Preparation and Adsorption Performance of Sodium Fluoride Adsorbent for Fluorine Gas Purification
Sodium fluoride(NaF)has been widely used in F2 purification processes due to its excellent selective adsorption performance for hydrogen fluoride(HF)in fluorine gas(F2)and its ability to regenerate and recycle.However,currently NaF adsorbents generally suffer from problems such as poor strength,low porosity,and severe pulverization,making it difficult to meet the technical requirements for preparing high-quality F2.In response to the above issues,this article proposes a new NaF adsorbent preparation process based on adhesive modification molding method and in-situ high-temperature calcination pore formation method.The optimal adsorbent synthesis process conditions are determined based on the molding effect,mechanical strength,residual carbon content,and microstructure of NaF adsorbent as evaluation indicators.The mechanical strength of the prepared NaF adsorbent is 5.56 MPa/m2,with a specific surface area of 4.3 m2/g.After 10 activations,the pulverization rate is only 9.2%,and the HF adsorption capacity can reach 431 mg/g.Compared with similar products available on the market,NaF has better application effects.
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