Ubi uhie
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Ubi uhie, nke a na-akpọkarị ihe fọdụrụ na bauxite ugbu a, bụ ihe mkpofu ụlọ ọrụ mmepụta ihe na-emepụta n'oge nhazi nke bauxite n'ime alumina site na iji usoro Bayer. O nwere ihe dị iche iche oxide compounds, gụnyere iron oxides nke na-enye ya ụcha ọbara ọbara. Ihe karịrị pasenti iri itoolu nke alumina a na-emepụta n'ụwa niile bụ site na usoro Bayer; maka tọn ọ bụla nke alumina mepụtara, a na-arụkwa ihe dịka 1 ruo 1.5 tọn apịtị na-acha ọbara ọbara. Mmepụta kwa afọ nke alumina n'afọ 2020 bụ ihe karịrị nde tọn Otu narị na iri atọ na atọ nke mere ka ọgbọ nke ihe karịrị nde ton otu narị na iri asaa na ise nke apịtị na-acha ọbara ọbara.[1]
N'ihi mmepụta dị elu a na nnukwu alkalinity nke ihe ahụ, ọ bụrụ na echekwaghị ya nke ọma, ọ nwere ike ibute nnukwu nsogbu gburugburu ebe obibi. N'ihi ya, a na-etinye mgbalị dị ukwuu n'ịchọta ụzọ ka mma maka nchekwa nchekwa na imeso ya dịka mmezi ihe mkpofu iji mepụta ihe bara uru maka simenti na simenti.
N'ụzọ a na-adịghị ahụkebe, a makwaara ihe a dị ka tailings bauxite, red sludge, ma ọ bụ alumina refinery residues.