Method for measuring gold distribution in high-carbon ore

Abstract

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.

Description

Technical Field

[0001] The present invention relates to the technical fields of mineral processing and mineral content measurement, and particularly to a method for measuring the gold distribution in high-carbon ores. Background Art

[0002] With the continuous growth of the global economy, the demand for various mineral resources is increasing. As a kind of mineral resource containing carbon elements and having potential economic value, the development and utilization of high-carbon ores are of great significance for meeting resource demands. For example, in the steel industry, iron ore is the main raw material, and after beneficiation treatment, some high-carbon iron ores can be used as high-quality raw materials for ironmaking, which helps to reduce production costs and improve economic benefits.

[0003] The properties of high-carbon ores are usually complex, with a high carbon content and often closely symbiotic or mutually encapsulated with other useful minerals. The above properties make it difficult for conventional beneficiation methods to effectively separate and enrich useful minerals. It is necessary to carry out process mineralogy research on high-carbon ores to investigate the metal distribution of gold in high-carbon ores, so as to guide the research of beneficiation technology, achieve efficient recovery of useful components, and at the same time reduce the adverse effects of carbon on subsequent smelting and other processes.

[0004] Currently, the prior art adopts the single mineral separation method: by means of gravity separation, magnetic separation, flotation and other methods, the main minerals such as carbon-containing minerals and sulfide minerals are separated, the gold content in each single mineral is measured respectively, and combined with the content of each mineral in the ore, the distribution rate of gold in different mineral phases is calculated. However, the above method has a complex process and incomplete mineral separation, which affects the measurement results of the gold content in the final single mineral. Therefore, it is necessary to accurately calculate the gold distribution in high-carbon ores by using process mineralogy methods.

[0005] In view of this, it is necessary to study a method for measuring the gold distribution in high-carbon ores that is simple, easy to operate, time-consuming and has a high measurement accuracy to solve the above technical problems. Summary of the Invention

[0006] In view of the above technical problems existing in the background art, the present invention provides a method for measuring the gold distribution in high-carbon ores. This determination method is simple, easy to operate, time-consuming, can accurately determine the gold distribution in various minerals in high-carbon ores, provide a basis for the selection of beneficiation process methods and processes, and obtain good results.

[0007] The present invention provides a method for measuring the gold distribution in high-carbon ores, including the following steps: S1, the high-carbon ore raw ore is crushed, screened, mixed evenly, and finely ground for pretreatment to obtain an experimental sample, and the gold grade is measured by chemical analysis and recorded as Au 原 ; S2. Take the experimental sample to prepare an electron probe sample and sputter it with gold; prepare an MLA sample and sputter it with carbon; S3. Perform quantitative analysis on the electron probe sample using an electron probe to obtain the types of carbon minerals and the carbon content in the minerals; S4. According to the measurement results of step S3, perform qualitative analysis on the MLA sample using MLA to measure the contents of carbonate minerals and sulfide minerals; S5. Take the experimental sample from step S1, leach it with the first reagent, assay the gold grade Au1, and obtain the content of monomeric and associated gold X1; S6. Take the experimental sample from step S1, weigh it as G1, react the experimental sample with the second reagent to obtain the first acid residue, weigh it as G 失重1 ; then leach it with the first reagent to obtain the gold content X2 in carbonate minerals, and assay the residue of the leached residue to obtain the residue grade, denoted as Au2; S7. Take the experimental sample from step S1, weigh it as G2, leach gold with the third reagent to obtain the second acid residue, weigh it as G 失重2 , obtain the gold content X3 in sulfide minerals, and assay the residue of the leached residue to obtain the residue grade, denoted as Au3; S8. Take the experimental sample from step S1, weigh it as G3, react it with the second reagent, and then treat it with the fourth reagent to obtain the treated residue, weigh it as G 失重3 ; take half of the treated residue and leach it with the first reagent to obtain the gold content X5 + X4 in organic carbon and silicate minerals, and assay the residue of the leached residue to obtain the residue grade, denoted as Au4; take the remaining half of the treated residue for roasting treatment to obtain the roasted residue, weigh it as G 失重4 , and then leach gold with the first reagent and assay to obtain the residue grade, denoted as Au5; Among them, X1 + X2 + X3 + X4 + X5 = 100%.

[0008] As a further improvement of the present invention, the first reagent is a mixture of iodine and potassium iodide; In step S5, experimental sample: iodine: potassium iodide: water = (40 - 60) g: (10 - 15) g: (25 - 30) g: (150 - 250) ml; The content of monomeric and associated gold X1 = (1 - Au1 / Au 原 ) × 100%.

