dispersant carbonate de calcium

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Preparation and property analysis of polyacrylate dispersant
2008.9.1 Dispersant-B and SN5040 were the suitable dispersants for the dispersion of nanometer calcium carbonate. The grinding experiment of 325-mesh calcium carbonate revealed a logarithmic relation between the weight percentage of fine particles and the
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(PDF) Dispersion, Stabilisation and Casting of
1997.4.1 Dispersion, Stabilisation and Casting of Calcium Carbonate Suspensions Authors: Giuliano Tari BBA British Board of Agrément S.
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Dispersive and filter loss performance of calcium carbonate ...
2021.9.6 The contact angle of unmodified calcium carbonate nanoparticles is 25.18°, while the contact angle of modified calcium carbonate nanoparticles is only 14.75°. The
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Preparation and property analysis of polyacrylate dispersant for ...
2008.9.1 Two types of dispersants for calcium carbonate were synthesized by condensation polymerization. One was the acrylic homopolymer (Dispersant-A), and the
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Dispersing agent for calcium carbonate and ... - Semantic
2011.6.28 The present invention relates to: a dispersant for calcium carbonate, which can produce a calcium carbonate slurry having a reduced initial viscosity by wet-grinding
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WO/2012/008294 DISPERSANT DE CARBONATE DE CALCIUM ET PROCÉDÉ DE ...
2011.6.27 Le dispersant de carbonate de calcium contient un polymère acrylique ayant un poids moléculaire moyen en poids entre 4500 et 8500 qui est obtenu par : une
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Coatings Free Full-Text Synthesis of CaCO3
2023.3.18 Abstract. As an essential pigment particle in white water-based coatings, light calcium carbonate (CaCO 3) is difficult to disperse in water-based systems. The hard-to-disperse particles agglomerate,
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Biomineralization of calcium carbonates and their
2013.10.29 Microbially induced calcium carbonate precipitation (MICCP) is a naturally occurring biological process in which microbes produce inorganic materials as part of
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Acrylic Acid-Allylpolyethoxy Carboxylate Copolymer Dispersant
2012.5.1 Acrylic Acid-Allylpolyethoxy Carboxylate Copolymer Dispersant for Calcium Carbonate and Iron (III) Hydroxide Scales in Cooling Water Systems. Acrylsäure
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Production of a Highly Concentrated CaCO3 Suspension by
2007.2.2 This article presents the study of the cross‐flow microfiltration of an aqueous calcium carbonate suspension in the presence of dispersant in order to obtain the highly
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Preparation and property analysis of polyacrylate dispersant
2008.9.1 Furthermore, Dispersant-B and SN5040 are found to be the suitable dispersants for the dispersion of nanometer calcium carbonate. The grinding experiment of 325-mesh calcium carbonate reveals a linear relation between log tgrind and the weight percentage of fine particles, i.e. w (≤2 μm) or w (≤1 μm). Moreover, a power function is
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Synthesis and application of a polyacrylate dispersant on the ...
2014.11.1 Zhang et al. [16] synthesized a polyacrylic polymer dispersant modified by sulfonic acid groups, and applied it to the wet ultrafine grinding of calcium carbonate powder to obtain a very good grinding effect. Garcia et al. [17] applied sodium polystyrene sulfonate in to the wet ultrafine grinding of calcite particles.
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Synthesis of sodium polyacrylate copolymers as water
2021.2.5 Dispersant PMASH 1 used for grinding the pigment particles for 120 min gives an increased product fineness with a narrower particle size distribution. ... Synthesis and application of a polyacrylate dispersant on the preparation of ultrafine ground calcium carbonate in a laboratory stirred media mill. Powder Technol., 266 (2014), pp. 218-227.
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Preparation and property analysis of polyacrylate dispersant for ...
