Measurement method for gold ore article position above medium fraction in heavy sand and application of measurement method

Abstract

The invention provides a method for measuring the object positions of gold ores above the medium fraction in heavy sand and application of the method, and belongs to the field of mineral processing.The method for measuring the object positions of the gold ores above the medium fraction in the heavy sand comprises the following steps that gold ores above the medium fraction in a heavy sand sample to be measured are selected, and the length, width and thickness of each gold ore are measured; calculating the observation volume of each gold mineral; a volume correction coefficient and color are introduced to calculate the mass of each gold mineral; and calculating the grade of the gold minerals above the medium grade. According to the method, the observed volume of the gold mineral is corrected by introducing the volume correction coefficient, so that the real volume closer to the reality is obtained, the density of the gold mineral is corrected through color formation, so that the real density closer to the reality is obtained, and the mass of the gold mineral obtained through volume and density calculation is more accurate; therefore, the calculated grade is more accurate.

Description

Technical Field

[0001] The invention relates to the technical field of mineral processing, and in particular to a method for measuring the level of gold ore above medium particle size in heavy sand and an application thereof. Background Art

[0002] Ore dressing is to separate useful minerals from gangue minerals according to the physical and chemical properties of different minerals in the ore, and to separate various symbiotic (associated) useful minerals from each other as much as possible. The data obtained from the ore dressing test is the main basis for ore deposit evaluation and plant design. The measurement of the grade of minerals above the medium particle size in heavy sand can guide the ore dressing process.

[0003] At present, fire assay is internationally recognized as an important means of enriching precious metals such as gold and silver. It is widely used in the determination of geological samples, gold ores, gold concentrates and various gold-containing materials. With the advancement of science and technology, the precision and accuracy of fire assay for determining gold and silver are also constantly improving, and now it is in an irreplaceable position. Fire assay refers to the method of determining the content of precious metals in minerals and metal products by melting and roasting. With the high requirements for the environment and human health, the determination of gold and silver by fire assay also faces challenges. For example, when separating gold and silver, hot dilute nitric acid is used to treat samples containing gold and silver. Hot dilute nitric acid will harm the environment and human health. Summary of the invention

[0004] In view of the technical problems existing in the background technology, the present application provides a method for measuring the level of gold ores above the medium particle size in heavy sand and its application, aiming to solve the technical problem that nitric acid used in the detection process of fire assay method harms the environment and human health.

[0005] In a first aspect, an embodiment of the present application provides a method for measuring the level of gold minerals above the medium particle size in heavy sand, comprising the following steps: S1. Select gold minerals with medium grain size or above in the heavy sand sample to be tested, measure the length, width and thickness of each gold mineral, and calculate the observed volume of each gold mineral according to the following formula; V i =A i ×B i ×C i ; Where i is the number of gold minerals above the medium particle size in the heavy sand sample to be tested, i=1, 2, 3....; V i is the observed volume of the ith gold mineral; A i is the length of the i-th gold mineral; B i is the width of the ith gold mineral; C i is the thickness of the i-th gold mineral; S2. Calculate the mass of each gold mineral according to the following formula; M i=K×V i ×X×P; Where M i is the mass of the i-th gold mineral; K is the volume correction factor; P is the theoretical density of gold, which is 19.32 g / cm 3 ; X is the color of the gold mineral; S3. Calculate the grade of gold minerals above the medium particle size according to the following formula; α=(M1+M2+....M i ) / m; Where α is the grade of gold minerals above the medium particle size; m is the mass of the heavy sand sample to be tested.

[0006] In the technical solution of the embodiment of the present application, the grade of the mineral is measured according to the physical principle of multiplying volume and density. First, the gold minerals with medium grain size or above in the heavy sand sample to be measured are selected, and the length, width and thickness of each gold mineral are measured to calculate the observed volume; then the mass of each gold mineral is calculated according to the physical principle of mass = volume × density. In the specific calculation process, the volume correction coefficient is introduced to correct the observed volume of the gold mineral, so as to eliminate the volume deviation caused by the irregular shape of the gold mineral to the greatest extent, and the true density that is closer to the actual is obtained by using the fineness calculation. On this basis, the mass of the gold mineral calculated using the volume and density that are closer to the actual is more accurate, so that the calculated grade is more accurate.

[0007] In some embodiments, in step S2, the volume correction coefficient is measured by: selecting n gold minerals, smelting them into n regular rectangular parallelepiped structures respectively, measuring the length, width and thickness of each rectangular parallelepiped structure, and calculating the molten volume; and calculating the volume correction coefficient according to the following formula: K=(V 01 ′ / V 01 +V 02 ′ / V 02 +....V 0n ′ / V 0n ) / n; Where V 0n ′ is the melting volume of the nth gold mineral; V 0n is the observed volume of the nth gold mineral; n≤i.

[0008] In this embodiment, n gold minerals are selected and smelted into a regular rectangular structure, and the regular rectangular structure is used to measure the length, width, and thickness more accurately, thereby obtaining a more precise molten volume. A volume correction coefficient is obtained based on the deviation between the observed volume and the molten volume, thereby minimizing the difference between the observed volume and the actual volume of the gold mineral due to the irregular shape, thereby obtaining a volume closer to the actual volume, thereby improving the accuracy of the detection result.

[0009] In some embodiments, the selection is to divide the i gold minerals into several groups according to the particle size, and then select at least one from each group.

[0010] In this embodiment, gold minerals are grouped according to their particle morphology and gold minerals are selected from different groups, so that the gold mineral sampling is more representative, and the calculation result of the volume correction coefficient is more accurate, thereby improving the accuracy of the gold mineral grade calculation result.

