Temat: electrorefining - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Models for viscosity and density of copper electrorefining electrolytes
Autorzy:: Kalliomaki, T.
Aji, A. T.
Rintala, L.
Aromaa, J.
Lundstrom, M.
Powiązania:: https://bibliotekanauki.pl/articles/109549.pdf
Data publikacji:: 2017
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: copper electrorefining
viscosity model
density model
Opis:: Viscosity and density of copper electrorefining electrolytes affect energy consumption and purity of cathode copper. Decreasing the viscosity and density increases the rate of falling of the anode slimes to the bottom of an electrorefining cell and increases the diffusivity and mobility of ions. Increasing the falling rate of the anode slimes decreases a risk of anode slime impurities ending up on the cathode and being entrapped into the copper deposit. This work introduces two new models for both viscosity and density of copper electrorefining electrolytes with high accuracy and one reconstructed improved model for some electrorefining data of viscosity published previously. The experimental work to build up these new models was carried out as a function of temperature (50, 60, 70 °C), copper (40, 50, 60 g/dm3), nickel (0, 10, 20 g/dm3) and sulfuric acid (130, 145, 160 g/dm3) concentrations for all models, and additionally arsenic concentration (0, 15, 30, 32, 64 g/dm3) was included in the viscosity models. Increasing concentrations of Cu, Ni, As and H2SO4 were found to increase the viscosity and density, whereas increasing temperature decreased both viscosity and density. The viscosity models were validated with industrial electrolyte samples from the Boliden Harjavalta Pori tankhouse. The experimental and modeling work carried out in this study resulted in improved viscosity models, having the strongest agreement with the industrial electrorefining electrolytes.
Źródło:: Physicochemical Problems of Mineral Processing; 2017, 53, 2; 1023-1037
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 2.

Tytuł:: Development of characterization methods for adherent anode slimes in copper electrorefining
Autorzy:: Kiviluoma, M.
Aaltonen, M.
Aromaa, J.
Lundstrom, M.
Forsen, O.
Powiązania:: https://bibliotekanauki.pl/articles/110440.pdf
Data publikacji:: 2016
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: anode
slime
copper
electrorefining
nickel
lead
arsenic
Opis:: Adherent anode slimes can cause anode passivation in copper electrorefining and lower the efficiency of copper electrorefining. Declining concentrate grades cause larger impurity levels in anodes, thus creating larger quantities of slimes in the refining process. In order to investigate the characterization methods for adherent anode slimes in copper electrorefining, experiments were conducted for the Boliden Harjavalta Pori refinery material. Methods such as particle size determination, chemical (ICP) analysis, settling rate determination, XRD, SEM-SE, SEM-BSE and SEM-EDS were applied. In addition, adherent anode slime samples were compared to optical micrograph and SEM-BSE images of respective anode copper samples. It was shown that SEM-EDS and SEM-BSE provided precise information about phases formed during electrorefining. The settling rate and particle size had a correlation only with a copper content of anode slime. The main phases in the anode slime were copper and lead sulphates as well as copper-silver selenides. NiO was shown to be the major Ni-bearing phase in the adherent slime. Nickel, tellurium and lead had the strongest, whereas arsenic, selenium and antimony had the weakest tendency to report to the anode slime.
Źródło:: Physicochemical Problems of Mineral Processing; 2016, 52, 1; 295-302
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 3.

Tytuł:: Copper deposition on stainless steel sheets in copper nitrate solution
Autorzy:: Kekki, A.
Aromaa, J.
Forsen, O.
Powiązania:: https://bibliotekanauki.pl/articles/110678.pdf
Data publikacji:: 2015
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: copper nitrate
electrorefining
high purity copper
hydrometallurgy
Opis:: The aim of this study was to examine factors that influence copper nitrate based electrorefining of copper and to search the best process parameters for high-purity copper deposition on AISI 316L steel blanks. Considering impurities, the most important goal was to minimize sulfur content in a copper cathode. The effect of Cu2+ concentration, current density, temperature and pH were studied. The best parameters for the best copper purity were sorted out. The most important factors for quality copper deposition are sufficiently low Cu2+ concentration, low current density, right zone and careful control of pH. Active nitrate ion reduction reactions catalyzed by copper ions are suggested to affect detrimentally both copper deposition current efficiency and purity. Furthermore, nitrate ion reactions seem to elevate an electrolyte pH so that the deposition appears to be dark brow copper oxide. The 6N purity for copper was not reached with this cell construction and it felled behind about 7 ppm (99.9993% Cu). Both, sulfur and silver concentration were slightly above 1 - 2 ppm. To minimize the impurities, electrolyte circulation and filtration are needed. Also, either a separate silver cementation cell or cementation membrane is needed.
Źródło:: Physicochemical Problems of Mineral Processing; 2015, 51, 1; 247-256
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 4.

