Australian Rail Track Corporation LTD 2005 define a railway ballast as; free draining coarse aggregate or metallurgical slag used to support railway tracks. It is recommended that ballast should be “hard durable and as far as possible angular along edges/corners, free from weathered portions of parent rock, organic impurities and inorganic residues” (Reference) Rocks which contain minerals which are deemed harmful to the longevity and behaviour of the ballasts may be rejected following petrographic or durability testing.
Shape and size
It is recommended that ballast material be as cubical in shape as possible, and that percentage of retained irregular grans not exceed 30% when ballast material is tested using the 9.50mm test sieve.
Sieve size (mm) % passing by mass
63 100
53 85-100
37.5 20-65
26.5 0-20
19 0-5
13.2 0-2
9.5 -
4.75 0-1
1.18 -
0.075 0-1
Particle size distribution (Australian Rail Track Corporation LTD 2005)
Properties
The proportion of flaky particles in the ballast material retained on the 6.70mm test sieve shall not exceed 30%
The percentage of weak particles when tested shall not exceed 5%
The wet attrition value …show more content…
Zenith is one of the largest mining and crushing equipment manufacturers in the world. It is recommended that processing infrastructure be sourced from Zenith if it economically viable. A crusher will be essential in processing the material. There are many different types of crushers available, such as; cone crusher, jaw crusher, grinding mill, ball mill and mobile crusher. It is recommended that the most economically viable crusher be assessed to determine the most appropriate processing facility for the life of the mine. Vibrating screens, conveyors and wash tables are also essential processing infrastructure which will need to be sourced and set up in a economically viable
Shape and size
It is recommended that ballast material be as cubical in shape as possible, and that percentage of retained irregular grans not exceed 30% when ballast material is tested using the 9.50mm test sieve.
Sieve size (mm) % passing by mass
63 100
53 85-100
37.5 20-65
26.5 0-20
19 0-5
13.2 0-2
9.5 -
4.75 0-1
1.18 -
0.075 0-1
Particle size distribution (Australian Rail Track Corporation LTD 2005)
Properties
The proportion of flaky particles in the ballast material retained on the 6.70mm test sieve shall not exceed 30%
The percentage of weak particles when tested shall not exceed 5%
The wet attrition value …show more content…
Zenith is one of the largest mining and crushing equipment manufacturers in the world. It is recommended that processing infrastructure be sourced from Zenith if it economically viable. A crusher will be essential in processing the material. There are many different types of crushers available, such as; cone crusher, jaw crusher, grinding mill, ball mill and mobile crusher. It is recommended that the most economically viable crusher be assessed to determine the most appropriate processing facility for the life of the mine. Vibrating screens, conveyors and wash tables are also essential processing infrastructure which will need to be sourced and set up in a economically viable