[0011] In some embodiments, the smelting method is to place the gold mineral into a rectangular mold and place the mold in a muffle furnace for high-temperature melting.

[0012] In this embodiment, a high-temperature melting method is used to smelt gold ore, and no reagents need to be added during the process, which is environmentally friendly.

[0013] In some embodiments, in the formula of step S2, X is the detected color X corresponding to the i-th gold mineral. i , or X is the average color of gold minerals X′; X′=(X1+X2+....X j ) / j; j≤i.

[0014] In this embodiment, the density of the gold mineral is corrected by the detected color corresponding to each gold mineral or the average color of the gold mineral, thereby improving the accuracy of the calculation.

[0015] In some embodiments, the color formation is detected using SEM or electron probe.

[0016] In this embodiment, the color of different gold minerals is detected by SEM or electron probe. The detection method is simple and convenient, and the detection accuracy is relatively high.

[0017] In some embodiments, in step S1, the selection is to screen out gold minerals having a width greater than or equal to a preset value under a stereo microscope; the preset value is 0.037 mm.

[0018] In some embodiments, the mass of the heavy sand sample to be measured is 4-10 kg.

[0019] In some embodiments, in step S1, before selection, the heavy sand sample to be tested is divided into several samples to be tested, each of which has a mass of 0.8-1.2 kg, and is mixed after manual heavy panning.

[0020] In this embodiment, by dividing the heavy sand sample to be tested into several parts, a smaller sample mass is convenient for manual re-panning, and impurities are more easily removed with a higher impurity removal rate; and mixing after re-panning makes the composition of the sample to be tested more uniform.

[0021] In a second aspect, an embodiment of the present application provides an application of the method for measuring the grade of gold ore above the medium particle size in heavy sand provided in the first aspect of the present application in mineral processing.

[0022] In the technical solution of the embodiment of the present application, the grade of gold minerals in medium and above particle sizes in heavy sand provided by the present application is accurately calculated to provide more accurate data support for mineral processing, which has high-value guiding significance.

[0023] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings used in the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 This is a flow chart of the method for measuring the level of gold minerals above the medium particle size in heavy sand provided in the embodiments of the present application. DETAILED DESCRIPTION

[0026] The following embodiments of the technical solution of the present application will be described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0028] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0029] In the description of the embodiments of the present application, the term "several" refers to more than two (including two).

[0030] The measurement of the mineral grade above the medium particle size in heavy sand can guide the mineral processing process. The fire assay method, which is currently recognized as a chemical method with high accuracy for heavy metal detection, uses nitric acid that harms the environment and human health during the detection process.

[0031] In order to solve the technical problem that nitric acid used in the fire assay method harms the environment and human health, the present application provides a method for measuring the grade of gold ores above the medium particle size in heavy sand and its application, wherein the observed volume of the gold mineral is corrected by introducing a volume correction coefficient, thereby obtaining a true volume that is closer to the actual volume, and the density of the gold mineral is corrected by color, thereby obtaining a true density that is closer to the actual density. On this basis, the mass of the gold mineral calculated using the volume and density that are closer to the actual is more accurate, thereby making the calculated grade more accurate. This method is used to measure the grade of gold ores above the medium particle size in heavy sand, with a simple process, fast calculation, accurate data, satisfactory results, and determining the grade of gold minerals above the medium particle size has important guiding significance for the flotation process of gold.

[0032] Please refer to Figure 1 In a first aspect, the present application provides a method for measuring the level of gold minerals above the medium particle size in heavy sand, comprising the following steps: S1. Select gold minerals with medium grain size or above in the heavy sand sample to be tested, measure the length, width and thickness of each gold mineral, and calculate the observed volume of each gold mineral according to the following formula; V i =A i ×B i ×C i ; Where i is the number of gold minerals above the medium particle size in the heavy sand sample to be tested, i=1, 2, 3....; V i is the observed volume of the ith gold mineral; A i is the length of the i-th gold mineral; B i is the width of the ith gold mineral; C i is the thickness of the i-th gold mineral; S2. Calculate the mass of each gold mineral according to the following formula; M i =K×V i ×X×P; Where M i is the mass of the i-th gold mineral; K is the volume correction factor; P is the theoretical density of gold, which is 19.32 g / cm 3 ; X is the color of the gold mineral; S3. Calculate the grade of gold minerals above the medium particle size according to the following formula; α=(M1+M2+....M i ) / m; Where α is the grade of gold minerals above the medium particle size; m is the mass of the heavy sand sample to be tested.

[0033] In the technical solution of the embodiment of the present application, the mineral grade is measured according to the physical principle of multiplying volume and density. First, the gold minerals above the medium particle size in the heavy sand sample to be measured, i.e., the target gold minerals, are selected, and the length, width, and thickness of each gold mineral are measured to calculate the observed volume; then, the mass of each gold mineral is calculated according to the physical principle of mass = volume × density. In the specific calculation process, on the one hand, a volume correction coefficient is introduced to correct the observed volume of the gold mineral. Since the volume of the gold mineral is irregular, the observed volume calculated by measuring its length, width, and thickness deviates from the actual volume. The observed volume of the gold mineral is corrected by the volume correction coefficient, thereby eliminating the volume deviation caused by the irregular shape of the gold mineral to the greatest extent. On the other hand, the density of the gold mineral is corrected by color. Since the gold mineral contains impurities, its actual density deviates from the theoretical density. The density of the gold mineral is corrected by color, thereby obtaining a real density that is closer to the actual density. On this basis, the mass of the gold mineral calculated using the volume and density that are closer to the actual is more accurate, thereby making the calculated grade more accurate.

