A binary system gold ore gold-bearing mineral gold content determination method

Abstract

The invention belongs to the technical field of process mineralogy, and in particular relates to a method for determining the gold content of gold-bearing minerals in a binary system gold ore; the method comprises the following steps: ore grinding, re-selection, heavy tail flotation, automatic mineralogical analysis of heavy fine samples, grade conversion, material composition conversion, elimination of unreasonable data, curve fitting, obtaining gold content data of gold-bearing minerals, and the like; the method is beneficial to the quantitative work of the gold content of gold-bearing minerals in gold ore, has reasonable operation, and accurate data.

Description

Technical Field

[0001] The invention belongs to the technical field of process mineralogy, and in particular relates to a method for determining the gold content of gold-bearing minerals in a binary system gold ore. Background Art

[0002] Gold is widely needed in various fields due to its incomparable physical and chemical properties, and the study of gold has always been a hot topic and a difficult point. For process mineralogy research, the occurrence state of gold is an important research content, especially the analysis of the gold content of gold-bearing minerals, which is directly related to the gold grade and recovery rate of mineral processing products. However, traditional chemical leaching tests can only give the proportion of gold encapsulated or inter-generated gold in sulfides, and cannot directly reflect the difference in gold content of which sulfides. In addition, manual selection of single minerals can be used for gold grade analysis, but this method is time-consuming and labor-intensive, and has a large subjective influence on people, and the analysis results are not very satisfactory.

[0003] There are also related technologies that introduce the gold content measurement method of gold-bearing minerals with concentrate as the research object. First of all, taking concentrate as the research object is putting the cart before the horse. The reasonable research object should be the original ore. The concentrate is different from the original ore, and the concentrate after selection is not representative. Secondly, the treatment of monomer gold minerals in the steps described in the previous patents mainly relies on the method of gold leaching, which not only discharges the monomer gold but also discards the inter-growth gold. This is problematic, such as whether the coarse-grained gold can be effectively treated. For example, the sulfide inter-growth gold is also treated during the gold leaching process. This part of the inter-growth state gold happens to be gold carried by the carrier mineral, and it cannot be directly operated in this way, which will make the results low to varying degrees. In addition, even the concentrate has more or less gangue content. The previous patents did not consider this problem. Gangue will "dilute" the grade of the concentrate. The directly obtained results cannot directly reflect the gold grade of the gold-bearing mineral, and the data is often erroneous.

[0004] Generally speaking, gold-bearing minerals in gold ore resources are mostly single or binary metal sulfides, such as "pyrite + arsenopyrite" type ores, and "pyrite + chalcopyrite" type ores. We pay more attention to the gold content in different gold-bearing minerals in order to provide data guidance for the subsequent mineral processing process. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a method for determining the gold content of gold-bearing minerals in binary gold ore, which is simple, accurate and reasonable; it can effectively determine the gold content of gold-bearing minerals in binary gold ore, and provide accurate data support for the rational use of this type of ore resources.

[0006] A method for determining the gold content of gold-bearing minerals in a binary system gold ore comprises the following steps:

[0007] Step 1, grinding the sample to be tested to a fineness of 200 mesh and a content of 70%, recorded as sample a;

[0008] Step 2: Perform the first gravity selection on sample a, discard the concentrate obtained after gravity selection, take the tailings for the second gravity selection, and record the gravity selection concentrate yield as c1. Perform the third gravity selection on the tailings, and record the gravity selection concentrate yield as c2. Perform the fourth gravity selection on the tailings, and record the gravity selection concentrate yield as c3. Perform the fifth gravity selection on the tailings, and record the gravity selection concentrate yield as c4. Perform the sixth gravity selection on the tailings, and record the gravity selection concentrate yield as c5. The gravity selection tailings are recorded as w1. The gravity selection concentrates obtained from the second gravity selection to the sixth gravity selection are recorded as b. i , i is 2, 3, 4, 5, 6;