[0009] As a further improvement of the present invention, the second reagent is acetic acid and / or phosphoric acid; In step S6, experimental sample: second reagent = (40 - 60) g: (150 - 250) ml; First acid residue: iodine: potassium iodide: water = (40 - 60) g: (10 - 15) g: (25 - 30) g: (150 - 250) ml; The gold content X2 in carbonate minerals = {100% - Au2 × G 失重1 / (Au 原 × G1)} - X1.

[0010] As a further improvement of the present invention, the third reagent is a mixture of sodium hypoiodite and sodium chloride; In step S7, experimental sample: sodium hypoiodite: sodium chloride: water = (40 - 60) g: (0.1 - 0.3) g: (0.2 - 0.6) g: (150 - 250) ml; The gold content X3 in sulfide minerals = {100% - Au3 × G 失重2 / (Au 原 × G2)} - X1.

[0011] As a further improvement of the present invention, in step S8, the gold content X4 in silicate = Au5 × G 失重4 / (Au 原 × 0.5G3) × 100%.

[0012] As a further improvement of the present invention, in step S8, the gold content X5 in organic carbon = {Au4 × G 失重3 / (Au 原 × G3) - Au5 × G 失重4 / (Au 原 × 0.5G3)} × 100%.

[0013] As a further improvement of the present invention, in step S8, the process setting of roasting treatment is: Take the treated slag G 失重3 Roast at 400 - 450 °C, voltage 220V, current 18 - 20A for 1 - 3h to obtain roasted slag.

[0014] As a further improvement of the present invention, the fourth reagent is nitric acid; In step S8, the process setting of treating with the fourth reagent is: water bath heating at 70 - 100 °C for 1.5 - 3h to obtain treated slag.

[0015] As a further improvement of the present invention, in step S8, the process ratio of the treated slag or roasted slag reacting with the first reagent is set as: Treated slag or roasted slag: iodine: potassium iodide: water = (40 - 60) g: (10 - 15) g: (25 - 30) g: (150 - 250) ml.

[0016] As a further improvement of the present invention, in step S1, the fineness of the experimental sample is that the mass fraction of -0.074mm accounts for 80%.

[0017] Beneficial effects: 1. The measurement method for the gold distribution in high-carbon ores provided by the present invention has a simple process, rapid operation, short time consumption, accurate measurement data, can intuitively represent the distribution rate of gold in various ores, and can quickly provide a basis for the selection of ore dressing process methods and processes, which has important economic and social significance for environmental protection and comprehensive utilization of resources in China.

[0018] 2. For the measurement method for the gold distribution in high-carbon ores provided by the present invention, first, quantitative / qualitative analysis is respectively carried out on the ore experimental samples by using electron probe and MLA measurement techniques, thereby obtaining the types of carbon minerals, the carbon content in the minerals, the carbonate mineral content and the contents of other minerals; and, on the basis of the quantitative and qualitative analysis results, the gold content of each subdivided mineral type is further measured, and while measuring the gold content, the content data of each type of mineral can be corrected, thereby significantly improving the measurement accuracy and precision. Further, for different mineral types, different reagents and different leaching processes are respectively adopted for measurement, and the gold contents of different types of minerals can be accurately and effectively measured respectively. Thus, high-precision and rapid measurement of the gold distribution in high-carbon ores is realized from different dimensions and different processes. This measurement method is based on the calculation of the original ore grade, avoiding the errors caused by the grades of different treatment slags in each intermediate process and improving the accuracy and precision.

[0019] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly, it can be implemented according to the content of the description. And in order to make the above and other objects, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention are specifically exemplified below. Specific Embodiments

[0020] The embodiments of the technical solution of the present invention are described in detail below. The following embodiments are only used to illustrate the technical solution of the present invention more clearly, so they are only examples and cannot be used to limit the protection scope of the present invention.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" and any variations thereof in the specification and claims of the present invention are intended to cover non-exclusive inclusion.

[0022] In the description of the embodiments of the present invention, technical terms such as "first" and "second" are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity, specific order, or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present invention, the meaning of "a plurality of" is more than two, unless otherwise specifically defined.

[0023] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present invention. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0024] In the description of the embodiments of the present invention, the term "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this text generally represents an "or" relationship between the associated objects before and after.

[0025] In the description of the embodiments of the present invention, the term "a plurality of" refers to more than two (including two). Similarly, "a plurality of groups" refers to more than two groups (including two groups), and "a plurality of pieces" refers to more than two pieces (including two pieces).