[0034] Further, in some embodiments, in step S3, the volume correction coefficient is measured by: selecting n gold minerals, smelting them into n regular rectangular parallelepiped structures respectively, measuring the length, width and thickness of each rectangular parallelepiped structure, and calculating the molten volume; and calculating the volume correction coefficient according to the following formula; K=(V 01 ′ / V 01 +V 02 ′ / V 02 +....V 0n ′ / V 0n ) / n; Where V 0n ′ is the melting volume of the nth gold mineral; V 0n is the observed volume of the nth gold mineral; n≤i.

[0035] In the technical solution of the embodiment of the present application, firstly, n gold minerals are selected and smelted into a regular rectangular structure, and the regular rectangular structure is used to measure the length, width and thickness more accurately, so as to obtain a more precise molten volume; then, the volume correction coefficient is obtained by the deviation between the observed volume and the molten volume, so as to eliminate the difference between the observed volume and the actual volume caused by the irregular shape of the gold mineral to the greatest extent, so as to obtain a volume closer to the actual volume, thereby improving the accuracy of the detection result.

[0036] Furthermore, in some embodiments, the selection is to divide i gold minerals into several groups according to the particle width, and then select at least one from each group. Specifically, different numbers of gold minerals are selected according to the number of gold minerals in each group. When there are many gold minerals, the number of selected gold minerals can be increased. When i does not exceed 30, each gold mineral can be smelted, that is, n=i, to further improve the accuracy of the volume correction coefficient calculation. The selection process is carried out under a stereo microscope.

[0037] In the technical solution of the embodiment of the present application, gold minerals of similar size are divided into a group according to the particle size of the gold minerals, and gold minerals are selected from different groups, that is, the sizes of the selected gold minerals cover all ranges of gold minerals, thereby making the gold mineral sampling more representative; at the same time, the sampling number is set according to the different numbers of gold minerals in each group, so as to further improve the representativeness and rationality of the sampling, thereby making the calculation result of the volume correction coefficient more accurate, thereby improving the accuracy of the gold mineral grade calculation result.

[0038] Furthermore, in some embodiments, the smelting method is to place the gold mineral into a rectangular mold and place it in a muffle furnace for high-temperature melting.

[0039] In the technical scheme of the embodiment of the present application, the object to be smelted is the gold ore after artificial re-panning rather than the gold mud. Therefore, the high-temperature melting method is used to smelt the gold ore. No reagent is needed to be added during the process, no toxic gas is generated, and it is environmentally friendly. The smelting process of the raw material rich in high-impurity gold mud is: first add nitric acid to remove impurities, then add aqua regia to enrich, and then add sodium sulfite to reduce. The whole process is complicated and will release sulfur gas, which is very harmful to human health. The present application corrects the observed volume of the gold ore by the method of chemical smelting, and then measures the grade of the mineral according to the physical principle of multiplying volume and density, and improves the accuracy of the grade detection of the gold ore by combining physics and chemistry. Compared with the pure chemical method of fire assay, it is basically unnecessary to add chemical reagents when selecting a small amount of representative gold ore for smelting, which has little impact on the health of the operator, little pollution to the environment, and relatively low cost.

[0040] Further, in some embodiments, in the formula of step S2, X is the detected color X corresponding to the i-th gold mineral. i , or X is the average color of gold minerals X′; X′=(X1+X2+....X j ) / j; j≤i. Specifically, when i does not exceed 30, X can be the detected color X corresponding to the i-th gold mineral. i, it can also be the average color X′ of all gold minerals, that is, j=i; when i is greater than 30, X is the average color X′ of gold minerals. At this time, the average color X′ is representatively selected from j gold minerals among i gold minerals, and the average color X′ is calculated by detecting the colors of j gold minerals, that is, j<i.

[0041] In the technical solution of the embodiment of the present application, when i does not exceed 30, the density of the gold mineral can be corrected by the detected color or average color corresponding to each gold mineral, so that the accuracy of the detection result is relatively high. When i is greater than 30, the average color X' is calculated by selecting and detecting the detected colors of j gold minerals, which simplifies the detection procedure while ensuring the accuracy of the calculation result.

[0042] Furthermore, in some embodiments, the color detection in step S2 is performed using SEM or electron probe.

[0043] In the technical solution of the embodiment of the present application, the color of different gold minerals is detected by SEM or electron probe. The detection method is simple and convenient, and the detection accuracy is relatively high.

[0044] Furthermore, in some embodiments, in step S1, the selection is to screen out gold minerals having a width greater than or equal to a preset value under a stereo microscope, and the preset value is 0.037 mm.

[0045] In the technical solution of the embodiment of the present application, the gold mineral is magnified and selected using a stereo microscope, so that the selection process proceeds smoothly. By setting the preset value to 0.037 mm, not only the problem of selection difficulty caused by too small a preset value is avoided, but also the problem of gold loss in the gold mineral caused by too large a preset value, thereby wasting resources, is avoided.

[0046] Further, in some embodiments, the mass of the heavy sand sample to be measured is 4-10 kg.

[0047] In the technical solution of the embodiment of the present application, by reasonably setting the mass of the heavy sand sample to be tested, the sampling is made more representative while avoiding excessive sampling volume which makes the detection process more cumbersome, thereby making the detection result more instructive.

[0048] Furthermore, in some embodiments, in step S1, before selection, the heavy sand sample to be tested is divided into several samples to be tested, each of which has a mass of 0.8-1.2 kg, and is mixed after manual heavy panning.

