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Goldmining companies face a widespread issue of fine grained and submicron gold included in the sulfide matrix of minerals, such as pyrite and arsenopyrite. [3] Various technologies for breaking down and rendering gold from sulphides are used in production to achieve high recovery rates.
A number of technologies have been introduced on an industrial scale for the full disclosure of gold in the world practice: roasting, pressure oxidative leaching, bioleaching, and ultra-fine grinding.

Standardized quartz sand with a maximum grain size of 2.5 mm was used as fine aggregate.
Acknowledgements This study has been performed with the financial support of Czech Science Foundation under the project number 16-00567S and BUT student research project FAST-J-19-6016.

It makes possible to produce complex parts with quite accurate dimensions and a fine-grained structure without defects and mechanical property anisotropy [2].
Acknowledgments This study was supported by Operational Program Research and Development for Innovations co-funded by the ERDF and national budget of the Czech Republic, within the framework of project Centre of Polymer Systems (reg. number: CZ.1.05/2.1.00/03.0111).

If a nano silicon particles dispersed porous silica itself with the structure and the space between the nano silicon can provide a large number of channels for lithium ion, increasing the insert position of lithium ions.
The use of high energy mechanical milling (HEMM) [5] technology allows silicon, porous silica brought into close contact with graphite, and generated electrochemically inert silicon carbide (SiC) can also be prevented, forming a silicon nano-grain uniformly dispersed in the composite material in the porous silica [6-7].

Beyond this, it was not possible to continue using the sin2y method, due to the strong texture and high grain size of the material.
The residual stresses measured at point H2, figures 3c and 3d, showed similar evolution, although the number of measurements was below those of point H1.

Introduction The search for innovative technologies is one of the urgent tasks facing the modern agricultural production of grain and vegetable crops.
At high magnification, it is noticeable (Fig. 1, b) that the fibers are uniform in size and do not contain a significant number of defects.

Synchrotron X-ray topography (XRT) is a powerful and non-destructive technique that enables imaging large area crystals with high resolution, where extended defects such as dislocations, stacking faults and grain boundaries in crystals can be revealed [10].
Department of Energy, under Award Number DE-AR0000907.

The absence of a transition zone and a small number of oxide inclusions compared to samples sintered at lower temperatures may indicate the completion of redox reactions.
Gradient microstructure development and grain growth inhibition in high-entropy carbide ceramics prepared by reactive spark plasma sintering // J.

Experimental Procedures Stoichiometric amount of Bi(NO3)3 and Fe(NO3)3 were dissolved in diluted HNO3 (2 M) to form an mixture aqueous solution, in which, Bi3+ and Fe3+ had the same mole number.
But we can also see that its visible light photocatalytic activity was not satisfied due to its grain defects.

The grain size of FNS used in this study varied from 0.075 mm to 0.4 mm as result of the cooling process of Smelter Feni 4, Aneka Tambang Company, Indonesia.
Acknowledgement The authors would like to thank the Vlir-Uos, Belgium for providing the financial support to this research project (The South Initiative 2020-2021) with contract number: ID2020SIN281A101.