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Normal";mso-tstyle-rowband-size:0;mso-tstyle-colband-size:0;mso-style-noshow:yes;mso-style-priority:99;mso-style-parent:"";mso-padding-alt:0cm 5.4pt 0cm 5.4pt;mso-para-margin-top:0cm;mso-para-margin-right:0cm;mso-para-margin-bottom:10.0pt;mso-para-margin-left:0cm;line-height:115%;mso-pagination:widow-orphan;font-size:11.0pt;font-family:"Calibri","sans-serif";mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin;mso-ansi-language:EN-US;mso-fareast-language:EN-US;}</style><![endif]--><span lang="EN-US" style="font-size:10.0pt;line-height:115%;font-family:&quot;Cambria&quot;,&quot;serif&quot;;mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin;mso-bidi-font-family:&quot;Times New Roman&quot;">Primena različitih tretmana sa ciljem redukcije sadržaja nesaharoznih jedinjenja u melasi &scaron;ećerne repe potencijalan je metod za pobolj&scaron;anje parametara kvaliteta melase, lak&scaron;e sprovođenje procesa desaharifikacije melase i sprečavanje eventualnih nepoželjnih promena pri skladi&scaron;tenju melase. Stoga je predmet istraživanja ove disertacije redukovanje sadržaja nesaharoznih jedinjenja u melasi &scaron;ećerne repe upotrebom prirodnih adsorbenata mineralnog (različiti tipovi bentonita) i celuloznog (celuloza različitog stepena čistoće i modifikovani ekstrahovani rezanci &scaron;ećerne repe) porekla. Variranjem pH vrednosti sredine, suve materije melase i koncentracije primenjenog adsorbenta ispitan je sinergistički efekat uslova tretmana na stepen redukcije sadržaja nesaharoznih jedinjenja u melasi. Efikasnost sprovedenog tretmana utvrđena je na osnovu promena parametara kvaliteta melase i to boje, mutnoće, sadržaja saharoze, sadržaja suve materije i sadržaja pepela. </span></p><p class="MsoNormal" style="text-align:justify"><span lang="EN-US" style="font-size:10.0pt;line-height:115%;font-family:&quot;Cambria&quot;,&quot;serif&quot;;mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin;mso-bidi-font-family:&quot;Times New Roman&quot;">Na osnovu rezultata uočava se da je pozitivan uticaj kombinovanog dejstva upotrebljenih adsorbenata i uslova tretmana najizraženiji kod mutnoće i boje melase &scaron;to potvrđuje afinitet adsorbenata ka zadržavanju i/ili vezivanju bojenih materija. Takođe, navedeni pozitivan uticaj izražen je u manjoj ili većoj meri u zavisnosti od tipa primenjenog adsorbenta ali i uslova gde je uglavnom dominantan uticaj pH vrednosti </span></p><p><!--[if gte mso 9]><xml> <o:OfficeDocumentSettings> <o:RelyOnVML/> <o:AllowPNG/> </o:OfficeDocumentSettings></xml><![endif]--><!--[if gte mso 9]><xml> <w:WordDocument> <w:View>Normal</w:View> <w:Zoom>0</w:Zoom> <w:TrackMoves/> <w:TrackFormatting/> <w:DoNotShowRevisions/> <w:DoNotPrintRevisions/> <w:DoNotShowMarkup/> <w:DoNotShowComments/> <w:DoNotShowInsertionsAndDeletions/> <w:DoNotShowPropertyChanges/> <w:HyphenationZone>21</w:HyphenationZone> <w:PunctuationKerning/> <w:ValidateAgainstSchemas/> <w:SaveIfXMLInvalid>false</w:SaveIfXMLInvalid> <w:IgnoreMixedContent>false</w:IgnoreMixedContent> <w:AlwaysShowPlaceholderText>false</w:AlwaysShowPlaceholderText> <w:DoNotPromoteQF/> <w:LidThemeOther>EN-US</w:LidThemeOther> <w:LidThemeAsian>X-NONE</w:LidThemeAsian> <w:LidThemeComplexScript>X-NONE</w:LidThemeComplexScript> <w:Compatibility> <w:BreakWrappedTables/> <w:SnapToGridInCell/> <w:WrapTextWithPunct/> <w:UseAsianBreakRules/> <w:DontGrowAutofit/> <w:SplitPgBreakAndParaMark/> <w:EnableOpenTypeKerning/> <w:DontFlipMirrorIndents/> <w:OverrideTableStyleHps/> </w:Compatibility> <m:mathPr> <m:mathFont m:val="Cambria Math"/> <m:brkBin m:val="before"/> <m:brkBinSub m:val="&#45;-"/> <m:smallFrac m:val="off"/> <m:dispDef/> <m:lMargin m:val="0"/> <m:rMargin m:val="0"/> <m:defJc m:val="centerGroup"/> <m:wrapIndent m:val="1440"/> <m:intLim m:val="subSup"/> <m:naryLim m:val="undOvr"/> </m:mathPr></w:WordDocument></xml><![endif]--><!