The Most Practical Technology in Coal Preparation Plant

21 Kinds of CommonFaults of Filter Press and Their Solutions

• Fault 1: insufficient pressure
  

Treatment: the overflow valve is damaged, repaired or replaced; the oil level is not enough, supplement the hydraulic oil; the oil pump is damaged, replace the oil pump ; the valve block and the joint are leaking, tighten or replace the O-ring; the oil cylinder sealing ring is worn, replace the sealing ring.

• Fault 2: poor pressure maintaining

Treatment: the piston sealing ring is worn, replace the sealing ring; the oil way leaks, repair the oil way; the hydraulic control check valve is blocked or worn, clean or replace; the electromagnetic ball valve is blocked or worn, clean or replace.

• Fault 3: broken filter plate 

Treatment: If the feed pressure is too high during filtration, adjust the feed pressure; if the feed temperature is too high, change the high temperature plate or cool it before filtration; if the feed speed is too fast, reduce the feed speed; if the feed hole of the filter plate is blocked, clean the feed hole; if the filter cloth is damaged and the outlet is blocked, replace the filter cloth and clean it; if the coal cake is not full, clean and check to make the coal cake full.

• Fault 4: filter plate up 

Treatment: the installation foundation is not flat, and the foundation shall be reconditioned; the slag at the lower part of the filter plate is not clean, and it shall be cleaned.

• Fault 5: the filtrate is not clear

Treatment: if the filter cloth is damaged, replace the filter cloth; if the filter cloth is not properly selected, retest and replace the filter cloth; if the opening of the filter cloth is too large, replace the filter cloth; if the suture of the filter cloth is opened, re suture.

• Fault 6: noise in hydraulic system

Treatment: inhale air, open vent valve to vent; The fasteners are loose, tighten; excessive viscosity of hydraulic oil, reducing viscosity of hydraulic oil.

• Fault 7: bent girder

Treatment: if the roughness of the foundation at the oil cylinder end is not enough, reinstall it; if the arrangement of the filter plates is not parallel and the pulling plates are not synchronous, rearrange the filter plates and adjust the synchronicity of the pulling plate trolley; if the head plates are not correct, the filter press support frame is deformed, and adjust it.

• Fault 8: trolley does not pull the plate

Treatment: if the limit switch has no signal, adjust the position of the head plate; if the trolley is not in place, adjust the position of the trolley; if Y4 and Y5 do not act, replace Y4 and Y5 relays.

• Fault 9: the filter cloth is damaged

Treatment: wash the filter cloth in time if there is much slime on it; replace the underflow nozzle if the primary cyclone runs rough.

• Fault 10: Plywood timeout alarm

Treatment: if the closing proximity switch is broken, replace the proximity switch; if the pulling motor and frequency converter or reducer and chain drive mechanism are in fault, check and repair.

• Fault 11: pressing timeout alarm

Treatment: the electric contact pressure gauge is damaged, check and replace; the hydraulic system is in fault, check and repair.

• Fault 12: feed valve timeout alarm

Treatment: if the solenoid valve does not act, check and replace it; if the travel switch is broken, check and repair it; if the air pressure is not enough, check and repair it.

• Fault 13: feeding pump fails to load normally after starting

Treatment: the coupling of motor and pump is damaged, check and repair; the feed pipe is blocked, clean.

• Fault 14: shotcreting

Treatment method: the pressing force is not enough, increase the pressing force; the edge of the filter plate is mixed with slime, clean the slime; the filter cloth is folded, and the filter cloth is leveled.

• Fault 15: stop pin does not move up and down 

Treatment: if the proximity switch is in poor contact, check and replace the proximity switch; if the retaining pin mechanism fails, check the brake motor.

• Fault 16: intake valve cannot be opened during pressing

Treatment: check the air compressor for low air inlet pressure; replace the air inlet pressure gauge if it is broken.

• Fault 17: the filtrate pipe of the pressing time-space plate runs out of air

Treatment: if the filter plate is damaged, check and replace the filter plate; if the sealing ring of the air inlet of the filter plate is off, make up the sealing ring.

