Development and extraction of coal pillar by continuous

miner technologySUBMITTED BY-

SHUBHAM AGARWAL

B. Tech in mining engineering

ISM Dhanbad

1

OBJECTIVE:-

1.Development of coal pillars by continuous miner technology

2.Extraction of coal pillars by continuous miner technology

2

Coal mining –

The goal of coal mining is to economically remove coal from the ground. Coal is valued for its energy content, and since the 1880s is widely used to generate electricity.

3

Pillar- A block of coal left behind in a coal seam to aid support

of the overlying strata. Pillars may be needed to prevent

excessive subsidence on the ground surface or to avoid

excessive geological distortions in the mine workings. For

example - a pillar is usually left between two panels of coal being extracted by longwall mining.

4

DEFINITIONS:

Pillar boss: In bituminous coal mining, a person who supervises the work of robbers in removing pillars of coal that were left to support the roof of working places during mining operations.Pillar robber: In anthracite and bituminous coal mining, one who breaks down and rips out with a pick, pillars of coal left to support the roof in rooms when the usual mining was being done.Pillar man: A person who builds stone packs in mine workings.

5

ROOM AND PILLAR MINING-

This drawing depicts the room and pillar method of underground mining. Most underground coal is mined by the room and pillar method, whereby rooms are cut into the coal bed leaving a series of pillars, or columns of coal, to help support the mine roof and control the flow of air.

6

DEVELOPMENT OF PILLARS-

Room and pillar mining is defined by the fact that portions of the coal seam being extracted are left in place to support the roof of the mine. Room and pillar mines are developed by using machinery to extract the coal seam in a grid like pattern through the development of a parallel series of extraction areas referred to as entries.

7

Types of pillar mining-

1. conventional mining

2. continuous mining

8

Conventional mining-

Conventional mining is the oldest method. In conventional mining, the coal seam is cut, drilled, blasted and then loaded into cars.

9

Continuous mining –

Continuous mining is the most prevalent form of underground mining. In continuous mining, a machine known as a continuous miner cuts the coal from the mining face, obviating the need for drilling and blasting.

10

Continuous miner-

A machine with a large rotating steel drum equipped with tungsten carbide teeth that scrape coal from the seam.

The JOY continuous miner product line has been developed to meet the high productivity requirements of today's underground mining industry.

11

CONTINUOUS MINER

12

Types available in the market–

The continuous miner product range is segmented by mining height requirements into three machine classes for low, medium and high-seam applications.14CM Series Continuous Miners12CM Series Continuous Miners12HM Series Continuous Miners

13

Main parts of a Continuous Miner-

• CUTTER

• GATHERING HEAD

• CONVEYOR

• TRACTION

• DUST COLLECTOR

• MANIFOLD HYDRAULICS

• ELECTRICAL CIRCUITS

14

PILLAR EXTRACTION USING CONTINUOUS

MINERS

15

The continuous miner has a large rotating steel

drum equipped with tungsten carbide teeth that

cut coal from the seam.

These machines are designed to remove coal

from the seam and to load it into shuttle cars and

then conveyor belts in a continuous process.

This allows the coal to be rapidly removed from

the working area and transported to the surface.

16

Thank you

17