A method for measuring gold distribution in high-carbon ore

Abstract

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.

Description

Technical Field

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

[0002] With the continued growth of the global economy, the demand for various mineral resources continues to increase. The development and utilization of high-carbon ores, as mineral resources containing carbon and possessing potential economic value, are crucial to meeting this resource demand. For example, in the steel industry, iron ore is a primary raw material. Some high-carbon iron ores, after beneficiation, can be used as high-quality raw materials for ironmaking, helping to reduce production costs and improve economic efficiency.

[0003] High-carbon ores are typically complex, with high carbon contents and often closely associated or intertwined with other useful minerals. These properties make conventional beneficiation methods difficult to effectively separate and enrich useful minerals. Therefore, process mineralogy studies are needed to examine the distribution of gold in high-carbon ores. This research can guide beneficiation technology research, enabling efficient recovery of useful components while minimizing the adverse effects of carbon on subsequent smelting processes.

[0004] Currently, existing technologies use a single-mineral separation method: using gravity separation, magnetic separation, flotation, and other methods to separate major minerals such as carbonaceous minerals and sulfide minerals, the gold content of each individual mineral is measured separately, and the distribution rate of gold in different mineral phases is calculated based on the content of each mineral in the ore. However, the above methods are complex and the mineral separation is incomplete, which affects the final gold content measurement of the individual minerals. Therefore, it is necessary to use process mineralogy methods to accurately measure the distribution of gold in high-carbon ores.

[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, short in time and has high measurement accuracy to solve the above technical problems. Summary of the Invention

[0006] In response to the aforementioned technical problems in the prior art, the present invention provides a method for measuring the distribution of gold in high-carbon ores. This method is simple, easy to operate, and time-efficient. It can accurately determine the distribution of gold in various minerals within high-carbon ores, providing a basis for selecting mineral processing methods and processes, and achieving excellent results.

[0007] The present invention provides a method for measuring the distribution of gold in high-carbon ore, comprising the following steps:

[0008] S1, crush, screen, mix and grind the high carbon ore to obtain the experimental sample, and then test and measure the gold grade, which is recorded as Au. 原 ;

[0009] S2, take the experimental sample to make the electron probe sample, spray gold; make the MLA sample, spray carbon;

[0010] S3, quantitative analysis of the electron probe sample by electron probe to obtain the type of carbon mineral and the carbon content in the mineral;

[0011] S4, based on the measurement results of step S3, MLA qualitatively analyzes the MLA sample to measure the content of carbonate minerals and the content of sulfide minerals;

[0012] S5, taking the experimental sample of step S1, leaching it with the first reagent, and analyzing the gold grade Au1 to obtain the content of monomer and co-produced gold X1;

[0013] S6, take the experimental sample of step S1, the weight of which is G1, react the experimental sample with the second reagent to obtain the first acid residue, the weight of which is G 失重1 ; Then use the first reagent to leach to obtain the gold content in the carbonate mineral X2, and the leaching residue is tested to obtain the slag grade, which is calculated as Au2;

[0014] S7, take the experimental sample of step S1, weigh it as G2, use the third reagent to leaching gold, and obtain the second acid residue, weigh it as G 失重2 , get the gold content in the sulfide mineral X3, and get the slag grade by leaching slag analysis, which is calculated as Au3;

[0015] S8, take the experimental sample of step S1, calculate the weight as G3, react with the second reagent, and then treat with the fourth reagent to obtain the treated slag, calculate the weight as G 失重3 Take half of the treated slag and leach it with the first reagent to obtain the gold content in organic carbon and silicate minerals X5+X4. The leached slag is tested to obtain the slag grade, which is calculated as Au4. Take the remaining half of the treated slag and calcine it to obtain the calcined slag, the weight of which is calculated as G 失重4 , then use the first reagent to leaching gold, and the slag grade is obtained by chemical analysis and is calculated as Au5;

[0016] Among them, X1+X2+X3+X4+X5=100%.

