A method for activating and recovering pyrite in cyanidation tailings

Abstract

The present invention provides a method for activating and recovering pyrite in cyanidation tailings. The activation and recovery method includes: (1) adding a reagent to the cyanidation tailings for mixing treatment to obtain pulp; (2) performing activation treatment on the pulp obtained in step (1), and then performing flotation separation treatment to obtain pyrite. In the present invention, by sequentially performing pretreatment, activation treatment, and flotation separation on the cyanidation tailings, the inhibitory effect of cyanide on pyrite can be eliminated, its floatability can be restored to the original state and improved, thereby improving the recovery rate of pyrite. The overall operation process is simple and convenient. Compared with the traditional activation flotation process, the recovery rate is increased by 30%.

Description

Technical Field

[0001] The present invention belongs to the technical field of cyanide tailing treatment and relates to a method for activating and recovering pyrite in cyanide tailings. Background Art

[0002] As the waste residue produced by gold production enterprises in China, cyanide tailings contain unextracted gold, silver, copper, lead, zinc, iron, sulfur, etc., and the grades are generally higher than the minimum industrial grade, which is an important secondary resource. Therefore, it is of great significance to recover valuable elements from cyanide tailings for realizing resource recovery.

[0003] Since pyrite in cyanide tailings is inhibited by cyanide, the technical indexes obtained by using the traditional acidification - copper sulfate activation flotation process flow and reagent system are not ideal. Existing research mostly adopts the treatment method of cyanide - containing wastewater to eliminate the inhibition of free cyanide ions on pyrite, while there is less research on eliminating complex cyanide ions. To recover pyrite in cyanide tailings, it is necessary to eliminate the inhibitory effect of cyanide on pyrite in the flotation system, restore its floatability and further improve its activation. Therefore, it is urgent to design and study a method for activating and recovering pyrite in cyanide tailings to meet the requirements of actual industrial production. Summary of the Invention

[0004] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a method for activating and recovering pyrite in cyanide tailings. In the present invention, after the cyanide tailings are successively subjected to pretreatment, activation treatment, flotation separation, cleaning, scavenging and re - scavenging, the inhibitory effect on pyrite in the cyanide tailings can be eliminated, its floatability can be restored to the original state and improved, thereby increasing the recovery rate of pyrite. The overall operation process is simple and convenient. Compared with the traditional activation flotation process, the recovery rate is increased by 30%.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] The present invention provides a method for activating and recovering pyrite in cyanide tailings, and the activation and recovery method includes:

[0007] (1) Adding reagents to the cyanide tailings for mixing treatment to obtain pulp;

[0008] (2) Performing activation treatment on the pulp obtained in step (1), and then through flotation separation treatment, pyrite is obtained;

[0009] The flotation separation includes roughing, cleaning, scavenging and re - scavenging treatments.

[0010] In the present invention, after the cyanidation tailings are successively subjected to pretreatment, activation treatment, and flotation separation treatment, the inhibitory effect of cyanide on pyrite can be eliminated, its floatability can be restored to the original state and improved, thereby increasing the recovery rate of pyrite. The overall operation process is simple and convenient. Compared with the traditional activation flotation process, the recovery rate is increased by 30%.

[0011] It should be noted that the pretreatment, activation treatment, and flotation separation treatment of the cyanidation tailings in the present invention are all essential. The mutual cooperation of each link can increase the recovery rate of pyrite. If any one of the links is missing, the recovery of pyrite will not reach the expected effect. This is because the pyrite in the cyanidation tailings is inhibited by cyanide during the cyanidation gold leaching process, and its floatability is poor. Without eliminating the inhibition of cyanide on pyrite and further activation before flotation separation, it is difficult to achieve a good flotation recovery effect.

[0012] As a preferred technical solution of the present invention, in step (1), before adding reagents to the cyanidation tailings for mixing treatment, the cyanidation tailings need to be pretreated, and the pretreatment is carried out as follows:

[0013] Adjust the concentration of the cyanidation tailings.

[0014] Preferably, the process of adjusting the concentration of the cyanidation tailings is carried out in a stirring device.

[0015] Preferably, the concentration is 10-40%, for example, it can be 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, but is not limited to the listed values. Other unlisted values within this numerical range are equally applicable.

[0016] More preferably, it is 20-30%, for example, it can be 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, but is not limited to the listed values. Other unlisted values within this numerical range are equally applicable.

[0017] As a preferred technical solution of the present invention, in step (1), the mixing treatment is stirring mixing.

[0018] Preferably, the time of the mixing treatment is 10-60 min, for example, it can be 10 min, 20 min, 30 min, 40 min, 50 min, 60 min, but is not limited to the listed values. Other unlisted values within this numerical range are equally applicable.

