High-recovery-rate and high-grade sulfur concentrate production process

Abstract

The invention discloses a high-recovery-rate and high-grade sulfur concentrate production process. The invention discloses a high-recovery-rate and high-grade sulfur concentrate production process. The process comprises the following steps: S1, crushing raw ore to 200 meshes or below; s2, water is added into the crushed ore for pulp mixing, the pH value of ore pulp is adjusted, and soaking and stirring are conducted; s3, firstly adding an inhibitor and a regulator into the stirred ore pulp, uniformly stirring, then adding concentrated sulfuric acid, xanthate and 2 # oil, carrying out primary roughing to obtain roughing concentrate I and roughing middling I, adding xanthate into the roughing middling I, carrying out secondary roughing to obtain roughing concentrate I and roughing tailings, and carrying out secondary roughing to obtain roughing concentrate II and roughing tailings; the roughing concentrate I and the roughing concentrate I are combined for multiple times of concentration to obtain sulfur concentrate, concentrated sulfuric acid, xanthate and 2 # oil are added into roughing tailings for first scavenging to obtain scavenged tailings I and scavenged middlings I, the scavenged middlings I are subjected to second scavenging to obtain scavenged tailings I, and the scavenged tailings I are tailing mortar. The high-quality sulfur concentrate with the grade reaching 48% or above is obtained through the sulfur concentrate production technology.

Description

Technical Field

[0001] The invention relates to the technical field of ore dressing, and in particular to a production process of high-recovery and high-grade sulfur concentrate. Background Art

[0002] Sulfur concentrate is an important chemical mineral raw material, mainly used to make sulfuric acid, and partly used as chemical raw materials to produce sulfur and various sulfur-containing products. It has important uses in rubber, papermaking, textile, food, match and other industries, especially in the national defense industry to make various explosives, smoke agents, etc. Sulfur concentrate is used as a raw material to make sulfuric acid, and its slag can be used for iron and steel making. If the slag has a high sulfur content and a low iron content, it can be used as an auxiliary raw material for cement - a mixture. At present, the production process of sulfur concentrate still has problems such as high production cost and fluctuations in tailings grade control, sometimes even exceeding 5%. Summary of the invention

[0003] The purpose of the present invention is to provide a high-recovery, high-grade sulfur concentrate production process. The sulfur concentrate production process proposed by the present invention obtains high-quality sulfur concentrate with a grade of more than 48%, reduces the tailings content to less than 3%, achieves a recovery rate of more than 90%, and reduces the risk of pollution discharge.

[0004] The present invention is achieved through the following technical solutions:

[0005] A high-recovery, high-grade sulfur concentrate production process comprises the following steps:

[0006] S1. Crushing the raw ore to less than 200 mesh;

[0007] S2. Add water to the crushed ore to adjust the ore mass concentration to 30% to 45%, adjust the slurry pH to 5 to 6, and fully soak and stir;

[0008] S3. Add inhibitors and regulators to the stirred slurry and stir evenly, then add concentrated sulfuric acid, xanthate and 2# oil for the first roughing to obtain roughing concentrate Ⅰ and roughing ore Ⅰ. Add xanthate to roughing ore Ⅰ for the second roughing to obtain roughing concentrate ⅠⅠ and roughing tailings. Roughing concentrate Ⅰ and roughing concentrate ⅠⅠ are combined for several rounds of selection to obtain sulfur concentrate. Add concentrated sulfuric acid, xanthate and 2# oil to the roughing tailings for the first scavenging to obtain scavenging tailings Ⅰ and scavenging ore Ⅰ. Scavenging ore Ⅰ is scavenged for the second time to obtain scavenging tailings ⅠⅠ, which is tailings mortar.

[0009] The sulfur concentrate production process proposed in the present invention includes an efficient flotation process in the beneficiation stage, a complex associated ore separation technology, a tailings re-selection technology, a difficult-to-select ore flotation technology, a heavy metal pollution control technology, and a beneficiation wastewater xanthate degradation technology, etc., so that the grade of the sulfur concentrate reaches more than 48%, the recovery rate reaches more than 90%, and the tailings content is reduced to less than 3%, reducing the risk of pollution discharge; non-metallic slurry concentration detection device, high recovery rate grinding and classification intelligent control system, fluorescent sulfur element rapid analyzer, online slurry pH detection device improves the automation of beneficiation equipment and improves production efficiency. At the same time, since the amount and type of flotation reagents are controlled in the flotation stage, the treatment cost of mine wastewater can be reduced and the treatment effect can be improved, which has better environmental protection and social benefits than similar products.

