Through the identification of rock and minerals, it is possible to know exactly which minerals exist in the beneficial and harmful elements; to find out the type, content, embedding granularity and mosaic relationship of the litter in the ore ; and to determine the dissociation degree of useful mineral monomers in the ore-selecting products. .
Common methods of measurement include macroscopic and microscopic identification. Commonly used microscopes include solid microscopes (binocular microscopes), polarized microscopes, and reflective microscopes.
The stereomicroscope is only placed in a large role and is a simple continuation of the naked eye. It is used to place the image of the object and observe the surface features of the object. When observing, the ore debris is first spread on a glass plate as a thin layer, and then directly observed, and the minerals are identified according to the characteristics of the mineral form, color, gloss and cleavage. The microscope has a low resolving power, but the observation range is large, and the stereoscopic image of the mineral can be seen. The mineral type, the particle size and the interrelationship between the mineral particles can be initially observed to estimate the mineral content.
Polarized microscopes can only be used to observe transparent minerals.
The retroreflective microscope is equipped with a vertical illuminator on the microscope tube. It is suitable for observing opaque minerals. It is required to grind the observation surface of the ore into a smooth plane, that is, to make the ore into a light sheet suitable for microscopic observation. Most of the useful minerals are opaque minerals that are primarily identified using this microscope.
There are three methods for determining the mineral content in the ore under the microscope: the area method, the straight line method and the counting method. The specific measurement of the area of ​​the mineral to be tested (lattice), the line length, the number of points, and the workload are compared. Big. In the ore dressing test, if the accuracy is not high, the estimation method can also be used, that is, directly estimate the relative content percentage of each mineral in each field of view. At this time, it is preferable to use a cross wire or a mesh eyepiece so as to be easily estimated by the grid. After many observations and accumulated experience, the estimation method can also get quite accurate results. The above various methods are used to first obtain the volume percentage of the mineral to be tested, and multiply the density of each mineral to calculate the mineral content percentage of the sample.
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