[0017] As a further improvement of the present invention, the first agent is a mixture of iodine and potassium iodide;

[0018] In step S5, the experimental sample: iodine: potassium iodide: water = (40-60) g: (10-15) g: (25-30) g: (150-250) ml;

[0019] The content of monomer and interlinked gold is X1=(1-Au1 / Au 原 )×100%.

[0020] As a further improvement of the present invention, the second agent is acetic acid and / or phosphoric acid;

[0021] In step S6, experimental sample: second agent = (40-60) g: (150-250) ml;

[0022] First acid residue: iodine: potassium iodide: water = (40-60) g: (10-15) g: (25-30) g: (150-250) ml;

[0023] Gold content in carbonate minerals X2={100%-Au2×G 失重1 / (Au 原 ×G1)}-X1.

[0024] As a further improvement of the present invention, the third agent is a mixture of sodium hypoiodite and sodium chloride;

[0025] In step S7, the experimental sample is: sodium hypoiodite: sodium chloride: water = (40-60) g: (0.1-0.3) g: (0.2-0.6) g: (150-250) ml;

[0026] Gold content in sulfide minerals X3={100%-Au3×G 失重2 / (Au 原 ×G2)}-X1.

[0027] As a further improvement of the present invention, in step S8, the gold content in the silicate is X4=Au5×G 失重4 / (Au 原 ×0.5G3)×100%.

[0028] As a further improvement of the present invention, 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%.

[0029] As a further improvement of the present invention, in step S8, the process of the roasting treatment is set to:

[0030] Take the treated slag G 失重3 The product is calcined at 400-450° C., 220 V voltage, and 18-20 A current for 1-3 hours to obtain calcined slag.

[0031] As a further improvement of the present invention, the fourth agent is nitric acid;

[0032] In step S8, the process setting of using the fourth reagent treatment is: heating in a water bath at 70-100°C for 1.5-3 hours to obtain treated slag.

[0033] As a further improvement of the present invention, in step S8, the process ratio of the reaction between the treated slag or roasted slag and the first reagent is set to:

[0034] Treated slag or roasted slag: iodine: potassium iodide: water = (40~60) g: (10~15) g: (25~30) g: (150~250) ml.

[0035] As a further improvement of the present invention, in step S1, the fineness of the experimental sample is -0.074 mm, accounting for 80% by mass.

[0036] Beneficial effects:

[0037] 1. The method for measuring the gold distribution in high-carbon ores provided by the present invention has a simple process, fast operation, short measurement time, and accurate measurement data. It can intuitively represent the distribution rate of gold in various types of ores, and can quickly provide a basis for the selection of mineral processing methods and processes. It has important economic and social significance for my country's environmental protection and comprehensive resource utilization.

[0038] 2. The method for measuring the distribution of gold in high-carbon ores provided by the present invention first uses an electron probe and MLA measurement technology to perform quantitative / qualitative analysis on the ore test samples, thereby obtaining the type of carbon minerals and the carbon content in the minerals, as well as the carbonate mineral content and the content of other minerals; and, based on the results of this quantitative and qualitative analysis, the gold content of each subdivided mineral type is determined, and while measuring the gold content, the content data of each type of mineral can be corrected, thereby significantly improving the measurement precision and accuracy. Furthermore, for different types of minerals, different reagents and different leaching processes are used for determination, and the gold content of different types of minerals can be accurately and effectively measured. Thus, high-precision and rapid measurement of gold distribution in high-carbon ores is achieved 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 different treatment slag grades in each intermediate process, and improving precision and accuracy.

[0039] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, 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 invention more obvious and easy to understand, the specific implementation methods of the present invention are specifically listed below. DETAILED DESCRIPTION

[0040] The following embodiments of the technical solution of the present invention are described in detail. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only used as examples and are not intended to limit the scope of protection of the present invention.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art 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 description and claims of the present invention are intended to cover non-exclusive inclusions.

