54 results about "Gold content" patented technology

The invention provides a gold ore phase analysis method, and belongs to the field of mineral analys.The gold ore phase analysis method comprises the steps that a gold ore sample is prepared into ore pulp, the pH value is adjusted to 10-11, ultrasonic cavitation treatment is conducted after polyethylene glycol is added, and limonite turbid liquid and sedimentation bottom mud are obtained through separation; the turbid liquid is subjected to flocculation precipitation, drying, roasting, acid dissolution and impurity removal, and the limonite gold-loaded grade is obtained through the mass difference before and after dissolution and gold concentration determination; separating metal sulfide ore heavy minerals and gangue minerals from the settled bottom mud through artificial heavy elutriation, performing acid dissolution and impurity removal on the metal sulfide heavy minerals, and calculating the gold loading grade of the metal sulfide heavy minerals through mass difference and gold concentration determination; after gangue minerals are subjected to oxidizing roasting, the gold content is measured after concentrated acid dissolution; and calculating the distribution rate of gold based on the result. The gold loading grade and distribution of the limonite phase, the metal sulfide ore phase and the gangue mineral phase are measured in a split-phase mode, the method is highly matched with the gold ore development process, operation is easy and convenient, the result is reliable, and beneficiation and metallurgy technological process formulation and technical index pre-judgment can be effectively served.

The invention discloses an ore gold content detection method and system based on big data, and belongs to the technical field of ore gold content detection.The method comprises the steps that to-be-detected ore is pretreated, a to-be-detected sample solution is obtained, working parameters of an inductively coupled plasma mass spectrometer are initially set, the to-be-detected sample solution is ionized, and the to-be-detected sample solution is obtained; and monitoring the plasma state in real time, completing self-adaptive adjustment of working parameters of the inductively coupled plasma mass spectrometer, accelerating ions to enter the mass spectrometer through an electric field after ionization treatment is completed, completing quantitative analysis of the gold content of a to-be-detected sample solution, and outputting a detection result. According to the invention, the self-adaptive adjustment of the working parameters of the instrument is realized, the problem of gold ionization efficiency difference caused by unstable plasma state is solved, the accuracy and reliability of the detection result are improved, and the efficiency and accuracy of the whole detection process are improved by monitoring the pretreatment process of the to-be-detected ore and judging the dissolution completeness.

The invention provides a method for measuring gold distribution in high-carbon ore, and relates to the technical field of mineral processing and mineral content measurement, and the method comprises the following steps: 1) preparing an experimental sample; 2) preparing an electronic probe sample and an MLA sample; (3) quantitatively analyzing the types of the carbon minerals and the content of carbon in the minerals by using an electronic probe; (4) measuring the content of carbonate minerals and the content of other minerals through MLA qualitative analysis; (5) determining the content of monomers and continuous gold; 6) determining the gold content in the carbonate mineral; (7) determining the gold content in the metal mineral; and 8) determining the content of gold in silicate neutralized organic carbon. The determination method is simple, convenient to operate and short in time consumption, and a basis can be quickly provided for selection of a mineral separation process method and flow. The measurement method is based on calculation of the raw ore grade, errors caused by different treatment slag grades in all intermediate processes are avoided, secondary correction of mineral content data can be carried out in the measurement process, and the precision and accuracy are remarkably improved.

The invention discloses a processing analysis method for a coarse grain-containing gold ore sample. The processing analysis method comprises the following steps: step 1, crushing, screening, uniformly mixing and splitting the coarse grain-containing gold ore sample; 2, fine crushing and heavy sand separation are conducted, and a heavy sand sample and a light mineral sample are obtained; 3, the heavy sand sample is subjected to wet digestion analysis, and the gold content is measured; 4, processing the light mineral sample, and determining the gold content; and 5, calculating the gold content of the coarse-grain gold ore sample. According to the method, natural gold is separated and enriched from the sample through heavy sand separation, the situation that large-particle-size natural gold is difficult to disperse uniformly in the machining process is avoided, the precision and accuracy of the gold content detection result are improved, then the heavy sand sample is subjected to wet digestion analysis, the roasting process is removed, the natural gold loss risk is reduced, and the detection accuracy is improved. Finally, the weighted average value of the gold content of the heavy sand sample and the light mineral sample is used as the gold content of the coarse-grain-containing gold ore sample, the determination precision is improved, and the method is suitable for the technical field of mineral processing analysis.

