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Fabrication of submicron barium sulfate aggregates in the presence of ethylenediaminetetraacetic acid anions

Particuology 2015年第5期13卷 157-162页

作者： Linna Hu Guangxiu Wang Chun Yang Rong Cao School of Chemical Engineering and Technology Hebei University of Technology Baoding Lucky Innovative Materials Co. Ltd.

barium sulfate aggregates with an average size of 0.5μm were synthesized at pH 7, directed by ethylenediaminetetraacetic acid （EDTA） anions. The particle morphology, chemical composition, and size distribution of the BaSO4 aggregates were characterized. The as-synthesized BaSO4 particles were spherical and comprised many interconnected nanoballs, of which the surface properties were affected by the EDTA anions. The adsorption of EDTA anions reversed the charge and weakened the surface polarity of BaSO4, instigating the formation of aggregates by a self-assembly and transformation process. The resulting BaSO4 particles at pH 9-10 were ellipsoidal and featured smooth surfaces. Based on the zeta potential of BaSO4, variations in the morphology induced by changes in pH were closely related to the adsorption of mono- and multi-valent anions onto the electrical double layer of BaSO4.

关键词： barium sulfate EDTA anion Particle morphology Self-assembly pH value

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EDTA-type Polymer Based on Diazacrown Ether as the Solubilizer of barium sulfate to Water

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Chinese Chemical Letters 2005年第1期16卷 27-30页

作者： BoZHOU JianZhangLI ChunHongHE ShengYingQIN TheFacultyofChemistry SichuanUniversityChengdu610064

The EDTA dianhydride reacted with diazacrown ethers to obtain the water-soluble EDTA-diazacrown ether polymers 1~3. The effects of crown ether ring in the polymer chains including its cavity size on the solubilization of barium sulfate to water were investigated by comparison with the crown ring-free analogue 4. The result shows that the polymer 2 is the efficient solubilizer of BaSO4 and the highest solubilization efficiency of the BaSO4to water is up to 72.5%.

关键词： EDTA-diazacrown ether polymers barium sulfate solubilization.

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Surface Modification of barium sulfate Particles

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Materials Sciences and Applications 2021年第1期12卷 1-14页

作者： Jérémy Longlade Christelle Delaite Anne-Sophie Schuller Laboratoire de Photochimie et d’Ingénierie Macromoléculaires Université de Haute Alsace (UHA) Mulhouse Cedex France

In this study, surface modification of barium sulfate was investigated using several model molecules for chemical treatment: ethanesulfonic acid, butyric acid, trimethoxy(propyl) silane and phosphoric acid 2-hydroxyethyl methacrylate. Samples were characterized by FT-IR and TGA to check the capability of these model molecules to interact with BaSO4 surface. The results pointed out the presence of an organic layer around the surface after the chemical treatment even after several washings to remove all species in excess. Model molecules were grafted onto BaSO4 surface and grafted density was determined. It reveals that phosphoric acid and carboxylic acid are the best candidates for the modification of BaSO4 surface. Both can be used as anchoring groups to modify the hydrophilic balance of barium sulfate surface in order to avoid the formation of aggregates and to improve the compatibility of this filler within hydrophobic polymer matrix.

关键词： barium sulfate Surface Modification Grafted Density

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Effect of BaSO_(4) on phase composition and sintering process of iron ore fines

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Journal of Iron and Steel Research(International) 2022年第3期29卷 408-417页

作者： Jian-tao Ju Chen-mei Tang Guang-heng Ji Xiang-dong Xing Gui-qing Zhao Xin-tai Jiang Feng-lin Lu School of Metallurgical Engineering Xi’an University of Architecture and TechnologyXi’an710055ShaanxiChina Research Center of Metallurgical Engineering and Technology of Shaanxi Xi’an University of Architecture and TechnologyXi’an710055ShaanxiChina JISCO Iron and Steel Research Institute Jiayuguan735100ShaanxiChina

Iron ore containing BaSO_(4) may have a series of effects on the quality of the sinter and performance of the blast furnace.Thus,the effect mechanism of BaSO_(4)(0-6.0 mass%)on the compressive strength,mineral composition,and microstructure of the sinter was investigated.The experimental results show that the compressive strength of the sintered samples initially increases and then decreases when the BaSO_(4) content increases from 0 to 6.0 mass%,reaching a peak value of 12.78 kN with a BaSO_(4) content of 1.0 mass%.Thermal analysis indicates that BaSO_(4) initially decomposes to produce BaO at 1468 K in the presence of iron ore.BaO combines with Fe_(2)O_(3) forming barium ferrite(Ba_(2)Fe_(6)O_(11)),which exists in the sintered sample with a granular form.BaO also dissolves in calcium ferrite and slag to promote the formation of calcium ferrite and barium glass,respectively.The content of needle-like calcium ferrite gradually increases and then decreases with the increase in BaSO_(4) content.Hematite exists in a plate-like form.The generation of dicalcium ferrite is promoted by increasing the BaSO_(4) addition from 2.0 to 6.0 mass%.

关键词： Sinter barium sulfate Hematite barium ferrite Mineral structure

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