Calculation method of oxidation rate of S, As and Fe in biological oxidation process

Abstract

The application provides a method for calculating oxidation rates of S, As and Fe in a biological oxidation process, and belongs to the technical field of process mineralogy. The method introduces MLA to detect the change of the relative content of minerals before and after the biological oxidation of gold concentrate, and calculates the oxidation rate of the biological oxidation process, thereby avoiding the technical problem that the traditional acid-base chemical leaching method for detecting the iron, sulfur and arsenic phases will produce toxic and harmful gases. The application eliminates the influence of the outer oxidation film of sulfide in the oxidation residue through pretreatment of the oxidation residue, reduces the measurement error of the relative content of the sulfide phase, introduces a correction coefficient for calculation, reduces the calculation error caused by irregular mineral particle morphology and too small particle size, and thus obtains a more actual true quality, so that the measured content of the mineral is more accurate. Compared with the traditional method, the method is simple in operation, simple in process, accurate in data and strong in timeliness.

Description

Technical Field

[0001] This invention relates to the field of process mineralogy, specifically to a method for calculating the oxidation rates of S, As, and Fe in a bio-oxidation process. Background Technology

[0002] In the process of treating refractory gold ore by bio-oxidation, sulfur (S), iron (Fe), and arsenic (As) are key elements associated with gold in the ore. Their oxidation behavior directly reflects the progress and effect of the bio-oxidation reaction. Therefore, the accurate calculation of the oxidation rate of these three elements is of great significance and is the core basis for evaluating process efficiency and optimizing reaction conditions.

[0003] In practical applications, the calculation of oxidation rates of S, Fe, and As faces numerous technical challenges. Early chemical analysis methods (such as titration and colorimetry) are simple to operate, but they suffer from problems such as complex sample processing, numerous interfering factors, and long detection cycles, making it difficult to reflect the real-time oxidation dynamics of elements.

[0004] With the development of detection technology, modern instrumental analysis methods such as atomic absorption spectrometry and ion chromatography have been gradually applied to the determination of elemental content, which has improved the detection accuracy. However, the samples need to be treated with strong acids and alkalis in the early stage. The toxic and harmful gases released in the process can cause harm to the human body and the environment. In addition, in complex mineral slurry systems, the high turbidity, high salinity and interference from other coexisting ions in the slurry may still lead to deviations in the measurement results, which in turn affect the accuracy of the oxidation rate calculation.

[0005] Therefore, developing an accurate, rapid, safe, simple, and economical method for calculating the oxidation rate of biological oxidation processes, accurately determining the content of S, Fe, and As, and improving the accuracy of oxidation rate calculation is of great practical significance and has broad application prospects. Summary of the Invention

[0006] In view of the technical problems existing in the background art, this application provides a method for calculating the oxidation rate of S, As and Fe in a bio-oxidation process. Compared with the traditional method, this method is simple to operate, has a simple process, and provides accurate and timely data.

[0007] This application provides a method for calculating the oxidation rates of S, As, and Fe in a bio-oxidation process, comprising the following steps:

[0008] S1. Preparation of MLA sample of gold concentrate: Mix the gold concentrate evenly and reduce it. Take 5g of gold concentrate to make MLA sample, which is recorded as MLA sample 1 for later use; take the gold concentrate sample, which is recorded as sample 1 for later use, with a weight of G1.

[0009] A 1 kg gold concentrate sample was sieved. Particles smaller than 0.010 mm were designated as Sample 2; particles between 0.010 and 0.037 mm were designated as Sample 3; particles between 0.037 and 0.074 mm were designated as Sample 4; and particles larger than 0.074 mm were designated as Sample 5. 5 g of each of Samples 2, 3, 4, and 5 were taken to prepare MLA samples, which were then designated as MLA Sample 2, MLA Sample 3, MLA Sample 4, and MLA Sample 5, respectively. The remaining weights of Samples 2, 3, 4, and 5 were G2, G3, G4, and G5, respectively, and G2 + G3 + G4 + G5 + 5 × 4 = 1 kg.