[0009] Step 3, finely grinding the gravity separation tailings w1 until the fineness is 200 meshes and all pass through to obtain sample w2;

[0010] Step 4, 500 g of sample w2 is sampled, slurry is prepared, copper sulfate, butyl xanthate and MIBC are added respectively for open circuit flotation, the flotation tailings are recorded as w3, and the flotation tailings yield is recorded as h;

[0011] Step 5: Gravity separation of concentrate b i The gold grade of each sample is measured and recorded as d i ;

[0012] Step 6, sampling the flotation tailings w3 to analyze the gold grade, recorded as d6;

[0013] Step 7: Gravity separation of concentrate b i Take samples to make MLA samples, denoted as h i ;

[0014] Step 8: MLA sample h i Automatic mineralogical analysis was performed to obtain h i The content of pyrite, arsenopyrite and gangue minerals in the medium is recorded as e i 1. e i 2. e i 3;

[0015] Step 9: Gravity separation of concentrate b i The gold grade is converted into data, and the re-selected concentrate b i The gold grade after conversion is recorded as f i , the grade conversion formula is: f i =(d i -d i *e i 3) / (1-e i 3);

[0016] Step 10: convert the data of pyrite and arsenopyrite mineral contents, where the pyrite and arsenopyrite conversion contents are recorded as g i 1. g i 2. The conversion formula is: g i 1=e i 1 / (e i 1+e i 2) g i 2=e i 2 / (e i 1+e i 2);

[0017] Step 11, taking the conversion content of arsenopyrite or pyrite as the horizontal coordinate, the gravity separation concentrate b i Gold grade after conversion i As the vertical axis, fit the linear trend line and remove unreasonable data;

[0018] Step 12: After removing the data, refit the curve based on the new data to obtain the linear formula y=kx+m, where y=f i , x = g i 1 or g i 2;

[0019] Step 13, setting special parameters to obtain the gold content of arsenopyrite or pyrite, in g / t; where x=1, then y=k+mg / t, and the gold content of arsenopyrite or pyrite is k+mg / t; where x=0, then y=mg / t, and the gold content of arsenopyrite or pyrite is mg / t.

[0020] In the step 1, sample a is reselected and the yield is controlled to be less than or equal to 0.01%.

[0021] Beneficial effects of the present invention:

[0022] The invention is easy to implement and reasonable, avoids the time-consuming and laborious manual selection of heavy sand, eliminates the influence of subjective factors, provides accurate data, and can effectively determine the gold content of gold-bearing minerals.

[0023] 1. The physical method is used to eliminate the interference of single-state gold particles, which is more reasonable and completely retains the inter-growth gold. The data directly reflects the gold content of the carrier mineral, that is, the two parts of the encapsulated gold and the inter-growth gold, which is close to the actual production;

[0024] 2. Multi-step gravity separation is adopted to obtain multiple gravity separation concentrate products, which can obtain differentiated products with clearer distinction and more reliable data;

[0025] 3. The flotation tailings are introduced as a data calibration method to obtain the true concentrate mineral composition and grade. The fitting curve is a true linear curve, which can determine the true relevant data;

[0026] 4. Automatic mineralogical analysis of each concentrate sample is more accurate than manual microscopic classification of mineral content;

[0027] 5. Multiple fitting data make the data more representative. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] 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 creative work.

[0029] Figure 1 It is a flow chart of the present invention.

[0030] Figure 2 This is a schematic diagram of the fitted linear trend line in Example 2 of the present invention.

[0031] Figure 3 It is a schematic diagram of refitting the curve according to new data in Example 2 of the present invention. DETAILED DESCRIPTION

[0032] 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.