2008.9.1 Two types of dispersants for calcium carbonate were synthesized by condensation polymerization. One was the acrylic homopolymer (Dispersant-A), and the other was copolymer of acrylic acid with unsaturated esters (Dispersant-B). For the former, the optimal synthesizing parameters were determined: ammonium persulfate of 4.0% as
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Effects of calcium chelation on the neutralization of milk
2020.12.1 Moreover, sodium carbonate and citrate after neutralization did not only chelate calcium in serum phase but also from CCP as reported previously (de Kort et al., 2011, Power et al., 2019). Thereby, the dissociation of CCP resulted from the calcium sequestration potentially contributed to the improved rehydration of MPI samples, which
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US4175066A - Dispersant for calcium carbonate - Google
2023.10.8 calcium carbonate salt copolymer molecular weight aqueous dispersion Prior art date 1977-04-18 Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US05/893,696
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Effects of sodium tripolyphosphate and sodium carbonate
2011.8.1 However, use of STPP to replace sodium carbonate can significantly increase the A/S of flocculate separation performance, with the Al 2 O 3 recovery and A/S of the flocculate being approximately 90% and 8.8, respectively. These results show that in the presence of calcium ions the selectivity of PAAS can remain high when using STPP as a
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US4509987A - Calcium carbonate dispersions - Google Patents
Concentrated (e.g. above 72% by weight) dispersions of calcium carbonate ground to a particle size such that at least 87% by weight of the particles are less than 2 μm in size have a tendency to gel on standing. In the invention this tendency is minimized or eliminated by using, as dispersing agent, a copolymer of from 5 to 75% by weight AMPS and 95 to
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Effect of pH on the efficiency of sodium hexametaphosphate as calcium ...
2020.10.1 Calcium carbonate (CaCO 3) scale deposition causes serious issues in industries which deal with water, and its formation reaction is pH-depending. This study investigated the efficiency of sodium hexametaphosphate (SHMP) as scale inhibitor for calcium carbonate, as a function of pH and SHMP concentration, under drastic
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Géo-ingenierie : comment refroidir la planète rapidement
Des géo-ingénieurs envisagent de réduire le réchauffement climatique en dispersant dans l'atmosphère des particules réfléchissant la lumière dans l'espace.
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Dispersion of CaCO3 nanoparticles by sonication and
2013.6.11 This research aims to offset the negative effects of fly ash on the early-age properties of cementitious materials with the use of calcium carbonate (CaCO3) nanoparticles. The main focus is to enhance the effect of the nanoparticles by improving dispersion through ultrasonication and use of surfactants. CaCO3 aqueous suspensions
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Rhéologie des phases aqueuses — Wikipédia
2023.12.25 Deux types de dispersants existent : les dispersant ioniques, et les dispersants stériques. Les dispersants ioniques Les dispersants ioniques sont des sels qui précipitent à la surface des particules en suspensions. ... Les dispersants de minéraux comme le carbonate de calcium, ou les oxydes (oxyde de fer, chaux, dioxyde de titane,
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Introduction to Additives, Part 4: Dispersants - PCI
2021.12.14 The opposite is true for solvent and 100%-solids based systems. Because of this, choosing the correct structure and HLB of the dispersant is critical to a stable dispersion. For example, a dispersant for
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Calcium carbonate powder, particle size = 50um, 98 471-34-1
General description. Calcium Carbonate (CaCO 3) is a naturally found material in chalk, limestone, and marble. It is composed of three elements which include carbon, oxygen, and calcium. It is formed by reacting carbon dioxide with slaked or burnt lime. It can be used for a variety of applications ranging from industrial, food to agriculture.
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A new method for determining the optimum dispersant concentration
2002.3.11 In order to select a good dispersant for the calcium carbonate powder, a fresh 43% by weight suspension was prepared. The automatic titration software was then programmed to add a fixed amount of dispersant in multiples of 0.3 ml up to a total volume of 4–5 ml. The three dispersants chosen were Dispex A40 (a 40% solution of ammonium ...
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Study of Filtration/Liquefaction of Calcium Carbonate
2004.1.1 This work presents the study of filtration of calcium carbonate aqueous suspensions in the presence of a dispersing agent. Two methods were used in this investigation. According to the first method, the dispersing agent was added to the calcium carbonate suspension and the filtration of this suspension was carried out in a single stage.
