Method for measuring carbonate mineral content

Abstract

The present application provides a method for measuring the content of carbonate minerals, which belongs to the technical field of process mineralogy. The method for measuring the content of carbonate minerals provided in the present application includes the steps of grinding, re-selection, preparing automatic mineral analysis samples, acid treatment, preparing analysis comparison samples, automatic mineralogical analysis testing and data correction. The present application introduces analysis comparison sample correction, combines automatic mineralogical analysis data, and prepares analysis comparison samples in a targeted manner, so that the analysis comparison samples are closer to actual samples and more representative, thereby making the test data more accurate and providing reliable data support for the efficient use of such resources.

Description

Technical Field

[0001] The invention relates to the technical field of process mineralogy, and in particular to a method for measuring the content of carbonate minerals. Background Art

[0002] Carbonate minerals contain carbonate ions (CO3 2- ) of minerals whose anions are [CO3 2- ], cations mainly include Ca 2+ Mg 2+ 、Mn + 、Fe 2+ Carbonates, among others, are found in a variety of ores and are one of the most widespread minerals in the Earth's crust, possessing significant economic and scientific value. The content of carbonate minerals is crucial for the utilization of ore resources. Ore types with varying carbonate content have varying impacts on ore beneficiation processes. For example, in flotation, carbonate minerals are less abrasive and are easily finely ground after grinding, resulting in smaller particle sizes. Fine-grained carbonate minerals tend to float into the concentrate during flotation, impacting the quality of the flotation concentrate. In acid leaching, carbonate minerals are acid-consuming, and their content directly influences the amount of acid leaching reagents used. Furthermore, Carlin-type gold deposits are a type of gold deposit associated with hydrothermal activity, primarily occurring in sedimentary rocks such as carbonates, fine clastic rocks, and siliceous rocks. The gold in these deposits is present at the micrometer or even nanometer level, typically dispersed within sulfide minerals (such as pyrite and arsenopyrite) or carbonates. Carlin-type gold deposits have attracted global attention for their unique geological characteristics and economic value. All these put forward higher requirements for the measurement of carbonate minerals.

[0003] Currently, automated mineralogy analysis often results in inaccurate measurements of carbonate mineral content. This is due to the fact that carbon spraying, a specific sample preparation step during automated mineralogy analysis, makes the surface of the sample conductive, preventing charge accumulation and enabling image recognition. This makes it difficult to distinguish between the sprayed carbon and the carbon in the sample itself (carbon in carbonate minerals), as the minerals also contain graphite and other carbon-containing minerals. Furthermore, when the final analysis results are low for various reasons, other elements can lead to misidentification as carbonate minerals.

[0004] In the prior art, a method for measuring molybdenite content is provided in the patent publication number CN118896887B. The method comprises grinding a sample to be tested to a predetermined fineness range, sequentially subjecting the ground sample to gravity separation, magnetic separation, and flotation operations, selecting high-purity molybdenite particles, and preparing comparative samples with different molybdenite contents. The prepared comparative samples are analyzed using automatic mineralogical analysis technology to obtain molybdenite content data. Simultaneously, automatic mineralogical analysis is performed on the sample to be tested, and the molybdenite content data of the sample to be tested is obtained through data correction. However, this method is a purposeless standard sample preparation method. For special carbonate minerals, there is still the problem of misidentifying the carbon sprayed on the sample and other carbon-containing minerals as carbonate minerals, resulting in inaccurate test results. Patent publication number CN114509528A provides a method for detecting the carbonate content in desulfurized gypsum, comprising the following steps: (1) mixing desulfurized gypsum with an acid solution to undergo a first reaction to obtain a gaseous product containing carbon dioxide; (2) passing the obtained gaseous product containing carbon dioxide into an excess of alkaline solution under closed conditions for a second reaction until no more bubbles are generated in the alkaline solution, thereby obtaining a solution containing soluble carbonates; (3) detecting the inorganic carbon content in the solution containing soluble carbonates using a TOC analyzer; and (4) calculating the carbonate content in the desulfurized gypsum based on the obtained inorganic carbon content. This invention uses a chemical method to measure mineral content, which may have problems such as incomplete dissolution and cross-contamination during dissolution. Furthermore, the method is subject to many factors affecting the determination, and has high operational requirements, which affects accuracy. Summary of the Invention

[0005] In view of the technical problems existing in the background technology, the present application provides a method for measuring the content of carbonate minerals, which aims to solve the problem that the existing carbonate mineral content testing method cannot eliminate some interfering elements, resulting in errors in the test results.