[0026] In the description of the embodiments of the present invention, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0027] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0028] To solve the technical problems in the prior art that the measurement method process is complex and the mineral separation is not thorough, affecting the measurement results of the gold content in the final single mineral and resulting in poor measurement accuracy, the present invention provides a method for measuring the gold distribution in high-carbon ore, including the following steps: S1, crush, screen, mix, and finely grind the original high-carbon ore for pretreatment to obtain an experimental sample, and assay the gold grade, denoted as Au 原 ; S2, take the experimental sample to make an electron probe sample and sputter gold; make an MLA sample and sputter carbon; S3, quantitatively analyze the electron probe sample with an electron probe to obtain the types of carbon minerals and the carbon content in the minerals; S4, according to the measurement results of step S3, qualitatively analyze the MLA sample with MLA to measure the carbonate mineral content and the sulfide mineral content; S5, take the experimental sample in step S1, leach it with the first reagent, assay the gold grade Au1, and obtain the content of monomeric and associated gold X1; S6, take the experimental sample in step S1, weigh it as G1, react the experimental sample with the second reagent to obtain the first acid residue, weighed as G 失重1 ; then leach it with the first reagent to obtain the gold content X2 in the carbonate minerals, and assay the residue to obtain the residue grade, denoted as Au2; S7, take the experimental sample in step S1, weigh it as G2, leach gold with the third reagent to obtain the second acid residue, weighed as G 失重2 , obtain the gold content X3 in the sulfide minerals, and assay the residue to obtain the residue grade, denoted as Au3; S8, take the experimental sample in step S1, weigh it as G3, react it with the second reagent, and then treat it with the fourth reagent to obtain the treated residue, weighed as G 失重3 ; take half of the treated residue and leach it with the first reagent to obtain the gold content X5 + X4 in the organic carbon and silicate minerals, and assay the residue to obtain the residue grade, denoted as Au4; take the remaining half of the treated residue for roasting treatment to obtain the roasted residue, weighed as G 失重4 , and then leach gold with the first reagent and assay to obtain the residue grade, denoted as Au5; Among them, X1 + X2 + X3 + X4 + X5 = 100%.

[0029] Preferably, the first reagent is a mixture of iodine and potassium iodide; In step S5, experimental sample: iodine: potassium iodide: water = (40 - 60) g: (10 - 15) g: (25 - 30) g: (150 - 250) ml; X1 = (1 - Au1 / Au 原 ) × 100%.

[0030] Preferably, the second agent is acetic acid and / or phosphoric acid; In step S6, experimental sample: second agent = (40 - 60) g: (150 - 250) ml; First acid residue: iodine: potassium iodide: water = (40 - 60) g: (10 - 15) g: (25 - 30) g: (150 - 250) ml; The gold content X2 in carbonate minerals = {100% - Au2 × G 失重1 / (Au 原 × G1)} - X1.

[0031] Preferably, the third agent is a mixture of sodium hypoiodite and sodium chloride; In step S7, experimental sample: sodium hypoiodite: sodium chloride: water = (40 - 60) g: (0.1 - 0.3) g: (0.2 - 0.6) g: (150 - 250) ml; The gold content X3 in sulfide minerals = {100% - Au3 × G 失重2 / (Au 原 × G2)} - X1.

[0032] Preferably, in step S8, the gold content X4 in silicate = Au5 × G 失重4 / (Au 原 × 0.5G3) × 100%.

[0033] Preferably, in step S8, the gold content X5 in organic carbon = {Au4 × G 失重3 / (Au 原 × G3) - Au5 × G 失重4 / (Au 原 × 0.5G3)} × 100%.

[0034] Preferably, in step S8, the process settings for roasting treatment are as follows: Take the treatment residue G 失重3 Roast at 400 - 450 °C, voltage 220 V, current 18 - 20 A for 1 - 3 h to obtain the roasted residue.

[0035] Preferably, the fourth agent is nitric acid; In step S8, the process settings for treating with the fourth agent are as follows: water bath heating at 70 - 100 °C for 1.5 - 3 h to obtain the treatment residue.

[0036] Preferably, in step S8, the process ratio for the reaction of the treatment residue or the roasted residue with the first agent is set as follows: Treatment residue or roasted residue: iodine: potassium iodide: water = (40 - 60) g: (10 - 15) g: (25 - 30) g: (150 - 250) ml.

[0037] Preferably, in step S1, the fineness of the experimental sample is such that the mass fraction of -0.074 mm is 80%.