Tytuł:: A method of proppant pack permeability assessment
Autorzy:: Lutynski, M. A.
Powiązania:: https://bibliotekanauki.pl/articles/110881.pdf
Data publikacji:: 2015
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: copper nitrate
electrorefining
high purity copper
hydrometallurgy
Opis:: Hydraulic fracturing methods used for low permeability reservoirs such as shale gas or tight gas require the use of proppants. The current standard used for proppant assessment does not take into account its interaction with the rock and the embedment effect. In this paper a new method of proppant pack permeability assessment is proposed where proppant is placed into a rock sample with induced fracture. Three types of proppant were assessed to verify the method i.e. offshore sand, onshore sand and ceramic proppant. The rock sample was a Tumlin sandstone. As the flowing medium supercritical carbon dioxide was used. Tests were performed with 300-500 μm size proppants at flowing pressure of 3 MPa and confining pressure of 5 MPa. Additional test was conducted with 1–2 mm sand proppant at two confining pressure, i.e. 5 MPa and 16 MPa. Proppant were characterized in accordance with the Krumbein/Sloss diagram. Similar values of permeability for the proppant concentration of 0.5 kg/m2 were obtained ranging from 2.3 to 3.3 D although the highest permeability was achieved with Baltic sand proppant and ceramic proppant. For the larger size of proppant (1 – 2 mm) the initial permeability with confining pressure of 5 MPa was initially larger but when the confining pressure was increased it declined by 37%. This proves that in the proposed method we can observe changes in the permeability of the fracture with change in confining pressure apply subjected to the sample.
Źródło:: Physicochemical Problems of Mineral Processing; 2015, 51, 1; 325-334
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 5.

Tytuł:: Electrorefining of High Carbon Ferromanganese in Molten Salts to Produce Pure Ferromanganese
Autorzy:: Xiao, S.J.
Liu, W.
Gao, L.
Zhang, J.
Powiązania:: https://bibliotekanauki.pl/articles/353411.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: high carbon ferromanganese
electrorefining
molten salts
pure ferromanganese
Opis:: High carbon ferromanganese is used as a starting material to prepare pure ferromanganese by electrorefining in molten salts. High carbon ferromanganese was applied as the anode, molybdenum was the cathode and Ag/AgCl was the reference electrode. The anodic dissolution was investigated by linear polarization in molten NaCl-KCl system. Then potentiostatic electrolysis was carried out to produce pure ferromanganese from high carbon ferromanganese. The cathodic product was determined to be a mixture of manganese and iron by x-ray diffraction (XRD). The content of carbon in the product was analyzed by carbon and sulfur analyzer. The post-electrolysis anode was characterized by scanning electron microscope (SEM). The mechanism of the anode dissolution and the distribution of the main impurity of carbon and silicon after electrolysis were discussed.
Źródło:: Archives of Metallurgy and Materials; 2017, 62, 3; 1505-1509
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 6.

Tytuł:: Study On The Electro-Refining Of Tin In Acid Solution From Electronic Waste
Badanie elektrorafinacji cyny w roztworze kwasu z e-odpadów
Autorzy:: Son, S. H.
Park, S. C.
Kim, J. H.
Kim, Y. H.
Lee, M. S.
Ahn, J.-W.
Powiązania:: https://bibliotekanauki.pl/articles/352665.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: electrorefining
tin
electronic waste
recycling
high purity
elektrorafinacja
cyna
odpady elektroniczne
recykling
Opis:: The tin metal could be retractable from wasted tin scrap, sludge, and wasted electroplated solution hydrometallurgical treatment, and purification process. In order to be used as resource of electronic devices, the retracted crude metal should be purified to the extent of higher than 99.9%. In this study, tin electro-refining process was performed to purify the casted tin crude metal at various experimental conditions: at the current density of 3, 5A/dm², and in various electrolytes such as hydrochloric acid, sulfuric acid and methansulfonic acid. Additional experiment was conducted using Rotating Disk Electrode (RDE) in order to investigate the rate determining step of tin electro-refining process. The current efficiency, 65.6%, was achievable at the condition of current density, 5A/dm², and in the electrolyte of Hydrochloric acid. During tin electro-refining process, impurity dissolved from tin crude metal into the electrolyte was analyzed using Inductively Coupled Plasma Optical Emission Spectrometer (ICP-OES), and the result showed the concentration of impurity metal gradually increased. Quantitative analysis on casted tin crude metal showed that it consists of tin with 93.9 wt.% and several impurity metals of Ag, Bi, Pb, Cu, and etc. After tin electro-refining process, the purity of tin increased up to 99.985 wt.%.
Źródło:: Archives of Metallurgy and Materials; 2015, 60, 2B; 1217-1220
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 7.