[0006] The present application provides a method for measuring the content of carbonate minerals, comprising the following steps:

[0007] S1. Select the sample to be tested and grind it;

[0008] S2. The ground sample is subjected to gravity separation to obtain gravity separation tailings a1, and the gravity separation yield is d;

[0009] S3. Sampling the gravity tailings sample a1, preparing an automatic mineralogical analysis sample to obtain a sample a2;

[0010] S4. Performing an automated mineralogical analysis on sample a2 to measure and compile the carbonate mineral particle size analysis results, and determining the content of the i-th carbonate mineral as bi, where the sum of the carbonate mineral contents is c, where c = ∑bi; i = 1, 2, ..., n, where n is the total number of carbonate mineral types measured;

[0011] S5. The gravity separation tailings sample a1 was sampled, acid treated, filtered, and dried to obtain sample a3;

[0012] S6. Samples jg of the sample a3 were sampled, and then f1 g and f2 g of calcium carbonate were added to obtain analytical comparison samples e1 and e2; wherein the analytical comparison samples e1 and e2 in calcium carbonate content were g1 times and g2 times the content of carbonate minerals in the sample a2 and c;

[0013] S7. The analysis comparison samples e1 and e2 are sampled and automatically prepared for mineralogical analysis, respectively, and are designated as h1 and h2;

[0014] S8. Automated mineralogical analysis was performed on the samples h1 and h2, respectively, to determine the total contents of carbonate minerals m1 and m2, respectively;

[0015] S9. Calculate the correction factor k and the actual content C of carbonate minerals in the sample a2: k=(g1+g2)*c / (m1+m2), C=c*k=k*∑bi;

[0016] S10. Calculate the actual content C' of carbonate minerals in the sample to be tested: C'=C*(1-d).

[0017] In the technical solution of the embodiments of the present application, the present application accurately measures the content of carbonate minerals in the ore sample through the steps of grinding, gravity separation, preparation of automatic mineral analysis samples, acid treatment, preparation of analytical comparison samples, automatic mineralogical analysis testing, and data correction. The present invention introduces analytical comparison sample correction, combines automatic mineralogical analysis data, and prepares analytical comparison samples in a targeted manner, making the analytical comparison samples closer to the actual samples and more representative, thereby making the test data more accurate and providing reliable data support for the efficient utilization of such resources.

[0018] In some embodiments, in step S1, the grinding fineness is -0.074 mm and the content is 65.0-75.0%.

[0019] In this embodiment, the sample to be tested is ground to a certain fineness to facilitate subsequent processing of the sample.

[0020] In some embodiments, in step S2, the re-selection is Nielsen re-selection; the yield d of the re-selection is 0.1-10.0%.

[0021] In this embodiment, carbonate minerals are enriched in the gravity separation tailings through gravity separation, while eliminating the interference of heavy minerals during testing.

[0022] In some embodiments, in step S3, the preparation process of the automatic mineralogical analysis sample includes: sample rolling, glue mixing, ultrasonic vibration, side cutting after curing, secondary mounting, grinding and polishing, and carbon spraying; in the glue mixing, the glue is epoxy resin glue and curing agent mixed in a volume ratio of 1:2, and the mass ratio of the sample to the glue is 1:2; in the grinding and polishing, the size of the grinding material is not less than 13μm, and the grinding time is 10~12min; the size of the polishing material is not greater than 0.5μm, and the polishing time is 10~12min.