--[if gte mso 9]><xml> <w:LatentStyles DefLockedState="false" DefUnhideWhenUsed="true" DefSemiHidden="true" DefQFormat="false" DefPriority="99" LatentStyleCount="267"> <w:LsdException Locked="false" Priority="0" SemiHidden="false" UnhideWhenUsed="false" QFormat="true" Name="Normal"/> <w:LsdException Locked="false" Priority="9" SemiHidden="false" UnhideWhenUsed="false" QFormat="true" Name="heading 1"/> <w:LsdException Locked="false" Priority="9" QFormat="true" Name="heading 2"/> <w:LsdException Locked="false" Priority="9" QFormat="true" Name="heading 3"/> <w:LsdException Locked="false" Priority="9" QFormat="true" Name="heading 4"/> <w:LsdException Locked="false" Priority="9" QFormat="true" Name="heading 5"/> <w:LsdException Locked="false" Priority="9" QFormat="true" Name="heading 6"/> <w:LsdException Locked="false" Priority="9" QFormat="true" Name="heading 7"/> <w:LsdException Locked="false" Priority="9" QFormat="true" Name="heading 8"/> <w:LsdException Locked="false" Priority="9" QFormat="true" Name="heading 9"/> <w:LsdException Locked="false" Priority="39" Name="toc 1"/> <w:LsdException Locked="false" Priority="39" Name="toc 2"/> <w:LsdException Locked="false" Priority="39" Name="toc 3"/> <w:LsdException Locked="false" Priority="39" Name="toc 4"/> <w:LsdException Locked="false" Priority="39" Name="toc 5"/> <w:LsdException Locked="false" Priority="39" Name="toc 6"/> <w:LsdException Locked="false" Priority="39" Name="toc 7"/> <w:LsdException Locked=&qu / <p>&nbsp;</p><p class="MsoNormal" style="text-align:justify"><span lang="EN-US" style="font-size:10.0pt;line-height:115%;font-family:&quot;Cambria&quot;,&quot;serif&quot;;mso-fareast-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;">The application of different treatments aiming to reduce the content of non-sugar compounds in sugar beet molasses is a potential method for molasses quality enhancement, facilitation of molasses desugarization process and prevention of any undesirable changes during molasses storage. Therefore, the objective of this dissertation is to reduce the content of non-sugar compounds in sugar beet molasses by using natural adsorbents of mineral (different types of bentonite) and cellulosic (cellulose of different purity and modified sugar beet pulp) origin. By varying treatment conditions such as pH, molasses dry substance and the applied adsorbent concentration, the synergistic effect of the treatment conditions on the reduction efficiency of non-sugar compounds content in molasses was examined. The treatment effectiveness was determined based on changes in molasses quality parameters, namely color, turbidity, sucrose content, dry substance content and ash content.</span></p><p><!--[if gte mso 9]><xml> <o:OfficeDocumentSettings> <o:RelyOnVML/> <o:AllowPNG/> </o:OfficeDocumentSettings></xml><![endif]--></p><p><!