Silicate minerals and methods for producing the same

Hydrothermal treatment at a pH of 9.4 or lower with carbonic acid effectively removes impurities from silicate minerals, producing larger particle sizes free from crystalline silica and asbestos, addressing safety and cost challenges in industrial applications.

JP7864322B2Active Publication Date: 2026-05-25SUPER NANO DESIGN CO LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
SUPER NANO DESIGN CO LTD
Filing Date
2025-05-13
Publication Date
2026-05-25

AI Technical Summary

Technical Problem

Existing methods struggle to produce silicate minerals with larger particle sizes while effectively removing impurities such as crystalline silica and asbestos, which are difficult to separate due to similar solubility and stability under various conditions, posing safety risks in applications like cosmetics, pharmaceuticals, and industrial products.

Method used

A method involving hydrothermal treatment at a pH of 9.4 or lower using hot water or hydrothermal reaction, with the presence of carbonic acid or CO2, selectively dissolves and removes impurities like crystalline silica and asbestos, while preserving the desired silicate minerals, utilizing Ostwald ripening principles to achieve particle sizes greater than 100 nm.

Benefits of technology

The method produces silicate minerals with larger particle sizes free from impurities, enhancing safety and reducing manufacturing costs by effectively dissolving and removing toxic substances, meeting industrial requirements for particle size and purity.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

To provide silicate mineral having an average particle diameter larger than several hundred nm without containing impurities such as crystalline silica.SOLUTION: The silicate mineral powder of the present invention has a crystalline silica content of 0.05 wt.% or less and an asbestos content of 0.1 wt.% or less. The mineral preferably contains carbonate and preferably has an average particle diameter of 100 nm or more. Further, the silicate mineral powder of the present invention is obtained by subjecting natural silicate mineral to warm water treatment, hot water treatment, or hydrothermal reaction treatment at a pH of 4 or more and 9.4 or less. At this time, the temperature in the warm water treatment, hot water treatment, or hydrothermal reaction treatment is 120°C or more and 370°C or less, the pressure is equal to or higher than the saturation vapor pressure of water, and the processing time is 1 minute or more and 10 hours or less.SELECTED DRAWING: Figure 3
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