[0042] In the description of the embodiments of the present invention, technical terms such as "first" and "second" are used solely to distinguish between different objects and should not be understood to indicate or imply relative importance or to implicitly specify the quantity, specific order, or primary and secondary relationship of the technical features indicated. In the description of the embodiments of the present invention, "plurality" means more than two, unless otherwise specifically defined.

[0043] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute a separate or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0044] In the description of the embodiments of the present invention, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exists simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0045] In the description of the embodiments of the present invention, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0046] In the description of the embodiments of the present invention, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., which indicate orientations or positional relationships, are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the embodiments of the present invention.

[0047] In the description of the embodiments of the present invention, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on specific circumstances.

[0048] In order to solve the technical problems in the prior art of complicated measurement processes and incomplete mineral separation, which affect the final measurement results of the gold content in a single mineral and lead to poor measurement accuracy, the present invention provides a method for measuring the gold distribution in high-carbon ores, comprising the following steps:

[0049] S1, crush, screen, mix and grind the high carbon ore to obtain the experimental sample, and then test and measure the gold grade, which is recorded as Au. 原 ;

[0050] S2, take the experimental sample to make the electron probe sample, spray gold; make the MLA sample, spray carbon;

[0051] S3, quantitative analysis of the electron probe sample by electron probe to obtain the type of carbon mineral and the carbon content in the mineral;

[0052] S4, based on the measurement results of step S3, MLA qualitatively analyzes the MLA sample to measure the content of carbonate minerals and the content of sulfide minerals;

[0053] S5, taking the experimental sample of step S1, leaching it with the first reagent, and analyzing the gold grade Au1 to obtain the content of monomer and co-produced gold X1;

[0054] S6, take the experimental sample of 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 use the first reagent to leach to obtain the gold content in the carbonate mineral X2, and the leaching residue is tested to obtain the slag grade, which is calculated as Au2;

[0055] S7, take the experimental sample of step S1, weigh it as G2, use the third reagent to leaching gold, and obtain the second acid residue, weigh it as G 失重2 , get the gold content in the sulfide mineral X3, and get the slag grade by leaching slag analysis, which is calculated as Au3;

[0056] S8, take the experimental sample of step S1, calculate the weight as G3, react with the second reagent, and then treat with the fourth reagent to obtain the treated slag, calculate the weight as G 失重3Take half of the treated slag and leach it with the first reagent to obtain the gold content in organic carbon and silicate minerals X5+X4. The leached slag is tested to obtain the slag grade, which is calculated as Au4. Take the remaining half of the treated slag and calcine it to obtain the calcined slag, the weight of which is calculated as G 失重4 , then use the first reagent to leaching gold, and the slag grade is obtained by chemical analysis and is calculated as Au5;

[0057] Among them, X1+X2+X3+X4+X5=100%.

[0058] Preferably, the first agent is a mixture of iodine and potassium iodide;

[0059] In step S5, the experimental sample: iodine: potassium iodide: water = (40-60) g: (10-15) g: (25-30) g: (150-250) ml;

[0060] X1=(1-Au1 / Au 原 )×100%.

[0061] Preferably, the second agent is acetic acid and / or phosphoric acid;

[0062] In step S6, experimental sample: second agent = (40-60) g: (150-250) ml;

[0063] First acid residue: iodine: potassium iodide: water = (40-60) g: (10-15) g: (25-30) g: (150-250) ml;

[0064] Gold content in carbonate minerals X2={100%-Au2×G 失重1 / (Au 原 ×G1)}-X1.

[0065] Preferably, the third agent is a mixture of sodium hypoiodite and sodium chloride;

[0066] In step S7, the experimental sample is: sodium hypoiodite: sodium chloride: water = (40-60) g: (0.1-0.3) g: (0.2-0.6) g: (150-250) ml;

[0067] Gold content in sulfide minerals X3={100%-Au3×G 失重2 / (Au 原 ×G2)}-X1.

