SAKINAH, YUSRATUS (2025) Pra Rencana Pabrik Aluminium Fluoride Dari Aluminium Hidroksida dan Asam Fluorosilikat Dengan Wet Process. Undergraduate thesis, UPN Veteran Jawa Timur.
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Abstract
An aluminum fluoride plant from aluminum hydroxide and fluorosilicic acidwith a wet process capacity of 40,000 tons/year will be established in the JIIPE Gresik Industrial Estate, Jalan Raya Manyar KM 11 Manyarejo, Manyarsidorukun, Manyar Sido Rukun, Kec. Manyar, Kabupaten Gresik, East Java. This Aluminium Fluoride Plant operates on a batch system for 24 hours a day, with 330 working days and 165 employees. The plantuses Aluminium Hydroxide as raw material, sourced from PT.Indonesia Chemical Alumina located in Sanggau City, and Fluorosilicic Acidsourced from PT. Petro Jordan Abadi in Gresik City. The products producedare aluminum fluoride and silica dioxide. Aluminum fluoride canbe used in the aluminum industry; this compound plays a role in loweringthe melting point of alumina from 2,050 °C to below 1,000 °C, therebyincreasing production efficiency and reducing energy consumption. In the glass industry,aluminum fluoride is used as a flux to support the melting process and enhancethe durability of products in the production of fluoride optical fiber glass. Silica dioxide, a by-product of this factory,is also widely used in various industries, such as: an anti-caking agent toprevent clumping, used in the production of glass, ceramics, construction,and as an additive in cosmetic and pharmaceutical products. The production process used in this aluminum fluoride plant is awet process. A 20% fluosilicic acid (H₂SiF₆) solution from the storage tankis pumped into a dilution tank to be diluted to a concentration of 15%by adding water obtained from process water. After dilution,the fluosilicic acid is heated using a heater to a temperature of 65°C beforebeing fed into the reactor for the next process. The formation ofaluminum fluoride occurs in the reactor at 65°C, where the fluosilicic acidsolution from the dilution tank and aluminum hydroxide are fed intothe reactor. The reaction produces aluminum fluoride solution as the main product and solid silica dioxide as a byproduct. The main product andbyproduct are then separated using a rotary drumvacuum filter. After filtration, the aluminum fluoride solution is fed intothe crystallizer to form aluminum fluoride trihydrate crystals (AlF₃·3H₂O).The crystallizer operates at 85°C for 4.5 hours. The aluminum fluoride trihydrate crystalsand mother liquor are separated using a centrifuge. The crystals are thentransported to a calciner to convert aluminum fluoride trihydrate intoanhydrous aluminum fluoride by heating it to 605°C. The AlF₃ crystalsfrom the calciner are then directed to a rotary cooler to be cooled to a temperatureof 30°C. The crystals are sized uniformly using a 200-mesh ball millbefore packaging.
| Item Type: | Thesis (Undergraduate) | ||||||||
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| Subjects: | T Technology > TP Chemical technology > TP155 Chemical engineering | ||||||||
| Divisions: | Faculty of Engineering > Departement of Chemical Engineering | ||||||||
| Depositing User: | Yusratus Sakinah sakinah | ||||||||
| Date Deposited: | 28 Jul 2025 03:37 | ||||||||
| Last Modified: | 29 Jul 2025 04:02 | ||||||||
| URI: | https://repository.upnjatim.ac.id/id/eprint/41155 |
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