Explore our high-purity industrial grade products designed to optimize chemical manufacturing, concentrated solar power systems, and premium water-soluble agricultural fertilizers.
As the global energy transition accelerates, Concentrated Solar Power (CSP) systems and industrial grid-scale thermal energy storage (TES) have emerged as essential technologies for achieving continuous, dispatchable renewable energy. At the heart of these applications lies a highly specific compound mixture: molten salt composed of Potassium Nitrate (KNO3) and Sodium Nitrate (NaNO3). Commonly referred to in the thermal storage industry as "Solar Salt", this binary eutectic configuration offers outstanding thermal properties, a wide operational temperature range, and economic viability.
Shanxi Vojin New Materials Co., Ltd. has established itself as an industry-leading manufacturer, developing advanced crystallization and refining techniques that minimize corrosive impurities like chlorides and sulfates. Reducing these trace contaminants is crucial for protecting high-temperature stainless steel pipes and tanks from premature corrosion, thereby extending the operational lifespan of CSP plants to over 25 years.
Critical Engineering Standard: Molten salt purity determines the corrosion rate of storage tank alloys. Vojin guarantees a chloride content below 100ppm in our solar-grade potassium nitrate.
Our commitment goes beyond traditional manufacturing. Through continuous research and development, we supply localized industrial agents, chemical producers, and renewable power infrastructure groups with custom packaging, localized delivery pathways, and strict compliance assurance. This guarantees a resilient supply chain optimized for massive thermal mass installations globally.
Delivering high-purity inorganic chemicals and molten salts to global markets with guaranteed efficiency, scale, and reliable output.
Refining high-temperature storage salts and agricultural fertilizers since 2010.
Large-scale manufacturing facilities guaranteeing stable supply chains even during market spikes.
Seamless logistics network delivering to the Middle East, Europe, Americas, and SE Asia.
Modern industrial footprint equipped with fully automated crystal purification lines.
Our core manufacturing lines cover high-grade nitrates, specialized fertilizers, and critical industrial byproducts.
Solar-grade Potassium Nitrate, Sodium Nitrate, and Calcium Nitrate for advanced industrial and energy applications.
Fully water-soluble nitrogen-potassium fertilizers designed for drip irrigation and modern precision farming.
Premium industrial carbon compounds, chloride salts, and wastewater treatment agents for complex manufacturing lines.
Understanding how molten salts drive performance across diverse industrial and clean energy sectors.
Utilized in Tower and Parabolic Trough Concentrated Solar Power (CSP) plants. Operating efficiently between 220°C and 565°C, they absorb solar heat during the day and release it at night to generate steam, enabling 24/7 clean electricity generation.
Molten potassium nitrate acts as the medium for high-temperature ion-exchange processes in screen glass manufacturing. Sodium ions on the glass surface are replaced by larger potassium ions, creating a dense surface layer with high mechanical strength.
Used to replace coal-fired heating and steam boilers in chemical parks. Molten salts store heat using low-cost, off-peak green electricity, supplying stable process steam at temperatures over 400°C for industrial manufacturing.
Thermodynamic profiles of solar-grade binary salts compared to industrial standards.
| Property Parameter | Solar Salt (60% NaNO3 + 40% KNO3) | High Purity KNO3 (Solar Grade) | High Purity NaNO3 (Solar Grade) |
|---|---|---|---|
| Melting Point (Liquid Temp) | ~220 °C (428 °F) | 334 °C (633 °F) | 308 °C (586 °F) |
| Maximum Working Temperature | 565 °C (1,049 °F) | 600 °C (1,112 °F) | 580 °C (1,076 °F) |
| Density (at 300°C) | 1,899 kg/m³ | 1,865 kg/m³ | 1,900 kg/m³ |
| Specific Heat Capacity (Liquid) | 1.56 J/g·K (at 300°C) | 1.43 J/g·K | 1.64 J/g·K |
| Chloride Content (Cl⁻) | ≤ 100 ppm | ≤ 50 ppm | ≤ 80 ppm |
| Moisture Content | ≤ 0.05% | ≤ 0.03% | ≤ 0.04% |
Standard solar salt has a melting point of approximately 220°C. Maintaining this temperature in cold climates requires continuous auxiliary electrical heating to prevent the pipes from freezing. Vojin's technical team is researching and testing ternary and quaternary formulations. By blending calcium nitrate [Ca(NO3)2] and lithium nitrate [LiNO3], we can lower the eutectic melting point to 120°C - 150°C. This advancement reduces auxiliary energy consumption in energy storage systems while maintaining a high decomposition temperature limit.