[0068] Preferably, in step S8, the gold content in the silicate is X4=Au5×G 失重4 / (Au 原 ×0.5G3)×100%.

[0069] Preferably, 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%.

[0070] Preferably, in step S8, the roasting process is set as follows:

[0071] Take the treated slag G 失重3 The product is calcined at 400-450° C., 220 V voltage, and 18-20 A current for 1-3 hours to obtain calcined slag.

[0072] Preferably, the fourth agent is nitric acid;

[0073] In step S8, the process setting of using the fourth reagent treatment is: heating in a water bath at 70-100°C for 1.5-3 hours to obtain treated slag.

[0074] Preferably, in step S8, the process ratio of the reaction between the treated slag or the roasted slag and the first reagent is set to:

[0075] Treated slag or roasted slag: iodine: potassium iodide: water = (40~60) g: (10~15) g: (25~30) g: (150~250) ml.

[0076] Preferably, in step S1, the fineness of the experimental sample is -0.074 mm, accounting for 80% by mass.

[0077] Example 1

[0078] Example 1 of the present invention provides a method for measuring the distribution of gold in high-carbon ore, taking a Guizhou ore as an ore sample, and specifically comprising the following steps:

[0079] S1, the raw ore is jaw crushed, screened, mixed, finely ground, mixed again, and ground to a fineness of -0.074mm with a mass fraction of 80% to obtain the experimental sample, and the gold grade is measured by chemical analysis, recorded as Au 原 =1.990g / t.

[0080] S2, take the experimental sample to make the electron probe sample, spray gold; make the MLA sample, spray carbon;

[0081] S3, using electron probe to quantitatively measure and analyze the types of carbon minerals and the carbon content in the minerals, including organic carbon, calcite, dolomite, etc.

[0082] S4. Based on the measurement results of step S3, the MLA sample is qualitatively analyzed using MLA to measure the relative content of carbonate minerals (21.37%) and the contents of other minerals, including sulfides (17.24%), oxides (0.24%), and other gangue.

[0083] S5, taking the experimental sample of step S1, leaching it with the first reagent iodine and potassium iodide, and the gold grade Au1=1.090g / t, and the content of monomer and co-produced gold is 45.23%.

[0084] The leaching ratio is set as follows:

[0085] Experimental sample: iodine: potassium iodide: water = 50g: 12g: 28g: 200ml,

[0086] Among them, the content of monomer and interlinked gold is X1=(1-Au1 / Au 原 )×100%=(1-1.090 / 1.441)×100%=45.23%.

[0087] S6, take the experimental sample of step S1, weigh 30g, and react it with the second reagent acetic acid or phosphoric acid, with a concentration of 30%, under room temperature conditions, for 15-30 minutes, and observe until the bubbles disappear, to obtain acetic acid residue or phosphoric acid residue, the weight of which is G 失重1 =23.59g; then leaching with the first reagent iodine and potassium iodide to obtain the gold content in the carbonate mineral, and the leached slag is tested to obtain the slag grade, which is calculated as Au2=1.183g / t, and the weight lost by the acetic acid slag / phosphoric acid slag (100-78.63) is equal to the carbonate mineral content in step S4, further correcting the accuracy.

[0088] The leaching ratio is set as follows:

[0089] Experimental sample: acetic acid or phosphoric acid = 50g: 200ml;

[0090] Acetic acid residue / phosphoric acid residue: iodine: potassium iodide: water = 50g: 12g: 28g: 200ml.

[0091] Among them, the gold content in carbonate minerals is X2={100%-Au2×G 失重1 / (Au 原 ×G1)}-X1={100%-1.183×23.59 / (1.990×30)}-45.23%=8.03%.

