Granite

Silica (SiO2)                                                             70-77%
Alumina (Al2O3)                                                      11- 14%
Soda (Na2O)                                                            3 – 5%
Potassium Oxide (P2O5)                                          3 – 5%
Iron (FeO)                                                                  1 – 3%
Iron (Fe2O3)                                                                1-2%
Lime                                                                            1%
Magnesia (Mg0)                                                          5 – 1%
Titina                                                                          Less than 1 %( .38%)
Water (H2O)                                                               0.03%

Co-efficient of expansion :
The co-efficient of expansion for granite vary from 4.7x10-6 – 9.0x10-6(inches x inches).

Porosity/permeability :
Granite has almost negligible porosity range among 0.2 to 4%.

Variegation :
Granite shows constancy in color and texture.

Thermal Stability :
Granite is highly steady thermally, therefore shows no change with the change in temperature. It is impervious to weather from temperature and even from the air borne chemicals. Granite is the high confrontation to chemical erosion that makes it useful for making tanks to store highly caustic material.

Hardness :
It is the hardest building stone and hardness of it that lends it excellent wear.

Granite deposits in Nigeria are found in  cross River, Imo, Ebonyi, FCT, Abia, Osun, Ekiti, Oyo, Ondo, Niger, Gombe, Bauchi, Yobe, Adamawa, Taraba, Borno, Edo, Katsina  and Kano

The working process starts at the diamond multiple –blade frame saw where the raw blocks are cut into plates.  The raw plates are subsequently cut into slabs by means of the circular sawing machine.  Trimming machine is used to cut the ends of the slabs.

Presently, polished granite/marble are just being introduced into the building industry in Nigeria.  With the development of Abuja, where most of the pioneer structures are already adorned with polished granite/marble stones, the demand for the product is expected to be very high.  Furthermore, it has been extensively used in the construction of corporate building headquarters, high class hotels and presidential/ministerial buildings in Abuja and other state capitals.  The project also has a very high export potential.

Rock aggregate is a very important raw material in building and construction industries. Recent market survey showed that procurement of quartz/gravel, which is also used in the construction industry, is given way for the crushed granite rock aggregate. There is a few meaningful granite crushing operations in the country. The main by-product of granite crushing is the stone dust, which is extensively used in place of sand in production of building blocks and concrete works

The ever increasing deficit in housing supply and the need for he construction of the other important infrastructure would ensure that granite aggregates {chipping} which is a major raw material in the construction industry to be in constant demand.

Granite chippings production in Nigeria is very critical to the success of the construction industry in any country owning to the vital role they play in the industry and same could be said of Nigeria. The production as evolved over the years from the use of crude implements which are still in use in some part of the country to the use of high tech machinery and equipment. Granite chipping production is not only the most active segment of the mining industry in Nigeria but

The Market for granite aggregates is both local and international though more focus would be laid on the local market because there is a deficit in supply of the product in the country.

The plant comprises of the hopper, vibrating feeder, jaw crusher, hydraulic, cone crusher, vibrating screen, magnetic separator, belt conveyor and the control panel.

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