[0019] It is further preferably 30 to 40 minutes. For example, it can be 30 minutes, 31 minutes, 32 minutes, 33 minutes, 34 minutes, 35 minutes, 36 minutes, 37 minutes, 38 minutes, 39 minutes, 40 minutes, but is not limited to the listed values. Other unlisted values within this numerical range are equally applicable.

[0020] In the present invention, the mixing treatment time is specifically limited to 10 to 60 minutes because within this numerical range, the treatment agent reacts fully with the cyanide in the pulp. If it is not within the scope defined in the present invention, the reaction between the treatment agent and cyanide will be incomplete and the activation effect cannot be achieved. Further limiting it to 30 to 40 minutes is more conducive to the progress of the reaction.

[0021] As a preferred technical solution of the present invention, the medicament includes a pH adjuster and a pretreatment agent.

[0022] Preferably, the pretreatment agent is added to the cyanide tailings before the pH adjuster.

[0023] It should be noted that the reason for limiting the addition order of the pretreatment agent to the cyanide tailings before the pH adjuster in the present invention is that after adjusting the pH value, the oxidation of pyrite is caused during the stirring process. If the order is not like this, the surface of pyrite will be oxidized to form a hydrophilic film, resulting in difficult flotation.

[0024] Preferably, the addition amount of the medicament is 100 to 5000 g / t. For example, it can be 100 g / t, 500 g / t, 1000 g / t, 2000 g / t, 3000 g / t, 4000 g / t, 5000 g / t, but is not limited to the listed values. Other unlisted values within this numerical range are equally applicable.

[0025] It is further preferably 2000 to 4000 g / t. For example, it can be 2000 g / t, 2200 g / t, 2400 g / t, 2600 g / t, 2800 g / t, 3000 g / t, 3200 g / t, 3400 g / t, 3600 g / t, 3800 g / t, 4000 g / t, but is not limited to the listed values. Other unlisted values within this numerical range are equally applicable.

[0026] Preferably, the mass ratio of the pretreatment agent to the pH adjuster in the medicament is 1:(5 - 10). For example, it can be 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, but is not limited to the listed values. Other unlisted values within this numerical range are equally applicable.

[0027] More preferably, it is 1:(6 - 8). For example, it can be 1:6, 1:6.5, 1:7, 1:7.5, 1:8, but it is not limited to the listed values. Other unlisted values within this numerical range are equally applicable.

[0028] In the present invention, the mass ratio of the pretreatment agent to the pH adjuster in the agent is specifically limited to 1:(5 - 10) because within this numerical range, it can exactly prevent the formation of a hydrophilic film on the surface of pyrite. If it is not within the scope defined in the present invention, it will cause the oxidation of the pyrite surface and the improvement of the flotation recovery effect is not obvious. Therefore, further limiting it to 1:(6 - 8) is more conducive to preventing the oxidation of pyrite to form a hydrophilic film under this pH value condition.

[0029] As a preferred technical solution of the present invention, the pH adjuster is any one or a combination of two or more of sodium carbonate, sodium bicarbonate, calcium oxide, sodium hydroxide, sodium sulfide, and sulfuric acid.

[0030] Preferably, the pH adjuster is sodium carbonate.

[0031] It should be noted that in the present invention, using sodium carbonate as the pH adjuster is more conducive to the flotation of pyrite. On the one hand, sodium carbonate can provide an alkaline environment, and on the other hand, it has the function of dispersing the pulp and improving the flotation recovery effect.

[0032] As a preferred technical solution of the present invention, the pretreatment agent is any one or a combination of two or more of sodium citrate, tetrasodium ethylenediaminetetraacetate, isooctyl polyoxyethylene ether phosphate, and tetrasodium glutamate diacetate.

[0033] Preferably, the pretreatment agent is sodium citrate.

[0034] It should be noted that in the present invention, using sodium citrate as the pretreatment agent is more conducive to preventing the oxidation of pyrite to form a hydrophilic film under this pH value condition.

[0035] Preferably, the addition amount of the pretreatment agent is 500 - 1500 g / t. For example, it can be 500 g / t, 600 g / t, 700 g / t, 800 g / t, 900 g / t, 1000 g / t, 1100 g / t, 1200 g / t, 1300 g / t, 1400 g / t, 1500 g / t, but it is not limited to the listed values. Other unlisted values within this numerical range are equally applicable.

[0036] More preferably, it is 1000 - 1300 g / t. For example, it can be 1000 g / t, 1100 g / t, 1200 g / t, 1300 g / t, 1400 g / t, 1500 g / t, but it is not limited to the listed values. Other unlisted values within this numerical range are equally applicable.