[0010] Preferably, the inhibitor in step S3 is sodium hexametaphosphate, and the adjusting agent is H2SO4 (concentrated sulfuric acid).

[0011] More preferably, the dosage of the inhibitor and the regulator in step S3 is 6.0-7.0 Kg / t and 0.01-0.03 Kg / t, respectively. Still more preferably, the dosage of the inhibitor and the regulator is 6.5 Kg / t and 0.02 Kg / t, respectively. In the present invention, Kg / t refers to the mass (Kg) of the inhibitor, regulator, concentrated sulfuric acid, xanthate or 2# oil added per ton of the ore to be treated. Xanthate refers to a sulfide ore collector.

[0012] Preferably, when the grade of the ore is ≤27%±3% (lean ore), the concentrating in step S3 is four times of concentrating, and when the grade of the ore is >27%±3% (rich ore), the concentrating in step S3 is three times of concentrating.

[0013] Further preferably, the specific steps of the four concentrations described in step S3 are: after the rougher concentrate Ⅰ and the rougher concentrate ⅠⅠ are combined, xanthate and 2# oil are added to carry out the first concentration to obtain the concentrated concentrate Ⅰ and the concentrated middlings Ⅰ, the concentrated concentrate Ⅰ is further concentrated for a second time to obtain the concentrated concentrate ⅠⅠ and the concentrated middlings ⅠⅠ, the concentrated concentrate ⅠⅠ is added with xanthate to carry out the third concentration to obtain the concentrated concentrate ⅠⅠⅠ and the concentrated middlings ⅠⅠⅠ, the concentrated middlings ⅠⅠ are combined with the rougher concentrate ⅠⅠ and the rougher concentrate ⅠⅠ to carry out the first concentration, the concentrated concentrate ⅠⅠⅠ is further concentrated for a fourth time to obtain the sulfur concentrate and the concentrated tailings, the grade of the sulfur concentrate is ≥48%, the concentrated middlings ⅠⅠⅠ are mixed with the concentrated concentrate Ⅰ and carried out the second concentration, and the concentrated tailings are mixed with the concentrated concentrate ⅠⅠ to carry out the third concentration.

[0014] After further optimization, the selected middlings I and the scavenged tailings I are combined with the roughing middlings I to carry out the second roughing.

[0015] Further preferably, the specific steps of the three concentrations described in step S3 are: rougher concentrate Ⅰ and rougher concentrate ⅠⅠ are combined, xanthate and 2# oil are added for the first concentration to obtain concentrated concentrate Ⅰ and concentrated middlings Ⅰ, concentrated concentrate Ⅰ is then subjected to a second concentration to obtain concentrated concentrate ⅠⅠ and concentrated middlings ⅠⅠ, concentrated concentrate ⅠⅠ is added with xanthate for the third concentration to obtain sulfur concentrate and concentrated tailings, the grade of the sulfur concentrate is ≥48%, concentrated middlings ⅠⅠ are combined with rougher concentrate Ⅰ and rougher concentrate ⅠⅠ for the first concentration, and the concentrated tailings are mixed with concentrated concentrate Ⅰ for the second concentration.

[0016] In a further preferred embodiment, the amount of xanthate and 2# oil added in the first selection is 0.3-0.5Kg / t, the amount of xanthate added in the third selection is 0.5-0.7Kg / t, and no agent is added in the second and fourth selections. In a further preferred embodiment, the amount of xanthate and 2# oil added in the first selection is 0.4Kg / t, and the amount of xanthate added in the third selection is 0.6Kg / t.