[0049] In the technical solution of the embodiment of the present application, by dividing the heavy sand sample to be tested into several parts, the smaller sample mass is convenient for manual re-panning, and impurities are easier to remove with a higher impurity removal rate; mixing after re-panning makes the composition of the sample to be tested more uniform.

[0050] In a second aspect, an embodiment of the present application provides a method for measuring the grade of gold ore above the medium particle size in the above-mentioned heavy sand and its application in mineral processing.

[0051] In the technical solution of the embodiment of the present application, the grade of gold minerals in medium and above particle sizes in heavy sand provided by the present application is accurately calculated to provide more accurate data support for mineral processing, which has high-value guiding significance.

[0052] Some specific embodiments are listed below. It should be noted that the embodiments described below are exemplary and are only used to explain the present application, and should not be construed as limiting the present application. If specific techniques or conditions are not specified in the embodiments, the techniques or conditions described in the literature in this area or the product specifications are used. The reagents or instruments used without specifying the manufacturer are all conventional products that can be obtained commercially.

[0053] Example 1 This embodiment provides a method for measuring the level of gold ore above the medium particle size in heavy sand, taking a raw ore in Yunnan as a sample, comprising the following steps: S1. Calculate the observation volume: Mix the raw ore and take samples from different points. Weigh a total of 5kg of raw ore as the heavy sand sample to be tested. Mix the weighed heavy sand sample to be tested without agglomeration and divide it into 5 samples to be tested. Each sample to be tested is 1kg. They are manually re-panned and mixed.

[0054] Gold minerals of different particle sizes were screened in sequence under a stereo microscope, and medium-sized gold minerals with a width greater than or equal to 0.037 mm were selected.

[0055] The length, width and thickness of each gold mineral were measured under a stereo microscope and the i =A i ×B i ×C i Calculate the observed volume of each gold mineral, with the length, width and thickness in mm, i=14. V1=A1×B1×C1=0.121×0.057×0.03=0.00020691mm 3 ; V2=A2×B2×C2=0.09×0.068×0.03=0.0001836mm 3 ; V3=A3×B3×C3=0.286×0.063×0.03=0.00054054mm 3 ; V4=A4×B4×C4=0.067×0.043×0.03=0.00008643mm3 ; V5=A5×B5×C5=0.089×0.070×0.03=0.0001869mm 3 ; V6=A6×B6×C6=0.078×0.053×0.03=0.00012402mm 3 ; V7=A7×B7×C7=0.09×0.071×0.03=0.0001917mm 3 ; V8=A8×B8×C8=0.059×0.040×0.025=0.000059mm 3 ; V9=A9×B9×C9=0.221×0.241×0.03=0.00159783mm 3 ; V 10 =A 10 ×B 10 ×C 10 =0.208×0.192×0.04=0.00159744mm 3 ; V 11 =A 11 ×B 11 ×C 11 =0.233×0.202×0.04=0.00188264mm 3 ; V 12 =A 12 ×B 12 ×C 12 =0.147×0.144×0.03=0.00063504mm 3 ; V 13 =A 13 ×B 13 ×C 13 =0.207×0.125×0.03=0.00077625mm 3 ; V 14 =A 14 ×B 14 ×C 14 =0.138×0.078×0.03=0.00032292mm 3 .

[0056] S2. Calculation of quality (1) Use SEM or electron probe to detect the color of each gold mineral, where the model of SEM is FEI Quanta650 and the model of electron probe is Daolu 1720h.

[0057] Specifically, X1=962.7‰; X2=958.1‰; X3=966.6‰; X4=989.5‰; X5=971.1‰; X6=972.1‰; X7=993.9‰; X8=992.4‰; X9=977.7‰; X 10 =983.3‰;X 11 =962.2‰;X 12 =991.2‰;X 13 =975.2‰;X 14 =968.2‰; X′=(X1+X2+....X 14 ) / 14=976.0‰.

