Method for measuring content of carbonate minerals

Abstract

The invention provides a method for measuring the content of carbonate minerals, and belongs to the technical field of process mineralogy. The method for measuring the content of the carbonate minerals comprises the steps of ore grinding, reselection, automatic mineral analysis sample preparation, acid treatment, analysis comparison sample preparation, automatic mineralogy analysis testing, data correction and the like. Compared with the prior art, the analysis comparison sample is prepared in a targeted manner by introducing the analysis comparison sample for correction and combining automatic mineralogy analysis data, so that the analysis comparison sample is closer to an actual sample and is more representative, the test data is more accurate, and reliable data support is provided for efficient utilization 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+ etc., are distributed in a variety of ores. They are one of the most widely distributed minerals in the earth's crust and have important economic and scientific value. The content of carbonate minerals is of great significance to the utilization of ore resources. Ore types with different carbonate mineral contents have different effects on the ore dressing process. For example, in the flotation process, carbonate minerals are not wear-resistant and are easily finely ground after grinding, resulting in a smaller particle size. Fine-grained carbonate minerals are easy to float to the concentrate during the flotation process, affecting the quality of the flotation concentrate. In the acid leaching process, carbonate minerals are acid-consuming minerals, and their content directly affects the amount of acid leaching reagents. In addition, Carlin-type gold deposits are a type of gold deposit related to hydrothermal activity, mainly distributed in sedimentary rocks such as carbonate rocks, fine clastic rocks and siliceous rocks. The gold in this deposit exists at the micron or even nanometer level, usually dispersed in sulfide minerals (such as pyrite, arsenopyrite) or carbonate minerals. Carlin-type gold deposits have attracted much attention worldwide for their unique geological characteristics and economic value. All these put forward higher requirements for the measurement of carbonate minerals.

[0003] At present, when using automatic mineralogical analysis, the content of carbonate minerals is often inaccurate. On the one hand, in the process of automatic mineralogical analysis, carbon spraying is required in the specific sample preparation process, which makes the surface of the analyzed sample conductive and can recognize images without accumulating charges. This makes it difficult to distinguish the sprayed carbon from the carbon in the sample itself (carbon in carbonate minerals) during the actual measurement process. At the same time, the minerals also contain graphite and other types of carbon-containing minerals. In addition, when the content of other elements is low due to various reasons, it will also lead to misidentification as carbonate minerals.

[0004] In the prior art, a method for measuring molybdenite content is provided in the patent with publication number CN118896887B, which grinds the sample to be tested to a predetermined fineness range, performs gravity separation, magnetic separation and flotation operations on the sample after grinding in turn, selects high-purity molybdenite particles, prepares comparison samples with different molybdenite contents, analyzes the prepared comparison samples using automatic mineralogical analysis technology, obtains molybdenite content data, and performs automatic mineralogical analysis on the sample to be tested at the same time, obtains molybdenite content data of the sample to be tested through data correction. However, this method is a purposeless standard sample preparation, and 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, and the test results are not accurate enough. The patent with 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 carry out a first reaction to obtain a gas product containing carbon dioxide; (2) passing the obtained gas product containing carbon dioxide into an excess of alkali solution under closed conditions for a second reaction until no bubbles are generated in the alkali solution, thereby obtaining a solution containing soluble carbonates; (3) using a TOC analyzer to detect the inorganic carbon content in the solution containing soluble carbonates; (4) calculating the carbonate content in the desulfurized gypsum based on the obtained inorganic carbon content. This invention uses a chemical method to measure the mineral content. This method may have problems such as incomplete dissolution and cross-phase dissolution, and there are many factors affecting the determination, which has high requirements for operation and 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, aiming 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: S1. Select the sample to be tested and grind it; S2. The sample after grinding is re-selected to obtain a re-selection tailing a1, and the re-selection yield is d; S3. Sampling the gravity separation tailings sample a1, preparing an automatic mineralogical analysis sample to obtain a sample a2; S4. Perform automatic mineralogical analysis on the sample a2, measure and count the results of carbonate mineral particle size analysis, and measure the content of the i-th carbonate mineral as bi, where the sum of the carbonate mineral contents is c, then c=∑bi; i=1, 2, ..., n, where n is the total number of carbonate mineral types measured; S5. Sampling the gravity separation tailings sample a1, acid treatment, filtering and drying to obtain sample a3; S6. Sample jg of the sample a3 were taken, and then f1 g and f2 g of calcium carbonate were added, respectively, to obtain analytical comparison samples e1 and e2; wherein the content of calcium carbonate in the analytical comparison samples e1 and e2 was g1 times and g2 times the sum of the carbonate mineral content c in the sample a2, respectively; S7. Sampling the analysis comparison samples e1 and e2, respectively, to prepare automatic mineralogical analysis samples, denoted as h1 and h2; S8. The samples h1 and h2 were subjected to automatic mineralogical analysis, and the total contents of carbonate minerals were measured to be m1 and m2, respectively; S9. Calculate the correction coefficient 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).

