Method of a quality control over the test crucible melting |
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IPC classes for russian patent Method of a quality control over the test crucible melting (RU 2272850):
  
 Method of preparing samples for analysis / 2267111
Method comprises sampling initial material, producing and analyzing group samples before assessing representative mass of analytical samples, estimating representative mass of analytical samples, and calculating the value of the coefficient that characterizes the type of gold-bearing material from the formula proposed.
 Method for determining hardness limit of austenite class steel / 2265213
Method includes subjecting samples of steel to preliminary plastic deformation and on basis of wear test results of pre-deformed samples, graph of change of hardness limit of σ-1 samples is built dependent on their level of pre-deformation. Weighed samples are made with same deformation level and value of magnetic tear force Pmag is determined for each weighed sample. Graph of change of magnetic tear force Pmag is built for samples on basis of their pre-deformation level, graph with adjusting curve in coordinates Pmag - σ-1, setting a connection between Pmag and σ-1 dependent on level of pre-deformation. Hardness limit of σ-1 samples is determined by adjusting curve in coordinates Pmag - σ-1.
 Method of measuring duration of serviceability of metals / 2261436
Method can be used for estimation of deformation-strength properties due to applying load as well as for determining damages by means of X-ray diffraction analysis. Values of structural-sensitive parameter of crystal lattice of tested material are determined by X-ray diffraction analysis in initial and post-deformation states. Deformation-strength characteristics of metal are determined by calculation from changes in structural-sensitive parameter. Serviceability is judged by comparing really achieved characteristics with admissible ones. Width of X-ray line β is used as structural-sensitive parameters. Strength of deformation P, deformation Δl provided by the deformation and corresponding values of structural-sensitive parameter β are registered during testing. Dependence of true stresses S and structural-sensitive parameter β on degree of relative residual deformation δ are calculated on the basis of P and Δl. Destruction diagram (S-δ½) and linearized diagram (β½-δ½) are built to show inflection points. Deformation-strength characteristics SD and δD corresponding to inflection point at destruction diagram (destruction point D) is taken as criterion of admissible surface strength which provides maximal serviceability of metal. Factor of merit η and factor of destruction Δ can be also taken as criteria of serviceability of metal.
 Mode of testing railway rails on contact weariness / 2253112
Contact weariness is induced by high-frequency dynamic components of interaction of wheels and rails, which become apparent at moving at high speed. The mode of testing railway rails on contact weariness is in that tested samples of rail steel are rolled by pinch rolls in longitudinal direction until appearance on the surface of the sample of dents and also deep indents. As samples test rails are used. The diameter of a pinch roll is chosen under condition of equality of reduction ratio of linear size of the site of contact of the pinch roll with the rail along the axis of the last in comparison with corresponding size responsible to conditions of exploitation and speed reduction ratio of rolling motion of the pinch roll along exploited rail.
Material for production of assay stone / 2248336
Assay stone is made from oxide ceramic comprising BeO-TiO2. Material affords the ability to obtain assay stone of regular geometric form with surface, electrical and mechanical properties meeting the requirement for material used in assaying control. Claimed material in useful in standard determination followed by electrochemical recovery of precision metals from solution after assaying control.
