A method for strengthening the chemical oxidation of arsenopyrite

Abstract

The invention discloses a method for strengthening the chemical oxidation of arsenopyrite. Specifically, a certain amount of pyrite is added to an arsenopyrite chemical oxidation system, and the acid-generating property of pyrite during oxidation is utilized to reduce the pH value of the system, so that ferric hydroxide precipitates in a passivation layer are converted into ferric arsenate. Pyrite is also utilized as an Fe source to increase the Fe / As molar ratio in the system, so as to reduce the stability of the ferric arsenate in the passivation layer. Since Fe(III) and Fe(II) on sulfur defect sites on the surface of pyrite can activate small molecule environmental media, the generated reactive oxygen species (ROS) have an oxidizing ability for arsenopyrite, thereby achieving the purpose of strengthening the oxidation of arsenopyrite. The method of the invention increases the arsenic leaching rate in the arsenopyrite chemical oxidation system by nearly 3 times at most, and has a significant strengthening effect on the oxidation of arsenopyrite. At the same time, the method is simple in process, mild in conditions, and easy to operate.

Description

Technical Field

[0001] The invention relates to the technical field of sulfide ore metallurgy, and in particular to a method for chemical oxidation of arsenopyrite. Background Art

[0002] Gold is a strategic mineral resource in short supply in my country. However, with the continued exploitation of gold mines, easily processed gold resources are gradually depleting, and the proportion of refractory gold resources in the gold industry's raw materials is increasing. Arsenic-containing gold ores are among the most difficult to process. The gold in these ores is primarily encapsulated in gold-bearing minerals such as arsenopyrite and pyrite in the form of microscopic, submicroscopic, or lattice gold. Fine and ultrafine grinding methods are difficult to dissociate into individual components. Furthermore, the encapsulation of fine gold by these gold-bearing minerals and the competition, inhibition, or gold-robbing effects of harmful elements during the gold extraction process make effective gold recovery difficult during subsequent cyanidation. Therefore, to recover the gold from these ores, pretreatment techniques such as pre-oxidation and arsenic removal are commonly used to dissociate and expose the encapsulated gold, thereby improving gold recovery rates.

[0003] At present, common pre-oxidation technologies mainly include roasting oxidation, hot pressing oxidation, chemical oxidation, biological oxidation, etc. Among them, compared with other oxidation processes, chemical oxidation has the advantages of easy operation, strong adaptability, fast reaction speed, and short processing cycle. However, during the chemical oxidation of arsenopyrite, due to the different dissolution rates of Fe, As, and S elements, a passivation layer composed of elemental sulfur, metal oxides, etc. will be formed on the surface of the mineral, hindering the further oxidation and dissolution of arsenopyrite, while causing secondary encapsulation of gold, thereby reducing the gold recovery rate in the subsequent gold leaching process. Therefore, the method of strengthening the chemical oxidation of arsenopyrite by reducing the formation of the passivation layer during the chemical oxidation of arsenopyrite is the key to promoting the advancement of chemical pre-oxidation technology for difficult-to-leach gold ores. Summary of the Invention

[0004] In view of this, the present disclosure provides a method for enhancing the chemical oxidation of arsenopyrite to solve the problem that a passivation layer is formed on the mineral surface during the current chemical oxidation process of arsenopyrite, thereby reducing the gold recovery rate.

[0005] The core mechanism of the method for strengthening the chemical oxidation of arsenopyrite is as follows: a certain amount of pyrite is added to the arsenopyrite chemical oxidation system, one purpose of which is to utilize the acid-generating property of pyrite during oxidation to reduce the pH value of the system and convert the ferric hydroxide precipitate in the passivation layer into ferric arsenate; a second purpose of which is to use pyrite as an Fe source to increase the Fe / As molar ratio in the system and reduce the stability of the ferric arsenate in the passivation layer; a third purpose of which is that due to the presence of sulfur defect sites on the surface of pyrite, Fe(III) and Fe(II) on the sulfur defect sites can activate small molecular environmental media such as H2O and O2, and the generated reactive oxygen free radicals (ROS, Reactive Oxygen Species) have a strong oxidizing ability to arsenopyrite; therefore, the addition of pyrite to the arsenopyrite chemical oxidation system strengthens the oxidation of arsenopyrite.

[0006] To achieve the above-mentioned object of the invention, the method for enhancing the chemical oxidation of arsenopyrite comprises:

[0007] An arsenopyrite oxidation system is prepared, wherein the oxidation system comprises an arsenopyrite leaching sample and a pyrite leaching sample, and the mass ratio of the arsenopyrite leaching sample to the pyrite leaching sample is not greater than 1:1.

