Zeolite Synthesis Using Sewage Sludge by Molten-Salt Method

2008 ◽  
Vol 569 ◽  
pp. 329-332
Author(s):  
Yeong Seok Yoo ◽  
Kyeong Ho Cheon ◽  
Jae Ik Lee ◽  
Beom Suk Kim ◽  
Woo Seob Shin ◽  
...  
Keyword(s):  
Sewage Sludge ◽  
Thermal Treatment ◽  
Molten Salt ◽  
Sodium Hydroxide ◽  
Treatment Time ◽  
Treatment Temperature ◽  
Zeolite Synthesis ◽  
Molten Salt Method ◽  
Synthesis Time ◽  
Zeolitic Materials

This study was conducted to synthesize zeolitic materials using sewage sludge by molten-salt method the effective method was investigate to reduce the thermal treatment time by adding zeolite seed and excessive sodium hydroxide. To synthesis zeolitic materials, sewage sludge was used as Si and Al sources, also Na2SO4 and NaOH were added as stabilizer and mineralizer respectively. Sewage sludge was prepared by calcination at 550°C/3hr to remove organic materials. As a result of thermal treatment at 950°C for 6~24hrs, more than 18 hours was required to synthesize zeolitic materials without adding zeolite seed. On the other hand, it is observed that hydroxyl-sodalite was synthesized in 9 hours thermal treatment and Na-P1 also in 12 hours when zeolite seed was added, but no other differences were observed when excessive sodium hydroxide was added. Consequently, the overall reaction time required could be reduced by adding zeolite seed and changing thermal treatment temperature. However, addition of NaOH does not show significant effect on the reduction of zeolite synthesis time.

Zeolite Synthesis Using Sewage Sludge by Molten-Salt Method

2008 ◽  
pp. 329-332
Author(s):  
Yeong Seok Yoo ◽  
Kyeong Ho Cheon ◽  
Jae Ik Lee ◽  
Beom Suk Kim ◽  
Woo Seob Shin ◽  
...  
Keyword(s):  
Sewage Sludge ◽  
Molten Salt ◽  
Zeolite Synthesis ◽  
Molten Salt Method

Development of Porous Materials Using Sewage Sludge by Molten-Salt Method

2008 ◽  
pp. 325-328
Author(s):  
Yeong Seok Yoo ◽  
Kyeong Ho Cheon ◽  
Jae Ik Lee ◽  
Beom Suk Kim ◽  
Woo Seob Shin ◽  
...  
Keyword(s):  
Sewage Sludge ◽  
Porous Materials ◽  
Molten Salt ◽  
Molten Salt Method

Low Temperature Preparation of Mullite Whisker via Non-Hydrolytic Sol-Gel Process Combined with Molten Salt Method

2014 ◽  
Vol 936 ◽  
pp. 975-980 ◽  
Author(s):  
Kai Lin Fu ◽  
Wei Hui Jiang ◽  
Guo Feng ◽  
Jian Min Liu ◽  
Qian Wu ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Low Temperature ◽  
Molten Salt ◽  
Sol Gel ◽  
Growth Direction ◽  
Treatment Temperature ◽  
Molten Salt Method ◽  
Low Temperature Preparation ◽  
Sol Gel Process ◽  
Temperature Preparation

Mullite whisker was prepared at low temperature via non-hydrolytic sol-gel (NHSG) process combined with molten salt method. The influence of heat treatment temperature was studied on the morphology and the microstructure of whisker, and its growth mechanism was also described. The results show that the mullite whisker appears at the lowest temperature of 750 °C, and optimized mullite whisker can be prepared at 850 °C with the growth direction of [00, whose diameter is in the range of 170~300 nm with the aspect ratio of >30.