[0092] S7, take the experimental sample of step S1, weigh it as G2 = 50g, use the third reagent sodium hypoiodite and sodium chloride to leaching gold, obtain iodic acid residue, weigh it as G 失重2=41.26g, the purpose is to obtain the gold content in the sulfide mineral, the slag grade is obtained by leaching slag analysis, and it is calculated as Au3=0.351g / t, and the weight lost by iodic acid slag (100-82.52) is equal to the sum of the metal mineral contents in step S4, which is further corrected for accuracy.

[0093] The leaching ratio is set as follows:

[0094] Experimental sample: sodium hypoiodite: sodium chloride: water = 50g: 0.2g: 0.4g: 200ml.

[0095] Among them, the gold content in sulfide minerals is X3={100%-Au3×G 失重2 / (Au 原 ×G2)}-X1={100%-0.351×41.26 / (1.990×50)}-45.23%=40.22%.

[0096] S8, take the experimental sample of step S1, weigh it as G3 = 100g, 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℃ for 1.5-3h, and obtain the treated slag, weigh it as G 失重3 =61.15g, take half of the weight loss and then use the first reagent iodine and potassium iodide to leach, the purpose is to obtain the gold content in organic carbon and silicate minerals, the leached slag is tested to obtain the slag grade, calculated as Au4=0.212g / t, take the remaining 0.5G of the treated slag 失重3 The slag was obtained by roasting at 400~450℃, voltage 220V, current 18~20A for 2h. The weight was calculated as G 失重4 =30.52g, and then the gold is leached with the first reagent iodine and potassium iodide, and the slag grade is obtained by analysis, which is calculated as Au5=0.130g / t.

[0097] The leaching ratio is set as follows:

[0098] Roasted slag / treated slag: iodine: potassium iodide: water = 50g: 12g: 28g: 200ml.

[0099] Among them, the gold content in silicate is X4=Au5×G 失重4 / (Au 原 ×0.5G3)×100%=0.130×30.52 / (1.990×50)=3.99%;

[0100] Gold content in organic carbon X5={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%.

[0101] After the above measurement steps, the specific gold distribution of the high-carbon ore provided in Example 1 is shown in Table 1 below.

[0102] Table 1 shows the gold distribution in high carbon ore of Example 1

[0103]

[0104] Example 2

[0105] Example 2 of the present invention provides a method for measuring the gold distribution in high-carbon ore, using raw ore from a gold mine in Tibet as a sample, and specifically comprising the following steps:

[0106] S1, the raw ore is jaw crushed, screened, mixed, finely ground, mixed again, and ground to a fineness of -0.074mm with a mass fraction of 80% to obtain the experimental sample, and the gold grade is measured by chemical analysis, recorded as Au 原 =3.754g / t.

[0107] S2, take the experimental sample to make the electron probe sample, spray gold; make the MLA sample, spray carbon.

[0108] S3, quantitative measurement and analysis of the types of carbon minerals and the carbon content in the minerals, including organic carbon, calcite, dolomite, etc.

[0109] S4. Based on the measurement results of step S3, MLA qualitative analysis was performed to measure the relative content of carbonate minerals (13.23%) and the contents of other minerals, including sulfides (17.14%), oxides (0.48%), and other gangue.

[0110] S5, taking the experimental sample in step S1, leaching it with the first reagent iodine and potassium iodide, and the gold grade Au1 = 2.167 g / t, and the content of single and continuous gold is 42.27%.

[0111] The leaching ratio is set as follows:

[0112] Experimental sample: iodine: potassium iodide: water = 50g: 12g: 28g: 200ml.

[0113] The content of monomer and interlinked gold is X1=(1-Au1 / Au 原 )×100%=(1-2.167 / 3.754)×100%=42.27%.

