In the wet beneficiation process of quartz sand, the treatment of tailings
slurry is directly related to water resource utilization and environmental
compliance. Shanlu Heavy Industry provides a complete equipment combination from
tailings concentration to dry discharge dewatering, suitable for tailings
disposal in quartz sand wet production lines, plate sand production lines,
fracturing sand production lines, and high-purity sand acid washing lines.
Taking a typical tailings dry discharge system as an example, the tailings
slurry (with a solid content of about 5% -15%) discharged from the front-end
magnetic separation, flotation or acid washing processes first enters the NM
thickener for gravity settling and concentration. The NM thickener designed by
Shanlu Heavy Industry adopts a central or peripheral transmission structure, and
the pool diameter can be customized according to the processing capacity. The
commonly used specifications are 6m-24m. After the slurry enters the pool
through the central feeding drum, the solid particles quickly settle with the
assistance of flocculants. The bottom flow concentration discharged from the
pool can reach 45% -55%, and the suspended solids content in the overflow water
is less than 300ppm. It can be directly reused in the production system to
achieve water resource recycling.
The bottom flow of the thickener enters the BK high-pressure diaphragm frame
filter press for deep dehydration. The filter press adopts reinforced
polypropylene filter plates, and the filtration area can be configured according
to demand. The feed pressure gradually increased to 1.2 MPa, and solid particles
formed a filter cake on the surface of the filter cloth. Subsequently,
high-pressure water is injected into the diaphragm chamber for secondary
pressing, further squeezing out the moisture in the filter cake. The BK filter
press designed by Shanlu Heavy Industry is equipped with an automatic pull plate
system and a filter cloth vibration device. The filter cake automatically falls
off during unloading, and the moisture content of the filter cake can be
controlled within 12%, meeting the requirements of dry discharge storage or
external transportation. The filtrate from the filter press is clear with a
suspended solids content of less than 100ppm, and can be combined with the
overflow from the thickener for reuse.
For tailings slurry with high fine mud content and difficult pressure
filtration feeding, Shanlu Heavy Industry can pre install DTS vibrating
dewatering screen for pre dewatering. The screening machine adopts a
double-layer polyurethane screen, and high-frequency vibration can first remove
the coarse particle size (+0.3mm) in the tailings slurry. The screened material
is directly used as a by-product of construction sand, and the undersized slurry
enters the thickener. This configuration can reduce the processing load of the
thickener and filter press, and improve the overall processing capacity of the
system.
If the production line has high requirements for recycled water quality or
the tailings slurry contains fine mineral particles, Shanlu Heavy Industry can
choose BTC ceramic filter to replace or use in conjunction with filter press.
The ceramic filter uses the capillary force generated by the micropores of the
ceramic plate to drive dehydration, without the need for a vacuum pump or
high-pressure air, and has low energy consumption. The moisture content of the
filtered cake can be reduced to 8% -10%, and the suspended solids content of the
filtrate is less than 50ppm, especially suitable for the treatment of
fine-grained tailings. The filter machine is equipped with an automatic
backwashing and acid washing system, and the ceramic plate can be used for
long-term circulation.
The above unit equipment can form a three-level dry discharge process chain
of "dehydration screen pre dehydration+thickener concentration+filter
press/ceramic filter press deep dehydration". Shanlu Heavy Industry is located
in Shandong and has over 20 years of experience in mining machinery design. Its
products cover a full range of categories including concentration, filtration,
pressure filtration, and screening. Shanlu Heavy Industry can provide equipment
selection and water tank reuse pipeline design suggestions based on the
customer's tailings slurry processing capacity and particle size
composition.
In terms of equipment details: The NM thickener rake frame is equipped with a
torque monitoring device, which can automatically lift the rake frame when
overloaded; The filter cloth of BK filter press is made of nylon monofilament
material, which is wear-resistant and not easy to block; The BTC ceramic filter
is equipped with an ultrasonic cleaning device, which effectively extends the
regeneration cycle of ceramic plates; The DTS dehydration screening box is
welded with high-strength steel plates, and the vibration motor is from a
well-known brand. These designs reduce the daily operational risks for
customers.
If you need equipment parameters or process design for quartz sand tailings
dry discharge system, please call Manager Zhang at 13583776655 (same as
WeChat).