[0017] Still further preferably, the amounts of concentrated sulfuric acid, xanthate and 2# oil added in the first roughing process of step S3 are 0.5-0.7Kg / t, 0.3-0.5Kg / t and 0.06-0.08Kg / t, respectively, the amount of xanthate added in the second roughing process is 0.5-0.7Kg / t, the amounts of concentrated sulfuric acid, xanthate and 2# oil added in the first scavenging process are 0.5-0.7Kg / t, 0.3-0.5Kg / t and 0.04-0.06Kg / t, respectively, and no reagent is added in the second scavenging process. In another preferred step, the amounts of concentrated sulfuric acid, xanthate and 2# oil added in the first roughing process described in step S3 are 0.6Kg / t, 0.4Kg / t and 0.07Kg / t respectively, the amount of xanthate added in the second roughing process is 0.6Kg / t, the amounts of concentrated sulfuric acid, xanthate and 2# oil added in the first scavenging process are 0.6Kg / t, 0.4Kg / t and 0.05Kg / t respectively, and no reagent is added in the second scavenging process.

[0018] Preferably, after the tailings slurry described in step S3 is separated by sedimentation, the solid matter is subjected to the first roughing selection to obtain roughing concentrate I and roughing ore I, the roughing ore I is subjected to the second roughing selection to obtain roughing concentrate ⅠⅠ and tailings, and the grade of the tailings is ≤3%. The roughing concentrate I and the roughing concentrate ⅠⅠ are combined for concentration to obtain concentrated concentrate and concentrated tailings, the concentrated concentrate enters the slurry pool for flotation treatment in step S3, and the concentrated tailings are combined with the solid matter for the first roughing selection.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention explores the influence of different pH values ​​on mineral processing technical indicators and determines a reasonable reagent system; under existing grinding conditions, the pH is adjusted by H2SO4 to activate the properties of the ore pulp and improve the flotation effect.

[0021] 2. According to the existing process parameters, reagent system, experience and methods, the existing process of the flotation system is technically modified to upgrade the flotation production process of the lean ore line from "two roughing, two fines and two sweeping" to "two roughing, four fines and two sweeping"; the flotation production process of the rich ore line from "two roughing, one fine and one sweeping" to "two roughing, three fines and two sweeping"; stably produce high-quality sulfur concentrate with a grade of ≥48% and a theoretical recovery rate of ≥90%.

[0022] 3. The invention adds a tailings desulfurization system, which reduces the tailings content to below 3% through tailings re-selection desulfurization technology, greatly reduces the tailings grade on the original basis, and improves the mineral processing recovery rate.

[0023] 4. The present invention explores the flotation reagent ratio, tests the reagent types, uses a new reagent ethylthiocyanate, reduces the flotation reagent dosage, and changes the flotation reagent system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a process flow chart of Examples 1-3 of the present invention.

[0025] Figure 2 This is a process flow chart of Examples 4-8 of the present invention.

[0026] Figure 3 This is the flotation flow chart of the tailings sulfur reduction system of Example 1-8. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below with reference to the examples. These examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. The experimental methods in the following examples where specific conditions are not specified are generally based on conventional conditions in the art or conditions recommended by the manufacturer; the raw materials, reagents, etc. used, unless otherwise specified, are considered to be raw materials and reagents that can be obtained through commercial channels such as conventional markets.

[0028] Example 1

[0029] Reference Figure 1 and Figure 3 , a high recovery rate, high grade sulfur concentrate production process, comprising the following steps:

[0030] S1. Crushing the raw ore (ore grade is 27%±3%) to less than 200 mesh;

[0031] S2. Add water to the crushed ore to make a slurry to a mass concentration of 40%, use concentrated sulfuric acid to adjust the pH value of the slurry to 5-6, and fully soak and stir;

