Alumina yumbu wani nau'i ne na babban taurin, babban kayan jurewa, bisa ga daban-daban abun ciki na Al2O3, ana iya raba shi zuwa 99% alumina yumbu, 95% alumina yumbu, 96% alumina yumbu, 92% alumina yumbu da sauransu.Babban halayen su ne high zafin jiki juriya, corros ...
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