Measurement method of molybdenite content

Abstract

The present application provides a method for measuring the content of molybdenite, which belongs to the field of process mineralogy. The method comprises grinding the sample to be tested to a predetermined fineness range, sequentially performing gravity separation, magnetic separation and flotation operations on the sample after grinding, selecting high-purity molybdenite particles, preparing comparison samples with different molybdenite contents, analyzing the prepared comparison samples using automatic mineralogical analysis technology, obtaining molybdenite content data, and performing automatic mineralogical analysis on the sample to be tested. The molybdenite content data of the sample to be tested is obtained through data correction. The present application significantly improves the accuracy of the measurement data by introducing standard sample correction, and the standard sample can be reused, reducing material consumption and overall measurement costs. The calculation method is closer to the actual production situation, and the calculated data is accurate and has extremely small errors, while significantly saving the workload of measurement and calculation.

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 molybdenite. Background Art

[0002] Molybdenum is a very important rare metal element at present. With its special physical and chemical properties, especially the products with special nanostructures prepared by using it, it has broad application prospects in metallurgy, chemical industry, machinery, aerospace and biology. Although my country has abundant molybdenum ore resources, with the exploitation of molybdenum resources, molybdenite resources are gradually decreasing, which puts forward higher requirements for the beneficiation technology of molybdenum ore resources. As the working basis of beneficiation technology, process mineralogy research is also gradually developing towards refinement and high precision.

[0003] Molybdenite is the most important molybdenum sulfide mineral in nature, and more than 99% of molybdenum resources come from molybdenite. Research on molybdenite includes but is not limited to the determination of the material composition and content of each product, the determination of the dissociation degree of molybdenite monomers, and the determination of the particle size of molybdenite. Due to the existing automatic mineralogical analysis methods, the sample preparation method used is mostly the side cutting and inlaying method after mixing glue, which causes the molybdenite in the sample to have a special flaky shape, which is different from the granular or nearly granular shape of most minerals. When measuring the content of molybdenite, due to the special flaky, scaly, and curved folded shapes of molybdenite, errors in the measurement data are caused in the actual measurement process. Summary of the invention

[0004] In view of the technical problems existing in the background technology, the present application provides a method for measuring the content of molybdenite, aiming to solve the technical problem of large error when measuring the content of molybdenite.

[0005] The present application embodiment provides a method for measuring molybdenite content, comprising the following steps:

[0006] S1. Grind the sample to be tested to a fineness of -0.074 mm and a content of more than 65%, then add an inhibitor for gravity separation to obtain a gravity separation concentrate;

[0007] S2. performing magnetic separation on the gravity separation concentrate obtained in step S1 to obtain magnetic separation tailings;

[0008] S3. Adding a collector and a regulator to the magnetic tailings obtained in step S2 for flotation to obtain a flotation concentrate;

[0009] S4. Selecting the flotation concentrate obtained in step S3 to obtain high-purity molybdenite particles;

[0010] S5. Take the high-purity molybdenite particles obtained in step S4 and prepare comparative samples with different molybdenite contents, and the actual content is recorded as e i实际值, automatic mineralogical analysis is performed, and the test results are recorded as e i测量值 , where i is 1, 2, 3, ..., corresponding to the specific type of the comparison sample;

[0011] S6. Prepare the sample for automatic mineralogical analysis and perform automatic mineralogical analysis on the sample to be tested, and the result is recorded as h;

[0012] S7. Calculate the error ratio m i , where m i = e i实际值 / e i测量值 , i is 1, 2, 3..., corresponding to the specific type of the comparison sample;

[0013] S8. Determine the correction coefficient k using linear interpolation, then

[0014] k=m i +(m i+1 -m i )*(he i测量值 ) / (e （i+1）测量值 -e i测量值 );

[0015] S9. Correct the molybdenite content data of the sample to be tested, denoted as h', then h'=h*k.

[0016] In the technical solution of the embodiment of the present application, the purity of molybdenite particles is effectively improved through the steps of gravity separation, magnetic separation and flotation, thereby ensuring the accuracy of the measurement results. The automatic mineralogical analysis technology is adopted to improve the analysis speed and accuracy and reduce human errors. By calculating the error ratio m i , and the correction coefficient k is determined by linear interpolation method, which realizes real-time correction of measurement results and further improves measurement accuracy.

[0017] In some embodiments, the sample to be tested is quartz vein type molybdenite molybdenum ore. The inhibitor is water glass, and the addition amount is 0.05-0.1%.