[0032] S3, first add 6.5Kg / t of sodium hexametaphosphate and 0.02Kg / t of concentrated sulfuric acid (the amount of sodium hexametaphosphate or concentrated sulfuric acid added is based on the mass of the slurry) to the stirred slurry, stir evenly, then add concentrated sulfuric acid, xanthate and 2# oil for the first roughing, the amount of concentrated sulfuric acid, xanthate and 2# oil used is 0.6Kg / t, 0.4Kg / t, 0.07Kg / t (the amount of concentrated sulfuric acid, xanthate and 2# oil added is based on the mass of the slurry), to obtain roughing concentrate Ⅰ and roughing ore Ⅰ, add 0.6Kg / t of xanthate to the roughing ore Ⅰ for the second roughing to obtain roughing concentrate ⅠⅠ and roughing tailings, after the roughing concentrate Ⅰ and the roughing concentrate ⅠⅠ are combined, 0.4Kg / t of xanthate and 0.4Kg / t of 2# oil are added for the first concentrating to obtain concentrating concentrate Ⅰ and concentrating middling Ⅰ, the concentrating concentrate Ⅰ is further concentrating for the second time to obtain Selected concentrate ⅠⅠ and selected middlings ⅠⅠ, 0.6 kg / t of xanthate is added to the selected concentrate ⅠⅠ for the third selection to obtain selected concentrate ⅠⅠⅠ and selected middlings ⅠⅠⅠ, the selected middlings ⅠⅠ are combined with the rougher concentrate Ⅰ and the rougher concentrate ⅠⅠ for the first selection, the selected concentrate ⅠⅠⅠ is further selected for the fourth time to obtain sulfur concentrate and selected tailings, the grade of the sulfur concentrate is 40%, and the recovery rate is 85%, the selected middlings ⅠⅠⅠ are mixed with the selected concentrate Ⅰ for the second selection, the selected tailings are mixed with the selected concentrate ⅠⅠ for the third selection, the rougher tailings are added with concentrated sulfuric acid, xanthate and 2# oil for the first scavenging to obtain scavenged tailings Ⅰ and scavenged middlings Ⅰ, the amounts of concentrated sulfuric acid, xanthate and 2# oil are 0.6 kg / t, 0.4 kg / t and 0.05 kg / t respectively, the scavenged middlings Ⅰ are further scavenged for the second time to obtain scavenged tailings ⅠⅠ, which is the tailings mortar. The selected middlings Ⅰ and scavenged tailings Ⅰ are combined with the roughing middlings Ⅰ for the second roughing.

[0033] The solid matter is subjected to the first roughing to obtain roughing concentrate I and roughing ore Ⅰ, the roughing ore Ⅰ is subjected to the second roughing to obtain roughing concentrate ⅠⅠ and tailings, the grade of the tailings is ≤3%, the roughing concentrate I and the roughing concentrate ⅠⅠ are combined for concentrating to obtain concentrating concentrate and concentrating tailings, the concentrating concentrate enters the slurry pool for flotation treatment in step S3, and the concentrating tailings are combined with the solid matter for the first roughing.

[0034] Example 2

[0035] The same as Example 1, except that the dosage of the inhibitor and the regulator is 6.0Kg / t and 0.01Kg / t respectively, the dosage of the xanthate and 2# oil added in the first fine selection is 0.3Kg / t, and the dosage of the xanthate added in the third fine selection is 0.5Kg / t. The dosage of the concentrated sulfuric acid, xanthate and 2# oil added in the first rough selection is 0.5Kg / t, 0.3Kg / t, 0.06Kg / t respectively, the dosage of the xanthate added in the second rough selection is 0.5Kg / t, and the dosage of the concentrated sulfuric acid, xanthate and 2# oil added in the first scavenging selection is 0.5Kg / t, 0.3Kg / t, 0.04Kg / t respectively. The recovery rate is 85%, and the grade of the sulfur concentrate is 46.73%.

[0036] Example 3

[0037] The same as Example 1, except that the dosage of the inhibitor and the regulator is 7.0Kg / t and 0.03Kg / t respectively, the dosage of the xanthate and 2# oil added in the first fine selection is 0.5Kg / t, and the dosage of the xanthate added in the third fine selection is 0.7Kg / t. The dosage of the concentrated sulfuric acid, xanthate and 2# oil added in the first rough selection is 0.7Kg / t, 0.5Kg / t, 0.08Kg / t respectively, the dosage of the xanthate added in the second rough selection is 0.7Kg / t, and the dosage of the concentrated sulfuric acid, xanthate and 2# oil added in the first scavenging selection is 0.7Kg / t, 0.5Kg / t, 0.06Kg / t respectively. The recovery rate is 88%, and the grade of the sulfur concentrate is 47.73%.

