scholarly journals On the possibility of flotation processing of technogenic gold-containing waste from enrichment plants

2021 ◽  
Author(s):  
L.V. Semushkina ◽  
◽  
S.M. Narbekova ◽  
Keyword(s):  
Chemical Analysis ◽  
Main Part ◽  
Gold Recovery ◽  
Butyl Xanthate ◽  
Flotation Reagent ◽  
Rational Analysis ◽  
Gold Extraction ◽  
Foaming Agent ◽  
Flotation Tailings ◽  
Fine Grained

The aim of the work is the flotation processing of gold-containing tailings using composite flotation (CF) agents. According to the results of chemical analysis, the studied tailings sample contains 0.39 g/t gold. The main part of the initial tailings sample is represented by rock-forming minerals such as quartz, clinochlore, microcline, tremolite, albite, calcite, and muscovite. According to the results of the rational analysis, 39.50% of gold is in the hard-to-recover form with quartz; 28.87% is in the form of fine-grained gold; 31.63% is in intergrowths with sulfides and rocks. The optimum reagent scheme of flotation processing of tailings was chosen: degree of regrinding of 95% of grade -0,074 mm, consumption of sodium butyl xanthate of 100 g/t, consumption of foaming agent T-92 of 30 g/t. Under the chosen reagent scheme the gold-containing concentrate containing 6,4 g/t gold at the recovery of 49,68% was obtained. Preliminary regrinding of tailings allows to increase the gold recovery in the blanks concentrates by 27.96%. The reagent scheme of flotation of gold-containing tailings with the application of composite flotation (CF) agent was tested. A composition of sodium butyl xanthate and reaeflot was used as a composite flotation reagent for the improvement of gold extraction from flotation tailings. Application of composite flotation (CF) agent pre-treated on the dispersant increases gold recovery into gold-containing concentrate by 4.65%, in comparison with the basic collector sodium butyl xanthogenate. Consumption of flotation agent CF is reduced by 20%.

Mineral Processing Experiment of Copper Mineral in Yunnan Province

2013 ◽  
Vol 652-654 ◽  
pp. 2471-2474
Author(s):  
Yi Miao Nie ◽  
Jin Xia Zhang ◽  
Qi Hui Dai
Keyword(s):  
Chemical Analysis ◽  
Mineral Composition ◽  
Yunnan Province ◽  
Sodium Sulfide ◽  
Copper Recovery ◽  
Optimum Conditions ◽  
Butyl Xanthate ◽  
Foaming Agent ◽  
Copper Mineral ◽  
Ore Grade

Based on the chemical analysis and mineral composition research, a series condition tests were done with ore grade 1.45%.The optimum conditions were grinding fineness -0.074mm65%, collector as butyl xanthate- Ammonium aerofloat butyl(3:1) with 100g/t ,activator as sodium sulfide 200g/t,foaming agent as 2#oil of magnetite 30g/t. The result of tests showed that the grade of copper concentrate and the copper recovery are 8.98% and79.50% by adopting a circuit of one rough flotation, two scavenger.

scholarly journals Performance-Based Selection of the Cathode Material for the Electrodeposition-Redox Replacement Process of Gold Recovery from Chloride Solutions

2021 ◽  
Author(s):  
Ivan Korolev ◽  
Kirsi Yliniemi ◽  
Mari Lindgren ◽  
Leena Carpén ◽  
Mari Lundström
Keyword(s):  
Material Selection ◽  
Recovery Process ◽  
Multiple Attribute Decision Making ◽  
Gold Recovery ◽  
Process Efficiency ◽  
Gold Extraction ◽  
Corrosion Properties ◽  
Multiple Attribute ◽  
Replacement Process ◽  
Cathode Substrate

AbstractRecently, an emerging electrodeposition-redox replacement (EDRR) method was demonstrated to provide exceptionally efficient gold recovery from cyanide-free hydrometallurgical solutions. However, the effect of electrode material and its corrosion resistance in this process was overlooked, even though the EDRR process is carried out in extremely corrosive, acidic chloride solution that also contains significant amounts of strong oxidants, i.e., cupric ions. In the current study, nickel alloy C-2000, stainless steels 316L and 654SMO, and grade 2 titanium were for the first time critically evaluated as potential cathode materials for EDRR. The particular emphasis was placed on better understanding of the effect of cathode substrate on the overall efficiency of the gold recovery process. The use of a multiple attribute decision-making method of material selection allowed reaching of a well-founded compromise between the corrosion properties of the electrodes and process efficiency of gold extraction. The 654SMO steel demonstrated outstanding performance among the examined materials, as it enabled gold recovery of 28.1 pct after 3000 EDRR cycles, while its corrosion rate (CR) was only 0.02 mm/year.

