Effect of Sodium Silicate on Properties of Magnesia Inorganic Lightweight Materials

Magnesia inorganic lightweight material was prepared by using magnesium cementitious materials as raw materials, sodium silicate solution as modifier, hydrogen peroxide solution as foaming agent, manganese dioxide as activator, calcium stearate as stabilizer and polyacrylamide as thickener in this paper. The effects of sodium silicate addition on the apparent density, mechanical strength, pore structure, crystalline phase and water resistance of magnesia inorganic lightweight material were discussed. The results show that when the content of sodium silicate is 7.5‰, the pore structure presents better morphology and the crystallization contains more 5·1·8 phases (strength phase). At this moment, the compressive strength and bending strength of the composite reached 10.35 MPa and 2.22 MPa, respectively. When the addition of sodium silicate exceeded 7.5‰, SEM and EDS presented that a large amount of sodium silicate and perforation appeared in the pores, meanwhile large number of perforations occurred between pores. XRD showed that the 5·1·8 phases and 3·1·8 phases in the materials changed into Mg (OH)2 crystals. These results in a significant decrease in material properties. Keywords: Magnesium cementitious material; Sodium silicate; Inorganic light materials; Pore structure

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INFLUENCE OF NON-PLASTIC COARSE-DISPERSED COMPONENTS ON THE PROPERTIES OF CERAMIC MATERIAL

Bulletin of Belgorod State Technological University named after V G Shukhov ◽

10.34031/2071-7318-2020-5-10-8-16 ◽

2020 ◽

Vol 5 (10) ◽

pp. 8-16

Author(s):

V. Men'shikova

Keyword(s):

Grain Size ◽

Ceramic Material ◽

Sodium Silicate ◽

Glass Phase ◽

Bending Strength ◽

Raw Materials ◽

Sodium Silicate Solution ◽

Silicate Solution ◽

Coarse Grained ◽

Fine Grained Structure

In modern conditions, clay raw materials of fine-grained structure are used for the production of building ceramics. The task of using coarse non-traditional non-plastic components in the compositions of ceramic masses and the choice of rational sizes of their grains is relevant. The exclusion of pre-grinding determines the reduction of energy costs and, as a result, the cost of finished products. The paper offers an optiom of using diopside concentrate of various grain sizes in compositions with minor additions of clay and sodium silicate solution. The problems of stress development at the interface of grain and ligament contact, which in case of a negative outcome do not make it possible to obtain a strong structure of a ceramic shard, are solved. The presence of an insignificant voltage formed as a result of the relationship between the diopside and the forming glass phase is revealed, this does not prevent the consideration of the probability of obtaining a ceramic material. The study of the behavior of ceramic samples containing diopside of different granulometric composition when adding a solution of sodium-silicate glass after molding and firing shows the effectiveness of using diopside concentrate in 100-150 microns. Contacts of this size of diopside are wrapped in liquid glass during molding. A glass phase is formed when fired. In this case, the diopside is partially melted, but it is preserved and exists as an independent unit. A smaller grain size during sintering requires more glass phase, which leads to structural stresses, and with a larger size, not enough glass phase is formed and the strength of the material is significantly reduced. When studying the influence of grain size on the properties of the sample, the results of water absorption indicators of 7 %, mechanical compressive strength – 36 MPa, bending strength-17 MPa are obtained. It is found that the dispersion of diopside in 100–150 microns allows to develop a technology for the use of coarse-grained raw materials in the ceramic mass

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Effect of Alkaline Activators to Engineering Properties of Geopolymer-Based Materials Synthesized from Red Mud

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.777.508 ◽

2018 ◽

Vol 777 ◽

pp. 508-512 ◽

Cited By ~ 5

Author(s):

Van Quang Le ◽

Minch Quang Do ◽

Minh Duc Hoang ◽

Vo Thi Ha Quyen Pham ◽

Thu Ha Bui ◽

...

Keyword(s):

Sodium Hydroxide ◽

Sodium Silicate ◽

Red Mud ◽

Raw Materials ◽

Sodium Hydroxide Solution ◽

Sodium Silicate Solution ◽

Silicate Solution ◽

High Heat ◽

Engineering Properties ◽

Alumina Production

Geopolymer is an inorganic polymer material formed from alumino-silicate structures. Geopolymer has many outstanding functions in comparison with ordinary materials such as high mechanical strength, high heat and chemical resistance, and lightweight property. The engineering properties of geopolymer-based materials depend on raw materials and synthesized conditions. In which, the aluminosilicate materials having high activity and consisting of many alkaline activators have the possibility of increasing pH in geopolymer paste. In the solution of paste, aluminosilicate compounds are solubilized and then react with alkali-activated ions to form geopolymeric networks. The geopolymer can be synthesized in many different conditions depending on factors of temperature, pressure, and curing conditions. In this study, red mud (RM) was used as the main alumino resource for geopolymerization process. RM is a solid waste residue being left from the mining process of bauxite ores with caustic soda for alumina production. Its disposal remains a global issue in terms of environmental concerns. Formation of RM-based geopolymer was affected by many factors, in which, the alkaline activators are the most important factor. This research was conducted with sodium hydroxide and sodium silicate solutions to elucidate the effect of alkaline activator ratio to the engineering properties of RM-based geopolymers. The results showed that the RM-based geopolymer used sodium silicate solution has more outstanding properties than RM-based geopolymer using sodium hydroxide solution.