--[if gte mso 9]><xml> <w:WordDocument> <w:View>Normal</w:View> <w:Zoom>0</w:Zoom> <w:TrackMoves/> <w:TrackFormatting/> <w:DoNotShowRevisions/> <w:DoNotPrintRevisions/> <w:DoNotShowMarkup/> <w:DoNotShowComments/> <w:DoNotShowInsertionsAndDeletions/> <w:DoNotShowPropertyChanges/> <w:HyphenationZone>21</w:HyphenationZone> <w:PunctuationKerning/> <w:ValidateAgainstSchemas/> <w:SaveIfXMLInvalid>false</w:SaveIfXMLInvalid> <w:IgnoreMixedContent>false</w:IgnoreMixedContent> <w:AlwaysShowPlaceholderText>false</w:AlwaysShowPlaceholderText> <w:DoNotPromoteQF/> <w:LidThemeOther>EN-US</w:LidThemeOther> <w:LidThemeAsian>X-NONE</w:LidThemeAsian> <w:LidThemeComplexScript>X-NONE</w:LidThemeComplexScript> <w:Compatibility> <w:BreakWrappedTables/> <w:SnapToGridInCell/> <w:WrapTextWithPunct/> <w:UseAsianBreakRules/> <w:DontGrowAutofit/> <w:SplitPgBreakAndParaMark/> <w:EnableOpenTypeKerning/> <w:DontFlipMirrorIndents/> <w:OverrideTableStyleHps/> </w:Compatibility> <m:mathPr> <m:mathFont m:val="Cambria Math"/> <m:brkBin m:val="before"/> <m:brkBinSub m:val="&#45;-"/> <m:smallFrac m:val="off"/> <m:dispDef/> <m:lMargin m:val="0"/> <m:rMargin m:val="0"/> <m:defJc m:val="centerGroup"/> <m:wrapIndent m:val="1440"/> <m:intLim m:val="subSup"/> <m:naryLim m:val="undOvr"/> </m:mathPr></w:WordDocument></xml><![endif]--></p><p class="MsoNormal" style="text-align:justify"><span lang="EN-US" style="font-size:10.0pt;line-height:115%;font-family:&quot;Cambria&quot;,&quot;serif&quot;;mso-fareast-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;">According to the obtained results, the positive influence of the combined effect of applied adsorbents and treatment conditions is most pronounced for molasses quality parameters turbidity and colour, which confirms the applied adsorbents affinity towards coloured compounds retention or binding. Also, the stated positive influence is expressed to a greater or lesser extent depending on the type of adsorbent used as well as the conditions applied, where the influence of pH is mainly dominant.</span></p><p><!--[if gte mso 10]><style> /* Style Definitions */ table.MsoNormalTable{mso-style-name:"Table Normal";mso-tstyle-rowband-size:0;mso-tstyle-colband-size:0;mso-style-noshow:yes;mso-style-priority:99;mso-style-parent:"";mso-padding-alt:0cm 5.4pt 0cm 5.4pt;mso-para-margin-top:0cm;mso-para-margin-right:0cm;mso-para-margin-bottom:10.0pt;mso-para-margin-left:0cm;line-height:115%;mso-pagination:widow-orphan;font-size:11.0pt;font-family:"Calibri","sans-serif";mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin;mso-ansi-language:EN-US;mso-fareast-language:EN-US;}</style><![endif]--></p><p><!--[if gte mso 9]><xml> <o:OfficeDocumentSettings> <o:RelyOnVML/> <o:AllowPNG/> 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Electricity generation at nuclear power plants produces a large amount of high-level radioactive waste (HLW) every year, which has long-term detrimental effects on humans and the environment. Other applications of nuclear technology (e.g., medicine, research, nuclear weapons, industry) also produce radioactive waste (e.g., low-level radioactive waste, LLW, Intermediate-level waste, ILW). The potential of deep geological repositories (DGRs) as an option for disposal of radioactive waste (HLW, ILW, LLW) has been examined in several countries, including Bulgaria, Canada, China, Finland, France, Germany, India, Japan, Russia, Spain, Sweden, Switzerland, Ukraine and the United Kingdom and are still under discussion. In Ontario, Canada, DGRs with a multi-barrier system comprised of a sedimentary rock formation (i.e., a natural barrier) and an engineered barrier system (EBS) are currently under consideration. An EBS consists of various components, such as waste containers, buffer, backfill, and tunnel sealing materials, intended to prevent the release of radionuclides. Several engineered barrier materials, including a mixture of bentonite and sand, are currently being considered for use in DGRs for nuclear waste in Ontario. Bentonite has some advantageous physical and