Process for treating a solid material containing asbestos fibers

The process addresses the inefficiencies of existing asbestos treatment methods by using a grinding and dialysis method to regenerate and reuse acid, ensuring rapid and efficient asbestos fiber dissolution with minimal reagent consumption.

FR3166558A1Pending Publication Date: 2026-03-27AXEST
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Patent Information

Application Number
FR2024010280
Authority / Receiving Office
FR · FR
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-09-26
Publication Date
2026-03-27

AI Technical Summary

Technical Problem

Existing asbestos treatment processes require significant quantities of reagents, particularly acids and neutralizers, making them expensive and time-consuming, and involve high energy consumption.

Method used

A process involving grinding of solid material, contacting it with an aqueous acid solution, followed by dialysis through an anion exchange membrane to regenerate and reuse the acid, allowing for efficient asbestos fiber dissolution with minimal acid consumption.

Benefits of technology

The process achieves rapid and efficient asbestos fiber dissolution with reduced acid consumption, enabling continuous treatment and recycling of acid, thus minimizing the need for basic reagents and energy use.

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Abstract

The invention relates to a process for treating a solid material containing asbestos fibers, comprising the following steps: - grinding the solid material, - contacting the solid material with an aqueous acid solution, resulting in the dissolution of at least a portion of the asbestos fibers, - separating the liquid (5) and solid (4) fractions of the products resulting from the dissolution. This process is particular in that it further comprises the following steps: - dialysis by diffusion of said liquid fraction (5), in order to produce a regenerated aqueous acid solution (9), - use of said regenerated aqueous acid solution (9) in the step of contacting the ground solid material with an aqueous acid solution. The invention also relates to an installation for carrying out the process according to the invention. Figure for the abstract: Fig 1
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