[0038] Example 1 Example 1 of the present invention provides a method for measuring the gold distribution in high-carbon ore. Taking a certain raw ore in Guizhou as the ore sample, it specifically includes the following steps: S1. The raw ore is subjected to jaw crushing, screening, mixing, fine grinding, and then mixing again, and ground to a fineness where the mass fraction of -0.074 mm is 80% to obtain an experimental sample, and the gold grade is measured by chemical analysis and denoted as Au 原 = 1.990 g / t.

[0039] S2. Take the experimental sample to make an electron probe sample and spray gold; make an MLA sample and spray carbon; S3. Use an electron probe to conduct quantitative measurement and analysis on the electron probe sample to determine the types of carbon minerals and the carbon content in the minerals, including organic carbon, calcite, dolomite, etc.

[0040] S4. According to the measurement results of step S3, use MLA to conduct qualitative analysis on the MLA sample to measure the relative content of carbonate minerals as 21.37% and the content of other minerals, including sulfides 17.24%, oxides 0.24%, and other gangues.

[0041] S5. Take the experimental sample from step S1, leach it with the first reagent iodine and potassium iodide reagent, measure the gold grade Au1 = 1.090 g / t by chemical analysis, and obtain the content of monomeric and associated gold as 45.23%.

[0042] The leaching ratio is set as follows: Experimental sample: iodine: potassium iodide: water = 50 g: 12 g: 28 g: 200 ml, wherein, the content of monomeric and associated gold X1 = (1 - Au1 / Au 原 ) × 100% = (1 - 1.090 / 1.441) × 100% = 45.23%.

[0043] S6. Take the experimental sample from step S1, weigh 30 g, react it with the second reagent acetic acid or phosphoric acid at a concentration of 30% under normal temperature conditions for 15 - 30 min, observe until the bubbles disappear to obtain acetic acid residue or phosphoric acid residue, and weigh it as G 失重1 = 23.59 g; then leach it with the first reagent iodine and potassium iodide reagent to obtain the gold content in the carbonate minerals, and measure the residue grade by chemical analysis of the leaching residue and denote it as Au2 = 1.183 g / t. And the weight loss of the acetic acid residue / phosphoric acid residue (100 - 78.63) is equal to the carbonate mineral content in step S4 to further correct the accuracy.

[0044] The leaching ratio is set as follows: Experimental sample: acetic acid or phosphoric acid = 50 g : 200 ml; Acetic acid residue / phosphoric acid residue: iodine : potassium iodide : water = 50 g : 12 g : 28 g : 200 ml.

[0045] Among them, the gold content X2 in carbonate minerals = {100% - Au2 × G 失重1 / (Au 原 × G1)} - X1 = {100% - 1.183 × 23.59 / (1.990 × 30)} - 45.23% = 8.03%.

[0046] S7, take the experimental sample in step S1, with the weight denoted as G2 = 50 g, leach gold with the third reagent sodium hypoiodite and sodium chloride to obtain hypoiodite residue, with the weight denoted as G 失重2 = 41.26 g, aiming to obtain the gold content in sulfide minerals, and the residue grade is obtained by assaying the leached residue, denoted as Au3 = 0.351 g / t, and the weight loss of the hypoiodite residue (100 - 82.52) is equal to the sum of the metal mineral contents in step S4, further correcting the accuracy.

[0047] The leaching ratio is set as follows: Experimental sample: sodium hypoiodite : sodium chloride : water = 50 g : 0.2 g : 0.4 g : 200 ml.

[0048] Among them, the gold content X3 in sulfide minerals = {100% - Au3 × G 失重2 / (Au 原 × G2)} - X1 = {100% - 0.351 × 41.26 / (1.990 × 50)} - 45.23% = 40.22%.

[0049] S8, take the experimental sample in step S1, with the weight denoted as G3 = 100 g, react it with the second reagent acetic acid / phosphoric acid, and then treat it with the fourth reagent nitric acid, heat it in a water bath at 70 - 100 °C for 1.5 - 3 h to obtain the treated residue, with the weight denoted as G 失重3 = 61.15 g, take half of the weight loss and leach it with the first reagent iodine and potassium iodide reagent, aiming to obtain the gold content in organic carbon and silicate minerals, and the residue grade is obtained by assaying the leached residue, denoted as Au4 = 0.212 g / t, take the remaining 0.5G of the treated residue 失重3 Roast it at 400 - 450 °C, under the environment of voltage 220 V and current 18 - 20 A for 2 h to obtain the roasted residue, with the weight denoted as G 失重4 = 30.52 g, and then leach gold with the first reagent iodine and potassium iodide reagent, and assay the residue grade, denoted as Au5 = 0.130 g / t.