[0114] S6, take the experimental sample of step S1, weigh 100g, and react it with the second reagent acetic acid / phosphoric acid at a concentration of 30%, under room temperature conditions, for 15-30 minutes, and observe until the bubbles disappear, to obtain acetic acid or phosphoric acid residue, the weight of which is G 失重1 =86.77g, and then leached with the first reagent iodine and potassium iodide to obtain the gold content in the carbonate mineral. The leached slag is tested to obtain the slag grade, which is calculated as Au2=1.924g / t, and the weight lost by acetic acid / phosphoric acid slag (100-86.77) is equal to the carbonate mineral content in step 4, which is further corrected for accuracy.

[0115] The leaching ratio is set as follows:

[0116] Experimental sample: acetic acid / phosphoric acid = 50g: 200ml;

[0117] Acetic acid residue / phosphoric acid residue: iodine: potassium iodide: water = 50g: 12g: 28g: 200ml.

[0118] 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%.

[0119] S7, take the experimental sample of step S1, weigh it as G2 = 100g, use the third reagent sodium hypoiodite and sodium chloride to leaching gold, and obtain iodic acid residue, weigh it as G 失重2 =82.38g, the purpose is to obtain the gold content in the sulfide minerals, the slag grade is obtained by leaching slag analysis, and it is calculated as Au3=1.032g / t, and the weight lost by the iodic acid slag (100-82.37) is equal to the sum of the metal mineral contents in step S4, which is further corrected for accuracy.

[0120] The leaching ratio is set as follows:

[0121] Experimental sample: sodium hypoiodite: sodium chloride: water = 50g: 0.2g: 0.4g: 200ml.

[0122] 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%.

[0123] S8, take the experimental sample of step S1, weigh it as G3 = 100g, 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℃ for 1.5-3h, and obtain the treated slag, weigh it as G 失重3 =69.15g, take half of the weight loss and use the first reagent iodine and potassium iodide to leach, the purpose is to obtain the gold content in organic carbon and silicate minerals, the slag is tested to obtain the slag grade, calculated as Au4=0.510g / t, take the remaining 0.5G of the treated slag 失重3 The slag was obtained by roasting at 400~450℃, voltage 220V, current 18~20A for 2h. The weight was calculated as G 失重4 =34.55g, and then the gold is leached with the first reagent iodine and potassium iodide, and the slag grade is obtained by analysis, which is calculated as Au5=0.153g / t.

[0124] The leaching ratio is set as follows:

[0125] Roasted slag / treated slag: iodine: potassium iodide: water = 50g: 12g: 28g: 200ml.

[0126] Objective To obtain the gold content in silicate X4=Au5×G 失重4 / (Au 原 ×0.5G3)×100%=0.153×34.55 / (3.754×50)=2.82%.

[0127] Gold content in organic carbon X5={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%.

[0128] After the above measurement steps, the specific gold distribution of the high-carbon ore provided in Example 2 is shown in Table 2 below.

[0129] Table 2 shows the gold distribution in high carbon ore of Example 2

[0130]

[0131] Example 3

[0132] 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, and specifically comprising the following steps:

[0133] S1, the raw ore is jaw crushed, screened, mixed, finely ground, mixed again, and ground to a fineness of -0.074mm with a mass fraction of 80% to obtain the experimental sample, and the gold grade is measured by chemical analysis, recorded as Au 原 =2.476g / t.

[0134] S2, take the experimental sample to make the electron probe sample, spray gold; make the MLA sample, spray carbon.

[0135] S3, quantitative measurement and analysis of the types of carbon minerals and the carbon content in the minerals, including organic carbon, calcite, dolomite, etc.

[0136] S4, based on the measurement results of step S3, MLA qualitative analysis measures the relative content of carbonate minerals (12.55%) and the contents of other minerals, including sulfides (20.93%), oxides (0.61%), and other gangue.

[0137] S5, taking the experimental sample in step S1, leaching it with the first reagent iodine and potassium iodide, and the gold grade Au1 = 1.633 g / t, and the content of single and continuous gold is 34.05%.

