scholarly journals The Rationale for the Use of Modified Bitumen Coated Overburden Rocks for Haul Roads of Coal Mines

2019 ◽  
Vol 105 ◽  
pp. 01018
Author(s):  
Sergey Ivanov ◽  
Nikita Martel
Keyword(s):  
Chemical Composition ◽  
Production Rate ◽  
Coal Mining ◽  
Coal Mine ◽  
Crumb Rubber ◽  
Rubber Crumb ◽  
Modified Bitumen ◽  
Secondary Material ◽  
Adhesion Ability ◽  
Physical And Chemical

Kuzbass is a leader in the field of mining of coal as one of the main materials for industry and civilian use. Its production rate its is constantly increasing, which can not but affect the problem of using secondary material (in particular, rocks that are not used in further construction) that is produced during coal mining. Overburden rocks are often stored in dumps or they are used for filling coal mine roads, although this is the problem. In terms of their physical and chemical composition, the overburden rocks are of low strength, so there is a problem of strengthening this type of material, the solution of which can be found in the processing of rocks used for further construction with modified bitumen. The analysis of the effect of the adhesion ability of construction bitumen and crumb rubber modified bitumen produced according to the technology of stage addition of rubber crumb to bitumen (bitumen modified with crumb rubber by stages) is described in the article. Examples of the adhesion of construction bitumen and bitumen modified with crumb rubber by stages to various rocks are given. The characteristics of the adhesion ability of bitumen modified with crumb rubber by stages are substantiated.

scholarly journals An Evaluation on the Physical and Chemical Composition of Coal Combustion Ash and Its Co-Placement with Coal-Mine Waste Rock

2012 ◽  
Vol 03 (07) ◽  
pp. 589-596 ◽  
Author(s):  
Ginting J. Kusuma ◽  
Hideki Shimada ◽  
Takashi Sasaoka ◽  
Kikuo Matsui ◽  
Candra Nugraha ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Coal Mine ◽  
Coal Combustion ◽  
Mine Waste ◽  
Waste Rock ◽  
Coal Mine Waste ◽  
Mine Waste Rock ◽  
Physical And Chemical

STUDY OF CORIANDER SEED OIL (Coriandrum sativum L.)

2010 ◽  
Vol 13 (3) ◽  
pp. 29-38
Author(s):  
Ha Bich Phan ◽  
Thach Ngoc Le
Keyword(s):  
Biological Activity ◽  
Chemical Composition ◽  
Essential Oil ◽  
Seed Oil ◽  
Coriandrum Sativum ◽  
Conventional Heating ◽  
Geranyl Acetate ◽  
Physical And Chemical ◽  
Coriander Seed Oil ◽  
Coriander Seed

Coriandrum sativum L. belongs to the Apiaceae family, which is cultivated in Dong Nai province, in this paper its seed oil of was studied. The essential oil was extracted by hydrodistillation. We used two methods for activating of hydrodistillation: conventional heating and microwave irradiating. Its physical and chemical indexes were measured. The chemical composition of this oil was identified by GC/MS and quantified by GC/FID. Linalool (75.51-77.21 %), and geranyl acetate (15.64-12.79 %) were the main constituents of the oil which were obtained in 0,32-0.39 % yield. The biological activity of this oil was reported.

BACTERIA CONTENT, PHYSICAL AND CHEMICAL COMPOSITION OF BROILER MEAT GROWN ON THE HEATED FLOOR

2018 ◽  
Vol 20 (6) ◽  
pp. 24-25
Author(s):  
E.O. Kachanova ◽  
◽  
E.V. Pavlova ◽  
D.S. Derina ◽  
◽  
...  
Keyword(s):  
Chemical Composition ◽  
Broiler Meat ◽  
Heated Floor ◽  
Physical And Chemical

scholarly journals Directional Hydraulic Fracturing (DHF) of the Roof, as an Element of Rock Burst Prevention in the Light of Underground Observations and Numerical Modelling

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 562
Author(s):  
Marek Jendryś ◽  
Andrzej Hadam ◽  
Mateusz Ćwiękała
Keyword(s):  
Rock Mass ◽  
Hydraulic Fracturing ◽  
Coal Mining ◽  
Rock Burst ◽  
Coal Mine ◽  
Seismic Activity ◽  
Black Coal ◽  
Directional Hydraulic Fracturing ◽  
Before And After ◽  
The Face

