A method for measuring the degree of dissociation of molybdenite

Abstract

The invention belongs to the technical field of process mineralogy, and in particular relates to a method for measuring the dissociation degree of molybdenite; the method comprises the following steps: ore grinding, classification, measuring the dissociation degree of monomers, converting the leakage length of molybdenite and intergrowths, calculating the intergrowth types and the like; the measurement of the invention is closer to the actual situation of molybdenite, combined with automatic mineralogical analysis, avoiding interference from artificial subjective factors, and the data is accurate.

Description

Technical Field

[0001] The invention belongs to the technical field of process mineralogy, and in particular relates to a method for measuring the dissociation degree of molybdenite. Background Art

[0002] Molybdenite is the main molybdenum ore resource. It is soft and slippery and is an important industrial raw material. Molybdenite belongs to the hexagonal crystal system and has a layered structure. It is usually produced in the form of flakes or scales.

[0003] Because of their good floatability, flaky minerals such as molybdenite can be recovered not only in monomeric state but also in part as intergrowths to float to the concentrate. This places high demands on the accurate measurement of the dissociation and intergrowth of molybdenite in order to provide accurate data for the mineral processing process.

[0004] In actual measurement, traditional measurement methods such as the area method or the intercept method cannot reflect the intergrowth situation well. This is because the surface of the flaky minerals is often perpendicular to or oblique to the flaky minerals, resulting in a small cross-sectional area. The premise of using the intercept method or the area method is to use the cross-sectional area or the intercept on the cross-sectional surface to represent the probability of the mineral's occurrence, which is not suitable for flaky minerals.

[0005] For flaky minerals such as molybdenite, due to their large specific surface area, large aspect ratio, and small cross-section, a suitable measurement method is needed. Summary of the invention

[0006] In order to solve the above problems, the present invention provides a method for measuring the dissociation degree of molybdenite, which has the advantages of being simple, accurate and reasonable, can effectively determine the dissociation of molybdenite, and provide accurate data support for the rational use of this type of ore resources.

[0007] A method for measuring the dissociation degree of molybdenite comprises the following steps:

[0008] Step 1: Grind the sample and screen the particle size into six particle sizes: larger than 0.074 mm, 0.074-0.053 mm, 0.053-0.037 mm, 0.037-0.020 mm, 0.020-0.010 mm and less than 0.010 mm. Record the yield of each particle size, denoted as a i , i = 1, 2, 3, 4, 5, 6, corresponding to the six particle sizes screened;

[0009] Step 2: Take samples from each particle size sample obtained in step 1, prepare them as automatic mineralogical analysis samples, and perform automatic mineralogical analysis to measure the monomer dissociation degree of molybdenite in each particle size sample, recorded as m i , then the proportion of molybdenite in the form of intergrowth and inclusion is 1-m i; At the same time, the area S of all molybdenite particles in each particle size sample that are intergrown or encapsulated is obtained p , the area S of the intergrowth or molybdenite vein minerals in each particle q ;

[0010] Step 3: Select w required intergrown or encapsulated molybdenite grains in each particle size sample, divide the intergrown and encapsulated molybdenite in each grain, and divide into b units according to the morphological characteristics of molybdenite and the degree of leakage and folding. The width of the middle part of each unit is recorded as c. b , and its average value is recorded as d, that is, d = (c1 + c2 + ... c b ) / b;

[0011] Step 4: according to the measured area S of the selected molybdenite particles that are intergrown or encapsulated p , calculate the length e of the molybdenite leakage in the corresponding particle that is intergrown or encapsulated, then e = S p / d;

[0012] Step 5: The area S of the gangue minerals of the intergrowth or molybdenite encapsulated in each selected particle is measured. q , calculate the leakage length f of the gangue minerals of the corresponding particle or the molybdenite encapsulated, then f = S q 1 / 2 ;

[0013] Step 6: Calculate the classification value z of the molybdenite type in each selected particle that is intergrown or encapsulated, where z = e*S p / (e*S p +f*S q );

[0014] Step 7, classify the selected w particles into h categories according to the z value;