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Dispersing agent for calcium carbonate and ... - Semantic
2011.6.28 The present invention relates to: a dispersant for calcium carbonate, which can produce a calcium carbonate slurry having a reduced initial viscosity by wet-grinding and can prevent the significant increase in viscosity of the slurry over time; and a process for continuously producing the dispersant. This dispersant for calcium carbonate is produced
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Acrylic Acid-Allylpolyethoxy Carboxylate Copolymer Dispersant
2012.5.1 A novel environmentally friendly type of calcium carbonate and iron(III) scale inhibitor (ALn) was synthesized. The anti-scale property of the Acrylic acid-allylpolyethoxy carboxylate copolymer (AA-APELn or ALn) towards CaCO 3 and iron(III) in the artificial cooling water was studied through static scale inhibition tests. The observation shows
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The effect of DTPA on calcium carbonate scale
2020.3.1 Calcium carbonate (CaCO 3) scale inhibition by Diethylenetriaminepentaacetic acid (DTPA) on copper and aluminium metal surfaces was studied at 60 and 100 °C. The samples were characterized using X-ray diffraction (XRD), Scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy
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Manufacturing method of dispersant for preparing calcium carbonate
PURPOSE: A method for preparing a dispersant is provided, to obtain the sodium polyacrylate with an average molecular weight of 2,800-3,800 useful for the production of calcium carbonate slurry. CONSTITUTION: The method comprises the steps of polymerizing acrylic acid in a solvent in the presence of a catalyst to prepare an acryl polymer; and
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Water Handbook - Deposit And Scale Control
2 天之前 Chapter 25 - Deposit And Scale Control-Cooling System. System scaling and deposition can cause many problems within your operation. Learn more about Veolia's deposition and scale control chemicals .
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US4175066A - Dispersant for calcium carbonate - Google
2023.2.12 calcium carbonate salt copolymer molecular weight aqueous dispersion Prior art date 1977-04-18 Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US05/893,696
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Scale Inhibitors for Industrial Circulating Water Systems: A
2022.2.3 The effects of calcium carbonate and calcium sulfate resistance can reach up to 90% at doses of 15 mg/L and 10 mg/L respectively. Other Natural Organic Scale Inhibitors. ... N. and De Leeuw, N.H., Molecular dynamics simulation of the early stages of nucleation of hydroxyapatite at a collagen template, Cryst. Growth Des., 2012, vol. 12, ...
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Dispersing Agent - an overview ScienceDirect Topics
Addition of dispersant reduces or removes agglomerates that could otherwise have led to cracks. ... (above about 1 micron) disperse perfectly, whereas particles smaller than that tended to agglomerate. Nano calcium carbonate with a datasheet particle size of 70 nm actually formed agglomerates larger than 100 microns in diameter (Figures 25.7 ...
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Factors to Consider in Selecting a Dispersant for Treating
2021.4.1 Poly-B. Figure 1 illustrates that further increasing the dispersant concentration from 0.5 to 1.0 ppm only shows marginal improvement. Therefore, a thorough evaluation is necessary in selecting a dispersant for developing a formulated product to achieve optimum performance. From a practical point of view, the ability of a dispersant
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ACUMER™ 9000 Mineral Slurry Dispersant - Dow
2023.5.16 Mineral Slurry Dispersant . ACUMER™ 9000 is a sodium salt of an acrylic acid-based polymer. It is a highly effective dispersant for aqueous calcium hydroxide and magnesium hydroxide slurries. Description • Controlling phase separation • Reducing caking and clogging of equipment • Aiding the remixing of slurries after settling
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Carbonate Stimulation Using Chelating Agents: Improving
2022.3.1 Moreover, calcium carbonate at different concentrations was dissolved in 18.5 wt % Na 2 EDTA, 20 wt % Na 3 HEDTA, and 20 wt % Na 5 DTPA chelating agents to develop the relationship between the calcium carbonate concentration and the fluid density. It was found that the chelated calcium ions increased the density of the solution as
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US4175066A - Dispersant for calcium carbonate - Google
calcium carbonate salt copolymer molecular weight aqueous dispersion Prior art date 1977-04-18 Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US05/893,696 Other ...
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WO/2012/008294 DISPERSANT DE CARBONATE DE CALCIUM ET PROCÉDÉ DE ...
2011.6.27 Le dispersant de carbonate de calcium contient un polymère acrylique ayant un poids moléculaire moyen en poids entre 4500 et 8500 qui est obtenu par : une étape de polymérisation dans laquelle un monomère comprenant de l'acide acrylique est polymérisé à une température de réaction entre 68 et 82ºC en présence de 1,4 à 4,4
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Rhéologie de suspensions concentrées de carbonate de
2023.6.29 Rhéologie de suspensions concentrées de carbonate de calcium en présence de fluidifiant Romain Morini To cite this version: Romain Morini. Rhéologie de suspensions concentrées de carbonate de calcium en présence de fluidifiant. Autre [cond-mat.other]. Université Nice Sophia Antipolis, 2013. Français. NNT: 2013NICE4111.
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