A Comprehensive Analysis Of The Magnetic Separator
A magnetic separator is a magnetic sorting machine based on material magnetism difference
, which applied to iron elimination of powder grain, wet magnetic separation of magnetite, pyrrhotite, roasting ore, limonite and other materials of granularity below 3mm and remove iron for coal, non- metal ore, building materials and other materials. It is one of the most widely used and high commonality machines.
It is composed of base, upper magnetic system, lower magnetic system, cage, hollow shaft, and concentrates tank and transmission devices. Base installation should make hollow bearing bush as a benchmark to measure the elevation and levelness. Positioning lower magnetic system should base on the docking station. The gap adjustment between cage and upper and lower magnetic system must be accurate whose limited deviation is 0 +1 mm.
In 2005, the concentrator factories adopt high frequency Vibrating Screen and composite tailings selection technology and flashing magnetic separator. As a result, the ore tailings final grade was reduced by an average of 2.44%. Figures showed that we annually may elect from the tailings 31,190,000 tons of iron ore concentrate, with the concentrate grade 67. 13%, this can achieve annual benefit of RMB 54 million. Production practice of iron ore tailings re-election indicates that ore concentrator factories discharge 2.28 million tons of tailings a year. The tailings processed by the JHC rectangle ring type magnetic separator, and we gained elected rough ore concentrate, and then the concentrator is pumped to a separate built concentrate plant. It will go through weak magnetic separation, grinding-classification, magnetic dewatering tank and double drums weak magnetic separation process, and finally we get the final ore concentrate.
Many users do not understand why the concentrator needs to deal with the tailings. They think that is a way with low efficiency. If they have time, it's better to dressing by magnetic separation directly for the source ore, which will increase the working efficiency.
In fact, the definition of tailing is relative. There are a lot of useful components in the tailings. After the crude ore entering the concentrator with crushing, grinding and sorting operations, the useful minerals in the ore are selected as one or more products, and the tailings are discharged as slurry. The rate of pure mineral is low and the fine mineral rate of non-ferrous metals is only 10% to 20%. The number of tailings is large with a yield generally reaching 80% to 90%, even larger. What's more, the higher ore grade is, the bigger fine mineral rate is, and the less tailings quantity is. With current technical level, it is difficult to recycle some precious metals and rare metals. The disposal of tailings is not only related to environmental protection, rational use of resources, but also related to the legal aspects. Therefore, it has important significance to deal with tailings properly.
User frequently encounter motor overheating and other issues, the following is the summary of common faults and solutions:
1. Motor overheating and sound informality.
Reasons:
1) undesirable bearing lubrication or bearings badly worn;
2) fan leaves fall off or wore;
3) switching circuit badly contacted, or disconnected to run single-phase;
4) too low voltage.
2. Sound informality, cylinder stuck by obstacle, and even the cylinder cannot vibrate in operation.
The common reasons are objects in the bottom box are stuck, or magnets falling off cause tube skin scratched. At this time, maintenance and troubleshooting are necessary.
3. Reducer overheating:
1) insufficient fuel or bad oil;
2) over-wearing or bad engagement between gear and worm,;
3) undesirable bearing lubrication or bearings badly worn.
4. Magnetic field strength becomes weaker:
1) over- high temperature;
2) sun exposure;
3) acid corrosion. This can be measured by Gauss Meter.
Rotary dryer : http://www.crusher-export.com/dryer.htm
Vibrating screen : http://www.hxjqcrusher.com/Circular-vibrating-Screen.html
by: libby
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