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    Wyświetlanie 1-11 z 11
    Tytuł:
    Practical experience with welding new generation steel PB2 grade assigned for power industry
    Doświadczenia przy spawaniu złączy doczołowych rur z nowej generacji stali w gatunku PB2 przeznaczonej dla przemysłu energetycznego
    Autorzy:
    Kwieciński, K.
    Urzynicok, M.
    Łomozik, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/354134.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    stal PB2
    złącza doczołowe rur
    spawanie
    martensite PB2 steel
    pipe butt welds
    new steel grades
    welding
    Opis:
    This paper presents a new generation steel PB2 grade assigned for the power industry. In this article the authors present the results of non-destructive (VT, PT, RT) and destructive (tensile test, bending test, hardness measurements, impact strength, macro- and micrograph, fractography) tests. The major objective of the examinations was to verify properties of welded joints made of PB2 steel. Investigation of welded joints made of PB2 steel was performed in Instytut Spawalnictwa in Gliwice and it brings one of the first positive results for this type of steel in the world.
    W artykule scharakteryzowano stal nowej generacji w gatunku PB2 przeznaczoną dla przemysłu energetycznego. Zaprezentowano wyniki badań nieniszczących (VT, PT, RT) i niszczących (statyczna próba rozciągania, próba zginania, pomiar twardości, pomiar pracy łamania, badania metalograficzne makro- i mikroskopowe) mające na celu sprawdzenie własności połączeń spawanych wykonanych z tego gatunku stali. Badania połączeń spawanych rur ze stali PB2, przeprowadzone w Instytucie Spawalnictwa w Gliwicach są jednymi z pierwszych wyników badań tej stali na świecie.
    Źródło:
    Archives of Metallurgy and Materials; 2011, 56, 1; 37-45
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sorption of lead(II) on copper(II) and nickel-potassium hexacyanoferrates and magnetite-loaded resin from inorganic acid solutions
    Autorzy:
    Kubica, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/148491.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    sorption
    Pb2+
    hexacyanoferrates
    composite sorbents
    distribution coefficient (Kd)
    Opis:
    The sorption of Pb2+ on the composite sorbent obtained by incorporating of copper(II)-potassium hexacyanoferrate or nickel(II)-potassium hexacyanoferrate and magnetite into sulphonated phenolic resin was studied. The sorption kinetics were performed in hydrochloric, nitric and sulphuric acid solutions in the concentrations range from 10-4 molźdm-3 to 1 molźdm-3. The distribution coefficients for the lead(II) sorption on the sorbents in these conditions were determined. The highest Kd values, more than 1000 cm3źg-1, were obtained for composite sorbents CuNCFM from HCl, HNO3 and H2SO4 (range concentration 10-4-10-2) and for CuNCF and NiNCF from HCl (range concentration 10-4-10-2). Also, the lead(II) sorption on the magnetite-loaded resin was performed.
    Źródło:
    Nukleonika; 2010, 55, 2; 163-168
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of the interaction between the CuZn38Pb2 matrix and the Fe reinforcement phase during the production of the complex relief MMCs
    Autorzy:
    Spasova, D.
    Atanasov, N.
    Radev, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/391854.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
    Tematy:
    MMCs
    copper alloy CuZn38Pb2
    Fe reinforcement particles
    Opis:
    The present paper is relevant to the investigation of the interaction between the copper alloy metal matrix (CuZn38Pb2) and the reinforcement phase (Fe) during the production of “hybrid” complex relief MMCs. An innovative production method is used for the creation of composites that have been brought to the application of different space vacuum schemes for composite synthesis of vacuuming the space by using the notion of “capillary forming”. In this method, the metal matrix (copper alloy melt) was forcedly infil- trated in the space between the reinforcement phase (Fe) particles as opposed to the classical method to obtain MMCs, uses a mechanism of insertion of the reinforcement phase into the ready for use melt, followed by homogenization of the composite structure. In this paper is presented a cost-effective production processes for metal-matrix composites by using single blanks implementing conventional methods for mould production (in expendable cement mould). Studies were also carried out metallographic and X-ray diffraction phase analysis to clarify the phase composition and the ongoing diffusion processes due to the high temperature process of production of complex relief MMC. Microhardness of the composite phase was also measured.
