MUMBAI, India, March 13 -- Intellectual Property India has published a patent application (202641003431 A) filed by Psg Institute Of Technology And Applied Research, Coimbatore, Tamil Nadu, on Jan. 13, for 'energy efficient synthesis of high purity nano silica from waste foundry sand and its utilization in construction industry.'
Inventor(s) include Dr. Jaisankar Karthick; Dr. Ravi Balaji; Dr. Murugesan Arun; Sivakumar Nithish; Suresh Ebanezar Ebi Dharshini; Velsamy Shivani; and Muthappa Mohamed Y Azeer.
The application for the patent was published on March 13, under issue no. 11/2026.
According to the abstract released by the Intellectual Property India: "The present invention discloses an energy-efficient and scalable process for synthesizing high-purity nano silica from waste foundry sand (WFS) and its 10 effective utilization as a partial cement replacement in cementitious systems. The process involves multi-stage water washing and acid leaching of WFS to remove clay, organic binders, and metallic impurities, followed by alkaline extraction using sodium hydroxide at moderate temperature to convert silica into soluble sodium silicate. Controlled acid precipitation of the sodium 15 silicate solution yields a hydrated silica gel, which is subsequently washed, dried, and subjected to ultrasonic probe sonication to obtain nano-scale amorphous silica particles with uniform morphology. The synthesized nano silica is evaluated as a supplementary cementitious material in cement mortar and M20 grade concrete at replacement levels ranging from 1% to 10% by 20 weight of cement. Experimental results indicate that an optimum 25 30 replacement level of about 6% nano silica provides significant strength enhancement, with compressive strength improvements of approximately 75.7% in mortar and 9.48% in M20 concrete compared to conventional mixes. The invention demonstrates a sustainable route for converting waste foundry sand into value-added nano silica and highlights its potential for improving mechanical performance and reducing cement consun1ption in construction applications."
Disclaimer: Curated by HT Syndication.
