Flow of a Granulated Mineral Material During Firing in a Rotating Furnace

2005 ◽  
Vol 62 (1-2) ◽  
pp. 61-63
Author(s):  
A. N. Emel’yanov
Keyword(s):  
Mineral Material ◽  
Rotating Furnace

Direct Reduction of Ferrous Oxides to form an Iron-Rich Alternative Charge Material

2015 ◽  
Vol 34 (8) ◽  
Author(s):  
H. İbrahim Ünal ◽  
Enes Turgut ◽  
Ş. H. Atapek ◽  
Attila Alkan
Keyword(s):  
Hot Rolling ◽  
Direct Reduction ◽  
Charge Material ◽  
Sponge Iron ◽  
Reduction Degree ◽  
Solid Carbon ◽  
Second Stage ◽  
Hematite Ore ◽  
Reduction Of Oxides ◽  
Rotating Furnace

AbstractIn this study, production of sponge iron by direct reduction of oxides and the effect of reductant on metallization were investigated. In the first stage of the study, scale formed during hot rolling of slabs was reduced in a rotating furnace using solid and gas reductants. Coal was used as solid reductant and hydrogen released from the combustion reaction of LNG was used as the gas one. The sponge iron produced by direct reduction was melted and solidified. In the second stage, Hematite ore in the form of pellets was reduced using solid carbon in a furnace heated up to 1,100°C for 60 and 120 minutes. Reduction degree of process was evaluated as a function of time and the ratio of C

Improvement of Quality and Efficiency in Mineral Material Processing under Extreme Dynamic Environments

2012 ◽  
Vol 189 ◽  
pp. 355-358
Author(s):  
Wen Li Lian ◽  
Bo Xiang ◽  
Ping Zhou
Keyword(s):  
Material Processing ◽  
Dynamic Systems ◽  
Production Quality ◽  
Decoupling Control ◽  
Operation Performance ◽  
Mineral Material ◽  
Control Scheme ◽  
Process Simulations ◽  
High Interaction ◽  
Grinding System

In mineral processing the high material volumes yield the fact that benefits of even small improvements in the production quality and product efficiency are remarkable. During the operation of the mineral material processing, the grinding circuit (GC) is the key unit and its product particle size and circulating load are two controlled indexes directly related to the quality and efficiency of the whole mineral material processing. Therefore, an appropriate control of GC is especially significant to improve the operation performance of the mineral material processing. Due to the GCs are essentially multivariable dynamic systems with high interaction among process variables. It is hard to improve the quality and efficiency in the mineral material processing by controlling the grinding system with the conventional methods. In this paper, a novel multivariable decoupling control scheme is adopted to handle such intricate process. Simulations have shown the proposed method can greatly improve the production quality and product efficiency of the mineral material processing.

scholarly journals Dead Reefs Keep Calcifying but Only by Day

Eos ◽  
2019 ◽  
Vol 100 ◽  
Author(s):  
Jerimiah Oetting
Keyword(s):  
Measurement Technique ◽  
Dual Role ◽  
New Mineral ◽  
Turf Algae ◽  
Mineral Material

A new measurement technique has revealed that turf algae communities colonizing dead reefs have a dual role, adding new mineral material to the reefs during the day and taking it away at night.

Solving Environmental Problems by Recycling the Cut Chalk To Lime in a Rotating Furnace

2021 ◽  
Vol 25 (2) ◽  
pp. 48-53
Author(s):  
B.P. Yur’ev ◽  
V.A. Dudko
Keyword(s):  
Specific Heat ◽  
Fuel Consumption ◽  
Rotary Kiln ◽  
Thermodynamic Calculation ◽  
Environmental Problems ◽  
High Quality ◽  
Heat Of Decomposition ◽  
Rotating Furnace ◽  
Optimal Fuel Consumption

A technology of processing chalk from the Lebedinskoye deposit into high quality lime by roasting in a rotary kiln is proposed. A procedure has been developed for the thermodynamic calculation of the specific heat of decomposition of carbonates contained in chalk. The material and heat balances of the operating rotary kiln have been compiled. All the main parameters of its operation and the optimal fuel consumption for chalk processing have been determined.

