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This invention relates to the field of pyrolysis technology, and in particular to a pyrolysis apparatus and method. The pyrolysis apparatus includes a chain drive mechanism, a flexible reaction net, a scraper mechanism, and a cleaning mechanism. The chain drive mechanism includes a pair of parallel and horizontally placed flat annular outer plate chains and a pair of inner plate chains, along with their driving and supporting components. The flexible reaction net is divided into inner and outer layers, including multiple pairs of wing rods spaced apart on the two pairs of plate chains and flexible rods extending inclined between the plate chains and intersecting each other. The scraper mechanism has multiple flexible scrapers. One end of the cleaning mechanism can contact and clean the outer layer of flexible rods. This invention enables direct and efficient pyrolysis of large-sized strip-shaped organic waste, solving the technical problems of existing pyrolysis devices for treating strip-shaped organic waste, such as easy softening, adhesion, and blockage of raw materials, severe coking and slagging, and high pretreatment costs.

A method for recovering hafnium and impurity metals from a hafnium-containing waste residue, comprises dissolving the waste residue in sulfuric acid and ammonium sulfate to obtain an acidic solution, adjusting acidity of the acidic solution, and adding a complexing agent to obtain a material solution; conducting extraction to obtain a hafnium-loaded organic phase and an impurity metal ions-containing aqueous phase; subjecting the hafnium-loaded organic phase to purification, stripping, precipitation, and filtration, and washing and burning to obtain hafnium oxide; precipitating the impurity metal ions-containing aqueous phase, washing a resulting precipitate to remove the complexing agent; dissolving a resulting precipitates of the impurity metal ions in sulfuric acid, and adjusting acidity of a resulting solution to obtain a solution of the impurity metal ions; extracting the solution of the impurity metal ions to obtain an impurity metal ions-loaded organic phase, purifying and stripping to obtain oxides of the impurity metals. In a hafnium oxide product obtained by the recovery method of the present disclosure, purity of hafnium oxide stably reaches 99.99% or more, or even reaches 99.999%, or 10 ppm or lower, and purity of oxides of impurity metals is greater than 97%.