[0018] In this embodiment, the inhibitor can effectively inhibit the flotation of gangue minerals such as quartz and improve the recovery rate of molybdenite.

[0019] In some embodiments, the magnetic field strength of the magnetic separation is ≥ 1.50 Tesla.

[0020] In this embodiment, a higher magnetic field strength can enhance the magnetic attraction of magnetic minerals, thereby improving the separation efficiency of molybdenite and non-magnetic gangue minerals during the magnetic separation process.

[0021] In some embodiments, the collector is kerosene, and the dosage is 0.20-0.25 kg / t; the adjuster is calcium oxide, and the pH value of the slurry is adjusted to 9-10.

[0022] In this embodiment, kerosene as a collector can effectively and selectively adsorb on the surface of molybdenite particles, enhance its floatability, and thus improve the recovery rate of molybdenite. Using calcium oxide as a regulator to adjust the pH value of the slurry between 9 and 10 can optimize the surface properties of the molybdenite particles, making it easier to combine with the collector, and also help to inhibit the flotation of gangue minerals, further improving the recovery rate of molybdenite.

[0023] In some embodiments, the molybdenite content of the high-purity molybdenite particles is ≥99.99%, and the control sample is a mixture of the high-purity molybdenite particles and quartz, and the purity of the quartz is ≥99.90%.

[0024] In this embodiment, the contents of high-purity molybdenite particles and quartz are controlled to ensure that the molybdenite component in the comparison sample has extremely high purity, thereby being able to accurately reflect the actual content of molybdenite in the sample to be tested.

[0025] In some embodiments, the steps and conditions for preparing the sample for automatic mineralogical analysis of the sample to be tested and the reference sample are the same, and the automatic mineralogical analysis conditions and parameter settings are consistent.

[0026] In this embodiment, the same processing and testing conditions for the samples are ensured during the analysis process, thereby avoiding analysis errors caused by differences in conditions.

[0027] 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

[0028] 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.

[0029] Figure 1 A flow chart of the method for measuring molybdenite content provided in this application. DETAILED DESCRIPTION

[0030] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0032] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0033] 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.

[0034] 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.

[0035] In the description of the embodiments of the present application, 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).

[0036] The existing automatic mineralogical analysis methods mostly use the method of side cutting and inlaying after mixing, which results in the special flaky shape of molybdenite in the sample, which is different from the granular or quasi-granular shape of most minerals. When measuring the content of molybdenite, due to the special flaky, scaly, and curved folded shape of molybdenite, errors in the measurement data are caused in the actual measurement process.

[0037] In order to solve the technical problem of large error in measuring molybdenite content, the present application provides a method for measuring molybdenite content, wherein the sample to be tested is ground to a predetermined fineness range, and the ground sample is subjected to gravity separation, magnetic separation and flotation operations in sequence, high-purity molybdenite particles are selected, and comparison samples with different molybdenite contents are prepared. The prepared comparison samples are analyzed using automatic mineralogical analysis technology to obtain molybdenite content data, and automatic mineralogical analysis is performed on the sample to be tested at the same time. Through data correction, the molybdenite content data of the sample to be tested is obtained. The present application significantly improves the accuracy of the measurement data by introducing standard sample correction, and the standard sample can be reused, reducing material consumption and reducing the overall measurement cost. This calculation method is closer to the actual production situation, and the calculated data is accurate and the error is extremely small, while significantly saving the workload of measurement and calculation.

[0038] Please refer to Figure 1 The present invention provides a method for measuring molybdenite content, comprising the following steps:

[0039] S1. Grind the sample to be tested to a fineness of -0.074 mm and a content of more than 65%, then add an inhibitor for gravity separation to obtain a gravity separation concentrate;

[0040] S2. performing magnetic separation on the gravity separation concentrate obtained in step S1 to obtain magnetic separation tailings;

[0041] S3. Adding a collector and a regulator to the magnetic tailings obtained in step S2 for flotation to obtain a flotation concentrate;

[0042] S4. Selecting the flotation concentrate obtained in step S3 to obtain high-purity molybdenite particles;

[0043] S5. Take the high-purity molybdenite particles obtained in step S4 and prepare comparative samples with different molybdenite contents, and the actual content is recorded as e i实际值 , automatic mineralogical analysis is performed, and the test results are recorded as e i测量值 , where i is 1, 2, 3, ..., corresponding to the specific type of the comparison sample;

[0044] S6. Prepare the sample for automatic mineralogical analysis and perform automatic mineralogical analysis on the sample to be tested, and the result is recorded as h;

[0045] S7. Calculate the error ratio m i , where m i = e i实际值 / e i测量值 , i is 1, 2, 3..., corresponding to the specific type of the comparison sample;

[0046] S8. Determine the correction coefficient k using linear interpolation, then

[0047] k=m i +(m i+1 -m i )*(he i测量值 ) / (e （i+1）测量值 -e i测量值 );

[0048] S9. Correct the molybdenite content data of the sample to be tested, denoted as h', then h'=h*k.