[0015] Step 8: Calculate the value z of the molybdenite type in each particle of each particle size, and classify it into the corresponding type in step 7 according to the value z. The sum of the molybdenite areas in all particles of a certain type in a certain particle size that are intergrown or enclosed is recorded as S. ph , then the proportion of molybdenite in all particles of a certain type in this particle size that is intergrowth or encapsulated is recorded as g h , then g h =S ph / S 总 , where S 总 The sum of the areas of intergrown and enclosed molybdenite in all particles of this size class;

[0016] Step 9: The proportion of a certain type of molybdenite in the total sample that is intergrown or encapsulated is recorded as k, then k = ∑ai *g h *(1-m i );

[0017] Step 10: The proportion of molybdenite monomer in the total sample is n, then n = ∑a i *m i .

[0018] The division criterion for dividing the b units in step 3 is: taking the turning point and thickness mutation point of the intergrowth and encapsulated molybdenite as the division position, dividing the b units.

[0019] Beneficial effects of the present invention:

[0020] The present invention is easy to implement, practical, accurate in data, and can effectively measure the dissociation of molybdenite; specifically:

[0021] 1. This method is closer to the actual situation of molybdenite and the data is accurate;

[0022] 2. This method introduces the "leakage length", which is closer to the natural growth characteristics of various minerals;

[0023] 3. This method combines automatic mineralogical analysis, which provides accurate data, avoids human subjective factors, and saves workload. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings used in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0025] Figure 1 This is a reference figure of Example 1 of a specific embodiment of the present invention, the white part is molybdenite, and the black part is the intergrowth gangue mineral;

[0026] Figure 2 This is a schematic diagram of the intercept method measurement;

[0027] Figure 3 Schematic diagram of special packages, the white part is molybdenite and the black part is gangue;

[0028] Figure 4 This is a schematic diagram of the package state. The white part is molybdenite and the black part is gangue. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0030] Example 1

[0031] A method for measuring the dissociation degree of molybdenite comprises the following steps:

[0032] Step 1: Grind the sample and screen the particle size into six particle sizes: larger than 0.074 mm, 0.074-0.053 mm, 0.053-0.037 mm, 0.037-0.020 mm, 0.020-0.010 mm and less than 0.010 mm. Record the yield of each particle size, denoted as a i , i = 1, 2, 3, 4, 5, 6, corresponding to the six particle sizes screened;

[0033] Step 2, sampling from each particle size sample obtained in step 1, respectively preparing automatic mineralogical analysis samples, and performing automatic mineralogical analysis, measuring the monomer dissociation degree of molybdenite in each particle size sample, the monomer dissociation degree of molybdenite is recorded as mi, and the proportion of molybdenite in the state of intergrowth and inclusion is 1-mi; at the same time, the area Sp of all intergrowth or included molybdenite particles and the area Sq of intergrowth or included molybdenite vein minerals of each particle size sample are obtained;

[0034] Step 3: Select w required molybdenite grains in each particle size sample and study these molybdenite grains in each automatic mineralogical analysis sample, that is, divide the molybdenite grains in each particle into intergrowth and encapsulated grains. The corresponding molybdenite grains are mainly divided according to the morphological characteristics of molybdenite, with the degree of leakage and the degree of folding as the standard (see Figure 1 , divided into b units, the width of the middle of each unit is recorded as cb, and its average value is recorded as d, that is, d = (c1 + c2 + ... cb) / b; (cb is the width of the center of the unit perpendicular to the long axis of each unit)

[0035] Step 4: according to the area S of the molybdenite particles intergrowth or encapsulation measured in each selected particle, p , calculate the length e of the molybdenite leakage in the corresponding particle that is intergrown or encapsulated, then e = S p / d;

[0036] Leakage length e: In this method, it represents the ability of the leakage cross section of the molybdenite grain under study;

[0037] Step 5, according to the area Sq of the intergrowth or the gangue mineral encapsulating the molybdenite measured in each selected particle, calculate the leakage length f of the intergrowth or the gangue mineral encapsulating the molybdenite in the corresponding particle, then f=Sq1 / 2;

[0038] Leakage length f: In this method, it represents the ability of the leakage cross section of the gangue particles that are intergrowths and encapsulate molybdenite under study;

