results. On the basis of these results, a selective adsorption model of sodium alginate on the mineral surface was proposed.

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