[0038] Example 4

[0039] Reference Figure 2 and Figure 3 , a high recovery rate, high grade sulfur concentrate production process, comprising the following steps:

[0040] S1. Crushing the raw ore (ore grade is 31.5%±3%) to less than 200 mesh;

[0041] S2. Add water to the crushed ore to adjust the ore mass concentration to 32%, use concentrated sulfuric acid to adjust the slurry pH to 5-6, and fully soak and stir;

[0042] S3, after stirring, add 6.5Kg / t of sodium hexametaphosphate and 0.02Kg / t of concentrated sulfuric acid (the amount of sodium hexametaphosphate or concentrated sulfuric acid added is based on the mass of the slurry), stir evenly, then add concentrated sulfuric acid, xanthate and 2# oil for the first roughing, the amount of concentrated sulfuric acid, xanthate and 2# oil used is 0.6Kg / t, 0.4Kg / t and 0.07Kg / t respectively (the amount of concentrated sulfuric acid, xanthate and 2# oil added is based on the mass of the slurry), to obtain roughing concentrate I and roughing ore Ⅰ, add 0.6Kg / t of xanthate to the roughing ore Ⅰ for the second roughing to obtain roughing concentrate ⅠⅠ and roughing tailings, combine the roughing concentrate Ⅰ and the roughing concentrate ⅠⅠ and add 0.4Kg / t of xanthate to obtain roughing concentrate ⅠⅠ and roughing tailings, t xanthate and 0.4 kg / t 2# oil were used for the first concentration to obtain concentrated concentrate Ⅰ and concentrated middlings Ⅰ. The concentrated concentrate Ⅰ was then subjected to the second concentration to obtain concentrated concentrate ⅠⅠ and concentrated middlings ⅠⅠ. The concentrated concentrate ⅠⅠ was added with xanthate for the third concentration to obtain sulfur concentrate and concentrated tailings. The grade of sulfur concentrate was 48.12% and the recovery rate was 90%. The concentrated middlings ⅠⅠ were combined with the rougher concentrate Ⅰ and the rougher concentrate ⅠⅠ for the first concentration. The concentrated tailings were mixed with the concentrated concentrate Ⅰ and then subjected to the second concentration. The rougher tailings were added with concentrated sulfuric acid, xanthate and 2# oil for the first scavenging to obtain scavenging tailings Ⅰ and scavenging middlings Ⅰ. The scavenging middlings Ⅰ were subjected to the second scavenging to obtain scavenging tailings ⅠⅠ, which was tailings slurry. The concentrated middlings Ⅰ and scavenging tailings Ⅰ were then combined with the rougher middlings Ⅰ for the second roughing.

[0043] The solid matter is subjected to the first roughing to obtain roughing concentrate I and roughing ore Ⅰ, the roughing ore Ⅰ is subjected to the second roughing to obtain roughing concentrate ⅠⅠ and tailings, the grade of the tailings is ≤3%, the roughing concentrate I and the roughing concentrate ⅠⅠ are combined for concentrating to obtain concentrating concentrate and concentrating tailings, the concentrating concentrate enters the slurry pool for flotation treatment in step S3, and the concentrating tailings are combined with the solid matter for the first roughing.

[0044] Example 5

[0045] Same as Example 4, except that the dosage of inhibitor and adjuster is 6.0Kg / t and 0.01Kg / t respectively, the dosage of xanthate and 2# oil added in the first fine selection is 0.3Kg / t, and the dosage of xanthate added in the third fine selection is 0.5Kg / t. The dosage of concentrated sulfuric acid, xanthate and 2# oil added in the first rough selection is 0.5Kg / t, 0.3Kg / t, 0.06Kg / t respectively, the dosage of xanthate added in the second rough selection is 0.5Kg / t, and the dosage of concentrated sulfuric acid, xanthate and 2# oil added in the first scavenging selection is 0.5Kg / t, 0.3Kg / t, 0.04Kg / t respectively. The recovery rate is 76%, and the grade of sulfur concentrate is 47.97%.

