Abstract
Introduction. Sample preparation schemes are multi-stage. Sample reduction in the process of preparation introduces extra inaccuracy in the result of sampling, consequently, sample preparation schemes inaccuracy should be calculated with further selection of its rational parameters. Research methodology is based on calculation by the formula of sample reduction random inaccuracy. Inaccuracy calculation of a sample preparation scheme. Calculation has been carries out of the scheme recommended by GOST 14180-80. Paradoxical growth of inaccuracy of sample preparation has been shown with ore homogeneity growth. Determination of sample mass by the stages of preparation. Standards and techniques of ore and nonferrous metals concentrates sampling for the creation of sample preparation schemes recommend finding the coefficient in minimum mass formula depending on the mass fraction variation coefficient in the sampled product. Sample preparation is carried out in laboratory conditions, and sample mass cannot depend on this coefficient of variation. Sample inhomogeneity in the laboratory depends only on the inhomogeneity of separate lumps of a sample. Sample inhomogeneity in the preparation laboratory is defined by lump dispersion, and the coefficient is the function of this dispersion, admissible inaccuracy of sample reduction and the dimensions of grain impregnations of the mineral which contains the analyte. 78 "Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal". No. 1. 2020 ISSN 0536-1028 For each factory, individual coefficient can be found, and sample masses can be calculated by the stages of preparation. Analysis of sample preparation schemes. Sample preparation scheme inaccuracy formula is given. Calculation and analysis of the model scheme of sample preparation according to GOST 14180-80 have shown that at the third crushing stage the sample is advisable to be crushed not up to 3, but up to 2 mm, and the recommended sample size at the final stage 8.08 hardly improves the result of preparation, that is why the previous recommendation of 0.1 mm can be used.
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