Method for calculating oxidation rates of S, As and Fe in biological oxidation process

Abstract

The invention provides a method for calculating the oxidation rates of S, As and Fe in a biological oxidation process, and belongs to the technical field of process mineralogy. According to the method, MLA is introduced to detect the change of the relative content of minerals before and after biological oxidation of the gold concentrate, the oxidation rate of the biological oxidation process is measured, and the technical problem that toxic and harmful gas can be generated when iron, sulfur and arsenic phases are detected through a traditional acid-base chemical leaching method is solved; by pretreating the oxidizing slag, the influence of an oxidation film on the outer ring of sulfide in the oxidizing slag is eliminated, and the measurement error of the relative content of the sulfide is reduced; according to the method, the correction coefficient is introduced for measurement and calculation, and measurement and calculation errors caused by irregular shapes and too small particle sizes of mineral particles are reduced, so that the real mass closer to the reality is obtained, and the measured mineral content is more accurate. Compared with a traditional method, the method is easy to operate, simple and convenient in process, accurate in data and high in timeliness.

Description

Technical Field

[0001] The present invention relates to the technical field of process mineralogy, and in particular to a method for calculating the oxidation rates of S, As and Fe in a biological oxidation process. Background Art

[0002] During the bio-oxidation process for treating refractory gold ores, sulfur (S), iron (Fe), and arsenic (As), as key elements associated with gold in the ore, their oxidation behavior directly reflects the progress and effect of the bio-oxidation reaction. Therefore, accurate calculation of the oxidation rates 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, calculating the oxidation rates of S, Fe, and As presents numerous technical challenges. Early chemical analysis methods (such as titration and colorimetry), while simple to perform, suffer from complex sample preparation, numerous interfering factors, and long detection cycles, making it difficult to accurately reflect the oxidation dynamics of these elements.

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

[0005] Therefore, developing an accurate, fast, safe, simple, economical and practical method for calculating the oxidation rate of the bio-oxidation process, accurately determining the S, Fe and As contents and improving the accuracy of the oxidation rate calculation has important practical significance and broad application prospects. Summary of the Invention

[0006] In view of the technical problems existing in the background technology, the present application provides a method for calculating the oxidation rates of S, As and Fe in a biological oxidation process. Compared with traditional methods, this method is simple to operate, has a simple process, and has accurate data and strong timeliness.