[0033] Example 1

[0034] A method for determining the gold content of gold-bearing minerals in a binary system gold ore comprises the following steps:

[0035] Step 1: Take 5 kg of the sample to be tested and grind it to a fineness of 200 mesh (-0.074 mm) and a content of 70%, which is recorded as sample a;

[0036] Step 2: Perform the first gravity separation on sample a, discard the concentrate obtained after gravity separation, take the tailings for the second gravity separation, the gravity separation concentrate yield is recorded as c1, the tailings are subjected to the third gravity separation, the gravity separation concentrate yield is recorded as c2, the tailings are subjected to the fourth gravity separation, the gravity separation concentrate yield is recorded as c3, the tailings are subjected to the fifth gravity separation, the gravity separation concentrate yield is recorded as c4, the tailings are subjected to the sixth gravity separation, the gravity separation concentrate yield is recorded as c5, and the gravity separation tailings are recorded as w1; the gravity separation concentrates obtained from the second gravity separation to the sixth gravity separation are recorded as b i , i is 2, 3, 4, 5, 6;

[0037] Step 3, finely grind the gravity separation tailings w1 until the fineness is 200 mesh (-0.074mm) and all passes through to obtain sample w2;

[0038] Step 4: Take 500g of sample w2, prepare the slurry, add copper sulfate, butyl xanthate and MIBC respectively for open circuit flotation. The flotation time and dosage are detailed in the instruction manual. Figure 1 , flotation tailings are recorded as w3, and the flotation tailings yield is recorded as h;

[0039] Step 5: Gravity separation of concentrate b i The gold grade of each sample is measured and recorded as d i ;

[0040] Step 6, sampling the flotation tailings w3 to analyze the gold grade, recorded as d6;

[0041] Step 7: Gravity separation of concentrate b i Take samples to make MLA (automatic mineral analyzer) samples, denoted as h i ;

[0042] Step 8: MLA sample h i Automatic mineralogical analysis was performed to obtain h i The content of pyrite, arsenopyrite and gangue minerals in the medium is recorded as e i 1. e i 2. e i 3;

[0043] Step 9: Gravity separation of concentrate b i The gold grade is converted into data, and the re-selected concentrate b i The gold grade after conversion is recorded as f i , the grade conversion formula is: f i =(d i -d i *e i 3) / (1-e i 3);

[0044] Step 10: convert the data of pyrite and arsenopyrite mineral contents, where the pyrite and arsenopyrite conversion contents are recorded as g i 1. g i 2. The conversion formula for substance content is: g i 1=e i 1 / (e i 1+e i 2) g i 2=e i 2 / (e i 1+e i 2);

[0045] Step 11, taking the conversion content of arsenopyrite or pyrite as the horizontal coordinate, the gravity separation concentrate b i Gold grade after conversion i As the ordinate, fit a linear trend line and remove unreasonable data (the straight line that obviously deviates from the main data point group);

[0046] Step 12: After removing the data, refit the curve based on the new data to obtain the linear formula y=kx+m, where y=f i , x = g i 1 or g i 2;

[0047] Step 13, setting special parameters, you can get the gold content of arsenopyrite or pyrite, in g / t; if x=1, then y=k+mg / t, the gold content of arsenopyrite or pyrite is k+mg / t; if x=0, then y=mg / t, the gold content of arsenopyrite or pyrite is mg / t.

[0048] In the step 1, sample a is reselected to control the yield to be less than or equal to 0.01%. This is mainly because a small yield is required. A yield that is too large is not suitable for some ores.

[0049] Example 2

[0050] A method for determining the gold content of gold-bearing minerals in a binary system gold ore comprises the following steps:

[0051] Step 1, grinding;

[0052] Step 2: Re-select sample a with a yield of 0.01%, discard the re-selected concentrate, continue re-selection, with a yield of c1 of 0.26%, obtain re-selected concentrate b1, continue re-selection, with a yield of c2 of 0.51%, obtain re-selected concentrate b2, continue re-selection, with a yield of c3 of 1.06%, obtain re-selected concentrate b3, continue re-selection, with a yield of c4 of 2.21%, obtain re-selected concentrate b4, continue re-selection, with a yield of c5 of 4.10%, obtain re-selected concentrate b5, and re-selection tailings w1;

