Investigation of Composition and Technological Parameters of Highly Porous Gypsum Products Obtaining

2020 ◽  
Vol 299 ◽  
pp. 130-136 ◽  
Author(s):  
Lilia V. Ilina ◽  
Lubov V. Zavadskaya ◽  
Anastasia I. Ilina
Keyword(s):  
Mechanical Properties ◽  
Calcium Carbonate ◽  
Specific Surface ◽  
Porous Structure ◽  
Glass Fibers ◽  
Technological Parameters ◽  
Aluminum Sulphate ◽  
Product Creation ◽  
Highly Porous ◽  
Ground Calcium Carbonate

A highly porous structure of a gypsum product creation is possible due to the porisation of gypsum mass, using new types of complex gas-forming components. At the same time, it is necessary to determine the technological conditions for the optimal formation of porous gypsum products structure and methods for increasing their strength. The article proposed to use dispersed calcium carbonate and aluminum sulphate, which interaction is the reaction with the release of СО2 for the porisation of the gypsum cast mixture. Micro-reinforcing additives, such as polymeric, basalt and glass fibers were introduced into gypsum composition together with building gypsum and finely ground calcium carbonate to improve the physico-mechanical properties of gas-gypsum. The best results were shown by the gas-gypsum, which included fiberglass. Glass fiber was pre-ground to a specific surface of 190-240 m2 / kg, in order to improve further the physico-mechanical properties of gas-gypsum.

Poly (Divinylbenzene) Particles of Large Specific Surface Area Prepared by Dispersion Polymerization

2010 ◽  
Vol 148-149 ◽  
pp. 1281-1285
Author(s):  
Yu Zeng Zhao ◽  
Yong Sheng Li ◽  
Hong Hua Ge ◽  
Qun Jie Xu
Keyword(s):  
Calcium Carbonate ◽  
Specific Surface ◽  
Porous Structure ◽  
Surface Area ◽  
Specific Surface Area ◽  
Dispersion Polymerization ◽  
Large Specific Surface Area

Porous polydivinylbenzene particles were prepared by dispersion polymerization, using AIBN as initiator, acetonitrile as solvent, calcium carbonate and polypyrrolidone used as dispersion stabilizer and porogen. Ratio of dispersion stabilizer with monomer affects the specific surface area and porous structure. Calcium carbonate and polypyrrolidone used porogen were studied.

Preparation of Composite Ground Calcium Carbonate in Ca(OH)2–H2O–CO2 System and Characterization

2011 ◽  
Vol 287-290 ◽  
pp. 548-552
Author(s):  
Chao Huo ◽  
Jia Yuan Shen ◽  
Qing Hua Xia
Keyword(s):  
Calcium Carbonate ◽  
Rough Surface ◽  
Weight Ratio ◽  
Polymer Materials ◽  
Technological Parameters ◽  
Technical Parameters ◽  
Composite Ground ◽  
Higher Temperature ◽  
Ground Calcium Carbonate ◽  
Key Parameter

Ground calcium carbonate (GCC) is usually of smooth/flat surface and pointed edges angles which have disadvantageous effects on the mechanical properties of composite polymer materials filled with the powder. Nanometer calcium carbonate reactants would deposit, nucleate and grow on surface of ground calcium carbonate with micron grain size by adjusting suitable technical parameters in Ca(OH)2–H2O–CO2 system. Compared with the uncoated powder, composite ground calcium carbonate (CGCC) is of rough surface, blunt edges, larger specific surface area, larger in whiteness. In this paper, we reported the successful preparation of CGCC particles, and found GCC/Ca(OH)2 weight ratio was the key parameter. Some technological parameters were mainly analyzed for the coating process. Furthermore, We also prepared nanosized calcium carbonate coating GCC at higher temperature (40 °C) using additives. Filling tests showed that a rough surface of the CGCC enhanced contact opportunities and improved the interface between polymer and CGCC blended with polypropylene (PP).

scholarly journals Improving Paper Mechanical Properties Using Silica-modified Ground Calcium Carbonate as Filler

BioResources ◽  
2015 ◽  
Vol 10 (4) ◽  
Author(s):  
Ana F. Lourenço ◽  
José A. F. Gamelas ◽  
João Sequeira ◽  
Paulo J. Ferreira ◽  
José L. Velho
Keyword(s):  
Mechanical Properties ◽  
Calcium Carbonate ◽  
Ground Calcium Carbonate