[0023] In this embodiment, the gravity separation tailings are prepared into samples for automatic mineralogical analysis, and then the automatic mineralogical analysis is performed.

[0024] In some embodiments, in step S4, the acceleration voltage of the automatic mineralogical analysis test is 25 kV, the beam spot diameter is 6.5-7.0 μm, and the magnification is 300-1000 times.

[0025] In this embodiment, the carbonate mineral particle size analysis results are obtained by performing automatic mineralogical analysis on the gravity separation tailings sample, which provides a basis for the subsequent preparation of analytical comparison samples, making the analytical comparison samples closer to the original ore.

[0026] In some embodiments, in step S5, the acid treatment agent is dilute hydrochloric acid, and the mass ratio of the dilute hydrochloric acid to the sample is 1:4; the temperature of the acid treatment is room temperature, and the endpoint of the acid treatment reaction is the reaction until there is no bubbling.

[0027] In this embodiment, the carbonate minerals in the gravity separation tailings sample a1 are dissolved by acid treatment, in preparation for the subsequent preparation of the comparative analysis sample.

[0028] In some embodiments, in step S6, the particle size of the calcium carbonate is consistent with the measurement result of the particle size distribution of the carbonate minerals in the sample a2 in step S4; and the purity of the calcium carbonate is above 99.99%.

[0029] In this embodiment, the particle size of calcium carbonate added to the analytical comparison sample is consistent with the measured result of the particle size distribution of carbonate minerals in sample a2, so that the prepared analytical comparison sample can be closer to the original ore.

[0030] In some embodiments, in step S6, the sampling amount jg of the sample a3 is 3-7 g; the multiple g1 is 0.7-0.9, g2 is 1.1-1.3, and g1+g2=2.

[0031] In this embodiment, a certain amount of calcium carbonate is added to the acid-treated sample a3, so that the composition content and structure of the obtained analytical comparison sample are similar to those of the original ore. The calcium carbonate content in the analytical comparison samples e1 and e2 is set to a specific multiple of the sum of the carbonate mineral contents in sample a2, which facilitates the calculation of the amount of calcium carbonate added. At the same time, g1 and g2 are within a specific range, and the calcium carbonate content can be tested within a range greater than or less than that of sample a2, without affecting the accuracy of the test and the representativeness of the sample by adding too little or too much calcium carbonate, and more sufficient correction data can be obtained.

[0032] In some embodiments, in step S7, the automatic mineralogical analysis preparation process and parameters of the comparative analysis samples e1 and e2 are consistent with those of the sample a2 in step S3; in step S8, the analysis conditions and parameters of the automatic mineralogical analysis are consistent with those in step S4.

[0033] In this embodiment, the automatic mineralogical analysis preparation process and test conditions of the comparative sample are consistent with those of sample a2, ensuring that the test conditions of the comparative sample are close to the original sample and reducing errors.

[0034] 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

[0035] To more clearly illustrate the technical solution of this application, the following is a brief introduction to the drawings used in this application. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0036] Figure 1 This is a flow chart of the method for measuring the carbonate mineral content in Example 1.

[0037] Figure 2 This is a color chart of the automatic mineralogical analysis of carbonate minerals in the method for measuring the content of carbonate minerals in Example 1. DETAILED DESCRIPTION

[0038] The following embodiments of the technical solution of the present application are described in detail. 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 are not intended to limit the scope of protection of the present application.

[0039] 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 application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent 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.

[0040] In the description of the embodiments of this application, 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 exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0041] In order to solve the problem that the existing carbonate mineral content test method cannot eliminate some interfering elements, resulting in errors in the test results, the present application provides a method for measuring the content of carbonate minerals. The content of carbonate minerals in the ore sample is accurately measured through the steps of grinding, re-selection, preparation of automatic mineral analysis samples, acid treatment, preparation of analysis comparison samples, automatic mineralogical analysis testing and data correction. The present invention introduces analysis comparison sample correction, combines automatic mineralogical analysis data, and prepares analysis comparison samples in a targeted manner, so that the analysis comparison samples are closer to actual samples and more representative, thereby making the test data more accurate and providing reliable data support for the efficient use of such resources.

