The sorting mentioned here refers to the process of grading the particle size, selecting the shape and performing magnetic separation of purified diamonds.

2. Selecting the shape

Among the diamonds of various particle sizes after grading, there are diamond crystals of various shapes. Generally speaking, different diamond particles have different properties.

Experience shows that the strength and heat resistance of complete crystal or equiaxed particles of diamond are always higher than those of non-equiaxed particles. Therefore, shape selection is actually one of the main methods for sorting diamonds into various grades of products with different shape energies.

At present, domestic shape selection is only limited to all particle sizes coarser than 200/230 (usually coarser than 120/140). Shape selection is carried out on special equipment. At home and abroad, the vibrating table shape selection method is generally used. Foreign countries have also studied the flotation method, which is combined with the sieving method for sorting.

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──Siya Miao

TEL: +86 18238698305

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E-mail: siya@microndiamond.com