[0007] In the technical solution of the embodiment of the present application, the present application accurately measures the content of carbonate minerals in the ore sample through the steps of grinding, reselection, preparing automatic mineral analysis samples, acid treatment, preparing analysis comparison samples, automatic mineralogical analysis test 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.

[0008] In some embodiments, in step S1, the grinding fineness is -0.074 mm and the content is 65.0~75.0%.

[0009] In this embodiment, the sample to be tested is ground to a certain fineness to facilitate the subsequent processing of the sample.

[0010] 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%.

[0011] In this embodiment, carbonate minerals are enriched in the gravity separation tailings through gravity separation, while the interference of heavy minerals during testing is eliminated.

[0012] 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 abrasive is not less than 13μm, and the grinding time is 10~12min; the size of the polishing material is not more than 0.5μm, and the polishing time is 10~12min.

[0013] In this embodiment, the gravity separation tailings are made into automatic mineralogical analysis samples, and then the automatic mineralogical analysis is performed.

[0014] 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.

[0015] 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 and makes the analytical comparison samples closer to the original ore.

[0016] 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.

[0017] 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 comparative analysis samples.

[0018] 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%.

[0019] In this embodiment, the particle size of calcium carbonate added to the analytical comparison sample is consistent with the measurement 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.

[0020] 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.

[0021] In this embodiment, a certain amount of calcium carbonate is added to the acid-treated sample a3, so that the component content and structure of the obtained analytical comparison sample are similar to those of the original ore. The content of calcium carbonate in the analytical comparison samples e1 and e2 is set to a specific multiple of the sum of the carbonate mineral contents in the sample a2, so as to facilitate the calculation of the amount of calcium carbonate added. At the same time, g1 and g2 can be tested within a specific range, and the calcium carbonate content can be tested within a range greater than or less than that of the sample a2, so that the amount of calcium carbonate added will not be too little or too much, which will affect the accuracy of the test and the representativeness of the sample, and more sufficient correction data can be obtained.

[0022] 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.

[0023] In this embodiment, 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.

[0024] 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

[0025] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings used in the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 This is a flow chart of the method for measuring the carbonate mineral content in Example 1.

[0027] 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

[0028] The following is a detailed description of the embodiments of the technical solution of the present application. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0029] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0030] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0031] 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.

