A method for recovering sulfur and cobalt from sulfur- and cobalt-containing vanadium-titanium iron concentrate.

Abstract

This invention relates to the field of mineral processing technology, specifically to a method for recovering sulfur and cobalt from sulfur- and cobalt-containing vanadium-titanium iron concentrate. The method includes the following steps: Step S1, subjecting the sulfur- and cobalt-containing vanadium-titanium iron concentrate to a first grinding process to obtain a slurry, wherein the slurry contains 75-95% particles with a diameter less than 43 μm; Step S2, subjecting the slurry to a sulfur-cobalt mixed flotation process to obtain a sulfur-cobalt concentrate and a desulfurized iron concentrate; Step S3, subjecting the sulfur-cobalt concentrate to a second grinding process to obtain a sulfur-cobalt concentrate slurry, wherein the sulfur-cobalt concentrate slurry contains 65-95% particles with a diameter less than 38 μm; Step S4, subjecting the sulfur-cobalt concentrate slurry to a sulfur-cobalt separation flotation process to obtain a cobalt concentrate and a low-grade sulfur concentrate; Step S5, subjecting the low-grade sulfur concentrate to a sulfur beneficiation process, where sulfur flotation yields a sulfur concentrate and tailings.

Description

Technical Field

[0001] This invention relates to the field of mineral processing technology, and in particular to a method for recovering sulfur and cobalt from sulfur- and cobalt-containing vanadium-titanium iron concentrate. Background Technology

[0002] Vanadium-titanium magnetite is a polymetallic symbiotic mineral containing various beneficial elements such as iron, vanadium, titanium, sulfur, and cobalt. Currently, the beneficiation process of vanadium-titanium magnetite mainly recovers iron, titanium, and vanadium, while sulfur and cobalt are not fully recovered. Sulfur in vanadium-titanium magnetite is mainly found in sulfides such as pyrrhotite, while cobalt is mainly found in sulfides such as nickel-cobalt pyrite and cobalt sulfide. Due to the close symbiosis of sulfide minerals in vanadium-titanium magnetite, these sulfur and cobalt resources tend to accumulate in the vanadium-titanium iron concentrate during beneficiation. Furthermore, the properties of sulfur- and cobalt-containing sulfides are similar, making it difficult to separate them into individual sulfur and cobalt products. To address this technical problem, a method for recovering sulfur and cobalt from sulfur- and cobalt-containing vanadium-titanium iron concentrate is proposed. Summary of the Invention

[0003] In order to solve the technical problems existing in the prior art, the present invention provides a method for recovering sulfur and cobalt from vanadium-titanium iron concentrate containing sulfur and cobalt.

[0004] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0005] In a first aspect, in one embodiment of the present invention, a method for recovering sulfur and cobalt from sulfur- and cobalt-containing vanadium-titanium iron concentrate is provided, the method comprising the following steps:

[0006] Step S1: The vanadium-titanium iron concentrate containing sulfur and cobalt is subjected to a first grinding process to obtain a slurry, wherein the content of particles with a particle size of less than 43 μm in the slurry is 75-95%.

[0007] Step S2: The slurry is processed by a sulfur-cobalt mixed flotation process to obtain sulfur-cobalt concentrate and desulfurized iron concentrate;

[0008] Step S3: The cobalt sulfide concentrate is subjected to a second grinding process to obtain a cobalt sulfide concentrate slurry, wherein the content of particles with a particle size of less than 38 μm in the cobalt sulfide concentrate slurry is 65-95%.

[0009] Step S4: Process the sulfur-cobalt concentrate slurry through a sulfur-cobalt separation flotation process to obtain cobalt concentrate and low-grade sulfur concentrate;

[0010] Step S5: The low-grade sulfur concentrate is processed by sulfur beneficiation process to obtain sulfur concentrate and tailings by sulfur flotation.

[0011] As a further aspect of the present invention, the first grinding process is carried out by a tower mill.

