Bauxite (bauxite ore) tọka si ọrọ apapọ fun awọn ohun alumọni ti o le ṣee lo ni ile-iṣẹ, nipataki ti gibbsite, boehmite, tabi diaspore. O jẹ orisun ti kii ṣe sọdọtun. Bauxite mimọ jẹ funfun ni awọ ati pe o le han grẹy ina, alawọ ewe ina, tabi pupa ina nitori awọn idoti oriṣiriṣi. Bauxite ni ọpọlọpọ awọn ohun elo ile-iṣẹ. Ni apa kan, o jẹ ohun elo aise akọkọ fun iṣelọpọ alumina, eyiti o ṣe agbejade aluminiomu. Ni apa keji, o jẹ lilo pupọ bi ohun elo aise ni awọn ile-iṣẹ bii awọn ohun elo ifasilẹ, corundum dapo, awọn ohun elo lilọ, awọn ọja seramiki, awọn ọja kemikali, ati slurry alumina giga.
Calcined bauxite contains hydrated alumina and aluminum hydroxide, obtained by calcining high-quality bauxite at high temperatures (85°C to 1600°C) in a rotary kiln. It is one of the main raw materials for producing aluminum. Compared with the original bauxite, after removing moisture through calcination, the alumina content of the calcined bauxite can be increased from about 57% to 58% of the original bauxite to 84% to 88%.
Bauxite |
Iwọn (mm) |
Al2O3(%) |
SiO2(%) |
O ga(%) |
Fe2O3(%) |
MC(%) |
88 |
0-1,1-3,3-5 |
88 |
<9 |
<0.2 |
<3 |
<2 |
85 |
0-1,1-3,3-5 |
85 |
<7 |
<0.2 |
<2.5 |
<2 |
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Xingang Port tabi Qingdao Port, China.