This invention belongs to the field of
industrial waste gas treatment technology and discloses a method for treating siliceous acidic gases. It addresses the challenge of treating acidic waste gases containing
hydrogen fluoride and submicron
silicon particles generated during
tantalum-
niobium hydrometallurgical processes, solving the problems of low purification efficiency, easy
crystallization and clogging, agglomeration of
active components in absorbent materials, and high operating costs associated with traditional processes. The method converts the siliceous acidic gas into an acidic liquid through absorption by deionized water in a pre-washing
tower. A mesoporous
alumina-
zinc-based composite
absorbent material synthesized using PAA micelles as a soft template is then added. After pH adjustment and stirring, purification is completed, followed by
filtration and separation. This invention utilizes the spatial
barrier effect of PAA micelles to inhibit particle agglomeration and increase the
exposure rate of active sites. The composite
absorbent material achieves a synergistic effect of
silicon capture and defluorination, eliminating the need for high-
dose reagents, resulting in high purification efficiency, strong
system stability, and effective prevention of equipment clogging and
corrosion. It is suitable for the efficient and
environmentally friendly treatment of siliceous acidic waste gases from
tantalum-
niobium hydrometallurgical processes.