[0037] The present invention specifically limits the addition amount of the pretreatment agent to 500-1500 g / t. This is because within this numerical range, it can exactly hinder the formation of a hydrophilic film on the surface of pyrite. If it is not within the limited range of the present invention, it will cause the oxidation of the pyrite surface and the improvement of the flotation recovery effect is not obvious. Therefore, it is further limited to 1000-1300 g / t, which is more conducive to hindering the oxidation of pyrite to form a hydrophilic film under this pH value condition.

[0038] As a preferred technical solution of the present invention, the activator for the activation treatment is any one or a combination of two or more of alkylamines with C10-C40, alkyl salts with C10-C40, oleic acid, and oil salts.

[0039] Preferably, the activator is an alkylamine with C10-C40 or an alkyl salt with C10-C40.

[0040] It should be noted that in the present invention, using an alkylamine with C10-C40 or an alkyl salt with C10-C40 as the activator can be more conducive to eliminating cyanide on the surface of pyrite in the pulp and increasing the surface potential of pyrite.

[0041] Preferably, the addition amount of the activator is 50-3000 g / t. For example, it can be 50 g / t, 100 g / t, 500 g / t, 1000 g / t, 1500 g / t, 2000 g / t, 2500 g / t, 3000 g / t, but it is not limited to the listed values. Other unlisted values within this numerical range are equally applicable.

[0042] More preferably, it is 500-2500 g / t. For example, it can be 500 g / t, 1000 g / t, 1500 g / t, 2000 g / t, 2500 g / t, but it is not limited to the listed values. Other unlisted values within this numerical range are equally applicable.

[0043] The present invention specifically limits the addition amount of the activator to 50-3000 g / t. This is because within this numerical range, the surface potential of pyrite is increased to 195 mV. If it is not within the limited range of the present invention, the potential will be relatively low, affecting the flotation effect. Further limiting it to 500-2500 g / t is more conducive to subsequent flotation separation.

[0044] As a preferred technical solution of the present invention, the cyanide tailings are the cyanide tailings produced by the cyanide gold extraction process.

[0045] Preferably, the cyanide tailings are pyrite cyanide tailings.

[0046] As a preferred technical solution of the present invention, the flotation separation is carried out as follows:

[0047] After the pulp is activated, a flotation agent is added.

[0048] Preferably, the addition amount of the flotation agent is 10 - 500 g / t. For example, it can be 10 g / t, 50 g / t, 100 g / t, 200 g / t, 300 g / t, 400 g / t, 500 g / t, but is not limited to the listed values. Other unlisted values within this numerical range are equally applicable.

[0049] More preferably, it is 100 - 350 g / t. For example, it can be 100 g / t, 150 g / t, 200 g / t, 250 g / t, 300 g / t, 350 g / t, but is not limited to the listed values. Other unlisted values within this numerical range are equally applicable.

[0050] The present invention specifically limits the addition amount of the flotation agent to 10 - 500 g / t because within this numerical range, fine - grained pyrite can fully react with the flotation agent. If it is not within the scope defined by the present invention, it will cause the fine - grained pyrite to have insufficient flotation agent due to its large specific surface area, affecting the flotation effect; or because of excessive flotation agent dosage, it will float fine mud minerals, affecting the flotation effect. Further limiting it to 100 - 350 g / t is more conducive to flotation separation.

[0051] As a preferred technical solution of the present invention, the activation and recovery method specifically includes:

[0052] (1) Adding a reagent to the cyanidation tailings for mixing treatment to obtain pulp;

[0053] (2) Activating the pulp obtained in step (1), and then through flotation separation, cleaning, scavenging, and re - scavenging treatments to obtain pyrite;

[0054] In step (1), before adding the reagent to the cyanidation tailings for mixing treatment, the cyanidation tailings need to be pretreated. The pretreatment is carried out as follows: adjusting the concentration of the cyanidation tailings; the process of adjusting the concentration of the cyanidation tailings is carried out in a stirring device, and the concentration is 10 - 40%;

[0055] The mixing treatment is stirring and mixing. The time of the mixing treatment is 10 - 60 min. The reagent includes a pH adjuster and a pretreatment agent. The pretreatment agent is added to the cyanidation tailings before the pH adjuster. The addition amount of the reagent is 100 - 5000 g / t, and the mass ratio of the pretreatment agent to the pH adjuster in the reagent is 1:(5 - 10);

[0056] The pH regulator is any one or a combination of two or more of sodium carbonate, sodium bicarbonate, calcium oxide, sodium hydroxide, sodium sulfide and sulfuric acid, and the pretreatment agent is any one or a combination of two or more of sodium citrate, tetrasodium ethylenediaminetetraacetate, isooctyl polyoxyethylene ether phosphate, and tetrasodium glutamate diacetate. The addition amount of the pretreatment agent is 500-1500 g / t;

[0057] The activator for the activation treatment is any one or a combination of two or more of C10-C40 alkylamines, C10-C40 alkyl salts, oleic acid and oil salts. The addition amount of the activator is 50-3000 g / t;

[0058] The cyanide tailings are cyanide tailings produced by the cyanide gold extraction process, and the cyanide tailings are pyrite cyanide tailings;

[0059] The flotation separation is carried out as follows: after the pulp is activated, a flotation agent is added; the addition amount of the flotation agent is 10-500 g / t.

