Method for measuring granularity of mineral product

By combining automated mineralogical analysis and specific gravity pre-separation with the principle of equivalent projected area, the density effect and sampling representativeness problems in particle size measurement of complex mineral products are solved, realizing high-precision and repeatable particle size distribution measurement, which is suitable for mineral products with complex composition and uneven density.

CN122084475AActive Publication Date: 2026-05-26CHANGCHUN GOLD RES INST
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Patent Information

Application Number
CN202610536596.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-22
Publication Date
2026-05-26
Estimated Expiration
2046-04-22

AI Technical Summary

Technical Problem

Existing particle size measurement methods suffer from density effect bias, sampling representativeness problems, and limitations in image analysis when dealing with complex samples with multiple mineral components, uneven density, and irregular shape. This results in large measurement errors and makes it difficult to achieve high-precision and repeatable particle size distribution measurement.

Method used

The mineral composition and theoretical density are obtained through automated mineralogical analysis, and a specific gravity liquid is prepared for pre-separation. The optimal sampling amount is calculated by combining the principle of equivalent projected area. Particle size is measured using a laser particle size analyzer and integrated according to yield weighting to achieve high-precision and repeatable particle size distribution measurement.

Benefits of technology

It effectively eliminates density effect bias and sampling representativeness issues, improves the accuracy and representativeness of particle size measurement of complex mineral products, has strong adaptability, high degree of method standardization, and good inter-laboratory comparability and repeatability.

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Abstract

The invention discloses a method for measuring the granularity of a mineral product, and belongs to the technical field of mineral analysis. The measuring method comprises the following steps: carrying out automatic mineralogical analysis on a to-be-measured sample to obtain mineral composition and mass percentage content, and calculating theoretical density; preparing a separation medium according to the theoretical density, performing specific gravity screening on the to-be-detected sample to obtain particle projection area characteristics of each density grade product, and calculating the optimal sampling amount of each density grade product in combination with the optimal sampling amount of the reference substance; and respectively weighing each density grade product, carrying out particle size measurement by using a laser particle size analyzer to obtain the particle size distribution of each density grade product, and finally, carrying out weighted calculation according to the yield of each density grade product to obtain the overall particle size distribution of the sample to be detected. According to the method, the density effect deviation is effectively eliminated, and the accuracy and representativeness of the granularity measurement of the complex mineral product are improved.
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