scholarly journals Transformation of Lake Ecosystem into Peat Bog and Vegetation History Based on Durne Bagno Mire (Lublin Polesie, E Poland)

2007 ◽  
Vol 29 (-1) ◽  
pp. 23-43 ◽  
Author(s):  
Krystyna Bałaga
Keyword(s):  
Vegetation History ◽  
Chemical Elements ◽  
Late Glacial ◽  
Unique Element ◽  
Peat Bogs ◽  
Lake Ecosystem ◽  
Peat Bog ◽  
Mineral Material ◽  
Late Glacial And Holocene ◽  
Almost All

Transformation of Lake Ecosystem into Peat Bog and Vegetation History Based on Durne Bagno Mire (Lublin Polesie, E Poland)In this paper, the history of Durne Bagno, i.e. the largest peat bog in the Lublin Polesie, is shown. Peat bogs are a unique element of the Polesie landscape. They occur mostly in the subregion of the Łęczna-Włodawa Lake District occupying 1.07% of its area. They fill basin-shaped depressions without outflow, often in the immediate vicinity of dystrophic lakes. Based on interdisciplinary research, the changes of vegetation cover and the Durne Bagno lake-mire ecosystem in the Late Glacial and Holocene are presented. The environmental conditions are reconstructed from pollen analysis, detailed identification of algae ofPediastrumgenus and chemical composition of deposits, together with the results of Cladocera analysis. The distribution of archaeological artefacts in the surroundings of Durne Bagno peat bog gives the view on the intensity of settlement in this area. The duration of the limnic and mire stages during the development of the ecosystem was different in different parts of the examined depression. In its central part the limnic stage lasted about 8000 years and included the period from the Late Glacial to the middle Holocene (to about 6000 BP). It is represented by 7 pollen zones and 6 chemical zones. The mire stage contained a part the Atlantic period and on the Subboreal and Subatlantic periods. It is represented by 4 pollen zones and 5 chemical zones. Limnic and mire deposits differ widely in the concentrations of chemical elements. The contents of mineral material and almost all analyzed elements in limnic deposits are high. These deposits are characterized by positive correlation between the contents of Zn and Cr and the frequency of Cladocera fauna. Peat contains very low amount of mineral material. The contents of Ca, Sr and Ba are rather high in sedgemoss peat. The concentrations of these elements decrease upwards due to oligotrophic processes and sedentation of sedge-Eriophorum-Sphagnumpeat. Peat succession was modified by pastoral economy of prehistoric man.

scholarly journals Modern technologies of a mineral material surface improvement for transport construction

2018 ◽  
Vol 239 ◽  
pp. 01006
Author(s):  
Larisa Svatovskaya ◽  
Vladislav Britov ◽  
Ivan Drobychev
Keyword(s):  
Concrete Surface ◽  
Experimental Methods ◽  
Silica Sol ◽  
Material Surface ◽  
Mineral Surface ◽  
Foam Concrete ◽  
Aggressive Environment ◽  
Mineral Material ◽  
Modern Technologies ◽  
Surface Improvement

The paper deals with technologies of a mineral material surface improvement for transport construction. Mineral surface is important because of its hardness, durability and other properties. Besides, it is necessary to protect it from aggressive environment. The purpose of the article is to introduce a few techniques of silica sol use in order to change mineral surface properties. The absorption, irrigation and watering processes were applied as the techniques. Both silica sol and its mixes with solutions contained Ca(II) ions were used as the substances. The experimental methods were carried out during the study. The experiment results have shown that hardness of the mineral material and foam concrete surface was increased up to 60% and the level of the soil strengthening was more than 0,5 MPa. It means that if silica sol and solutions containing Ca(II) ions are used a soil strength is increased more than 40-50%. The results of the study are particularly useful for construction of motorways in order to extend their service life.

