The quartz sand production line consumes a large amount of water during the
processing, especially in steps such as ore washing, grading, desliming,
scrubbing, concentration, and tail water treatment. In order to reduce the
consumption of water resources and environmental impact, enterprises have widely
adopted various water-saving technologies and process optimization methods in
recent years to achieve green production. Here is a detailed explanation:
1、 Water resource consumption points in quartz sand production
The main water usage processes include:
Wet crushing and ore washing
Cleaning and impurity removal process
Hydraulic grading and desliming
Thickener concentration and overflow water recovery
Tail water discharge and treatment
If water is not saved, not only will the cost be high and resources wasted
seriously, but it may also cause environmental problems and affect the
sustainable development of enterprises.
2、 Common water-saving technologies and principles
1. Tail water reuse system
Core principle: The wastewater (tail water) generated during the sand washing
process is treated through processes such as sedimentation, flocculation,
thickening, and pressure filtration before being reused in the sand washing
system, achieving closed-loop circulation.
Key equipment: Thickener, filter press, clean water tank, flocculant dosing
device.
Water saving effect: About 80-90% of the water can be recycled, significantly
reducing the amount of new water used.
2. Multi stage circulating water system
Classify and reuse water in each production process, for example:
Primary water is used for sand washing
Secondary water is used for equipment flushing
Grade III water is used for greening or sprinkling to suppress dust
Advantages: Reasonably allocate water resources, improve water use
efficiency, and avoid "high-quality water with low efficiency".
3. Combination of dry dust removal and wet dust suppression
In some non essential water use links (such as crushing and screening), bag
type dust remover and spray dust suppression system are used to replace the
traditional high-pressure washing method to reduce the washing water.
4. Efficient dehydration equipment
Using dehydration screens, thickeners, plate and frame filter presses, etc.,
to improve the recovery rate of material moisture content and reduce water
loss.
The thickener can concentrate the tailings slurry before reuse, significantly
reducing the mud concentration and relieving the pressure on the back-end
processing.
5. Intelligent Water Management System
Real time monitoring and regulation of water usage can be achieved through
online flow meters, water quality monitoring instruments, and PLC systems to
control the water usage and reuse ratio.
Avoid ineffective water use behaviors such as "excessive wandering fees" and
"excessive cleaning".
3、 The environmental benefits brought by water conservation
Water saving technology, environmental impact reduction effect
Tail water reuse reduces wastewater discharge and mitigates the risk of water
pollution
Multi level recycling of water, saving groundwater or surface water
resources
Accurate water management, reducing unnecessary water consumption and
lowering emissions
Optimization of dehydration and solid-liquid separation to reduce mud
discharge and enhance the controllable treatment capacity of solid waste
Replacing flushing with dust suppression to avoid secondary pollution
4、 Actual case (reference)
A certain quartz sand enterprise adopts a closed-loop system of
"thickening+pressure filtration+return water tank", reducing the water
consumption per ton of quartz sand from 3.5 cubic meters to less than 0.6 cubic
meters, saving more than 200000 cubic meters of water annually, and achieving
"zero direct discharge" of wastewater.
5、 Summary
Through the application of water-saving technology, quartz sand production
lines can not only effectively reduce production costs, but also significantly
reduce negative environmental impacts, enhance the green image and market
competitiveness of enterprises. The current trend is also driving production
lines towards the direction of "efficient water use+recycling+clean
production".