Foam Glass for Soilless Cultivation Matrix Prepared by Using Boron Mud

2013 ◽  
Vol 455 ◽  
pp. 106-111
Author(s):  
Yan Yan Jiang ◽  
Ya Nan Li ◽  
Ji Wen Zhang ◽  
Qiao Yu ◽  
Zhi Qiang Hu ◽  
...  
Keyword(s):  
Immersion Time ◽  
Absorption Rate ◽  
Ph Value ◽  
Foam Glass ◽  
Foaming Agents ◽  
Preparation Conditions ◽  
Soilless Cultivation ◽  
Foaming Temperature ◽  
Boron Mud ◽  
Foaming Time

Foam glass was prepared by boron mud, broken glass, foaming agents and fluxes. The appropriate foaming temperature and foaming time were got by sintering parameter optimization. The effects of preparation conditions on propertis of the foam glass for soilless cultivation matrix were investigated. The results show that under the optimum preparation conditions (the foaming temperature is 800 °C and foaming time is 40 min), the formula for boron mud/broken glass: Borax: Sodium nitrate: Calcium carbonate is 35/50: 5:7:3, the bulk density is 247 kg/m3, the open porosity is 70%, the water absorption rate is 202.3%, the pH value of soak solution keeps at about 6.5 with the increase of immersion time. All of these will meet the application requirement of soilless cultivation.

Research on Heat Treatment Process of Foam Glass Prepared by Titania-Bearing Blast Furnace Slag

2009 ◽  
Vol 79-82 ◽  
pp. 1587-1590 ◽  
Author(s):  
He Yang ◽  
Ming Long Ma ◽  
Ming Lei Gao ◽  
Xiang Xin Xue ◽  
You Quan Tang
Keyword(s):  
Heat Treatment ◽  
Blast Furnace ◽  
Heating Rate ◽  
Blast Furnace Slag ◽  
Treatment Process ◽  
Foam Glass ◽  
Heat Treatment Process ◽  
Foaming Temperature ◽  
Furnace Slag ◽  
Foaming Time

Foam glass insulation materials were made by using titania-bearing blast furnace slag. Heat treatment process including foaming temperature, foaming time and heating rate were studied and their parameters were determined. First of all, heat treatment process parameter was determined by single factor experiment. Second, optimum process parameters of heat treatment process were obtained by the optimization of orthogonalization procedure. The results showed that foaming temperature has a remarkable effect on sample pore structure ；Foaming time has a less effect on pore distribution but its effect on the diameter of the pore is obvious; Heating rate has a less effect on the diameter of the pore. The magtitude of impact of heat treatment on glass properties arrange in an order of foaming temperature, foaming time and heating rate. The Optimal parameters of heat treatment are that heating rate ,foaming temperature and foaming time are 12°C/min，900°C, 15min respectively ; After preheating, sintering, foaming and foam stability and annealing heat treatment process, an amorphous foam glass with uniform pore size was obtained. Its thermal conductivity coefficient, the bulk density, compressive strength and average diameter are 0.131w / m ∙ k, 445.8 kg/m3, 2.8MPa, 4.78mm respectively. This kind of material can be widely used in building, chemical and shipbuilding industry as thermal insulation, sound absorption, corrosion-resistant and floating materials. Titania-bearing blast furnace slag is solid waste generated from vanadium-titanium magnetite by the blast furnace smelting, which is accumulated without being utilized. At present, Titania-bearing blast furnace slag is mainly used for cement concrete admixture, preparation of photocatalytic materials, extraction of titanium dioxide etc [1-2].Foam glass has been playing a more important role in low-temperature thermal insulation and moisture-proof anticorrosive projects field, and getting more economic benefits in energy saving and technology field. At present, the stuff for preparing foam glass is solid waste including waste glass, fly ash, slag, or natural minerals such as ash, mica, perlite etc. Foaming agent is usually selected from Carbon and carbonate [3-6]. In this paper, foam glass insulation materials were made by using titania-bearing blast furnace slag-based stuff. The effect of heat treatment process on foam glass performance was studied in a bid to find a new way to utilize titania-bearing blast furnace.