[0050] The leaching ratio is set as follows: Roasted slag / Treated slag: iodine: potassium iodide: water = 50 g: 12 g: 28 g: 200 ml.

[0051] Among them, the gold content X4 in silicate = Au5 × G 失重4 / (Au 原 × 0.5G3) × 100% = 0.130 × 30.52 / (1.990 × 50) = 3.99%; The gold content X5 in organic carbon = {Au4 × G 失重3 / (Au 原 × G3) - Au5 × G 失重4 / (Au 原 × 0.5G3)} × 100% = {0.212 × 30.58 / (1.990 × 50) - 0.130 × 30.52 / (1.990 × 50)} × 100% = 2.53%.

[0052] After the above measurement steps, the specific gold distribution of the high-carbon ore provided in Example 1 is shown in Table 1 below.

[0053] Table 1 shows the gold distribution in the high-carbon ore of Example 1 Example 2 Example 2 of the present invention provides a method for measuring the gold distribution in high-carbon ore. Taking the raw ore of a gold mine in Tibet as a sample, it specifically includes the following steps: S1. Jaw-crush, screen, mix evenly, finely grind, and then mix evenly the raw ore, and grind it to a fineness of -0.074 mm with a mass fraction of 80% to obtain an experimental sample, and assay the gold grade, denoted as Au 原 = 3.754 g / t.

[0054] S2. Take the experimental sample to make an electron probe sample and spray gold; make an MLA sample and spray carbon.

[0055] S3. Electron probe quantitative measurement and analysis of the types of carbon minerals and the carbon content in the minerals, including organic carbon, calcite, dolomite, etc.

[0056] S4. According to the measurement results of step S3, MLA qualitative analysis measures the relative content of carbonate minerals of 13.23% and the content of other minerals, including sulfides of 17.14%, oxides of 0.48%, and other gangues.

[0057] S5. Take the experimental sample in step S1, leach it with the first reagent iodine and potassium iodide reagent, assay the gold grade Au1 = 2.167 g / t, and obtain the content of monomeric and associated gold of 42.27%.

[0058] The leaching ratio is set as follows: Experimental sample: iodine: potassium iodide: water = 50 g: 12 g: 28 g: 200 ml.

[0059] The content of monomer and associated gold X1 = (1 - Au1 / Au 原 ) × 100% = (1 - 2.167 / 3.754) × 100% = 42.27%.

[0060] S6. Take the experimental sample in step S1, with a weight of 100 g, react it with the second reagent acetic acid / phosphoric acid, with a concentration of 30%, at room temperature for 15 - 30 min, observe until the bubbles disappear, and obtain acetic acid or phosphoric acid residue, with a weight denoted as G 失重1 = 86.77 g. Then leach it with the first reagent iodine and potassium iodide reagent to obtain the gold content in carbonate minerals. Analyze the leaching residue to obtain the residue grade, denoted as Au2 = 1.924 g / t. And the weight loss of the acetic acid / phosphoric acid residue (100 - 86.77) is equal to the content of carbonate minerals in step four, further correcting the accuracy.

[0061] The leaching ratio is set as follows: Experimental sample: acetic acid / phosphoric acid = 50 g: 200 ml; Acetic acid residue / phosphoric acid residue: iodine: potassium iodide: water = 50 g: 12 g: 28 g: 200 ml.

[0062] The gold content in carbonate minerals X2 = {100% - Au2 × G 失重1 / (Au 原 × G1)} - X1 = {100% - 1.924 × 86.77 / (3.754 × 100)} - 42.27% = 13.25%.

[0063] S7. Take the experimental sample in step S1, with a weight denoted as G2 = 100 g, leach gold with the third reagent sodium hypoiodite and sodium chloride to obtain iodine acid residue, with a weight denoted as G 失重2 = 82.38 g. The purpose is to obtain the gold content in sulfide minerals. Analyze the leaching residue to obtain the residue grade, denoted as Au3 = 1.032 g / t. And the weight loss of the iodine acid residue (100 - 82.37) is equal to the total content of metal minerals in step S4, further correcting the accuracy.

[0064] The leaching ratio is set as follows: Experimental sample: sodium hypoiodite: sodium chloride: water = 50 g: 0.2 g: 0.4 g: 200 ml.

[0065] The gold content in sulfide minerals X3 = {100% - Au3 × G 失重2 / (Au 原×G2)}-X1 = {100% - 1.032×82.38 / (3.754×100)} - 42.27% = 35.08%.