Tytuł:: Optimizing of Work Arc Furnace to Decopperisation of Flash Slag
Autorzy:: Bydałek, A. W.
Biernat, S.
Wołczyński, W.
Bydałek, A.
Powiązania:: https://bibliotekanauki.pl/articles/381319.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: electrorefining
decopperisation
slag suspension
arc furnace
elektrorafinacja
odmiedziowanie
żużel zawiesinowy
piec łukowy
Opis:: Discusses an attempt to optimize the operation of an electric furnace slag to be decopperisation suspension of the internal recycling process for the production of copper. The paper presents a new method to recover copper from metallurgical slags in arc-resistance electric furnace. It involves the use of alternating current for a first period reduction, constant or pulsed DC in the final stage of processing. Even distribution of the electric field density in the final phase of melting caused to achieve an extremely low content of metallic copper in the slag phase. They achieved by including the economic effects by reducing the time reduction.
Źródło:: Archives of Foundry Engineering; 2015, 15, 3; 21-24
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 8.

Tytuł:: Morphology Change Of Si Deposit In Molten Salt Electrorefining
Zmiana morfologii osadu Si podczas elektrorafinacji w stopionych solach
Autorzy:: Ryu, H. Y.
Kwon, S. C.
Han, M. H.
An, Y. S.
Lee, J. S.
Lee, J. H.
Powiązania:: https://bibliotekanauki.pl/articles/354346.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: molten salt
silicon
morphology
electrorefining
current density
sól stopiona
krzem
morfologia
elektrorafinacja
gęstość prądu
Opis:: The effects of processing parameters on the morphology change in a Si deposit recovered by means of molten salt electrorefining are evaluated using electrochemical techniques such as cyclic voltammetry and chronopotentiometry at 800°C. It was found that concentration of K₂SiF₆ and current density were important parameters in determining deposit size. Higher concentrations of K₂SiF₆ were effective in coarsening the silicon deposit and decreasing the cell potential. Silicon nanofiber was recovered at 5 wt% of K₂SiF₆ whereas dense particles were prepared at 30 and 50 wt% of K₂SiF₆. The morphology of the Si deposit was determined by the concentration of Si in the electrolyte which is related to the formation of crystal and growth of Si. The formation mechanism of the Si deposit was interpreted by using high resolution TEM as well as electrochemical properties.
Źródło:: Archives of Metallurgy and Materials; 2015, 60, 2B; 1491-1497
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 9.

Tytuł:: The perspective of solar and wind energy utilisation in the copper electrorefinement
Perspektywa wykorzystania energii słońca i wiatru w elektrorafinacji miedzi
Autorzy:: Głąb, T.
Jurasz, J.
Boratyński, J.
Powiązania:: https://bibliotekanauki.pl/articles/96556.pdf
Data publikacji:: 2016
Wydawca:: Fundacja Ekonomistów Środowiska i Zasobów Naturalnych
Tematy:: odnawialne źródła energii
elektroliza
elektrorafinacja
miedź
innowacyjne technologie
renewable energy
electrolysis
electrorefining
copper
innovative technologies
Opis:: Odnawialne źródła energii (OZE) pozwalają na wykorzystanie energii promieniowania elektromagnetycznego Słońca w formie bezpośredniej lub poprzez produkty fotosyntezy, energię kinetyczną wiatru, wody itd. W przypadku fotosyntezy, której akumulowana energia jest później pośrednio wykorzystywana w biogazowniach oraz w innych systemach OZE trzeba mieć świadomość niskiej 3–6% wydajności tego procesu. Proponujemy rozważenie zastosowań uwzględniających ograniczenia wynikające z natury OZE w technologiach akceptujących te uwarunkowania. Rozważania opieramy na przykładzie energochłonnego procesu elektrorafinacji miedzi, w którym zużywane jest 300 400 kWh (1,08 1,44 GJ) energii elektrycznej na wydzielenie tony (103 kg) miedzi. Zapewnienie ciągłości procesu można osiągnąć poprzez nowe rozwiązania technologiczne lub w najgorszym przypadku przez wspomaganie energią ze źródeł konwencjonalnych. Nie można wykluczyć, że efektem tych działań będą rozsiane po całym kraju niewielkie instalacje rafinujące miedź, spełniające wymogi środowiskowe i sprzężone z nimi wytwórnie specjalistycznych stopów miedzi. Podejście nie powinno być ograniczone do elektrorafinacji miedzi. Przy źródłach OZE można będzie lokować inne technologie, a nowe rozwiązanie staną się inspiracją do multidyscyplinarnych innowacji.
Źródło:: Ekonomia i Środowisko; 2016, 4; 179-193
0867-8898
Pojawia się w:: Ekonomia i Środowisko
Dostawca treści:: Biblioteka Nauki