[0138] The leaching ratio is set as follows:

[0139] Experimental sample: iodine: potassium iodide: water = 50g: 12g: 28g: 200ml.

[0140] The content of monomer and interlinked gold is X1=(1-Au1 / Au 原 )×100%=(1-1.633 / 2.476)×100%=34.05%.

[0141] S6, take the experimental sample of step S1, weigh 100g, and react it with the second reagent acetic acid / phosphoric acid at a concentration of 30%, under room temperature conditions, for 15-30 minutes, and observe until the bubbles disappear, to obtain acetic acid or phosphoric acid residue, the weight of which is G 失重1 =87.46g, and then leached with the first reagent iodine and potassium iodide to obtain the gold content in the carbonate mineral. The leached slag is tested to obtain the slag grade, which is calculated as Au2=1.405g / t, and the weight lost by the acetic acid / phosphoric acid slag (100-87.46) is equal to the carbonate mineral content in step S4, which is further corrected for accuracy.

[0142] The leaching ratio is set as follows:

[0143] Experimental sample: acetic acid / phosphoric acid = 50g: 200ml;

[0144] Acetic acid residue / phosphoric acid residue: iodine: potassium iodide: water = 50g: 12g: 28g: 200ml.

[0145] 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%.

[0146] S7, take the experimental sample of step S1, weigh it as G2 = 100g, use the third reagent sodium hypoiodite and sodium chloride to leaching gold, and obtain iodic acid residue, weigh it as G 失重2 =78.46g, the purpose is to obtain the gold content in the sulfide mineral, the slag grade is obtained by leaching slag analysis, calculated as Au3=1.115g / t, and the weight lost by iodic acid slag (100-78.46) is equal to the sum of the metal mineral contents in step 4, further correcting the accuracy.

[0147] The leaching ratio is set as follows:

[0148] Experimental sample: sodium hypoiodite: sodium chloride: water = 50g: 0.2g: 0.4g: 200ml.

[0149] Gold content in sulfide minerals X3={100%-Au3×G 失重2 / (Au 原 ×G2)}-X1={100%-1.115×78.46 / (2.476×100)}-34.05%=30.62%.

[0150] S8, take the experimental sample of step S1, weigh it as G3 = 100g, 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℃ for 1.5-3h, and obtain the treated slag, weigh it as G 失重3 =65.92g, take half of the weight loss and use the first reagent iodine and potassium iodide to leach, the purpose is to obtain the gold content in organic carbon and silicate minerals, the leached slag is tested to obtain the slag grade, calculated as Au4=0.714g / t, take the remaining 0.5G of the treated slag 失重3 The slag was obtained by roasting at 400~450℃, voltage 220V, current 18~20A for 2h. The weight was calculated as G 失重4 =32.95g, and then the gold is leached with the first reagent iodine and potassium iodide, and the slag grade is obtained by analysis, which is calculated as Au5=0.124g / t.

[0151] The leaching ratio is set as follows:

[0152] Roasted slag / treated slag: iodine: potassium iodide: water = 50g: 12g: 28g: 200ml.

[0153] Objective To obtain the gold content in silicate X4=Au5×G 失重4 / (Au 原 ×0.5G3)×100%=0.124×32.95 / (2.476×50)=3.30%;

[0154] Gold content in organic carbon X5={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%.

[0155] After the above measurement steps, the specific gold distribution of the high-carbon ore provided in Example 3 is shown in Table 3 below.

[0156] Table 3 shows the gold distribution in high carbon ore of Example 3

[0157]

[0158] Those skilled in the art will appreciate that, depending on the actual type of ore and the application, the settings of the various process parameters in the method for measuring the gold distribution in high-carbon ore provided by the present invention can be adjusted accordingly, and are not limited to the parameter data settings in the above-mentioned specific embodiments.