    Źródło:
    Prace Instytutu Odlewnictwa; 2017, 57, 4; 315-319
    1899-2439
    Pojawia się w:
    Prace Instytutu Odlewnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Efficient solidification of Pb2+ by activated tungsten tailings and cement
    Autorzy:
    Cheng, Hao
    Kuang, Jingzhong
    Zhu, Luping
    Yuan, Weiquan
    Huang, Zheyu
    Yang, Yiqiang
    Powiązania:
    https://bibliotekanauki.pl/articles/24085840.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    tungsten tailings
    activation
    Pb2+
    Solidification
    C-S-H gel
    Opis:
    The preparation of cementing admixture from tailings and co-solidification of Pb2+ with cement is a green way to realize the resource utilization of tailings and treatment of the lead-containing wastewater. In this paper, the tungsten tailings were activated in different ways, and the mechanical properties of the tungsten tailings-cement solidified body with different activation systems and the solidification behavior of Pb2+ were studied. The phase and microstructure of the hydrated product were characterized by XRD, FT-IR, SEM and EDS. The results showed that the curing effect of Pb2+ was obviously different of different activation systems, and the curing effect of the solidified body of the ternary composite activation system (TCAS) was the best, second only to the pure cement system (PCS). Different activation methods have a significant impact on the mechanical properties of the solidified body. With the increase of the Pb2+ content, the compressive strength of the solidified body gradually decreased, the Pb2+ leaching concentration gradually increased; with the extension of the curing age, the compressive strength gradually increased, and the Pb2+ leaching concentration gradually decreased. In particular, the compressive strength of the 28d solidified body was 31.43 MPa and the leaching concentration of Pb2+ was only 0.38 mg/L when the Pb2+ content was 5%. The phase, microstructure and EDS results of the hydration products showed that Pb2+ was mainly solidified in the C-S-H gel.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 2; art. no. 162618
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Activation mechanism of tantalum niobium flotation by lead ions in a combined collector flotation system
    Autorzy:
    He, Mingfei
    Li, Shuangke
    Cao, Miao
    Gao, Yude
    Bu, Hao
    Meng, Qingbo
    Powiązania:
    https://bibliotekanauki.pl/articles/1448361.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    tantalum niobium ore
    Pb2+ ions activation
    ammonium dibutyl dithiophosphate
    coadsorption
    Opis:
    The effect of lead ions on the flotation activation of tantalum niobium ore (TNO) was studied by micro-flotation, adsorption capacity experiments, solution chemical composition calculations, and infrared spectral analysis. The experimental demonstrated that the combined collector of salicylhydroxamic acid (SHA) and ammonium dibutyl dithiophosphate (ADDP) resulted in a strong collection capacity for TNO in the presence of lead ions. The solution chemistry calculations determined that the dominant source of lead ions in the aqueous solution was $Pb(OH)^+$ at a pH of 8, which was conducive to the adsorption and interaction of SHA and ADDP anions. In the lead ion activation system, the combined reagent co-adsorbed onto the TNO surface, causing a large negative shift in the zeta potential. The co-adsorption mechanism of the combined collector consisted of complex chemisorption between SHA and the TNO surface active particles, while the main adsorption of ADDP is physisorption.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2021, 57, 1; 29-38
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ modyfikacji zeolitów na ich właściwości fizykochemiczne
    Impact of zeolites modification on their physicochemical properties
    Autorzy:
    Świderska-Dąbrowska, R.
