Grate-Rotary Kiln Pellet Technology of Chromite Concentrate and Study on Mass Balance Calculation

2013 ◽  
Vol 634-638 ◽  
pp. 3355-3362
Author(s):  
Dai Jun Wang ◽  
Sheng Li Wu
Keyword(s):  
Mass Balance ◽  
Rotary Kiln ◽  
Bulk Material ◽  
Material Loss ◽  
Mass Balance Calculation ◽  
Agglomeration Process ◽  
Carbon Ferrochrome ◽  
Chromite Concentrate ◽  
Drop Number ◽  
Oxidation Loss

The grate-rotary kiln pellet process of chromite concentrate, which is not only complying with the chrome ore agglomeration process, but also meeting the development of grate-rotary kiln pelletizing technology, and is an effective mearsure of increasing use of high-carbon ferrochrome as well. In this work, aiming at study on grate-rotary kiln pellets of 0.3Mtpa chromite concentrate’s mass balance calculations, the results show when the material is in the specific surface area of 1700cm2/g, the compressive strength of 11 N per pellet, drop number of 5 times from 0.5m height and cracking temperature of 435°C are achieved, especially cracking temperature is higher than the highest temperature of grate DDD 400°C. Measuring and calculation of dehydration loss, ash content and bulk material loss, as well as reduction loss and oxidation loss of coke powder of the green pellet are achieved. The reduction degrees of FeO and Cr2O3 are 68.06% and 52.24% respectively, and comprehensive reduction degree is 58.52%. In this research, the mass balance table of payments of the grate-rotary kiln system is listed, and a detailed mass balance diagram is also obtained.

Theoretical Assessment of a Porous Core Photonic Crystal Fiber for Terahertz Wave Propagation

2018 ◽  
Vol 0 (0) ◽  
Author(s):  
Izaddeen Kabir Yakasai ◽  
Atta Rahman ◽  
Pg Emeroylariffion Abas ◽  
Feroza Begum
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Bulk Material ◽  
Single Mode ◽  
Confinement Loss ◽  
Design Parameters ◽  
Terahertz Waves ◽  
Material Loss ◽  
Crystal Fiber ◽  
Porous Core

AbstractA porous core photonic crystal fiber (PCF) for transmitting terahertz waves is reported and characterized using finite element method. It is shown that by enveloping an octagonal core consisting of only circular air holes in a hexagonal cladding, it is possible to attain low effective material loss that is 73.8% lower than the bulk material absorption loss at 1.0 THz operating frequency. Moreover, a low confinement loss of 7.53×10–5 cm−1 and dispersion profile of 1.0823±0.06 ps/THz/cm within 0.7–1 THz are obtained using carefully selected geometrical design parameters. Other guiding properties such as single-mode operation, bending loss, and effective area are also investigated. The structural design of this porous core PCF is comparatively simple since it contains noncomplex lattices and circular shaped air holes; and therefore, may be implemented using existing fabrication techniques. Due to its auspicious guiding properties, the proposed fiber may be used in single mode terahertz imaging and other short distance terahertz applications.

Relationship Between the Van Kleeck and Mass-Balance Calculation of Volatile Solids Loss

2003 ◽  
Vol 75 (4) ◽  
pp. 377-380 ◽  
Author(s):  
Michael S. Switzenbaum ◽  
Joseph B. Farrell ◽  
Albert B. Pincince
Keyword(s):  
Mass Balance ◽  
Mass Balance Calculation ◽  
Balance Calculation ◽  
Volatile Solids

Arsenic Originating in Kusatsu Hot Springs, Gunma, Japan, and Arsenic Pollution Status of Kusatsu Rivers

2008 ◽  
Vol 3 (4) ◽  
pp. 261-269 ◽  
Author(s):  
Yoshikazu Kikawada ◽  
◽  
Satoshi Kawai ◽  
Kazuhiko Shimada ◽  
Takao Oi ◽  
...  
Keyword(s):  
Mass Balance ◽  
River Water ◽  
Hot Springs ◽  
Hot Spring ◽  
Arsenic Concentration ◽  
Arsenic Pollution ◽  
Dam Reservoir ◽  
Mass Balance Calculation ◽  
Balance Calculation ◽  
Lime Water

Kusatsu hot springs at the eastern foot of the Kusatsu-Shirane volcano is a famous spa area in Japan. Its hot springs are strongly acidic making local rivers acidic, requiring lime water neutralization. We determined the arsenic concentration in hot springs, rivers, and neutralization products, to calculate the mass balance of arsenic in river systems. Hot springs supply a total of 45 tons a year in arsenic to local rivers, which transport some 28 tons a year — most of which is accounted for by Bandaiko hot spring and the Yu River. After neutralization, these flow into the Shinaki Dam reservoir, which accumulates large amounts of suspended neutralization products. Mass balance calculation suggests that arsenic dissolved in river water is nearly completely coprecipitated with or adsorbed by neutralization products, so that Shinaki Dam reservoir accumulates some 25 tons of arsenic yearly.

scholarly journals Comparative14C and OSL dating of loess-paleosol sequences to evaluate post-depositional contamination ofn-alkane biomarkers

2017 ◽  
Vol 87 (1) ◽  
pp. 180-189 ◽  
Author(s):  
Michael Zech ◽  
Sebastian Kreutzer ◽  
Roland Zech ◽  
Tomasz Goslar ◽  
Sascha Meszner ◽  
...  
Keyword(s):  
Organic Matter ◽  
Mass Balance ◽  
Radiocarbon Dating ◽  
Optically Stimulated Luminescence ◽  
Lipid Biomarkers ◽  
Osl Dating ◽  
Mass Balance Calculation ◽  
Climate Signal ◽  
Isotope Mass Balance ◽  
Late Weichselian

AbstractThere is an ongoing controversial discussion as to whethern-alkane lipid biomarkers—and organic matter of loess in general—reflect a synsedimentary paleoenvironmental/climate signal or whether they are significantly affected by postdepositional “contamination,” for example related to root and rhizomicrobial activity. In order to address this issue at our study site (the Middle to Late Weichselian loess-paleosol sequence Gleina in Saxony, Germany), we determined and compared radiocarbon ages of bulkn-alkanes and sedimentation ages, as assessed by optically stimulated luminescence (OSL) dating. The bulkn-alkanes of the four dated samples yielded calibrated14C ages ranging from 24.1 to 49.7 cal ka BP (95.4% probability ranges). While the three uppermostn-alkane samples are well within the range or even slightly older than the OSL-inferred sedimentation ages, the lowermostn-alkane sample is slightly younger than the OSL ages. There is hence little or no evidence at our study site forn-alkanes in loess-paleosol sequences being significantly “contaminated” by deep subsoil rooting or microbial processes. We propose a14C isotope mass balance calculation for estimating such contaminations quantitatively. Radiocarbon dating of bulkn-alkanes might have great potential for Quaternary research, and we encourage further comparative14C and OSL studies.

Distribution, long-term development and mass balance calculation of total alkalinity in the Baltic Sea

2008 ◽  
Vol 28 (4-5) ◽  
pp. 593-601 ◽  
Author(s):  
Sofia Hjalmarsson ◽  
Karin Wesslander ◽  
Leif G. Anderson ◽  
Anders Omstedt ◽  
Matti Perttilä ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Mass Balance ◽  
Total Alkalinity ◽  
The Baltic Sea ◽  
Mass Balance Calculation ◽  
Balance Calculation ◽  
The Baltic
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