[0066] S8. Take the experimental sample in step S1, weigh it as G3 = 100 g, react it with the second reagent acetic acid / phosphoric acid, then treat it with the fourth reagent nitric acid, heat it in a water bath at 70 - 100 °C for 1.5 - 3 h to obtain the treated residue, weigh it as G 失重3 = 69.15 g. Take half of the weight loss and leach it with the first reagent iodine and potassium iodide reagent to obtain the gold content in organic carbon and silicate minerals. Analyze the leached residue to obtain the residue grade, denoted as Au4 = 0.510 g / t. Take the remaining 0.5G of the treated residue 失重3 Roast it at 400 - 450 °C, 220 V voltage, 18 - 20 A current for 2 h to obtain the roasted residue, weigh it as G 失重4 = 34.55 g. Then leach the gold with the first reagent iodine and potassium iodide reagent, and analyze the leached residue to obtain the residue grade, denoted as Au5 = 0.153 g / t.

[0067] Set the leaching ratio as follows: Roasted residue / Treated residue: Iodine: Potassium iodide: Water = 50 g: 12 g: 28 g: 200 ml.

[0068] The purpose is to obtain the gold content X4 in silicate = Au5×G 失重4 / (Au 原 ×0.5G3)×100% = 0.153×34.55 / (3.754×50) = 2.82%.

[0069] The gold content X5 in organic carbon = {Au4×G 失重3 / (Au 原 ×G3) - Au5×G 失重4 / (Au 原 ×0.5G3)}×100% = {0.510×34.58 / (3.754×50) - 0.153×34.55 / (3.754×50)}×100% = 6.58%.

[0070] After the above measurement steps, the specific gold distribution of the high - carbon ore provided in Example 2 is shown in Table 2 below.

[0071] Table 2 shows the gold distribution in the high - carbon ore of Example 2 Example 3 Example 3 of the present invention provides a method for measuring the gold distribution in high - carbon ore. Taking the raw ore of a gold mine in Inner Mongolia as a sample, it specifically includes the following steps: S1. Jaw-crush, screen, mix, finely grind, and remix the raw ore until the fineness reaches 80% by mass fraction of -0.074 mm, obtaining an experimental sample, and assay the gold grade, denoted as Au 原 = 2.476 g / t.

[0072] S2. Take the experimental sample to prepare electron probe samples and sputter with gold; prepare MLA samples and sputter with carbon.

[0073] S3. Conduct quantitative measurement and analysis by electron probe on the types of carbon minerals and the carbon content in the minerals, including organic carbon, calcite, dolomite, etc.

[0074] S4. According to the measurement results of step S3, conduct qualitative analysis by MLA to measure the relative content of carbonate minerals at 12.55% and the content of other minerals, including sulfides at 20.93%, oxides at 0.61%, and other gangues.

[0075] S5. Take the experimental sample from step S1, leach it with the first reagent, iodine and potassium iodide reagent, assay the gold grade Au1 = 1.633 g / t, and obtain the content of monomeric and associated gold at 34.05%.

[0076] The leaching ratio is set as follows: Experimental sample: iodine: potassium iodide: water = 50 g: 12 g: 28 g: 200 ml.

[0077] The content of monomeric and associated gold X1 = (1 - Au1 / Au 原 ) × 100% = (1 - 1.633 / 2.476) × 100% = 34.05%.

[0078] S6. Take the experimental sample from step S1, weigh it as 100 g, react it with the second reagent, acetic acid / phosphoric acid, with a concentration of 30% at room temperature for 15 - 30 min, observe until the bubbles disappear, obtaining acetic acid or phosphoric acid residue, weighed as G 失重1 = 87.46 g, then leach it with the first reagent, iodine and potassium iodide reagent, aiming to obtain the gold content in carbonate minerals, assay the residue grade of the leached residue, denoted as Au2 = 1.405 g / t, and the weight loss of the acetic acid / phosphoric acid residue (100 - 87.46) is equal to the content of carbonate minerals in step S4, further correcting the accuracy.

[0079] The leaching ratio is set as follows: Experimental sample: acetic acid / phosphoric acid = 50 g: 200 ml; Acetic acid residue / phosphoric acid residue: iodine: potassium iodide: water = 50 g: 12 g: 28 g: 200 ml.

[0080] The gold content in carbonate minerals X2 = {100% - Au2 × G 失重1 / (Au原 ×G1) - X1 = {100% - 1.405×87.46 / (2.476×100)} - 34.05% = 16.32%.