[0058] (2) In this embodiment, i=14, which is a relatively small value. Therefore, the 14 gold minerals are smelted separately, that is, n=i=14, and the 14 gold minerals are smelted into regular rectangular structures. Specifically, the 14 gold minerals are placed in rectangular molds respectively, and melted in a muffle furnace at a high temperature of 1350°C. After demolding, the length, width and thickness of each rectangular structure are measured to calculate the molten volume; and according to K=(V 01 ′ / V 01 + V 02 ′ / V 02 +....V 0n ′ / V 0n ) / n to calculate the volume correction factor. V in this step 01 、V 02 ,....V 014 Corresponding to V1, V2, ....V in step S1 respectively 14 The length and width of the rectangular mold are both 0.1mm, that is, the length of the melted gold particle = width = 0.1mm. V 01 ′=A 01 ′×B 01 ′×C 01 ′=0.1×0.1×0.01924=0.0001924mm 3 ; V 01 =V1=0.00020691mm 3 ; V 02 ′=A 02 ′×B 02 ′×C 02′=0.1×0.1×0.01801=0.0001801mm 3 ; V 02 =V2=0.0001836mm 3 ; V 03 ′=A 03 ′×B 03 ′×C 03 ′=0.1×0.1×0.05184=0.0005184mm 3 ; V 03 =V3=0.00054054mm 3 ; V 04 ′=A 04 ′×B 04 ′×C 04 ′=0.1×0.1×0.00725=0.0000725mm 3 ; V 04 =V4=0.00008643mm 3 ; V 05 ′=A 05 ′×B 05 ′×C 05 ′=0.1×0.1×0.01783=0.0001783mm 3 ; V 05 =V5=0.0001869mm 3 ; V 06 ′=A 06 ′×B 06 ′×C 06 ′=0.1×0.1×0.01352=0.0001352mm 3 ; V 06 =V6=0.00012402mm 3 ; V 07 ′=A 07 ′×B 07 ′×C 07 ′=0.1×0.1×0.02041=0.0002041mm 3 ; V 07 =V7=0.0001917mm 3 ; V 08′=A 08 ′×B 08 ′×C 08 ′=0.1×0.1×0.00627=0.0000627mm 3 ; V 08 =V8=0.000059mm 3 ; V 09 ′=A 09 ′×B 09 ′×C 09 ′=0.1×0.1×0.14288=0.0014288mm 3 ; V 09 =V9=0.00159783mm 3 ; V 010 ′=A 10 ′×B 10 ′×C 10 ′=0.1×0.1×0.16345=0.0016345mm 3 ; V 010 =V 10 =0.00159744mm 3 ; V 011 ′=A 11 ′×B 11 ′×C 11 ′=0.1×0.1×0.16801=0.0016801mm 3 ; V 011 =V 11 =0.00188264mm 3 ; V 012 ′=A 12 ′×B 12 ′×C 12 ′=0.1×0.1×0.06731=0.0006731mm 3 ; V 012 =V 12 =0.00063504mm 3 ; V 013 ′=A 13 ′×B 13 ′×C 13 ′=0.1×0.1×0.07553=0.0007553mm 3 ; V 013 =V 13 =0.00077625mm 3 ; V 014 ′=A 14 ′×B 14 ′×C 14 ′=0.1×0.1×0.02986=0.0002986mm 3 ; V 014 =V 14 =0.00032292mm 3 ; K=(V 01 ′ / V 01 + V 02 ′ / V 02 +........V 014 ′ / V 014 ) / 14=0.9748; (3) According to M i =K×V i ×X i ×P calculates the mass of each gold mineral; that is, the corresponding detected color of each gold mineral is used for calculation.

[0059] M1=K×V1×X1×P=0.9748×0.00020691mm 3 ×962.7‰×19.32g / cm 3 =3.75141×10 -6 g; Similarly, M2=K×V2×X2×P=3.31288×10 -6 g; M3=K×V3×X3×P=9.84005×10 -6 g; M4=K×V4×X4×P=1.61066×10 -6 g; M5=K×V5×X5×P=3.41819×10 -6 g; M6=K×V6×X6×P=2.27052×10 -6 g; M7=K×V7×X7×P=3.58829×10 -6 g; M8=K×V8×X8×P=1.10271×10 -6 g; M9=K×V9×X9×P=2.94211×10 -5 g; M 10 =K×V 10 ×X 10 ×P=2.95824×10 -5 g; M 11 =K×V 11 ×X 11 ×P=3.41158×10 -5 g; M 12 =K×V 12 ×X 12 ×P=1.18545×10 -5 g; M 13 =K×V 13 ×X 13 ×P=1.42567×10 -5 g; M 14 =K×V 14 ×X 14 ×P=5.8882×10 -6 g; S3. Calculate grade According to α=(M1+M2+....M i ) / m to calculate the grade of gold minerals above the medium particle size.

[0060] α=(M1+M2+....M 14 ) / 5kg=0.000154013g / 5kg=0.0308g / t.

[0061] Example 2 A method for measuring the level of gold ore above medium particle size in heavy sand, compared with embodiment 1, is different in that in step S2, according to M i =K×V i ×X′×P calculates the mass of each gold mineral; that is, the average fineness is used for calculation.

[0062] M1=K×V1×X′×P=0.9748×0.00020691mm 3 ×976.0‰×19.32g / cm 3 =3.80324×10 -6 g; Similarly, M2=K×V2×X′×P=3.37478×10 -6 g; M3=K×V3×X′×P=9.93574×10 -6 g; M4=K×V4×X′×P=1.58868×10 -6 g; M5=K×V5×X′×P=3.43544×10 -6 g; M6=K×V6×X′×P=2.27963×10 -6 g; M7=K×V7×X′×P=3.52366×10 -6 g; M8=K×V8×X′×P=1.08449×10 -6 g; M9=K×V9×X′×P=2.93699×10 -5 g; M 10 =K×V 10 ×X′×P=2.93628×10 -5 g; M 11 =K×V 11 ×X′×P=3.46051×10 -5 g; M 12 =K×V 12 ×X′×P=1.16728×10 -5 g; M 13 =K×V 13 ×X′×P=1.42684×10 -5 g; M 14 =K×V 14 ×X′×P=5.93564×10 -6 g; According to α=(M1+M2+....M i ) / m to calculate the grade of gold minerals above the medium particle size.

[0063] α=(M1+M2+....M 14 ) / 5kg=0.00015424g / 5kg=0.0308g / t.

[0064] Comparative Example 1 A method for measuring the grade of medium-sized gold ores in heavy sand, wherein 14 medium-sized gold ores with a width greater than or equal to 0.037 mm selected in Example 1 (the 14 medium-sized gold ores are smelted gold ores) are used to measure the gold grade by a fire assay method with a high degree of accuracy, comprising the following steps: S1. 14 medium-sized gold minerals are mixed, lead monoxide flux is added thereto, and the mixture is heated to 900° C. and melted for 30 minutes to melt the gold minerals and the flux.

[0065] In this process, lead monoxide is reduced to metallic lead, which sinks to the bottom of the container together with the precious metal, and after cooling, a metal pellet is obtained, which contains the precious metal and a large amount of metallic lead and other metal impurities. The metal pellet is separated from the powdered slag.