[0007] The present application provides a method for calculating the oxidation rates of S, As, and Fe in a biological oxidation process, comprising the following steps: S1. Preparation of gold concentrate MLA sample: Mix and divide the gold concentrate, take 5g of gold concentrate as MLA sample, recorded as MLA sample 1; take a gold concentrate sample, recorded as sample 1, and weigh G1; 1 kg of gold concentrate sample was sieved, and the particle size was less than 0.010 mm, recorded as sample 2; the particle size was 0.010-0.037 mm, recorded as sample 3; the particle size was 0.037-0.074 mm, recorded as sample 4; the particle size was greater than 0.074 mm, recorded as sample 5; 5 g of sample 2, sample 3, sample 4, and sample 5 were taken respectively to make MLA samples, which were recorded as MLA sample 2, MLA sample 3, MLA sample 4, and MLA sample 5 respectively; the remaining weights of sample 2, sample 3, sample 4, and sample 5 were G2, G3, G4, and G5, respectively, and G2+G3+G4+G5+5×4=1 kg; S2. Preparation of oxidation slag MLA samples: Sample 1 and the remaining samples 2-5 were subjected to biological oxidation experiments under the same conditions. After the oxidation was completed, biological oxidation slag was obtained; The biological oxidation residue of sample 1 is recorded as sample 1', 5 g is taken to make MLA sample 1', and the remaining weight of sample 1' is recorded as G1'; the biological oxidation residue of sample 2 is recorded as sample 2', and the remaining weight of sample 2' is recorded as G2'; the biological oxidation residue of sample 3 is recorded as sample 3', and the remaining weight of sample 3' is recorded as G3'; and so on, the remaining weight of sample 4' is recorded as G4'; the remaining weight of sample 5' is recorded as weight G5'; Samples 1', 2', 3', 4' and 5' were pretreated with biological oxidation slag respectively. The weight of sample 1'' corresponding to 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 to prepare MLA sample 1'' for later use; take sample 2'' of G2'' / G2×5g to prepare MLA sample 2'' for later use; take sample 3'' of G3'' / G3×5g to prepare MLA sample 3'' for later use, and so on, prepare MLA sample 4'' for later use and MLA sample 5'' for later use; S3. Sample testing: MLA samples 1-5 and MLA samples 1''-5'' were subjected to grinding and polishing operations and then carbonized and placed in an automatic mineral analysis system for measurement; S4. Calculation of K1 correction for relative content 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; The relative content of biological oxidation slag was corrected by 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''; 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 tested include pyrite, arsenopyrite, chalcopyrite, realgar, galena, and sphalerite; Among them, the Fe contents in pyrite, arsenopyrite, and chalcopyrite are M1, M2, and M3 respectively; The S contents in pyrite, arsenopyrite, chalcopyrite, realgar, galena, and sphalerite are N1, N2, N3, N4, N5, and N6 respectively; The As content in arsenopyrite and realgar is P1 and P2 respectively; The sulfides in MLA sample 1' of the bio-oxidation slag were pyrite, arsenopyrite, chalcopyrite, realgar, galena, and sphalerite; Among them, the Fe contents in pyrite, arsenopyrite, and chalcopyrite are A1, A2, and A3 respectively; The S contents in pyrite, arsenopyrite, chalcopyrite, realgar, galena and sphalerite are B1, B2, B3, B4, B5 and B6 respectively; The As content in arsenopyrite and realgar is C1 and C2 respectively; The yield of biological oxidation slag F=(G1'+5) / G1; then 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)].

[0008] Furthermore, in step S2, the pretreatment of the biological oxidation slag includes the following steps: immersing the biological oxidation slag in oxalic acid with a volume fraction of 1%-3% according to a liquid-solid ratio of (6-10):1, the pretreatment temperature is 30-45°C, and the pretreatment time is 1-2h.

[0009] Furthermore, in step S5, the contents of Fe, S and As in pyrite, arsenopyrite, chalcopyrite, realgar, galena and sphalerite are obtained by averaging multiple point analyses of the minerals in the sample using a scanning electron microscope.

[0010] Furthermore, in step S4, MLA samples 1-5 are tested by the MLA automatic mineralogical analysis system, and the relative contents of pyrite mineral compositions are obtained as X1, X2, X3, X4, and X5, respectively.

[0011] Furthermore, in step S4, MLA samples 1''-5'' were tested by the MLA automatic mineralogical analysis system, and the relative contents of pyrite mineral compositions were obtained as X1'', X2'', X3'', X4'', and X5'', respectively.

[0012] Furthermore, in step S3, the grinding and polishing conditions are: single point pressure 8-15 Newtons, rotation speed 150-300 r / min, time 8-20 minutes, polishing with 240 mesh, 800 mesh, and 1200 mesh sandpaper respectively, and then polishing with 1 micron, 3 micron, and 6 micron polishing cloth.

[0013] The beneficial effects of the present invention are: This application introduces MLA to detect the change in the relative content of minerals before and after the biological oxidation of gold concentrate, measures the oxidation rate of the biological oxidation process, and avoids the harm to the human body and the environment caused by toxic and harmful gases produced by the traditional acid-base chemical leaching method for detecting iron, sulfur, and arsenic phases; this application pre-treats the biological oxidation slag to eliminate the influence of the outer oxide film of sulfide in the oxidation slag, thereby reducing the measurement error of the relative content of sulfide; this application introduces a correction coefficient for measurement to reduce the measurement error caused by the irregular shape of mineral particles and the small particle size, thereby obtaining a true mass closer to the actual mass and making the measured mineral content more accurate. Compared with traditional methods, the method of this application is simple to operate, has a simple process, and has accurate data and strong timeliness.