chemical properties, such as low permeability, high plasticity, and high swelling potential, which provide it with a good sealing ability and thus make it an effective barrier. However, interaction between the compacted bentonite–sand mixture and underground water chemistry fluids (chemical factor) in the DGR could significantly alter the favourable properties of bentonite (e.g., swelling potential), thus influencing its performance when used in an EBS and eventually jeopardizing the overall safety of DGRs. In addition, other parameters, such as the clay content, initial dry density and moisture content of the compacted barrier (physical factors), as well as the presence of salts in groundwater may affect the physical and physiochemical properties of barrier materials. Moreover, during the lifetime of a DGR for used spent fuel, the bentonite–based barrier material will not only be exposed to a broad range of groundwaters with different chemical compositions, but also to high temperatures (heat generated by the nuclear wastes) (thermal factor). Thus, the interaction between the compacted bentonite–sand mixture, the surrounding groundwater and the heat from the nuclear waste material could jeopardize the favourable properties of the bentonite-based (bentonite-sand) barrier material. Properties of a bentonite-sand barrier is an important characteristic to study while designing and constructing an EBS for a DGR. Thus, to understand and assess the operations of DGRs in Ontario, comprehensive studies must be performed on engineering properties like swelling behaviour, permeability, and thermal conductivity. The goal of this research study is to experimentally investigate the physical, chemical and thermal factors that influencing the engineering properties of a barrier material made up of bentonite-sand composite used in DGRs for nuclear waste in Ontario. Compacted samples are subjected to one-dimensional free swell test to understand the swelling behaviour of the material. Hydraulic conductivity was investigated using a flexible wall permeability test. Thermal conductivity and diffusivity were tested using Decangon KD2 Pro with TR-1 and and KS-1 sensors. The specimens contain different bentonite–sand mixture ratios (20:80, 30:70, 50:50, and 70:30 dry mass), and they are tested under conditions with differing bentonite content, dry density, groundwater chemistry, and temperature. Additional tests were conducted to investigate the microstructure of the specimens. These tests include X-ray diffraction (XRD) analysis, mercury intrusion porosimetry (MIP), and thermogravimetric analyses (TG/DTG). The results reveal that the time and strain required to achieve maximum swelling of compacted bentonite–sand specimens increase with the increase of initial dry density. The simulated saline solutions of Guelph and Trenton groundwater are found to suppress the swelling of the bentonite–sand specimens. This in turn leads to the increase of hydraulic conductivity and decrease of thermal properties of the barrier material. However, the impact of the salinity is significantly reduced by increasing the dry densities and sand content of the compacted material. Moreover, the coupled effect of salinity and temperature decreases the swelling potential of the bentonite-sand mixture. Also, some transformation of Na-montmorillonite into Ca-Montmorillonite was observed. The results also indicate that some montmorillonites might have been transformed into illites, thereby further decreasing the swelling potential of the bentonite-based barrier.

No description available.