The invention belongs to the technical field of metallurgy, and relates to a method for testing gold in crude antimony crystal salt, which comprises the following steps: S1, roasting the crude antimony crystal salt at 280-320 DEG C for the first time, then heating to 550-650 DEG C, and roasting for the second time; and S2, after roasting is finished, a composite flux and a silver nitrate solution are added, heat preservation melting is conducted for 10-15 min at the temperature of 1150-1200 DEG C, a lead buckle is obtained, then the lead buckle is subjected to soot blowing, and the gold content in the crude antimony crystal salt is obtained through measurement. According to the method, the influence of sodium sulfide sulfate, sodium sulfide and sodium antimonate on gold content testing is solved through oxidizing roasting pretreatment; and the iron powder, the nickel powder and other composite fluxing agents are added in the subsequent melting process, and the gold content testing accuracy is remarkably improved.

The invention relates to the technical field of gold piece recovery devices, in particular to a gold piece recovery method which is implemented through a gold piece recovery device, and the gold piece recovery device comprises a placement opening, a spectrum detection device, a weighing device and a control device; the gold piece recycling method comprises the following steps that needed operation information is input, specifically, the needed operation information is input into the control device, and the needed operation information comprises information for selecting only gold content detection and information for selecting gold recycling; a step of placing a treated object, specifically, enabling the treated object to pass through a placing opening to enter the gold piece recovery device; and detecting the processed object, specifically, conveying the processed object to a spectrum detection device, performing spectrum detection on the processed object to obtain gold content information of the processed object, and conveying the processed object to a weighing device for weighing to obtain weight information of the processed object. The gold piece recycling device can achieve automatic recycling of gold pieces.

This invention relates to a gold-sand porcelain, comprising a ceramic body, characterized by further including a carved layer disposed on the surface of the ceramic body. The ceramic body comprises, by weight, the following components: 35-50 parts mineral clay, 25-35 parts hydromica, 2-6 parts kaolin, 10-20 parts quartz, 5-10 parts mica, 1-6 parts silicon dioxide, 2-5 parts iron oxide, 1-3 parts aluminum oxide, 2-6 parts calcium oxide, 2-5 parts magnesium oxide, 5-10 parts manganese oxide, 1-6 parts potassium oxide, 2-5 parts sodium oxide, and 2-6 parts zinc oxide. The carved layer is decorated according to a desired pattern. The gold-sand porcelain of this invention is characterized by being made of clay with a high gold content, being unglazed, having good breathability, good thermal shock resistance, preserving the original flavor of food, and optimizing and activating beneficial bacteria.

The application discloses a kind of heat insulation films and preparation methods thereof.The heat insulation film includes substrate layer, hard coating layer, first dielectric layer, first barrier layer, noble metal layer, second barrier layer, second dielectric layer and adhesive layer from inside to outside.The first dielectric layer is aluminum-doped zinc oxide, the noble metal layer is a silver-gold alloy layer with controllable thickness, and has a gradient distribution of gold content in the thickness direction;The second dielectric layer is formed into a layered composite structure by alternately stacking titanium dioxide and hafnium oxide.The preparation method includes substrate cleaning and surface activation, hard coating layer coating and curing, magnetron sputtering of dielectric layer and barrier layer, alloying deposition of noble metal layer, alternating sputtering of layered composite dielectric, and adhesive layer coating and compounding.The application realizes excellent infrared barrier performance while maintaining high visible light transmittance through the synergistic design of multi-layer structure and components, significantly improves the stability in a humid and hot environment, and reduces the risk of performance degradation.