    Schmidt, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1819297.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    ion exchange
    natural clinoptilolite
    removal
    cations
    metals
    Cr3+
    cu2+
    pb2+
    Fe3+
    Opis:
    Zeolites are crystalline, hydrated aluminosilicates of alkali and alkaline earth metals (Na, K, Mg, Ca, Sr, Ba), in which the pore size is 0.3-1.2 nm and depends on the structure of the zeolite. They consist of tetrahedrons of [AlO4]-5- and [SiO4]4-, which make ordered crystal lattice of rings, channels and chambers. Variable degree of oxidation of silicon (IV) and aluminum (III) causes their electronegative character. The size of the charge may determine the adsorption, ion exchange and catalytic capacities of zeolite. The structure made of ring tetrahedron units contains open tunnels, making zeolites also molecular sieves. Zeolites are mostly used for adsorption of ammonium ions from aqueous solutions, removal of radioactive elements and heavy metals, and recent studies suggest the possibility of application of zeolites for removal of chloroorganic compounds and oily pollutants. The most widely used zeolite in practice for water and wastewater treatment is clinoptilolite, which is characterized by large ion exchange and adsorption capacity. Authors of many works explain the adsorption process with ion exchange. But when interpreting the results the authors do not consider that the zeolites have also tunnels that make them also molecular sieves. As a result of ion adsorption on clinoptilolite in hydrogen or sodium form, pH of the solution decreases, resulting in possible formation of electropositive, electronegative complexes and dissociated ions which make up aquaions, increasing or decreasing the effectiveness of their removal. During usage of modified zeolites for the adsorption of ions from aqueous solutions, many accompanying processes take place, such as precipitation, coprecipitation and catalytic adsorption. The influence of the physicochemical properties of natural zeolite and zeolite in the hydrogen form on an aqueous solution in the process of washing out is presented in the paper. Presented results clear prove that the decisive factor affecting the quality of the aqueous solution after the washing out process is initial pH of the solution. Depending on method of modification, physicochemical properties of zeolites can vary considerably. Transformation of natural zeolite into the hydrogen form increases its acidity and physical and chemical resistance. Modification of zeolite with HCl may also increase the content of pure zeolite by dissolution of other, non-zeolite materials. Zeolite H has a greater content of of silicon and aluminum compounds in relation to total mass which is a result of introduction of protons into the zeolite. This is confirmed by lower content of alkali metals and alkaline earth metals (sodium, calcium and potassium) in ZH. Exchange of ions of sodium, potassium, calcium for protons is a result of modification of ZN with HCl. Examination of washing out process showed that there is a small migration of impurities (Fe and Ca) from ZH as compared to ZN. At the same time increase of iron content in the solution increases its turbidity. And also turbidity depends on the initial pH of the solution. It's highest value was observed when the initial pH was equal to 6. Significant increase of turbidity as a function of pH is mainly caused by abrasion of zeolite grains in the process of shaking and by formation of precipitable complexes of iron and calcium. The paper presents also the results of zeta potential measurements. potential of H zeolite in the investigated range of pH has a much higher absolute values compared to ZN and vary in the range from -20 mV to -30 mV. H zeolite has a higher electrostatic activity than natural zeolite. Potential creating ions such as H+ and OH- have decisive influence on the zeolite surface charge.
