On the Use of Crushed Recycled Glass Instead of Silica Sand in Dual-Media Filters

2013 ◽  
Vol 41 (4) ◽  
pp. 325-332 ◽  
Author(s):  
Elif Soyer ◽  
Ömer Akgiray ◽  
Nursen Öz Eldem ◽  
Ahmet Mete Saatçı
Keyword(s):  
Silica Sand ◽  
Recycled Glass

Influence of Type of Secondary Raw Material on Consistency of Fresh Mixture for AAC Production

2020 ◽  
Vol 998 ◽  
pp. 305-310
Author(s):  
Vit Černý ◽  
Matěj Lédl ◽  
Jindřich Melichar ◽  
Rostislav Drochytka
Keyword(s):  
Production Technology ◽  
Raw Materials ◽  
Bottom Ash ◽  
Silica Sand ◽  
Partial Replacement ◽  
Load Bearing ◽  
Recycled Glass ◽  
Coal Slag ◽  
Aerated Concrete ◽  
Partial Weight

Autoclaved aerated concrete (AAC) is, mainly in Europe, widely used construction material. It has an optimal combination of bulk density, strength and thermal conductivity coefficient for load-bearing and non-load-bearing structures of civil facilities. The production technology is based on a mixture of ground silica sand, lime, cement, gypsum, aluminium powder and additives. The grinding of sand is most often carried out in a wet way, and the sand sludge is consequently used in production technology. The aim of the experiment was verification of the effect of partial replacement of sand with the alternative raw materials in sand sludge on the rheology of the mixture. This parameter determinates how the modified mixtures affect the sludge pumpability. As a reference the consistency of the sand sludge of the normal production density of 1.65 g/cm3 was compared to the sand sludges of different density (1.60, 1.70 and 1.75 g/cm3) and with a fresh aerated concrete (FAC) mixture of 1.60 g/cm3. Then the sludges were modified by 30 % of alternative raw materials (recycled glass, coal slag, FBC ash, FBC bottom ash) as the partial weight replacement for sand. This partial replacement resulted in water/solids ratio adjustment which recommended value is 0.47 for recycled glass and coal slag, 0.59 for fluidized bed combustion (FBC) bottom ash and for FBC fly ash it is 0.70.

Crushed recycled glass as a filter medium and comparison with silica sand

2010 ◽  
Vol 38 (10) ◽  
pp. 927-935 ◽  
Author(s):  
Elif Soyer ◽  
Ömer Akgiray ◽  
Nursen Öz Eldem ◽  
Ahmet Mete Saatçı
Keyword(s):  
Filter Medium ◽  
Silica Sand ◽  
Recycled Glass

Partial and Full Replacement of Silica Sand by Fine Recycled Glass in Cementitious Composites

2018 ◽  
Vol 6 (2) ◽  
pp. 91-98
Author(s):  
Sallal R. Abid ◽  
Sajjad H. Ali ◽  
Ahmed L. Kadhum ◽  
Yasir H. Daek
Keyword(s):  
Compressive Strength ◽  
Construction Industry ◽  
Waste Glass ◽  
Modulus Of Rupture ◽  
Silica Sand ◽  
Cementitious Composites ◽  
Test Results ◽  
Recycled Glass ◽  
Fine Glass ◽  
Adequate Management

One of the major concerns currently and within the close future is the adequate management and efficient reuse and recycling of wastes, which reduces the natural sources and energy consumption. Millions of tons of waste glass are discharged around the world annually. One of the successful policies of the recycling of waste glass is the use in the construction industry where it can be used as aggregate or cement replacement. In the current study, fine recycled glass with granular size of 0.075 to 0.3 mm was used as silica sand replacement in cementitious composites incorporated fly ash and no coarse aggregate. Cube and prism specimens were prepared with four replacement ratios of 0, 25, 50, and 100% to evaluate the compressive strength, the modulus of rupture, and the expansion. The test results showed that 50% and 100% replacements of silica sand by fine glass enhanced both the compressive strength and the modulus of rupture. For mixtures with 100% fine recycle glass, the compressive strength and the modulus of rupture increased by 25% and 33.6%, respectively, compared to mixtures with 100% silica sand. Moreover, the expansion was found to be reduced by approximately 30% as the silica sand was fully replaced by fine glass.

scholarly journals Use of filterability index in granular filtration: effect of filter medium type, size and shape