[0010] S2. Preparation of MLA samples of oxidation slag: Sample 1 and the remaining samples 2-5 were subjected to bio-oxidation experiments under the same conditions. After the oxidation was completed, bio-oxidation slag was obtained.

[0011] The bio-oxidation residue of sample 1 is denoted as sample 1', and 5g is taken as MLA sample 1'. The remaining weight of sample 1' is denoted as G1'. The bio-oxidation residue of sample 2 is denoted as sample 2', and the remaining weight of sample 2' is denoted as G2'. The bio-oxidation residue of sample 3 is denoted as sample 3', and the remaining weight of sample 3' is denoted as G3'. And so on, the remaining weight of sample 4' is denoted as G4'. The remaining weight of sample 5' is denoted as weight G5'.

[0012] Samples 1', 2', 3', 4', and 5' were pretreated with biological oxidation residue. The weight of sample 1'' after pretreatment was recorded as G1''. Similarly, the weights of samples 2' to 5' after pretreatment were recorded as G2'', G3'', G4'', and G5'', respectively.

[0013] Take sample 1'' of G1'' / G1×5g and prepare MLA sample 1'' for later use; take sample 2'' of G2'' / G2×5g and prepare MLA sample 2'' for later use; take sample 3'' of G3'' / G3×5g and prepare MLA sample 3'' for later use, and so on, prepare MLA sample 4'' and MLA sample 5'' for later use;

[0014] S3. Sample testing: MLA samples 1-5 and MLA samples 1''-5'' were ground and polished, then carbonized, and then placed in an automated mineral analysis system for measurement.

[0015] S4. Calculation of K1 for relative content correction of gold concentrate: The relative content of pyrite mineral composition in MLA sample 1 is X1, and the relative contents of pyrite mineral composition in MLA samples 2-5 are X2, X3, X4, and X5, respectively. K1=[(G2 / 980)×X2+(G3 / 980)×X3+(G4 / 980)×X4+(G5 / 980)×X5] / X1;

[0016] K2 correction for relative content of bio-oxidation slag: The relative content of pyrite mineral composition in MLA sample 1'' is X1'', and the relative content of pyrite mineral composition in MLA samples 2''-5'' is X2'', X3'', X4'', and X5'', respectively;

[0017] K2=(G2''×X2''+G3''×X3''+G4''×X4''+G5''×X5'') / (G2''+G3''+G4''+G5'') / X1'';

[0018] S5. Oxidation rate calculation: The sulfides in MLA sample 1 of gold concentrate were found to be pyrite, arsenopyrite, chalcopyrite, realgar, galena, and sphalerite.

[0019] Among them, the Fe content in pyrite, arsenopyrite and chalcopyrite is M1, M2 and M3 respectively;

[0020] The sulfur content in pyrite, arsenopyrite, chalcopyrite, realgar, galena, and sphalerite is N1, N2, N3, N4, N5, and N6, respectively.

[0021] The As content in arsenopyrite and realgar is P1 and P2, respectively;

[0022] The MLA sample 1' of the bio-oxidation slag was tested and found to contain sulfides including pyrite, arsenopyrite, chalcopyrite, realgar, galena, and sphalerite.

[0023] Among them, the Fe content in pyrite, arsenopyrite and chalcopyrite is A1, A2 and A3 respectively;

[0024] The sulfur content in pyrite, arsenopyrite, chalcopyrite, realgar, galena, and sphalerite is B1, B2, B3, B4, B5, and B6, respectively.

[0025] The As content in arsenopyrite and realgar is C1 and C2, respectively;

[0026] The yield of the bio-oxidation residue is F = (G1' + 5) / G1; therefore...

[0027] Fe oxidation rate = 1 - K2 × (X1' × A1 + Y1' × A2 + Z1' × A3) × F / [K1 × (X1 × M1 + Y1 × M2 + Z1 × M3)]

[0028] S oxidation rate = 1 - K2 × (X1' × B1 + Y1' × B2 + Z1' × B3 + O1' × B4 + P1' × B5 + Q1' × B6) × F / [K1 × (X1 × N1 + Y1 × N2 + Z1 × N3 + O1 × N4 + P1 × N5 + Q1 × N6)]

[0029] As oxidation rate = 1 - K2 × (Y1' × C1 + O1' × C2) × F / [K1 × (Y1 × P1 + O1 × P2)].