The following article analyzes the effectiveness of directional hydraulic fracturing (DHF) as a method of rock burst prevention, used in black coal mining with a longwall system. In order to define changes in seismic activity due to DHF at the “Rydułtowy” Black Coal Mine (Upper Silesia, Poland), observations were made regarding the seismic activity of the rock mass during coal mining with a longwall system using roof layers collapse. The seismic activity was recorded in the area of the longwall itself, where, on a part of the runway, the rock mass was expanded before the face of the wall by interrupting the continuity of the rock layers using DHF. The following article presents measurements in the form of the number and the shock energy in the area of the observed longwall, which took place before and after the use of DHF. The second part of the article unveils the results of numerical modeling using the discrete element method, allowing to track the formation of goafs for the variant that does not take DHF into consideration, as well as with modeled fractures tracing DHF carried out in accordance with the technology used at “Rydułtowy” coal mine.

scholarly journals Investigation of the Formation Mechanism and Environmental Risk of Tire—Pavement Wearing Waste (TPWW)

2021 ◽  
Vol 13 (15) ◽  
pp. 8172
Author(s):  
Kechen Wang ◽  
Xiangyu Chu ◽  
Jiao Lin ◽  
Qilin Yang ◽  
Zepeng Fan ◽  
...  
Keyword(s):  
Formation Mechanism ◽  
Organic Contaminants ◽  
Asphalt Mixture ◽  
Fine Fraction ◽  
Crumb Rubber ◽  
Environmental Benefit ◽  
The Road ◽  
Open Graded Friction Course ◽  
Volatile Alkanes ◽  
Physical And Chemical

Tire—pavement interaction behaviours result in large amounts of wearing waste matter, which attaches to the surface of the pavement and is directly exposed to the surrounding environment. This kind of matter imposes a great challenge to the environment of the road area. The current study is devoted to carrying out a comprehensive investigation of the formation mechanism of tire—pavement wearing waste (TPWW), as well as the resulting environmental risks. A self-developed piece of accelerated polishing equipment, the Harbin advanced polishing machine (HAPM), was employed to simulate the wearing process between vehicle tires and pavement surfaces, and the TPWW was collected to conduct morphological, physical, and chemical characterisations. The results from this study show that the production rate of TPWW decreases with the increase in polishing duration, and the coarse particles (diameters greater than 0.425 mm) account for most of the TPWW obtained. The fine fraction (diameter smaller than 0.425 mm) of the TPWW comprises variously sized and irregularly shaped rubber particles from the tire, as well as uniformly sized and angular fine aggregates. The environmental analysis results show that volatile alkanes (C9–C16) are the major organic contaminants in TPWW. The Open-Graded Friction Course (OGFC) asphalt mixture containing crumb rubber as a modifier showed the highest risk of heavy metal pollution, and special concern must be given to tire materials for the purpose of improving the environmental conditions of road areas. The use of polyurethane as a binder material in the production of pavement mixtures has an environmental benefit in terms of pollution from both organic contaminants and heavy metals.

Research on Ethanol Production by Biological Fermentation of Potato Pulp

2013 ◽  
Vol 805-806 ◽  
pp. 281-285
Author(s):  
Zhong Xu
Keyword(s):  
Chemical Composition ◽  
Ethanol Production ◽  
Production Rate ◽  
Liquid Ratio ◽  
Fermentation Time ◽  
Potato Pulp ◽  
Fermentation Temperature ◽  
Ethanol Production Rate ◽  
Solid Liquid

Bioconversion of potato pulp to fuel ethanol, analysing the potato pulp chemical composition and determining the potato pulp in the role of microorganism produce ethanol under the best conditions is the major research. An analysis of the chemical composition of potato pulp showed that : the basic ingredients are Protein (9.72%), Starch (25.52%), Cellulose (17.90%). The effects of ethanol production rate of solid-liquid ratio, fermentation temperature, inoculumconcertration, fermentation time. The results showed that: the best conditions producting ethanol from potato pulp obtained by single factor experiments are: solid-liquid ratio: 1:15, fermentation temperature: 35°C, inoculumconcertration: 3mL, fermentation time: 20h. Under this occasion, the ethanol production rate was 0.183mL·g-1.

Impacts of Coal Mining on the Aboveground Vegetation and Soil Quality: A Case Study of Qinxin Coal Mine in Shanxi Province, China

2011 ◽  
Vol 39 (3) ◽  
pp. 219-225 ◽  
Author(s):  
Guo Donggan ◽  
Bai Zhongke ◽  
Shangguan Tieliang ◽  
Shao Hongbo ◽  
Qiu Wen
Keyword(s):  
Coal Mining ◽  
Soil Quality ◽  
Coal Mine ◽  
Shanxi Province
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