[0053] Step 3, continue grinding the gravity separation tailings w1 to obtain sample w2;

[0054] Step 4, 500 g of sample w2 is sampled for open circuit flotation, and the yield h is 10%, to obtain flotation tailings w3;

[0055] From step 5 to step 8, the gold grades d1 to d6 were analyzed and the material composition was measured, as shown in Table 1;

[0056] Step 9 to step 10, transform data, see Table 2 for details;

[0057] Step 11: Eliminate abnormal data b3, see Figure 1 ;

[0058] Step 12: Refit the curve to obtain the linear formula y=66.722x+13.158, see Figure 2 ;

[0059] Step 13: Set special parameters.

[0060] Take x = 1, then y = 66.722x + 13.158 = 66.722 + 13.158 = 79.88 g / t, take x = 0, then

[0061] y=66.722x+13.158=13.158g / t, we can get the gold content of arsenopyrite and pyrite, which are 79.88g / t and 13.158g / t respectively.

[0062] in:

[0063] Step 1: 5 kg of the sample to be tested is taken, which can be adjusted appropriately, mainly based on the properties of the ore itself, that is, the amount of sulfide content, to avoid taking too little sample, which makes it difficult to separate a sufficient amount of gold-bearing minerals;

[0064] Step 2: Sample a is re-selected with a yield of 0.01%, and the re-selected concentrate is discarded, mainly to eliminate the interference of monomeric gold particles. The leaching method used by predecessors has a certain effect on monomeric gold, but the effect is not good for coarse and above gold minerals. If it is not processed cleanly, it will directly affect the accuracy of the data;

[0065] Step 2, the sample a is re-selected, and multiple steps of re-selection are performed to obtain multiple re-selection concentrate products. Compared with the multiple products obtained by manual re-selection and other methods introduced in the previous related patents, this method is a multi-stage continuous re-selection, which can obtain significantly differentiated products, with clearer distinction and more reliable data. It is almost difficult to effectively separate minerals with small density and particle size distinction in manual re-selection;

[0066] Step 2, the multiple re-selected concentrate products are reasonably obtained by physical methods to obtain high-carrier mineral concentrates, avoiding the disadvantages of the leaching method, and completely retaining the gold carried by the carrier minerals, that is, the gold content of the carrier minerals actually refers to the two parts of the encapsulated gold and the continuous gold;

[0067] Step 2: The multi-step gravity separation operation takes much shorter time than the leaching operation.

[0068] Step 3, the gravity separation tailings w1 are further finely ground until the fineness is 200 mesh (-0.074mm) and all the particles pass through. Based on the properties of the ore, further fine grinding can be performed to fully separate the gold-bearing minerals from the gangue.

[0069] Step 4: Take 500g of sample w2 for open-circuit flotation, and the yield is calculated as h. The value of h can be 10%, which is adjusted based on the actual situation. The purpose of this operation is to eliminate the interference of sulfide and obtain relatively pure gangue minerals;

[0070] Step 4: The flotation tailings w3 is the basic standard sample for data calibration, which involves subsequent data conversion to avoid the unreasonable direct application of the data of each concentrate product, because the concentrate cannot avoid containing gangue, and the content of gangue affects the composition and grade of the concentrate minerals. The fitting curve is a linear curve, and theoretically no third material can be involved. At the same time, the grade is not the real grade;

[0071] Step 4: Take 500g of sample w2 for open circuit flotation, add copper sulfate, butyl xanthate and MIBC, and the flotation time and dosage are conventional operations, which can be adjusted based on actual conditions;

[0072] Step 6, the w3 is sampled and tested for gold grade, generally using fire assay enrichment-atomic absorption method to measure gold grade, because the gold grade is generally very low;