[0014] 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

[0015] Figure 1 This is the backscattering image of sample 1 before biological oxidation slag pretreatment in Example 1. DETAILED DESCRIPTION

[0016] The following embodiments of the technical solution of the present application are described in detail. 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 are not intended to limit the scope of protection of the present application.

[0017] In the description of the embodiments of the present application, technical terms such as "first" and "second" 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.

[0018] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0019] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0020] The present application provides a method for calculating the oxidation rates of S, As, and Fe in a biological oxidation process, comprising the following steps: S1. Preparation of gold concentrate MLA sample: Mix and divide the gold concentrate, take 5g of gold concentrate as MLA sample, recorded as MLA sample 1; take a gold concentrate sample, recorded as sample 1, and weigh G1; 1 kg of gold concentrate sample was sieved, and the particle size was less than 0.010 mm, recorded as sample 2; the particle size was 0.010-0.037 mm, recorded as sample 3; the particle size was 0.037-0.074 mm, recorded as sample 4; the particle size was greater than 0.074 mm, recorded as sample 5; 5 g of sample 2, sample 3, sample 4, and sample 5 were taken respectively to make MLA samples, which were recorded as MLA sample 2, MLA sample 3, MLA sample 4, and MLA sample 5 respectively; the remaining weights of sample 2, sample 3, sample 4, and sample 5 were G2, G3, G4, and G5, respectively, and G2+G3+G4+G5+5×4=1 kg; S2. Preparation of oxidation slag MLA samples: 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; The biological oxidation residue of sample 1 is recorded as sample 1', 5 g is taken to make MLA sample 1', and the remaining weight of sample 1' is recorded as G1'; the biological oxidation residue of sample 2 is recorded as sample 2', and the remaining weight of sample 2' is recorded as G2'; the biological oxidation residue of sample 3 is recorded as sample 3', and the remaining weight of sample 3' is recorded as G3'; and so on, the remaining weight of sample 4' is recorded as G4'; the remaining weight of sample 5' is recorded as weight G5'; Samples 1', 2', 3', 4' and 5' were pretreated with biological oxidation slag respectively. The weight of sample 1'' corresponding to 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 to prepare MLA sample 1'' for later use; take sample 2'' of G2'' / G2×5g to prepare MLA sample 2'' for later use; take sample 3'' of G3'' / G3×5g to prepare MLA sample 3'' for later use, and so on, prepare MLA sample 4'' for later use and MLA sample 5'' for later use; The bio-oxidation slag pretreatment includes the following steps: immersing the bio-oxidation slag in oxalic acid with a volume fraction of 1%-3% according to a liquid-solid ratio of (6-10):1, the pretreatment temperature is 30-45°C, and the pretreatment time is 1-2h.

[0021] S3. Sample testing: MLA samples 1-5 and MLA samples 1''-5'' were subjected to grinding and polishing operations and then carbonized and placed in an automatic mineral analysis system for measurement; The grinding and polishing conditions are: single point pressure 8-15 Newtons, rotation speed 150-300r / min, time 8-20 minutes, polished with 240 mesh, 800 mesh, and 1200 mesh sandpaper respectively, and then polished with 1 micron, 3 micron, and 6 micron polishing cloth.

[0022] S4. Calculation of K1 correction for relative content 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; Among them, X1, X2, X3, X4, and X5 are obtained by testing MLA samples 1-5 using the MLA automatic mineralogical analysis system.

[0023] Calculation of relative content correction of biological oxidation slag by K2: 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''.

[0024] Among them, X1'', X2'', X3'', X4'', and X5'' are obtained by testing MLA samples 1''-5'' using the MLA automatic mineralogical analysis system.

