Engineered specifically for processing coarse tropical solar salt into chemical chlor-alkali and refined food-grade sodium chloride adhering to TCVN and international codex standards.
Multi-level linear and rotary vibrating screens integrated with high-accuracy automatic weighing, bagging, and sealing units, resistant to humid coastal climates.
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Four-stage counter-current hydrowashing process eliminating insoluble impurities, mud silt, calcium, and magnesium ions to achieve ≥99.5% NaCl purity.
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Built with food-grade multi-ply rubber belts, stainless steel structure, and sealed bearings specifically sealed to prevent brine vapor corrosion and spillage.
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Combines vortex fluidization scrubbing, micro-bubble flotation, and high-efficiency solid-liquid decantation to process harsh sea salt inputs efficiently.
View Product SpecsAn engineering analysis of Vietnam's raw sea salt production bottlenecks, growing domestic chlor-alkali deficits, and high-purity mechanical refining upgrades.
Vietnam boasts an extensive coastline exceeding 3,260 kilometers, giving rise to longstanding salt production bases across Ninh Thuan (such as Ca Na and Phuong Cuu), Khanh Hoa (Hon Khoi), Bac Lieu, and Ben Tre. Despite generating between 1.0 to 1.3 million metric tons of artisanal solar salt per annum, Vietnam faces a paradox: it continues to import hundreds of thousands of tons of high-grade industrial salt annually from India and Australia. The root cause lies in raw chemical compositions. Traditional Vietnamese artisanal sea salt carries elevated moisture levels (often 8% to 12%), significant mud/clay suspended insolubles (0.3% to 1.2%), and excessive concentrations of divalent ions—principally magnesium ($Mg^{2+}$) and calcium ($Ca^{2+}$) sulfates and chlorides.
The rapid industrialization of Vietnam’s northern hubs (Hai Phong, Quang Ninh) and southern chemical corridors (Dong Nai, Ba Ria-Vung Tau) has stimulated surging consumption for chemical grade salt. Ion-exchange membrane chlor-alkali plants producing caustic soda ($NaOH$), hydrochloric acid ($HCl$), and sodium hypochlorite ($NaClO$) require feed salt with $NaCl \ge 99.2\%$, $Ca^{2+}+Mg^{2+} \le 0.15\%$, and $SO_4^{2-} \le 0.3\%$. Raw salt direct from Ninh Thuan crystallizers cannot satisfy these membrane protections without destructive fouling and catastrophic membrane replacement costs. Concurrently, Vietnam’s dominant seafood processing sector (shrimp, pangasius, fish sauce processing in Phu Quoc and Phan Thiet) requires uniform, clean, bacterially controlled edible vacuum and washed salt compliant with Vietnam National Technical Regulations QCVN 9-1:2011/BYT and TCVN 9638 / TCVN 9639 standards.
Deploying Ruitu's custom continuous salt washing machinery enables domestic Vietnamese salt cooperatives and private chemical syndicates to transform raw solar crystals into high-margin chemical and refined food salt, directly replacing expensive foreign imports while boosting the local agricultural and salt-farming economy.
How our multi-stage purification circuit solves high impurity levels without high dissolution losses.
Crude solar lumps pass through double-roll toothed crushers submerged in saturated clean brine. This liberates inter-crystalline mother liquor pockets containing concentrated magnesium chloride ($MgCl_2$) and calcium sulfate ($CaSO_4$) without over-pulverizing the crystalline matrix.
Three consecutive counter-current washing troughs wash the salt crystals using decreasing concentration brines. As the crystal advances forward via heavy-duty stainless screws, pristine mother brine sweeps backward, continuously stripping clay sediments and soluble impurities.
Vortex liquid cyclones separate light mud flocs and fine organic debris from heavier sodium chloride crystals based on centrifugal specific gravity differentials, dumping tailings out the overflow while discharging clean crystalline magma from the underflow.
The thick crystal slurry undergoes mechanical dewatering under 1,200×G centrifugal acceleration. High-purity wash water injected at the screen surface removes remaining trace magnesium surface films, dropping free water moisture down to ≤2.5%.
Heated filtered air suspends the salt crystals in a dynamic boiling state. Indirect steam or heat exchanger energy evaporates surface moisture to ≤0.1%, with integral bag-filter collectors preventing salt micro-dust escape into factory workspaces.