[0081] S7. Take the experimental sample from step S1, weigh it as G2 = 100 g, leach the gold with the third reagent, sodium iodate and sodium chloride, to obtain iodic acid residue, weigh it as G 失重2 = 78.46 g. The purpose is to obtain the gold content in the sulfide minerals. Analyze the leaching residue to obtain the residue grade, denoted as Au3 = 1.115 g / t. And the weight loss of the iodic acid residue (100 - 78.46) is equal to the total content of the metal minerals in step four, further correcting the accuracy.

[0082] The leaching ratio is set as follows: Experimental sample: Sodium iodate: Sodium chloride: Water = 50 g: 0.2 g: 0.4 g: 200 ml.

[0083] The gold content X3 in the sulfide minerals = {100% - Au3×G 失重2 / (Au 原 ×G2)} - X1 = {100% - 1.115×78.46 / (2.476×100)} - 34.05% = 30.62%.

[0084] S8. Take the experimental sample from step S1, weigh it as G3 = 100 g, react it with the second reagent, acetic acid / phosphoric acid, and then treat it with the fourth reagent, nitric acid. Heat it in a water bath at 70 - 100 °C for 1.5 - 3 h to obtain the treated residue, weigh it as G 失重3 = 65.92 g. Take half of the weight loss and leach it with the first reagent, iodine and potassium iodide. The purpose is to obtain the gold content in the organic carbon and silicate minerals. Analyze the leaching residue to obtain the residue grade, denoted as Au4 = 0.714 g / t. Take the remaining 0.5G of the treated residue 失重3 Roast it at 400 - 450 °C, 220 V voltage, 18 - 20 A current for 2 h to obtain the roasted residue, weigh it as G 失重4 = 32.95 g. Then leach the gold with the first reagent, iodine and potassium iodide, and analyze to obtain the residue grade, denoted as Au5 = 0.124 g / t.

[0085] The leaching ratio is set as follows: Roasted residue / Treated residue: Iodine: Potassium iodide: Water = 50 g: 12 g: 28 g: 200 ml.

[0086] The purpose is to obtain the gold content X4 in the silicate = Au5×G 失重4 / (Au 原 ×0.5G3)×100% = 0.124×32.95 / (2.476×50) = 3.30%; The gold content X5 in organic carbon = {Au4 × G 失重3 / (Au 原 × G3) - Au5 × G 失重4 / (Au 原 × 0.5G3)} × 100% = {0.714 × 32.96 / (2.476 × 50) - 0.124 × 32.95 / (2.476 × 50)} × 100% = 15.71%.

[0087] After the above measurement steps, the specific gold distribution of the high-carbon ore provided in Example 3 is shown in Table 3 below.

[0088] Table 3 shows the gold distribution in the high-carbon ore of Example 3 Those skilled in the art know that according to the types and application situations of actual ores, the settings of various process parameters in the measurement method of gold distribution in the high-carbon ore provided by the present invention can be adjusted accordingly, and are not limited to the parameter data settings in the above specific embodiments.

[0089] In summary, the present invention provides a method for measuring the gold distribution in high-carbon ore, which relates to the technical fields of mineral processing and mineral content measurement, and includes the following steps: 1) Preparation of experimental samples; 2) Making electron probe samples and MLA samples; 3) Quantitative analysis of the types of carbon minerals and the carbon content in the minerals by electron probe; 4) Qualitative analysis of MLA to measure the content of carbonate minerals and the content of other minerals; 5) Determining the content of free gold and the gold content associated with ore and diagenetic components; 6) Determining the gold content in carbonate minerals; 7) Determining the gold content in metal minerals; 8) Determining the gold content in silicate and organic carbon. This determination method is simple, easy to operate, and time-consuming, and can quickly provide a basis for the selection of beneficiation process methods and processes, and has important economic and social significance for environmental protection and comprehensive utilization of resources in China. This measurement method is based on the calculation of the original ore grade, avoiding the errors caused by the grades of different treatment slags in each intermediate process, and can also perform secondary correction of mineral content data during the measurement process, significantly improving the accuracy and precision.

[0090] It should be noted that the present invention is not limited to the above embodiments. The above embodiments are only examples, and the embodiments with the same composition and the same effect as the technical idea within the technical solution scope of the present invention are included in the technical scope of the present invention. In addition, within the scope not departing from the gist of the present invention, various modifications that those skilled in the art can think of and other ways constructed by combining some constituent elements of the embodiments are also included in the scope of the present invention.