[0012] As a further aspect of the present invention, the sulfur-cobalt mixed flotation process includes a first roughing process I, a first cleaning process I, a first cleaning process II, and a first scavenging process I; wherein, the intermediate tailings output from the first cleaning process I, the first cleaning process II, and the first scavenging process I are returned sequentially.

[0013] As a further aspect of the present invention, the input of the first roughing selection I is ore; one output of the first roughing selection I is sequentially processed through the first cleaning selection I and the first cleaning selection II to obtain cobalt-sulfur concentrate; another output of the first roughing selection I is processed through the first scavenging selection I to obtain desulfurized iron concentrate.

[0014] As a further aspect of the present invention, the equipment used in the sulfur-cobalt mixed flotation process is an aerated mechanical stirring flotation machine.

[0015] As a further aspect of the present invention, the second grinding process utilizes an Isa mill.

[0016] As a further embodiment of the present invention, the sulfur-cobalt separation flotation process includes a second roughing process I, a second cleaning process I, a second cleaning process II, a second cleaning process III, a second scavenging process I, and a second scavenging process II; wherein, the intermediate tailings output from the second cleaning process I, the second cleaning process II, the second cleaning process III, the second scavenging process I, and the second scavenging process II are returned sequentially.

[0017] As a further aspect of the present invention, the input of the second roughing process I is a sulfur-cobalt concentrate slurry, and one output of the second roughing process I is sequentially processed through the second cleaning process I, the second cleaning process II, and the second cleaning process III to obtain cobalt concentrate; the other output of the second roughing process I is sequentially processed through the second scavenging process I and the second scavenging process II to obtain low-grade sulfur concentrate.

[0018] As a further aspect of the present invention, the equipment used in the sulfur-cobalt separation flotation process is a flotation column or a jet flotation column.

[0019] As a further aspect of the present invention, the sulfur beneficiation process includes a third roughing process I, a third beneficiation process I, and a third scavenging process I; wherein, the intermediate tailings output from the third beneficiation process I and the third scavenging process I are returned sequentially.

[0020] The technical solution provided by this invention has the following beneficial effects:

[0021] The present invention provides a method for recovering sulfur and cobalt from sulfur- and cobalt-containing vanadium-titanium iron concentrate, comprising the following steps: S1, subjecting the sulfur- and cobalt-containing vanadium-titanium iron concentrate to a first grinding process to obtain a slurry, wherein the slurry contains 75-95% particles with a diameter less than 43 μm; S2, subjecting the slurry to a sulfur-cobalt mixed flotation process to obtain a sulfur-cobalt concentrate and a desulfurized iron concentrate; S3, subjecting the sulfur-cobalt concentrate to a second grinding process to obtain a sulfur-cobalt concentrate slurry, wherein the sulfur-cobalt concentrate slurry contains 65-95% particles with a diameter less than 38 μm; S4, subjecting the sulfur-cobalt concentrate slurry to a sulfur-cobalt separation flotation process to obtain a cobalt concentrate and a low-grade sulfur concentrate; and S5, subjecting the low-grade sulfur concentrate to a sulfur beneficiation process, wherein sulfur flotation yields a sulfur concentrate and tailings. This invention reduces the sulfur (S) content in cobalt-sulfur vanadium-titanium iron concentrate from 0.6%–0.8% to below 0.2%, improving the quality of the vanadium-titanium iron concentrate and facilitating ultra-low SO2 emissions during the subsequent sintering process. It also enables the recovery and separation of sulfur and cobalt from the vanadium-titanium iron concentrate, yielding separate cobalt and sulfur concentrates. The cobalt concentrate has a Co grade ≥1.0%, and the sulfur concentrate has an S grade ≥31.0%, thus improving the comprehensive utilization rate and value of vanadium-titanium magnetite resources.

[0022] These or other aspects of the invention will become more apparent from the following description of embodiments. It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a flowchart illustrating a method for recovering sulfur and cobalt from sulfur- and cobalt-containing vanadium-titanium iron concentrate according to an embodiment of the present invention. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] The flowchart shown in the attached diagram is for illustrative purposes only and does not necessarily include all content and operations / steps, nor does it necessarily have to be performed in the order described. For example, some operations / steps can be broken down, combined, or partially merged, so the actual execution order may change depending on the actual situation.