Synthesizing MgO with a high specific surface for carbon dioxide adsorption

RSC Advances ◽  
2015 ◽  
Vol 5 (39) ◽  
pp. 30929-30935 ◽  
Author(s):  
Yu-Dong Ding ◽  
Gan Song ◽  
Xun Zhu ◽  
Rong Chen ◽  
Qiang Liao
Keyword(s):  
Carbon Dioxide ◽  
Specific Surface ◽  
Porous Structure ◽  
Adsorption Capacity ◽  
Carbon Dioxide Adsorption ◽  
Economic Methods ◽  
Highly Porous

Porous MgO were synthesized by simple and economic methods. The synthesized MgO exhibited highly porous structure and high CO2 adsorption capacity. This work provides a new way to synthesized MgO with highly porous structure for CO2 adsorption.

scholarly journals INVESTIGATION OF SOME MECHANICAL PROPERTIES FOR NATURAL (EGGSHELL) AND INDUSTRIAL (CALCIUM CARBONATE) MATERIAL / REINFORCED WITH GLASS FIBER WITH POLYMER COMPOSITE

2020 ◽  
Vol 24 (06) ◽  
pp. 137-141
Author(s):  
Marwah Subhi Attallah ◽  
Keyword(s):  
Mechanical Properties ◽  
Calcium Carbonate ◽  
Glass Fiber ◽  
Glass Fibers ◽  
Matrix Material ◽  
Weight Fraction ◽  
Mean Values ◽  
Particle Size Analyzer ◽  
Carbonate Material ◽  
The Mean

The purpose of this paper is to discuss the influence of adding eggshell and calcium carbonate powder reinforced with glass fibers and epoxy resin. Hand Lay-upimethod was utilized for the preparation of samples from epoxyiresin as a matrix material with (6%weight fraction chopped glass fiber) and (2%,4%, 6% & 8% weight fraction eggshell, CaCO3 powder) as filler material . The tensile and impact properties are tested for the specimens containing calcium carbonate and eggshell powder reinfoced with glass fiber and epoxy resins, also the result analyzed by (SPSS) to determine the specimens have best mechanical properties. The mean particle size analyzer of the eggshell powder and calcium carbonate powder were (12.6µm, 0.4-1µm) respectively. The results showed that the mean values of tensile test, modulus of elasticity, impact strength and fracture toughness (247.50,222.00MPa) (8.450,7.500 GPa) (8.150, 7.500K.J/m2) (9.1675 , 7.8345 MPa.m1/2) respectively increased with the addition (6% glass fiber+8%CaCO2, eggshell), while the mean values of the elongation percentage at break (%) decrease with the addition (6% glass fiber+8%CaCO2). The SPSS statistical shown the values was significantly increased whenever the value (Sig < 0.05).

Perspective Biomass Carrier for Anaerobic Processing Systems of Organic Waste AIC

2020 ◽  
Vol 67 (1) ◽  
pp. 148-155
Author(s):  
Anatoliy V. Fedotov ◽  
Viktor S. Grigoriev ◽  
Dmitriy A. Kovalev ◽  
Andrey A. Kovalev
Keyword(s):  
Wastewater Treatment ◽  
Anaerobic Digestion ◽  
Specific Surface ◽  
Organic Waste ◽  
Porous Ceramic ◽  
Experimental Studies ◽  
Ceramic Materials ◽  
Porous Ceramics ◽  
Developed Surface ◽  
Highly Porous

To speed up the wastewater treatment under aerobic conditions and to optimize the processes of anaerobic wastewater treatment in digesters, immobilization technologies of microorganisms and enzymes on solid carriers are used. Ceramic carriers based on aluminosilicates and alumina are one of the promising inorganic biomass carriers. (Research purpose) To study the structure of porous ceramic biomass carriers for anaerobic processing of organic waste and evaluate the prospects for their use. (Materials and methods) The substrate for anaerobic digestion was a mixture of sediments of the primary and secondary sewage sumps of the Lyubertsy treatment facilities. K-65 cattle feed was used to ensure the constancy of the composition of organic substances in substrates as a cosubstrate. The authors used the method of low-temperature nitrogen adsorption of Bruner-Emmett-Teller to study the pore structure and specific surface of solid carriers on a specific surface analyzer Quntachrome Autosorb-1. (Results and discussion) The main characteristics (specific surface, volume of micro- and mesopores, predominant pore radius, water absorption and others) of chamotte foam lightweight and highly porous corundum ceramics were determined. It was revealed that ceramic materials with a developed surface and electrically conductive material provided an increase in biogas yield by 3.8-3.9 percent with an increase in methane content by an average of 5 percent. (Conclusions) The results of anaerobic digestion showed a positive effect of both a conductive carrier and highly porous ceramic materials on the process of anaerobic bioconversion of organic waste into biogas. It is advisable to expand experimental studies on the use of a conductive carrier with a developed surface based on highly porous ceramics.