[0008] In the present disclosure and possible embodiments, the method for preparing an arsenopyrite oxidation system comprises:

[0009] The arsenopyrite leaching sample and the pyrite leaching sample are placed in a basic salt solution, and the initial pH of the system is adjusted to 2-9 to obtain the oxidation system.

[0010] In the present disclosure and possible embodiments, the slurry concentration of the arsenopyrite leaching sample in the basic salt solution is 1-2%;

[0011] The slurry concentration of the pyrite leaching sample in the basic salt solution is 1-4%.

[0012] In the present disclosure and possible embodiments, the basic salt solution composition is: (NH4)2SO4 is 2 to 4 g / L, KCl is 0.1 to 0.3 g / L, K2HPO4 is 0.3 to 0.7 g / L, MgSO4·7H2O is 0.3 to 0.7 g / L, Ca(NO3)2 is 0.01 to 0.03 g / L, and the rest is deionized water.

[0013] In the present disclosure and possible embodiments, dilute sulfuric acid and potassium hydroxide solution are used to adjust the initial pH of the system, wherein the concentration of the dilute sulfuric acid is 3 to 8 mol / L; and the concentration of the potassium hydroxide solution is 3 to 8 mol / L.

[0014] In the present disclosure and possible embodiments, the method further includes:

[0015] The arsenopyrite oxidation system is chemically oxidized to enhance the oxidation of the arsenopyrite.

[0016] In the present disclosure and possible embodiments, the method of chemically oxidizing the arsenopyrite oxidation system comprises:

[0017] The oxidation system is placed in an air bath constant temperature oscillator for oscillation oxidation at 20-50° C. and 100-180 r / min for 18-25 days.

[0018] In the present disclosure and possible embodiments, the particle size of the arsenopyrite leaching sample and the pyrite leaching sample is -0.03 to 0.05 mm.

[0019] In the present disclosure and possible embodiments, the method for preparing the arsenopyrite leaching sample includes:

[0020] Arsenic pyrite lumps meeting the purity requirements are taken, crushed to -1 to 3 mm, and then the gangue impurities are selected and picked out. The ore is ground to -0.1 to 0.3 mm for sorting, and the resulting concentrate is ground to -0.03 to 0.05 mm as a leaching sample.

[0021] In the present disclosure and possible embodiments, the method for preparing the pyrite leaching sample includes:

[0022] Take pyrite lumps with purity that meets the requirements, crush them to -1~3mm, pick out gangue impurities, grind them to -0.1~0.3mm for sorting, and the obtained concentrate is ground to -0.03~0.05mm as leaching sample.

[0023] The present invention has the following beneficial effects:

[0024] (1) The present invention utilizes pyrite as an Fe source and adds it to the chemical oxidation system of arsenopyrite, thereby increasing the Fe / As molar ratio of the system and thereby increasing the hydrated iron oxide content in the system; utilizing the strong adsorption characteristics of hydrated iron oxide, the agglomeration of ferric arsenate in the passivation layer is enhanced, thereby reducing the crystallization rate of ferric arsenate, reducing the volume and specific surface area of ​​ferric arsenate crystals, deteriorating the surface morphology of the passivation layer, and reducing the stability of the passivation layer, thereby increasing the leaching rate of arsenic in arsenopyrite.

[0025] (2) The present invention utilizes the property of pyrite to generate acid during oxidation and adds pyrite to the arsenopyrite chemical oxidation system to achieve the purpose of lowering the pH of the system. When the pH of the system is lowered, the ferric hydroxide in the passivation layer is converted into ferric arsenate. Under the influence of the increase in the Fe / As molar ratio of the system, the ferric arsenate in the passivation layer is further dissolved, and the arsenic ions are converted into AsO4 3-The arsenic is released into the solution in the form of pyrite, thereby increasing the leaching rate of arsenic from arsenopyrite. Compared with the chemical oxidation system without pyrite addition, the leaching rate of arsenic from arsenopyrite is increased by nearly 3 times, which is a significant effect. At the same time, this method is simple in process, mild in conditions, and easy to operate.