[0046] Example 6

[0047] Same as Example 4, except that the dosage of inhibitor and adjuster is 7.0Kg / t and 0.03Kg / t respectively, the dosage of xanthate and 2# oil added in the first fine selection is 0.5Kg / t, and the dosage of xanthate added in the third fine selection is 0.7Kg / t. The dosage of concentrated sulfuric acid, xanthate and 2# oil added in the first rough selection is 0.7Kg / t, 0.5Kg / t, 0.08Kg / t respectively, the dosage of xanthate added in the second rough selection is 0.7Kg / t, and the dosage of concentrated sulfuric acid, xanthate and 2# oil added in the first scavenging selection is 0.7Kg / t, 0.5Kg / t, 0.06Kg / t respectively. The recovery rate is 86%, and the grade of sulfur concentrate is 47.66%.

[0048] Example 7

[0049] Same as Example 4, except that: the pulp concentration is 35%, the dosage of the inhibitor and the regulator are 6.0Kg / t and 0.01Kg / t respectively, the dosage of the xanthate and 2# oil added in the first fine selection is 0.3Kg / t, and the dosage of the xanthate added in the third fine selection is 0.5Kg / t. The dosage of the concentrated sulfuric acid, xanthate and 2# oil added in the first rough selection is 0.5Kg / t, 0.3Kg / t, 0.06Kg / t respectively, the dosage of the xanthate added in the second rough selection is 0.5Kg / t, and the dosage of the concentrated sulfuric acid, xanthate and 2# oil added in the first scavenging selection is 0.5Kg / t, 0.3Kg / t, 0.04Kg / t respectively. The recovery rate is 80%, and the grade of the sulfur concentrate is 47.68%.

[0050] Example 8

[0051] Same as Example 4, except that: the pulp concentration is 42%, the dosage of inhibitor and adjuster is 7.0Kg / t and 0.03Kg / t respectively, the dosage of xanthate and 2# oil added in the first fine selection is 0.5Kg / t, and the dosage of xanthate added in the third fine selection is 0.7Kg / t. The dosage of concentrated sulfuric acid, xanthate and 2# oil added in the first rough selection is 0.7Kg / t, 0.5Kg / t, 0.08Kg / t respectively, the dosage of xanthate added in the second rough selection is 0.7Kg / t, and the dosage of concentrated sulfuric acid, xanthate and 2# oil added in the first scavenging selection is 0.7Kg / t, 0.5Kg / t, 0.06Kg / t respectively. The recovery rate is 83%, and the grade of sulfur concentrate is 47.88%.

[0052] The description of the above embodiments is only used to help understand the technical solution and core ideas of the present invention. It should be pointed out that for technicians in this technical field, several improvements and modifications can be made to the present invention without departing from the principles of the present invention. These improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A high-recovery, high-grade sulfur concentrate production process, characterized in that: The steps include: S1. Crushing the raw ore to less than 200 mesh; S2. Add water to the crushed ore to adjust the ore mass concentration to 30% to 45%, adjust the slurry pH to 5 to 6, and fully soak and stir; S3. Add inhibitors and regulators to the stirred slurry and stir evenly, then add concentrated sulfuric acid, xanthate and 2# oil for the first roughing to obtain roughing concentrate Ⅰ and roughing ore Ⅰ. Add xanthate to roughing ore Ⅰ for the second roughing to obtain roughing concentrate ⅠⅠ and roughing tailings. Roughing concentrate Ⅰ and roughing concentrate ⅠⅠ are combined for several rounds of selection to obtain sulfur concentrate. Add concentrated sulfuric acid, xanthate and 2# oil to the roughing tailings for the first scavenging to obtain scavenging tailings Ⅰ and scavenging ore Ⅰ. Scavenging ore Ⅰ is scavenged for the second time to obtain scavenging tailings ⅠⅠ, which is tailings mortar.

2. The sulfur concentrate production process according to claim 1, characterized in that: The inhibitor in step S3 is sodium hexametaphosphate, and the adjusting agent is H2SO4.

3. The sulfur concentrate production process according to claim 1 or 2, characterized in that: The dosage of the inhibitor and the regulator in step S3 is 6.0-7.0 Kg / t and 0.01-0.03 Kg / t respectively.

