Earth’s most critical iron ore deposits are located in sedimentary rocks. They formed from chemical reactions that combined iron and oxygen in marine and fresh waters. Two of the most important minerals during these deposits are iron oxides: hematite ore and magnetite ore. These iron ores happen to be mined to create almost every iron and steel object that people use today – from paper clips to automobiles towards the steel beams in skyscrapers.
Iron ore mining Process
Mining is completed by top rated slicing technique. OB and Ore are eliminated mechanically using the support of excavator and dumper. Common heights from the benches are taken care of according to the laws and permissions granted from the Director of Mines Security, Chaibasa area. The ROM is fed to your crusher to acquire the last item of five – twenty mm crushed ore.
Haul roads are taken care of appropriately, considering width and gradient. Sturdy parapet walls all along the haul street happen to be furnished & taken care of.
Drilling operation is completed at the mines with all the aid . A water injection system has been supplied in the wagon drill for wet drilling to suppress the fugitive dust. Rock breaker continues to be offered to break the oversize boulders eliminating secondary blasting.
Sufficient water spraying arrangements have already been supplied to suppress dust on haul roads using the support of two Nos. 10 KL & 1 No. 12 KL capacity water tankers throughout the working shifts. Water sprinkling has also been furnished at all discharge points of OPP (Ore Processing Plant) along using the atomized sprinkling arrangement.
35 MT capability dumpers transfer the Range of motion through quarry to crusher via a well-maintained haul street. The haul street is one with the very best in the locality, for which we are accorded the best haul street prize during the Annual Mines Security Week Celebration every year.
First, Iron Ore Crushing
Centering mills in China generally use the three-stage crushing flow of hard break, medium break and fine broke to interrupt iron ore. Rough crusher as iron ore crusher is usually conducted by gyratory crusher of just one.2m or 1.5m, medium break uses 2.1m or 2.2m standardized cone crusher, and fine broke adopts 2.1m or 2.2m short head cone crusher. The block size with the ore undergone rough break is smaller than 1m, then after medium break and fine break, sifted to be ultimate products with granularity small compared to 12mm and sent to your ore grinding trough.
Second, Grinding Approach
The most adopted iron ore grinding method in China is the two-stage ore grinding flow. ,concentrating mills of medium-size and small-size usually adopt one-stage ore grinding flow. As a result of fine grinding and then a new screen technology, in recent years numerous concentrator continues to be replaced by two three-grinding grinding. Grinding equipment utilized in general relatively small, the largestthe largest rod mill 3.2m – 4.5m, the largest because the mill five.5m 1.8m, gravel mill 2.7m – 3.6m.
After grinding the classification is actually using spiral classifier. In order to improve efficiency, some hydro-cyclone concentrator to replace the 2nd spiral classifier.
Third, Iron ore Beneficiation Technology
1.Beneficiation Of Magnetite
Mainly used to select low-grade “Anshan-type” magnetite. Since this ore has powerful magnetism and is easy to grind and select, all magnetic splitting up plants in domestic adopt stage ore milling flow and multi-stage ore grinding flow. Take up the first kind (one-stage ore grinding) for coarse-grain embedded magnetite, and the latter (two-stage or three-stage ore grinding) for fine-graine and micro-grain embedded magnetite (Figure 3.2.23). Developed our own series of permanent magnets to ensure that magnetic separator with the realization of a magnet. 70 since, as with the nation to promote the fine magnetite concentrator mill screen and so the new technology, so concentrate grade from 62% to about 66% to achieve the Ministry of Metallurgical Industry 65% concentrate quality needs.
2.Weakly Magnetic Iron Ore Beneficiation
Mainly used to sorting hematite, limonite, pyrite mirrors, siderite, an incorrect impression or perhaps a combination of hematite ore, the so-called “Red Mine.” Such low-grade ore, cloth inlay fine particle size, mineral composition with the complexity of sorting difficulties. After the 80′s, processing technology for magnetic roasting, Wet High Intensity Magnetic Separation, weak magnetic flotation method and the re-election, etc., equipment and new varieties of pharmaceutical research still improve, so concentrate grade and metallic recovery rates rising. Such as the Anshan Iron and Steel Qidashan Concentrator utilizing weak magnetic – Magnetic – a brand new flotation method, was an encouraging achievement.
3.Polymetallic Total (With) Mine Health
Mineral composition of such complex and diverse, therefore the approach used, equipment and processes will vary, like the use of anti-Bayan Obo iron ore flotation – multi-gradient magnetic separation, flocculation flotation, weak magnetic – the anti-flotation – Magnetic election, the weak magnetic – are flotation, magnetic separation, for example roasting a different method in order to improve the recovery rate of iron and comprehensive recovery of rare earth oxides. Panzhihua Iron through the magnetic separation was about TFe53% vanadium iron ore, magnetic separation tailings following the election with the weak magnetic sweep – High Intensity Magnetic Separation – re-election – flotation – dry separation to acquire titanium concentrates and sulfur refined cobalt ore, titanium and cobalt recovery. Daye Iron Mine making use of weak magnetic – Magnetic and flotation, comprehensive recycling iron, copper and cobalt, sulfur along with other elements.