The effects of crop load and berry exposure on the composition of Marlborough Sauvignon blanc grapes and wine from the Brancott vineyard, Blenheim, were explored. Commercially grown, 2-cane and 4-cane Sauvignon blanc vines were used with a row orientation of north-south. Two exposure treatments were imposed in the following manner: complete leaf removal was undertaken in the fruit zone and 50% shade cloth was erected to give a uniform shading treatment to half the trial vines. Weekly thirty-berry and whole bunch samples were taken from each of the 32 plots with the exception of the veraison period when two samples per week were taken. Vine vigour was assessed using pruning and leaf area per vine data. Harvest occurred on different dates for 2-cane and 4-cane pruned vines so that fruit attained from both treatments had similar °Brix. Fruit was processed at the Lincoln University winery. Must analysis and wine analysis were undertaken. As expected, 4-cane vines had almost double the yield of 2-cane vines. Higher crop load significantly reduced leaf area per shoot and shoot thickness. Lower leaf area to fruit ratio for 4-cane berries resulted in delayed onset of veraison and slowed the rate of sugar accumulation. Crop load, which limited leaf area to fruit ratio, appeared to be the dominant factor in determining timing of grape physiological ripeness as expressed by °Brix over other factors such as fruit exposure. Malic acid, tartaric acid, IPMP (iso-propylmethoxypyrazine) and IBMP (iso-butyl-methoxypyrazine) were lower at equivalent °Brix in 4-cane compared with 2-cane berries. Significantly higher concentrations of quercetin were found in exposed compared to shaded berries. Must analysis showed a significant influence of crop load on berry titratable acidity and pH, reflecting berry ripening results. Exposure significantly increased the concentrations of nitrogenous compounds in 4-cane must yet showed no influence on 2-cane must. After wine processing lower malic acid concentrations in wines made from 100% exposed fruit became evident in lower wine titratable acidity but showed no influence on wine pH. Bentonite addition to wines had a small but statistically significant influence on wine by reducing pH, titratable acidity and alcohol. Bound sulphur concentrations were significantly higher in 4-cane versus 2-cane wines. At harvest, methoxypyrazine levels in grapes and wines were very low; IBMP concentrations where significantly lower than those normally found in Sauvignon blanc wines from Marlborough. This was attributed to the absence of basal leaves from the shoots of ripening berries. The results suggest that leaf area to fruit ratio is a powerful determinant of grape and wine quality.

Dans le cadre de l'étude de faisabilité du stockage en formation argileuse profonde, la disponibilité de l'eau dans les argiles doit être connue. Le statut de l'eau dans un milieu poreux particulier conditionne en effet l'interprétation de nombreuses expériences : altération géochimique, rétention, thermo–hydro–mécanique, modélisations géochimiques, ... . Pour répondre aux préoccupations reliées à la diffusion des polluants à travers des milieux poreux, il est fondamental de décrire correctement les états de l'eau, vecteur des transports. Le but de cette étude est également de clarifier les notions "d'eau libre" et "d'eau liée". <br />Les spectroscopies de vibration sont appliquées à l'étude des états d'hydratation de saponites synthétiques, (Si4-xAlx)Mg3O10(OH)2Mz+x/z, afin de caractériser les molécules d'eau adsorbées et les conséquences de cette adsorption sur la structure des matériaux. La réalisation de ce projet a nécessité la conception, la réalisation et la validation d'un montage expérimental original ; il permet d'enregistrer des spectres proche infrarouge en réflexion diffuse et des spectres de diffusion Raman, les échantillons étant maintenus à température (30°C à 80°C) et pression de vapeur d'eau contrôlées (10-6 < P/P0 < 0,98). Par l'analyse approfondie des spectres proche infrarouge, des isothermes d'adsorption -désorption d'eau sont obtenues et se révèlent être en parfait accord avec les techniques gravimétriques quantitatives, en