Characteristics Of Rice Husk Research Articles

SINTESIS SILIKA GEL DARI LIMBAH SEKAM PADI (Oryza Sativa) DENGAN VARIASI KONSENTRASI JENIS ASAM

Rice Husk Ash (RHA) is a material that has the potential to be used in Indonesia because of its high production with sampling results during the rice milling process which produces quite a lot of waste, which is equal to 20% of the grain weight with the characteristics of rice husk which is coarse, has low nutritional value, has a high density. low and high ash content. The high content of silica in rice husk can be a reference for its use as a raw material for making silica. Through this research the authors did this to determine variations in the concentration of acid types on the quality of the water content (%) of the resulting silica gel and to determine the characteristics of acid type silica gel. After conducting research using quantitative methods through data collection and data processing, it was found that the concentration of various types of hydrochloric acid (HCl) had a higher level of water content than the type of citric acid (C6H8O7), obtained the concentration of 9 M, while the FTIR test results showed that silica in the type of acid used contained OH groups which identified silanol (SI-OH) absorption range 3450 - 3550 cm-1 and siloxane functional groups (Si-O) absorption ranges of Si-O functional groups, namely 1075 - 1095 cm-1.

Strength Characteristics of Rice Husk and Corn Cob Ash Blended Cement Concrete

The study investigates the mechanical properties of concrete incorporating Rice husk Ash (RHA) and Concorb Ash (CCA) as cementitious binders. Concrete cubes was prepared from a standardized prescribed mix of 1:2:4. The cement component in the reference mix was replaced with combined % weight of rice husk ash and corncob ash. The physical and chemical composition of RHA and CCA were examined as well as the workability and compressive strength properties of varying percentage of RHA and CCA blended cement concrete. Water–cement ratios of 0.6, was adopted for the reference and blended mixes. A total of 75 concrete cubes of different percentages by weight of combination of RHA and CCA to Portland cement in the order of 0%, 10%, 20%, 30%, and 40% were cast. The strength measurements of concrete were performed at the ages of 7, 14, 21, 28 and 56 days. The results revealed that compressive strength increased with increase in curing age but decreased as the RHA and CCA contents increased. The compressive strength of concrete cubes with the combination of RHA and CCA was lower at early stages but improves significantly up to 56 days. The highest compressive strength was 22.94N/mm2 and 26.27N/mm2 at 56 days for 0% and 10% combination of RHA and CCA respectivelyBased on the test results the study concluded that 10% RHA and CCA content is adequate as supplementary cementitious material for blended concrete.

Surface morphology and structural characteristics of rice husk, its biochar and vermicompost

Surface morphology and structural characteristics of rice husk, its biochar and vermicompost

Research on carbonised process characteristics of biomass

In this paper, the carbonation characteristics of rice husk carbonised in the special laboratory carbonation furnace were studied. The biochar production rate and composition and content of gas under different conditions of temperature and carbonisation time were investigated. Meanwhile, reference coal gas calorific value calculation put forward and confirmed the biomass pyrolysis gas calorific value calculation formula. The results showed that temperature and carbonisation time both have different influence on the pyrolysis process. Among them, 450–500°C, ∼10 min was the best condition for biochar production; biochar yield was 40·28%. While under this condition, the combustible gas generated the highest value, it can reach 16 137·046 kJ m−3. It can provide the basis for further study of accuracy control and online monitoring of biochar production and improvement of the carbonisation furnace.

Experimental and Simulation Studies on Milling of Rice Husk

A study was conducted to investigate the size reduction characteristics of rice husk in a batch ball mill. The most popular population balance model was chosen for the analysis. The model parameters are the breakage distribution function (β) and breakage rate function (α). Experiments are conducted with three different feed sizes of rice husk at three different ball charges. From the experimental data, the best fitting breakage distribution function parameter is found. The breakage rate function parameters with process variables such as feed size, ball charge were calculated. The best correlation for the parameter with process variables was obtained by multiple linear regression analysis. Additional experiments were also conducted at different process conditions to verify the correlation. The accuracy of the correlation is also verified for pet coke data of Ray (2000). The correlation describes the experimental data with acceptable accuracy for rice husk and also for pet coke data within the range of process variables studied in this investigation. The calculated values of the breakage rate obtained through the developed correlations have been compared with the respective experimental values with root mean square error of 1.25% and correlation coefficient of 0.95. It is also found that the calculated values agree well with the experimental values.

Study on Utilization of Biomass in Light-Weight Aggregate Production

In this paper, the property of common biomass-rice husk was compared with that of coal. The combustion characteristics of rice husk were investigated by Thermogravimetry (TG) method, and the barriers for biomass fuels utilization as an alternative fuel to manufacture artificial aggregates were also analyzed. The key techniques of using biomass as an alternative fuel in light-weight aggregate production, such as preprocessing of the biomass feedstock, proper design of combustion system for biomass fuel and control of sintering process were proposed. Properties of artificial aggregates sintered by biomass fuel were also studied according to GB/T 17421.2-2010 test method, and the test results showed that all the properties meet the requirement of national standard.

Comparison of the Combustion Characteristics of Rice Husk, Sawdust, and Groundnut Shells in a Bubbling Fluidized Bed

Agricultural residues, such as rice husk, sawdust, wood waste, groundnut shells, etc., could play an important role as energy sources. These biomass fuels are difficult to handle due to high moisture and fines content and also due to fuel ash softening at relatively low temperatures. Fluidized bed energy technology offers several unique characteristics for using biomass in small-scale energy conversion operations. In the present work, combustion studies of rice husk, sawdust, and groundnut shells were conducted in an atmospheric bubbling fluidized bed in high excess air environment and observed considerable reduction in CO levels in flue gases and unburned carbon in residual ash. The combustion efficiency, temperature distribution in the reactor, ash characteristics, etc. are also studied in a fluidized bed at various operating conditions. Secondary air is introduced in the enlarged free board to provide high turbulence for flue gases and unburned particles in the reactor vessel.

The Drying Characteristic of Biomass with High Moisture Content

This paper presents the drying characteristics of rice husk and cornstalk with high moisture content at fixed temperatures. Experiments were performed in an oven drier, to reveal to the effects of initial moisture content, bed thickness and drying temperature on the biomass drying characteristics. The results indicated that the drying time was decreased as the rising of the drying temperature, and increased along with the initial moisture content and bed thickness. Moreover, the risk husk was easy to be dried than the cornstalk.