[0032] The present application provides a method for measuring the content of carbonate minerals, comprising the following steps: S1. Select the sample to be tested and grind it; S2. The sample after grinding is re-selected to obtain a re-selection tailing a1, and the re-selection yield is d; S3. Sampling the gravity separation tailings sample a1, preparing an automatic mineralogical analysis sample to obtain a sample a2; S4. Perform automatic mineralogical analysis on the sample a2, measure and count the results of carbonate mineral particle size analysis, and measure the content of the i-th carbonate mineral as bi, where the sum of the carbonate mineral contents is c, then c=∑bi; i=1, 2, ..., n, where n is the total number of carbonate mineral types measured; S5. Sampling the gravity separation tailings sample a1, acid treatment, filtering and drying to obtain sample a3; S6. Sample jg of the sample a3 were taken, and then f1 g and f2 g of calcium carbonate were added, respectively, to obtain analytical comparison samples e1 and e2; wherein the content of calcium carbonate in the analytical comparison samples e1 and e2 was g1 times and g2 times the sum of the carbonate mineral content c in the sample a2, respectively; S7. Sampling the analysis comparison samples e1 and e2, respectively, to prepare automatic mineralogical analysis samples, denoted as h1 and h2; S8. The samples h1 and h2 were subjected to automatic mineralogical analysis, and the total contents of carbonate minerals were measured to be m1 and m2, respectively; S9. Calculate the correction coefficient 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; S10. Calculate the actual content C' of carbonate minerals in the sample to be tested: C'=C*(1-d).

[0033] In the technical solution of the embodiment of the present application, the content of carbonate minerals in the ore sample is accurately measured through the steps of grinding, reselection, preparation of automatic mineral analysis samples, acid treatment, preparation of analysis comparison samples, automatic mineralogical analysis test 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.

[0034] Furthermore, in some embodiments, in step S1, the grinding fineness is -0.074 mm and the content is 65.0-75.0%.

[0035] In the technical solution of the embodiment of the present application, by grinding the sample to be tested to a certain fineness, it is convenient for the subsequent processing of the sample.

[0036] 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%.

[0037] 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.

[0038] 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 abrasive 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.

[0039] 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.

[0040] 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.

[0041] In the technical solution of the embodiment of the present application, the particle size analysis results of carbonate minerals are obtained by performing automatic mineralogical analysis on the gravity separation tailings samples, which provides a basis for the subsequent preparation of analytical comparison samples and makes the analytical comparison samples closer to the original ore.

[0042] 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 there is no bubbling.

[0043] 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 to prepare for the subsequent preparation of analysis comparison samples.

[0044] 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%.

[0045] 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.

[0046] 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.

[0047] In this embodiment, a certain amount of calcium carbonate is added to the acid-treated sample a3, so that the component content and structure of the obtained analytical comparison sample are similar to those of the original ore. The content of calcium carbonate in the analytical comparison samples e1 and e2 is set to a specific multiple of the sum of the carbonate mineral contents in the sample a2, so as to facilitate the calculation of the amount of calcium carbonate added. At the same time, g1 and g2 can be tested within a specific range, and the calcium carbonate content can be tested within a range greater than or less than that of the sample a2, so that the amount of calcium carbonate added will not be too little or too much, which will affect the accuracy of the test and the representativeness of the sample, and more sufficient correction data can be obtained.

[0048] 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.

[0049] 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.

[0050] Some specific embodiments are listed below. It should be noted that the embodiments described below are exemplary and are only used to explain the present application, and should not be construed as limiting the present application. If specific techniques or conditions are not specified in the embodiments, the techniques or conditions described in the literature in this area or the product specifications are used. The reagents or instruments used without specifying the manufacturer are all conventional products that can be obtained commercially.

[0051] Example 1 This embodiment provides a method for measuring the content of carbonate minerals. Figure 1 As shown, the specific steps include: (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%; (2) The ground sample is re-separated using a Nelson re-separation device to obtain a re-separation tailing a1, with a re-separation yield d of 5.0%; (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 roll sample a1 until there are no obvious agglomerated particles, mix with epoxy resin glue in a mass ratio of 1:2, and then ultrasonically vibrate for 30 minutes. After curing, cut sideways and re-embed, grind with 74 μm, 23 μm and 15 μm diamond particles respectively, and then polish with 6 μm, 3 μm and 0.5 μm polishing materials, and then perform carbon spraying to obtain automatic mineralogical analysis sample a2; (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 measure the content of the i-th carbonate mineral 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; (5) Weigh 50.0 g of gravity separation tailings sample a1, then add 200 mL of 10.0% volume concentration dilute hydrochloric acid, react until no foaming occurs, then filter and dry to obtain sample a3; (6) Weigh 5.0 g of sample a3, add f1 g and f2 g of calcium carbonate respectively, and 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 f1 =4*c / (1-0.8*c)=4*5.13% / (1-0.8*5.13%)=0.2140g, f2 =6*c / (1-1.2*c)=6*5.13% / (1-1.2*5.13%)=0.3280g; (7) Analysis of comparative samples: Prepare samples for automatic mineralogical analysis according to the method in step (3) to obtain samples h1 and h2; (8) Samples h1 and h2 were subjected to automatic mineralogical analysis according to the method in step (4), and the total content of carbonate minerals was m1 = 4.21% and m2 = 6.18%, respectively; (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%; (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%.