• Fault 18: unloading release, panel shows release timeout

Treatment: The release proximity switch is broken, replace it; Hydraulic failure, check and repair.

• Fault 19: head plate displacement too slow

Treatment: the oil on the high-pressure and low-pressure oil pumps is not normal, repair the oil filter, discharge the air in the pump, and check the performance of the high-pressure and low-pressure oil pumps.

• Fault 20: the plate pulling device frequently impacts the handle of the filter plate, but does not return

Treatment: the oil for pulling plate is insufficient, the pressure relay does not act, adjust the flow of pressure relay spring and speed regulating valve, and increase the oil circuit pressure.

• Fault 21: the oil pump is hot and does not supply oil

Treatment: if the motor or oil pump is not turned correctly, the oil is dirty, the oil level is low, the oil pump has problems, etc., adjust the rotation direction of the oil pump or motor; clean the oil pump and oil filter; refuel, check the oil pump, etc.

Nine Common Faults of Magnetic Separator and Their Solutions

• Fault 1: magnetic separation efficiency decreases 

Treatment: check whether the water level is low, reduce the discharge diameter of the tail until a certain amount of overflow overflows the downflow weir; The position of the magnet may be incorrect. If the concentrate is thick, rotate the magnet toward the discharge end.

If the concentrate is thin, rotate the magnet toward the feeding end; if the running gap is too large, readjust the roller position to reach the correct gap size; if the feeding coal slime is mixed with soil, use flocculant to remove the soil in the thickener;

If the screen gap of the demineralization screen becomes large or there is damage, the large particles entering the separation tank will increase and not be cleaned in time, resulting in no overflow or less overflow, which will shorten the magnetic separation area. The screen plate shall be replaced, and the materials in the separation tank must be flushed before starting each shift; the feed slime is mixed with flocculant, and the flocculant shall be removed from the thickener by using dispersant;

• Fault 2: too much overflow

Treatment method: if the discharge diameter is too small, increase the discharge at the tail of the machine until a certain amount of overflow overflows the downflow weir; if the solid content of the feed is too high, increase the operation gap and recheck the overflow; if the roller position is too close to the feed end, reposition the roller; if the flow is surging, install the flow surging controller or improve the feed state before the magnetic separator is fed; if the bottom of the roller is blocked, install the flow surging controller at the roller Place a rubber belt at the bottom to check (move from one side to the other). If any blockage is found, lift the roller to remove the blockage.

• Fault 3: low specific gravity of concentrate

Treatment: if the magnet position is too high, replace the magnet position; if the water level is too high, readjust the size of tailing bushing; if the discharge gap is too wide, move the drum forward.

• Fault 4: uneven distribution of magnetite powder at discharge

 Treatment: if the roller is not parallel to the discharge gap, adjust the roller position; if the water tank and roller are not parallel, adjust them with gasket until they are level; if the bottom of the roller is blocked, check and remove the blockage.

• Fault 5: worn roller skin

Treatment: there are foreign matters between scraper and rolling skin, check and clean them.

• Fault 6: high level in buffer tank

 Treatment: if there is fiber or carbon block in the grid, clear the fiber and sundries in the grid in time.

• Fault 7: tailing pipe blocked

 Treatment: there are many foam gangues. Check and wash the foam gangue under the roller frequently.

• Fault 8: concentrate pipe blocked

 Treatment: lack of water, increase water supply.

• Fault 9: block coal at the feed inlet is blocked

Treatment: if the sieve plate in the dilute medium section of the demineralization screen is rotten or broken, replace the sieve plate in time; if the medium adding pump enters the lump coal, add the medium pump and the mesh grate; if the sieve plate in the combined medium section is rotten, replace the sieve plate.

Contact HOT Mining with your coal washing plant proposal!

Miss. Lynette         Email : lynette@miningmes.com            Tel/WA:+86 19113498960

Mr.Tari                 Email : tari.wang@hot-mining.com      Tel/WA:+86 15927439651