In situ remediation of Cd(II) contaminated paddy fields with activated Ca Si mineral material derived from Potash feldspar and its mechanism

2020 ◽  
Vol 158 ◽  
pp. 106052
Author(s):  
Meiqing Zeng ◽  
Xiaohui Zhou ◽  
Jing Guo ◽  
Kaiyu Liu ◽  
Chubin Zhong ◽  
...  
Keyword(s):  
Paddy Fields ◽  
In Situ Remediation ◽  
Potash Feldspar ◽  
Mineral Material

QUALIDADE DE GRÃOS DE MILHO SUBMETIDOS À SECAGEM COM LENHA E POSTERIORMENTE ARMAZENADOS EM AMBIENTE NATURAL

2016 ◽  
Vol 15 (3) ◽  
pp. 594
Author(s):  
RAFAEL FRIEDRICH DE LIMA ◽  
ARNALDO TIECKER JUNIOR ◽  
PAULO RICARDO DE JESUS RIZZOTO JÚNIOR ◽  
RAFAEL GOMES DIONELLO ◽  
LAURI LOURENÇO RADUNZ
Keyword(s):  
Zea Mays ◽  
High Temperatures ◽  
Storage Time ◽  
Storage Period ◽  
Kernel Weight ◽  
Weight Density ◽  
Mineral Material ◽  
Randomized Design ◽  
Latent Effects ◽  
Technological Quality

RESUMO - Com a finalidade de avaliar os efeitos imediatos e latentes da secagem com altas temperaturas, usando lenha como combustível, nas qualidades física, química e tecnológica de grãos de milho, foram utilizadas três temperaturas do ar de secagem: 60 ºC, 60/80 ºC e 80 ºC. As análises realizadas foram de: peso de 1.000 grãos, massa específica, umidade, análises químicas de proteína bruta, acidez titulável, material mineral e análise de defeitos nos grãos. O estudo foi conduzido conforme o delineamento inteiramente casualizado, em esquema fatorial, sendo os dados submetidos à análise de variância e, posteriormente, ao teste de Tukey e à análise de regressão. Com base nos resultados obtidos, concluiu-se que: 1. A massa específica dos grãos de milho apresentou redução de forma direta com os incrementos da temperatura de secagem e do tempo de armazenagem; 2. As reduções do peso de 1.000 grãos e do incremento de avariados ocorreram em função do tempo de armazenamento; 3. O percentual de grãos carunchados foi menor nas maiores temperaturas de secagem, porém com incremento ao longo do período de armazenagem, exceto para a secagem a 80 ºC; 4. Ao longo do tempo de armazenagem, foram observados incrementos na acidez do óleo e na material mineral, com maiores valores, ao final da armazenagem, naqueles grãos submetidos a maior temperatura do ar de secagem.Palavras-chave: Zea mays; secagem com altas temperaturas; efeitos latente e imediato.QUALITY OF MAIZE GRAINS SUBMITTED TO FIREWOOD DRYING AND STORED UNDER NATURAL ENVIRONMENTABTRACT - In order to assess the immediate and latent effects of drying at high temperatures (using wood as fuel) on the physical, chemical and technological quality of maize grains, three temperatures were used for drying: 60°C, 60/80 º C and 80ºC.: Grain weight, density, moisture, chemical analysis of crude protein, acidity, mineral material, and defects in grains were evaluated. The study used a completely randomized design in a factorial scheme, and the data were submitted to analysis of variance. Tukey test and regression analysis were subsequently performed. The results showed that: 1. The specific mass of the corn grains decreased directly with increasing drying temperature and storage time; 2. Reduction in the thousand kernel weight and increase in damaged grains occurred with increasing storage time; 3. The percentage of rotten grains was lower in higher drying temperatures, but was higher as the storage period increased, except for drying at 80°C; 4. During the storage period, increases in acidity of the oil and mineral material were observed, with higher values at the end of storage period for those grains subjected to higher drying temperature.Keywords: Zea mays; drying at high temperatures; latent and immediate effect.

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