[0026] (3) Because the S-S bond on the pyrite surface breaks and loses a S atom under the action of mechanical or other forces, the resulting unsaturated S(-I) can oxidize the adjacent Fe(II). The resulting Fe(III) can oxidize H2O to produce adsorbed ·OH, and O2 can directly obtain two electrons from the Fe(II) site on the pyrite surface to produce H2O2. At the same time, ROS such as ·OH and H2O2 can act as oxidants for arsenopyrite. Therefore, the present invention enhances the oxidation of arsenopyrite by adding pyrite, thereby improving the leaching rate of arsenic in arsenopyrite.

[0027] (4) The pyrite used in the present invention has the characteristics of being symbiotic with arsenopyrite, and has the advantages of being easy to obtain, high in abundance, and low in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and other objects, features and advantages of the present disclosure will become more apparent through the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0029] Figure 1 The Fourier transform infrared spectra of the leaching residue after 18 days of leaching in the chemical oxidation system of Comparative Example 1, Example 1 and Implementation Example 2 are shown;

[0030] Figure 2 The Fourier transform infrared spectra of the residue after 18 days of leaching in the chemical oxidation system of Comparative Example 2 and Example 3;

[0031] Figure 3 Graph showing the change of As concentration over time in the chemical oxidation system leachate of Comparative Example 1, Example 1, and Implementation Example 2;

[0032] Figure 4 The graph of the change of As concentration in the leachate of the chemical oxidation system of Comparative Example 2 and Example 3 over time;

[0033] Figure 5 The graph of the change of As concentration in the leachate of the chemical oxidation system of Comparative Example 3 and Example 4 over time;

[0034] Figure 6 The graph of pH change over time of the chemical oxidation system of Comparative Example 3 and Example 4;

[0035] Figure 7 1 is a graph showing the change in the cumulative amount of ·OH in the leachate of the chemical oxidation system of Comparative Example 1, Example 1, and Implementation Example 2 over time;

[0036] Figure 8 Graph showing the change in the cumulative amount of ·OH in the leachate of the chemical oxidation system of Comparative Example 3 and Example 4 over time. DETAILED DESCRIPTION

[0037] The present disclosure is described below based on embodiments, but it is worth noting that the present disclosure is not limited to these embodiments. In the detailed description of the present disclosure below, some specific details are described in detail. However, for the parts not described in detail, those skilled in the art can also fully understand the present disclosure.

[0038] The inventors of the present application have discovered that the addition of paragenetic minerals to the arsenopyrite chemical oxidation system can achieve effective regulation of the passivation layer in the arsenopyrite chemical oxidation system. In particular, the addition of pyrite can lower the pH of the system, inducing the conversion of ferric hydroxide precipitates in the passivation layer to ferric arsenate precipitates, which not only increases the Fe / As molar ratio of the system and enhances the agglomeration of ferric arsenate in the passivation layer, but also reduces its crystallization rate, reduces the volume and specific surface area of ​​ferric arsenate crystals, deteriorates the surface morphology of the passivation layer, and reduces the stability of the passivation layer. Furthermore, studies have confirmed that Fe(II) and Fe(III) on the sulfur defect sites on the surface of pyrite can activate small molecule environmental mediators, and the generated ROS have strong oxidizing properties and can non-selectively oxidize variable valence metals while affecting the oxidation process of minerals. Therefore, the inventors of the present application have achieved the enhancement of the chemical oxidation of arsenopyrite by adding pyrite to the arsenopyrite chemical oxidation system.

[0039] Based on the above findings of the inventors, the technical solution of the present invention is as follows:

[0040] The method for enhancing the chemical oxidation of arsenopyrite comprises adding a certain amount of pyrite to an arsenopyrite chemical oxidation system, utilizing the acid-generating property of pyrite during oxidation to lower the pH of the system, converting the ferric hydroxide precipitate in the passivation layer into ferric arsenate, and using pyrite as an Fe source to increase the Fe / As molar ratio in the system and reduce the stability of the ferric arsenate in the passivation layer. Since Fe(III) and Fe(II) on the sulfur defect sites on the pyrite surface can activate small molecule environmental mediators, the generated ROS have an oxidizing ability for arsenopyrite, thereby enhancing the oxidation of arsenopyrite.

[0041] Preferably, the mass ratio of arsenopyrite to pyrite in the system should be greater than 1:1. Reducing the ore ratio can effectively enhance the leaching rate of arsenic from arsenopyrite. However, when the ore ratio is greater than 1:1, the ferric arsenate content in the passivation layer increases, and the growth rate of ferric arsenate crystals exceeds the nucleation rate, resulting in large crystal size, high crystal quality, and a stable passivation layer structure, which is not conducive to the oxidation of arsenopyrite.

