Mai Kintyre (Macintyre) beneficiation plant in the northeastern state of New York阿迪隆达克mountain (Adirondack Mountains), Hudson (Hudson) River upstream of Essex County (Essex County). Processing plant belongs to the National Lead Company (National Lead Company) all.
The plant was put into operation in 1942, the original production capacity is only 3,000 tons / day, and the current processing capacity is 10,600 tons / day. Mine is 45 km railway branch line connected to the railway lines in northern New York klick (North Creek). The water in the beneficiation tailings pond is recycled, and the new water needed to be added from the Hudson River.
Useful mineral ore is a titanium ore and magnetite. Gangue minerals albite, amphibole, pyroxene, garnet, biotite and the like. The ore is tough, hard to grind, clay free and dry. The original ore contains an average of 28% iron.
The McIntyre Concentrator uses a magnetic separation process to select magnetite; the re-election-magnetic separation process is used to select coarse-grained ilmenite, and flotation is used to select fine-grained ilmenite. There are five series of plants selected, and the process of mineral processing principle is shown in Figure 1.
Figure 1 Process of mineral processing principle of McIntyre
The selected ore was first pre-screened, and the sieved product was crushed in the first stage by a 1.22×1.52 m jaw crusher with a crushing size of -203 mm. A split open product is combined with a pre-screened sieve product to a second stage sieve having a sieve size of 63.5 mm. The first and second stages of screening are carried out by grid screening. The second-stage sieved product was crushed to -38 mm using a 2.13 m standard cone crusher . The two-stage crushed product is combined with the second-stage sieved product to be fed into the third stage of a double-layer sieve of 19 and 11 mm. The two-stage sieves of -19 mm and 19 to 11 mm were respectively inserted into the magnetic pulley to remove the tailings, and the magnetic separation concentrate was fed into the short-type cone crusher for 1. The crushed product is combined with the -11 mm product under the double-layer sieve into a fine mine bin.
The mine from the fine mine silo is first fed into the grinding system of the rod mill and the curved screen closed circuit with a grinding particle size of -0.6 mm. The product under the curved sieve is rough-selected by a belt magnetic separator, and the magnetic cylinder magnetic separator is selected to obtain a magnetite concentrate, which is sent to the sintering plant after dehydration. The permanent magnet selective overflow and the magnetite dewatering overflow are pumped to the floating system to select fine-grained ilmenite. Magnetic separation tailings for coarse ilmenite classification.
The coarse-grained ilmenite is sorted by a re-election-magnetic separation process. After the magnetic separation tailings enters the titanium-selecting system, the hydraulic classifier is first divided into three particle sizes. The overflow with a particle size of -0.071 mm is sent to the flotation section, and the bottom stream is re-elected by a two-stage human shaker to obtain ilmenite. Crude concentrate, medium mine and final tailings.
The rock in the shaker is fed into a 2.1×2.1 m ball mill for re-grinding. The ball mill is sorted by ore, and the qualified fraction is returned to the magnetic separation section for re-election.
The shaker concentrate contains a small amount of magnetite and continuous body, which is selected by a permanent magnet magnetic separator, pumped to the ball mill for re-grinding, and the hydromagnetic tailings are coarse-grained ilmenite coarse concentrate, and then The Weserell type strong collision machine is selected to obtain the final ilmenite concentrate, and the strong magnetic separation tailings are returned to the ball mill for re-grinding.
The McIntyre Concentrator uses flotation to recover fine-grained ilmenite. The plant will concentrate all of the plant's fine mud, including magnetic separation overflow, magnetite dewatering overflow, re-election section classifier overflow, etc. into the flotation section.
All the ore entering the flotation section is pre-despended, and the de-sludge is carried out by a two-stage hydrocyclone with an overflow particle size of about -10 μm and a second-stage cyclone underflow concentration of 72%. The agents used in flotation are: tal oil, fuel oil, sulfuric acid, sodium fluoride and foaming agent. The flotation process is a rough selection and a second selection. The tailings are discarded in one roughing, and the coarse concentrate is selected twice to obtain fine-grained ilmenite concentrate, and the two selected tailings are returned to the rough-selected ore. The rough selection concentration is 40%.
The advantage of setting up a flotation section at the plant is that it is easier to obtain high-grade pure ilmenite than other beneficiation methods. In order to ensure the flotation results, the flotation section is equipped with test instruments and some automated devices. The five key parts have continuous measurement records, and are also equipped with gamma-ray concentration and fully automatic addition of tar oil and fuel oil.
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