[0030] Furthermore, in step S2, the pretreatment of the biological oxidation residue includes the following steps: immersing the biological oxidation residue in oxalic acid with a volume fraction of 1%-3% according to a liquid-to-solid ratio of (6-10):1, with a pretreatment temperature of 30-45℃ and a pretreatment time of 1-2h.

[0031] Furthermore, in step S5, the Fe, S, and As contents in pyrite, arsenopyrite, chalcopyrite, realgar, galena, and sphalerite are obtained by averaging the values ​​obtained from multiple spot analyses of the minerals in the sample using scanning electron microscopy.

[0032] Furthermore, in step S4, MLA samples 1-5 were analyzed by the MLA automated mineralogical analysis system, and the relative contents of pyrite mineral composition were obtained as X1, X2, X3, X4, and X5, respectively.

[0033] Furthermore, in step S4, MLA samples 1''-5'' were analyzed by the MLA automated mineralogical analysis system, and the relative contents of pyrite mineral composition were found to be X1'', X2'', X3'', X4'', and X5'', respectively.

[0034] Furthermore, in step S3, the grinding and polishing conditions are as follows: single-point pressure 8-15 Newtons, rotation speed 150-300 r / min, time 8-20 minutes, grinding with 240 grit, 800 grit and 1200 grit sandpaper respectively, and then polishing with 1 micrometer, 3 micrometer and 6 micrometer polishing cloths.

[0035] The beneficial effects of this invention are:

[0036] This application introduces MLA (Medium-Layer Aluminum) detection to measure the changes in the relative mineral content before and after the bio-oxidation of gold concentrate, and calculates the oxidation rate of the bio-oxidation process. This avoids the harm to human health and the environment caused by the toxic and harmful gases produced by traditional acid-base chemical leaching methods for detecting iron, sulfur, and arsenic phases. This application pre-treats the bio-oxidation slag to eliminate the influence of the outer oxide film of sulfides in the slag, reducing the measurement error of the relative sulfide content. This application introduces correction coefficients to reduce the measurement error caused by irregular mineral particle morphology and excessively small particle size, thus obtaining a more accurate measurement of the true mass and the mineral content. Compared with traditional methods, the method of this application is simple to operate, has a convenient process, and provides accurate and timely data.

[0037] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0038] Figure 1 This is a backscattering image of the bio-oxidation residue of sample 1 in Example 1 before pretreatment. Detailed Implementation

[0039] The embodiments of the technical solution of this application are described in detail below. The following embodiments are only used to illustrate the technical solution of this application more clearly, and are therefore only examples, and should not be used to limit the scope of protection of this application.

[0040] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary and secondary relationship of the indicated technical features.

[0041] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0042] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0043] This application provides a method for calculating the oxidation rates of S, As, and Fe in a bio-oxidation process, comprising the following steps:

[0044] S1. Preparation of MLA sample of gold concentrate: Mix the gold concentrate evenly and reduce it. Take 5g of gold concentrate to make MLA sample, which is recorded as MLA sample 1 for later use; take the gold concentrate sample, which is recorded as sample 1 for later use, with a weight of G1.

[0045] A 1 kg gold concentrate sample was sieved. Particles smaller than 0.010 mm were designated as Sample 2; particles between 0.010 and 0.037 mm were designated as Sample 3; particles between 0.037 and 0.074 mm were designated as Sample 4; and particles larger than 0.074 mm were designated as Sample 5. 5 g of each of Samples 2, 3, 4, and 5 were taken to prepare MLA samples, which were then designated as MLA Sample 2, MLA Sample 3, MLA Sample 4, and MLA Sample 5, respectively. The remaining weights of Samples 2, 3, 4, and 5 were G2, G3, G4, and G5, respectively, and G2 + G3 + G4 + G5 + 5 × 4 = 1 kg.