Claims

1. A method for measuring the distribution of gold in high-carbon ores, characterized in that: The steps include: S1, pre-treat the high carbon ore to obtain the experimental sample, and then test and measure the gold grade, which is recorded as Au 原 ; S2, take the experimental sample to make the electron probe sample, spray gold; make the MLA sample, spray carbon; S3, the electron probe quantitatively analyzes the electron probe sample to obtain the type of carbon mineral and the carbon content in the mineral; S4, according to the measurement result of step S3, MLA qualitatively analyzes the MLA sample to measure the content of carbonate minerals and the content of sulfide minerals and gangue minerals; S5, taking the experimental sample of step S1, leaching it with the first reagent, testing the gold grade Au1, and obtaining the content of monomer and continuous gold X1; S6, taking the experimental sample of step S1, the weight of which is calculated as G1, reacting the experimental sample with the second reagent to obtain the first acid slag, the weight of which is calculated as G 失重1 ; Then use the first reagent to leach to obtain the gold content X2 in the carbonate mineral, and the slag grade is obtained by leaching slag, which is calculated as Au2; S7, take the experimental sample of step S1, weigh it as G2, use the third reagent to leaching gold, and obtain the second acid slag, weigh it as G 失重2 , the gold content in the sulfide mineral is obtained as X3, and the slag grade is obtained by leaching slag analysis, which is calculated as Au3; S8, taking the experimental sample of step S1, weighing it as G3, reacting it with the second reagent, and then treating it with the fourth reagent to obtain a treated slag, weighing it as G 失重3 ; Take half of the treated slag and then leach it with the first reagent to obtain the gold content X5+X4 in organic carbon and silicate, and the slag grade is obtained by leaching the slag, which is calculated as Au4; take the remaining half of the treated slag for roasting treatment to obtain roasted slag, and the weight is calculated as G 失重4 , then use the first reagent to leaching gold, and the slag grade is obtained by chemical analysis, which is calculated as Au5; Among them, X1+X2+X3+X4+X5=100%.

2. The method for measuring the gold distribution in high-carbon ore according to claim 1, characterized in that: The first agent is a mixture of iodine and potassium iodide; In step S5, the experimental sample: iodine: potassium iodide: water = (40-60) g: (10-15) g: (25-30) g: (150-250) ml; Monomer and interlinked gold content X1 = (1-Au1 / Au 原 )×100%.

3. The method for measuring the gold distribution in high-carbon ore according to claim 2, characterized in that: The second agent is acetic acid and / or phosphoric acid; In step S6, experimental sample: second agent = (40-60) g: (150-250) ml; First acid residue: iodine: potassium iodide: water = (40~60) g: (10~15) g: (25~30) g: (150~250) ml; Gold content in carbonate minerals X2 = {100%-Au2×G 失重1 / (Au 原 ×G1)}-X1.

4. The method for measuring the gold distribution in high-carbon ore according to claim 3, characterized in that: The third agent is a mixture of sodium hypoiodite and sodium chloride; In step S7, the experimental sample: sodium hypoiodite: sodium chloride: water = (40-60) g: (0.1-0.3) g: (0.2-0.6) g: (150-250) ml; Gold content in sulfide minerals X3={100%-Au3×G 失重2 / (Au 原 ×G2)}-X1.

5. The method for measuring the gold distribution in high-carbon ore according to claim 1, characterized in that: In step S8, the gold content in the silicate is X4=Au5×G 失重4 / (Au 原 ×0.5G3)×100%.

6. The method for measuring the gold distribution in high-carbon ore according to claim 5, characterized in that: In step S8, the gold content in organic carbon is X5={Au4×G 失重3 / (Au 原 ×G3)-Au5×G 失重4 / (Au 原 ×0.5G3)}×100%.

7. The method for measuring the gold distribution in high-carbon ore according to claim 1, characterized in that: In step S8, the process setting of the roasting treatment is: The treated slag is roasted at 400-450° C., 220 V voltage and 18-20 A current for 1-3 h to obtain roasted slag.

8. The method for measuring the gold distribution in high-carbon ore according to claim 1, characterized in that: The fourth agent is nitric acid; In step S8, the process setting of using the fourth reagent treatment is: water bath heating at 70-100°C for 1.5-3h to obtain treated slag.

9. The method for measuring the gold distribution in high-carbon ore according to claim 1, characterized in that: In step S8, the process ratio of the reaction between the treated slag or the roasted slag and the first reagent is set to: Treated slag or roasted slag: iodine: potassium iodide: water = (40~60) g: (10~15) g: (25~30) g: (150~250) ml.

10. The method for measuring the gold distribution in high-carbon ore according to claim 1, characterized in that: In step S1, the fineness of the experimental sample is -0.074 mm and the mass fraction accounts for 80%.

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