[0042] Based on the above technical solution, the present invention discloses a method for enhancing the chemical oxidation of arsenopyrite as in any embodiment of the present invention, comprising the following steps:

[0043] (1) The arsenopyrite blocks were crushed and ground to prepare the leaching samples.

[0044] In a specific embodiment, the arsenopyrite block is taken from an iron mine in Chifeng, Inner Mongolia.

[0045] In one embodiment, step (1) comprises: taking a high-purity arsenopyrite lump, crushing it to -1 to 3 mm, sorting out gangue impurities, grinding it to -0.1 to 0.3 mm, and then placing it on a shaking table for sorting. The resulting concentrate is ground to -0.03 to 0.05 mm as a leaching sample. Chemical analysis of the arsenopyrite sample reveals the following elemental mass fractions: 43 to 47% As, 32 to 36% Fe, and 17 to 21% S.

[0046] (2) The pyrite blocks were crushed and ground to prepare leaching samples.

[0047] In a specific embodiment, the pyrite block is taken from an iron mine in Guilin, Guangxi.

[0048] In a specific embodiment, step (2) specifically includes: taking high-purity pyrite lumps, crushing them to -1 to 3 mm, and then sorting out gangue impurities, grinding them to -0.1 to 0.3 mm, and then putting them into a shaking table for sorting. The resulting concentrate is ground to -0.03 to 0.05 mm as a leaching sample.

[0049] (3) The arsenopyrite leaching sample and the pyrite leaching sample were placed in a basic salt solution, and the initial leaching pH was adjusted to 2-9 using dilute sulfuric acid and potassium hydroxide solution to obtain an oxidation system.

[0050] In a specific embodiment, the basic salt solution composition is: (NH4)2SO4 is 2-4 g / L, KCl is 0.1-0.3 g / L, K2HPO4 is 0.3-0.7 g / L, MgSO4·7H2O is 0.3-0.7 g / L, Ca(NO3)2 is 0.01-0.03 g / L, and the rest is deionized water.

[0051] In a specific embodiment, the slurry concentration of the arsenopyrite leaching sample in the solution is 1-2%.

[0052] In a specific embodiment, the slurry concentration of the pyrite leaching sample in the solution is 1-4%.

[0053] In a specific embodiment, the mass ratio of the arsenopyrite sample to the pyrite sample in the system is no greater than 1:1.

[0054] In a specific embodiment, the concentration of dilute sulfuric acid is 3-8 mol / L.

[0055] In a specific embodiment, the concentration of the potassium hydroxide solution is 3-8 mol / L.

[0056] (4) The oxidation system is placed in an air bath constant temperature oscillator for oscillation oxidation at 20-50°C and 100-180 r / min for 18-25 days, thereby achieving enhanced oxidation of arsenopyrite.

[0057] The following are specific embodiments of the present disclosure:

[0058] Example 1

[0059] The method for enhancing the chemical oxidation of arsenopyrite in this embodiment specifically comprises the following steps:

[0060] Step 1: Take high-purity arsenopyrite ore, crush it to -2mm, select and remove gangue impurities, grind it to -0.25mm, and then put it into a shaking table for sorting. The resulting concentrate is ground to -0.045mm as a leaching sample.

[0061] Step 2: Take the pyrite lump with higher purity and crush it to -2mm, then pick out the gangue impurities, grind it to -0.25mm, and then put it into the shaking table for sorting. The obtained concentrate is ground to -0.045mm as the leaching sample.

[0062] Step 3: Weigh 3.0 g of (NH4)2SO4, 0.1 g of KCl, 0.5 g of K2HPO4, 0.5 g of MgSO4·7H2O, and 0.01 g of Ca(NO3)2, add them to 1000 mL of deionized water, stir thoroughly and dissolve them to form a basic salt solution.

[0063] Step 4: Weigh 2 g of arsenopyrite leaching sample and 2 g of pyrite leaching sample and place them in a basic salt solution, and use 5 mol / L dilute sulfuric acid to adjust the initial leaching pH to 2 to obtain an arsenopyrite oxidation system.

[0064] Step 5: Place the oxidation system in an air bath constant temperature oscillator at 30° C. and 110 r / min for 18 days for oscillation oxidation, thereby achieving enhanced oxidation of arsenopyrite.