[0046] S2. Preparation of MLA samples of oxidation slag: Sample 1, the remaining sample 2, the remaining sample 3, the remaining sample 4, and the remaining sample 5 were subjected to biological oxidation experiments under the same conditions. After the oxidation was completed, biological oxidation slag was obtained.

[0047] The bio-oxidation residue of sample 1 is denoted as sample 1', and 5g is taken as MLA sample 1'. The remaining weight of sample 1' is denoted as G1'. The bio-oxidation residue of sample 2 is denoted as sample 2', and the remaining weight of sample 2' is denoted as G2'. The bio-oxidation residue of sample 3 is denoted as sample 3', and the remaining weight of sample 3' is denoted as G3'. And so on, the remaining weight of sample 4' is denoted as G4'. The remaining weight of sample 5' is denoted as weight G5'.

[0048] Samples 1', 2', 3', 4', and 5' were pretreated with biological oxidation residue. The weight of sample 1'' after pretreatment was recorded as G1''. Similarly, the weights of samples 2' to 5' after pretreatment were recorded as G2'', G3'', G4'', and G5'', respectively.

[0049] Take sample 1'' of G1'' / G1×5g and prepare MLA sample 1'' for later use; take sample 2'' of G2'' / G2×5g and prepare MLA sample 2'' for later use; take sample 3'' of G3'' / G3×5g and prepare MLA sample 3'' for later use, and so on, prepare MLA sample 4'' and MLA sample 5'' for later use;

[0050] The pretreatment of biological oxidation residue includes the following steps: immersing the biological oxidation residue in oxalic acid with a volume fraction of 1%-3% at a liquid-to-solid ratio of (6-10):1, with a pretreatment temperature of 30-45℃ and a pretreatment time of 1-2 hours.

[0051] S3. Sample testing: MLA samples 1-5 and MLA samples 1''-5'' were ground and polished, then carbonized, and then placed in an automated mineral analysis system for measurement.

[0052] The grinding and polishing conditions are as follows: single-point pressure 8-15 Newtons, rotation speed 150-300 r / min, time 8-20 minutes, grinding with 240 grit, 800 grit and 1200 grit sandpaper respectively, and then polishing with 1 micron, 3 micron and 6 micron polishing cloth.

[0053] S4. Calculation of K1 for relative content correction of gold concentrate: The relative content of pyrite mineral composition in MLA sample 1 is X1, and the relative contents of pyrite mineral composition in MLA samples 2-5 are X2, X3, X4, and X5, respectively. K1=[(G2 / 980)×X2+(G3 / 980)×X3+(G4 / 980)×X4+(G5 / 980)×X5] / X1;

[0054] Among them, X1, X2, X3, X4, and X5 are MLA samples 1-5 obtained by MLA automated mineralogical analysis system.

[0055] The relative content of bio-oxidation slag was corrected for K2 calculation: the relative content of pyrite mineral composition in MLA sample 1'' is X1'', and the relative content of pyrite mineral composition in MLA samples 2''-5'' is X2'', X3'', X4'', and X5'', respectively.

[0056] Among them, X1'', X2'', X3'', X4'', and X5'' are MLA samples 1''-5'' obtained by MLA automated mineralogical analysis system.

[0057] K2=(G2''×X2''+G3''×X3''+G4''×X4''+G5''×X5'') / (G2''+G3''+G4''+G5'') / X1'';

[0058] S5. Oxidation rate calculation: The sulfides in MLA sample 1 of gold concentrate were found to be pyrite, arsenopyrite, chalcopyrite, realgar, galena, and sphalerite.

[0059] Among them, the Fe content in pyrite, arsenopyrite and chalcopyrite is M1, M2 and M3 respectively;

[0060] The sulfur content in pyrite, arsenopyrite, chalcopyrite, realgar, galena, and sphalerite is N1, N2, N3, N4, N5, and N6, respectively.

[0061] The As content in arsenopyrite and realgar is P1 and P2, respectively;

[0062] The MLA sample 1' of the bio-oxidation slag was tested and found to contain sulfides including pyrite, arsenopyrite, chalcopyrite, realgar, galena, and sphalerite.