[0025] 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 tested include pyrite, arsenopyrite, chalcopyrite, realgar, galena, and sphalerite; Among them, the Fe contents in pyrite, arsenopyrite, and chalcopyrite are M1, M2, and M3 respectively; The S contents in pyrite, arsenopyrite, chalcopyrite, realgar, galena, and sphalerite are N1, N2, N3, N4, N5, and N6 respectively; The As content in arsenopyrite and realgar is P1 and P2 respectively; The sulfides in MLA sample 1' of the bio-oxidation slag were pyrite, arsenopyrite, chalcopyrite, realgar, galena, and sphalerite; Among them, the Fe contents in pyrite, arsenopyrite, and chalcopyrite are A1, A2, and A3 respectively; The S contents in pyrite, arsenopyrite, chalcopyrite, realgar, galena and sphalerite are B1, B2, B3, B4, B5 and B6 respectively; The As content in arsenopyrite and realgar is C1 and C2 respectively; The yield of biological oxidation slag F=(G1'+5) / G1; then 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)].

[0026] Among them, the content of Fe, S and As in pyrite, arsenopyrite, chalcopyrite, realgar, galena and sphalerite is obtained by averaging the minerals in the sample through multiple point analyses using a scanning electron microscope.

[0027] Some specific examples are listed below. It should be noted that the examples described below are exemplary and are only used to explain the present application, and should not be construed as limiting the present application. Where specific techniques or conditions are not specified in the examples, the techniques or conditions described in the literature in this area or the product specifications are used. Reagents or instruments used without manufacturer's indication are all commercially available conventional products.

[0028] The samples to be tested were sent to a testing agency for analysis of their main chemical components. The test results are shown in Table 1 below: Table 1 Calculation shows that, Fe oxidation rate = 1-1.04 / 21.08 = 95.07%.

[0029] S oxidation rate = 1-1.18 / 18.40 = 93.59%.

[0030] As oxidation rate = 1-0.67 / 20.30 = 96.70%.

[0031] Example 1 This embodiment provides a method for calculating the oxidation rates of S, As, and Fe in a biological oxidation process. The method for calculating the oxidation rates of S, As, and Fe in the above-mentioned sample to be tested in the biological oxidation process specifically includes the following steps: S1. Preparation of gold concentrate MLA sample: First, the gold concentrate was mixed and divided, and 5 g of the gold concentrate was taken as an MLA sample, recorded as MLA sample 1, for later use. The volume ratio of the resin to the curing agent was 2:1.

[0032] Take a gold concentrate sample, record it as sample 1, and weigh G1=100g.

[0033] Take a standard sieve and sieve 1kg of the mixed gold concentrate sample. The particle size is less than 0.010mm, which is recorded as sample 2; the particle size is 0.010-0.037mm, which is recorded as sample 3; the particle size is 0.037-0.074mm, which is recorded as sample 4; the particle size is greater than 0.074mm, which is recorded as sample 5; 5 g of particles of different sizes were taken to make MLA samples, recorded 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 were G2=165 g, G3=298 g, G4=413 g, and G5=104 g, and G2+G3+G4+G5+5×4=1 kg.

[0034] S2. Preparation of oxidation slag MLA samples: Sample 1, sample 2, sample 3, sample 4, and sample 5 were subjected to biological oxidation experiments under the same conditions. After the oxidation was completed, biological oxidation slag was obtained.

[0035] The backscattering pattern of sample 1 before biological oxidation slag pretreatment is as follows Figure 1 As shown in the figure, points 1 and 2 are pyrite, and point 3 is an oxide film. This shows that after the gold concentrate is bio-oxidized, an oxide film forms on the outer edge of the slag, affecting the detection of the relative mineral content.

[0036] The above-mentioned biological oxidation slag samples were mixed separately. The biological oxidation slag of sample 1 was recorded as sample 1', and 5 g was taken to make MLA sample 1'. The remaining weight of sample 1' was recorded as G1'=54 g; similarly, 5 g was taken to make MLA sample 2', the biological oxidation slag of sample 2 was recorded as sample 2', and the remaining weight was recorded as G2'=66.42 g; and so on, the biological oxidation slag of sample 3 was recorded as sample 3', and the remaining weight was recorded as G3'=134.97 g; the remaining weight of sample 4' was G4'=185.85 g; and the remaining weight of sample 5' was G5'=49.92 g.