Response Surface Optimization of Adsorption Conditions of Neutral Red Wastewater by Brewer's Grains

2014 ◽  
Vol 955-959 ◽  
pp. 2859-2863
Author(s):  
Xin Long Jiang ◽  
Yi Hua Jiang ◽  
Cheng Gang Cai
Keyword(s):  
Absorption Rate ◽  
Ph Value ◽  
Neutral Red ◽  
Optimal Parameters ◽  
Adsorption Time ◽  
Response Surface Optimization ◽  
Adsorption Temperature ◽  
Response Optimization ◽  
Maximal Absorption ◽  
Adsorbent Particle

Abstract: Surface response optimization of adsorption conditions of neutral red wastewater by brewer's grains with the factors of pH value, initial concentration,adsorption temperature, adsorption time, adsorbent quantity and the response of adsorption rate were studied. The optimal parameters for adsorption conditions were of adsorbent concentration of 191.24 mg·L-1, adsorbent particle size of 60~80 mesh,pH 4.65, adsorbent amount of 2.56 g·L-1, adsorption time and temperature of 1.92 h and 30°C, respectively. The maximal absorption rate got 99.16%.The brewer's grains is a promising, cheap, efficient, new biological materials of adsorption for neutral red in wastewater.

scholarly journals Aluminum oxide carrier for a catalyst for low-temperature isomerization of hydrocarbons

2020 ◽  
Vol 15 (3) ◽  
pp. 58-69
Author(s):  
N. Tagandurdyyeva ◽  
N. V. Maltseva ◽  
T. A. Vishnevskaya ◽  
V. N. Narayev ◽  
A. Yu. Postnov
Keyword(s):  
Low Temperature ◽  
Polyvinyl Alcohol ◽  
Aluminum Oxide ◽  
High Selectivity ◽  
Ph Value ◽  
Strength Properties ◽  
Isomerization Reaction ◽  
Preparation Conditions ◽  
Constant Ph ◽  
Extrusion Method

Objectives. Determine the necessary conditions for obtaining a granulated η-Al2O3 carrier, investigate its structural and strength properties, and evaluate its activity for the model n-butane isomerization reaction.Methods. Samples containing bayerite structure aluminum trihydroxide were synthesized by precipitation from aqueous solutions of aluminum nitrate with ammonia under isothermal conditions at a constant pH value. The samples of the granulated carrier were obtained using an extrusion method when the composition of molding pastes was varied by tuning the ratio of bayerite- and η-Al2O3 -containing components and introducing polyvinyl alcohol.Results. The influence of the preparation conditions on the structural and strength properties of the active Al2O3 granules is evaluated. Samples of the aluminum oxide carrier were tested for a model reaction of low-temperature isomerization of n-butane, demonstrating a sufficiently high selectivity and reasonable prospects for use as catalysts for low-temperature isomerization of hydrocarbons.Conclusions. Increasing the content of the polyvinyl alcohol in the molding paste from 0.4 to 1.8 wt % is accompanied by an increase in the predominant sizes of the mesopores in the range of 10–50 nm and pores in the range of 50–80 nm, explaining the high values of all recorded parameters for the process of isomerization of n-butane.

Effect of Behavior Patch and Aging Adhesive Exposed with Temperature in Modeling of a Damaged and Repaired Plate in Aluminum (2024-T3)

2020 ◽  
Vol 50 ◽  
pp. 48-63
Author(s):  
Belghoul Hakima ◽  
Madani Kouider ◽  
Merdaci Slimane ◽  
Rezgani Laid
Keyword(s):  
Mechanical Properties ◽  
Finite Element Method ◽  
Stress Intensity Factor ◽  
Finite Element ◽  
Immersion Time ◽  
Absorption Rate ◽  
Shear Stresses ◽  
The Finite Element Method ◽  
Composite Patch ◽  
Temperature Water

This work consists of the study is to analysis by the finite element method the effect of the ageing of the adhesive exposed simultaneously to the temperature and water on the degradation of its mechanical properties and consequently on the transfer of loads from the plate to patch. The stress intensity factor was evaluated according to immersion time and temperature. Several parameters have been taken into consideration, namely the properties of the composite patch, temperature, water absorption, rate and length of crack, the distribution of maximum shear stresses in the adhesive and peel in the patch were also analyzed.