[0039] Step 6: Calculate the classification value z of the molybdenite type in each selected particle that is intergrown or encapsulated, where z = e*Sp / (e*S p +f*S q );

[0040] Step 7, classify the selected w particles into h categories according to the z value;

[0041] Step 8: Calculate the value z of the molybdenite type in each particle of each particle size, and classify it into the corresponding type in step 7 according to the value z. The sum of the molybdenite areas in all particles of a certain type in a certain particle size that are intergrown or enclosed is recorded as S. ph , then the proportion of molybdenite in all particles of a certain type in this particle size that is intergrown or encapsulated is recorded as g h , then g h =S ph / S 总 , where S 总 The sum of the areas of intergrown and enclosed molybdenite in all particles of this size class;

[0042] Step 9: The proportion of a certain type of molybdenite in the total sample that is intergrown or encapsulated is recorded as k, then k = ∑a i *g h *(1-m i );

[0043] Step 10: The proportion of molybdenite monomer in the total sample is n, then n = ∑a i *m i .

[0044] The division criterion for dividing the b units in step 3 is: taking the turning point and thickness mutation point of the intergrowth and encapsulated molybdenite as the division position, dividing the b units.

[0045] Step 1: The screening of several particle sizes can be adjusted by yourself. Generally, the particle size of flaky minerals such as molybdenite is small. Detailed classification of particle sizes will bring convenience to subsequent statistical work. The dissociation trend of target minerals of the same particle size is close, which is conducive to calculation and statistical work and saves workload.

[0046] Step 2, measuring the dissociation degree of molybdenite monomers in each particle size, where the molybdenite in a monomer state refers to the molybdenite that is not associated with other minerals around it, and the dissociation degree refers to the proportion of the molybdenite in a monomer state to the total amount of molybdenite in this particle size;

[0047] Step 2, the dissociation degree of molybdenite monomers in each particle size is measured. We mainly focus on non-monomer molybdenite, conduct detailed research on it, divide different intergrowths, and determine the process characteristics and parameters for recovering intergrowths;

[0048] Step 3, the division into b units is based on the part where the sheet-like minerals such as molybdenite are exposed outside the intergrowth, and different units are divided at the folds (bending parts) in order to obtain the average length of the short axis;

[0049] Step 3, the division unit, when molybdenite belongs to a special inclusion form ( Figure 3 ), the actual operation is to calculate the length of the side of the leaking part approximately, because the division unit is set on the leaking side, and the value of e after calculation is infinitely close to the side length;

[0050] Step 4: the area S of the molybdenite p It can be directly given in the automatic mineralogy testing software;

[0051] Step 4, the calculation of the leakage length of the molybdenite sheet mineral is to obtain an approximate real long axis length of the sheet mineral;

[0052] Step 5: the area S of the conjoined body q It can be directly given in the automatic mineralogy testing software;

[0053] Step 5, the calculation of the leakage length of the intergrown body is to obtain an approximate and true leakage length of the intergrown minerals;

[0054] Step 6: The corresponding conjoined body calculation type should take into account the volume characteristics of molybdenite and conjoined minerals, and introduce the area into the calculation;

[0055] Step seven, the intergrowth types are divided into h categories, which can be adjusted by oneself. When the concentrate product is measured by this method, detailed classification parameters can be determined, that is, specific values ​​are determined as boundaries to divide the floatable molybdenite.

[0056] Example 2

[0057] 1. Take an example of the specific calculation of conjoined bodies, as shown in the attached figure Figure 1 As shown, the white flake mineral is molybdenite, and the black one is the intergrowth mineral. p =102.36mm 2 , S q =51.78mm 2 ,

[0058] c1=1.88mm, c2=2.02mm, c3=2.72mm, c4=3.35mm,

[0059] Then d = (c1 + c2 + c3 + c4) / 4 = 2.49 mm,

[0060] Then e=S p / d=102.36 / 2.49=41.11mm,f=S q 1 / 2 =51.78 1 / 2 =7.20mm

[0061] Then e*S p / (e*S p +f*S q )=102.36*41.11 / (102.36*41.11+51.78*7.20)=0.92;

[0062] This mineral is a rich intergrowth and is an easily recoverable molybdenite intergrowth.

