scholarly journals Granulated Expanded Glass Manufacturing Method Using Electromagnetic Waves

2021 ◽  
Vol 2 (5) ◽  
pp. 14-27
Author(s):  
Lucian Paunescu ◽  
Sorin Mircea Axinte ◽  
Felicia Cosmulescu ◽  
Marius Florin Dragoescu
Keyword(s):  
Electromagnetic Waves ◽  
Spherical Shape ◽  
Sodium Silicate Solution ◽  
Silicate Solution ◽  
Raw Material ◽  
Light Weight ◽  
Water Addition ◽  
Glass Waste ◽  
Manufacturing Method ◽  
Rotary Kilns

The paper presents experimental results obtained in the process of experimental manufacture in a microwave oven of lightweight granulated glass aggregates. The process was conducted to obtain the highest dimensional class (between 18-23 mm), the almost spherical shape of the aggregates being facilitated by cold processing of raw spherical pellets (between 11-15 mm) containing the powder mixture formed by glass waste, borax. calcium carbonate, aqueous sodium silicate solution and water addition and then rotation of the high electromagnetic wave susceptible ceramic crucible containing raw pellets during the heat treatment at temperatures between 822-835 ºC. In terms of quality, the expanded glass aggregate granules are almost similar to those manufactured in conventional rotary kilns heated by burning fuel, having the following characteristics: bulk density of 0.17 g/cm3, compressive strength of 2.2 MPa, thermal conductivity of 0.047 W/m·K, water absorption of 1 vol. % and pore size between 0.3-0.6 mm. The experimental product has not yet been tested as a raw material in the manufacture of some light weight concretes, but the use of similar granulated glass aggregates manufactured in the world confirms the ability of this aggregate type to produce light weight and energy efficient concretes for building construction.  

scholarly journals Granulated Expanded Glass Manufacturing Method Using Electromagnetic Waves

2021 ◽  
Vol 2 (4) ◽  
pp. 40-52
Author(s):  
Lucian Paunescu ◽  
Sorin Mircea Axinte ◽  
Felicia Cosmulescu ◽  
Marius Florin Dragoescu
Keyword(s):  
Electromagnetic Waves ◽  
Spherical Shape ◽  
Sodium Silicate Solution ◽  
Silicate Solution ◽  
Raw Material ◽  
Light Weight ◽  
Water Addition ◽  
Glass Waste ◽  
Manufacturing Method ◽  
Rotary Kilns

The paper presents experimental results obtained in the process of experimental manufacture in a microwave oven of lightweight granulated glass aggregates. The process was conducted to obtain the highest dimensional class (between 18-23 mm), the almost spherical shape of the aggregates being facilitated by cold processing of raw spherical pellets (between 11-15 mm) containing the powder mixture formed by glass waste, borax. calcium carbonate, aqueous sodium silicate solution and water addition and then rotation of the high electromagnetic wave susceptible ceramic crucible containing raw pellets during the heat treatment at temperatures between 822-835 ºC. In terms of quality, the expanded glass aggregate granules are almost similar to those manufactured in conventional rotary kilns heated by burning fuel, having the following characteristics: bulk density of 0.17 g/cm3, compressive strength of 2.2 MPa, thermal conductivity of 0.047 W/m·K, water absorption of 1 vol. % and pore size between 0.3-0.6 mm. The experimental product has not yet been tested as a raw material in the manufacture of some light weight concretes, but the use of similar granulated glass aggregates manufactured in the world confirms the ability of this aggregate type to produce light weight and energy efficient concretes for building construction.

A Study on a Green Route to Preparation of Silica Powders with Rice Husk Ash

2014 ◽  
Vol 1010-1012 ◽  
pp. 1015-1019
Author(s):  
Ze Xin Yang ◽  
Lin Dong ◽  
Meng Wang ◽  
Huan Li
Keyword(s):  
Sodium Bicarbonate ◽  
Sodium Silicate ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Sodium Hydroxide Solution ◽  
Sodium Silicate Solution ◽  
Silicate Solution ◽  
Raw Material ◽  
Transmission Electron ◽  
Thermal Analyzer

The main purpose of this article is to develop an environmentally friendly and economically effective process to produce silica from rice husk ash. Sodium silicate solution was prepared by the reaction of rice husk ash and sodium hydroxide solution, and then the sodium silicate solution was used as the raw material for the preparation of silica with sodium bicarbonate. During the reaction, the by-product can be passed into CO2 to prepare sodium bicarbonate what can be reutilized. Experimental route achieved resource recycling and environment-friendly, low energy consumption, zero emissions and so on. Meanwhile the microstructures of the silica powders were characterized by Transmission electron microscope (TEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) and Thermo gravimetric/Differential thermal analyzer (TG-DTA).The purity of silicon was up to 99.43% and the particle size was 200-300nm.

