Ngwa:
Mpempe akwụkwọ mpịakọta dị elu nke otu draịva na-egweri bụ nke a haziri ahazi iji gwerie clinkers ciment, afuru efu nke ịnweta, igwe nchara na ihe ndị ọzọ n'ime.
obere granules, ka ultra-egwepịa metallic mineral (iron ores, manganese ore, ọla kọpa ores, lead-zinc ore, vanadium ore na ndị ọzọ) na
iji gwerie mineral ndị na-abụghị ọla (coal gangues, feldspar, nephe-line, dolomite, limestone, quartz, wdg) n'ime ntụ ntụ.