The invention provides an electroplating method, and relates to the technical field of electroplating. Comprising the following steps: electroplating a pretreated pre-plated part in an environment with the nickel ion content of 80-110 g / L, the nickel chloride concentration of 8-20 g / L, the boric acid concentration of 35-45 g / L, the pH value of 3.8-4.5 and the specific gravity of 28-35 and a gold plating reagent with the gold content of 3-5 g / L, the cobalt content of 0.3-1 g / L, the pH value of 4-4.6 and the specific gravity of 10-16 at the environment temperature of 50-60 DEG C to obtain an electroplated part with a gold plating layer; and sequentially washing and drying the electroplated part to obtain an electroplated finished product. Due to the fact that the matte nickel plating layer has good abrasion resistance, friction and abrasion can be better resisted, the service life of the product is prolonged, and corrosion resistance is enhanced.

The invention relates to the field of semiconductor packaging materials, in particular to a high gold bonding alloy wire and a production process and application thereof, and the production process comprises the following steps: smelting and quickly solidifying raw materials with the purity being greater than or equal to 99.999% to prepare a gold alloy ingot with the gold content being greater than or equal to 99.99%; carrying out hot working and multi-pass cold drawing on the gold alloy cast ingot, and carrying out intermediate annealing during cold drawing to obtain an intermediate wire with the diameter of 50-200 microns; plastic twisting deformation is applied to the middle wire, and the twisting deformation degree ranges from 30 circles per meter to 120 circles per meter; the intermediate wire subjected to twisting deformation is subjected to rapid heat treatment, the heat treatment temperature ranges from 350 DEG C to 550 DEG C, the heat treatment time ranges from 2 s to 8 s, and then rapid cooling is conducted; and precisely drawing the wire material subjected to heat treatment to obtain a final finished product with the diameter of 15-33 microns. Through coordination of the components and the process, the problem of sliding balls or pseudo soldering defects is solved, and a high-strength and low-radian product is obtained.

The invention discloses a gold bonding wire and a preparation method and application thereof. The gold bonding wire comprises, by mass, 75%-85% of gold, 8.5%-10.2% of palladium, 0.08%-0.15% of yttrium, 0.02%-0.02% of erbium, 0.003%-0.01% of cerium and the balance silver and inevitable impurities. According to the invention, through component synergy and combination of a graded heat treatment-multi-section pulse ultrasonic wire drawing-precise annealing process, the problem of synchronous improvement of strength and toughness under gold content reduction is effectively solved. Palladium provides solution strengthening, rare earth elements synergistically refine grains, purify grain boundaries and perform precipitation strengthening, and the performance loss caused by gold reduction is made up. Precipitation and structure uniformity are regulated and controlled through graded heat treatment, work hardening is remarkably reduced through multi-section gradient power ultrasonic wiredrawing, high-toughness deformation is guaranteed, and the structure is accurately annealed and stabilized.

The application discloses a method for determining the gold-carrying amount of brown iron ore in heavy floatation tailings, which comprises the following steps: mixing the tailing sample with a composite reducing agent composed of flour, activated carbon, anhydrous sodium carbonate and ammonium sulfate; performing closed reduction roasting by subsection heating, constructing a loose porous structure and converting the gangue phase by the pore-forming effect of the ammonium sulfate and the fluxing modification of the sodium carbonate; obtaining the magnetic product by grinding and ultrasonic-assisted magnetic separation, and then performing oxidation roasting and acid dissolution treatment, removing the modified gangue by mass difference subtraction, calculating the net mass of the brown iron ore, and combining with the liquid phase gold content determination to obtain the gold-carrying amount; and the application effectively solves the problems of serious micro-fine particle brown iron ore wrapping, easy roasting and large gangue interference, and realizes the accurate determination of the gold-carrying amount.

Embodiments of the present application provide an electroplating solution for a gold-silver alloy and a use thereof. The electroplating solution comprises a gold ion source, a silver ion source, a first complexing agent, and a second complexing agent, wherein the first complexing agent comprises a hydantoin-based substance, and the second complexing agent comprises an organic sulfonic acid or a salt thereof. By means of a synergistic effect of the two types of complexing agents, the electroplating solution exhibits relatively high stability and can specifically inhibit electrodeposition of silver without affecting deposition of gold, thereby reducing the influence of current density fluctuations on the gold content in an alloy coating. Thus, an alloy coating having a gold content stably maintained within a range of 30-50 wt% can be produced over a relatively wide current density range having an interval width of at least 0.3 ASD.