Ceramic Material from Sewage Sludge as Support Material Supply Water Filtration

2012 ◽  
Vol 727-728 ◽  
pp. 1398-1401
Author(s):  
Leandro C. Morais ◽  
A.H. Rosa ◽  
L.F. Fraceto ◽  
A.C.T. Toledo ◽  
V. Campos
Keyword(s):  
Water Treatment ◽  
Sewage Sludge ◽  
Thermal Treatment ◽  
Filter Material ◽  
Treatment Temperature ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
Material Supply ◽  
Treated Sewage ◽  
High Standards

This study shows a possibility of using municipal sewage sludge after thermal treatment in the production of a filtering material to water treatment. Due to the fast urbanization and implementation of high standards for effluent in many countries in recent years, the sewage sludge is being produced in an ever increasing amount. Therefore, the use of sludge is a suitable solution for the expected large quantity of sludge. Dehydration of sludge was performed by controlled heating at temperatures of 1100°C, 850°C, 650°C, 350°C for 3 hours. After thermal treatment the sludge was characterized by X-ray fluorescence, TG/DTG/DTA, residue solubilization and residue lixiviation tests. The aim of the present work was to observe, thought the characterization techniques, if the treated sewage sludge is or not adequate to be used as filter material to water treatment. It will be verified which treatment temperature of the sludge offer possibility to its use in water treatment without carrying pollutants in concentrations out of the standards.

scholarly journals Facile preparation of ZrO2 whiskers by LiF-KCl molten salts synthesis

2021 ◽  
Vol 15 (3) ◽  
pp. 219-225
Author(s):  
Quan Zhang ◽  
Guo Feng ◽  
Feng Jiang ◽  
Jianmin Liu ◽  
Lifeng Miao ◽  
...  
Keyword(s):  
Molten Salt ◽  
Lithium Fluoride ◽  
Slow Rate ◽  
Molten Salts ◽  
Treatment Temperature ◽  
Molten Salt Method ◽  
Monoclinic Zirconia ◽  
Zirconyl Chloride ◽  
Aspect Ratios ◽  
Dissolution And Precipitation

Monoclinic zirconia (ZrO2) whiskers were made via the molten salt method using zirconyl chloride octahydrate (ZrOCl2 ? 8H2O) as zirconium source, potassium chloride (KCl) as molten salt and lithium fluoride (LiF) as a mineraliser. DSC-TG, XRD, FE-SEM, Raman and TEM were performed to study the effects of heat treatment temperature, holding time and heating rate on the synthesis of zirconia whiskers. The results indicate that zirconia whiskers with diameters of 50-80 nm and aspect ratios of 10-30 can be obtained by heating the precursor at slow rate (3?C/min) to 718?C for 1 h and then at faster rate (7?C/min) to 950?C for 3 h. The whiskers have a smooth surface and grow in [001] direction. The key to the ZrO2 whiskers growth is the controlled dissolution and precipitation of the ZrO2 in a LiF-KCl molten salt solution environment.

Molten-salt method for the synthesis of zeolitic materials

2000 ◽  
Vol 37 (1-2) ◽  
pp. 81-89 ◽  
Author(s):  
Man Park ◽  
Choong Lyeal Choi ◽  
Woo Taik Lim ◽  
Myung Chul Kim ◽  
Jyung Choi ◽  
...  
Keyword(s):  
Molten Salt ◽  
Molten Salt Method ◽  
Zeolitic Materials

Study on Thermal Isomerization of Isopimaric Acid

2013 ◽  
Vol 634-638 ◽  
pp. 440-444 ◽  
Author(s):  
Yu Xiang Chen ◽  
Zhen Dong Zhao ◽  
Yan Gu ◽  
Yan Ju Lu
Keyword(s):  
Thermal Treatment ◽  
Treatment Time ◽  
Decomposition Reaction ◽  
Thermal Isomerization ◽  
Treatment Temperature ◽  
Isomerization Reaction ◽  
Isopimaric Acid ◽  
Isomerization Rate ◽  
Isomerization Mechanism ◽  
Sandaracopimaric Acid

The thermal isomerization reaction of isopimaric acid was studied by a treatment at different temperature of 250 °C, 260 °C and 270 °C for 1-5 h under the protection of nitrogen. The isomerization mechanism of isopimaric acid was illuminated. Isopimaric acid was remarkably isomerized to 8, 15-isopimaric acid and sandaracopimaric acid, the higher thermal treatment temperature combined with longer thermal treatment time, the faster isomerization rate of isopimaric acid was observed. It was found that the isomerization rate of isopimaric acid towards 8, 15-isopimaric acid was faster than to sandaracopimaric acid. The decomposition reaction of pimaric-type acids occurred slightly in conditions of 250 ~ 270 °C.

