How should "zinc ash" as specified by item 2358 in the "Catalogue of Hazardous Chemicals" be understood? Does it include all materials commonly referred to as zinc ash in the industry? | regulatory trends

Specific Q: The Ministry of Environmental Protection's 2017 draft for the "List of Excluded Hazardous Wastes" describes the floating ash produced during the hot-dip galvanizing process as "hot-dip galvanizing ash." The 2021 version of the "List of Hazardous Wastes under Exclusion Administration" refers to the waste from this process as "hot-dip galvanizing dross." The "Frequently Asked Questions on the Directory of national hazardous wastes (2021), Second Batch" clearly distinguishes between zinc ash and zinc dross in item 5. Is it correct that only "dust collected by dust removal devices" is considered zinc ash under the Catalogue of Hazardous Chemicals (2015), and that floating ash on the surface of the zinc pot in the hot-dip galvanizing process does not fall under the zinc ash defined in the Catalogue?

A: The "zinc ash" in the "Catalogue of Hazardous Chemicals (2015)" refers to what is commonly known in the industry as zinc ash, and not to zinc ash as defined in hazardous waste terms.

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