[0049] First, the sample to be tested is ground to a certain fineness and purity. This step ensures the uniformity and analyzability of the sample. Physical beneficiation methods such as gravity separation, magnetic separation and flotation can help remove impurities and improve the purity of molybdenite. The selected molybdenite particles are prepared into comparison samples with different molybdenite contents, and automatic mineralogical analysis is performed. The analysis results are used for subsequent data calibration. The correction coefficient is determined by linear interpolation, and the molybdenite content data of the sample to be tested is corrected according to the correction coefficient to correct the measurement error caused by the special morphology of molybdenite and improve the accuracy of the measurement results.

[0050] Further, in some embodiments, the sample to be tested is preferably a quartz vein type molybdenite molybdenum ore. Gravity separation can adopt Nelson gravity separation equipment, and the inhibitor in gravity separation is water glass, and the addition amount is preferably 0.05-0.1%.

[0051] In the technical solution of the embodiment of the present application, water glass is an inorganic colloid that has a good inhibitory effect on gangue minerals such as quartz. During the gravity separation process, water glass is adsorbed on the surface of gangue minerals to form a hydrophilic film, thereby reducing the floatability of gangue minerals, so that they are inhibited during flotation, while molybdenite is easier to float.

[0052] Furthermore, in some embodiments, the magnetic field strength of the magnetic separation is ≥ 1.50 Tesla.

[0053] In the technical solution of the embodiment of the present application, high magnetic field intensity magnetic separation can obtain purer molybdenite concentrate, which is beneficial to subsequent flotation and purity analysis, thereby improving the quality of the product.

[0054] Furthermore, in some embodiments, the collector in flotation is kerosene, and the dosage is 0.20-0.25 kg / t. The adjusting agent is calcium oxide, and the pH value of the pulp is adjusted to 9-10.

[0055] In the technical solution of the embodiment of the present application, kerosene, as an organic solvent, can be adsorbed on the surface of molybdenite particles to form a hydrophobic film, making it easier for the molybdenite particles to float during flotation. Calcium oxide can react with water to form calcium hydroxide, and further react with acidic substances in the pulp to increase the pH value of the pulp. This pH adjustment helps to improve the flotation performance of molybdenite particles, because molybdenite is more likely to form a stable hydrophobic surface at an alkaline pH value.

[0056] Furthermore, in some embodiments, the molybdenite content of the high-purity molybdenite particles is ≥ 99.99%. The control sample is a mixture of high-purity molybdenite particles and quartz, wherein the purity of the quartz is ≥ 99.90%.

[0057] In the technical solution of the embodiment of the present application, high-purity molybdenite selection refers to the manual selection of molybdenite mineral particles under a stereo microscope; the mixing ratio of molybdenite particles and quartz is determined according to actual needs and experimental conditions to ensure that the molybdenite content of the comparison sample can accurately reflect the molybdenite content in the sample to be tested.

[0058] Furthermore, in some embodiments, the steps and conditions for preparing the samples for automatic mineralogical analysis of the test samples and the control samples are the same, and the automatic mineralogical analysis conditions and parameter settings are consistent.

[0059] In the technical solution of the embodiment of the present application, the steps and conditions for preparing automatic mineralogical analysis samples for the test samples and the reference samples are the same, and the automatic mineralogical analysis conditions and parameter settings are consistent, ensuring that the sample processing and testing conditions are the same during the analysis process, thereby avoiding analysis errors caused by differences in conditions.