[0042] The present application provides a method for measuring the content of carbonate minerals, comprising the following steps:

[0043] S1. Select the sample to be tested and grind it;

[0044] S2. The ground sample is subjected to gravity separation to obtain gravity separation tailings a1, and the gravity separation yield is d;

[0045] S3. Sampling the gravity tailings sample a1, preparing an automatic mineralogical analysis sample to obtain a sample a2;

[0046] S4. Performing an automated mineralogical analysis on sample a2 to measure and compile the carbonate mineral particle size analysis results, and determining the content of the i-th carbonate mineral as bi, where the sum of the carbonate mineral contents is c, where c = ∑bi; i = 1, 2, ..., n, where n is the total number of carbonate mineral types measured;

[0047] S5. The gravity separation tailings sample a1 was sampled, acid treated, filtered, and dried to obtain sample a3;

[0048] S6. Samples jg of the sample a3 were sampled, and then f1 g and f2 g of calcium carbonate were added to obtain analytical comparison samples e1 and e2; wherein the analytical comparison samples e1 and e2 in calcium carbonate content were g1 times and g2 times the content of carbonate minerals in the sample a2 and c;

[0049] S7. The analysis comparison samples e1 and e2 are sampled and automatically prepared for mineralogical analysis, respectively, and are designated as h1 and h2;

[0050] S8. Automated mineralogical analysis was performed on the samples h1 and h2, respectively, to determine the total contents of carbonate minerals m1 and m2, respectively;

[0051] S9. Calculate the correction factor k and the actual content C of carbonate minerals in the sample a2, and obtain C=(g1+g2)*c from c / C=m1 / (g1*c)=m2 / (g2*c) 2 / (m1+m2), then k=(g1+g2)*c / (m1+m2), C=c*k=k*∑bi;

[0052] S10. Calculate the actual content C' of carbonate minerals in the sample to be tested: C'=C*(1-d).

[0053] In the technical solution of the embodiments of the present application, the content of carbonate minerals in the ore sample is accurately measured through the steps of grinding, gravity separation, preparation of automatic mineral analysis samples, acid treatment, preparation of analytical comparison samples, automatic mineralogical analysis testing, and data correction. The present invention introduces analytical comparison sample correction, combines automatic mineralogical analysis data, and prepares analytical comparison samples in a targeted manner, making the analytical comparison samples closer to the actual samples and more representative, thereby making the test data more accurate and providing reliable data support for the efficient utilization of such resources.

[0054] Furthermore, in some embodiments, in step S1, the grinding fineness is -0.074 mm and the content is 65.0-75.0%.

[0055] In the technical solution of the embodiment of the present application, the sample to be tested is ground to a certain fineness to facilitate the subsequent processing of the sample.

[0056] Furthermore, in some embodiments, in step S2, the gravity separation is Nielsen gravity separation; and the yield d of the gravity separation is 0.1-10.0%.

[0057] In the technical solution of the embodiment of the present application, carbonate minerals are enriched in the gravity separation tailings through gravity separation, while eliminating the interference of heavy minerals during testing.

[0058] Furthermore, in some embodiments, in step S3, the preparation process of the automatic mineralogical analysis sample includes: sample rolling, glue mixing, ultrasonic vibration, side cutting after curing, secondary mounting, grinding and polishing, and carbon spraying; in the glue mixing, the glue is a mixture of epoxy resin glue and curing agent in a volume ratio of 1:2, and the mass ratio of the sample to the glue is 1:2; in the grinding and polishing, the size of the grinding material is not less than 13um, and the grinding time is 10~12min; the size of the polishing material is not greater than 0.5μm, and the polishing time is 10~12min.

[0059] In the technical solution of the embodiment of the present application, the gravity separation tailings are made into automatic mineralogical analysis samples, and then automatic mineralogical analysis is carried out.