[0065] Example 2

[0066] Compared with Example 1, this embodiment differs in that the preparation parameters of step 4 are changed as follows:

[0067] Step 4: Weigh 2 g of arsenopyrite leaching sample and 4 g of pyrite leaching sample and place them in a basic salt solution, and use 5 mol / L dilute sulfuric acid to adjust the initial leaching pH to 2 to obtain an arsenopyrite oxidation system.

[0068] Example 3

[0069] Compared with Example 1, this embodiment differs in that the preparation parameters of step 4 are changed as follows:

[0070] Step 4: Weigh 2 g of arsenopyrite leaching sample and 4 g of pyrite leaching sample and place them in a basic salt solution, and use 5 mol / L dilute sulfuric acid to adjust the initial leaching pH to 5 to obtain an arsenopyrite oxidation system.

[0071] Example 4

[0072] Compared with Example 1, this embodiment differs in that the preparation parameters of step 4 are changed as follows:

[0073] Step 4: Weigh 2 g of arsenopyrite leaching sample and 4 g of pyrite leaching sample and place them in a basic salt solution, and use 5 mol / L potassium hydroxide solution to adjust the initial leaching pH to 9 to obtain an arsenopyrite oxidation system.

[0074] Comparative Example 1

[0075] This comparative example adopts a single arsenopyrite oxidation system, and the specific preparation steps are as follows:

[0076] Step 1: Prepare arsenopyrite leaching sample:

[0077] Take high-purity arsenopyrite lumps, crush them to -2mm, pick out gangue impurities, grind them to -0.25mm, and then put them into a shaking table for sorting. The resulting concentrate is ground to -0.045mm as a leaching sample.

[0078] Step 2: Prepare basic salt solution:

[0079] Weigh 3.0 g of (NH4)2SO4, 0.1 g of KCl, 0.5 g of K2HPO4, 0.5 g of MgSO4·7H2O, and 0.01 g of Ca(NO3)2, add them to 1000 mL of deionized water, stir thoroughly and dissolve them to form a basic salt solution.

[0080] Step 3: Prepare arsenopyrite oxidation system:

[0081] 2 g of arsenopyrite leaching sample was weighed and placed in a basic salt solution, and the initial leaching pH was adjusted to 2 using 5 mol / L dilute sulfuric acid to obtain an arsenopyrite oxidation system.

[0082] Step 4: Complete chemical oxidation of arsenopyrite:

[0083] The arsenopyrite oxidation system was placed in an air bath constant temperature oscillator for 18 days at 30°C and 110 r / min.

[0084] Comparative Example 2

[0085] Compared with Comparative Example 1, this comparative example differs in that the preparation parameters of step 3 are changed, as follows:

[0086] Step 3: Weigh 2 g of arsenopyrite leaching sample and place it in a basic salt solution, and use a 5 mol / L dilute sulfuric acid solution to adjust the initial leaching pH to 5 to obtain an arsenopyrite oxidation system.

[0087] Comparative Example 3

[0088] Compared with Comparative Example 1, this comparative example differs in that the preparation parameters of step 3 are changed, as follows:

[0089] Step 3: Weigh 2 g of arsenopyrite leaching sample and place it in a basic salt solution, and use 5 mol / L potassium hydroxide solution to adjust the initial leaching pH to 9 to obtain an arsenopyrite oxidation system.

[0090] Test Case

[0091] 1. In the oxidation systems of Examples 1-3 and Comparative Examples 1-2, the Fourier transform infrared spectra of the leached residues are as follows: Figure 1 and Figure 2 As shown, at 823.16cm -1 The absorption peak observed at the wavelength is due to the stretching vibration of the As(V)-O bond of As(V)-O-Fe in the ferric arsenate compound. Figure 1 and Figure 2 As shown, the tensile vibration peak intensity of the ferric arsenate compound in the embodiment is less than that in the comparative example, which proves that the addition of pyrite can reduce the content of the ferric arsenate compound in the passivation layer.

[0092] 2. The As concentration in the leaching solution of the oxidation system of Examples 1-4 and Comparative Examples 1-3 is as follows: Figure 3-Figure 5 As shown, it was found that under the same initial pH conditions, the As concentration in the leaching solution of the oxidation system of the embodiment example was higher than that of the comparative example, which proved that the addition of pyrite can enhance the oxidation of arsenopyrite.

[0093] 3. The pH changes over time in the oxidation systems of Example 4 and Comparative Example 3 are shown in FIG. Figure 6 As shown, it was found that the pH of the oxidation system of the embodiment was lower than that of the comparative example, indicating that the addition of pyrite can reduce the pH of the arsenopyrite oxidation system.

