Seng , Sophea (2015) Evaluation And Processing Of Andalusite Mineral From Terengganu, Malaysia. Masters thesis, Universiti Sains Malaysia.
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Abstract
Dalam penyelidikan ini sampel daripada dua kawasan iaitu Sungai Cerul dan Kemasik, Terengganu telah dikaji. Mineral andalusit dalam bentuk kristal jelas dapat dilihat dalam julat saiz 2 cm to 5 cm tertanam atau tersimen bersama filit dalam sampel yang diperolehi dari Sungai Cerul. Manakala kehadiran mineral andalusit sukar untuk dilihat dalam sampel yang diperolehi dari Kemasik. Gred mineral andalusit dalam sampel Sungai Cerul menunjukkan ia mengandungi lebih kurang 49.13% Al2SiO5 manakala analisa ke atas gred kristal andalusit mendapati ia mengandungi sehingga 73.35 % Al2SiO5. Disebabkan peratusan andalusit yang tinggi, deposit ini mempunyai potensi untuk dieksploitasi. Sampel yang diperoleh dari Kemasik terjadi dalam persekitaran geologi yang sama dengan sampel dari Sungai Cerul namun andalusit tersebar di dalam filit sebagai batuan perumah. Walau bagaimanapun, kejadian mineral andalusit di Kemasik telah terjejas oleh luluhawa yang tinggi serta perubahan sekeliling. Sampel dari Kemasik, tiada bentuk kristal andalusit yang tertentu terdapat di dalam batuan perumah dan gred Al2SiO5 yang terkandung adalah kira-kira 40.81 %. Di samping itu, ciri-ciri fizikal andalusit yang secara perbandinganya sukar untuk diproses secara fizikal maka mendapan ini dikategorikan sebagai tidak berpotensi buat masa ini. Eksperimen pengisaran yang dilakukan, menggunakan sampel andalusit dari Sungai Cerul, menunjukkan bahawa kelajuan putaran rod yang optimum bagi membebaskan mineral andalusit dari batuan perumah adalah pada kelajuan 20 putaran per minit (rpm) selama 40 minit. Pembebasan dan pemisahan andalusit dari batuan perumah berjaya meningkatkan gred andalusit sekitar 13.14% Al2SiO5. Dengan rawatan gelombang mikro, pembebasan telah bertambah baik dan meningkat sehingga 17.44 % Al2SiO5. Selain peningkatan gred andalusit, masa pengisaran juga berkurangan dari 40 minit ke 15 minit dengan peningkatan pembebasan daripada 60% kepada 70%. Di samping itu, rawatan gelombang mikro dengan suhu yang rendah dalam keadaan basah menunjukkan hasil yang baik bagi pemecahan antara muka. _____________________________________________________________________________________________________ In this research, two andalusite bearing rock samples from Sungai Cerul and Kemasik, Terengganu areas were studied. Coarse andalusite crystals in range of 2 cm to 5 cm in length were found embedded or cemented with phyllite in sample from Sungai Cerul. Whereas, the presence of andalusite crystal in the andalusite bearing rock sample from Kemasik was hardly to be observed. Grade of andalusite bearing rocks from Sungai Cerul indicated that it is contain approximately 49.13% Al2SiO5 and analysis on the andalusite crystal found that it contains up to 73.35% Al2SiO5. Due to the high percentage of andalusite, this deposit has the potential to be exploited for its value. The samples from Kemasik occurred in similar geological environment as in Sungai Cerul which is disseminated in phyllite as host rock. Though, the occurrence of andalusite mineral in Kemasik was affected by high weathering and alteration. Compared to samples from Sungai Cerul, the andalusite bearing rock from Kemasik have no specific andalusite crystal shape in host rock and the grade of Al2SiO5 is about 40.81% Al2SiO5. Due to the physical properties of andalusite from Kemasik is comparatively difficult to be processed by physical methods this deposit was considered not viable for the time being. The experimental works on grinding performance on andalusite bearing rock from Sungai Cerul indicated that the optimum rotational speed of the rod mill to liberate the andalusite mineral from the host rock is at 20 rpm for 40 minutes. The liberation and separation of andalusite from the host rock managed to improve the grade of andalusite approximately 13.14 % Al2SiO5. With the microwave treatment, the liberation has been improved and increased the grade of andalusite up to 17.44 % Al2SiO5. Grinding time was also reduced from 45 minutes to 15 minutes with better liberation from 60% to 70% when microwave treatment was applied. In addition, the microwave treatment with low temperature in wet condition show a good result of the breaking the andalusite crystal interface.
| Item Type: | Thesis (Masters) |
|---|---|
| Additional Information: | Full text is available at http://irplus.eng.usm.my:8080/ir_plus/institutionalPublicationPublicView.action?institutionalItemId=3071 |
| Subjects: | T Technology T Technology > TN Mining Engineering. Metallurgy > TN263-271 Mineral deposits. Metallic ore deposits. Prospecting |
| Divisions: | UNSPECIFIED |
| Depositing User: | Mr Mohd Jasnizam Mohd Salleh |
| Date Deposited: | 29 Aug 2018 07:13 |
| Last Modified: | 29 Aug 2018 07:14 |
| URI: | http://eprints.usm.my/id/eprint/41571 |
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