[0066] S2. Place the metal balls obtained in step S1 in a baking bowl made of bone ash (or unglazed porcelain), and then place the baking bowl in an oxidation furnace and heat it at 1100° C. for 20 minutes.

[0067] In this process, the lead and other metal impurities in the metal balls are oxidized and lead oxide and other metal oxide powder slag are generated, while gold and silver are not oxidized and remain in the state of metal balls. Take out the baking bowl, slowly cool it, separate the metal balls composed of gold and silver from the slag, wash it and dry it. Weigh the mass of the metal ball directly, or weigh the mass of the thin sheet sample made of the ball by hammering or rolling, which is the total mass of gold and silver, which is 1.034876g.

[0068] S3. Treat the sample obtained in step S2 with hot dilute nitric acid to dissolve the silver and obtain a pure gold sample. Wash and dry the pure gold sample and weigh it again to obtain a gold mass of 0.000151 g.

[0069] Gold grade α = 0.000151 g / 5 kg = 0.0302 g / t It can be seen from the data of Examples 1-2 and Comparative Example 1 that the grade of gold minerals obtained by using the corresponding detection color or average color of each gold mineral is basically the same, and is basically equal to the grade of gold minerals obtained by fire assay. This shows that the method for measuring the grade of gold ores above the medium particle size in heavy sand provided by the present application has a high accuracy and matches the recognized high-accuracy fire assay method for measuring the gold grade.

[0070] Comparative Example 2 A method for measuring the grade of gold ore above the medium particle size in heavy sand, compared with Example 1, is different in that, in the mass calculation process, no volume correction factor is introduced, that is, according to M i =V i ×X i ×P calculates the mass of each gold mineral; M1=V1×X1×P=0.00020691mm 3 ×962.7‰×19.32g / cm 3 =3.84839×10 -6 g; Similarly, M2=V2×X2×P=3.39853×10 -6 g; M3=V3×X3×P=1.00944×10 -5 g; M4=V4×X4×P=1.65229×10 -6 g; M5=V5×X5×P=3.50655×10 -6 g; M6=V6×X6×P=2.32922×10 -6 g; M7=V7×X7×P=3.68105×10 -6 g; M8=V8×X8×P=1.13122×10 -6 g; M9=V9×X9×P=3.01817×10 -5 g; M 10 =V 10 ×X 10 ×P=3.03471×10 -5 g; M 11 =V 11 ×X 11 ×P=3.49977×10 -5 g; M 12 =V 12 ×X 12 ×P=1.2161×10 -5 g; M 13 =V 13 ×X 13 ×P=1.46252×10 -5 g; M 14 =V 14 ×X 14 ×P=6.04042×10 -6 g; The gold grade obtained is α=(M1+M2+....M 14 ) / 5kg=0.000157995g / 5kg=0.0316g / t.

[0071] It can be seen from the data of Comparative Example 2 and Example 1 that when the volume correction coefficient is not used to correct the volume, the gold grade of the gold ore obtained in Comparative Example 2 deviates greatly from the results of Example 1 and Comparative Example 1.

[0072] Example 3 This embodiment provides a method for measuring the level of gold ore above the medium particle size in heavy sand, taking the raw ore of a certain gold mine as a sample, comprising the following steps: S1. Calculate the observation volume: Mix the raw ore and take samples from different points. Weigh a total of 10 kg of raw ore as the heavy sand sample to be tested. Mix the weighed heavy sand sample to be tested without lumps and divide it into 10 samples to be tested. Each sample to be tested is 1 kg. Mix them after manual heavy panning.

[0073] Gold minerals of different particle sizes were screened in sequence under a stereo microscope, and medium-sized gold minerals with a width greater than or equal to 0.037 mm were selected.

[0074] The length, width and thickness of each gold mineral were measured under a stereo microscope and the i =A i ×B i ×C i Calculate the observed volume of each gold mineral, with the length, width and thickness in mm, i=14. V1=A1×B1×C1=0.324×0.10×0.15=0.004860mm 3 ; V2=A2×B2×C2=0.146×0.098×0.15=0.0021462mm 3 ; V3=A3×B3×C3=0.498×0.065×0.16=0.0051792mm 3 ; V4=A4×B4×C4=0.262×0.137×0.10=0.0035894mm 3 ; V5=A5×B5×C5=0.27×0.122×0.08=0.0026352mm 3 ; V6=A6×B6×C6=0.132×0.130×0.06=0.0010296mm 3 ; V7=A7×B7×C7=0.152×0.119×0.06=0.00108528mm 3 ; V8=A8×B8×C8=0.305×0.159×0.06=0.0029097mm 3 ; V9=A9×B9×C9=0.134×0.082×0.04=0.00043952mm 3 ; V 10 =A 10 ×B 10 ×C 10 =0.169×0.089×0.07=0.00105287mm 3 ; V 11 =A 11 ×B 11 ×C 11 =0.291×0.081×0.08=0.00188568mm 3 ; V 12 =A 12 ×B 12 ×C 12 =0.19×0.131×0.06=0.0014934mm 3 ; V 13 =A 13 ×B 13 ×C 13 =0.103×0.065×0.04=0.0002678mm 3 ; V 14 =A 14 ×B 14 ×C 14 =0.082×0.053×0.03=0.00013038mm 3 .

[0075] S2. Calculate quality: (1) Use SEM or electron probe to detect the color of each gold mineral, where the model of SEM is FEI Quanta650 and the model of electron probe is Daolu 1720h.