[0094] 4. The trends of the cumulative amount of ·OH in the oxidation system of Example 1, Example 2, Example 4 and Comparative Example 1 and Comparative Example 3 over time are shown in FIG. Figure 7 and Figure 8 It shows that the addition of pyrite can increase the concentration of ·OH in the system, that is, the concentration of ROS.

[0095] In summary, the present invention adds the paragenetic mineral pyrite to the arsenopyrite chemical oxidation system, reduces the pH of the oxidation system, and realizes the regulation of the passivation layer in the arsenopyrite chemical oxidation system. At the same time, the ROS generated by the activation of the small molecule environmental medium by Fe (II) and Fe (III) on the sulfur defect sites on the surface of pyrite has oxidizing characteristics, thereby achieving the purpose of strengthening the oxidation of arsenopyrite. Therefore, using this method, when the initial pH of the oxidation system is 9, the arsenopyrite slurry concentration is 2%, and the pyrite slurry concentration is 4%, after leaching for 18 days, the As concentration in the leachate is 777.9 mg / L, while the As concentration in the leachate in the arsenopyrite single system is only 196.5 mg / L, that is, the As leaching rate is increased by nearly 3 times.

[0096] The above-described embodiments are merely examples of implementation methods of the present disclosure, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art may make various modifications, equivalent substitutions, and improvements without departing from the scope of the present disclosure, and these modifications are all within the scope of protection of the present disclosure. Therefore, the scope of protection of the present invention shall be based on the appended claims.

Claims

1. A method for enhancing the chemical oxidation of arsenopyrite, characterized in that: include: preparing an arsenopyrite oxidation system, the oxidation system comprising an arsenopyrite leaching sample and a pyrite leaching sample, wherein the mass ratio of the arsenopyrite leaching sample to the pyrite leaching sample is no greater than 1:1; The method for preparing the arsenopyrite oxidation system comprises: placing the arsenopyrite leaching sample and the pyrite leaching sample in a basic salt solution, adjusting the initial pH of the system to 2-9, to obtain the oxidation system; The slurry concentration of the arsenopyrite leaching sample in the basic salt solution is 1-2%; The slurry concentration of the pyrite leaching sample in the basic salt solution is 1 to 4%; The basic salt solution comprises: 2-4 g / L (NH4)2SO4, 0.1-0.3 g / L KCl, 0.3-0.7 g / L K2HPO4, 0.3-0.7 g / L MgSO4·7H2O, 0.01-0.03 g / L Ca(NO3)2, and the rest is deionized water.

2. The method for enhancing chemical oxidation of arsenopyrite according to claim 1, wherein: The initial pH of the system is adjusted by using dilute sulfuric acid and potassium hydroxide solution, wherein the concentration of the dilute sulfuric acid is 3-8 mol / L; and the concentration of the potassium hydroxide solution is 3-8 mol / L.

3. The method for enhancing chemical oxidation of arsenopyrite according to claim 1 or 2, characterized in that: Also includes: The arsenopyrite oxidation system is chemically oxidized to enhance the oxidation of the arsenopyrite.

4. The method for enhancing chemical oxidation of arsenopyrite according to claim 3, characterized in that: The method for chemically oxidizing the arsenopyrite oxidation system comprises: The oxidation system is placed in an air bath constant temperature oscillator for oscillation oxidation at 20-50° C. and 100-180 r / min for 18-25 days.

5. The method for enhancing chemical oxidation of arsenopyrite according to claim 1, 2 or 4, characterized in that: The particle size of the arsenopyrite leaching sample and the pyrite leaching sample is -0.03 to 0.05 mm.

6. The method for enhancing chemical oxidation of arsenopyrite according to claim 5, characterized in that: The method for preparing the arsenopyrite leaching sample comprises: Arsenic pyrite lumps meeting the purity requirements are taken, crushed to -1 to 3 mm, and then the gangue impurities are selected and picked out. The ore is ground to -0.1 to 0.3 mm for sorting, and the resulting concentrate is ground to -0.03 to 0.05 mm as a leaching sample.

7. The method for enhancing chemical oxidation of arsenopyrite according to claim 6, characterized in that: The method for preparing the pyrite leaching sample comprises: Take pyrite lumps with purity that meets the requirements, crush them to -1~3mm, pick out gangue impurities, grind them to -0.1~0.3mm for sorting, and the obtained concentrate is ground to -0.03~0.05mm as leaching sample.

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