[0060] When calculating the correction factor k, select the nearest value e according to the value of h. i测量值 and e （i+1）测量值 Calculation is performed. In some embodiments, six groups of comparison samples are set, i.e., i is 1, 2, 3, 4, 5, and 6, and the corresponding actual molybdenite percentages are: 1.00%, 5.00%, 10.00%, 30.00%, 50.00%, and 70.00%, respectively. When h is less than 1.00%, e i测量值 and e （i+1）测量值 Take the measured values ​​corresponding to 1.00% and 5.00% respectively. When h is greater than 70.00%, e i测量值 and e （i+1）测量值 Take the measured values ​​corresponding to 50.00% and 70.00% respectively. When h is greater than 1.00% and less than 5.00%, e i测量值 and e （i+1）测量值 Take the measured values ​​corresponding to 1.00% and 5.00% respectively.

[0061] 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.

[0062] 1. Preparation method

[0063] Example 1

[0064] This embodiment provides a method for measuring molybdenite content, comprising the following steps:

[0065] S1. 10 kg of molybdenum ore containing molybdenite was selected and ground to a grinding fineness of -0.074 mm and a content of 70%; 10 g of water glass was then added for gravity separation, and the gravity separation yield was 0.10%, to obtain a gravity separation concentrate, recorded as a;

[0066] S2. Sample a is subjected to magnetic separation, and the magnetic separation yield is 80%, and magnetic separation tailings are obtained, which is recorded as c;

[0067] S3. Sample c was flotated by adding 0.20 kg / ton of kerosene and calcium oxide to adjust the slurry, adjusting the pH value to 9.5, and open-circuit flotation to obtain a flotation concentrate, recorded as d;

[0068] S4. Manually select high-purity molybdenite particles d' from sample d;

[0069] S5. Take high-purity molybdenite particles d' and prepare a comparative sample for automatic mineralogical analysis, denoted as e i (i is 1, 2, 3, 4, 5, 6, corresponding to the sample numbers of d'molybdenite 0.02g + quartz 1.98g, d'molybdenite 0.10g + quartz 1.90g, d'molybdenite 0.20g + quartz 1.80g, d'molybdenite 0.60g + quartz 1.40g, d'molybdenite 1.00g + quartz 1.00g, d'molybdenite 1.40g + quartz 0.60g);

[0070] S6. Prepare samples for automatic mineralogical analysis of the samples to be tested;

[0071] S7. Automatic mineralogical analysis of the tested samples and the comparative samples. Detailed data are shown in Table 1.

[0072] S8. Calculate the error ratio m i , i is 1, 2, 3, 4, 5, 6, where m i = e i实际值 / e i测量值 , detailed data are shown in Table 1;

[0073] S9. Use linear interpolation to determine the correction coefficient k, then k=m i +(m i+1 -m i )*(he i测量值 ) / (e （i+1）测量值 -e i测量值 )=0.83+(0.77-0.83)*(6.33-6.00) / (13.00-6.00)=0.8272;

[0074] S10. Correct the molybdenite content data of sample h, denoted as h', then h'=h*k=6.33%*0.8272=5.24%.

[0075]

[0076] Example 2

[0077] This embodiment provides a method for measuring molybdenite content, comprising the following steps:

[0078] S1. 10 kg of molybdenum ore containing molybdenite was selected and ground to a grinding fineness of -0.074 mm and a content of 80%; 5 g of water glass was then added for gravity separation, and the gravity separation yield was 0.10%, to obtain a gravity separation concentrate, recorded as a;

[0079] S2. Magnetic separation is performed on sample a, and the magnetic separation yield is 15%, and magnetic separation tailings are obtained, which is recorded as c;

[0080] S3. Sample c was flotated by adding 0.20 kg / ton of kerosene and calcium oxide to adjust the slurry, adjusting the pH value to 9.5, and open-circuit flotation to obtain a flotation concentrate, recorded as d;

[0081] S4. Manually select high-purity molybdenite particles d' from sample d;

[0082] S5. Take high-purity molybdenite particles d' and prepare a comparative sample for automatic mineralogical analysis, denoted as e i (i is 1, 2, 3, 4, 5, 6, corresponding to the sample numbers of d'molybdenite 0.02g + quartz 1.98g, d'molybdenite 0.10g + quartz 1.90g, d'molybdenite 0.20g + quartz 1.80g, d'molybdenite 0.60g + quartz 1.40g, d'molybdenite 1.00g + quartz 1.00g, d'molybdenite 1.40g + quartz 0.60g);

[0083] S6. Prepare samples for automatic mineralogical analysis of the samples to be tested;

[0084] S7. Automatic mineralogical analysis of the tested samples and the comparative samples. Detailed data are shown in Table 2.