[0076] Specifically, X1=879.0‰; X2=822.3‰; X3=851.5‰; X4=928.9‰; X5=907.9‰; X6=816.7‰; X7=804.6‰; X8=918.5‰; X9=874.5‰; X 10 =891.3‰;X 11 =827.6‰;X 12 =903.3‰;X13 =847.8‰;X 14 =850.4‰; X′=(X1+X2+....X 14 ) / 14=866.0‰.

[0077] (2) In this embodiment, i=14, which is a relatively small value. Therefore, the 14 gold minerals are smelted separately, that is, n=i=14, and the 14 gold minerals are smelted into regular rectangular structures. Specifically, the 14 gold minerals are placed in rectangular molds respectively, and melted in a muffle furnace at a high temperature of 1350°C. After demolding, the length, width and thickness of each rectangular structure are measured to calculate the molten volume; and according to K=(V 01 ′ / V 01 + V 02 ′ / V 02 +....V 0n ′ / V 0n ) / n to calculate the volume correction factor. V in this step 01 、V 02 ,....V 014 Corresponding to V1, V2, ....V in step S1 respectively 14 The length and width of the rectangular mold are both 0.1mm, that is, the length of the melted gold particle = width = 0.1mm. V 01 ′=A 01 ′×B 01 ′×C 01 ′=0.1×0.1×0.4734=0.004734mm 3 ; V 01 =V1=0.004860mm 3 ; V 02 ′=A 02 ′×B 02 ′×C 02 ′=0.1×0.1×0.2489=0.002489mm 3 ; V 02 =V2=0.002146mm 3 ; V 03 ′=A 03 ′×B 03 ′×C 03 ′=0.1×0.1×0.4337=0.004337mm 3 ; V 03 =V3=0.005179mm3 ; V 04 ′=A 04 ′×B 04 ′×C 04 ′=0.1×0.1×0.3045=0.003045mm 3 ; V 04 =V4=0.003589mm 3 ; V 05 ′=A 05 ′×B 05 ′×C 05 ′=0.1×0.1×0.3044=0.003044mm 3 ; V 05 =V5=0.002635mm 3 ; V 06 ′=A 06 ′×B 06 ′×C 06 ′=0.1×0.1×0.1481=0.001481mm 3 ; V 06 =V6=0.001030mm 3 ; V 07 ′=A 07 ′×B 07 ′×C 07 ′=0.1×0.1×0.1455=0.001455mm 3 ; V 07 =V7=0.001085mm 3 ; V 08 ′=A 08 ′×B 08 ′×C 08 ′=0.1×0.1×0.2688=0.002688mm 3 ; V 08 =V8=0.002910mm 3 ; V 09 ′=A 09 ′×B 09 ′×C 09 ′=0.1×0.1×0.0384=0.000384mm 3 ; V09 =V9=0.000440mm 3 ; V 10 ′=A 10 ′×B 10 ′×C 10 ′=0.1×0.1×0.1229=0.001229 mm 3 ; V 010 =V 10 =0.001053mm 3 ; V 11 ′=A 11 ′×B 11 ′×C 11 ′=0.1×0.1×0.1655=0.001655mm 3 ; V 011 =V 11 =0.001886mm 3 ; V 12 ′=A 12 ′×B 12 ′×C 12 ′=0.1×0.1×0.1147=0.001147mm 3 ; V 012 =V 12 =0.001493mm 3 ; V 13 ′=A 13 ′×B 13 ′×C 13 ′=0.1×0.1×0.0379=0.000379mm 3 ; V 013 =V 13 =0.000268mm 3 ; V 14 ′=A 14 ′×B 14 ′×C 14 ′=0.1×0.1×0.0243=0.000243mm 3 ; V 014 =V 14 =0.000130mm 3 ; K=(V 01 ′ / V 01+V 02 ′ / V 02 +....V 014 ′ / V 014 ) / 14=1.12; (3) According to M i =K×V i ×X i ×P calculates the mass of each gold mineral. Among them, M1=K×V1×X1×P=1.12×0.004860mm 3 ×879.0‰×19.32g / cm 3 =9.24379×10 -5 g; Similarly, M2=K×V2×X2×P=3.81879×10 -5 g; M3=K×V3×X3×P=9.54273×10 -5 g; M4=K×V4×X4×P=7.21466×10 -5 g; M5=K×V5×X5×P=5.17698×10 -5 g; M6=K×V6×X6×P=1.81952×10 -5 g; M7=K×V7×X7×P=1.8895×10 -5 g; M8=K×V8×X8×P=5.78299×10 -5 g; M9=K×V9×X9×P=8.31694×10 -6 g; M 10 =K×V 10 ×X 10 ×P=2.0306×10 -5 g; M 11 =K×V 11 ×X 11 ×P=3.37686×10 -5 g; M 12 =K×V 12 ×X 12 ×P=2.91899×10 -5 g; M 13 =K×V 13 ×X13 ×P=4.9128×10 -6 g; M 14 =K×V 14 ×X 14 ×P=2.39916×10 -6 g; S3. Calculate grade According to α=(M1+M2+....M i ) / m to calculate the grade of gold minerals above the medium particle size.

[0078] α=(M1+M2+....M 14 ) / 10kg=0.000543783g / 10kg=0.0544g / t.

[0079] Example 4 A method for measuring the level of gold ore above medium particle size in heavy sand, compared with embodiment 3, is different in that in step S2, according to M i =K×V i ×X′×P calculates the mass of each gold mineral; that is, the average fineness is used for calculation.