[0052] The analysis results of the measured value bi, the corrected value Bi and the actual value Bi' of the carbonate minerals in this embodiment are shown in Table 1.

[0053] Table 1 Test and analysis results of carbonate mineral content Conventional testing of carbonate mineral content is to grind the minerals and then directly perform automatic mineralogical measurements to obtain the carbonate mineral content.

[0054] 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 obtained to be 4.874%, which is higher than the total content of carbonate minerals of 4.813% in Example 1. This is because in actual measurement, the spectral peak measurement of silicon element of some other types of silicate gangue minerals containing calcium and magnesium ions is inaccurate, and they are mistakenly identified as carbonate minerals, resulting in high data results.

[0055] 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 test 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.

[0056] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and the embodiments having the same structure as the technical idea and exerting the same effect within the scope of the technical solution of the present application are all included in the technical scope of the present application. In addition, without departing from the scope of the main purpose of the present application, various modifications that can be thought of by those skilled in the art to the embodiments and other methods of combining some of the constituent elements in the embodiments are also included in the scope of the present application.

Claims

1. A method for measuring the content of carbonate minerals, characterized in that: The following steps are involved: S1. Select the sample to be tested and grind it; S2. The sample after grinding is re-selected to obtain a re-selection tailing a1, and the re-selection yield is d; S3. Sampling the gravity separation tailings sample a1, preparing an automatic mineralogical analysis sample to obtain a sample a2; S4. Perform automatic mineralogical analysis on the sample a2, measure and count the results of carbonate mineral particle size analysis, and measure the content of the i-th carbonate mineral as bi, where the sum of the carbonate mineral contents is c, then c=∑bi; i=1, 2, ..., n, where n is the total number of carbonate mineral types measured; S5. Sampling the gravity separation tailings sample a1, acid treatment, filtering and drying to obtain sample a3; S6. Sample jg of the sample a3 were taken, and then f1 g and f2 g of calcium carbonate were added, respectively, to obtain analytical comparison samples e1 and e2; wherein the content of calcium carbonate in the analytical comparison samples e1 and e2 was g1 times and g2 times the sum of the carbonate mineral content c in the sample a2, respectively; S7. Sampling the analysis comparison samples e1 and e2, respectively, to prepare automatic mineralogical analysis samples, denoted as h1 and h2; S8. The samples h1 and h2 were subjected to automatic mineralogical analysis, and the total contents of carbonate minerals were measured to be m1 and m2, respectively; S9. Calculate the correction coefficient 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, characterized in that: 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, characterized in that: 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, characterized in that: 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 abrasive is not less than 13μm, and the grinding time is 10~12min; the size of the polishing material is not more than 0.5μm, and the polishing time is 10~12min.

5. The method for measuring the content of carbonate minerals according to claim 1, characterized in that: 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, characterized in that: 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, characterized in that: 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 step S4; the purity of the calcium carbonate is above 99.99%.

8. The method for measuring the content of carbonate minerals according to claim 1, characterized in that: In step S6, the sampling amount jg of the sample a3 is 3-7 g; the g1 is 0.7-0.9, the g2 is 1.1-1.3, and g1+g2=2.

9. The method for measuring the content of carbonate minerals according to claim 1, characterized in that: 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.

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

Images