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CO2 Capture using Sodium Silicate Solution in a Packed Bed Column

E3S Web of Conferences ◽

10.1051/e3sconf/202132801015 ◽

2021 ◽

Vol 328 ◽

pp. 01015

Author(s):

Srie Muljani ◽

Heru Setyawan ◽

Fryski Indra Irianto ◽

Sylvanus Pridia Fransisco

Keyword(s):

Sodium Silicate ◽

Amorphous Silica ◽

Raw Materials ◽

Economic Value ◽

Packed Column ◽

Sodium Silicate Solution ◽

Packed Bed ◽

Silicate Solution ◽

Product Analysis ◽

Sem Image

The use of solid adsorbents such as amine-modified silica aerogels to capture CO2 has been commonly used but poses several obstacles, including expensive raw materials, production complexity, and considerations for adsorbent regeneration. This research develops sodium silicate solution as a carbon scrubber in a packed column. Besides being able to capture CO2, the amorphous silica which has economic value can also be produced. The packing size and CO2 flow rate were studied to prevent the deposition of silica inside of the packed column. The precipitated product analysis using XRF, XRD, FTIR, and SEM Image observed that CO2 was well absorbed by sodium silicate solution. The amorphous silica precipitated concentration reaches 98.6%.

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Investigation on alkali activated fly ash and slag concrete using neutral grade water glass as activator

E3S Web of Conferences ◽

10.1051/e3sconf/202130901195 ◽

2021 ◽

Vol 309 ◽

pp. 01195

Author(s):

G.V.V. Satyanarayana ◽

Kaparaboina Greeshma

Keyword(s):

Fly Ash ◽

Construction Industry ◽

Raw Materials ◽

Sodium Silicate Solution ◽

Silicate Solution ◽

Cementitious Materials ◽

Polymer Concrete ◽

Portland Cement Concrete ◽

Lime Stone ◽

Alkali Activated

The utilization of cement in concrete was an ancient method as well the utilization of cementitious materials in concrete not only improves mechanical properties but also improves workability and durability etc., Today urbanization expands in many folds, so that the usage of cement became more due to this the production of cement increases. The production of cement on one hand affects the environment in form of Carbon dioxide gases on other hand depreciation of raw materials like lime stone and sand etc. Globally many construction industry and researches focussed in reduction of cement content in concrete by production of new alternatives like Geo polymer concrete etc. In this investigation Alkali-Activated Fly Ash slag concrete (AAFSC) is introduced as an alternative for ordinary Portland cement concrete (OPCC). Researchers developed AAFSC with NaOH and Na2SiO3 as activators. In this study AAFSC produced is with neutral grade sodium silicate solution with silica modulus 2.9 (Ms).For production of AAFSC the quantity of binder content is 500kg/m3 by varying binders proportions like Fly Ash and GGBS along with solution/binder ratios varying from 0.6 to 0.7. During this experimental investigation the workability and compressive strength of AAFSC is tested.

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Effect of Different Concentrations of Sodium Silicate Impregnated on the Performance of Carbon/Copper Composites

Materials Science Forum ◽

10.4028/www.scientific.net/msf.749.308 ◽

2013 ◽

Vol 749 ◽

pp. 308-315

Author(s):

Hui Jun Yang ◽

Heng Peng Wang ◽

Bin Tang ◽

Jun Wei Qiao

Keyword(s):

Abrasive Wear ◽

Sodium Silicate ◽

Bending Strength ◽

Sodium Silicate Solution ◽

Silicate Solution ◽

Mechanical And Tribological Properties ◽

Lubricating Film ◽

Pitch Coke ◽

Electrolytic Copper Powder ◽

Coke Powder

Sodium silicate solution-impregnated carbon/copper composites were prepared from electrolytic copper powder, graphite particulate and pitch coke powder through compression molding, carbonization and impregnation. The effect of different concentrations of sodium silicate solution on their mechanical and tribological properties was studied. The results showed that the density of the composites increased monotonically with increasing the concentration of the sodium silicate solution. As did the bending strength and compressive strength, and they reached maxima of 47.78 MPa and 170.06 MPa at 30 wt. % of sodium silicate, respectively. The friction coefficient and wear rate of composite decreased monotonically with increasing the concentration of sodium silicate due to the formation of a lubricating film. The wear mechanism of the impregnated composites was abrasive wear accompanied by slight adhesive wear. The netlike silicon dioxide skeleton reduced the probability of abrasive wear, forming an integrated lubricating film.

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

Materials ◽

10.3390/ma14112811 ◽

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.

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Silica extraction from bauxite reaction residue and synthesis water glass

Green Processing and Synthesis ◽

10.1515/gps-2021-0028 ◽

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.

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1010-1012.1015 ◽

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.

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