Multi-deck sieves segregate precise particle fractions (e.g., 0.2–0.8 mm fine edible, 1.0–3.5 mm coarse chlor-alkali pellets). Food-grade anti-caking dosing systems ($K_4[Fe(CN)_6] \cdot 3H_2O$) preserve free-flowing behavior under high tropical humidity.
| Analytical Indicator | Raw Solar Salt (Vietnam Local Avg) | After Ruitu 2-Stage Wash | After Ruitu 4-Stage + Centrifuge + Fluid Bed | Target Chlor-Alkali / TCVN Grade |
|---|---|---|---|---|
| NaCl Purity (%) | 88.5% – 92.5% | 97.8% – 98.6% | ≥ 99.50% – 99.75% | ≥ 99.20% (Membrane Standard) |
| Moisture ($H_2O$) | 6.0% – 11.5% | 3.0% – 4.5% | ≤ 0.10% (Bone Dry) | ≤ 0.30% |
| Insoluble Impurities | 0.45% – 1.30% | 0.08% – 0.12% | ≤ 0.02% | ≤ 0.05% |
| Magnesium Ion ($Mg^{2+}$) | 0.40% – 0.95% | 0.08% – 0.14% | ≤ 0.015% | ≤ 0.03% |
| Calcium Ion ($Ca^{2+}$) | 0.25% – 0.55% | 0.10% – 0.18% | ≤ 0.030% | ≤ 0.05% |
| Sulfate Ion ($SO_4^{2-}$) | 0.70% – 1.45% | 0.25% – 0.35% | ≤ 0.120% | ≤ 0.20% |
Selecting materials to endure Vietnam's tropical monsoon humidity and coastal salinity conditions.
Procuring salt refining machinery for deployment in coastal Southeast Asia demands rigorous attention to metallurgical and mechanical durability. In provinces such as Khanh Hoa, Ninh Thuan, and Binh Thuan, ambient temperatures fluctuate between 28°C and 38°C, accompanied by relative humidity routinely exceeding 85% and constant marine airborne chloride aerosols. Standard carbon steel structures or entry-level SUS304 will succumb to aggressive pitting, stress corrosion cracking (SCC), and crevice corrosion within months under high-chloride continuous wash cycles.
Ruitu engineers implement custom metallurgy grading across all project contact boundaries:
• Wetted Crystal Zones: Fabrication in Duplex 2205 (UNS S32205) or SUS316L with electro-polished finishes. Duplex 2205 provides twice the yield strength of austenitic stainless steel and exceptional resistance to chloride stress corrosion cracking, featuring a Pitting Resistance Equivalent Number (PREN) ≥ 35.
• High-Turbulence Vortex & Centrifugal Zones: Implementation of Titanium Gr.2 lining or spray-fused high-density ceramics inside hydrocyclone spigots, centrifuge pusher baskets, and slurry pump impellers to counter combined abrasive and erosive damage.
• Aggressive Chemical Piping & Brine Valves: High-integrity ductile carbon steel armored with virgin molded fluoropolymers, specifically PTFE (Polytetrafluoroethylene) and PFA (Perfluoroalkoxy), ensuring complete chemical inertness across corrosive brine and acid dosing lines.
Investing in salt processing infrastructure within Vietnam entails strict adherence to national legal architectures:
1. Law on Environmental Protection 2020 (Law No. 72/2020/QH14): Our integrated wash systems feature closed-loop brine clarification and settling circuits. Suspended mud sediments are dewatered through filter presses into dry cakes, while clarified brine is recycled back into the washing circuit, resulting in near-zero effluent discharge into fragile coastal mangrove ecosystems.
2. Vietnam Edible Salt Standards (TCVN 9638:2013 / TCVN 9639:2013): Equipment contact points comply with Ministry of Health food contact material safety directives. Automated micro-dosing injectors accurately disperse Potassium Iodate ($KIO_3$) within the legally required 20–40 mg/kg range to support national micronutrient fortification initiatives.
Emerging mechanical enhancements advancing energy conservation and multi-mineral recovery from mother brines.
As electricity and thermal tariffs climb in Vietnam, the salt refining sector is shifting rapidly from low-efficiency coal/wood-fired rotary drum dryers toward intelligent, electrified, and resource-circular operations. Ruitu Automation remains at the forefront of this transformation through three principal engineering innovations:
1. Integration of Mechanical Vapor Recompression (MVR): While standard mechanical salt washing plants rely on thermal hot air fluidized beds to evaporate residual surface moisture, advanced food pharmaceutical-grade salt plants in Southeast Asia are merging counter-current washing lines with secondary MVR evaporation crystallizers. By re-compressing secondary steam with high-efficiency turbo blowers, the thermal energy is recycled back to heat the boiling brine, cutting thermal steam energy consumption by up to 60% compared to traditional multi-effect evaporation.