2018 ◽  
Vol 19 (2) ◽  
pp. 382-391
Author(s):  
Selda Yiğit Hunce ◽  
Elif Soyer ◽  
Ömer Akgiray
Keyword(s):  
Preliminary Test ◽  
Filter Medium ◽  
Silica Sand ◽  
Water Filtration ◽  
Recycled Glass ◽  
Filter Performance ◽  
Type Size ◽  
Filtration Effect ◽  
Granular Filtration ◽  
Medium Type

Abstract Ives' Filterability Index (FI) was employed to evaluate silica sand versus crushed recycled glass as a rapid filter media. The presence of past studies comparing these two media allows an evaluation of the applicability and utility of the FI concept as a simple and quick preliminary test for the assessment of different media to be used in water filtration. The present tests also allow an evaluation of the effect of shape on filter performance.

Silicon Tetrachloride Synthesis from Rice Hulls: Transmission and Scanning Electron Microscope Study

1972 ◽  
Vol 30 ◽  
pp. 236-237 ◽  
Author(s):  
Richard S. Thomas ◽  
Prabir K. Basu ◽  
Francis T. Jones
Keyword(s):  
Silicon Tetrachloride ◽  
Silica Sand ◽  
Mineral Matter ◽  
Chemical Heterogeneity ◽  
Scanning Electron Microscope Study ◽  
Rice Hulls ◽  
Hull Structure ◽  
Lower Temperature ◽  
Image Position ◽  
Disposal Problem

Silicon tetrachloride, used in industry for the production of highest purity silicon and silica, is customarily manufactured from silica-sand and charcoal.SiCl4 can also be made from rice hulls, which contain up to 20 percent silica and only traces of other mineral matter. Hulls, after carbonization, actually prove superior as a starting material since they react at lower temperature. This use of rice hulls may offer a new, profitable solution for a rice mill byproduct disposal problem.In studies of the reaction kinetics with carbonized hulls, conversion of SiO2 to SiCl4 was found to proceed within a few minutes to a constant, limited yield which depended reproducibly on the ambient temperature of the reactor. See Fig. 1. This suggested that physical or chemical heterogeneity of the silica in the hull structure might be involved.

MEASUREMENT OF DARCY AND FORCHHEIMER COEFFICIENTS FOR SILICA SAND BEADS

2006 ◽  
Vol 10 (1) ◽  
pp. 55-78 ◽  
Author(s):  
W. Bussiere ◽  
D. Rochette ◽  
T. Latchimy ◽  
G. Velleaud ◽  
P. Andre
Keyword(s):  
Silica Sand

Pengaruh Penggunaan Batu Basalt Lampung dan Batubara dalam Bahan Baku terhadap Karakteristik Klinker

2020 ◽  
Vol 10 (1) ◽  
pp. 49
Author(s):  
Suharto Suharto ◽  
Muhammad Amin ◽  
Muhammad Al Muttaqii ◽  
Syafriadi Syafriadi ◽  
Kiki Nurwanti
Keyword(s):  
Experimental Study ◽  
Raw Materials ◽  
Coal Ash ◽  
Heating Time ◽  
Raw Material ◽  
Silica Sand ◽  
Cement Clinker ◽  
Duration Of Heating