The present invention relates to the technical field of element content detection, and in particular to a method for determining the gold content and other element contents in a gold alloy product. The method comprises the following steps: 1) dissolving a sample, adding hydrochloric acid, disodium ethylenediaminetetraacetic acid, tartaric acid, oxalic acid, and perchloric acid to prepare a stable sample solution; 2) preparing a calibration solution composed of the main element contents; 3) measuring calibration samples of gold, silver, copper, zinc, nickel, iron, manganese, and chromium with known concentrations to determine the test conditions for the above elements; and 4) testing the calibration solution samples to construct a calibration working curve showing the relationship between X-ray fluorescence spectrum intensity and the gold, silver, copper, zinc, nickel, iron, manganese, and chromium content. The calibration curve is then used to test the sample to determine the gold, silver, copper, zinc, nickel, iron, manganese, and chromium contents in the gold alloy product to be tested. This method can quickly and accurately determine the gold, silver, copper, zinc, nickel, iron, manganese, and chromium contents in gold alloy products with a gold content of 0.15% to 99.9%.

The filtering device for the gold cyanide-containing waste gold plating solution electrolytic recovery device comprises a gold cyanide-containing waste gold plating solution conveying pipe, a net-shaped filtering module part is arranged on the gold cyanide-containing waste gold plating solution conveying pipe, and an ultrafiltration module is arranged corresponding to the net-shaped filtering module; the net-shaped filtering module part comprises an activated carbon filtering body and a granular impurity filtering body, activated carbon is arranged in the activated carbon filtering body and used for adsorbing organic pollutants, and an organic pollution pretreatment-free structure is formed; the ultrafiltration module comprises an ultrafiltration part main body, ultrafiltration part filtering holes are uniformly formed in the ultrafiltration part main body, a plurality of ultrafiltration grooves are further formed in the ultrafiltration part main body, and ultrafiltration membranes are arranged on the side edges and the bottoms of the ultrafiltration grooves; and the ultrafiltration membrane is used for coarsely filtering cyanide to form a gold content reducing interference type ultrafiltration execution structure.

The present application provides a method for separation-enrichment of gold, iron, and nickel in electronic waste and continuous determination of gold and nickel, belonging to the technical field of metal detection in electronic waste. The method comprises the following steps: electronic waste containing iron, nickel, and gold is mixed with a reagent, water is added for dissolution, and solid-liquid separation is performed to obtain a gold-containing solid and a filtrate; a diluent of a nickel chelate collector is added to the filtrate for extraction, the inorganic phase solution is separated, a reverse collector is added to the organic phase solution for back extraction, and the nickel content is detected; the pH value of the inorganic phase solution is adjusted to a predetermined range to achieve precipitation and purification of the iron; the gold-containing solid is dried, and the gold content is detected by fire assay. The present application achieves separation-enrichment of gold, iron, and nickel through front-end separation of iron and nickel, efficient capture of nickel, precipitation and purification of iron, and precise enrichment of gold, while taking into account the recycling of resources, ensuring the precise testing of subsequent gold content, and achieving the accuracy of gold element content testing in electronic waste.

This invention provides a method for measuring gold distribution in high-carbon ores, relating to the technical fields of mineral processing and mineral content measurement. The method comprises the following steps: 1) preparing experimental samples; 2) preparing electron probe and MLA samples; 3) quantitatively analyzing the carbon mineral types and carbon content within the minerals using electron probe analysis; 4) qualitatively analyzing the carbonate and other mineral contents using MLA analysis; 5) determining the gold content of the individual and associated gold; 6) determining the gold content in carbonate minerals; 7) determining the gold content in metallic minerals; and 8) determining the gold content in silicates and organic carbon. This method is simple, easy to operate, and time-efficient, rapidly providing a basis for selecting mineral processing methods and procedures. This measurement method is based on the calculation of the raw ore grade, avoiding errors caused by varying slag grades in various intermediate processes. It also allows for secondary correction of the mineral content data during the measurement process, significantly improving accuracy.