[0060] The numerical ranges described in the present invention not only include the point values exemplified above, but also any point values between the above numerical ranges not exemplified. Due to space limitations and for the sake of simplicity, the present invention does not exhaustively list the specific point values included in the ranges.

[0061] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0062] In the present invention, after the cyanide tailings are sequentially subjected to pretreatment, activation treatment and flotation separation treatment, the inhibitory effect on pyrite in the cyanide can be eliminated, and its floatability can be restored to the original state and improved, thereby improving the recovery rate of pyrite. The overall operation process is simple and convenient. Compared with the traditional activation flotation process, the recovery rate is increased by 30%. Specific Embodiments

[0063] The technical solution of the present invention will be further described below through specific embodiments.

[0064] In a specific embodiment, the present invention provides a method for activating and recovering pyrite in cyanide tailings. The activation and recovery method includes:

[0065] (1) Adding a reagent to the cyanide tailings for mixing treatment to obtain a pulp;

[0066] (2) Subjecting the pulp obtained in step (1) to activation treatment, and then through flotation separation, concentration, scavenging and re-scavenging treatments to obtain pyrite; the flotation separation includes roughing, concentration, scavenging and re-scavenging treatments.

[0067] In the present invention, after the cyanidation tailings are sequentially subjected to pretreatment, activation treatment, and flotation separation treatment, the inhibitory effect on pyrite in the cyanidation tailings can be eliminated, its floatability can be restored to the original state and improved, thereby increasing the recovery rate of pyrite. The overall operation process is simple and convenient. Compared with the traditional activation flotation process, the recovery rate is increased by 30%.

[0068] In step (1), before adding the reagent to the cyanidation tailings for mixing treatment, the cyanidation tailings need to be pretreated, and the pretreatment is carried out as follows: adjusting the concentration of the cyanidation tailings.

[0069] The process of adjusting the concentration of the cyanidation tailings is carried out in a stirring device, and the concentration is 10 - 40%, for example, it can be 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, but is not limited to the listed values, and other unlisted values within this numerical range are equally applicable. Further, it is 20 - 30%.

[0070] In step (1), the mixing treatment is stirring and mixing, and the mixing time is 10 - 60 min, for example, it can be 10 min, 20 min, 30 min, 40 min, 50 min, 60 min, but is not limited to the listed values, and other unlisted values within this numerical range are equally applicable. Further, it is 30 - 40 min.

[0071] The reagent includes a pH adjuster and a pretreatment agent, and the pretreatment agent is added to the cyanidation tailings before the pH adjuster. The addition amount of the reagent is 100 - 5000 g / t, for example, it can be 100 g / t, 500 g / t, 1000 g / t, 2000 g / t, 3000 g / t, 4000 g / t, 5000 g / t, but is not limited to the listed values, and other unlisted values within this numerical range are equally applicable. Further, it is 2000 - 4000 g / t.

[0072] The mass ratio of the pretreatment agent to the pH adjuster in the reagent is 1:(5 - 10), for example, it can be 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, but is not limited to the listed values, and other unlisted values within this numerical range are equally applicable. Further, it is 1:(6 - 8).

[0073] The pH adjuster is any one or a combination of two or more of sodium carbonate, sodium bicarbonate, calcium oxide, sodium hydroxide, sodium sulfide, and sulfuric acid. Further, the pH adjuster is sodium carbonate.

[0074] The pretreatment agent is any one or a combination of two or more of sodium citrate, tetrasodium ethylenediaminetetraacetate, isooctyl polyoxyethylene ether phosphate, and tetrasodium glutamate diacetate. Further, the pretreatment agent is sodium citrate.

[0075] The addition amount of the pretreatment agent is 500 - 1500 g / t. For example, it can be 500 g / t, 600 g / t, 700 g / t, 800 g / t, 900 g / t, 1000 g / t, 1100 g / t, 1200 g / t, 1300 g / t, 1400 g / t, 1500 g / t, but is not limited to the listed values. Other unlisted values within this range are equally applicable. Further, it is 1000 - 1300 g / t.

[0076] The activator for the activation treatment is any one or a combination of two or more of C10 - C40 alkylamines, C10 - C40 alkyl salts, oleic acid, and oil salts. Further, the activator is a C10 - C40 alkylamine or a C10 - C40 alkyl salt.