Effect of Alkali on the Geopolymer Strength

2010 ◽  
Vol 168-170 ◽  
pp. 1827-1832 ◽  
Author(s):  
Ting Sheng Qiu ◽  
Jing Zhong Kuang ◽  
Fang Shi
Keyword(s):  
Liquid Phase ◽  
Sodium Silicate ◽  
Sodium Silicate Solution ◽  
Silicate Solution ◽  
Alkali Solution ◽  
Raw Material ◽  
Alkali Activator ◽  
Content Ratio ◽  
And Tungsten ◽  
Trigger Action

In this study, geopolymer was synthesized with metakaolin and tungsten-tailing as the main raw material and alkali activator composed of sodium silicate solution and alkali solution. By the contrast of the experiments with five kinds of alkali activators, the result was obtained. When the concentration of the NaOH or KOH was 10mol/L,the content of NaOH or KOH in the liquid phase was 35%,while the concentration of the Ca(OH)2was 3mol/L, the content in the liquid phase was 35%,the property of geopolymer was the best. For the combined alkali, when the content ratio of Ca(OH)2to KOH or Ca(OH)2to NaOH of 2:3,there was a balance between the activator of alkali and the resistance of Ca2+.The trigger action of the alkali activator on the activity of slag was accelerated.

Research on the Intermetallic Compounds Formation in a Ni-Ti Alloy Obtained through Powder Metallurgy Specific Methods

2011 ◽  
Vol 672 ◽  
pp. 125-128 ◽  
Author(s):  
Viorel Cândea ◽  
George Arghir ◽  
Catalin Popa ◽  
Ionuţ Gligor ◽  
Angela Popa ◽  
...  
Keyword(s):  
Niti Alloy ◽  
Spherical Shape ◽  
Raw Material ◽  
Light Weight ◽  
Ti Alloy ◽  
Medical Field ◽  
Hollow Particles ◽  
Good Corrosion Resistance ◽  
Surgical Implants ◽  
Specific Particle

NiTi alloys, due to the special properties they posses, good corrosion resistance, biocompatibility, and shape memory, are used successfully in the medical field. The paper presents research concerning the elaboration of the NiTi alloy in the form of spherical shape powder with hollow particles. This type of powder would be the raw material for fabricating light weight products like prosthesis or surgical implants. The aim of the research was to elaborate this type of powder and determine the alloy’s phases in correlation with the need of obtaining a specific particle shape. Along with these aspects it was attempted to form different testing samples through sintering operations.

Facile Synthesis Silica Nanoparticles from Indonesia Silica Sand and their Physico-Chemical Properties

2020 ◽  
Vol 862 ◽  
pp. 35-39
Author(s):  
Agus Ismail ◽  
Ariffinisa Lintang Widyaningtyas ◽  
Bambang Heru Susanto ◽  
Mohammad Nasikin
Keyword(s):  
Silica Nanoparticles ◽  
Sodium Silicate ◽  
Sol Gel ◽  
Chemical Properties ◽  
Spherical Shape ◽  
Sodium Silicate Solution ◽  
Silicate Solution ◽  
Silica Sand ◽  
Easy Method ◽  
Simple Method

Silica nanoparticles are a very promising functional material when purified from silica sand for wide application. In addition, a low cost and easy method to obtain the material will be increasing the value of silica sand. To synthesize of nanoparticles using an easily scalable, cheap and simple method, we suggest a sodium silicate solution as a precursor that silica sand was diluted on the NaOH. After that, the sodium silicate solution under various alcohols (methanol and ethanol) in the acid medium was conducted by sol gel method to obtain silica nanoparticles. The synthesized of silica nanoparticles was observed to the non-agglomerate, homogeneous and spherical shape with an average size about 200 nm. We also noted the existence of NaNO3 by side product of reaction on the system, which may be the amorphous silica unidentified on the XRD results.

Manufacturing of Light Weight Aggregates from the Local Waste Materials for Application in the Building Concrete

2017 ◽  
Vol 904 ◽  
pp. 174-178 ◽  
Author(s):  
Tomasz Pawlik ◽  
Daniel Michalik ◽  
Malgorzata Sopicka-Lizer ◽  
Marcin Godzierz
Keyword(s):  
Mechanical Properties ◽  
Coal Mine ◽  
Waste Utilization ◽  
Waste Materials ◽  
Mine Wastes ◽  
Light Weight ◽  
Local Power ◽  
Water Addition ◽  
Glass Waste ◽  
Fine Grained

The aim of those research was to find out the technique of the car windshield glass waste utilization. The research was performed in cooperation with the Polish small company, active in the waste utilization. Manufacturing of the light weight aggregates (LWAs) for application in the building concrete has been chosen as an appropriate solution. The local coal mine slates, the fine-grained coal mine wastes and fly ash from the local power station were tried for making the suitable mixture for granulation and sintering. All waste materials were characterized for their granulation, chemical composition and thermal behavior (DTA, TG/DTG, linear changes). Several mixtures with various composition were prepared, milled, homogenized and pelletized with water addition and finally sintered at 950°C. Thermally treated granules were tested for their density, porosity and mechanical properties. Some specimens were observed in scanning microscope. It has been shown that by variation of the composition of the waste materials it is possible to produce aggregates with a large variety of mechanical properties and porosities.