2. AI-Driven Process Monitoring & SCADA Control: Modern installations integrate distributed Siemens or Schneider PLC architectures coupled with online density meters, NIR optical moisture analyzers, and inductive turbidity sensors. Variable frequency drives (VFDs) dynamically tune centrifuge cycle speeds, conveyor feeds, and wash-brine injection rates in real time based on incoming solar salt contamination fluctuations, preventing over-washing (crystal loss) or under-washing.
3. Valuable By-product Recovery (Magnesium and Bromine Symbiosis): In conventional facilities, spent wash liquor is discarded as waste. Ruitu's EPC process layouts route concentrated reject mother liquor directly into auxiliary downstream processing lines: extracting liquid and flaked Calcium Chloride ($CaCl_2$), refractory-grade Magnesium Chloride ($MgCl_2 \cdot 6H_2O$), and elementary Bromine ($Br_2$). This comprehensive mineral utilization strategy yields multiple lucrative revenue streams from what was once an environmental disposal liability.
Clear technical guidance on system sizing, product grade targets, utilities, and overseas project delivery.
Yes. Artisanal salt from earth or plastic-lined salt pans commonly contains dark clay silts, fine mud, and insolubles ranging between 0.5% and 1.2%. Our counter-current wet-crushing and hydrocyclonic separation process physically detaches and floats away these particulates. Combining vortex scrubbing with saturated brine washing consistently upgrades the NaCl content to over 99.2%–99.5%, bringing whiteness values from ≤60 up to ≥85–90 (measured on the R457 scale), fully satisfying Vietnamese edible salt standards.
Because Ruitu utilizes saturated brine (Baumé ≥ 24.5°–25° Bé) rather than plain freshwater across all primary and secondary wash scrubbing cycles, the physical dissolution loss of raw sodium chloride crystals is limited to 5%–9% (which mainly represents the dissolution of ultra-fine dust and the mechanical purging of insoluble clay). Conventional plants using improperly balanced wash fluids often suffer devastating dissolution losses between 18% and 25%.
For an integrated 10 to 30 TPH (tons per hour) continuous washing, centrifugation, and fluidized bed drying plant, typical consumption metrics per finished ton of washed dried salt are: Electrical energy: approximately 18–26 kWh/ton; Fresh makeup wash water (for final screen rinsing and brine makeup): 0.15–0.25 $m^3$/ton; Thermal energy (for steam or indirect hot-air furnace drying from 3% to ≤0.1% moisture): 32–45 kg saturated steam (or equivalent heat value from biomass/natural gas/LPG).
We supply comprehensive EPC turnkey or supervised commissioning packages. Senior process engineers, electrical technicians, and mechanical supervisors are dispatched directly to the project site (whether in northern industrial zones like Dinh Vu, Hai Phong or southern coastal centers like Vung Tau or Ninh Thuan). Our team conducts on-site civil pre-inspections, mechanical alignment, pipework pressure tests, wet-load commissioning, and comprehensive Vietnamese/English operator training covering routine operations, PLC fault diagnosis, and preventative maintenance protocols.
Individual standalone units (such as roller crushers, pusher centrifuges, or vibrating sieves) carry typical manufacturing lead times of 30 to 45 business days. A complete turnkey modular salt washing plant (50,000 to 200,000 tons annual capacity) requires roughly 70 to 90 business days for complete workshop fabrication, assembly, dynamic balancing, and pre-commissioning testing at our Weifang facility prior to international export crating and containerization.
Field-proven mechanical processing units, anti-corrosive valves, and thermal drying systems configured for reliable operations in Vietnam.
Features high-hardness anti-corrosion teeth rolls engineered to gently break coarse salt crystals with minimal fines generation prior to hydro-washing.
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Vibrating fluid bed design ensuring uniform, scratch-free drying of washed salt down to 0.05% moisture with integrated waste-heat recovery dampers.
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Continuous filtration unit constructed from Duplex stainless steel, reducing crystal cake moisture to below 2.5% at high volumetric throughput.
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Zero dead-leg tank drain valve armored with virgin PTFE lining, offering chemical resistance against hot concentrated mother brines and acids.
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Designed for high-salinity piping systems requiring bi-directional bubble-tight shut-off without mechanical binding from salt scale buildup.
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Protects brine pumps against back-pressure shocks. High chemical reliability under continuous exposure to halogen and chloride liquids.
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Specialized rotary drum flaker and fluidized bed drying equipment converting residual salt waste brines into commercial $CaCl_2$ granules.
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High-precision mesh screening separator delivering sharp particulate classification alongside fully enclosed, moisture-sealed packaging lines.
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