[0077] The addition amount of the activator is 50 - 3000 g / t. For example, it can be 50 g / t, 100 g / t, 500 g / t, 1000 g / t, 1500 g / t, 2000 g / t, 2500 g / t, 3000 g / t, but is not limited to the listed values. Other unlisted values within this range are equally applicable. Further, it is 500 - 2500 g / t.

[0078] The cyanide tailings are the cyanide tailings produced by the cyanide gold extraction process. Further, the cyanide tailings are pyrite cyanide tailings.

[0079] The flotation separation is carried out as follows: After the pulp is activated, a flotation agent is added. The addition amount of the flotation agent is 10 - 500 g / t. For example, it can be 10 g / t, 50 g / t, 100 g / t, 200 g / t, 300 g / t, 400 g / t, 500 g / t, but is not limited to the listed values. Other unlisted values within this range are equally applicable. Further, it is 100 - 350 g / t.

[0080] Example 1

[0081] This example provides a method for activating and recovering pyrite in cyanide tailings, specifically as follows:

[0082] (1) Add a reagent to the cyanide tailings for mixing treatment to obtain pulp;

[0083] (2) Activate the pulp obtained in step (1), and then through flotation separation, concentration, scavenging, and re - scavenging treatments, pyrite is obtained; The flotation separation includes roughing, concentration, scavenging, and re - scavenging treatments;

[0084] In step (1), before adding reagents to the cyanide tailings for mixing treatment, the cyanide tailings need to be pretreated, and the pretreatment is carried out as follows: adjust the concentration of the cyanide tailings; the process of adjusting the concentration of the cyanide tailings is carried out in a stirring device, and the concentration is 10%.

[0085] The mixing treatment is stirring mixing, the mixing treatment time is 10 min, the reagents include a pH adjuster and a pretreatment agent, the pretreatment agent is added to the cyanide tailings before the pH adjuster, the addition amount of the reagents is 100 g / t, and the mass ratio of the pretreatment agent to the pH adjuster in the reagents is 1:10.

[0086] The pH adjuster is sodium carbonate, the pretreatment agent is sodium citrate, and the addition amount of the pretreatment agent is 500 g / t.

[0087] The activator for the activation treatment is alkylamine with C12, and the addition amount of the activator is 2000 g / t.

[0088] The cyanide tailings are cyanide tailings produced by the cyanide gold extraction process, and the cyanide tailings are pyrite cyanide tailings.

[0089] The flotation separation is carried out as follows: after the pulp is activated, a flotation agent is added; the addition amount of the flotation agent is 10 g / t.

[0090] Example 2

[0091] This example provides a method for activating and recovering pyrite in cyanide tailings, specifically as follows:

[0092] (1) Add reagents to the cyanide tailings for mixing treatment to obtain pulp;

[0093] (2) Activate the pulp obtained in step (1), and then through flotation separation, concentration, scavenging, and re-scavenging treatments, pyrite is obtained; the flotation separation includes roughing, concentration, scavenging, and re-scavenging treatments;

[0094] In step (1), before adding reagents to the cyanide tailings for mixing treatment, the cyanide tailings need to be pretreated, and the pretreatment is carried out as follows: adjust the concentration of the cyanide tailings; the process of adjusting the concentration of the cyanide tailings is carried out in a stirring device, and the concentration is 20%.

[0095] The mixing treatment is stirring mixing, the mixing treatment time is 20 min, the reagents include a pH adjuster and a pretreatment agent, the pretreatment agent is added to the cyanide tailings before the pH adjuster, the addition amount of the reagents is 2000 g / t, and the mass ratio of the pretreatment agent to the pH adjuster in the reagents is 1:7.

[0096] The pH adjuster is sodium bicarbonate, the pretreatment agent is tetrasodium ethylenediaminetetraacetate, and the addition amount of the pretreatment agent is 700 g / t;

[0097] The activator for the activation treatment is an alkyl salt of C22, and the addition amount of the activator is 50 g / t;

[0098] The cyanide tailings are the cyanide tailings produced by the cyanidation gold extraction process, and the cyanide tailings are pyrite cyanide tailings;

[0099] The flotation separation is carried out as follows: after the pulp is activated, a flotation agent is added; the addition amount of the flotation agent is 100 g / t.

