METHOD OF A QUALITY CONTROL OVER THE TEST CRUCIBLE MELTING Russian patent published in 2006 - IPC C22B11/02 G01N33/20 

FIELD: nonferrous metallurgy; methods of detection of the noble metals in the mineral raw materials.

SUBSTANCE: the invention is pertaining to nonferrous metallurgy, in particular, to the methods of detection of the noble metals in the mineral raw materials. The technical result of the invention is an increased trustworthiness to the results of the testing crucible melt analysis. The method is conducted in the following way. From the material of the laboratory test sample take out the analytical part of the filler, mix it with the calculated amount of the charge and the mixture is smelt according to the standard method. During the smelt visually control the height of the boiling layer of the melt slag and lead. On completion of the smelt measure the mass of the slag and lead and calculate an admissible height of the boiling layer of the melt according to the following formula:_{0,9·Hm≥Hc≥[1,9/tg²α/2·(Mш/ρш+Mc/ρc)]^1/3, whereHcr - depth of the crucible in meters(m);Hsl - the height of the boiling gas-slag layer, m; α - an angle at the apex of the cone of the inner surface of the crucible, in degrees;Msl, Mla - masses of the slag and mass of the lead alloy accordingly, kg;ρsl, ρla - density of the slag and density of the lead accordingly, kg/m³. If the visual estimation of the height of the boiling layer of the melt exceeds the limits of admissible values, them one may draw a conclusion about the low quality of the testing smelt, make corrections in the composition of the charge and repeat the test analysis.}

EFFECT: the invention ensures an increased trustworthiness to the results of the testing crucible melt analysis.

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