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The technology enables much greater resource recovery in thick seams. A further 75%~80% of the additional coal in the seam can be accessed and recovered, significantly improving the total recovery. Above Pic ture, A typical mining planning of longwall top coal caving method. Coal Seam Thickness 4.5-7 Meters; Phase 3rd 6.5-7 Meters.
Feb 19, 2014· LTCC • Longwall Top coal Caving (LTCC) is a method of extraction for underground mining of thick seams. • It uses a longwall set-up and natural forces to aid in the winning of coal. 4.
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 ...
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 .
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) 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 ...
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.
•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 .
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.
developed mature in technology and employed in production for thick-seam deposits. These methods include: Multi-Slice Longwall, High Reach Longwall (single slice) and Longwall Top Coal Caving (LTCC). LTCC can mine out a seam varying from 4 to 20m in a single pass, requiring insignificant change to the face equipment.
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 ...
The technology enables much greater resource recovery in thick seams. A further 75%~80% of the additional coal in the seam can be accessed and recovered, significantly improving the total recovery Above Pic,A typical mining planning of longwall top coal caving method Coal Seam Thickness 4.5-7 Meters; Phase3rd 6.5-7 Meters.
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 ...
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
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.
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 ...
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.
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 ...
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 ...
LONGWALL TOP COAL CAVING DESCRIPTION Longwall Top Coal Caving (LTCC) is an enhanced form of the conventional longwall recovery system, whereby a rear Armoured Face Conveyor (AFC) (refer to Figure 3) is utilised to extract coal from behind the powered supports that would otherwise be left unrecovered in thick seam environments. The major
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 .
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 [.]
The Longwall Top Coal Caving (LTCC) has been the preferred underground mining method that has been developed and then accepted by its guaranteed results in China's coal mining industry. In this research paper, a 12 meter thick coal seam has been modeled successfully and the mechanism of top coal demonstrated and top coal recovery ratio was ...
Nov 01, 2017· Longwall Top Coal Caving has been considered as one of the most effective technologies for the extraction of underground thick coal seams. A large number of studies on the applicability of Longwall Top Coal Caving into new mine sites have linked the success of its application to the geomechanical understanding of the cavability of the top coal.
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