scholarly journals Printability and Setting Time of CSA Cement with Na2SiO3 and Gypsum for Binder Jetting 3D Printing

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2811
Author(s):  
Okpin Na ◽  
Kangmin Kim ◽  
Hyunjoo Lee ◽  
Hyunseung Lee
Keyword(s):  
3D Printing ◽  
Sodium Silicate ◽  
Setting Time ◽  
Sodium Silicate Solution ◽  
Preliminary Test ◽  
Silicate Solution ◽  
Calcium Sulfoaluminate Cement ◽  
Calcium Sulfoaluminate ◽  
Parametric Studies ◽  
Binder Jetting

The purpose of this study is to optimize the composition of CSA (calcium sulfoaluminate) cement with sodium silicate (Na2SiO3) and gypsum for binder jetting 3D printing. The preliminary test was carried out with an applicator to decide the proper thickness of one layer before using the 3D printer. A liquid binder was then selected to maintain the shape of the particles. Based on the results, the optimal mixture of dry materials and a liquid activator was derived through various parametric studies. For dry materials, the optimum composition of CSA cement, gypsum, and sand was suggested, and the liquid activator made with sodium silicate solution and VMA (viscosity modified agent) were selected. The setting time with gypsum and sodium silicate was controlled within 30 s. In case of the delayed setting time and the rapid setting mixture, the jetting line was printed thicker or thinner and the accuracy of the printout was degraded. In order to adjust the viscosity of the liquid activator, 10% of the VMA was used in 35% of sodium silicate solution and the viscosity of 200–400 cP was suitable to be sprayed from the nozzle. With this optimal mixture, a prototype of atypical decorative wall was printed, and the compressive strength was measured at about 7 MPa.

scholarly journals Silica extraction from bauxite reaction residue and synthesis water glass

2021 ◽  
Vol 10 (1) ◽  
pp. 268-283
Author(s):  
Yunlong Zhao ◽  
Yajie Zheng ◽  
Hanbing He ◽  
Zhaoming Sun ◽  
An Li
Keyword(s):  
Sodium Silicate ◽  
Water Glass ◽  
Sodium Silicate Solution ◽  
Silicate Solution ◽  
Hydrated Calcium Silicate ◽  
Precipitated Silica ◽  
Alumina Gel ◽  
Silica Alumina ◽  
Element Removal ◽  
Hydrated Calcium

Abstract Bauxite reaction residue (BRR) produced from the poly-aluminum chloride (PAC) coagulant industry is a solid acidic waste that is harmful to environment. A low temperature synthesis route to convert the waste into water glass was reported. Silica dissolution process was systematically studied, including the thermodynamic analysis and the influence of calcium and aluminum on the leaching of amorphous silica. Simulation studies have shown that calcium and aluminum combine with silicon to form hydrated calcium silicate, silica–alumina gel, and zeolite, respectively, thereby hindering the leaching of silica. Maximizing the removal of calcium, aluminum, and chlorine can effectively improve the leaching of silicon in the subsequent process, and corresponding element removal rates are 42.81%, 44.15%, and 96.94%, respectively. The removed material is not randomly discarded and is reused to prepare PAC. The silica extraction rate reached 81.45% under optimal conditions (NaOH; 3 mol L−1, L S−1; 5/1, 75°C, 2 h), and sodium silicate modulus (nSiO2:nNa2O) is 1.11. The results indicated that a large amount of silica was existed in amorphous form. Precipitated silica was obtained by acidifying sodium silicate solution at optimal pH 7.0. Moreover, sodium silicate (1.11) further synthesizes sodium silicate (modulus 3.27) by adding precipitated silica at 75°C.

Incorporation of Wastes from Marble to Produce Brick Materials

2012 ◽  
Vol 174-177 ◽  
pp. 135-139
Author(s):  
Qing Bo Tian ◽  
Li Zong Chen ◽  
Li Na Xu ◽  
Yong Guang Fang
Keyword(s):  
Compressive Strength ◽  
Glass Fiber ◽  
Room Temperature ◽  
Wood Flour ◽  
Raw Material ◽  
Water Addition ◽  
Water Curing

A brick material was prepared with marble wastes as main raw material by pressure forming and water-curing at room temperature. With the increases of the amounts of water additions, the compressive strength increased gradually and obtained a highest value of 34.8MPa in the sample of the ratio of cement: wastes=20:100 at 17.0% water addition, above which the strength had an adverse change and decreased. The addition of glass fiber had small effects on the strength, water absorbing rate and density comparing with that of wood flour. The strengths of sample had changed obviously with the increment of the forming pressures. However, the strength would fall because of the lamination caused by the recovering effects of the wood flour in the sample with replacement of the wood flour to marble wastes, as the forming pressures were higher than 5.0 MPa.

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