[0027] This invention provides a method for recovering sulfur and cobalt from sulfur- and cobalt-containing vanadium-titanium iron concentrate. The method includes the following steps:

[0028] Step S1: The vanadium-titanium iron concentrate containing sulfur and cobalt is subjected to a first grinding process to obtain a slurry, wherein the content of particles with a particle size of less than 43 μm in the slurry is 75-95%.

[0029] The first grinding process can be carried out using a tower mill.

[0030] Step S2: The slurry is processed by a sulfur-cobalt mixed flotation process to obtain sulfur-cobalt concentrate and desulfurized iron concentrate;

[0031] The sulfur-cobalt mixed flotation process includes a first roughing process I, a first cleaning process I, a first cleaning process II, and a first scavenging process I; wherein, the intermediate tailings output from the first cleaning process I, the first cleaning process II, and the first scavenging process I are returned sequentially.

[0032] The input to the first roughing process I is the ore; one output of the first roughing process I is processed sequentially through the first cleaning process I and the first cleaning process II to obtain cobalt-sulfur concentrate; the other output of the first roughing process I is processed through the first scavenging process I to obtain desulfurized iron concentrate.

[0033] The equipment used in the sulfur-cobalt mixed flotation process is an aerated mechanical stirring flotation machine.

[0034] In this embodiment of the invention, in the first roughing stage I of the sulfur-cobalt mixed flotation process:

[0035] Acid is used as a pH adjuster to adjust the pH of the slurry to 4-6.

[0036] The yellow powder was used as the collector, and its dosage was 100-600 g / t;

[0037] #2 oil is a foaming agent, and its dosage is 40-60g / t.

[0038] In this embodiment of the invention, in the first scavenging step I of the sulfur-cobalt mixed flotation process:

[0039] Use sulfuric acid as a pH adjuster to adjust the pH of the slurry to 4-6;

[0040] The yellow powder was used as the collector, and the dosage was 50-250 g / t;

[0041] #2 oil is a foaming agent, and its dosage is 30-60g / t;

[0042] It should be noted that neither the first selection process (I) nor the first selection process (II) in the sulfur-cobalt mixed flotation process contain any additives.

[0043] Step S3: The cobalt sulfide concentrate is subjected to a second grinding process to obtain a cobalt sulfide concentrate slurry, wherein the content of particles with a particle size of less than 38 μm in the cobalt sulfide concentrate slurry is 65-95%.

[0044] The second grinding process can be achieved using an Isa mill.

[0045] Step S4: Process the sulfur-cobalt concentrate slurry through a sulfur-cobalt separation flotation process to obtain cobalt concentrate and low-grade sulfur concentrate;

[0046] The sulfur-cobalt separation flotation process includes a second rougher flotation I, a second cleaner flotation I, a second cleaner flotation II, a second cleaner flotation III, a second scavenger flotation I, and a second scavenger flotation II. The intermediate tailings output from the second cleaner flotation I, second cleaner flotation II, second cleaner flotation III, second scavenger flotation I, and second scavenger flotation II are sequentially returned.

[0047] In this embodiment of the invention, the input of the second roughing process I is a sulfur-cobalt concentrate slurry. One output of the second roughing process I is sequentially processed through the second cleaning process I, the second cleaning process II, and the second cleaning process III to obtain cobalt concentrate. The other output of the second roughing process I is sequentially processed through the second scavenging process I and the second scavenging process II to obtain low-grade sulfur concentrate.

[0048] In this embodiment of the invention, the equipment used in the sulfur-cobalt separation flotation process is a flotation column or a jet flotation column.

[0049] In this embodiment of the invention, in the second roughing stage I of the sulfur-cobalt separation flotation process:

[0050] Lime was used as a pH adjuster to adjust the pH of the slurry to 8–10.

[0051] A mixture of sodium thiosulfate and sodium humate is used as an inhibitor, with a ratio of 20%:80%-60%:40% and a dosage of 20-100 g / t.