Nouvelles observations sur les roches vertes de l'anticlinal de Laniscat-Merleac (Cotes-du-Nord)

1963 ◽  
Vol S7-V (5) ◽  
pp. 844-851 ◽  
Author(s):  
Jean Nicolas ◽  
Jean Paul Sagon
Keyword(s):  
Chemical Composition ◽  
Chemical Analysis ◽  
Rock Sample ◽  
Coarse Grained ◽  
Northern Flank ◽  
Fine Grained ◽  
Rock Supports

Abstract Observations on the dolerites of the northern flank of the E-W-trending Laniscat-Merleac anticline in NW France suggest that the rocks were emplaced as coulees. A well-marked granular differentiation in the rock supports this hypothesis; the coarse-grained rocks are in contact with Devonian rocks at the bottom of the coulee and the fine-grained rocks are in contact with Dinantian rocks at the top. Chemical analysis shows that there is a diminishing of Na <sub>2</sub> O and an augmentation of the percentage of CaO ranging from the boundary of the coarse-grained rock to that of the fine-grained. Overlying the green rocks are green schists of comparable chemical composition attributed to former tuffs which were subject to regional epimetamorphism. Finally, a coarse-grained, green rock sample has been traced to the spilite family.

scholarly journals Bio-Oxidation of a Double Refractory Gold Ore and Investigation of Preg-Robbing of Gold from Thiourea Solution

Metals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1216
Author(s):  
Rui Xu ◽  
Qian Li ◽  
Feiyu Meng ◽  
Yongbin Yang ◽  
Bin Xu ◽  
...  
Keyword(s):  
Mixed Culture ◽  
Active Sites ◽  
Gold Recovery ◽  
Ftir Analysis ◽  
Gold Extraction ◽  
Gold Ores ◽  
Gold Ore ◽  
Thiourea Solution ◽  
Refractory Gold ◽  
Pure Cultures

Carbonaceous sulfidic gold ores are commonly double refractory and thus require pretreatment before gold extraction. In this paper, the capacity of pre-bio-oxidation can simultaneously decompose sulfides or deactivate carbonaceous matters (CM) from a double refractory gold ore (DRGO) using pure cultures of A. ferrooxidans or L. ferrooxidans, and a mixed culture containing A. ferrooxidans and L. ferrooxidans was investigated. The results showed that direct thiourea leaching of the as-received DRGO yielded only 28.7% gold extraction, which was due to the encapsulation of sulfides on gold and the gold adsorption of CM. After bio-oxidation, thiourea leaching of the DRGO resulted in gold extraction of over 75–80%. Moreover, bio-oxidation can effectively reduce the adsorption of carbon to gold. XRD, SEM-EDS and FTIR analysis showed that many oxygen-containing groups were introduced on the surface of DRGO during bio-oxidation, while the C=C bond was cleaved and the O–C–O and C–N bonds were degraded, causing a decrease in active sites for gold adsorption. Moreover, passivation materials such as jarosite were formed on the surface of DRGO, which might reduce the affinity of CM for gold in solutions. In addition, the cleavage of the S–S band indicated that sulfides were oxidized by bacteria. This work allows us to explain the applicability of pre-bio-oxidation for degrading both sulfides and CM and increasing gold recovery from DRGO in the thiourea system.

A thermal and X-ray investigation of scarbroite

1960 ◽  
Vol 32 (248) ◽  
pp. 353-362 ◽  
Author(s):  
W. J. Duffin ◽  
J. Goodyear
Keyword(s):  
Electron Diffraction ◽  
Chemical Analysis ◽  
Diffraction Data ◽  
Room Temperature ◽  
Layer Structure ◽  
Electron Diffraction Data ◽  
X Ray ◽  
Fine Grained ◽  
The North

SummaryScarbroite, a fine-grained but compact deposit obtained from fissures in the sandstone on the north Yorkshire coast, is shown by chemical analysis to have an idealized formula Al2(CO3)3·12Al(OH)3. X-ray and electron diffraction data indicate a triclinic cell with a 9·94 Å., b 14·88 Å., c 26·47 Å., α 98·7°, β 96·5°, and γ 89·0°. A layer structure consisting of gibbsite-type sheets of Al(OH)3 and sheets of Al2(CO3)3 is proposed. The structure is stable from room temperature to about 125° C.