[0100] Example 3

[0101] This example provides a method for activating and recovering pyrite in cyanide tailings, specifically:

[0102] (1) Add agents to the cyanide tailings for mixing treatment to obtain pulp;

[0103] (2) Activate the pulp obtained in step (1), and then through flotation separation, concentration, scavenging and re-scavenging treatments, pyrite is obtained; the flotation separation includes roughing, concentration, scavenging and re-scavenging treatments;

[0104] In step (1), before adding agents to the cyanide tailings for mixing treatment, the cyanide tailings need to be pretreated, and the pretreatment is carried out as follows: adjust the concentration of the cyanide tailings; the process of adjusting the concentration of the cyanide tailings is carried out in a stirring device, and the concentration is 40%;

[0105] The mixing treatment is stirring and mixing, and the mixing time is 60 min. The agents include a pH adjuster and a pretreatment agent. The pretreatment agent is added to the cyanide tailings before the pH adjuster. The addition amount of the agents is 5000 g / t, and the mass ratio of the pretreatment agent to the pH adjuster in the agents is 1:5;

[0106] The pH adjuster is any one or a combination of two or more of sodium carbonate, sodium bicarbonate, calcium oxide, sodium hydroxide, sodium sulfide and sulfuric acid, and the pretreatment agent is any one or a combination of two or more of sodium citrate, tetrasodium ethylenediaminetetraacetate, isooctyl polyoxyethylene ether phosphate, and glutamate diacetic acid tetrasodium. The addition amount of the pretreatment agent is 1500 g / t;

[0107] The activator for the activation treatment is oleic acid, and the addition amount of the activator is 3000 g / t;

[0108] The cyanide tailings are the cyanide tailings produced by the cyanidation gold extraction process, and the cyanide tailings are pyrite cyanide tailings;

[0109] The flotation separation is carried out as follows: after the pulp is activated, a flotation agent is added; the addition amount of the flotation agent is 500 g / t.

[0110] Example 4

[0111] This example provides a method for activating and recovering pyrite in cyanidation tailings. Compared with Example 1, the difference is that the mixing treatment time is 8 min, and other parameters and operation methods are the same as those in Example 1.

[0112] Example 5

[0113] This example provides a method for activating and recovering pyrite in cyanidation tailings. Compared with Example 1, the difference is that the mixing treatment time is 70 min, and other parameters and operation methods are the same as those in Example 1.

[0114] Example 6

[0115] This example provides a method for activating and recovering pyrite in cyanidation tailings. Compared with Example 1, the difference is that the pretreatment agent and the pH adjuster are added to the cyanidation tailings together, and other parameters and operation methods are the same as those in Example 1.

[0116] Example 7

[0117] This example provides a method for activating and recovering pyrite in cyanidation tailings. Compared with Example 1, the difference is that the pH adjuster is added to the cyanidation tailings before the pretreatment agent, and other parameters and operation methods are the same as those in Example 1.

[0118] Example 8

[0119] This example provides a method for activating and recovering pyrite in cyanidation tailings. Compared with Example 1, the difference is that the mass ratio of the pretreatment agent to the pH adjuster is 1:4, and other parameters and operation methods are the same as those in Example 1.

[0120] Example 9

[0121] This example provides a method for activating and recovering pyrite in cyanidation tailings. Compared with Example 1, the difference is that the mass ratio of the pretreatment agent to the pH adjuster is 1:11, and other parameters and operation methods are the same as those in Example 1.

[0122] Example 10

[0123] This example provides a method for activating and recovering pyrite in cyanidation tailings. Compared with Example 1, the difference is that the addition amount of the pretreatment agent is 450 g / t, and other parameters and operation methods are the same as those in Example 1.

[0124] Example 11

[0125] This embodiment provides a method for activating and recovering pyrite in cyanidation tailings. Compared with Example 1, the difference is that the addition amount of the pretreatment agent is 1550 g / t, and other parameters and operation methods are the same as those in Example 1.

[0126] Example 12

[0127] This embodiment provides a method for activating and recovering pyrite in cyanidation tailings. Compared with Example 1, the difference is that the addition amount of the activator is 45 g / t, and other parameters and operation methods are the same as those in Example 1.

[0128] Example 13

[0129] This embodiment provides a method for activating and recovering pyrite in cyanidation tailings. Compared with Example 1, the difference is that the addition amount of the activator is 3100 g / t, and other parameters and operation methods are the same as those in Example 1.

[0130] Example 14

[0131] This embodiment provides a method for activating and recovering pyrite in cyanidation tailings. Compared with Example 1, the difference is that the addition amount of the flotation agent is 8 g / t, and other parameters and operation methods are the same as those in Example 1.

[0132] Example 15

[0133] This embodiment provides a method for activating and recovering pyrite in cyanidation tailings. Compared with Example 1, the difference is that the addition amount of the flotation agent is 510 g / t, and other parameters and operation methods are the same as those in Example 1.

[0134] Comparative Example 1

[0135] This comparative example provides a method for recovering pyrite in cyanidation tailings. Compared with Example 1, the difference is that there is no activation treatment step, and other parameters and operation methods are the same as those in Example 1.

[0136] Comparative Example 2

[0137] This comparative example provides a method for activating and recovering pyrite in cyanidation tailings. Compared with Example 1, the difference is that there is no cleaning treatment step, and other parameters and operation methods are the same as those in Example 1.