[0037] Samples 1', 2', 3', 4' and 5' were subjected to biological oxidation slag pretreatment, respectively. The conditions were as follows: the biological oxidation slag was immersed in oxalic acid with a volume fraction of 2% at a liquid-solid ratio of 8:1, the pretreatment temperature was 40°C, the pretreatment time was 1.5 hours, and the stirring speed during pretreatment was 250 r / min.

[0038] The weight of sample 1'' corresponding to 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'', which are G2''=53.28g, G3''=109.98g, G4''=149.67g, and G5''=40.54g respectively.

[0039] Take 1.71g (calculated from G1'' / G1×5g) of sample 1'' to prepare MLA sample 1'' for later use, take 1.61g (calculated from G2'' / G2×5g) of sample 2'' to prepare MLA sample 2'' for later use, take 1.85g (calculated from G3'' / G3×5g) of sample 3'' to prepare MLA sample 3'' for later use, and so on, take 1.81g (calculated from G4'' / G4×5g) ​​to prepare MLA sample 4'' for later use, and take 1.95g (calculated from G5'' / G5×5g) of MLA sample 5'' for later use.

[0040] S3. Sample Testing: MLA samples 1-5 and MLA samples 1''-5'' were placed in a grinder and polisher for 10 minutes at a single-point pressure of 10 Newtons, a speed of 200 rpm, and a grinding time of 10 minutes. The samples 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 injection, the samples were then analyzed using an automated mineral analysis system.

[0041] S4. Calculation of relative content of gold concentrate by correction K1: After testing, the relative content of pyrite mineral composition in MLA sample 1 is X1=17.31%, and the relative content of pyrite mineral composition in MLA samples 2-5 is X2=17.84%, X3=17.76%, X4=17.74%, and X5=17.65%. K1=[(G2 / 980)×X2+(G3 / 980)×X3+(G4 / 980)×X4+(G5 / 980)×X5] / X1=1.03.

[0042] The relative content of biological oxidation slag is corrected by K2 calculation: the relative content of pyrite mineral composition in MLA sample 1'' is X1''=2.52%, 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%, then K2=(G2''×X2''+G3''×X3''+G4''×X4''+G5''×X5'') / (G2''+G3''+G4''+G5'') / X1''=1.11.

[0043] S5. Oxidation rate calculation: After testing, the sulfides in MLA sample 1 and sample 1'' include: pyrite, arsenopyrite, chalcopyrite, realgar, galena, and sphalerite; the Fe, S, and As contents are the average values ​​obtained by multiple point analyses of the minerals in the samples through scanning electron microscopy, as shown in Tables 2 to 4 below: Table 2 Table 3 Table 4 The relative content of minerals was detected by an automatic mineralogical analysis system.

[0044] Oxidation slag yield F=(G1'+5) / G1=0.59; Fe oxidation rate = 1-K2×(X1'×A1+Y1'×A2+Z1'×A3)×F / [K1×(X1×M1+Y1×M2+Z1×M3)] =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% 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)] =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% As oxidation rate = 1-K2×(Y1'×C1+O1'×C2)×F / [K1×(Y1×P1+O1×P2)] =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%.

[0045] It can be seen that the test results of this method are reliable. In addition, this method does not require the sample to be treated with strong acid or alkali, is environmentally friendly, and easy to operate.

[0046] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are merely examples, and any embodiments having substantially the same structure and effect as the technical concept within the scope of the present application are all included in the technical scope of the present application. In addition, without departing from the scope of the present application, any other embodiments that can be conceived by those skilled in the art and that combine some of the constituent elements in the embodiments are also included in the scope of the present application.