plus des informations sur les états de l'eau à l'échelle moléculaire. <br />L'étude concomitante des spectres de vibration et une approche pluridisciplinaire originale (Diffraction de Rayons X et de neutrons, Analyse Thermique à Vitesse Contrôlée, gravimétrie d'adsorption d'eau et simulations Grand Canonique Monte Carlo) permet de décrire les mécanismes de l'hydratation ainsi que la localisation et l'organisation des molécules d'eau dans l'espace interfoliaire des saponites. Grâce à la diversité des échantillons synthétiques – deux charges (x=0,4 ou 0,7) et trois cations compensateurs (Mz+x/z=Na+ ou K+ ou Ca2+) –, il est possible d'établir l'influence des paramètres charge et nature du cation compensateur sur l'hydratation. Le cation se révèle alors être l'acteur principal de la structuration de l'eau dans l'espace interfoliaire et du gonflement ; par exemple, le potassium K+ s'avère très difficile à extraire de sa cavité ditrigonale lors de l'hydratation, à tel point que, pour la charge x=0,7, il reste localisé au niveau de la substitution au-delà de P/P0=0,90. La conséquence directe sur la quantité d'eau adsorbée est que, à P/P0=0,40 par exemple, la saponite 0,7 K adsorbe quatre fois moins de molécules d'eau que le même échantillon échangé au sodium. Ensuite, l'étude de l'effet de la température sur l'hydratation des saponites sodiques tend à montrer que le film d'eau interfoliaire reste structuré en deux dimensions jusqu'à plus de 95% d'humidité relative à 80°C alors que le passage à un réseau tridimensionnel est observé dès 60% d'humidité relative à 30°C. Une autre conséquence est qu'à P/P0=0,80, la quantité d'eau adsorbée par un même échantillon est trois fois plus grande à 30°C qu'à 80°C. Après avoir extrait les mécanismes et les paramètres principaux de l'hydratation des saponites, l'hydratation d'une argile méthodologique de l'Andra, la bentonite MX80, est également étudiée. L'accent est mis sur l'importance des phases minérales accessoires de cette argile naturelle qui représentent environ 20% en masse. Notamment, la composition en cations de l'espace interfolaire n'est pas à l'équilibre avec les minéraux extérieurs aux particules de smectite ; un enrichissement de l'espace interfoliaire en cations divalents (Ca2+ et/ou Fe2+) est mis en évidence en présence de vapeur d'eau. Les phases accessoires modifient également la porosité intergranulaire et, par conséquent, la quantité d'eau adsorbée à des P/P0 supérieurs à 0,80 varie entre la phase smectique et la bentonite. Enfin, l'acquisition de nombreux spectres de l'eau a nécessité le développement d'une méthode simple de traitement des profils spectraux. Reposant sur la mesure du barycentre du massif d'absorption des combinaisons de l'eau, elle permet de différencier deux types d'eau tout en les quantifiant ; de l'eau adsorbée sur les cations à haut nombre d'onde et de l'eau engagée dans un réseau de liaisons hydrogène appelée eau auto-associée, à plus bas nombre d'onde. Il apparaît que, jusqu'aux alentours de 0,6 en P/P0, c'est l'eau des cations qui est majoritaire. Au-delà, l'eau auto-associée augmente fortement jusqu'à devenir prédominante, la quantité d'eau sur les cations restant quasi-constante.

Afin d'assurer le confinement de déchets radioactifs en milieu géologique profond, il est envisagé d'utiliser des matériaux argileux de site et des bentonites. Leur stabilité en présence de fer métal, constituant des conteneurs de déchets, est étudiée. Ces études démontrent que la réactivité de tels matériaux est principalement portée par les smectites dioctaédriques et les kaolinites qu'ils contiennent. En revanche, la présence de sulfures inhibe la réaction Fe(0)-argiles. La nature du produit de réaction dépend de la quantité de fer métal disponible. A pH basique, par contact physique avec les agents oxydants de la smectite (H+, OH- et Fe3+), le Fe(0) est corrodé. Cette réaction est favorisée par les hétérogénéités des surfaces latérales de la smectite, qui altérée définit un micro-domaine à l'intérieur duquel nucléent des serpentines-Fe si l'apport en fer est suffisant. De telles néoformations entrainent une diminution des propriétés de confinement de la barrière argileuse.

