fig21
![Recent advances in the marketing, impurity characterization and purification of quartz](https://image.oaes.cc/036f0845-0107-47fd-9d89-518c1048755f/mmm2017.fig.21.jpg)
Figure 21. Illustration of the mechanism of leaching of valuable elements by various microorganisms.
Figure 21. Illustration of the mechanism of leaching of valuable elements by various microorganisms.
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