[0138] Comparative Example 3

[0139] This comparative example provides a method for activating and recovering pyrite in cyanidation tailings. Compared with Example 1, the difference is that there is no step of secondary scavenging including scavenging and re-scavenging, and other parameters and operation methods are the same as those in Example 1.

[0140] Calculate the recovery rate of pyrite in the above-mentioned examples and comparative examples. The specific calculation process is that the recovery rate of pyrite concentrate = concentrate grade * concentrate yield / raw ore grade, and summarize the recovery rate. The results are shown in Table 1 below:

[0141] Table 1 Recovery rates of pyrite in examples and comparative examples

[0142] Examples and Comparative Examples Recovery rate of pyrite (%) Example 1 90 Example 2 91 Example 3 92 Example 4 81 Example 5 85 Example 6 76 Example 7 72 Example 8 78 Example 9 81 Example 10 83 Example 11 77 Example 12 84 Example 13 79 Example 14 80 Example 15 87 Comparative Example 1 61 Comparative Example 2 62 Comparative Example 3 58

[0143] As can be seen from Table 1 above:

[0144] By comparing Example 1 with Examples 4 and 5, the recovery rate of pyrite in Example 1 is higher than that in Examples 4 and 5. This is because the mixing treatment time is limited to 10 - 60 min, allowing the pretreatment agent to fully react with cyanide.

[0145] By comparing Example 1 with Examples 6 and 7, the recovery rate of pyrite in Example 1 is higher than that in Examples 6 and 7. This is because adding the pretreatment agent to the cyanide tailings before the pH adjuster hinders the formation of a hydrophilic film on the surface of pyrite and reduces its floatability.

[0146] By comparing Example 1 with Examples 8 and 9, the recovery rate of pyrite in Example 1 is higher than that in Examples 8 and 9. This is because limiting the mass ratio of the pretreatment agent to the pH adjuster in the reagent to 1:(5 - 10) hinders the formation of a hydrophilic film on the surface of pyrite under this pH value condition.

[0147] By comparing Example 1 with Examples 10 and 11, the recovery rate of pyrite in Example 1 is higher than that in Examples 10 and 11. This is because limiting the addition amount of the pretreatment agent to 500 - 1500 g / t hinders the formation of a hydrophilic film on the surface of pyrite under this pH value condition.

[0148] By comparing Example 1 with Examples 12 and 13, the recovery rate of pyrite in Example 1 is higher than that in Examples 12 and 13. This is because limiting the addition amount of the activator to 50 - 3000 g / t eliminates the cyanide on the surface of pyrite in the pulp and increases the surface potential of pyrite.

[0149] By comparing Example 1 with Examples 14 and 15, the recovery rate of pyrite in Example 1 is higher than that in Examples 14 and 15. This is because limiting the addition amount of the flotation agent to 10 - 500 g / t keeps the flotation agent within a reasonable range.

[0150] Compared with Comparative Examples 1-3, the recovery rate of pyrite in Example 1 is higher than that in Comparative Examples 1-3. This is because the specific operation steps for activating and recovering pyrite are defined, eliminating the inhibition of pyrite by cyanide, hindering the oxidation of the pyrite surface, increasing the surface potential of pyrite, and restoring its floatability.

[0151] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

[0152] The present invention uses the above embodiments to illustrate the detailed method of the present invention, but the present invention is not limited to the above detailed method, that is, it does not mean that the present invention must rely on the above detailed method to be implemented. Those skilled in the art should understand that any improvement to the present invention, equivalent replacement of each raw material of the products of the present invention, addition of auxiliary components, selection of specific methods, etc. all fall within the protection scope and the disclosure scope of the present invention.

Claims

1. A method for activating and recovering pyrite in cyanidation tailings, characterized in that, The activation and recovery method includes: (1) Adding reagents to the cyanidation tailings for mixing treatment to obtain pulp; (2) Activating the pulp obtained in step (1), and then performing flotation separation treatment to obtain pyrite; The flotation separation includes roughing, cleaning, scavenging and re-scavenging treatments; The reagents include a pH adjuster and a pretreatment agent; The pretreatment agent is added to the cyanidation tailings before the pH adjuster; The mass ratio of the pretreatment agent to the pH adjuster in the reagents is 1:(5 - 10); The pretreatment agent is any one or a combination of two or more of sodium citrate, tetrasodium ethylenediaminetetraacetate, isooctyl polyoxyethylene ether phosphate, and tetrasodium glutamate diacetate; The activator for the activation treatment is any one or a combination of two or more of C10 - C40 alkylamines, C10 - C40 alkyl salts, oleic acid, and oil salts.

2. The activation and recovery method according to claim 1, characterized in that, In step (1), before adding reagents to the cyanidation tailings for mixing treatment, the cyanidation tailings need to be pretreated, and the pretreatment is carried out as follows: adjusting the concentration of the cyanidation tailings.

