Fadhilah, Rahadyan Itsar (2024) Pra Rancangan Pabrik SGA (Smelter Grade Alumina) dari Bauksit Menggunakan Proses Bayer Kapasitas 400.000 Ton/Tahun. Undergraduate thesis, UPN Veteran Jawa Timur.
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Abstract
The process of making alumina briefly starts with the preparation stage, where bauxite is prepared to a size of 20 mesh and a 24% NaOH solution is prepared. After that, bauxite from the ball mill (C-123) is fed into the clarifier before being pumped into the precipitator tank (H-210). The calcination stage is carried out in the rotary kiln (B-310) at a temperature of around 950–1100°C. The product is then cooled using a rotary cooler (J-315) to reduce the alumina temperature to 50°C. Afterward, the alumina product is transported by the bucket elevator (J-316) to the ball mill (C-317) to standardize particle size to 48 mesh. Before entering the digester reactor (R-130), the NaOH solution is heated to 140°C. Inside the reactor, a reaction occurs between the alumina in the bauxite and sodium hydroxide, forming sodium aluminate with water and inert materials. The conversion rate in the digester reactor is 90%. The sodium aluminate product is then pumped to the flash tank (H-132), where the pressure drops to atmospheric levels. Next, the sodium aluminate solution is directed to the clarifier (H-133) to separate sodium aluminate from red mud. The overflow sodium aluminate solution is fed into the precipitator tank (H-210). The sodium aluminate solution is first cooled with a cooler (E-157) to a temperature of 65°C before being pumped into the precipitator tank (H-210). The resulting alumina trihydrate crystals with NaOH solution are pumped to the hydrocyclone (H-212) to separate them from the liquid containing a high NaOH content. This liquid is then directed to a mixer (M-114) to dilute it to 24%. The crystals, still in the hydrated form, are pumped and processed in a rotary drum vacuum filter (H-220) to obtain denser hydrate crystals by washing the formed cake with process water, which is then transported by screw conveyor (J-222) to the calcination stage. The liquid from the rotary drum vacuum filter (H-220) containing alumina trihydrate seeds is precipitated in the clarifier before being pumped to the precipitator tank (H-210). The calcination stage is carried out in the rotary kiln (B-310) at a temperature of around 950–1100°C. The product is then cooled using a rotary cooler (J-315) to reduce the alumina temperature to 50°C. Finally, the alumina product is transported by the bucket elevator (J-316) to the ball mill (C-317) to standardize particle size to 48 mesh.
| Item Type: | Thesis (Undergraduate) | ||||||||
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| Subjects: | T Technology > TP Chemical technology T Technology > TP Chemical technology > TP155 Chemical engineering |
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| Divisions: | Faculty of Engineering > Departement of Chemical Engineering | ||||||||
| Depositing User: | Rahadyan Itsar Fadhilah | ||||||||
| Date Deposited: | 11 Nov 2024 07:37 | ||||||||
| Last Modified: | 11 Nov 2024 07:37 | ||||||||
| URI: | https://repository.upnjatim.ac.id/id/eprint/31948 |
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