[0063] Among them, the Fe content in pyrite, arsenopyrite and chalcopyrite is A1, A2 and A3 respectively;

[0064] The sulfur content in pyrite, arsenopyrite, chalcopyrite, realgar, galena, and sphalerite is B1, B2, B3, B4, B5, and B6, respectively.

[0065] The As content in arsenopyrite and realgar is C1 and C2, respectively;

[0066] The yield of the bio-oxidation residue is F = (G1' + 5) / G1; therefore...

[0067] Fe oxidation rate = 1 - K2 × (X1' × A1 + Y1' × A2 + Z1' × A3) × F / [K1 × (X1 × M1 + Y1 × M2 + Z1 × M3)]

[0068] S oxidation rate = 1 - K2 × (X1' × B1 + Y1' × B2 + Z1' × B3 + O1' × B4 + P1' × B5 + Q1' × B6) × F / [K1 × (X1 × N1 + Y1 × N2 + Z1 × N3 + O1 × N4 + P1 × N5 + Q1 × N6)]

[0069] As oxidation rate = 1 - K2 × (Y1' × C1 + O1' × C2) × F / [K1 × (Y1 × P1 + O1 × P2)].

[0070] The Fe, S, and As contents in pyrite, arsenopyrite, chalcopyrite, realgar, galena, and sphalerite were obtained by averaging the values ​​obtained from multiple spot analyses of the minerals in the samples using scanning electron microscopy.

[0071] The following are some specific embodiments. It should be noted that the embodiments described below are exemplary and are only used to explain this application, and should not be construed as limiting this application. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in this field or according to the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be obtained commercially.

[0072] The samples to be tested were sent to a testing institution for analysis of the main chemical components. The test results are shown in Table 1 below:

[0073] Table 1

[0074]

[0075] Calculations show that,

[0076] Fe oxidation rate = 1 - 1.04 / 21.08 = 95.07%.

[0077] S oxidation rate = 1 - 1.18 / 18.40 = 93.59%.

[0078] As oxidation rate = 1 - 0.67 / 20.30 = 96.70%.

[0079] Example 1

[0080] This embodiment provides a method for calculating the oxidation rates of S, As, and Fe in a bio-oxidation process. The method for calculating the oxidation rates of S, As, and Fe in the aforementioned sample during the bio-oxidation process includes the following steps:

[0081] S1. Preparation of MLA samples of gold concentrate:

[0082] First, the gold concentrate is mixed and reduced in volume. 5g of the gold concentrate is taken as an MLA sample, designated as MLA sample 1, for later use. The volume ratio of resin to curing agent is 2:1.

[0083] Take a gold concentrate sample, label it Sample 1, and keep it for later use. Its weight is G1=100g.

[0084] Take a standard sieve and sieve the 1 kg gold concentrate sample. The particles with a diameter of less than 0.010 mm are recorded as sample 2; the particles with a diameter of 0.010-0.037 mm are recorded as sample 3; the particles with a diameter of 0.037-0.074 mm are recorded as sample 4; and the particles with a diameter of more than 0.074 mm are recorded as sample 5.

[0085] Take 5g of each particle size to make MLA samples, and label them as MLA sample 2, MLA sample 3, MLA sample 4, MLA sample 5. The remaining weights of sample 2, sample 3, sample 4, and sample 5 are G2=165g, G3=298g, G4=413g, and G5=104g, respectively, and G2+G3+G4+G5+5×4=1kg.

[0086] S2. Preparation of MLA samples of oxidation residue: Samples 1, 2, 3, 4 and 5 were subjected to biological oxidation experiments under the same conditions. After the oxidation was completed, biological oxidation residue was obtained.

[0087] The backscattering image of the bio-oxidation slag of Sample 1 before pretreatment is shown below. Figure 1 As shown in the diagram. Points 1 and 2 represent pyrite, while point 3 represents an oxide film. It is evident that after the bio-oxidation of gold concentrate, an oxide film forms around the outer edge of the slag, affecting the detection of the relative mineral content.

