METHOD OF DRY PREPARATION OF GEOLOGICAL OR TECHNOLOGICAL SAMPLES OF GOLD ORE AND PLACERS TO ANALYSIS AND INSTALALTION FOR ITS IMPLEMENTATION Russian patent published in 2009 - IPC B07B9/00 G01N1/00 

FIELD: metallurgy.

SUBSTANCE: invention relates to field of mineral dressing and can be used at preparation of samples of poor impregnated, impregnated-stringed and particularly containing high-impregnated gold of ores and placers to analysis. In method of dry preparation of geological or technological samples of gold ores and placers to analysis dry assay, containing large gold and gold in aggregates^ are grinded and directed into middle part of classifier in the form of downcomer towards to ascending air, which is transformed by means of installation by its way of vertical row of hollow truncated cones, located by big basis upwards, forming main area of classification, located inside each hollow truncated cone at level of its less basis with similar in all hollow truncated cones rates of ascending air, additional classification area, located in annular gap, restricted by inner surface of pipe and large basis of each hollow truncated cone, and convective zone, located between two neighbouring cones. In the first and the last by way of airflow, and also in directly joined to area of feeding of initial material in additional classification areas, there are created similar rates of ascending air, maximal for whole classifier, and in the rest additional classification areas rate of ascending air successively increased top-down. Received floating fraction of dry sample is directed to sedimentation into successively installed centrifugal devices, and received sinking fraction - gold-containing concentrate - regrinded and directed to treatment, similar to treatment of initial sample. After what final gold-containing concentrate is totally, and floating fraction after blending and reduction, are directed to analysis. Method is implemented at installation, containing mill, bin with shaking feeder, classifier in the form of vertical pipe, with devices for air feeding into bottom part of pipe, devices for withdrawal of floating and sinking fractions, located correspondingly in top and bottom parts of pipe, successively installed centrifugal devices, communicated to device for withdrawal of floating fractions, devices for mixing and reduction of received floating fraction. Inside the vertical pipe of classifier it is rigidly installed vertical row of hollow truncated cones, located by large basis upwards and allowing similar height and similar less basis. The first and the last in height hollow truncated cones, and also hollow truncated cones, placed directly above and under outlet port of shaking feeder, are implemented with similar geometry and maximal large basis, and large basis of the rest hollow truncated cones are implemented as increasing top-down.

EFFECT: reduction of duration of preparation of geological or technological samples of gold ores and placers to analysis, and also increasing of trustworthiness of sampling.

8 cl, 1 dwg