[0063] In contrast, if the intercept method and the area method are used, the data will be quite different. The corresponding calculations of the intercept method and the area method are as follows, which cannot truly reflect the true state of the flaky minerals.

[0064] like Figure 2 , intercept method: d1 / (d1+d2)=2.71 / (2.71+5.72)=0.32

[0065] Area method: S p / (S p +S q )=102.36 / (102.36+51.78)=0.66

[0066] 2. For example, the specific operation is as described above, and the screening particle size, yield, and measured dissociation degree and other data are shown in Table 1.

[0067] The intergrowths and inclusions in each sample were specifically measured and classified. The specific measurement and calculation methods are shown in the previous example, and the results are shown in Table 2.

[0068] The final data are shown in Table 3.

[0069] Table 1 Particle size screening and dissociation degree measurement results

[0070]

[0071]

[0072] Table 2 Analysis results of conjoined body measurements

[0073]

[0074] Table 3 Calculation of the dissociation degree of the original ore and the measurement results of the conjoined bodies

[0075]

[0076] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the protection scope of the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention. These simple variations all belong to the protection scope of the present invention.

[0077] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0078] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A method for measuring the degree of dissociation of molybdenite, characterized in that The following steps are involved: Step 1: Grind the sample and screen the particle size into six particle sizes: larger than 0.074 mm, 0.074-0.053 mm, 0.053-0.037 mm, 0.037-0.020 mm, 0.020-0.010 mm and less than 0.010 mm. Record the yield of each particle size, denoted as a i , i = 1, 2, 3, 4, 5, 6, corresponding to the six particle sizes screened; Step 2: Take samples from each particle size sample obtained in step 1, prepare them as automatic mineralogical analysis samples, and perform automatic mineralogical analysis to measure the monomer dissociation degree of molybdenite in each particle size sample, recorded as m i , then the proportion of molybdenite in the form of intergrowth and inclusion is 1-m i ; At the same time, the area S of all the intergrowths and encapsulated molybdenite particles in each particle size sample is obtained p , the area S of the intergrowth and the molybdenite vein minerals in each particle q ; Step 3: Select the required w intergrown and encapsulated molybdenite particles in each particle size sample, divide the intergrown and encapsulated molybdenite in each particle, and divide it into b units according to the morphological characteristics of molybdenite and the degree of leakage and folding. The width of the middle part of each unit is recorded as c. b , and its average value is recorded as d, that is, d = (c1 + c2 + ... c b ) / b; Step 4: according to the measured area S of the selected intergrowth and encapsulated molybdenite particles p , calculate the length e of the molybdenite leakage in the corresponding particle, which is intergrown and enclosed, then e = S p / d; the leakage length e represents the leakage cross-sectional capacity of the molybdenite particles; Step 5: According to the area S of the intergrowth and the gangue minerals encapsulating the molybdenite measured in each selected particle, q , calculate the leakage length f of the intergrowth and the gangue minerals encapsulating molybdenite in the corresponding particles, then f = S q 1 / 2 ; The leakage length f represents the leakage cross-section capacity of the gangue particles that are intergrown and encapsulate molybdenite; Step 6: Calculate the classification value z of the molybdenite type in each selected particle, where z = e*S p / (e*S p +f*S q ); Step 7, classify the selected w particles into h categories according to the z value; Step 8: Calculate the value z of the molybdenite type in each particle of each size class, and classify it into the corresponding type in step 7 according to the value z. The sum of the molybdenite areas in all particles of a certain type in a certain size class that are intergrown and enclosed is recorded as S. ph , then the proportion of molybdenite in all particles of a certain type in this particle size that is intergrown and encapsulated is recorded as g h , then g h =S ph / S 总 , where S 总 The sum of the areas of intergrown and enclosed molybdenite in all particles of this size class; Step 9: The proportion of a certain type of intergrowth and encapsulated molybdenite in the total sample is recorded as k, then k = ∑a i *g h *(1-m i ); Step 10: The proportion of molybdenite monomer in the total sample is n, then n = ∑a i *m i .

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