[0052] The yellow powder was used as the collector, and the dosage was 20-100 g / t;

[0053] #2 oil is a foaming agent, and its dosage is 0-40 g / t. Specifically, #2 oil is a complex higher alcohol.

[0054] In the second scavenging step of the sulfur-cobalt separation flotation process:

[0055] Lime was used as a pH adjuster to adjust the pH of the slurry to 8–10.

[0056] A mixture of sodium thiosulfate and sodium humate is used as an inhibitor, with a ratio of 20%:8% to 60%:40% and a dosage of 10 to 50 g / t.

[0057] The yellow powder was used as the collector, and the dosage was 10-50 g / t;

[0058] #2 oil is a foaming agent, and its dosage is 0-20g / t.

[0059] In the second scavenging stage II of the sulfur-cobalt separation flotation process:

[0060] Lime was used as a pH adjuster to adjust the pH of the slurry to 8–10.

[0061] A mixture of sodium thiosulfate and sodium humate is used as an inhibitor, with a ratio of 20%:80%-60%:40% and a dosage of 5-25 g / t.

[0062] The yellow powder was used as the collector, and the dosage was 5-25 g / t;

[0063] #2 oil is a foaming agent, and its dosage is 0-20g / t.

[0064] In the second refining stage I of the sulfur-cobalt separation flotation process:

[0065] Lime was used as a pH adjuster to adjust the pH of the slurry to 8–10.

[0066] A mixture of sodium thiosulfate and sodium humate is used as an inhibitor, with a ratio of 20%:80% to 60%:40%, and a dosage of 10 to 50 g / t.

[0067] It should be noted that no reagents were added in the second selection process (II and III) of the sulfur-cobalt separation flotation process.

[0068] Step S5: The low-grade sulfur concentrate is processed by sulfur beneficiation process to obtain sulfur concentrate and tailings by sulfur flotation.

[0069] In this embodiment of the invention, the sulfur beneficiation process includes a third roughing process I, a third beneficiation process I, and a third scavenging process I; wherein, the intermediate tailings output from the third beneficiation process I and the third scavenging process I are returned sequentially.

[0070] In this embodiment of the invention, the input of the third roughing process I is low-grade sulfur concentrate; one output of the third roughing process I is processed through the third cleaning process I to obtain sulfur concentrate; and another output of the third roughing process I is processed through the third scavenging process I to obtain tailings.

[0071] The sulfur beneficiation process uses an aerated mechanical agitation flotation machine.

[0072] In the third coarse selection I of the sulfur refining process:

[0073] Sulfuric acid was used as a pH adjuster to adjust the pH of the slurry to 3–5.

[0074] Copper sulfate is used as the activator, and its dosage is 20-100 g / t;

[0075] #2 oil is a foaming agent, and its dosage is 0-20g / t.

[0076] In the third scavenging step of the sulfur refining process:

[0077] Sulfuric acid was used as a pH adjuster to adjust the pH of the slurry to 3–5.

[0078] Copper sulfate is used as the activator, and its dosage is 15-50 g / t;

[0079] #2 oil is a foaming agent, and its dosage is 0-20g / t.

[0080] It should be noted that no reagents were added in the third cleaning step (I) of the sulfur-cobalt separation flotation process.

[0081] It should be noted that the input for coarse screening is slurry or the tailings output from the next stage of coarse screening; the next stage after coarse screening is fine screening or scavenging.

[0082] It should be noted that the input of the refined product is the concentrate output of the previous level; if the refined product has a next level of refined product, its input also includes the tailings output of the next level of refined product.

[0083] It should be noted that the input of the scavenging process is the tailings output of the previous stage. If the scavenging process has a next stage, its input also includes the tailings output of the next stage.

[0084] Example 1

[0085] A method for recovering sulfur and cobalt from sulfur- and cobalt-containing vanadium-titanium iron concentrate includes the following steps:

[0086] Step S1: The vanadium-titanium iron concentrate containing sulfur and cobalt is subjected to a first grinding process to obtain a slurry, wherein the content of particles with a particle size of less than 43μm in the slurry is 75%.

