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 also one in which high tech equipment is used the most.
Granite chipping are rock aggregates derived from the blasting of rock to derive different sizes of boulders and then the reduction of the boulders to the desired sizes in the primary and secondary crushers. They are basically used in the construction of roads, houses and bridges and other construction activities.
Though the subject matter of this article is on the production of granite chipping from rocks, it is important to state that are also produced from granite quarry. Dimension stones are used in the decoration of homes. The World Bank study of 2009 did confirm that about 800,000 square meters of dimensions stones were imported into the country on yearly basis and out the whole demand of the economy, the country can only produce less than 5% indicating a large untapped market for the product.
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.
In 2004, studied reveal that there was a net production of about 15 Million MT whereas demand was 16.2 Million MT indicating a deficit in supply of 1.2 Million MT and these confirms the fact that there is a ready market for the product in the country.
Just like every mining activities in Nigeria, quarry operation is regulated by the ministry of solid minerals and steel development. Details of the legal requirement would be provided to interested clients.
A summary of the production of granite chippings is given below
In order to reduce the parent rock into smaller sizes , roles is drilled into the rock and they are loaded with blasting materials ready for blasting.
After the blasting of the rock to derive different sizes of boulders, before the aggregates can be reduced to the desired size, they would have to be crushed twice.
First in the primary crusher which done at the Jaw Crusher and at the Cone Crusher for the secondary crushing. It is at the cone crusher that the machine is adjusted to produce the different grades of granite aggregates like dust, rice, stone base, mable stone, 7/8 inch , 3 ¼ inch and ½ inch.
The plant comprises of the hopper, vibrating feeder, jaw crusher, hydraulic, cone crusher, vibrating screen, magnetic separator, belt conveyor and the control panel
The different grades of granite aggregates and there ex-site price as at the time of writing is given below.
Dust N2000/MT Ex-Site
Rice N1900/MT Ex-Site
Stone Base N2100/MT Ex-Site
Mable Stone N2200/MT Ex-Site
7/8 inch N1950/MT Ex-Site
3 ¼ inch N2100/MT Ex-Site
½ inch N2100/MT Ex-Site
The 3 ¼ and ½ inch grades is the most sorted grades.
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