[0060] Furthermore, in some embodiments, in step S4, the acceleration voltage of the automatic mineralogical analysis test is 25 kV, the beam spot diameter is 6.5-7.0 μm, and the magnification is 300-1000 times.

[0061] In the technical solution of the embodiment of the present application, the carbonate mineral particle size analysis results are obtained by performing automatic mineralogical analysis on the gravity separation tailings sample, which provides a basis for the subsequent preparation of analytical comparison samples, making the analytical comparison samples closer to the original ore.

[0062] Furthermore, in some embodiments, in step S5, the acid treatment agent is dilute hydrochloric acid, and the mass ratio of the dilute hydrochloric acid to the sample is 1:4; the temperature of the acid treatment is room temperature, and the endpoint of the acid treatment reaction is the reaction until no bubbling occurs.

[0063] In the technical solution of the embodiment of the present application, the carbonate minerals in the gravity separation tailings sample a1 are dissolved by acid treatment, in preparation for the subsequent preparation of the comparative analysis sample.

[0064] Furthermore, in some embodiments, in step S6, the particle size of the calcium carbonate is consistent with the measurement result of the particle size distribution of the carbonate minerals in the sample a2 in step S4; and the purity of the calcium carbonate is above 99.99%.

[0065] In the technical solution of the embodiment of the present application, the particle size of the calcium carbonate added to the analytical comparison sample is consistent with the measurement result of the particle size distribution of the carbonate minerals in sample a2, so that the prepared analytical comparison sample can be closer to the original ore.

[0066] Furthermore, in some embodiments, in step S6, the sampling amount jg of the sample a3 is 3-7 g; the multiple g1 is 0.7-0.9, g2 is 1.1-1.3, and g1+g2=2.

[0067] In this embodiment, a certain amount of calcium carbonate is added to the acid-treated sample a3, so that the composition content and structure of the obtained analytical comparison sample are similar to those of the original ore. The calcium carbonate content in the analytical comparison samples e1 and e2 is set to a specific multiple of the sum of the carbonate mineral contents in sample a2, which facilitates the calculation of the amount of calcium carbonate added. At the same time, g1 and g2 are within a specific range, and the calcium carbonate content can be tested within a range greater than or less than that of sample a2, without affecting the accuracy of the test and the representativeness of the sample by adding too little or too much calcium carbonate, and more sufficient correction data can be obtained.

[0068] Furthermore, in some embodiments, in step S7, the automatic mineralogical analysis preparation process and parameters of the analysis comparison samples e1 and e2 are consistent with those of the sample a2 in step S3; in step S8, the analysis conditions and parameters of the automatic mineralogical analysis are consistent with those in step S4.

[0069] In the technical solution of the embodiment of the present application, the automatic mineralogical analysis preparation process and test conditions of the analysis comparison sample are consistent with those of sample a2, ensuring that the test conditions of the analysis comparison sample are close to the original sample and reducing errors.

[0070] Some specific examples are listed below. It should be noted that the examples described below are exemplary and are only used to explain the present application, and should not be construed as limiting the present application. Where specific techniques or conditions are not specified in the examples, the techniques or conditions described in the literature in this area or the product specifications are used. Reagents or instruments used without manufacturer's indication are all commercially available conventional products.

[0071] Example 1

[0072] This embodiment provides a method for measuring the content of carbonate minerals, such as Figure 1 As shown, the specific steps include:

[0073] (1) Weigh 1.0 kg of the sample to be tested and grind it to a grinding fineness of -0.074 mm and a content of 70.0%;

[0074] (2) The ground sample was re-separated using a Nielsen re-separation device to obtain a re-separation tailing a1 with a re-separation yield d of 5.0%;

[0075] (3) Weigh 6.0 g of sample a1, mix epoxy resin and curing agent in a volume ratio of 1:2 to obtain epoxy resin glue, first crush sample a1 until there are no obvious agglomerated particles, mix it with epoxy resin glue in a mass ratio of 1:2, and then ultrasonically vibrate it for 30 minutes. After curing, cut it sideways and re-mount it. Then grind it with 74 μm, 23 μm and 15 μm diamond particles, respectively, and then polish it with 6 μm, 3 μm and 0.5 μm polishing materials, and then perform carbon spraying to obtain automatic mineralogical analysis sample a2;