 How kopaliani lead alloys containing gold and silver, assay analysis / 2237734
The invention relates to the field of analytical chemistry and can be used in the assay analysis for separating precious metals from lead
 The way to control the processing of gold-bearing samples / 2232824
The invention relates to analytical chemistry and can be used for testing gold-bearing natural materials
Method for determination of copper / 2201592
The invention relates to the field of analytical chemistry
 The device for preparation and analysis of samples of liquid alloys / 2174207
The invention relates to metallurgy, and is intended for receipt and analysis of samples of liquid alloys in the laboratory of metallurgical processes on the surface of the alloy and may find application in research laboratories
Method of extraction of noble metals / 2272084
Proposed method increases degree of extraction of noble metals into alloy at eutectic melting due to increased degree of extraction of micro-dispersed phases (nano-particles) and atoms of noble metals found in dislocations (linear defects) and micro-cracks of crystal lattices of initial materials. To this end, material from which noble metals are to be extracted is mixed with charge of alkaline composition and mixture is subjected to eutectic melting, thus obtaining alloy of these metals. Immediately before melting, mixture is subjected to mechanical activation continued for 0.0833-2 h at maintenance of ratio of delivered mechanical energy power to relative surface of mixture within 0.0133-25 W x kg x m-2. Eutectic melting of mixture is performed at temperature above 500°C. Ratio of mass of charge to mass of material is selected within 0.75-2; used as charge is mixture of sodium tetraborate with sodium carbonate, sodium tetraborate with sodium bicarbonate, sodium tetraborate and sodium carbonate and lead mono-oxide, sodium tetraborate with sodium bicarbonate and lead mono-oxide.
 Method of production of silver from silver chloride by reduction with gaseous hydrogen / 2265673
Proposed method includes reduction of silver chloride at heating and holding at heat in flow of gaseous hydrogen, bubbling of gas escaping from reaction chamber through water and obtaining aqueous solution HCl. Reduction is performed from silver chloride formed at refining of noble metals and ground to size of ≤100 mcm and located in reaction chamber at thickness of layer of ≤20 mm at temperature of 450°C±5°C by gaseous hydrogen heated to holding temperature.
Method for processing products containing non-noble metal chalcogenides, platinum group metals and gold / 2260629
Method comprises steps of treating material with nitric acid solution till oxidation-reduction potential 500-700 mV; extracting non-soluble residue; melting it at adding sodium-containing fluxes, carbon -containing reducing agent and copper- and(or) iron-containing industrial process product obtained at hydrolysis or cementation treatment of solutions of refining production; settling and cooling melt till its solidification. Solidified product is separated according to interface boundaries. Then separated bottom phase of heavy alloy is disintegrated to powder. Method allows to extract to target alloy up to 94% of platinum and palladium, more than 97% of rhodium, iridium and ruthenium. Disintegrated alloy may be processed as concentrate of refining production.
Method of recovering gold from gold ore concentrates / 2259410
Invention relates to selective recovery of gold from gravitation and flotation concentrates of gold-recovery fabrics in the stage of adjusting gold-containing products to condition meeting affinity requirements. Method of recovering gold from gold ore concentrates into lead melt comprises dispersing molten lead at vigorous blade agitator-mediated mechanic stirring in common with gold-containing concentrate in presence of molten alkali (NaOH) at concentrate-to-alkali weight ratio 1:(1-3) and temperature 400-550°C depending on mineralogical composition of concentrate.
Method of recovering silver from waste / 2258091
Recovery of silver from waste, such as spent catalysts and ashes, us accomplished by charging waste into soda-borax melt taken in such proportions that weight of soda is by 2.0-3.5 times superior to that of oxide constituent of starting material and weight of borax constitutes 8-20% that of soda. Melting is effected at 1120-1350°C and melt is aged then for at least 15-20 min, after which products are separated and silver is recovered. Weight of charged waste (Pw) is found in dependence of content oxide constituent therein using formula (wt %): Pw = (11.5-16.7)MeO+(0.5-1.0)Na2B2O7+9SiO2 ( Me is Ca, Al, or 2Na).
Method of separating multicomponent material containing metallic components / 2248406
Multicomponent waste material is preliminarily impregnated with solution of salt of metal-collector in amount ensuring weight content of metal-collector in melt exceeding content of metallic components therein. Material is then calcined and melted in reductive atmosphere after addition of slag-forming flux based on metal fluorides. Melt is stirred and kept in liquid state over a period of time long enough to allow separation of slag and metallic phases. Resulting slag and metal are tapped and mechanically separated when solidified.