    Źródło:
    Rocznik Ochrona Środowiska; 2012, Tom 14; 460-470
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Response of vitamins A, E, hematological and serum biochemical markers in Crucian carp (Carassius auratus gibelio) exposed to environmental Pb2+ and Cd2+
    Autorzy:
    Khan, Sher
    Zhou, Peiyuan
    Liu, Xiaoyu
    Li, Hong
    Li, Jingna
    Rehman, Zia ur
    Ahmad, Ijaz
    Powiązania:
    https://bibliotekanauki.pl/articles/1039010.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    vitamins A and E
    hematology
    serum chemistry
    Crucian carp (Carassius auratus gibelio)
    Cd2+
    Pb2+
    Opis:
    Toxicity of Pb2+ and Cd2+ is a widespread issue in the world; however, few studies have been conducted to understand their effect at environmentally realistic concentration in a mixture. In the present study, Crucian carp was exposed to Pb2+ (30 µg·l-1), Cd2+ (100 µg·l-1) and their mixture (30+100 µg·l-1) for 96 h and 21 d period to assess changes in the liver and muscle vitamin A and E content, and hematological and serum biochemical parameters. The results indicated significant decline in the level of antioxidant vitamins A, E and alterations in the hematological and serum biochemical indices. The toxicity revealed anemia, impairment of the liver and kidney with evident responses after 21 d exposure due to additive effect of Pb2+ and Cd2+ in mixture. Moreover, the differential response of vitamins A, E and blood parameters to low levels of waterborne Pb2+ and Cd2+ in freshwater fish can be used as biomarkers for monitoring contamination of aquatic environment.
    Źródło:
    Acta Biochimica Polonica; 2015, 62, 3; 581-587
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Removal of Pb(II) ions from aqueous solution using complexation-ultrafiltration
    Autorzy:
    Şahin, D.
    Tascıoglu, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/779180.pdf
    Data publikacji:
    2018
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    Ligand-modified micellar-enhanced ultrafiltration
    LM-MEUF
    Pb2+ ions
    dithizone
    DZ
    sodium dodecyl sulfate
    SDS
    Opis:
    Ligand-modified micellar-enhanced ultrafi ltration (LM-MEUF) is a membrane technique based on a separation process which can be used for removal of target metals from an aqueous solution. This method involves adding both a metal complexing ligand and surfactant molecule to the aqueous solution under conditions where most of the molecules are present as micelles. This ligand can be attached to the surface of micelles by solubilization and forms the ligand complexes with the metal ion. The aqueous solution is then treated through a membrane which has to be smaller pore sizes than those of the complexes. Hence, permeate water is then purified from the heavy metals. In this study, divalent lead is the target ion in a solution. Filtration experiments were performed with ultrafi ltration membrane system, equipped with a regenerated cellulose membrane with a 5000 Daltons cutoff. The pressure was fixed at 4.0 bar with a permeate flow rate of 500 mL min–1 . Complexes of Pb2+  ions with three ligands were investigated in micellar medium of different surfactants at different pH values to determine the ligands which could provide separation. Different parameters affecting the percentage rejection of the Pb2+ , such as pH and surfactant concentration were also discussed. Results have shown that the maximum percentage of the Pb2+  ions rejection were obtained using sodium dodecyl sulfate (SDS) as a surfactant and dithizone (DZ) as the lead-specifi c ligand. A waste stream sample from a battery plant was subjected to LM-MEUF process in the optimum conditions determined in this study and it was shown that Pb2+  ions in a waste stream could be removed by LM-MEUF effectively.
    Źródło:
    Polish Journal of Chemical Technology; 2018, 20, 2; 80-84
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fabrication of 0.95BaTiO3-0.05Pb(Mg1/3Nb2/3)O3 ceramics by conventional solid state reaction method
    Otrzymywanie ceramiki 0,95BaTiO3-0.05Pb(Mg1/3Nb2/3)O3 metodą konwencjonalną
    Autorzy:
    Nogas-Ćwikiel, E.
    Suchanicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/351657.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    0.95BaTiO3-0.05Pb(Mg1/3Nb2/3)O3
    barium titanate
    BaTiO3
    lead magnesium niobate
    Pb(Mg1/3Nb2/3)O3
    tytanian baru
    niobian ołowiu magnezu
    Opis:
    The possibility to obtain of ceramic solid solution between barium titanate and lead magnesium niobate by two-step sintering technique through conventional solid-state reaction method has been investigated. In the first step MgNb2O6 has been synthesized. In the second step 0.95BaTiO3-0.05Pb(Mg1/3Nb2/3)O3 has been obtained using MgNb2O6, PbO and BaTiO3. The two-step sintering technique is effective for the synthesized of 0.95BaTiO3-0.05Pb(Mg1/3Nb2/3)O3 ceramics. Single-phase (pyrochlore-free) ceramics with perovskite phase were obtained.
