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Showing 1 to 20 of 22 for “"thickener"”.
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Rheological Investigations of Latex-Surfactant-Associative Thickener Aqueous Systems
<p>Surfactants and Thickeners are both additives used in fully-formulated waterborne coatings to provide colloidal stability, thickening, and other functionality. The behavior of each ingredient in a coating must be understood and controlled to maintain colloidal stability as well as balance other …
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Syneresis and Rheology Mechanisms of a Latex-HEUR Associative Thickener System
… celluloses (HECs), a type of non-associative thickener that is relatively inexpensive and synthesized from cellulose, which is abundant. However, coatings that are modified with HECs tend to suffer from poor leveling and syneresis (phase separation). HECs have since been replaced with …
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A study of selected control variables for a bottom-fed thickener
… the operational control of continuous bottom-fed thickeners used for the treatment of coal refuse slurries. The three variable parameters were "Feed Flow Rate," "Feed pH," and "Feed Solids Concentration." These three input parameters were studied under three polymeric conditions. The X-ray …
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Effect of Thickener and Lowered Air Density on Spray Drop Formation and Evaporation Rate
Made available in DSpace on 2014-12-11T17:36:09Z (GMT). No. of bitstreams: 1 7412264.pdf: 4133007 bytes, checksum: b96bab0caceb0a58387759b575e3a79c (MD5) Previous issue date: 1973
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The design and commissioning of a laboratory thickener test plant for measurement and control investigations
… and commissioning of a laboratory scale thickener test plant to carry out measurement and control tests under controlled conditions. The laboratory scale thickener simulates the settiling conditions found in full scale high compression thickeners. A review of thickener technology, …
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Phase Behavior and Rheology of Latex, Thickener, Surfactant Mixtures and Liquid Crystal Based Compositions for Printing High-Efficiency Flexible Electronics
… ethoxylated urethane (HEUR) associative thickeners in water. The dispersant was mixed at various concentrations (0-2% by weight) with HEUR thickeners at 1% by weight concentration in the aqueous medium. This study is an integral part of our attempts to determine mechanisms of viscosity …
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Development and Implementation of Dispersion Phase Diagrams (DPDs) for Four Different Hydrophobically Modified Ethoxylated Urethane (HEUR) Based Acrylic Paint Systems
… main components of paint include associative thickeners, surfactants, pigments and fillers with the thickener being the primary area of focus for this study.</p> <p>The relatively simple system of latex, associative thickener and surfactant has been studied extensively. These studies have …
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Alum treatment of caustic wash from chlorine bleached kraft pulp
… kraft pulp, to determine if a double tray Dorr thickener could be used to settle the coagulated waste, and to determine if a centrifugal separator could be used to dewater the sludge from the Dorr underflow. Approximately 5000 gallons of caustic wash from chlorine bleached kraft pulp was used …
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Multi phase numerical modelling of thickening and sedimentation
… predict the performance of a continuous gravity thickener. The various particle species within the particulate susepnsion are represented as separate phases with distinct concentrations and velocities. A multiphase representation of the settling process gives greater detail of the interactions …
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An evaluation of separation methods for the selective coagulation of ultrafine coal
… method based on overall process performance. The thickener was found to be the best method for separating hydrophobic coagula from dispersed mineral matter based on overall process performance (e.g., recovery and grade), unit capacity, and engineering feasibility. Further testing of the thickener …
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Evaluation of Novel Fine Coal Dewatering Aids
… of coals from the Smith Branch Impoundment, thickener underflow, and thickener feed. The coal samples were used initially for laboratory-scale tests using a 2.5-inch diameter Buchner vacuum filter. The results showed that the use of the novel dewatering aids can reduce the cake moisture up to …
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Synthesis and Optimization of Emulsion Polymers
… the syneresis and rheology mechanisms of latex/thickener systems. In addition, this project investigates the optimization of the emulsion polymerization teaching lab used in the Polymers and Coatings masters program. Here, a batch emulsion polymerization process was studied and various particle …
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The liberation characteristics of Greenside No. 2 seam coal
… from a sample of naturally arising fines (thickener underflow). Liberation was assessed by float and sink analysis, and for this purpose a new technique was developed that enables rapid and accurate float and sink analysis of coal down to a few micron in size. Petrographic analyses were …
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An investigation into column flotation of South African coals
… fines which are presently discarded. Samples of thickener underflow fines from the Durnacol, Kleinkopje and Greenside Collieries were used in laboratory column testwork. In addition, on-line column trials were performed at the Kleinkopje Colliery. The effects of co 1 umn operating parameters were …
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Accelerating Liquid Formulation Design using Lab Automation and Machine Learning
… of surfactants, a conditioning polymer, and a thickener; selected from a choice of 18 industrial formulation ingredients. Formulation design typically results in a high-dimensional, mixed nominal-continuous design problem for which there was no suitable design of experiments. I developed a …
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Investigating the effect of water quality on the adsorption of a xanthate collector in the flotation of a sulphide ore
… concluded that of the tested waters, the copper thickener overflow was the least conducive to xanthate adsorption and valuable mineral recovery. On the other hand, collector adsorption was favoured by waters such as the raw and standard process. However, increased adsorption did not necessarily …
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The deterioration of concrete by heterothrophic bacteria and fungi
… delivery system which consisted of the paint thickener, hydroxyethylcellulose. A gel system was found to confer the advantages of an 'artificial' biofllm environment, and improve the chances of colonisation by increasing the residence time of the microorganisms at the surface. The results …
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Hydrophobic-Hydrophilic Separation Process for the Recovery of Ultrafine Particles
… extended to recover the micron-sized REMs from a thickener underflow sample from the LW coal preparation plant, Kentucky. The results showed that the HHS process was far superior to the forced-air flotation process. In one test conducted during the earlier stages of the present study, a …
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Hydrometallurgical processing of nickel sulfides with activated carbon in sulfuric acid medium
… characterization of rougher, cleaner, and thickener tailings generated froma nickel sulfide processing circuit. Here, acid-base accounting, mineralogical analysis, and sequential extraction procedures were employed to evaluate metal speciation, mobility, and acid mine drainage potential. …
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An investigation into the impact of residual reagents on flotation in response to process water recirculation
… operations recycling water from tailing dams, thickener overflow, dewatering and filter products. However, water quality is found to influence the process of ore flotation, the results of various studies investigating the effects of water and recirculating water have seen an adverse effect on …
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