Blasting, process
of reducing a solid body, such as rock, to fragments by using an explosive
. Conventional blasting operations include (1) drilling holes, (2) placing a charge and detonator in each hole, (3) detonating the charge, and (4) clearing away the broken material.
How do you get into blasting?
To qualify for a Surface Mine Blaster or Underground Mine Blaster certificate, you must: (1) have at least
3 years of experience
in a related surface or underground mining environment, (2) submit a valid First Aid certificate, (3) submit written evidence that you have received adequate instruction and training under …
What is the process of blasting?
Blasting, process
of reducing a solid body, such as rock, to fragments by using an explosive
. Conventional blasting operations include (1) drilling holes, (2) placing a charge and detonator in each hole, (3) detonating the charge, and (4) clearing away the broken material.
What are the factors affecting blasting?
The major factors affecting the blast-casting results include:
bench height, burden, dip angle of blast holes, powder factor, delay time interval, presplitting blasting effect, blasting patterns, and so on
.
Why blasting method is required?
There is always a need to have effective free face for blasting. In essence blasting is done
to blast overburden, ore deposit and coal seams
so that the power requirement for excavators to extract the materials becomes less. It also reduces clearing time of materials and decreases operation costs.
What are the types of blasting?
- Sand Blasting. Image Source: ABITL Gallery. …
- Wet Blasting. Wet blasting was designed to solve the big problem with air blasting, which is controlling the amount of airborne dust that results from doing air blasting. …
- Vacuum Blasting. …
- Centrifugal Blasting. …
- Soda blasting. …
- Steel Grit blasting. …
- Bristle blasting. …
- Dry-ice blasting.
Why do you blast before painting?
Abrasive blasting uses various materials to strip imperfections, paint, rust and other
contaminants
from a surface. It’s an important step in surface coating preparation, as it cleans a substrate and creates a surface that will hold a protective coating.
How long is a blasting course?
Blasting Ticket is a full qualification that has to be implemented inform of a learnership and as you may probably know, it has to take you
12 months
.
How much does a blaster make?
A Explosives Worker, Ordnance Handling Expert, and Blaster can earn average salaries of
between $33,440 and $73,650
based on experience and domain knowledge. usually get a salary of fifty-one thousand and fourty dollars each year.
How much does a driller blaster make?
| Average Wage $63.62 / hr | Average Salary $124,524.00 / yr | Hours Per Week 39.3 hrs |
|---|
What is charge factor in blasting?
blast design, blasting, surface mining. 1 INTRODUCTION. The specific charge (powder factor) is
a measure of the mass of an explosive required
.
to break a unit volume or a unit mass of the rock
.
What is stemming in blasting?
Stemming is
a material that is put inside of a blast hole to help prevent gases from escaping
. While stemming is typically put in the top of a blast hole, it can also be used to help bridge mud seams or weak layers. Improperly placed stemming can greater decrease fragmentation size.
What are the precautions to be taken in the process of blasting?
- selecting the direction of the blasting face to place people and buildings behind the face.
- avoiding shallow blasts less than 1m in depth, and using high blast ratio and small hole diameters where possible.
- ensuring burden is one-third to one-half the depth of holes.
How drilling and blasting is done?
- Drilling blast holes and loading them with explosives.
- Detonating the blast, followed by ventilation to remove blast fumes.
- Removal of the blasted rock (mucking).
- Scaling crown and walls to remove loosened pieces of rock.
- Installing initial ground support.
Why grit blasting is done?
Abrasive grit blasting is widely used by a range of
industries to clean or modify the surface properties of materials
. Common applications include: Surface preparation ahead of coating or bonding operations. Removal of paint, rust, sand or scale from surfaces.
What is a blasting certificate?
This
certificate of competency
is issued to a competent person who can be appointed legally to perform duties of a miner or a blaster at a South African mine as stipulated in the Mine Health and Safety Act, 1996 (Act 29 of 1996) as amended and its regulations.