Experimental study on the use of basalt stone originated from Lampung has been conducted to evaluate its potential for a partial substitute of raw material in production of cement clinker. The basalt stone contains minerals of anorthite, augite, and albite phases that are required for clinker formation. In this study, the main raw materials were 80% limestone, 10% silica sand, 9% clay and 1% iron sand. The raw material in these experiments were mixtures 90% or 80% of the main raw material and 10% or 20% of basalt stone. The effect of adding coal to raw materials was also studied to see the possibility of an increase in clinkerization temperature inside the raw material mixture, and at the same time to see the effect of coal ash on clinker composition. Clinker obtained from heating of raw materials at a temperature of 1100oC had LSF of 94.1% and 95.1% (heating time of 1 and 3 hours). If heating is carried out at 1200oC, the clinker had LSF of 97.7% and 98.0% (heating time of 2 and 3 hours, respectively). Depending on the temperature and duration of heating, the clinker mostly had SM in the range of 2.18-2.40% , and AM in the range of 0,78-1.80%. Characterization using XRD showed that the clinker consisted of larnite and gehlenite phases, and dominated by CaO.Batu basalt Lampung telah diuji potensinya sebagai pengganti sebagian bahan baku utama pembuatan klinker semen. Batu basalt tersebut memiliki mineral-mineral dalam fase anorthite, augite, dan albite yang diperlukan pada pembentukan klinker. Pada penelitian ini, bahan baku utama adalah batu kapur 80%, pasir silika 10%, tanah liat 9% dan pasir besi 1%. Campuran bahan baku klinker adalah 90% atau 80% bahan baku utama dan 10% atau 20% batu basalt. Efek penambahan batubara ke dalam bahan baku klinker juga dipelajari untuk melihat kemungkinan kenaikan temperatur klinkerisasi di dalam campuran bahan baku, dan sekaligus untuk melihat efek abu batubara terhadap komposisi klinker. Klinker hasil pemanasan bahan baku pada temperatur 1100oC memiliki LSF 94,1% dan 95,1% (lama pemanasan 1 dan 3 jam). Jika pemanasan dilakukan pada 1200oC, klinker memilik LSF 97,7% dan 98,00% (lama pemanasan 2 dan 3 jam). Tergantung pada temperatur dan lama pemanasan, klinker hasil percobaan ini umumnya memiliki SM 2,18-2,40%, dan AM antara 0,78-1,80%. Karakterisasi dengan XRD menunjukkan bahwa klinker terdiri dari fase larnite dan gehlenite, dan didominasi CaO.

Comparison of Nodular Efficiencies Between Partridge Pea and Soybean Using Acetylene Reduction

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 449f-450
Author(s):  
Lisa M. Barry ◽  
Michael N. Dana
Keyword(s):  
Growth Rate ◽  
Plant Size ◽  
Silica Sand ◽  
Soybean Plant ◽  
Fibrous Root ◽  
Constant Growth Rate ◽  
Soil Microbial ◽  
Soybean Plants ◽  
Nurse Crops ◽  
Partridge Pea

Legumes are grown as nurse crops in agriculture because they increase soil microbial life and productivity. Native legumes have potential in ecological restoration to mimic the benefits found in agriculture plus they enhance the restored ecosystem. This study was initiated to compare the growth rates, nodulation characteristics, and nitrogen fixation rates of a native versus a non-native legume. The two legumes were partridge pea (Cassia fasciculata); a native, wild, annual legume and soybean (Glycine max `Century Yellow); a domesticated, agricultural, annual legume native to Asia. Plants were grown for 11 weeks in pots containing silica sand and received a nitrogen-free Hoagland's nutrient solution. Beginning at week 12, plants were harvested weekly for four consecutive weeks. Nodulated root systems were exposed to acetylene gas and the resulting ethylene amounts were measured. The two legumes exhibited significant differences in nodule size and shape and plant growth rate. In soybean, nodules were large, spherical, and clustered around the taproot while in partridge pea, nodules were small, irregularly shaped, and spread throughout the fibrous root system. Soybean plants had a significantly faster growth rate at the onset of the experiment but partridge pea maintained a constant growth rate and eventually exceeded soybean plant size. In spite of these observed differences, partridge pea and soybean plants were equally efficient at reducing acetylene to ethylene. These results indicate partridge pea has the potential to produce as much nitrogen in the field as soybean. Native legumes such as partridge pea deserve further research to explore their use as nurse crops in agricultural or restoration regimes.

Adaptation of the AOAC Fluorine Method for Determining Fluoride in Fish Protein Concentrate

1970 ◽  
Vol 53 (1) ◽  
pp. 3-6
Author(s):  
R. Bruce Klemm ◽  
Mary E. Ambrose Klemm
Keyword(s):  
Steam Distillation ◽  
Silica Sand ◽  
Official Method ◽  
Protein Concentrate ◽  
Fish Protein ◽  
Direct Titration ◽  
Modified Method ◽  
Aoac Official ◽  
Aoac Official Method

Abstract The AOAC official method, 24.029–24.035, for the determination of fluorine in foods was modified slightly to o btain quantitative recoveries of fluorine from samples of fish protein concentrate (FPC). The most important alterations include the use of steam distillation, the addition of finely ground silica sand in the distillation, a decrease in the distillation temperature, and the utilization of direct titration. Recoveries of fluoride added to FPC before ashing, using this modified method, averaged 96.0 ± 3.0%. Our results are in agreement with those of several other analysts who used a variety of methods.

Sign in / Sign up

Export Citation Format

Share Document