scholarly journals Nanoporous Quasi-High-Entropy Alloy Microspheres

Metals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 345 ◽  
Author(s):  
Lianzan Yang ◽  
Yongyan Li ◽  
Zhifeng Wang ◽  
Weimin Zhao ◽  
Chunling Qin
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
High Specific Surface Area ◽  
High Entropy Alloy ◽  
Face Centered Cubic ◽  
High Entropy ◽  
Hierarchical Porous

High-entropy alloys (HEAs) present excellent mechanical properties. However, the exploitation of chemical properties of HEAs is far less than that of mechanical properties, which is mainly limited by the low specific surface area of HEAs synthesized by traditional methods. Thus, it is vital to develop new routes to fabricate HEAs with novel three-dimensional structures and a high specific surface area. Herein, we develop a facile approach to fabricate nanoporous noble metal quasi-HEA microspheres by melt-spinning and dealloying. The as-obtained nanoporous Cu30Au23Pt22Pd25 quasi-HEA microspheres present a hierarchical porous structure with a high specific surface area of 69.5 m2/g and a multiphase approximatively componential solid solution characteristic with a broad single-group face-centered cubic XRD pattern, which is different from the traditional single-phase or two-phase solid solution HEAs. To differentiate, these are named quasi-HEAs. The synthetic strategy proposed in this paper opens the door for the synthesis of porous quasi-HEAs related materials, and is expected to promote further applications of quasi-HEAs in various chemical fields.

scholarly journals Influence of Gating System Parameters of Die-Cast Molds on Properties of Al-Si Castings

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3755
Author(s):  
Štefan Gašpár ◽  
Tomáš Coranič ◽  
Ján Majerník ◽  
Jozef Husár ◽  
Lucia Knapčíková ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Computer Modelling ◽  
Permanent Deformation ◽  
Surface Hardness ◽  
Technological Parameters ◽  
Inlet System ◽  
Die Cast ◽  
Key Factor ◽  
Fine Grained Structure ◽  
Design Solutions

The resulting quality of castings indicates the correlation of the design of the mold inlet system and the setting of technological parameters of casting. In this study, the influence of design solutions of the inlet system in a pressure mold on the properties of Al-Si castings was analyzed by computer modelling and subsequently verified experimentally. In the process of computer simulation, the design solutions of the inlet system, the mode of filling the mold depending on the formation of the casting and the homogeneity of the casting represented by the formation of shrinkages were assessed. In the experimental part, homogeneity was monitored by X-ray analysis by evaluating the integrity of the casting and the presence of pores. Mechanical properties such as permanent deformation and surface hardness of castings were determined experimentally, depending on the height of the inlet notch. The height of the inlet notch has been shown to be a key factor, significantly influencing the properties of the die-cast parts and influencing the speed and filling mode of the mold cavity. At the same time, a significant correlation between porosity and mechanical properties of castings is demonstrated. With the increasing share of porosity, the values of permanent deformation of castings increased. It is shown that the surface hardness of castings does not depend on the integrity of the castings but on the degree of subcooling of the melt in contact with the mold and the formation of a fine-grained structure in the peripheral zones of the casting.

scholarly journals Effects of Microwave Treatment in Immersed Conditions on the Mechanical Properties of Jute Yarn

Fibers ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 40
Author(s):  
Felicia Syrén ◽  
Joel Peterson ◽  
Nawar Kadi
Keyword(s):  
Mechanical Properties ◽  
Tensile Testing ◽  
Glass Fibers ◽  
Microwave Treatment ◽  
Environmental Benefits ◽  
Treatment Result ◽  
Bast Fiber ◽  
Fiber Properties ◽  
Yarn Thickness ◽  
Jute Yarn

The versatile bast fiber jute has environmental benefits compared to glass fibers. However, for jute to be used in a composite, the fiber properties need to be altered. This study aims to improve the mechanical properties of jute yarn to make it more suitable for technical applications as a composite. To alter its mechanical properties, jute yarn was immersed in water during microwave treatment. The time and power of the microwave settings differed between runs. Two states of the yarn were tested: fastened and un-fastened. Tensile testing was used at the yarn and fiber level, followed by Fourier-transform infrared spectroscopy (FTIR) and microscopy. The treatment result demonstrated the ability to increase the elongation of the jute yarn by 70%. The tenacity was also increased by 34% in the fastened state and 20% in the un-fastened state. FTIR showed that no change in the molecular structure occurred. The treatments resulted in a change of yarn thickness depending on the state of the yarn. The results indicate that microwave treatment can be used to make jute more suitable for technical applications depending on the microwave treatment parameters.

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