[0076] (4) Automatic mineralogical analysis was performed on sample a2. The acceleration voltage was 25 kV, the beam spot diameter was 6.5 μm, and the magnification was 800 times. The particle size analysis results of calcium carbonate were measured and statistically analyzed. Figure 2 Take the minerals in as an example, and the content of the i-th carbonate mineral is measured as bi, i=1, 2, ..., n, n is the total number of carbonate minerals measured, see Table 1, where the sum of the carbonate mineral content is recorded as c, then c=∑bi=3.66%+1.24%+0.18%+0.05%=5.13%; the particle size of carbonate minerals is mainly less than 0.053mm;

[0077] (5) Weigh 50.0 g of gravity separation tailings sample a1, then add 200 mL of 10.0% dilute hydrochloric acid, react until no foaming occurs, then filter and dry to obtain sample a3;

[0078] (6) Weigh 5.0 g of sample a3 and add f1 g and f2 g of calcium carbonate respectively to obtain analytical comparison samples e1 and e2. The calcium carbonate content in samples e1 and e2 is 0.8 times and 1.2 times the sum of the carbonate mineral content c in sample a2, respectively. Then

[0079] f1 =4*c / (1-0.8*c)=4*5.13% / (1-0.8*5.13%)=0.2140g,

[0080] f2 =6*c / (1-1.2*c)=6*5.13% / (1-1.2*5.13%)=0.3280g;

[0081] (7) Analysis of comparative samples: Prepare samples for automatic mineralogical analysis according to the method in step (3) to obtain samples h1 and h2;

[0082] (8) Samples h1 and h2 were subjected to automatic mineralogical analysis according to the method in step (4). The total content of carbonate minerals was m1 = 4.21% and m2 = 6.18%, respectively.

[0083] (9) Calculate the correction factor k and the actual content C of carbonate minerals in sample a2, then c / C=m1 / 0.8c=m2 / 1.2c, C=2c 2 / (m1+m2), then k=2*c / (m1+m2)=2*5.13% / (4.21%+6.18%)=0.9875, C=c*k=5.13%*0.9875=5.066%;

[0084] (10) Calculate the actual content C' of carbonate minerals in the sample to be tested, then C' = C*(1-d) = 5.066%*(1-5%) = 4.813%.

[0085] The analysis results of the measured value bi, corrected value Bi and actual value Bi' of the carbonate minerals in this embodiment are shown in Table 1.

[0086] Table 1 Test and analysis results of carbonate mineral content

[0087]

[0088] Conventional testing of carbonate mineral content involves grinding the minerals and then performing automatic mineralogical measurements to obtain the carbonate mineral content.

[0089] The sample after grinding in step (1) of Example 1 was sampled and subjected to automatic mineralogical analysis, and the total content of carbonate minerals was found to be 4.874%, which was higher than the total content of carbonate minerals of 4.813% in Example 1. This was because in the actual measurement, the spectral peaks of silicon elements of some other types of silicate gangue minerals containing calcium and magnesium ions were inaccurately measured and were mistakenly identified as carbonate minerals, resulting in higher data results.

[0090] In summary, the present application provides a method for testing the content of carbonate minerals. The content of carbonate minerals in the ore sample is accurately measured through the steps of grinding, re-selection, preparation of automatic mineral analysis samples, acid treatment, preparation of analysis comparison samples, automatic mineralogical analysis testing and data correction. The present invention introduces analysis comparison sample correction, combines automatic mineralogical analysis data, and prepares analysis comparison samples in a targeted manner, so that the corrected sample is closer to the actual sample and more representative, thereby making the test data more accurate and providing reliable data support for the efficient use of such resources.

[0091] It should be noted that the present application 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 present application are all included in the technical scope of the present application. In addition, without departing from the scope of the present application, any 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 application.