Gold content determination in gold-containing raw material / 2245931
Claimed method includes sampling the probe of starting material, grinding, mixing with massicot, smelting to form bullion, parting of gold-silver globule, weighting of gold sinterskin. Probe is sampled from starting natural solid organic material. Before smelting mixture is packaged in lead foil, established in full-hot scorifying dish, and padded with borax and table salt.
The method of extracting precious metals from gravity concentrates / 2240367
The invention relates to pyrometallurgy, in particular to the recovery of precious metals from gravity concentrates
 Method of oxidizing roasting of sulfide concentrates / 2240366
The invention relates to pyrometallurgy and can be used to implement the oxidative roasting of gold gravity and flotation concentrates containing significant amounts of sulphides of metals (up to 100%)
How kopaliani lead alloys containing gold and silver, assay analysis / 2237734
The invention relates to the field of analytical chemistry and can be used in the assay analysis for separating precious metals from lead
Gold content determination in gold-containing raw material / 2245931
Claimed method includes sampling the probe of starting material, grinding, mixing with massicot, smelting to form bullion, parting of gold-silver globule, weighting of gold sinterskin. Probe is sampled from starting natural solid organic material. Before smelting mixture is packaged in lead foil, established in full-hot scorifying dish, and padded with borax and table salt.
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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. 3 ex
The method relates to analytical chemistry and can be used for determination of noble metals in mineral raw materials. The known method [1, s] quality control of melting, including cleaning of the crucible with melt them in charge of approximate composition: 60 g Na2CO3, 20 g of Na2B4O7·10H2O, 50 g of PbO, 3 g of reducing agent (starch, flour) and analysis of lead alloys, obtained in the process of "purification" of the crucibles. This method increases the reliability of the assay results of the analysis, but has the following disadvantages: - increases the cost of assay analysis; - reduces expressnet assay analysis. Closest to the proposed method is a method [2, p.124] quality control assay crucible for melting determination of noble metals in mineral raw materials, including smelting of the charge with the extraction of precious metals in lead alloy and visual inspection of the color obtained lead alloy and otdelimosti it from slag, homogeneity and degree of acidity of the slag. This method does not allow to control the surface tension of the slag and hydrodynamic regime of melting depends on the degree of extraction of precious metals from molten slag in the lead alloy. The technical result of the invention is to increase the reliability of the results is the ATA assay analysis. The technical result is achieved in that in the method of quality control assay crucible for melting determination of noble metals in mineral raw materials, including smelting of the charge with the extraction of precious metals in lead alloy and visual inspection of the color obtained lead alloy and otdelimosti it from slag, homogeneity and degree of acidity of the slag according to the invention, the quality control visually the height of the fluidized bed of molten slag and lead to a valid value which is calculated by the formula:
where Nm- the depth of the crucible, m; Hc- the height of the fluidized bed of molten slag and lead, m; α - the angle at the vertex of the cone inner surface of the crucible, C; MW, Mwith- the mass of the slag and weight of the lead, respectively, kg; ρWthat ρwiththe density of the slag and the density of lead, respectively, kg/m The essential difference is the use for visual quality control of crucible smelting of new technological parameter, the height of the fluidized bed of molten slag and lead. Another difference is the use of formulas (1) to establish an acceptable height of the fluidized bed of molten slag and lead. The method is as follows. Of material laboratory test OTB is given the analytical sample, mix it with a design quantity of the mixture, the mixture is melted by a standard method. During melting visually control the characteristics of the fluidized bed of molten slag and lead. When choosing the right charge the molten slag and lead boils rapidly, the maximum height of the fluidized bed corresponds to the design condition (1). When the deviation of the height of the fluidized bed of molten slag and lead from the allowed value decreases the degree of extraction of precious metals