[0085] S8. Calculate the error ratio m i , i is 1, 2, 3, 4, 5, 6, where m i = e i实际值 / e i测量值 , detailed data are shown in Table 2;

[0086] S9. Use linear interpolation to determine the correction coefficient k, then k=m i +(m i+1 -m i )*(he i测量值 ) / (e （i+1）测量值 -e i测量值 )=1.05+(1.01-1.05)*(0.82-0.95) / (4.96-0.95)=1.0513;

[0087] S10. Correct the molybdenite content data of sample h, denoted as h', then h'=h*k=0.82%*1.0513=0.86%.

[0088]

[0089] II. Analysis of test results of various embodiments

[0090] It can be seen from Table 1 to Table 2 that in the technical solution of the embodiment of the present application, the purity of the molybdenite particles is effectively improved through the steps of gravity separation, magnetic separation and flotation, thereby ensuring the accuracy of the measurement results. The use of automatic mineralogical analysis technology improves the analysis speed and accuracy and reduces human errors. By calculating the error ratio m i , and the correction coefficient k is determined by linear interpolation method, which realizes the real-time correction of the measurement results and further improves the measurement accuracy.

[0091] In summary, the present invention provides a method for measuring the content of molybdenite, which measures the mineral content by combining gravity separation, magnetic separation and flotation processes with automatic mineralogical analysis, realizes the correction calculation of the molybdenite content, and obtains accurate measurement results. The calculation method is closer to the actual production situation, and the calculated data is accurate and the error is extremely small, while significantly saving the workload of measurement and calculation.

[0092] 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 molybdenite content, characterized in that: The following steps are involved: S1. Grind the sample to be tested to a fineness of -0.074 mm and a content of more than 65%, then add an inhibitor for gravity separation to obtain a gravity separation concentrate; S2. performing magnetic separation on the gravity separation concentrate obtained in step S1 to obtain magnetic separation tailings; S3. Adding a collector and a regulator to the magnetic tailings obtained in step S2 for flotation to obtain a flotation concentrate; S4. Selecting the flotation concentrate obtained in step S3 to obtain high-purity molybdenite particles; S5. Take the high-purity molybdenite particles obtained in step S4 and prepare comparative samples with different molybdenite contents, and the actual content is recorded as e i实际值 , automatic mineralogical analysis is performed, and the test results are recorded as e i测量值 , where i is 1, 2, 3, ..., corresponding to the specific type of the comparison sample; S6. Prepare the sample for automatic mineralogical analysis and perform automatic mineralogical analysis on the sample to be tested, and the result is recorded as h; S7. Calculate the error ratio m i , where m i = e i实际值 / e i测量值 , i is 1, 2, 3..., corresponding to the specific type of the comparison sample; S8. Determine the correction coefficient k using linear interpolation, then k=m i +(m i+1 -m i )*(he i测量值 ) / (e （i+1）测量值 -e i测量值 ), select the nearest e according to the value of h i测量值 and e （i+1）测量值 Perform calculations; S9. Correct the molybdenite content data of the sample to be tested, denoted as h', then h'=h*k.

2. The method for measuring molybdenite content according to claim 1, characterized in that: In step S1, the sample to be tested is quartz vein type molybdenite molybdenum ore.

3. The method for measuring molybdenite content according to claim 2, characterized in that: The inhibitor is water glass, and the addition amount is 0.05-0.1%.

4. The method for measuring molybdenite content according to claim 1, characterized in that: In step S2, the magnetic field strength of the magnetic separation is ≥1.50 Tesla.

5. The method for measuring molybdenite content according to claim 1, characterized in that: In step S3, the collector is kerosene, and the amount used is 0.20-0.25 kg / t.

6. The method for measuring the molybdenite content according to claim 5, characterized in that: The adjusting agent is calcium oxide, which is used to adjust the pH value of the slurry to 9-10.

7. The method for measuring molybdenite content according to claim 1, characterized in that: In step S4, the molybdenite content of the high-purity molybdenite particles is ≥99.99%.

8. The method for measuring molybdenite content according to claim 1, characterized in that: In step S5, the comparison sample is a mixture of the high-purity molybdenite particles and quartz.

9. The method for measuring the molybdenite content according to claim 8, characterized in that: The purity of the quartz is ≥99.90%.

10. The method for measuring the molybdenite content according to claim 1, characterized in that: The steps and conditions for preparing the automatic mineralogical analysis samples of the sample to be tested and the reference sample are the same, and the automatic mineralogical analysis conditions and parameter settings are consistent.

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