The invention provides a method for separation-enrichment of gold, iron and nickel in electronic waste and continuous determination of gold and nickel, and belongs to the technical field of metal detection in the electronic waste, the electronic waste containing iron, nickel and gold is mixed with an agent, water is added for dissolution, solid-liquid separation is performed, and a gold-containing solid and filtrate are obtained; a diluent of a nickel chelating collector is added into the filtrate for extraction, an inorganic phase solution is separated, a reverse collector is added into the organic phase solution for back extraction, and the content of nickel is detected; adjusting the pH value of the inorganic phase solution to a preset range to realize precipitation and purification of iron; and drying the gold-containing solid, and detecting the content of gold by adopting a fire assaying method. According to the method, through front-end separation of iron and nickel, efficient collection of nickel, precipitation and purification of iron and accurate enrichment of gold, separation-enrichment of gold, iron and nickel is achieved, meanwhile, recycling of resources is taken into account, subsequent accurate testing of the gold content is guaranteed, and the accuracy of testing of the gold element content in the electronic waste is achieved.

The invention discloses a method for obtaining a sodium antimonate product based on two-stage circulating leaching, which comprises the following steps: primary sulfuration leaching: adding a sulfurizing agent into an antimony-containing material I under an alkaline condition, and carrying out primary sulfuration leaching to obtain antimony leaching liquid I and antimony leaching slag I; the antimony-containing material II is mixed with the antimony leaching liquid I under the alkaline condition, double-stage leaching is conducted, and double-stage antimony leaching liquid and double-stage antimony leaching slag are obtained; a vulcanizing agent is added into the double-stage antimony leaching slag under the alkaline condition, circulating vulcanization leaching is carried out, antimony leaching slag II and antimony leaching liquid II are obtained, and the antimony leaching liquid II is returned to double-stage leaching for double-stage leaching; oxidation antimony precipitation: mixing the two-stage antimony leaching liquid with an oxidizing agent, and carrying out oxidation reaction to obtain a sodium antimonate product. According to the method, gold leaching can be effectively inhibited without adding a complex inhibitor, meanwhile, gold is enriched in the antimony leaching slag to be recycled, the gold recovery rate can reach 99.6% or above, and the gold content in the sodium antimonate product can be reduced to 0.5 g / t or below.

The invention discloses a preparation method and application of a gold-silver alloy quality control sample, and belongs to the technical field of precious metal analysis and detection. According to the method, a gold ore smelting product gold-silver alloy ingot serves as a basic mother ingot, and a series of gradient concentration quality control samples covering the gold content range of 5%-15% are prepared through the key processes of gradient design, nitrogen protection smelting, electromagnetic stirring, rapid cooling, annealing treatment, machining and the like. According to the method, uniformity evaluation, cooperative assignment, stability investigation and uncertainty evaluation are also performed, so that the matrix matching property, the magnitude reliability and the long-term stability of the sample are ensured. The prepared QCM is low in cost and high in practicability, is particularly suitable for solving the problem of system errors caused by matrix difference between commercially available standard substances and actual production products of mine enterprises in fire assaying analysis, and provides key technical support for quality control of gold ore smelting enterprises.

The invention relates to a fire assaying measurement method, in particular to a method for measuring gold content in a K gold ornament based on a fire assaying method, which comprises the following steps: step 1, weighing materials, and preparing a sample and a standard sample; 2, a fluxing agent and a catalyst are prepared, and the catalyst is used for increasing the reaction rate and reducing gold and silver residues in slag; 3, a fluxing agent, a catalyst and a cupel are pretreated, the inner surface of the cupel is thinly coated with the catalyst, the cupel is preheated, 10-15 wt% of borax is calcined at the same time, and the borax is dehydrated for use; step 4, filling a cupel; 5, soot blowing is conducted, specifically, the cupel filled with the lead buckles is placed in a soot blowing furnace, after the lead buckles are melted, a furnace door is slightly opened, the temperature is kept at 950 DEG C for 10-15 minutes, and after the furnace door is closed, the temperature is kept for 3-5 minutes; 6, separating gold; and step 7, calculating the content of K gold, and by thinly coating a catalyst in the cupel, in the soot blowing process, the silicone oil is boiled and decomposed and continuously penetrates through the melt from the surface of the cupel, so that the elemental gold and silver particles are far away from the slag.

