Our representative technology" four-washing, three-crushing" reflects the most advanced technology for
producing refined salt through crushing in china.
The four washing is as follows:First Screw washing Second screw washing Stand-up stirring washing
Countercurrent washingThree-crushing is as follows: First crushing Wet crushing Dry crushingThe combination
of wet crushing, dry crushing and different ways of washing has greatly improved the salt quality.
The above operation is subject to adaptation according to the users' different requirements due to the use of
crude salt of different quality
The following is the technical procedure of our typical 'four-washing, three-crushing' technology.
1.1 Washing and crushingCrude salt is put into feed hopper by forklift. On the feed hopper there is a barrier that
can separate the big block salts from the smaller ones. A vibrator installed on the side of the hopper makes the
salt supply easier.Under the feed hopper is the quantitative Screw Conveyer, whose speed can be changed to
control the system's production capacity. Crude salt is transported to the rubber belt conveyor by the quantitative
Screw Conveyer. Big foreign materials are removed by workers on both sides of the rubber belt conveyor.
The rubber belt conveyor transports crude salt to first screw washer for washing After first washing, the crude salt
comes into the opposite roller Pulverizer installed on the outlet of screw salt washer for crushing.
After first crushing, the crude salt is put into second screw washer for "second washing".
The crude salt enters second opposite roller Pulverizer for further crushing.
By this time most of the crude salt has had required granularity. The stand-up stirring washer washes the crude
salt one more time. The salt liquid is pumped into a thickener installed above
The thickened salt liquid comes into a countercurrent washer for fourth washing.
Inside the countercurrent washer, the clean brine pours down while the thickened salt liquid goes up.
The mixture of the two liquids in the movement makes the washing complete and effective.
The salt liquid condenses on the bottom of the washer and is discharged from the bottom of the countercurrent washer.
That brings to the end the whole washing process.
1.2 Dehydration and desiccationSalt liquid in pumped into the hydraulic
cyclone on the top of the centrifuge by the Salt liquid pump that is installed in the geosynclines on the bottom of the
countercurrent washer. The salt liquid is then thickened by the hydraulic cyclone.
The thickened salt liquid enters the centrifuge for dehydration. After dehydration, the crude salt is transported by
screw conveyor to the fluidized-bed dryer for drying. The fluidized-bed dryer consists of a drying section and a cooling section.
Cooling the salt makes packaging much easier. Salt comes out of the exit of the fluidized-bed dryer after drying and cooling.
1.3 Filtration and packagingDry salt is transported by screw conveyor into the feed hopper of rotary sieve for sieving.
Then the undersize salt of the required standard is transported to the quantitative packaging machine to be measured,
packaged and sealed.The oversize salt is discharged through the sieve outlet and is transported by screw conveyor to
the third opposite roller Pulverizer for final crushing.The crushed salt is returned back to be sieved until salt granularity
reaches the required standard.
1.4 Hot air systemThe hot air sent to the fluidized-bed dryer is provided by the Blast Furnace The air is produced by
burning fuels. A blower is used to transmit the hot air.The exhaust air is emitted into air. .
1.5 WasteThe air from the exit of fluidized-bed contains some salt, which is recycled and returned to the sieving system
through the exit of fluidized-bed dryer. The exhaust air from the hydraulic cyclone is led out of the workshop by a induced
draft fan, which is emitted into air after being further processed by a wet dust extractor.
1.6 The disposal of washing liquidAll the washing liquid flows into Inclined Plate Settler and the recycled salt powder is
pumped into the original system; the overflow liquor is transported into the clarifier.
| capacity |
from 500kg to 10000kg per hour |
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