SYNTHESIS AND OPTICAL PROPERTIES OF WATER SOLUBLE ZnSe NANOCRYSTALS

2001 ◽  
Vol 15 (28n30) ◽  
pp. 3881-3884 ◽  
Author(s):  
N. Murase ◽  
M. Y. Gao ◽  
N. Gaponik ◽  
T. Yazawa ◽  
J. Feldmann
Keyword(s):  
Ph Value ◽  
Water Soluble ◽  
Final Solution ◽  
Blue Fluorescence ◽  
Wet Chemistry ◽  
Preparation Conditions ◽  
Transmission Electron ◽  
Mean Size ◽  
Surface Capping ◽  
Znse Nanocrystals

ZnSe nanocrystals are prepared in water by a wet chemistry method. By selecting an appropriate pH value and surface-capping agents, a whitish blue fluorescence peaking at 470 nm is observed under ZV irradiation. The intensity of this fluorescence increases dramatically under reflux and saturates after ~ 40 hrs. The final mean size of the ZnSe nanocrystals measured by transmission electron microscopy is aboyt 2 nm in diameter. The quantum efficiency of the fluorescence form the final solution is estimated to be ~1%, although the preparation conditions have not yet been completely optimized. These properties are discussed in comparison with those of similarly prepared CdTe and differently prepared ZnSe nanocrystals.

Preparation of Foam Glass Ceramics from Phosphorus Slag

2010 ◽  
Vol 105-106 ◽  
pp. 600-603 ◽  
Author(s):  
Ben Xu ◽  
Kai Ming Liang ◽  
J.W. Cao ◽  
Y.H. Li
Keyword(s):  
Glass Powder ◽  
Foam Glass ◽  
Glass Ceramics ◽  
Processing Parameters ◽  
Treatment Temperature ◽  
Homogeneous Distribution ◽  
Sintering Process ◽  
Foaming Agent ◽  
Foaming Temperature ◽  
Foam Glass Ceramics

Phosphorus slag could be used to prepare wollastonite glass ceramics. With the aid of incorporated foaming agent, foam glass ceramics can be obtained via the sintering of the slag-based glass. After the glass powder reacted with graphite, macro-size pores with homogeneous distribution were formed. The level of porosity of the fabricated foams was controlled by varying heat treatment temperature and amount of foaming agent. It was found that the preferential processing parameters for producing foam glass ceramics were foaming temperature of 1000°C with holding time of 10 min and 1 wt. % of graphite. In this case, the porosity reached about 80%. The results show that dominant crystalline phase is wollastonite, and the high compression strength results from the crystallization of glass during sintering process.

Hydrothermal Synthesis of GdVO4:Eu 3+ Phosphors by Optimizing its Preparation Conditions

2011 ◽  
Vol 287-290 ◽  
pp. 1360-1364
Author(s):  
Ying Lin Yan ◽  
Yun Hua Xu ◽  
Juan Wang ◽  
Zhen Xing Luan
Keyword(s):  
Ph Value ◽  
Photo Luminescence ◽  
Luminescence Spectroscopy ◽  
Temperature Reaction ◽  
Hydrothermal Temperature ◽  
Red Emission ◽  
X Ray ◽  
Preparation Conditions ◽  
Optimal Reaction Condition ◽  
Optimal Reaction

Eu3+ -doped GdVO4 powders have been synthesized via a novel hydrothermal method using commercially available Gd2O3, NH4VO3 and Eu2O3 as the reacting precursors. The influences of several important parameters, such as hydrothermal temperature, reaction time and pH value, of the experiment were investigated. The obtained samples were characterized by X-ray powder diffraction (XRD), field emission scanning electron microscopy (FESEM), and photo-luminescence spectroscopy (PL). The experimental results showed that the optimal reaction condition was processed at 180°C for 12 h and adjusted pH value to 4. The morphology of products was uniform pseudo-octahedron with a little conglomeration. All the phosphors exhibit the characteristic dominant red emission of Eu3+ ion (5D0 → 7F2) at 618nm.

scholarly journals The nanostructure of barium dititanate prepared by hydrothermal method