[0087] The first grinding process can be carried out using a tower mill.

[0088] Step S2: The slurry is processed by a sulfur-cobalt mixed flotation process to obtain sulfur-cobalt concentrate and desulfurized iron concentrate;

[0089] The sulfur-cobalt mixed flotation process includes a first roughing process I, a first cleaning process I, a first cleaning process II, and a first scavenging process I; wherein, the intermediate tailings output from the first cleaning process I, the first cleaning process II, and the first scavenging process I are returned sequentially.

[0090] The input to the first roughing process I is the ore; one output of the first roughing process I is processed sequentially through the first cleaning process I and the first cleaning process II to obtain cobalt-sulfur concentrate; the other output of the first roughing process I is processed through the first scavenging process I to obtain desulfurized iron concentrate.

[0091] The equipment used in the sulfur-cobalt mixed flotation process is an aerated mechanical stirring flotation machine.

[0092] One of the outputs of the first fine-selection II of the sulfur-cobalt mixed flotation process is sulfur-cobalt concentrate; one of the outputs of the first scavenging I of the sulfur-cobalt mixed flotation process is desulfurized iron concentrate.

[0093] In this embodiment of the invention, in the first roughing stage I of the sulfur-cobalt mixed flotation process:

[0094] Acid is used as a pH adjuster to adjust the pH of the slurry to 4.

[0095] Xanthium was used as the collector, and its dosage was 100g / t;

[0096] #2 oil is a foaming agent, and its dosage is 40g / t.

[0097] In this embodiment of the invention, in the first scavenging step I of the sulfur-cobalt mixed flotation process:

[0098] Sulfuric acid was used as a pH adjuster to adjust the pH of the slurry to 4.

[0099] Xanthium was used as the collector, and its dosage was 50g / t;

[0100] #2 oil is a foaming agent, and its dosage is 30g / t;

[0101] It should be noted that neither the first selection process (I) nor the first selection process (II) in the sulfur-cobalt mixed flotation process contain any additives.

[0102] Step S3: The cobalt sulfide concentrate is subjected to a second grinding process to obtain a cobalt sulfide concentrate slurry, wherein the content of particles with a particle size of less than 38 μm in the cobalt sulfide concentrate slurry is 65%.

[0103] The second grinding process can be achieved using an Isa mill.

[0104] Step S4: Process the sulfur-cobalt concentrate slurry through a sulfur-cobalt separation flotation process to obtain cobalt concentrate and low-grade sulfur concentrate;

[0105] The sulfur-cobalt separation flotation process includes a second rougher flotation I, a second cleaner flotation I, a second cleaner flotation II, a second cleaner flotation III, a second scavenger flotation I, and a second scavenger flotation II. The intermediate tailings output from the second cleaner flotation I, second cleaner flotation II, second cleaner flotation III, second scavenger flotation I, and second scavenger flotation II are sequentially returned.

[0106] In this embodiment of the invention, the input of the second roughing process I is a sulfur-cobalt concentrate slurry. One output of the second roughing process I is sequentially processed through the second cleaning process I, the second cleaning process II, and the second cleaning process III to obtain cobalt concentrate. The other output of the second roughing process I is sequentially processed through the second scavenging process I and the second scavenging process II to obtain low-grade sulfur concentrate.

[0107] In this embodiment of the invention, the equipment used in the sulfur-cobalt separation flotation process is a flotation column or a jet flotation column.

[0108] In this embodiment of the invention, in the second roughing stage I of the sulfur-cobalt separation flotation process:

[0109] Lime was used as a pH adjuster to adjust the pH of the slurry to 8.

[0110] A mixture of sodium thiosulfate and sodium humate was used as an inhibitor, with a ratio of 20%:80% and a dosage of 20g / t.

[0111] Xanthium was used as the collector, and its dosage was 20g / t;

[0112] In the second scavenging step of the sulfur-cobalt separation flotation process:

[0113] Lime was used as a pH adjuster to adjust the pH of the slurry to 8.