in lead alloy. In this case, adjust the composition of the charge and perform sample analysis again. The invention is illustrated by the following examples. Example 1. Analyzing a control sample of quartz ore, containing finely dispersed gold in the amount of 15 g/so Selected analytical sample mass 50 g and mix it with the mixture composition, g: lead oxide - 80, soda ash fused - 35, dehydrated borax - 15, starch and 2.5. Spend crucible melting the mixture of the sample and the charge in the crucible PT-3. During melting visually estimate the height of the layer of the melt, which is equal to 8·10-2m In the melting receive lead alloy mass of 32.5 g and slag mass 95, Lead alloy is light, easily separated from the slag. Slag homogeneous core. Calculate the maximum height hatslacha layer by the formula (1), receive 1,6·10-1m ≥Nwith≥1·10-1m Affairs shall have the conclusion of the what height hatslacha melt is outside the range of allowable values. Therefore, gold is not fully extracted from the molten slag in the lead alloy. Sample analysis should be repeated. Next, determine the gold content in the lead alloy and calculate the gold content in the sample. Estimated gold content of the sample is 13.5 g/T. the Degree of extraction of gold in the smelting process - 90%. Thus, the result of the analysis of a control sample confirms the conclusion made on the basis of visual monitoring of the heat. Example 2. Analyze the same control sample. Selected analytical sample mass 50 g and mixed with the charge stock, g: lead oxide - 80, soda ash - 35, borax - 15, starch and 2.5. Spend crucible melting the mixture of the sample and the charge in the crucible PT-3. During melting visually estimate the height hatslacha layer, which is 1.2·10-1m In the melting receive a lead alloy with a mass of 32.0 g and slag mass 89, Lead alloy is light, easily separated from the slag. Slag homogeneous core. Calculate the maximum height hatslacha layer by the formula (1) and conclude that the height hatslacha melt does not extend beyond the interval of acceptable values, as 1,6·10-1m ≥Nwith>0,9·10-1m Therefore, the quality of operation of Tegelen what I'm melting" high. Next, determine the gold content in the lead alloy and calculate the gold content in the sample - 15.0 g/t (the degree of extraction of gold in the smelting process - 100%). Thus, the result of the analysis of a control sample confirms the conclusion made on the basis of visual monitoring of the heat. Example 3. Analyze the same control sample. Selected analytical sample mass 50 g and mixed with the charge stock, g: lead oxide - 50, soda ash - 60, borax - 20, starch - 3. Spend crucible melting the mixture of the sample and the charge in the crucible PT-3. During melting visually estimate the height hatslacha layer. Note that the height hatslacha layer exceeded the depth of the crucible, 1.8·10-1m and part of the melt has flowed out from the crucible. Therefore, gold is not fully extracted from the molten slag in the lead alloy and the sample analysis should be repeated, pre-adjust the composition of the charge. Next, determine the gold content in the lead alloy and calculate the gold content in the sample - 14.2 g/t (the degree of extraction of gold in the smelting process - 94,7%). Thus, the result of the analysis of a control sample confirms the conclusion made on the basis of visual monitoring of the heat. According to the experimental verification of the proposed method in comparison with the prototype provides a higher reliability of results VI the issue of quality control operations assay analysis crucible melting. Sources of information: 1. Shvetsov V., Pakhomov CENTURIES, Chichewa V.P. Journal of analytical chemistry. T.XLIV. Issue 6. 1988. S-1068. 2. Baryshnikov IVAN, Popova N.A., Orobinskaya VA Probootborniki and analysis of noble metals. M.: metallurgy, 1978, p.123-125. Method of quality control assay crucible for melting determination of noble metals in mineral raw materials, including smelting of the charge with the extraction of precious metals in lead alloy and visual inspection of the color obtained lead alloy and otdelimosti it from slag, homogeneity and degree of acidity of the slag, wherein the quality control visually the height of the fluidized bed of molten slag and lead to a valid value which is calculated by the formula
where Hm- the depth of the crucible, m; Hc- the height of the fluidized bed of molten slag and lead, m; α - the angle at the vertex of the cone inner surface of the crucible, C; MW, Mc- the mass of the slag and weight of the lead, respectively, kg; ρWthat ρwiththe density of the slag and the density of lead, respectively, kg/m3.
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