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precious metal-bearing waste blue film sheets

     

Current pretreatment methods for precious metal-bearing waste blue film sheets include the roasting method and wet stripping method, with the latter further categorized into inorganic solvent stripping and organic solvent stripping.

The roasting method features a short treatment process, as alloy feedstock can be directly obtained after roasting. However, it comes with high investment costs, as it requires the procurement of incinerators and flue gas treatment facilities (a large volume of hazardous flue gas generated during roasting needs proper treatment), leading to elevated environmental protection costs.

The organic solvent-based wet stripping method has the edge in easy scaling and automated production. Nevertheless, it is plagued by defects including long process flow, high requirements for production equipment, large reagent consumption, severe health hazards to humans caused by highly volatile reagents, and intractable waste liquid disposal.

As for the inorganic solvent-based wet stripping method, it also has shortcomings such as long treatment process, low level of mechanization during operation, and relatively low treatment efficiency.

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