[0114] A mixture of sodium thiosulfate and sodium humate was used as an inhibitor in a ratio of 20% to 8%, and the dosage was 10 g / t.

[0115] Xanthium was used as the collector, and its dosage was 10g / t;

[0116] In the second scavenging stage II of the sulfur-cobalt separation flotation process:

[0117] Lime was used as a pH adjuster to adjust the pH of the slurry to 8.

[0118] A mixture of sodium thiosulfate and sodium humate was used as an inhibitor, with a ratio of 20%:80%, and a dosage of 5g / t.

[0119] Xanthium was used as the collector, and its dosage was 5g / t;

[0120] #2 oil is a foaming agent, and its dosage is 0g / t.

[0121] In the second refining stage I of the sulfur-cobalt separation flotation process:

[0122] Lime was used as a pH adjuster to adjust the pH of the slurry to 8.

[0123] A mixture of sodium thiosulfate and sodium humate was used as an inhibitor, with a ratio of 20%:80% and a dosage of 10g / t.

[0124] It should be noted that no reagents were added in the second selection process (II and III) of the sulfur-cobalt separation flotation process.

[0125] Step S5: The low-grade sulfur concentrate is processed by sulfur beneficiation process to obtain sulfur concentrate and tailings by sulfur flotation.

[0126] In this embodiment of the invention, the sulfur beneficiation process includes a third roughing process I, a third beneficiation process I, and a third scavenging process I; wherein, the intermediate tailings output from the third beneficiation process I and the third scavenging process I are returned sequentially.

[0127] In this embodiment of the invention, the input of the third roughing process I is low-grade sulfur concentrate; one output of the third roughing process I is processed through the third cleaning process I to obtain sulfur concentrate; and another output of the third roughing process I is processed through the third scavenging process I to obtain tailings.

[0128] The sulfur beneficiation process uses an aerated mechanical agitation flotation machine.

[0129] In the third coarse selection I of the sulfur refining process:

[0130] Sulfuric acid was used as a pH adjuster to adjust the pH of the slurry to 3.

[0131] Copper sulfate was used as the activator, and its dosage was 20g / t;

[0132] #2 oil is a foaming agent, and its dosage is 0g / t.

[0133] In the third scavenging step of the sulfur refining process:

[0134] Sulfuric acid was used as a pH adjuster to adjust the pH of the slurry to 3.

[0135] Copper sulfate was used as the activator, and its dosage was 15g / t;

[0136] #2 oil is a foaming agent, and its dosage is 0g / t.

[0137] Example 2

[0138] A method for recovering sulfur and cobalt from sulfur- and cobalt-containing vanadium-titanium iron concentrate includes the following steps:

[0139] Step S1: The vanadium-titanium iron concentrate containing sulfur and cobalt is subjected to a first grinding process to obtain a slurry, wherein the slurry contains 95% particles with a particle size of less than 43 μm.

[0140] The first grinding process can be carried out using a tower mill.

[0141] Step S2: The slurry is processed by a sulfur-cobalt mixed flotation process to obtain sulfur-cobalt concentrate and desulfurized iron concentrate;

[0142] The sulfur-cobalt mixed flotation process includes a first roughing process I, a first cleaning process I, a first cleaning process II, and a first scavenging process I; wherein, the intermediate tailings output from the first cleaning process I, the first cleaning process II, and the first scavenging process I are returned sequentially.

[0143] The input to the first roughing process I is the ore; one output of the first roughing process I is processed sequentially through the first cleaning process I and the first cleaning process II to obtain cobalt-sulfur concentrate; the other output of the first roughing process I is processed through the first scavenging process I to obtain desulfurized iron concentrate.

[0144] The equipment used in the sulfur-cobalt mixed flotation process is an aerated mechanical stirring flotation machine.

[0145] One of the outputs of the first fine-selection II of the sulfur-cobalt mixed flotation process is sulfur-cobalt concentrate; one of the outputs of the first scavenging I of the sulfur-cobalt mixed flotation process is desulfurized iron concentrate.