The Influence of SiC Powder Source on 6H-SiC Single Crystals Grown by the Sublimation Method

2006 ◽  
Vol 527-529 ◽  
pp. 91-94 ◽  
Author(s):  
Jae Woo Kim ◽  
Soo Hyung Seo ◽  
Kwan Mo Kim ◽  
Joon Suk Song ◽  
Tae Sung Kim ◽  
...  
Keyword(s):  
Thermal Treatment ◽  
High Purity ◽  
Doping Concentration ◽  
Growth Stage ◽  
Treatment Time ◽  
Alpha Phase ◽  
Treatment Temperature ◽  
Initial Growth ◽  
Thermal Treatment Temperature ◽  
Sublimation Method

We examined the influence of thermal treatment of high-purity SiC powder on 6H-SiC crystal growth. The doping concentration was decreased by increasing either thermal treatment temperature or time. It was also found that the defects such as micropipes and planar cavities were generated under relatively long treatment time (13 hours), because SiC powders were significantly graphitized. A 6H-SiC crystal grown by using SiC source treated at 2100oC for 6 hours revealed the best result with relatively low micropipes. For the effects of thermal treated sources on the improvement of crystallinity, it could be explained that both the amount of alpha phase transformed from high-purity beta-SiC powder and the elimination of porous powders in SiC powder had an influence on the removal of silicon droplets, resulting in higher Si vapor pressure at the initial growth stage.

Development of Porous Materials Using Sewage Sludge by Molten-Salt Method

2008 ◽  
Vol 569 ◽  
pp. 325-328
Author(s):  
Yeong Seok Yoo ◽  
Kyeong Ho Cheon ◽  
Jae Ik Lee ◽  
Beom Suk Kim ◽  
Woo Seob Shin ◽  
...  
Keyword(s):  
Sewage Sludge ◽  
Porous Material ◽  
Molten Salt ◽  
Surface Area ◽  
Cation Exchange Capacity ◽  
Exchange Capacity ◽  
The Other ◽  
Artificial Soil ◽  
Molten Salt Method ◽  
Area Distribution

This study is about the development of porous material which shapes Ø3~8mm bead with sewage sludge by molten-salt method. The development of porous material was conducted by 2 different processes. One is made by molding sewage sludge into beads with pelletizer and then coating the beads with molten-salt and lastly sintered at 1050°C, and the other is mixing sewage sludge with molten-salt which is using synthesized zeolite, and then molding the mixture into beads with pelletizer. The molded mixture is finally sintered at 1050°C. We evaluated the value of developed material as sorbent and artificial soil for tree-planning by analyzing surface area, distribution of pore size, and cation exchange capacity(CEC). According to the results, surface coated porous material have 92.8m2/g of surface area and CEC 98.9meq/100g and the mixture sewage sludge with molten-salt have 104.1m2/g of surface area and CEC 140.8meq/100g. Thus, developed porous material can be applied to various uses as sorbent and artificial soil.

Molten-salt method for the synthesis of zeolitic materials

2000 ◽  
Vol 37 (1-2) ◽  
pp. 91-98 ◽  
Author(s):  
Man Park ◽  
Choong Lyeal Choi ◽  
Woo Taik Lim ◽  
Myung Chul Kim ◽  
Jyung Choi ◽  
...  
Keyword(s):  
Molten Salt ◽  
Molten Salt Method ◽  
Zeolitic Materials
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