I. Whiteite, a new species, and a proposed nomenclature for the jahnsite-whiteite complex series. II. New data on xanthoxenite. III. Salmonsite discredited

1978 ◽  
Vol 42 (323) ◽  
pp. 309-323 ◽  
Author(s):  
Paul Brian Moore ◽  
Jun Ito
Keyword(s):  
New Species ◽  
Chemical Analysis ◽  
Specific Gravity ◽  
Yukon Territory ◽  
Breakdown Product ◽  
Pure Material ◽  
Fine Grained ◽  
Intimate Mixture ◽  
Species Type ◽  
A New Species

SummaryWhiteite, Ca(Fe,Mn)2+Mg2Al2(OH)2 (H2O)8[PO4]4, a 14·90(4) Å, b 6·98(2) Å, c 10·13(2) Å, β 113° 07(10)′, Z = 2, space group P2/a, α 1·580(5), β 1·585(5), γ 1·590(5), 2V 40–50°, specific gravity 2·58, is a new species from the Ilha de Taquaral, Minas Gerais, Brazil. It is the Al3+-analogue of jahnsite. The mineral occurs as up to 5 mm tan crystals flattened on {001}. Twinning by reflection on {001} leads to pseudoorthorhombic development. Rather pure material also occurs from Blow River, Yukon Territory, Canada.For the general formula XM(1)M(2)2M(3)2(OH)2 (H2O)8[PO4]4, it is proposed that for M(3), Al3+ > Fe3+, the established members of the series are whiteite—(CaFe2+Mg) and whiteite—(Mn2+Fe2+Mg); and for Fe3+ > Al3+, jahnsite—(CaMn2+Mg), jahnsite—(CaMn2+Fe2+), and possibly jahnsite—(Mn2+Mn2+Mn2+).Xanthoxenite of Laubmann and Steinmetz (1920) is probably stewartite (in part) on the basis of morphological, optical, physical, and paragenetic evidence. The xanthoxenite of Frondel (1949) is proposed as the species type. It is triclinic, P or P1, a 6·70(4) Å, b8·85(4) Å, c 6·54(3) Å, α 92·1(2)°, β 110·2(2)°, γ 93·2(2)°, Z = 1 for composition .Salmonsite, c. from Pala, California, is shown to be an intimate mixture of hureaulite and jahnsite on the basis of calculated and observed powder patterns and on reinterpretation of the original chemical analysis published by Schaller (1912). It is a breakdown product resulting from oxidation of Fe2+ in the original hureaulite (‘palaite’) along with further aquation followed by fine-grained recrystallization. The reaction proposed is:

Biological Production of Copper Sulfide Concentrate from Flotation Tailings and Low Grade Ore

2017 ◽  
Vol 262 ◽  
pp. 202-206 ◽  
Author(s):  
Víctor J. Zepeda ◽  
Ivan Nancucheo ◽  
Milton Guillen ◽  
Enrique Becerra ◽  
Camila Escuti ◽  
...  
Keyword(s):  
Copper Sulfide ◽  
Mine Drainage ◽  
Mining Industry ◽  
Low Grade ◽  
Copper Ore ◽  
Flotation Reagents ◽  
Selective Precipitation ◽  
Flotation Tailings ◽  
Fine Grained ◽  
Fine Chemistry

Flotation tailings are hazardous due to physical and chemical instability and are currently considered one of the main pollution concerns of mining industry. Most of these tailings are fine-grained residues with low copper content (0.1-0.8%) and include toxic compounds, such as heavy metals, arsenic, and flotation reagents, among others. Another hazard is the generation of acid mine drainage (AMD) due to biological oxidation of tailings. On the other hand, low-grade ore is challenging the mining industry to commercially produce copper.The main objective of this work was to assess the use of flotation tailings and low-grade ore to produce a biologically-produced copper sulfide, as a product for further pyrometallurgical or fine chemistry processing. Low-grade ore and flotation tailings were first agglomerated at different proportions and leaching tests were performed in 1m columns, using either industrial or synthetic raffinate solution. Then, the PLS solution obtained from the column tests was subjected to selective precipitation of copper by using biogenic hydrogen sulfide (H2S) generated by a mixed culture of neutrophilic sulfate reducing bacteria (SRB), enriched from sediments of Caracarani river (located at 4,600 m over sea level in northern Chile).Over 91% of the copper soluble present in the PLS was recovered as copper sulfide in 28 days, while ferrous iron, other metals and arsenic remained in solution. Analysis performed by XRD confirmed the presence of copper in the precipitate (58% as covellite). This work demonstrates the possibility to apply bioleaching and bio-precipitation technologies to treat tailings and low-grade copper ore to produce a high quality copper sulfide.