Claims

1. A method for calculating the oxidation rates of S, As and Fe in a biological oxidation process, characterized in that: The following steps are involved: S1. Preparation of gold concentrate MLA sample: Mix and divide the gold concentrate, take 5g of gold concentrate as MLA sample, recorded as MLA sample 1; take a gold concentrate sample, recorded as sample 1, and weigh G1; 1 kg of gold concentrate sample was sieved, and the particle size was less than 0.010 mm, recorded as sample 2; the particle size was 0.010-0.037 mm, recorded as sample 3; the particle size was 0.037-0.074 mm, recorded as sample 4; the particle size was greater than 0.074 mm, recorded as sample 5; 5 g of sample 2, sample 3, sample 4, and sample 5 were taken respectively to make MLA samples, which were recorded as MLA sample 2, MLA sample 3, MLA sample 4, and MLA sample 5 respectively; the remaining weights of sample 2, sample 3, sample 4, and sample 5 were G2, G3, G4, and G5, respectively, and G2+G3+G4+G5+5×4=1 kg; S2. Preparation of oxidation slag MLA samples: Sample 1 and the remaining samples 2-5 were subjected to biological oxidation experiments under the same conditions. After the oxidation was completed, biological oxidation slag was obtained; The biological oxidation residue of sample 1 is recorded as sample 1', 5 g is taken to make MLA sample 1', and the remaining weight of sample 1' is recorded as G1'; the biological oxidation residue of sample 2 is recorded as sample 2', and the remaining weight of sample 2' is recorded as G2'; the biological oxidation residue of sample 3 is recorded as sample 3', and the remaining weight of sample 3' is recorded as G3'; and so on, the remaining weight of sample 4' is recorded as G4'; the remaining weight of sample 5' is recorded as weight G5'; Samples 1', 2', 3', 4' and 5' were pretreated with biological oxidation slag respectively. The weight of sample 1'' corresponding to 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 to prepare MLA sample 1'' for later use; take sample 2'' of G2'' / G2×5g to prepare MLA sample 2'' for later use; take sample 3'' of G3'' / G3×5g to prepare MLA sample 3'' for later use, and so on, prepare MLA sample 4'' for later use and MLA sample 5'' for later use; S3. Sample testing: MLA samples 1-5 and MLA samples 1''-5'' were subjected to grinding and polishing operations and then carbonized and placed in an automatic mineral analysis system for measurement; S4. Calculation of K1 correction for relative content 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; The relative content of biological oxidation slag was corrected by 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''; 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 tested include pyrite, arsenopyrite, chalcopyrite, realgar, galena, and sphalerite; Among them, the Fe contents in pyrite, arsenopyrite, and chalcopyrite are M1, M2, and M3 respectively; The S contents in pyrite, arsenopyrite, chalcopyrite, realgar, galena, and sphalerite are N1, N2, N3, N4, N5, and N6 respectively; The As content in arsenopyrite and realgar is P1 and P2 respectively; The sulfides in MLA sample 1' of the bio-oxidation slag were pyrite, arsenopyrite, chalcopyrite, realgar, galena, and sphalerite; Among them, the Fe contents in pyrite, arsenopyrite, and chalcopyrite are A1, A2, and A3 respectively; The S contents in pyrite, arsenopyrite, chalcopyrite, realgar, galena and sphalerite are B1, B2, B3, B4, B5 and B6 respectively; The As content in arsenopyrite and realgar is C1 and C2 respectively; The yield of biological oxidation slag F=(G1'+5) / G1; then 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 biological oxidation process according to claim 1, characterized in that: In step S2, the biological oxidation slag pretreatment includes the following steps: immersing the biological oxidation slag in oxalic acid with a volume fraction of 1%-3% according to a liquid-solid ratio of (6-10):1, the pretreatment temperature is 30-45°C, and the pretreatment time is 1-2h.

3. The method for calculating the oxidation rates of S, As and Fe in the biological 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 contents of the minerals in the sample by multiple point analyses using a scanning electron microscope.

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

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