Bauxite Ore Mining Process
Bauxite Ore is the mineral form of aluminum, and containing about 50 per cent alumina. Bauxite is normally found in a layer averaging three to five meters deep, located about half a meter beneath the topsoil. Mined bauxite resembles small red pebbles, called pisolites, averaging about five millimeters in diameter.Bauxite oreplays an important role in the Bauxite ore mining process.As a bauxite beneficiation plant manufacturer, we can also provide you with bauxite washing plant for sale,bauxite crusher,Bauxite crushing units for sale in india.
1. Tree Clearing
Timber clearing is carried out two to five years prior to mining. This allows all the understorey plant species to propagate within the topsoil. It also helps the various bacteria in the topsoil to flourish creating a healthy and viable topsoil. The redistribution of the topsoil on mined areas is a key part of our rehabilitation process
The bauxite deposit is overlain by less than one metre of overburden and topsoil. The overburden and topsoil is returned directly to mined areas as part of the rehabilitation process. A twin engine scraper removes approximately 50 per cent of the overburden. The remaining overburden is removed by the truck and loader fleet.
As part of the rehabilitation program, seeds and plant species from the area to be mined are collected, with the assistance of local indigenous people, carefully catalogued and stored. The topsoil is re- laid over the prepared areas and area is ‘deep-ripped’ to promote drainage, aeration and root penetration. This step, which is the nucleus of the regeneration program, preserves the soil biota and encourages plant regeneration. The area is then planted and fertilised immediately before the commencement of the wet season.
The bauxite ore is mined using track bulldozers which rip the bauxite and push it into stockpiles. Front-end loaders then load the ore into trucks which transport the ore to the crusher. Prior to mining, grade control drilling is undertaken to establish the grade of ore in each area of the mine. The mined ore from various areas of the mine is blended to ensure the ore meets the specifications required in the refinery.
5. Crushing and Screening
The haul trucks dump the bauxite into a hopper at the crusher. It then passes through a primary crusher, screening plant and secondary crusher to produce material that is less than 25mm in size. The ore is held in 1700 tonne surge bins before being transported to the refinery on the 18.7 kilometre overland conveyor.
6. Bauxite Stockpiles
The crushed bauxite is stacked at the refinery on stockpiles. It is laid down on the stockpiles by a stacker that constantly passes up and down the stack being built to ensure a uniform grade of bauxite. There are four 100,000 tonne stockpiles and crushed bauxite is reclaimed from the stockpiles by either a barrel reclaimer or a bucket reclaimer.