This invention relates to the field of gold content analysis technology in ores, and more particularly to a method for analyzing gold content in ores. This method recovers large and fine free gold particles in stages, and achieves quantitative analysis of the total gold content through oxidation desulfurization and a dissolution-complexation reduction system. It also enables efficient refining and recovery of gold, achieving integrated analysis and recovery.

The invention relates to the technical field of precious metal materials, and discloses a preparation method of a high-hardness 1K gold composite material and application of the high-hardness 1K gold composite material in ornaments.The method comprises the steps that trace rare earth elements are added into a gold-copper-based master alloy melt, then manganese and boron are added, and the manganese and the boron are subjected to an in-situ reaction at the high temperature to generate a manganese boride hard reinforced phase; the rare earth element regulates and controls the in-situ reaction process and inhibits coarse agglomeration of a reinforced phase, so that the reinforced phase is fine and uniformly dispersed and distributed in a metal matrix. The hardness and wear resistance of the prepared composite material are far higher than those of traditional 1K gold, and the composite material has excellent polishing performance, high glossiness and vulcanization discoloration resistance. The material disclosed by the invention solves the problem that the traditional 1K gold ornament is soft and easy to damage, and the base body formula can enable the gold content of 1K gold to reach an appearance visual effect close to that of 18K gold, so that the material is particularly suitable for manufacturing ornaments with high wear resistance requirements, such as rings and bracelets.

The invention relates to the technical field of metal coating determination, and discloses an LA-ICP-MS. The LA-ICP-MS. The LA-ICP-MS. The LA-ICP-MS. The LA-ICP-MS. The LA-ICP-MS. The LA-ICP-MS. The LA-ICP-MS. The LA-ICP-MS. The LA-ICP- Step 2, performing laser ablation on the ablation area for multiple times, and generating corresponding sample aerosol in each ablation; step 3, carrying out denudation analysis on five gold standard samples with gradient gold contents, analyzing the contents of impurity elements in the plating layer through a standard curve method, summing the contents of the impurity elements, and then carrying out subtraction to calculate the gold content of the plating layer; and 4, when the Ag element content detected in the step 3 is exponentially increased for the first time compared with the Ag content analyzed after previous denudation and is larger than 0.1%, denudation is stopped, the denudation frequency is determined, and the coating thickness is calculated through a coating thickness measurement model. According to the testing method, accurate, efficient and micro-damage testing of the gold-plated and silver-plated ornament is realized.

Disclosed are a method for preparing a gold-silver alloy plating layer, a corresponding plating layer, and a product, belonging to the technical field of electroplating. The method for preparing a gold-silver alloy plating layer comprises the following steps: pretreating a workpiece to be electroplated, preparing a gold-silver electroplating solution, and setting an electroplating temperature; measuring and determining a low current density range and a high current density range, placing the workpiece to be electroplated into the electroplating solution, and controlling a current density to periodically switch between the low current density range and the high current density range; after obtaining a gold-silver plating layer having a predetermined gold-silver deposition amount, ending the electroplating; and annealing the gold-silver plating layer. The present invention eliminates the influence of slight current density fluctuations on gold content in the gold-silver alloy plating layer, thereby solving the technical problem, caused by photoresist openings, of random differences in gold content being present in a gold-silver alloy plating layer at different positions. By means of adjusting the duration of the high current density range and the low current density range time cycles to control the thickness of each plating layer, the gold content in the final plating layer can be accurately controlled.

The application discloses a kind of ore gold content detection method and system based on big data, belong to ore gold content detection technical field, including: to be detected ore is pretreated, obtain the sample solution to be detected, carry out inductively coupled plasma mass spectrometer working parameter initial setting, to be detected sample solution is ionized treatment, real-time monitoring plasma state, complete inductively coupled plasma mass spectrometer working parameter self-adaptive adjustment, after ionization treatment is completed, through electric field makes ion acceleration into mass spectrometer, completes the quantitative analysis of gold content of sample solution to be detected, and outputs detection result.The application realizes the self-adaptive adjustment of instrument working parameter, solves the problem of gold ionization efficiency difference caused by unstable plasma state, improves the accuracy and reliability of detection result, through the monitoring and dissolution completion judgment of the pretreatment process of to be detected ore, the efficiency and accuracy of entire detection process are improved.

