Molten Salts have been used as medium of heat transfer since many years in the Chemical, Metal refining, Glass, Nuclear and Solar Energy sectors. Molten Salts are usually a eutectic mixture of sodium, potassium, lithium or chloride based salts. A eutectic mixture is a mixture of two or more components which usually do not interact to form a new chemical compound but, which at certain ratios, form a system having a lower melting point than that of either of the components.

The range of application of Molten Salts in heat transfer technology ranges from 200°C up to 850°C depending up on the constituents of the eutectic mixture. For applications requiring a heat transfer fluid temperature above 350°C Molten Salt is the preferred medium. Water has been found to be uneconomical above 200°C due to high pressure while organic and synthetic oils start degrading above 350°C. These organic or synthetic oils also pose the problem of carbon formation and high vapor pressure, both of which are absent in the case of Molten Salts.

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All of AURO’s Molten Salt Pumps and Molten Salt Loops or Molten Salt Systems for various industry sectors are designed and manufactured in-house at facility in Gujarat, India.

Due to its stability at temperatures above 350°C nitrate-nitrite mixtures of Molten Salt have been widely used in heat transfer technology in the production organic & fine chemicals, Anhydrides, caustic soda, melamine, Glass manufacturing, metal refining and steel industry.

AURO PUMPS manufactures Molten Salt Pumps as well as entire Molten Salt systems or Molten Salt Loops for various industry sectors. These Molten Salt Loops are custom designed to suit the specific needs of every customer.

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  • Vertically submerged extended shaft pumps designed to handle molten salt at temperatures ranging from 200°C to 700°C
  • Specially developed and engineered bush bearings for optimum shaft alignment and excellent adaptation to thermal expansion
  • Separate discharge line design which eliminates the need for costly mechanical seals which face frequent failures and require extensive maintenance
  • Capacity – 1 m3/h to 750 m3/h
  • Head – up to 150 meters
  • Pump length – up to 10 meters (immersion)
  • Material of construction – High temperature Steels and Advanced Ceramics

We at AURO PUMPS aim to push the envelope and are always willing to participate in the development of new and customized pumping solutions. Customized Pumping and Loop solutions can be provided on request.

Molten salts also display a high heat retention capacity as well as higher stability at elevated temperatures as compared to HTF oil which has led to the extensive use of molten salt in the solar energy sector as both a heat transfer and thermal storage fluid.
Molten Salt Solar Power plants are of 2 types, Heliostat Central Tower with Molten Salt & heat storage and Parabolic Trough with Molten Salt heat storage.

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  • Vertically submerged extended shaft pumps designed to handle molten salt at temperatures ranging from 200°C to 550°C for both Hot Salt and Cold Salt applications.
  • Specially developed and engineered bush bearings for optimum shaft alignment and excellent adaptation to thermal expansion.
  • Separate discharge line design to eliminate the need for costly mechanical seals and avoiding frequent failures and downtime.
  • Capacity – 1 m3/h to 750 m3/h
  • Head – up to 150 meters
  • Pump length – up to 10 meters (immersion)
  • Material of construction – Metallic

We at AURO PUMPS aim to push the envelope and are always willing to participate in the development of new and customized pumping solutions. Customized Pumping and Loop solutions can be provided on request.

Fluoride based molten salts have also been used as the primary coolant in Molten Salt Reactors (MSRs) which are a class of Nuclear Fission Rectors. The salts concerned as primary coolant, mostly lithium-beryllium fluoride and lithium fluoride, remain liquid without pressurization from about 500°C up to about 1100°C, in marked contrast to Pressurized Water Reactors (PWRs) which operate at about 315°C under 150 atmospheres pressure thus making it one of the most sought after technologies across the world with many countries like India, USA, Germany, France, China, etc. racing to develop MSRs.

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  • Vertically submerged extended shaft pumps designed to handle Molten Salt at temperatures ranging from 200°C to 700°C
  • Specially engineered cantilever shaft design with optimum shaft alignment and excellent adaptation to thermal expansion. Extended shaft pumps with specially developed bush bearings are also available depending up on the composition of the Molten Salt to be pumped
  • Specially designed sealing system with argon purging for 100% sealing against ingress of oxygen or other atmospheric gases to avoid contamination of the Molten Salt
  • Capacity – 1 m3/h to 750 m3/h
  • Head – up to 90 meters
  • Material of construction – Stainless Steel / Inconel (Gr. 617, 800, 800HT, etc.) / Hastelloy-N (depending on availability) / Advanced Ceramics (SiC & Zirconia)

We at AURO PUMPS aim to push the envelope and are always willing to participate in the development of new and customized pumping solutions. Customized Pumping and Loop solutions can be provided on request.