Claims

1. A method for measuring the content of carbonate minerals, characterized in that: The following steps are involved: S1. Select the sample to be tested and grind it; S2. The ground sample is subjected to gravity separation to obtain gravity separation tailings a1, and the gravity separation yield is d; S3. Sampling the gravity tailings sample a1, preparing an automatic mineralogical analysis sample to obtain a sample a2; S4. Performing an automated mineralogical analysis on sample a2 to measure and compile the carbonate mineral particle size analysis results, and determining the content of the i-th carbonate mineral as bi, where the sum of the carbonate mineral contents is c, where c = ∑bi; i = 1, 2, ..., n, where n is the total number of carbonate mineral types measured; S5. The gravity separation tailings sample a1 was sampled, acid treated, filtered, and dried to obtain sample a3; S6. Sample jg of sample a3 is sampled, and then f1 g and f2 g of calcium carbonate are added, respectively, to obtain analytical comparison samples e1 and e2; wherein the calcium carbonate content in the analytical comparison samples e1 and e2 is g1 times and g2 times the sum of the carbonate mineral content c in sample a2, respectively; wherein the sampling amount jg of sample a3 is 3-7 g; g1 is 0.7-0.9, g2 is 1.1-1.3, and g1+g2=2; S7. The analysis comparison samples e1 and e2 are sampled and automatically prepared for mineralogical analysis, respectively, and are designated as h1 and h2; S8. Automated mineralogical analysis was performed on the samples h1 and h2, respectively, to determine the total contents of carbonate minerals m1 and m2, respectively; S9. Calculate the correction factor k and the actual content C of carbonate minerals in the sample a2: k=(g1+g2)*c / (m1+m2), C=c*k=k*∑bi; S10. Calculate the actual content C' of carbonate minerals in the sample to be tested: C'=C*(1-d).

2. The method for measuring the content of carbonate minerals according to claim 1, wherein: In step S1, the grinding fineness is -0.074 mm and the content is 65.0-75.0%.

3. The method for measuring the content of carbonate minerals according to claim 1, wherein: In step S2, the gravity separation is Nielsen gravity separation; the yield d of the gravity separation is 0.1-10.0%.

4. The method for measuring the content of carbonate minerals according to claim 1, wherein: In step S3, the preparation process of the automatic mineralogical analysis sample includes: sample rolling, glue mixing, ultrasonic vibration, side cutting after curing, secondary mounting, grinding and polishing, and carbon spraying; in the glue mixing, the glue is a mixture of epoxy resin glue and curing agent in a volume ratio of 1:2, and the mass ratio of the sample to the glue is 1:2; in the grinding and polishing, the size of the grinding material is not less than 13μm, and the grinding time is 10~12min; the size of the polishing material is not greater than 0.5μm, and the polishing time is 10~12min.

5. The method for measuring the content of carbonate minerals according to claim 1, wherein: In step S4, the acceleration voltage of the automatic mineralogical analysis test is 25 kV, the beam spot diameter is 6.5-7.0 μm, and the magnification is 300-1000 times.

6. The method for measuring the content of carbonate minerals according to claim 1, wherein: In step S5, the acid treatment agent is dilute hydrochloric acid, and the mass ratio of the dilute hydrochloric acid to the sample is 1:4; the temperature of the acid treatment is room temperature, and the endpoint of the acid treatment reaction is the reaction until there is no bubbling.

7. The method for measuring the content of carbonate minerals according to claim 1, wherein: In step S6, the particle size of the calcium carbonate is consistent with the measurement result of the carbonate mineral particle size distribution in step S4; and the purity of the calcium carbonate is greater than 99.99%.

8. The method for measuring the content of carbonate minerals according to claim 1, wherein: In step S7, the automatic mineralogical analysis preparation process and parameters of the analysis comparison samples e1 and e2 are consistent with those of sample a2 in step S3.

9. The method for measuring the content of carbonate minerals according to claim 1, wherein: In step S8, the analysis conditions and parameters of the automatic mineralogical analysis are consistent with those in step S4.

Images