PRELIMINARY STUDY OF THE EAST KOTAWARINGIN BAUXITE ORE CHARACTERISTICS AND ITS ESTIMATION EFFECT ON BAYER PROCESS
The need and price of aluminum metal in the world market are both increasing and <br /> <br /> on the contrary, bauxite reserves as the primary source of aluminum metal decreases. <br /> <br /> Indonesia which is located in a tropical country is an ideal region for lateritic...
Saved in:
| Main Author: | |
|---|---|
| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/29887 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | The need and price of aluminum metal in the world market are both increasing and <br />
<br />
on the contrary, bauxite reserves as the primary source of aluminum metal decreases. <br />
<br />
Indonesia which is located in a tropical country is an ideal region for lateritic bauxite <br />
<br />
formation. However, the presence of various impurity minerals in bauxite will lower <br />
<br />
its economic value, especially during processing. This study aims to provide <br />
<br />
information on the characteristics of bauxite samples taken as well as estimate its <br />
<br />
effect in Bayer process. Three samples were taken and marked with BI-01, FMA-01, <br />
<br />
and FMA-02. This research was conducted with several methods, macroscopic <br />
<br />
observation, microscopic observation, XRD analysis and XRF analysis. The results <br />
<br />
show gibbsite, hematite, and goethite are the dominant minerals. Minor minerals are <br />
<br />
maghemite, quartz, eskolaite, and corundum. The maghemite minerals are only <br />
<br />
found in samples of FMA-01 and FMA-02, but eskolaite minerals are found in all <br />
<br />
samples. Quartz and corundum minerals are only found in samples BI-01. The <br />
<br />
gibbsite minerals in the FMA-01 sample are relatively rougher in size compared with <br />
<br />
in BI-01 and FMA-02 samples. The mineral hematite is found only in samples BI-01 <br />
<br />
and FMA-01. In the FMA-02, iron oxide minerals found only goethite and present as <br />
<br />
cement. The weathering of all samples is estimated to have reached the final stage, <br />
<br />
showed by low SiO2, Mg, and the absence of Na, Ca and K, but relic texture of the <br />
<br />
three samples can still be observed. Meanwhile, Al2O3 content of the three samples <br />
<br />
do not have a significant difference. Based on XRD analysis and microscopy <br />
<br />
observations, aluminum hydroxide minerals only present in gibbsite form. The silica <br />
<br />
minerals present in quartz form are only observed in the sample BI-01. Through the <br />
<br />
characteristics of bauxite ore and its chemical composition, it is estimated that the <br />
<br />
extraction temperature is between 140 °C150 °C. The low SiO2 content both as free <br />
<br />
silica and as reactive silica in all samples gives expectation that the usage of NaOH <br />
<br />
solution during the extraction is very efficient and the product of sodium aluminate <br />
<br />
as the result of the extraction will also be perfect. <br />
|
|---|