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Clean Sand Screening, Washing and Treatment System and Technology (sea sand, river sand and saline sand)

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Supplier Công ty Cổ phần Công nghệ Cát Sạch MeKong

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Technology information

Technology nameClean Sand Screening, Washing and Treatment System and Technology (sea sand, river sand and saline sand)

Technology codeCN-35540

OriginUpdating

Includes 2 granted patents:

Invention name	Patent number	Decision number	Grant date
System and method for screening, washing and classifying saline sand	35015	1907w/QD-SHTT	17/02/2023
Process for washing fine aggregates for construction	42793	154666/QD-SHTT	26/12/2024

Context and problem addressed: Investment in sea-sand screening, washing and treatment stations aims to produce clean sand that meets technical requirements for concrete, construction mortar, road foundations and ground filling, replacing increasingly scarce river sand. Vietnam has an estimated 195 billion cubic meters of sea sand resources, but natural sea sand often contains mud, dust, clay, organic impurities, soluble salts and chloride ions, so it must be washed and treated to meet TCVN 13754:2023, TCCS 49:2025/CDBVN and TCVN 9436:2012. The technology can also utilize sand from dredging channels, estuaries and seaports, helping reduce dredging and disposal costs while adding construction material supply.

Economic and social benefits: Reduces cement used in mixing by 10%-17% (Can Tho University research project, 2014); increases concrete strength by 10%-20% (Quatest 3 laboratory technician guide, 2007); controls Cl- ions to meet road embankment standards issued by the Ministry of Transport (<0.01% for prestressed concrete, <0.05% for ordinary concrete).

Technical specifications

TECHNICAL SPECIFICATIONS AND CAPACITY OF THE SEA-SAND SCREENING AND WASHING SYSTEM

Item	Specification
Design capacity	150 m3/hour (raw sand, operating 9 months/year); can be designed up to 1,000 m3/hour as required
Production capacity	1 shift/day: 259,200 m3/year - 2 shifts/day: 518,400 m3/year
Power consumption	Total capacity 100 HP (recommended transformer station >= 150 KVA)
Freshwater demand	4 m3 water / 1 m3 raw sand (surface water from rivers and canals)
Installation area + finished product yard	>= 0.8 ha
Settling pond for water and impurities	>= 1.5 ha
Wastewater to be treated	4,800 m3/shift (8 hours) - total 9,600 m3/day (2 shifts), treated through settling ponds before discharge
Quality after treatment	Organic impurities < 1%, chloride ions (Cl-) < 0.01%
Input materials	Hill sand, mountain sand, river sand, stream sand, sea sand and saline sand
Applicable standards	TCVN 13754:2023 (saline sand for concrete and mortar); TCCS 49:2025/CDBVN (road foundations using sea sand); TCVN 9436:2012 (sand for filling)

Key advantages

The sand screening and washing equipment system has won domestic and international science awards and received a Certificate of Merit from the Prime Minister for contributions to research and development of technologies applied in real production.
Industrial-scale production, with capacity of 100-500 m3/hour/equipment and expandable up to 2,000 m3/hour/equipment when required, meeting large-scale exploitation needs at industrial parks, seaports, sand mines and key projects.
Domestic production with a more reasonable cost than imported equipment, optimizing investment costs while maintaining quality.
Highly automated, easy to operate, and uses no chemicals in the sand washing process (only freshwater circulated through multiple settling and filtration basins before discharge), making it an environmentally friendly solution aligned with green and sustainable economic development.

Practical applications

Organizations and individuals exploiting or trading sand who need technology transfer, transfer of technology use rights, services for screening and washing natural or crushed sand into fine aggregates (clean sand for concrete, plastering mortar and filling), or partners who need system installation and equipment transfer.