[0088] The above bio-oxidation residue samples were mixed thoroughly. The bio-oxidation residue of sample 1 was designated as sample 1'. 5g of sample 1' was used as MLA sample 1', and the remaining weight of sample 1' was designated as G1' = 54g. Similarly, 5g of sample 1' was used as MLA sample 2'. The bio-oxidation residue of sample 2 was designated as sample 2', and the remaining weight was designated as G2' = 66.42g. And so on. The bio-oxidation residue of sample 3 was designated as sample 3', and the remaining weight was designated as G3' = 134.97g. The remaining weight of sample 4' was G4' = 185.85g. The remaining weight of sample 5' was G5' = 49.92g.

[0089] Samples 1', 2', 3', 4', and 5' were subjected to pretreatment of biological oxidation residue under the following conditions: the biological oxidation residue was immersed in 2% oxalic acid at a liquid-to-solid ratio of 8:1, the pretreatment temperature was 40℃, the pretreatment time was 1.5 hours, and the stirring speed during pretreatment was 250 r / min.

[0090] The weight of sample 1' after pretreatment is recorded as G1'' = 34.15g. Similarly, the weights of samples 2' to 5' after pretreatment are recorded as G2'', G3'', G4'', and G5'', respectively, which are G2'' = 53.28g, G3'' = 109.98g, G4'' = 149.67g, and G5'' = 40.54g.

[0091] Take 1.71g of sample 1'' (calculated from G1'' / G1×5g) to prepare MLA sample 1'' for later use; take 1.61g of sample 2'' (calculated from G2'' / G2×5g) to prepare MLA sample 2'' for later use; take 1.85g of sample 3'' (calculated from G3'' / G3×5g) to prepare MLA sample 3'' for later use; and so on, take 1.81g of sample 4'' (calculated from G4'' / G4×5g) ​​to prepare MLA sample 4'' for later use; take 1.95g of sample 5'' (calculated from G5'' / G5×5g) to prepare MLA sample 5'' for later use.

[0092] S3. Sample Testing: MLA samples 1-5 and MLA samples 1''-5'' were placed in a polishing machine for polishing under the following conditions: single-point pressure 10 Newtons, rotation speed 200 r / min, and time 10 minutes. They were polished with 240-grit, 800-grit, and 1200-grit sandpaper, respectively, and then polished with 1-micron, 3-micron, and 6-micron polishing cloths. After carbon spraying, they were then measured in an automated mineral analysis system.

[0093] S4. Calculation of relative content correction K1 for gold concentrate: The relative content of pyrite in MLA sample 1 is X1=17.31%, and the relative contents of pyrite in MLA samples 2-5 are X2=17.84%, X3=17.76%, X4=17.74%, and X5=17.65%, respectively.

[0094] K1=[(G2 / 980)×X2+(G3 / 980)×X3+(G4 / 980)×X4+(G5 / 980)×X5] / X1=1.03.

[0095] Calculation of relative content correction K2 in bio-oxidation slag: The relative content of pyrite mineral composition in MLA sample 1'' is X1''=2.52%, and the relative content of pyrite mineral composition in MLA samples 2''-5'' is X2''=2.96%, X3''=2.87%, X4''=2.75%, X5''=2.63%.

[0096] K2=(G2''×X2''+G3''×X3''+G4''×X4''+G5''×X5'') / (G2''+G3''+G4''+G5'') / X1''=1.11.

[0097] S5. Oxidation Rate Calculation:

[0098] Analysis revealed that the sulfides in MLA samples 1 and 1'' included pyrite, arsenopyrite, chalcopyrite, realgar, galena, and sphalerite. The Fe, S, and As contents were calculated as averages from multiple spot analyses using scanning electron microscopy, as detailed in Tables 2 to 4 below.

[0099] Table 2

[0100]

[0101] Table 3

[0102]

[0103] Table 4

[0104]

[0105] The relative mineral content was obtained by an automated mineralogy analysis system.

