I’m seeking help from experts regarding domestic suppliers of rapidly detachable alumina powder, ρ-Al2O3

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Gentlemen, the company I work for has always purchased imported ρ-Al2O3 alumina； We use this alumina to make rolling balls. The company wants to purchase domestically in order to reduce delivery times and costs. I would like to ask the experts: which companies in China are engaged in this production? Thank you very much! ! ! Moderator, if the post was posted in the wrong place, please move it. Thank you! ! ! Alumina is the product obtained by heating and dehydrating aluminum hydroxide; depending on the initial form of aluminum hydroxide as well as the dehydration temperature and conditions, various forms of alumina can be produced. The morphology of alumina is very complex; to date, 8 crystal forms have been identified, namely α, γ, θ, δ, η, χ, κ, and ρ-Al2O3. Among them, active alumina mainly refers to α, ρ, η, and γ types of alumina, especially γ-type alumina.