[0146] In this embodiment of the invention, in the first roughing stage I of the sulfur-cobalt mixed flotation process:

[0147] Acid is used as a pH adjuster to adjust the pH of the slurry to 6.

[0148] Xanthium was used as the collector, and its dosage was 600g / t;

[0149] #2 oil is a foaming agent, and its dosage is 60g / t.

[0150] In this embodiment of the invention, in the first scavenging step I of the sulfur-cobalt mixed flotation process:

[0151] Use sulfuric acid as a pH adjuster to adjust the pH of the slurry to 6;

[0152] Xanthium was used as the collector, and its dosage was 250g / t;

[0153] #2 oil is a foaming agent, and its dosage is 60g / t;

[0154] It should be noted that neither the first selection process (I) nor the first selection process (II) in the sulfur-cobalt mixed flotation process contain any additives.

[0155] Step S3: The cobalt sulfide concentrate is subjected to a second grinding process to obtain a cobalt sulfide concentrate slurry, wherein the content of particles with a particle size of less than 38 μm in the cobalt sulfide concentrate slurry is 95%.

[0156] The second grinding process can be achieved using an Isa mill.

[0157] Step S4: Process the sulfur-cobalt concentrate slurry through a sulfur-cobalt separation flotation process to obtain cobalt concentrate and low-grade sulfur concentrate;

[0158] The sulfur-cobalt separation flotation process includes a second rougher flotation I, a second cleaner flotation I, a second cleaner flotation II, a second cleaner flotation III, a second scavenger flotation I, and a second scavenger flotation II. The intermediate tailings output from the second cleaner flotation I, second cleaner flotation II, second cleaner flotation III, second scavenger flotation I, and second scavenger flotation II are sequentially returned.

[0159] In this embodiment of the invention, the input of the second roughing process I is a sulfur-cobalt concentrate slurry. One output of the second roughing process I is sequentially processed through the second cleaning process I, the second cleaning process II, and the second cleaning process III to obtain cobalt concentrate. The other output of the second roughing process I is sequentially processed through the second scavenging process I and the second scavenging process II to obtain low-grade sulfur concentrate.

[0160] In this embodiment of the invention, the equipment used in the sulfur-cobalt separation flotation process is a flotation column or a jet flotation column.

[0161] In this embodiment of the invention, in the second roughing stage I of the sulfur-cobalt separation flotation process:

[0162] Lime was used as a pH adjuster to adjust the pH of the slurry to 10;

[0163] A mixture of sodium thiosulfate and sodium humate was used as an inhibitor, with a ratio of 60%:40% and a dosage of 20-100 g / t.

[0164] Xanthium was used as the collector, and its dosage was 100g / t;

[0165] #2 oil is a foaming agent, and its dosage is 40g / t.

[0166] In the second scavenging step of the sulfur-cobalt separation flotation process:

[0167] Lime was used as a pH adjuster to adjust the pH of the slurry to 10;

[0168] A mixture of sodium thiosulfate and sodium humate is used as an inhibitor, with a ratio of 60%:40% and a dosage of 10-50 g / t.

[0169] Xanthium was used as the collector, and its dosage was 50g / t;

[0170] #2 oil is a foaming agent, and its dosage is 20g / t.

[0171] In the second scavenging stage II of the sulfur-cobalt separation flotation process:

[0172] Lime was used as a pH adjuster to adjust the pH of the slurry to 10;

[0173] A mixture of sodium thiosulfate and sodium humate was used as an inhibitor, with a ratio of 60%:40% and a dosage of 25g / t.

[0174] Xanthium was used as the collector, and its dosage was 25g / t;

[0175] #2 oil is a foaming agent, and its dosage is 20g / t.

[0176] In the second refining stage I of the sulfur-cobalt separation flotation process:

[0177] Lime was used as a pH adjuster to adjust the pH of the slurry to 10;

[0178] A mixture of sodium thiosulfate and sodium humate was used as the inhibitor, with a ratio of 60%:40% and a dosage of 50g / t.