[0106] The yield of oxidation slag is F = (G1' + 5) / G1 = 0.59;

[0107] Fe oxidation rate = 1 - K2 × (X1' × A1 + Y1' × A2 + Z1' × A3) × F / [K1 × (X1 × M1 + Y1 × M2 + Z1 × M3)]

[0108] =1 - 1.11 × (2.52 × 44.95 + 1.43 × 33.02 + 0.02 × 31.05) × 0.59 / [1.03 × (17.31 × 45.58 + 37.16 × 33.84 + 0.05 × 31.07)] = 95%

[0109] S oxidation rate = 1 - K2 × (X1' × B1 + Y1' × B2 + Z1' × B3 + O1' × B4 + P1' × B5 + Q1' × B6) × F / [K1 × (X1 × N1 + Y1 × N2 + Z1 × N3 + O1 × N4 + P1 × N5 + Q1 × N6)]

[0110] =1 - 1.11 × (2.52 × 54.07 + 1.43 × 19.14 + 0.02 × 35.21 + 0.56 × 30.17 + 0.02 × 12.78 + 0.02 × 33.62) × 0.59 / [1.03 × (17.31 × 54.42 + 37.16 × 19.66 + 0.05 × 35.24 + 3.58 × 30.82 + 0.02 × 12.78 + 0.02 × 33.62)] = 93.53%

[0111] As oxidation rate = 1 - K2 × (Y1' × C1 + O1' × C2) × F / [K1 × (Y1 × P1 + O1 × P2)]

[0112] =1-1.11×(1.43×45.78+0.56×68.72)×0.59 / [1.03×(37.1×46.5+3.58×69.18)]=96.65%.

[0113] Therefore, the test results obtained by this method are reliable. Furthermore, this method does not require strong acid or alkali treatment of the samples, making it environmentally friendly and easy to operate.