    Badano możliwość otrzymania ceramicznego roztworu stałego ty tanianu baru i niobianu ołowiu magnezu metodą reakcji w fazie stałej. Ceramikę otrzymano dwuetapowo. W pierwszym etapie zsyntezowano MgNb2O6. W drugim etapie z 0.95BaTiO3-0.05Pb(Mg1/3Nb2/3)O3 otrzymano 0.95BaTiO3-0.05Pb(Mg1/3Nb2/3)O3. Użyta metoda dwuetapowa okazała się skuteczna dla otrzymania ceramiki 0.95BaTiO3-0.05Pb(Mg1/3Nb2/3)O3. Otrzymano jednofazową ceramikę o strukturze typu perowskitu. bez niepożądanej fazy pirochloru.
    Źródło:
    Archives of Metallurgy and Materials; 2013, 58, 4; 1397-1399
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Znaczenie dla środowiska właściwości buforowych odpadów flotacyjnych i żużli hutniczych przemysłu Zn-Pb w Bukownie
    Environmental significant of buffering capacities of Zn-Pb flotation waste and slags, Bukowno, Poland
    Autorzy:
    Wójcik, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/183581.pdf
    Data publikacji:
    2009
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    odpady Zn-Pb
    utlenianie H2O2
    zdolność neutralizacji zakwaszenia
    Zn-Pb wastes
    H2O2 oxidation capacities
    acid neutralization potential
    Opis:
    Zn-Pb flotation waste and slags contain metal sulphides, which are unstable under oxidizing conditions. Calculations indicate that dumps containing such waste can contaminate ground water with sulphates for time exceeding 130 years. However, the dumps studied containing also buffering minerals dolomite and slags components such as pyroxenes and mellilite which can mediate contamination of the environment. The buffering capacity equals respectively to 15.2 and 3 mol H+/kg.
    Źródło:
    Geologia / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie; 2009, 35, 2/1; 305-311
    0138-0974
    Pojawia się w:
    Geologia / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Batch removal of Pb (ΙΙ) ions from aqueous medium using gamma-Al2O3 nanoparticles/ethyl cellulose adsorbent fabricated via electrospinning method: An equilibrium isotherm and characterization study
    Autorzy:
    Pouya, E. S.
    Fatoorehchi, H.
    Foroughi-Dahr, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/778139.pdf
    Data publikacji:
    2018
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    Adsorption
    Pb (II) ions
    Ethyl cellulose
    Gamma-Al2O3 nanoparticles
    Electrospinning
    Opis:
    The aim of the present work is to study the efficiency of a biocompatible polymer-based adsorbent for the removal of Pb (II) ions whose devastating effects on people’s health is a matter of great concern from aqueous solution. In this study, ethyl cellulose and gamma-Al2 O<3  nanoparticles/ethyl cellulose electrospun adsorbents were prepared for the batch removal of Pb (II) ions from aqueous solution. Both samples were characterized using contact angle analysis, N2 adsorption/desorption technique, FT-IR and SEM. The Freundlich model (R-square = 0.935 and RMSD (%) = 6.659) and the Dubinin-Radushkevich model (R-square = 0.944 and RMSD (%) = 6.145) were found to be more reliable in predicting the experimental data from the adsorption of Pb (II) ions onto the electrospun gamma-Al2 O<3  nanoparticles/ethyl cellulose than the Langmuir model (R-square = 0.685 and RMSD (%) = 14.61) and also the Temkin model (R-square = 0.695 and RMSD (%) = 14.38).
    Źródło:
    Polish Journal of Chemical Technology; 2018, 20, 2; 32-39
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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