The present application provides a method for measuring the gold content in gold concentrate, which belongs to the technical field of process mineralogy. The traditional measurement method mainly separates metals by subjecting the sample to acid treatment. Although this can remove silver, it cannot remove metals such as platinum and rhodium, which affects the accuracy. The present application determines the gold content in the gold concentrate by fire assay enrichment and automatic mineralogical analysis. Compared with the traditional measurement method, the present application does not require contact with dangerous drugs such as acids and alkalis, and can remove insoluble impurities and accurately measure the gold content in the gold concentrate. In addition, the test method provided by the present invention has simple operating steps; drying and measurement are carried out simultaneously, saving measurement time; combined with automatic mineralogical analysis, the measurement data is accurate, while saving workload, providing reliable data support for the efficient use of such resources.

The invention discloses a method for measuring trace gold in copper smelting slag flotation iron tailings, which comprises the following steps of: firstly, carrying out pretreatment including square magnetic boat pretreatment and sample pretreatment, and putting a sample into a square magnetic boat for staged heating; carrying out dissolution and suction filtration on the sample, and discarding filtrate; and heating the filter residue by using a clay crucible, preserving heat and cooling. And then performing pyrogenic assay enrichment, including the steps of melting, soot blowing, washing, gold separation, preparation of a gold solution and the like after proportioning the sample, and finally completing the determination of the gold content by an atomic absorption method. According to the method, the reducing power of the iron tailings is firstly removed, the influence of iron, flotation oil and sulfide is eliminated, enrichment is performed by adopting a pyrogenic process test, and a quantitative silver standard solution is added, so that gold is captured by silver, and the determination of trace gold in the copper smelting slag flotation iron tailings can be quickly and effectively completed; and the process cost is low, and the operation process is simple, flexible, rapid and accurate.

The present invention relates to a method for manufacturing a metal element of a piece of jewelry or a timepiece, the method comprising the steps of: (a) shaping and agglomerating a solid composition comprising a metal powder and optionally an organic binder, the metal powder consisting of particles of an alloy selected from the group consisting of the following alloys: * gold alloys containing at least 583 wt‰ gold; * silver alloys containing at least 750 wt‰ silver; * platinum alloys containing at least 850 wt‰ platinum; shaping the mixture, forming an agglomerate of metal particles; (b) forming a metal element by sintering the agglomerate of metal particles on a support at a sintering temperature Tfri, the support having a coefficient of thermal expansion ΔV1, the agglomerate of metal particles having a coefficient of thermal expansion ΔV2, where 0.5*|ΔV2| ≤ |ΔV1| ≤ 1.5*|ΔV2| over a temperature range between * Tfri-200°C and Tfri for gold or silver alloys; * Tfri-400°C and Tfri for platinum alloys, the support and the agglomerate of metal particles being made of different materials.

The present application relates to the technical field of chemical detection, and particularly relates to a method for measuring the quality and content of plastic-wrapped gold products, comprising the following steps: S1, placing the plastic-wrapped gold product to be detected into DMF, heating to above 150 DEG C, heating for 10-15 min, taking out, tearing off the surface plastic wrapping, and obtaining a gold product containing gum; S2, performing oxidation cupellation treatment on the gold product containing gum to remove the surface gum part, and obtaining a treated gold product; S3, weighing the gold mass in the treated gold product, and detecting the gold content in the treated gold product by using fire assaying method. The present application can effectively remove various types of plastic wrapping materials and gum through the combined application of DMF preliminary treatment, composite sol agent pretreatment, multi-stage oxidation cupellation and fire assaying method, while maximizing the protection of the gold product itself, and significantly improving the efficiency and precision of the quality and content measurement of the plastic-wrapped gold product.