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Longwall top coal caving (ltcc) is a relatively new method of mining thick coal seams that is currently achieving high productivity and efficiency in application, particularly in china. the technique is similar to traditional longwall mining in that a cutting head slices coal from the lower section of the coal seam onto a conveyor belt [.]
Steep coal seam mining activities will frequently occur during the next few decades in China. In this study, both experimental and numerical methods are employed to investigate the coal drawing from thick steep seam with longwall top coal caving mining. A series of analyses is performed to investigate the features of the drawing body, the distribution of top coal recovery ratio and the shape ...
Key Words: numerical modeling, Thar Coalfield, top coal caving, top coal recovery ratio, thick coal seams 1. Introduction Longwall Top Coal Caving (LTCC) is a technique that enhances the efficiency level of production at thick coal seams [1]. The LTCC was developed by combination of longwall and ...
Using standard longwall equipment, annual production can reach 3 million metric tons (Mt), and a maximum of 4.1 Mt has been obtained; many top-coal caving longwall working faces can obtain 200 tons per man-shift. Longwall top-coal caving is distinctly different from slice mining in thicken seam.
Jan 31, 2019· 1. Introduction. Thick coal seams (seam height larger than 3.5 m) have become increasingly important in China since such seams offer over 40% of the annual coal production (Wang & Zhong 2008; Wang 2009).Coal seams of 6–9 m are widely found in the northern and western coal bases of China (i.e. Shendong, Shanbei, Huanglong and Xinjiang) with abundant proven reserves and .
1 INTRODUCTION. Longwall mechanized top coal caving mining (LMTCCM) is the most universal method for the mining of extra‐thick coal seams in China. 1 A gob‐side entry (GSE) as walking, ventilation, and transportation passage is extremely important for the efficient production and safety of coal mines. 2 The coal pillar width directly affects the stability of the GSE. 3 The importance of ...
May 26, 2017· Longwall top coal caving (LTCC) is a special type of longwall mining applicable to very thick seams (greater than 4.5m) where good quality coal is being left because "conventional" longwall equipment has not yet been designed to operate successfully beyond around 5m mining height.
There is an urgent need for implementation of effective thick seam extraction technologies in Australia to improve resource recovery and productivity levels in underground coal mining. The Longwall Top Coal Caving (LTCC) method, which is being used successfully in China, offers a great potential for thick seam extraction in Australia.
It was producing 900 mtpd using standard sublevel caving techniques. Sublevel caving is a longwall mining method used widely in Europe to mine thick seams. As the face advances along the bottom of the seam, chutes located at the top of the shields open and the top coal.
reserves of the country belong to thick seams (seams thicker than 4.8 m) (Singh & Singh, 1999). 2. LONGWALL METHODS FOR THICK COAL SEAMS In Turkey, several methods are used to mine thick coal seams. Methods most commonly used can be classified as follows; -Single Pass Longwall (SPL) -Multi-Slice Longwall (MSL) -Longwall Top Coal Caving (LTCC) 2.1.
Jul 21, 2015· Thick and ultra-thick coal seams are main coal seams for high production rate and high efficiency in Chinese coal mines, which accounts for 44 % of the total minable coal reserve. A fully mechanized top-coal caving mining method is a main underground coal extraction method for ultra-thick coal seams. The coal extraction technologies for coal seams less than 14 m thick were .
The disadvantages of top coal caving are that the recovery rate of top coal at both ends of the face is very low and the coal left in the gob is the source for spontaneous combustion. Therefore, the ultra-thick whole seam one slice longwall mining was developed to increase the recovery rate and safety of ultra-thick coal seams in 2009.
Top Coal Caving Longwall Maximizes Thick Seam Recovery Austar's longwall system offers opportunities in seams thicker than 4.5 meters By Greg Duncan, Glenn Sobey and Tim Clarke A crew from Yancoal Australia's Austar mine visited a Chinese mine owned by Yancoal's
Deep Mining Mining of the lower orebody extends from the 1,050-m to the 1,410-m level, the latter being the main haulage level to the underground primary crushing station at 1,405 m, which is linked by conveyor to weigh silos that load the Timo shaft's 15.5-m/s skip hoist. (Matti Pulkkinen, mine engineer, commented that the supplier, ABB, uses the shaft installation as a showpiece for ...
A brief description of longwall top coal caving (LTCC) is included at the end of the Longwall section of the Fundamentals of Coal Mining module of this web site. Despite the fact that there are numerous coal seams in Australia which are thick enough for LTCC to be used to increase recoveries, potentially at a reduced cost/tonne, there has been ...
In this study, a 12 m thick coal seam with cutting to caving height ratios like 1:2 and 1:3 has been modelled, and the mechanism of longwall top coal caving demonstrated and front abutment ...
•The surface stepped subsidence had badly affected the public infrastructure safety.•The formation mechanism of the surface stepped subsidence case was explained.•The surface subsidence profile after the sequent mining activity was predicted.•The possible controls of .
Longwall Top Coal Caving Underground Coal. Longwall top coal caving a brief description of longwall top coal caving ltcc is included at the end of the longwall section of the fundamentals of coal mining module of this web site despite the fact that there are numerous coal seams in australia which are thick enough for ltcc to be used to increase recoveries
Nov 15, 2017· The overhead coal is allowed to cave with the roof. The second longwall face is then started off(6- 12months) later at the foot of the seam using the basic Top Coal Caving(TCC) method. 13. LONGWALL TOP COAL CAVING 14. LONGWALL TOP COAL CAVING ADVANTAGES • High coal recovery. • Operating cost reduction. • High productivity.
Longwall Top Coal Caving (LTCC) is a modified longwall mining method for efficient extraction of the thick coal seams. The major difference between LTCC and the traditional longwall method is the extraction of the caved coal from behind the shields as well as the sheared face ().The method has been widely implemented by the Chinese coal industry with numerous modifications and improvements.
Serious rib spalling and low recovery rate problems caused by the poor top-coal caving property (TCCP) were investigated in fully mechanized caving mining with large mining height (FMCMLMH) of extremely thick coal seam. For this aim, theoretical calculation, numerical simulation, and engineering application were applied to study the reasonable cutting-caving ratio under the influence of ...
Longwall top coal caving (LTCC) has been well studied and widely applied in mining thick coal seams to improve recovery efficiency [4, 5], partly because caved coal was extracted from the area ...
Yancoal introduced the Longwall Top Coal Caving (LTCC) mining technology to Australia at its Austar mine in 2006. Developed in China, top coal caving uses a modified long wall mining system. LTCC allows the excavation of thick coal seams of 5 to 12 metres at one pass of the longwall machine, generating high productivity and economic returns for ...
Longwall top coal caving (LTCC) is a special type of longwall mining applicable to very thick seams (greater than 4.5m) where good quality coal is being left because "conventional" longwall equipment has not yet been designed to operate successfully beyond around 5m mining height. It enables an increased recovery for only an incremental ...
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