Shanxi Province is a global hub for the inorganic chemical and nitrate synthesis industries. Its abundant raw material supplies and integrated coal-chemical clusters give manufacturers direct access to ammonia, nitric acid, and potassium carbonates. Shanxi Vojin utilizes this proximity to secure high-quality feedstocks and maintain cost stability even during periods of global supply chain volatility.
Our facility runs an advanced closed-loop crystallization process. This setup reduces energy consumption by 20% compared to traditional refining methods and minimizes water usage. This focus on efficiency enables us to meet both national and international environmental standards, securing our position as a reliable supplier for global EPC contractors and industrial buyers.
With an annual capacity of 600,000 tons, we offer flexible shipping solutions, including bulk bags (1.0 to 1.35 tons) and custom poly-lined 25kg bags. These packaging designs protect our highly hygroscopic nitrate salts from moisture absorption during long-distance maritime transport.
Discover how Shanxi Vojin delivers consistent quality and value to global industrial markets.
Integrated export handling and documentation support, ensuring hassle-free logistics and compliance.
600,000 tons of annual capacity for molten salts, securing long-term contracts for large solar plants.
Dedicated engineering and chemistry support teams ready to assist with formulation and corrosion testing.
A wide range of KNO3, NaNO3, and calcium salts tailored to meet specific industrial purity grades.
Stay updated on technological breakthroughs, market trends, and innovations in thermal energy storage.
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Read ArticleDetailed technical answers to common questions about molten salt formulations, purity, and bulk supply chains.
The standard binary solar salt composition is 60% Sodium Nitrate (NaNO3) and 40% Potassium Nitrate (KNO3) by weight. This specific ratio creates a eutectic mixture that melts at approximately 220°C and remains stable up to 565°C. Shanxi Vojin can customize this ratio, pre-blend the salts, or supply them as separate high-purity components to meet the requirements of your project design.
Chlorides (Cl⁻) and sulfates (SO₄²⁻) act as strong catalysts for high-temperature corrosion in stainless steel alloys (such as SS321 and SS347) used in CSP systems. If chloride levels exceed 100ppm, the lifetime of heat exchangers and receiver tubes drops dramatically. Vojin uses an advanced recrystallization purification system to guarantee chloride levels remain below 100ppm, with premium grades dropping below 50ppm.
Both KNO3 and NaNO3 are hygroscopic, meaning they readily absorb moisture from the air, which can cause caking and handling issues at the plant site. We package our products in multi-layer woven bags containing thick PE internal liners. For long ocean voyages, we recommend shrink-wrapped pallets or moisture-barrier container liners to keep the material dry and free-flowing.
When stored in a dry, ventilated warehouse in its original, unopened packaging, potassium nitrate has an almost indefinite chemical shelf life. However, we recommend using it within 24 months of manufacture to avoid mechanical caking caused by seasonal temperature changes and humidity cycles.
Yes, our products comply with international standards. We hold ISO 9001 quality management certification and provide full REACH registration documents for clients in Europe. We also supply material safety data sheets (MSDS) and certificates of analysis (COA) for every shipment batch.
We work closely with global EPC contractors, chemical distributors, and agricultural suppliers.
Complete your chemical inventory with our secondary line of high-purity nitrate salts and water-soluble agricultural formulations.
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