SINTESIS DAN KARAKTERISASI GAMMA ALUMINA (γ-Al2O3)  DARI KAOLIN ASAL TATAKAN, SELATAN BERDASARKAN VARIASI TEMPERATUR KALSINASI

Irawati, Utami; Sunardi, Sunardi; Suraida, Suraida

doi:10.20884/1.jm.2013.8.1.123

Cited by 4 publications

(4 citation statements)

References 10 publications

(12 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Mullite is formed at temperatures of 850°C-1,000°C and has a melting point of 2,083 K or 1. 890 o C. Coal accompanied by the addition of zeolite has a greater AFT value [10]. The increase in the value of Ash Fusion Temperature will certainly affect the Slagging Index Price owned by coal, especially for Deformation Temperature (DT) and Flow Temperature (FT) [12].…”

Section: Figure 1 Ash Analysis Chartmentioning

confidence: 99%

Increased Coal Slagging Index by Using Zeolite Synthetic

Idi Amin,

Muh. Zulfikri Syahbar

2023

SAGA

View full text Add to dashboard Cite

The use of coal as fuel has experienced several obstacles, one of which is the formation of Slagging (crust). Slagging is formed by the melting point of coal ash or low ash fusion temperature, caused by low levels of Al2O3 in coal ash. The addition of synthetic zeolite to coal before use is intended to increase the level of Al2O3, so that it will increase the ash fusion temperature of coal ash. The increase in ash fusion temperature also causes an increase in the slagging index of coal. With the high increase in the slagging index obtained, the lower the potential for the formation of slagging. The smaller the potential of Slagging formed, the use of coal also decreases. This study aims to determine the effect of adding waste-based synthetic zeolite to coal ash on increasing coal slagging index. Research uses a type of experimental research. Itis collected by conducting laboratory tests, namely making observations and direct testing of samples with variations in the addition of synthetic zeolite to coal by 5%, 10%, and 15%. The results showed that synthetic zeolite added to coal was able to reduce the potential for slagging formation. Slagging index from the results of research for oxidation conditions is a standard sample of 1,246oC, SBZ5 by 1,242oC, SBZ10 by 1,250oC, and SBZ15 by 1,274oC. Reduction conditions i.e. standard sample of 1,130oC, SBZ5 by 1,116oC, SBZ10 by 1,136oC, and SBZ15 by 1,168oC. SBZ15 sample is a variation that has a good slagging index, which is for oxidation conditions which is 1,274oC, and for reduction conditions that is 1,168oC

show abstract

Section: Figure 1 Ash Analysis Chartmentioning

confidence: 99%

Increased Coal Slagging Index by Using Zeolite Synthetic

Idi Amin,

Muh. Zulfikri Syahbar

2023

SAGA

View full text Add to dashboard Cite

show abstract

“…The cation intercalant Fe probably requires a higher heating temperature and a longer time to completely change into pilar oxide form. However, it should also be considered that heating (calcination) at too high a temperature can cause structural damage to the clay (Irawati et al, 2013).…”

Section: Swelling Volume and Water Content Of Clay After Dryingmentioning

confidence: 99%

Intercalation and calcination as methods to reduce expansive soil properties

Wiratama

Hanudin

Purwanto

2021

Sains Tanah J. Soil Sci. Agroclimatology

View full text Add to dashboard Cite

The expansive ability of soil causes a series of problems in various sectors. The dominance of smectite clay minerals significantly affects expansive ability because they have an unstable interlayer structure. Cation intercalation and calcination is a treatment method that can increase the stability of the clay interlayer structure. This research investigated the effects of intercalation cations and calcination treatment on the swelling ability and cracking properties in the clay from vertisols; the cations used for intercalation were aluminum and iron. The intercalation tested doses were based on the equivalent weight of 0x, 0.5x, and 1x cation exchange capacity (CEC) clay value. The calcination treatments used were 200°C, 300°C, and no calcination. Each treatment interaction was repeated three times. Parameters observed were the total area, average crack width, average lump area, total number of lumps, moisture content, swelling volume, and pH after treatment. The results showed that each treatment had a significant effect. Clay with an Al intercalation dose of 1x CEC without calcination treatment had the highest total area after drying, which was 41.035 cm2; the lowest average crack width was 0.153 cm, and the smallest swelling volume was 3.6 cm3. In contrast, the clay without intercalation and calcination treatments had a swelling volume up to 10 cm3 on the 7th day. The clay with an Al intercalation dose of 1x CEC with 200°C calcination exhibited the best results in reducing the expansive clay ability and can be used as a guideline for further testing to reduce the soil’s expansive ability.

show abstract

“…The process applying it on the surface by sol-gel technique [11]. Following the alumina crystal structure, it has a very stable form, namely α-Al 233 [12]. The general method applied to prepare γ-alumina is sol-gel technique.…”

Section: Introductionmentioning

confidence: 99%

“…The sol-gel process is a phase change from colloidal (sol) suspension to form a continuous liquid phase (gel) based on hydrolysis and condensation reactions on alkoxide or metalloid transition metal compounds [11]. The sol gel method is a good method because it can produce particles with a large surface area, high purity, good thermal stability, and high mechanical stability [12]. The parameters influence the sol-gel method include acidity or pH condition during synthesis and also the aging time.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Acidity and Aging Time in The Synthesis of Al(OH)3 from The Anodized-waste with a Sol-Gel Method

Wardhani

Purwonugroho

Permatasari

et al. 2019

J. Pure App. Chem Res

View full text Add to dashboard Cite

Synthesis of alumina has been carried out by utilizing anodized waste as raw material. Anodized waste is a by-product of metal anodizing processes such as aluminium. This study aims to determine the effect of acidity (pH) and aging time on the mass of Al(OH)3 and the property of Al(OH)3 as well as Al2O3 that produced. Anodized waste was deposited into Al(OH)3 and then purified. Alumina synthesized by the sol-gel method with pH variations of 7, 8, 9, and 10 and aging times of 24, 48, and 72 hours. The Al(OH)3, which has been produced, was characterized by PSA and powder XRD spectrophotometer. The results showed that the synthesis of Al(OH)3 was influenced by pH and aging time. It affects the yield and particle size of Al(OH)3. The optimum condition of the synthesis was pH 7 and aging time of 24 hours with yield of 1.85 grams. Characterization by PSA at a current diameter of 90% indicate that higher pH value and longer aging time produces smaller particle size. Characterization by powder XRD shows that the Al(OH)3 has gibbsite crystal phase with d values of 3.360, 3.217, 2.252, 2.029, and 1.649 Å.

show abstract

SINTESIS DAN KARAKTERISASI GAMMA ALUMINA (γ-Al2O3) DARI KAOLIN ASAL TATAKAN, SELATAN BERDASARKAN VARIASI TEMPERATUR KALSINASI

Cited by 4 publications

References 10 publications

Increased Coal Slagging Index by Using Zeolite Synthetic

Increased Coal Slagging Index by Using Zeolite Synthetic

Intercalation and calcination as methods to reduce expansive soil properties

The Effect of Acidity and Aging Time in The Synthesis of Al(OH)3 from The Anodized-waste with a Sol-Gel Method

Contact Info

Product

Resources

About