Percolation bioleaching of copper and zinc and gold recovery from flotation tailings of the sulfide complex ores of the Ural region, Russia

2012 ◽  
Vol 111-112 ◽  
pp. 82-86 ◽  
Author(s):  
Tamara F. Kondrat'eva ◽  
Tatiana A. Pivovarova ◽  
Alexandr G. Bulaev ◽  
Vitaliy S. Melamud ◽  
Maxim I. Muravyov ◽  
...  
Keyword(s):  
Ural Region ◽  
Gold Recovery ◽  
Flotation Tailings ◽  
Copper And Zinc

scholarly journals Current methods of technogenic gold placer deposit mining with small size gold extraction technology

2021 ◽  
Vol 43 (4) ◽  
pp. 458-466
Author(s):  
S. A. Prokopiev ◽  
E. S. Prokopiev ◽  
I. V. Kadesnikov ◽  
N. A. Cherimichkina
Keyword(s):  
Raw Materials ◽  
Mineralogical Composition ◽  
Placer Deposit ◽  
Gold Recovery ◽  
Raw Material ◽  
Productive Capacity ◽  
Gold Content ◽  
Gold Placer ◽  
Gold Extraction ◽  
Extraction Technology

The purpose of this article is to conduct industrial tests of spiral separation technology on technogenic refractory raw materials. The object of the study is the Yurskoye gold placer deposit in the Republic of Sakha (Yakutia). An OKV-100 benefication complex with the productive capacity of 100 m3 /h by initial sands was set up in order to conduct pilot mining of the fine-grained tailings dumps of the Yurskoye deposit with the maximum extraction of small size gold. Sands supplied from the different sections of the technogenic deposit had different gold content, granulometric characteristics, and mineralogical composition. The study included experiments carried out at different initial feed; equipment was adjusted for specific raw material depending on productive capacity, liquid/solid ratio, product yield of the small size gold recovery module. The complex productivity was from 90 to 150 m3 /h. The yield and extraction of gold-bearing concentrate, as well as its gold content were determined. The pilot washing with the use of small size gold recovery technology resulted in the average additional gold recovery from sluice tailings of 19.07 %, which is a high indicator, given the low content of gold in technogenic placers. The technology under consideration can be used for the development of both technogenic and operated gold placer deposits.

scholarly journals Distribution of Arsenic with Iron, Manganese and Copper in Borehole Sediments of the River Tista and Jamuna

2013 ◽  
Vol 61 (2) ◽  
pp. 207-210 ◽  
Author(s):  
Mohammad Arifur Rahman ◽  
Md Jahangir Alam ◽  
Nur-E-Alam Siddique ◽  
AM Shafiqul Alam
Keyword(s):  
Organic Matter ◽  
Organic Carbon ◽  
Chemical Analysis ◽  
Arsenic Concentration ◽  
Sediment Layer ◽  
Fine Grained ◽  
Lower Depth ◽  
Iron Manganese ◽  
Clay Type

Boreholes sediments (1-6 m depth) of the river Tista and Jamuna in Bangladesh were collected for the analysis of As, Fe, Mn, Cu and organic carbon. Chemical analysis reveals that Mn and Fe hydroxides and organic matter are the major leachable solids which carrying As. High levels of arsenic concentration in aquifers are associated with fine grained sediments at the lower depth of the sediment layer. The highest As containing sediment was gray and texture of sediment was clay type. The colour of the least As containing sediment was white and texture of sediment was sandy. In addition, this study indicate that As is closely associated with Fe and slightly correlated with Mn and Cu in the sediment of the river Tista and Jamuna. Arsenic was distributed regularly DOI: http://dx.doi.org/10.3329/dujs.v61i2.17072 Dhaka Univ. J. Sci. 61(2): 207-210, 2013 (July)

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