3. The activation and recovery method according to claim 2, wherein The process of adjusting the concentration of the cyanidation tailings is carried out in a stirring device.

4. The activation and recovery method according to claim 2, characterized in that, The concentration is 10 - 40%.

5. The activation and recovery method according to claim 4, characterized in that, The concentration is 20 - 30%.

6. The activation and recovery method according to claim 1, wherein In step (1), the mixing treatment is stirring and mixing.

7. The activation and recovery method according to claim 1, wherein The time of the mixing treatment is 10 - 60 min.

8. The activation and recovery method according to claim 7, wherein The time of the mixing treatment is 30 - 40 min.

9. The activation and recovery method according to claim 1, wherein The addition amount of the reagents is 100 - 5000 g / t.

10. The activation and recovery method according to claim 9, characterized in that, The addition amount of the reagents is 2000 - 4000 g / t.

11. The activation and recovery method according to claim 1, characterized in that, The mass ratio of the pretreatment agent to the pH adjuster in the reagents is 1:(6 - 8).

12. The activation and recovery method according to claim 1, wherein The pH adjuster is any one or a combination of two or more of sodium carbonate, sodium bicarbonate, calcium oxide, sodium hydroxide, sodium sulfide, and sulfuric acid.

13. The activation and recovery method according to claim 12, characterized in that, The pH adjuster is sodium carbonate.

14. The activation and recovery method according to claim 1, characterized in that, The pretreatment agent is sodium citrate.

15. The activation and recovery method according to claim 1, wherein The addition amount of the pretreatment agent is 500 - 1500 g / t.

16. The activation and recovery method according to claim 15, wherein, The addition amount of the pretreatment agent is 1000 - 1300 g / t.

17. The activation and recovery method according to claim 1, characterized in that, The activator is a C10 - C40 alkylamine or a C10 - C40 alkyl salt.

18. The activation and recovery method according to claim 1, wherein The addition amount of the activator is 50 - 3000 g / t.

19. The activation and recovery method according to claim 18, characterized in that, The addition amount of the activator is 500 - 2500 g / t.

20. The activation and recovery method according to claim 1, characterized in that, The cyanidation tailings are the cyanidation tailings produced by the cyanidation gold extraction process.

21. The activation and recovery method according to claim 1, wherein The cyanidation tailings are pyrite cyanidation tailings.

22. The activation and recovery method according to claim 1, characterized in that, The flotation separation is carried out as follows: after the pulp is activated, a flotation agent is added.

23. The activation and recovery method according to claim 22, wherein, The addition amount of the flotation agent is 10 - 500 g / t.

24. The activation and recovery method according to claim 23, characterized in that, The addition amount of the flotation agent is 100 - 350 g / t.

25. The activation and recovery method according to claim 1, wherein The activation and recovery method specifically includes: (1) Adding reagents to the cyanidation tailings for mixing treatment to obtain pulp; (2) Activating the pulp obtained in step (1), and then performing flotation separation treatment to obtain pyrite; The flotation separation includes roughing, cleaning, scavenging and re-scavenging treatments; In step (1), before adding reagents to the cyanidation tailings for mixing treatment, the cyanidation tailings need to be pretreated, and the pretreatment is carried out as follows: adjusting the concentration of the cyanidation tailings; the process of adjusting the concentration of the cyanidation tailings is carried out in a stirring device, and the concentration is 10-40%; The mixing treatment is stirring and mixing, the time of the mixing treatment is 10-60 min, the reagents include a pH adjuster and a pretreatment agent, the pretreatment agent is added to the cyanidation tailings before the pH adjuster, the addition amount of the reagents is 100-5000 g / t, and the mass ratio of the pretreatment agent to the pH adjuster in the reagents is 1:(5-10); The pH adjuster is any one or a combination of two or more of sodium carbonate, sodium bicarbonate, calcium oxide, sodium hydroxide, sodium sulfide and sulfuric acid, and the pretreatment agent is any one or a combination of two or more of sodium citrate, sodium ethylenediaminetetraacetate, isooctyl polyoxyethylene ether phosphate, and sodium glutamate diacetate, and the addition amount of the pretreatment agent is 500-1500 g / t; The activator for the activation treatment is any one or a combination of two or more of C10-C40 alkylamines, C10-C40 alkyl salts, oleic acid and oil salts, and the addition amount of the activator is 50-3000 g / t; The cyanidation tailings are cyanidation tailings produced by the cyanidation gold extraction process, and the cyanidation tailings are pyrite cyanidation tailings; The flotation separation is carried out as follows: after the pulp is activated, a flotation agent is added; the addition amount of the flotation agent is 10-500 g / t.