4. The sulfur concentrate production process according to claim 1, characterized in that: When the grade of the ore is ≤27%±3%, the concentrating in step S3 is four times of concentrating; when the grade of the ore is >27%±3%, the concentrating in step S3 is three times of concentrating.

5. The sulfur concentrate production process according to claim 4, characterized in that: The specific steps of the four concentrations described in step S3 are: after the rougher concentrate Ⅰ and the rougher concentrate ⅠⅠ are combined, xanthate and 2# oil are added to carry out the first concentration to obtain the concentrated concentrate Ⅰ and the concentrated middling Ⅰ, the concentrated concentrate Ⅰ is further concentrated for the second time to obtain the concentrated concentrate ⅠⅠ and the concentrated middling ⅠⅠ, the concentrated concentrate ⅠⅠ is added with xanthate to carry out the third concentration to obtain the concentrated concentrate ⅠⅠⅠ and the concentrated middling ⅠⅠⅠ, the concentrated middling ⅠⅠ is combined with the rougher concentrate ⅠⅠ and the rougher concentrate ⅠⅠ to carry out the first concentration, the concentrated concentrate ⅠⅠⅠ is further concentrated for the fourth time to obtain the sulfur concentrate and the concentrated tailings, the grade of the sulfur concentrate is ≥48%, the concentrated middling ⅠⅠⅠ is mixed with the concentrated concentrate Ⅰ and carried out the second concentration, and the concentrated tailings are mixed with the concentrated concentrate ⅠⅠ to carry out the third concentration.

6. The sulfur concentrate production process according to claim 5, characterized in that: The selected middlings Ⅰ and scavenged tailings Ⅰ are combined with the roughing middlings Ⅰ for the second roughing.

7. The sulfur concentrate production process according to claim 4, characterized in that: The specific steps of the three concentrations described in step S3 are: rougher concentrate Ⅰ and rougher concentrate ⅠⅠ are combined, xanthate and 2# oil are added to carry out the first concentration to obtain concentrated concentrate Ⅰ and concentrated middlings Ⅰ, the concentrated concentrate Ⅰ is then subjected to a second concentration to obtain concentrated concentrate ⅠⅠ and concentrated middlings ⅠⅠ, xanthate is added to concentrated concentrate ⅠⅠ to carry out a third concentration to obtain sulfur concentrate and concentrated tailings, the grade of the sulfur concentrate is ≥48%, the concentrated middlings ⅠⅠ are combined with the rougher concentrate Ⅰ and the rougher concentrate ⅠⅠ to carry out the first concentration, and the concentrated tailings are mixed with the concentrated concentrate Ⅰ to carry out the second concentration.

8. The sulfur concentrate production process according to claim 5 or 7, characterized in that: The dosage of xanthate and 2# oil added in the first concentration is 0.3-0.5Kg / t, the dosage of xanthate added in the third concentration is 0.5-0.7Kg / t, and no agent is added in the second and fourth concentrations.

9. The sulfur concentrate production process according to claim 1, characterized in that: The amounts of concentrated sulfuric acid, xanthate and 2# oil added in the first roughing process described in step S3 are 0.5-0.7Kg / t, 0.3-0.5Kg / t and 0.06-0.08Kg / t, respectively; the amount of xanthate added in the second roughing process is 0.5-0.7Kg / t; the amounts of concentrated sulfuric acid, xanthate and 2# oil added in the first scavenging process are 0.5-0.7Kg / t, 0.3-0.5Kg / t and 0.04-0.06Kg / t, respectively; and no reagent is added in the second scavenging process.

10. The sulfur concentrate production process according to claim 1, characterized in that: After the tailings slurry described in step S3 is separated by sedimentation, the solid matter is subjected to the first roughing selection to obtain roughing concentrate I and roughing ore Ⅰ, the roughing ore Ⅰ is subjected to the second roughing selection to obtain roughing concentrate ⅠⅠ and tailings, and the grade of the tailings is ≤3%. The roughing concentrate I and the roughing concentrate ⅠⅠ are combined for concentration to obtain concentrated concentrate and concentrated tailings, the concentrated concentrate enters the slurry pool for flotation treatment in step S3, and the concentrated tailings are combined with the solid matter for the first roughing selection.

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