Les smectites en suspension aqueuse sont des argiles gonflantes largement utilisées dans l'industrie pour leurs capacités d'adsorption, d'étanchéité, de transport ou de liant. Ces propriétés sont inégales en fonction des caractéristiques minéralogiques et physico-chimiques des suspensions. Ce travail a pour but de comprendre l'action de la charge interfoliaire sur les structures construites par le système eau argile en fonction de la concentration pour des smectites homoioniques ou mixte. Son originalité est de coupler des méthodes minéralogiques, physico-chimiques et une large gamme d'essais rhéométriques.<br />Deux populations de smectites (Na+ et Ca2+) sont étudiées séparément puis en mélange. A faible concentration (inférieure à 60 g/l), les suspensions sodiques sont très visqueuses car les feuillets dispersés forment des réseaux. Les feuillets de smectite calcique sont associés en flocs aisément déformables rendant les suspensions peu visqueuses et rhéofluidifiantes. En mélange, les deux populations interagissent faiblement, lorsque le cortège d'échange d'équilibre est atteint (20 % de sodium), les viscosités sont minimales.<br />A plus forte concentration (60 à 100 g/l), les courbes d'écoulement permettent de différencier un domaine de déformation viscoélastique, un domaine d'écoulement hétérogène (bandes de cisaillement) et un domaine d'écoulement homogène. L'étude de la thixotropie révèle l'existence de deux cinétiques de déstructuration/restructuration.<br />L'étude de 12 bentonites brutes permet de monter que la rhéomètrie est un bon moyen de différenciation entre les bentonites sodique naturelle (Herschel-Bulkley), calcique naturelle (Newton) ou calcique activée (Bingham).

Poor settling of solids increases land requirement for tailings containment and imposes severe constraints on the water balance. Consequent to these considerations, the alternating current electrocoagulation (AC/EC) technique emerged as a candidate for enhancing the settling behaviour of suspensions in the mineral, coal and oil sands industries. Hence, a fundamental study of AC/EC was undertaken with aluminum electrodes. Ground silica (d50 = 20 m), which formed a stable suspension, served as the model tailings solid at 5.0 wt % in water. The AC/EC process consisted of two developmental stages: coagulation, marked by pH decrease in the silica suspension; and floc growth, characterized by pH increase from the minimum (i.e., the end of coagulation). AC/EC enhanced the initial settling rate of silica by over three orders of magnitude, and exhibited remarkable flexibility by virtue of the wide range of process parameters that could be optimized. For example, AC/EC can be operated in either the indirect or direct mode. The settling behaviour of bentonite (estimated d50 < 1 m) was more enhanced by indirect AC/EC, while that of silica benefited more from direct AC/EC. Any condition that increased aluminum dosage (e.g., current, retention time), increased the initial settling rate of silica. Over the feed water pH range of 3.0 to 9.1, AC/EC was effective in enhancing the settling behaviour of silica. AC/EC was also effective over a wide range of temperatures (23 to 85C). High electrical energy demand by AC/EC was observed throughout this study. Its optimization was beyond the scope of this work. Dilution of a sample of Syncrude mature fine tailings (MFT) to 4.6 wt % solids sustained a stable suspension. Settling occurred after AC/EC treatment, a crystal-clear supernatant resulted and bitumen was recovered as froth. Entrained solids were easily spray-washed from the froth with water. The settling behaviour of a Luscar Sterco fine coal tailings sample was not augmented by AC/EC, possibly due to contamination by the companys own electrocoagulation operation. After having been stored dry for more than a year, electrocoagulated silica was an effective coagulant for as-received silica and Syncrude MFT. / Chemical Engineering

No description available.

No description available.