2019 ◽  
Vol 09 (02) ◽  
pp. 1950011
Author(s):  
Sarah L. Rasheed ◽  
Emad K. Al-Shakarchi
Keyword(s):  
Electron Microscopy ◽  
Reaction Time ◽  
Hydrothermal Method ◽  
Ph Value ◽  
Hydrothermal Process ◽  
Dielectric Ceramic ◽  
Lattice Constants ◽  
Preparation Conditions ◽  
Transmission Electron ◽  
Lcr Meter

The dielectric ceramic of barium dititanate compound BaTi2O5 had been prepared through the hydrothermal process by applying different parameters, such as pH-value, reaction time, temperature and pressure. The prepared powders were examined by X-ray diffraction (XRD). The predominant phase was a monoclinic phase with lattice constants ([Formula: see text], [Formula: see text], [Formula: see text] Å), ([Formula: see text], [Formula: see text]), and the unit cell volume (527 Å3). The surface morphology was demonstrated by Scanning Electron Microscopy (SEM). It exhibited the grains in spherical and elliptical shapes with high homogeneity. The shapes of nanostructure were analyzed by Transmission Electron Microscopy (TEM). The appearance of nanostructures like the nanoparticles and nano rods were found. The size of nanoparticles was in the range of 9–31[Formula: see text]nm, and size of nanorods was 32–37[Formula: see text]nm. The dielectric measurements were done by using LCR meter at different temperature and frequencies (10, 50 and 100[Formula: see text]kHz). It was clear that the Curie temperature had a high value up to (485∘C). The relative permittivity was partially changed for two prepared samples regarding high pressure and long reaction time, which were the main preparation conditions of hydrothermal method.

Controlled foaming of polycarbonate/polymethyl methacrylate thin film with supercritical carbon dioxide

2016 ◽  
Vol 30 (12) ◽  
pp. 1713-1727 ◽  
Author(s):  
Yuanxiang Luo ◽  
Yajun Ding ◽  
Changchun Wang ◽  
Linghua Tan ◽  
Sanjiu Ying
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Polymethyl Methacrylate ◽  
Saturation Pressure ◽  
Saturation Temperature ◽  
Mean Diameter ◽  
The Mean ◽  
Foaming Temperature ◽  
Supercritical Carbon ◽  
Foaming Time

The polycarbonate (PC)/polymethyl methacrylate (PMMA) (10/90) blends with microcellular foams were prepared by the two-step process using supercritical carbon dioxide as physical foaming agent. The effects of saturation temperature, saturation pressure, foaming temperature, and foaming time on the cell morphology structure were investigated by scanning electron microscopy. The results indicated that the mean diameter of cells in foamed PC/PMMA films decreased with the increment of saturation temperature and saturation pressure but increased with the increment of the foaming time. Moreover, the mean diameter of cells decreased first, but then increased with the increment of the foaming temperature. The cell density ( Nc) increased with the increment of saturation temperature and saturation pressure but decreased with the increment of the foaming time. However, the Nc increased first but then decreased with the increment of the foaming temperature.

The Research on Preparation of Modified Bentonite and Adsorption of Crystal Violet in Dyeing Wastewater

2012 ◽  
Vol 610-613 ◽  
pp. 1731-1734
Author(s):  
Yu Chen ◽  
Shun Sheng Yang ◽  
Zheng Jun Gong ◽  
Dong Mei Wang
Keyword(s):  
Crystal Violet ◽  
Ph Value ◽  
Mixing Time ◽  
Dyeing Wastewater ◽  
Preparation Temperature ◽  
Modified Bentonite ◽  
Preparation Conditions ◽  
Dodecyltrimethylammonium Chloride ◽  
Decoloration Rate

Dodecyltrimethylammonium chloride was used to modify na-bentonite in Sichuan Yanting. It was studied that the optimal modification conditions of bentonite and its optimum decoloration conditions of crystal violet in dyeing wastewater. The optimum preparation conditions were that the concentration of dodecyltrimethylammonium chloride was 1000mg /L, the preparation temperature was 70°C and the mixing time was 20 minutes. The optimum adsorption conditions for crystal violet were that the pH value was 8, the mixing time was 20 minutes and the dosing quantity of modified bentonite was 15 g/L. The decoloration rate was 85.4% under aforesaid conditions.

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