[0073] Step eight, the sample h i Automatic mineralogical analysis is more accurate than manual microscopic classification of mineral content, especially for the determination of gangue content, which involves subsequent data conversion. Otherwise, direct application of data will not produce a correct curve, let alone distinguish abnormal values ​​of the data;

[0074] Step nine, the test grade is converted into data, and the grade is recorded as f i , the purpose is to obtain the true grade of gold-bearing minerals in the binary system;

[0075] Step 10, the data of the pyrite and arsenopyrite mineral contents are converted to obtain the true content of gold-bearing minerals in the binary system;

[0076] Step 11, the unreasonable data are removed, which refers to the data that obviously deviates from the fitted linear curve;

[0077] Table 1 Material composition and gold grade analysis of each product

[0078]

[0079] Table 2 Transformation results

[0080]

[0081] 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.

[0082] 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.

[0083] 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 binary system gold ore gold-bearing mineral gold content determination method, characterized in that The following steps are involved: Step 1, grinding the sample to be tested to a fineness of 200 mesh and a content of 70%, recorded as sample a; Step 2: Perform the first gravity selection on sample a, discard the concentrate obtained after gravity selection, take the tailings for the second gravity selection, and record the gravity selection concentrate yield as c1. Perform the third gravity selection on the tailings, and record the gravity selection concentrate yield as c2. Perform the fourth gravity selection on the tailings, and record the gravity selection concentrate yield as c3. Perform the fifth gravity selection on the tailings, and record the gravity selection concentrate yield as c4. Perform the sixth gravity selection on the tailings, and record the gravity selection concentrate yield as c5. The gravity selection tailings are recorded as w1. The gravity selection concentrates obtained from the second gravity selection to the sixth gravity selection are recorded as b. i , i is 2, 3, 4, 5, 6; Step 3, finely grinding the gravity separation tailings w1 until the fineness is 200 mesh and all passes through to obtain sample w2; Step 4, 500 g of sample w2 is sampled, slurry is prepared, copper sulfate, butyl xanthate and MIBC are added respectively for open circuit flotation, the flotation tailings are recorded as w3, and the flotation tailings yield is recorded as h; Step 5: Gravity separation of concentrate b i Take samples for gold testing respectively, record as d i ; Step 6, sampling the flotation tailings w3 to analyze the gold grade, recorded as d6; Step 7: Gravity separation of concentrate b i Take samples to make MLA samples, denoted as h i ; Step 8: MLA sample h i Automatic mineralogical analysis was performed to obtain h i The content of pyrite, arsenopyrite and gangue minerals in the medium is recorded as e i 1. e i 2. e i 3; Step 9: Gravity separation of concentrate b i The gold grade is converted into data, and the re-selected concentrate b i The gold grade after conversion is recorded as f i , the grade conversion formula is: f i =(d i -d i *e i 3) / (1-e i 3); Step 10: convert the data of pyrite and arsenopyrite mineral contents, where the pyrite and arsenopyrite conversion contents are recorded as g i 1. g i 2. The conversion formula is: g i 1=e i 1 / (e i 1+e i 2) g i 2=e i 2 / (e i 1+e i 2); Step 11, taking the conversion content of arsenopyrite or pyrite as the horizontal coordinate, the gravity separation concentrate b i Gold grade after conversion i As the vertical axis, fit the linear trend line and remove unreasonable data; Step 12: After removing the data, refit the curve based on the new data to obtain the linear formula y=kx+m, where y=f i , x = g i 1 or g i 2; Step 13, setting special parameters to obtain the gold content of arsenopyrite or pyrite in g / t; If x=1, then y=k+mg / t, and the gold content of arsenopyrite or pyrite is k+mg / t; if x=0, then y=mg / t, and the gold content of arsenopyrite or pyrite is mg / t.

2. A method for determining the gold content of gold-bearing minerals in a binary system gold ore according to claim 1, characterized in that In the step 1, sample a is reselected and the yield is controlled to be less than or equal to 0.01%.

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