[0080] M1=K×V1×X′×P=1.12×0.004860mm 3 ×866.0‰×19.32g / cm 3 =9.10708×10 -5 g; Similarly, M2=K×V2×X′×P=4.02173×10 -5 g; M3=K×V3×X′×P=9.70523×10 -5 g; M4=K×V4×X′×P=6.72612×10 -5 g; M5=K×V5×X′×P=4.93806×10 -5 g; M6=K×V6×X′×P=1.92935×10 -5 g; M7=K×V7×X′×P=2.03369×10 -5 g; M8=K×V8×X′×P=5.45244×10 -5 g; M9=K×V9×X′×P=8.2361×10 -6 g; M10 =K×V 10 ×X′×P=1.97296×10 -5 g; M 11 =K×V 11 ×X′×P=3.53355×10 -5 g; M 12 =K×V 12 ×X′×P=2.79846×10 -5 g; M 13 =K×V 13 ×X′×P=5.01827×10 -6 g; M 14 =K×V 14 ×X′×P=2.44317×10 -6 g; According to α=(M1+M2+....M i ) / m to calculate the grade of gold minerals above the medium particle size.

[0081] α=(M1+M2+....M 14 ) / 10kg=0.000537884g / 10kg=0.0538g / t.

[0082] Comparative Example 3 A method for measuring the grade of gold ore above the medium particle size in heavy sand, compared with Example 3, is different in that, in the mass calculation process, no volume correction factor is introduced, that is, according to M i =V i ×X i ×P calculates the mass of each gold mineral; α=(M1+M2+....M 14 ) / 10kg=0.000485521g / 10kg=0.0486g / t.

[0083] It can be seen from the data of Examples 3-4 and Comparative Example 3 that when the volume correction coefficient is not used to correct the volume, the gold grade of the gold ore obtained in Comparative Example 3 deviates greatly from the result of Example 3.

[0084] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and the embodiments having the same structure as the technical idea and exerting the same effect within the scope of the technical solution of the present application are all included in the technical scope of the present application. In addition, without departing from the scope of the main purpose of the present application, various modifications that can be thought of by those skilled in the art to the embodiments and other methods of combining some of the constituent elements in the embodiments are also included in the scope of the present application.

Claims

1. A method for measuring the grade of gold minerals above medium particle size in heavy sand, characterized in that: The following steps are involved: S1. Select gold minerals with medium grain size or above in the heavy sand sample to be tested, measure the length, width and thickness of each of the gold minerals, and calculate the observed volume of each of the gold minerals according to the following formula; In i =A i ×B i ×C i ; Where, i is the number of gold minerals above the medium particle size in the heavy sand sample to be tested, i=1, 2, 3....; V i is the observed volume of the i-th gold mineral; A i is the length of the i-th gold mineral; B i is the width of the i-th gold mineral; C i is the thickness of the i-th gold mineral; S2. Calculate the mass of each of the gold minerals according to the following formula; M i =K×V i ×X×P; Where M i is the mass of the i-th gold mineral; K is the volume correction factor; P is the theoretical density of gold, which is 19.32 g / cm 3 ; X is the color of the gold mineral; S3. Calculate the grade of the gold mineral above the medium particle size according to the following formula; α=(M1+M2+....M i ) / m; Wherein, α is the grade of the gold mineral above the medium particle size; m is the mass of the heavy sand sample to be measured.

2. The method for measuring the level of gold minerals above the medium particle size in heavy sand according to claim 1, characterized in that: In step S2, the volume correction coefficient is measured by: selecting n gold minerals, smelting them into n regular cuboid structures respectively, measuring the length, width and thickness of each cuboid structure, and calculating the molten volume; and calculating the volume correction coefficient according to the following formula: K=(V 01 ′ / V 01 + V 02 ′ / V 02 +....V 0n ′ / V 0n ) / n; Where V 0n ' is the melting volume of the nth gold mineral; V 0n is the observed volume of the nth gold mineral; n≤i.

3. The method for measuring the level of gold minerals above the medium particle size in heavy sand according to claim 2, characterized in that: The selection is to divide the i gold minerals into several groups according to the particle size, and then select at least one from each group.

4. The method for measuring the level of gold minerals above the medium particle size in heavy sand according to claim 3, characterized in that: The smelting method comprises placing the gold mineral into a rectangular parallelepiped mold and placing the mold in a muffle furnace for high-temperature melting.

5. The method for measuring the level of gold minerals above the medium particle size in heavy sand according to claim 1, characterized in that: In the formula of step S2, X is the detected color X corresponding to the i-th gold mineral i , or X is the average color X′ of the gold mineral; X′=(X1+X2+….X j ) / j:j≤i。 6. The method for measuring the level of gold minerals above the medium particle size in heavy sand according to claim 5, characterized in that: The color is detected by SEM or electron probe.

7. The method for measuring the level of gold minerals above the medium particle size in heavy sand according to claim 1, characterized in that: In step S1, the selection is to screen out the gold minerals having a width greater than or equal to a preset value under a stereo microscope; the preset value is 0.037 mm.

8. The method for measuring the level of gold minerals above the medium particle size in heavy sand according to claim 7, characterized in that: The mass of the heavy sand sample to be measured is 4-10kg.

9. The method for measuring the level of gold minerals above the medium particle size in heavy sand according to claim 8, characterized in that: In step S1, before the selection, the heavy sand sample to be tested is divided into several samples to be tested, each of which has a mass of 0.8-1.2 kg, and is mixed after manual heavy panning.

10. Application of the method for measuring the grade of gold ores above the medium particle size in heavy sand as claimed in any one of claims 1 to 9 in mineral processing.

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