[0159] In summary, the present 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) preparation of experimental samples; 2) preparation of electron probe and MLA samples; 3) quantitative analysis of carbon mineral types and carbon content in the minerals by electron probe; 4) qualitative analysis of carbonate minerals and other minerals by MLA; 5) determination of the gold content, both individual and associated with ore and diagenetic components; 6) determination of the gold content in carbonate minerals; 7) determination of the gold content in metallic minerals; and 8) determination of 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 processes. It has significant economic and social significance for environmental protection and comprehensive resource utilization in my country. 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 mineral content data during the measurement process, significantly improving accuracy.

[0160] It should be noted that the present invention is not limited to the above-mentioned embodiments. The above-mentioned embodiments are merely examples, and any embodiments having substantially the same structure and effect as the technical concept within the scope of the technical solution of the present invention are all included in the technical scope of the present invention. In addition, without departing from the scope of the present invention, other embodiments that can be conceived by those skilled in the art and that combine some of the constituent elements in the embodiments are also included in the scope of the present invention.

Claims

1. A method for measuring gold distribution in high-carbon ore, characterized in that: The steps include: S1, pre-process 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, quantitative analysis of the electron probe sample by electron probe to obtain the type of carbon mineral and the carbon content in the mineral; S4, based on the measurement results 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, take the experimental sample of step S1, leach it with the first reagent, test the gold grade Au1, and obtain the content of monomer and continuous gold X1; the first reagent is a mixture of iodine and potassium iodide, the content of monomer and continuous gold X1 = (1-Au1 / Au 原 )×100%; S6, take the experimental sample of step S1, the weight of which is G1, react the experimental sample with the second reagent to obtain the first acid residue, the weight of which is G 失重1 ; Then use the first reagent to leach, and obtain the gold content in the carbonate mineral X2, and the slag is tested to obtain the slag grade, which is calculated as Au2; the second reagent is acetic acid and / or phosphoric acid, and the gold content in the carbonate mineral X2={100%-Au2×G 失重1 / (Au 原 ×G1)}-X1; S7, take the experimental sample of step S1, weigh it as G2, use the third reagent to leaching gold, and obtain the second acid residue, weigh it as G 失重2 , the gold content in the sulfide mineral is X3, and the slag grade is obtained by leaching slag test, which is calculated as Au3; the third reagent is a mixture of sodium hypoiodite and sodium chloride; the gold content in the sulfide mineral X3={100%-Au3×G 失重2 / (Au 原 ×G2)}-X1; S8, take the experimental sample of step S1, calculate the weight as G3, react with the second reagent, and then treat with the fourth reagent to obtain the treated slag, calculate the weight as G 失重3 Take half of the treated slag and leach it with the first reagent to obtain the gold content in organic carbon and silicate X5 + X4, and the slag is tested to obtain the slag grade, which is calculated as Au4; take the remaining half of the treated slag and calcine it to obtain the calcined slag, the weight of which 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; the fourth reagent is nitric acid; the gold content in the silicate X4=Au5×G 失重4 / (Au 原 ×0.5G3)×100%;X5={Au4×G 失重3 / (Au 原 ×G3)-Au5×G 失重4 / (Au 原 ×0.5G3)}×100%; Among them, X1+X2+X3+X4+X5=100%.

2. The method for measuring gold distribution in high-carbon ore according to claim 1, characterized in that: In step S5, the experimental sample is: iodine: potassium iodide: water = (40-60) g: (10-15) g: (25-30) g: (150-250) ml.

3. The method for measuring gold distribution in high-carbon ore according to claim 2, characterized in that: 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.

4. The method for measuring gold distribution in high-carbon ore according to claim 3, characterized in that: In step S7, the experimental sample is: sodium hypoiodite: sodium chloride: water = (40-60) g: (0.1-0.3) g: (0.2-0.6) g: (150-250) ml.

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

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

7. The method for measuring 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.

8. The method for measuring 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 is 80%.

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