copper lead
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Author(s):  
Sergey Grigorievich Ponomarev ◽  
Maxim Vitalievich Kornyushin ◽  
Victor Victorovich Rybalchenko

Author(s):  
A. N. Glukhov ◽  

The author characterizes gold, silver, copper, lead, and zinc deposits developed within the Omolon craton terrane. Outlined are ore formations (genetic types) including the deposits. The principal features of the terrane metallogeny terrane are shown as determined by the stable structure of the crystalline basement, consolidated in Early Precambrian, which resulted in contraction of the range of mineralization genetic types and in formation of deep ore- and magma-controlling faults and large deposits.


Crystals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1133
Author(s):  
Hui Li ◽  
Yutian Fu ◽  
Jinglong Liang ◽  
Le Wang ◽  
Hongyan Yan ◽  
...  

With the increase of zinc resource consumption, the recovery and utilization of zinc resources in zinc suboxide has become one of the current research hotspots. In this study, the electrochemical method was used to remove the impurities in the zinc leaching night and enrich the zinc ferrite in the ammonia leaching residue for the solution and ammonia leaching slag after the ammonia leaching of zinc hypoxide, in order to realize the comprehensive utilization of the essence of zinc immersion night and new resources. The results showed that the reduction potentials of copper, lead, cadmium, and zinc in the ammonia leaching solution were analyzed by electrochemical testing methods to be −0.76 V, −0.82 V, −0.94 V, and −1.3 V, respectively. Through constant potential electrodeposition, the removal rate of copper, lead, cadmium. The removal rate of cadmium is 98.73%, and the removal rate of lead and copper is more than 99%. The purified ammonia leaching solution is evaporated at 90 °C for 25 min to obtain basic zinc carbonate. The purity of ZnO obtained after calcination at 500 °C for 120 min is 96.31%. The ammonia leaching residue was pickled with 3 mol·L−1 acetic acid for 30 min to effectively remove PbCO3, and then magnetic separation was carried out with a current intensity of 1.4 A. The final zinc ferrite content was 83.83%.


Heritage ◽  
2021 ◽  
Vol 4 (3) ◽  
pp. 2377-2389
Author(s):  
David Thickett

The altered nature of archaeological metals means they deteriorate at much lower relative humidity (RH) conditions than historical metals. The study of deterioration for such materials is hampered by their complexity, variability and difficulties in measuring deterioration. Placing an object in a sealed container, controlling the RH and pollutant gases and measuring any decrease in oxygen concentration is an accessible method to measure the deterioration rate. It has been used for research into suitable environmental conditions to manage the deterioration rates of such artefacts, including the differences in the response of artefacts from different excavation sites. Some objects need the careful control of RH to low values; this is expensive to maintain and poses risks to other artefacts displayed together. Many objects are actually stable up to quite high RH values, and oxygen depletion testing has been used to identify those that can be safely displayed with minimal environmental control. The accelerated corrosion ‘Oddy’ test is frequently used to sift out unsuitable display materials. T the visual assessment is widely recognized to be subjective. the test container has been modified and oxygen depletion appears to give good quantitative measurements of corrosion that correspond with both visual comparison and corrosion loss measurement with linear stripping voltametry or chemical stripping for copper, lead and steel but not for silver.


2021 ◽  
Vol 23 ◽  
pp. 100219
Author(s):  
Mohammad Eftekhari ◽  
Mohammad Gheibi ◽  
Hossein Azizi-Toupkanloo ◽  
Zahra Hossein-Abadi ◽  
Majeda Khraisheh ◽  
...  

Author(s):  
Adel Shirazy

Abstract: Mesgaran copper deposit is located in Sarbisheh city of South Khorasan province of Iran. To investigate the geochemical changes of the elements with increasing depth in the deposit, geochemical sections for important minerals related to mineralization in the area including copper, lead, zinc and cobalt were drawn for 9 exploratory boreholes. In these sections, the trend of changes of different elements versus depth is shown and the resulting diagrams were drawn for different boreholes. As a result, there is a significant relationship between the elements. With increasing the drilling depth, the amount of copper decreased and the amount of copper in each section was determined according to its cause. Keywords: Geochemistry, Copper deposit, Exploratory borehole, geochemical section.


2021 ◽  
pp. 139-147
Author(s):  
Odewusi Odeyinka Olufunsho ◽  
Ukpong Udeme Peace ◽  
Olaniyan Olaolu Olayinka ◽  
Olayanju Aimien Joy

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