[0114] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. A method for calculating the oxidation rates of S, As, and Fe in a bio-oxidation process, characterized in that, Includes the following steps: S1. Preparation of MLA sample of gold concentrate: Mix the gold concentrate evenly and reduce it. Take 5g of gold concentrate to make MLA sample, which is recorded as MLA sample 1 for later use; take the gold concentrate sample, which is recorded as sample 1 for later use, with a weight of G1. A 1 kg gold concentrate sample was sieved. Particles smaller than 0.010 mm were designated as Sample 2; particles between 0.010 and 0.037 mm were designated as Sample 3; particles between 0.037 and 0.074 mm were designated as Sample 4; and particles larger than 0.074 mm were designated as Sample 5. 5 g of each of Samples 2, 3, 4, and 5 were taken to prepare MLA samples, which were then designated as MLA Sample 2, MLA Sample 3, MLA Sample 4, and MLA Sample 5, respectively. The remaining weights of Samples 2, 3, 4, and 5 were G2, G3, G4, and G5, respectively, and G2 + G3 + G4 + G5 + 5 × 4 = 1 kg. S2. Preparation of MLA samples of oxidation slag: Sample 1 and the remaining samples 2-5 were subjected to bio-oxidation experiments under the same conditions. After the oxidation was completed, bio-oxidation slag was obtained. The bio-oxidation residue of sample 1 is denoted as sample 1', and 5g is taken as MLA sample 1'. The remaining weight of sample 1' is denoted as G1'. The bio-oxidation residue of sample 2 is denoted as sample 2', and the remaining weight of sample 2' is denoted as G2'. The bio-oxidation residue of sample 3 is denoted as sample 3', and the remaining weight of sample 3' is denoted as G3'. And so on, the remaining weight of sample 4' is denoted as G4'. The remaining weight of sample 5' is denoted as weight G5'. Samples 1', 2', 3', 4', and 5' were pretreated with biological oxidation residue. The weight of sample 1'' after pretreatment was recorded as G1''. Similarly, the weights of samples 2' to 5' after pretreatment were recorded as G2'', G3'', G4'', and G5'', respectively. Take sample 1'' of G1'' / G1×5g and prepare MLA sample 1'' for later use; take sample 2'' of G2'' / G2×5g and prepare MLA sample 2'' for later use; take sample 3'' of G3'' / G3×5g and prepare MLA sample 3'' for later use, and so on, prepare MLA sample 4'' and MLA sample 5'' for later use; S3. Sample testing: MLA samples 1-5 and MLA samples 1''-5'' were ground and polished, then carbonized, and then placed in an automated mineral analysis system for measurement. S4. Calculation of K1 for relative content correction of gold concentrate: The relative content of pyrite mineral composition in MLA sample 1 is X1, and the relative contents of pyrite mineral composition in MLA samples 2-5 are X2, X3, X4, and X5, respectively. K1=[(G2 / 980)×X2+(G3 / 980)×X3+(G4 / 980)×X4+(G5 / 980)×X5] / X1; K2 correction for relative content of bio-oxidation slag: The relative content of pyrite mineral composition in MLA sample 1'' is X1'', and the relative content of pyrite mineral composition in MLA samples 2''-5'' is X2'', X3'', X4'', and X5'', respectively; K2=(G2''×X2''+G3''×X3''+G4''×X4''+G5''×X5'') / (G2''+G3''+G4''+G5'') / X1''; S5. Oxidation rate calculation: The sulfides in MLA sample 1 of gold concentrate were found to be pyrite, arsenopyrite, chalcopyrite, realgar, galena, and sphalerite. Among them, the Fe content in pyrite, arsenopyrite and chalcopyrite is M1, M2 and M3 respectively; The sulfur content in pyrite, arsenopyrite, chalcopyrite, realgar, galena, and sphalerite is N1, N2, N3, N4, N5, and N6, respectively. The As content in arsenopyrite and realgar is P1 and P2, respectively; The MLA sample 1' of the bio-oxidation slag was tested and found to contain sulfides including pyrite, arsenopyrite, chalcopyrite, realgar, galena, and sphalerite. Among them, the Fe content in pyrite, arsenopyrite and chalcopyrite is A1, A2 and A3 respectively; The sulfur content in pyrite, arsenopyrite, chalcopyrite, realgar, galena, and sphalerite is B1, B2, B3, B4, B5, and B6, respectively. The As content in arsenopyrite and realgar is C1 and C2, respectively; The yield of the bio-oxidation residue is F = (G1' + 5) / G1; therefore... Fe oxidation rate = 1 - K2 × (X1' × A1 + Y1' × A2 + Z1' × A3) × F / [K1 × (X1 × M1 + Y1 × M2 + Z1 × M3)] S oxidation rate = 1 - K2 × (X1' × B1 + Y1' × B2 + Z1' × B3 + O1' × B4 + P1' × B5 + Q1' × B6) × F / [K1 × (X1 × N1 + Y1 × N2 + Z1 × N3 + O1 × N4 + P1 × N5 + Q1 × N6)] As oxidation rate = 1 - K2 × (Y1' × C1 + O1' × C2) × F / [K1 × (Y1 × P1 + O1 × P2)].

2. The method for calculating the oxidation rates of S, As, and Fe in the bio-oxidation process according to claim 1, characterized in that, In step S2, the pretreatment of the biological oxidation residue includes the following steps: according to the liquid-solid ratio of (6-10):1, the biological oxidation residue is immersed in oxalic acid with a volume fraction of 1%-3%, the pretreatment temperature is 30-45℃, and the pretreatment time is 1-2h.

3. The method for calculating the oxidation rates of S, As, and Fe in the bio-oxidation process according to claim 1, characterized in that, In step S5, the contents of Fe, S, and As in pyrite, arsenopyrite, chalcopyrite, realgar, galena, and sphalerite are obtained by averaging the values ​​obtained from multiple spot analyses of the minerals in the samples using scanning electron microscopy.

4. The method for calculating the oxidation rates of S, As, and Fe in the bio-oxidation process according to claim 1, characterized in that, In step S3, the grinding and polishing conditions are: single-point pressure of 8-15 Newtons, rotation speed of 150-300 r / min, time of 8-20 minutes, grinding with 240 grit, 800 grit and 1200 grit sandpaper respectively, and then polishing with 1 micrometer, 3 micrometer and 6 micrometer polishing cloths.

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