[0179] It should be noted that no reagents were added in the second selection process (II and III) of the sulfur-cobalt separation flotation process.

[0180] Step S5: The low-grade sulfur concentrate is processed by sulfur beneficiation process to obtain sulfur concentrate and tailings by sulfur flotation.

[0181] In this embodiment of the invention, the sulfur beneficiation process includes a third roughing process I, a third beneficiation process I, and a third scavenging process I; wherein, the intermediate tailings output from the third beneficiation process I and the third scavenging process I are returned sequentially.

[0182] In this embodiment of the invention, the input of the third roughing process I is low-grade sulfur concentrate; one output of the third roughing process I is processed through the third cleaning process I to obtain sulfur concentrate; and another output of the third roughing process I is processed through the third scavenging process I to obtain tailings.

[0183] The sulfur beneficiation process uses an aerated mechanical agitation flotation machine.

[0184] In the third coarse selection I of the sulfur refining process:

[0185] Sulfuric acid was used as a pH adjuster to adjust the pH of the slurry to 5.

[0186] Copper sulfate is used as the activator, and its dosage is 100g / t;

[0187] #2 oil is a foaming agent, and its dosage is 20g / t.

[0188] In the third scavenging step of the sulfur refining process:

[0189] Sulfuric acid was used as a pH adjuster to adjust the pH of the slurry to 5.

[0190] Copper sulfate is used as the activator, and its dosage is 50g / t;

[0191] #2 oil is a foaming agent, and its dosage is 20g / t.

[0192] Example 3

[0193] A method for recovering sulfur and cobalt from sulfur- and cobalt-containing vanadium-titanium iron concentrate includes the following steps:

[0194] Step S1: The vanadium-titanium iron concentrate containing sulfur and cobalt is subjected to a first grinding process to obtain a slurry, wherein the content of particles with a particle size of less than 43μm in the slurry is 75%.

[0195] The first grinding process can be carried out using a tower mill.

[0196] Step S2: The slurry is processed by a sulfur-cobalt mixed flotation process to obtain sulfur-cobalt concentrate and desulfurized iron concentrate;

[0197] The sulfur-cobalt mixed flotation process includes a first roughing process I, a first cleaning process I, a first cleaning process II, and a first scavenging process I; wherein, the intermediate tailings output from the first cleaning process I, the first cleaning process II, and the first scavenging process I are returned sequentially.

[0198] The input to the first roughing process I is the ore; one output of the first roughing process I is processed sequentially through the first cleaning process I and the first cleaning process II to obtain cobalt-sulfur concentrate; the other output of the first roughing process I is processed through the first scavenging process I to obtain desulfurized iron concentrate.

[0199] The equipment used in the sulfur-cobalt mixed flotation process is an aerated mechanical stirring flotation machine.

[0200] One of the outputs of the first fine-selection II of the sulfur-cobalt mixed flotation process is sulfur-cobalt concentrate; one of the outputs of the first scavenging I of the sulfur-cobalt mixed flotation process is desulfurized iron concentrate.

[0201] In this embodiment of the invention, in the first roughing stage I of the sulfur-cobalt mixed flotation process:

[0202] The acid was used as a pH adjuster to adjust the pH of the slurry to 4.5.

[0203] Xanthium was used as the collector, and its dosage was 200g / t;

[0204] #2 oil is a foaming agent, and its dosage is 45g / t.

[0205] In this embodiment of the invention, in the first scavenging step I of the sulfur-cobalt mixed flotation process:

[0206] Sulfuric acid was used as a pH adjuster to adjust the pH of the slurry to 4.5;

[0207] Xanthium was used as the collector, and its dosage was 100g / t;

[0208] #2 oil is a foaming agent, and its dosage is 40g / t;

[0209] It should be noted that neither the first selection process (I) nor the first selection process (II) in the sulfur-cobalt mixed flotation process contain any additives.

[0210] Step S3: The cobalt sulfide concentrate is subjected to a second grinding process to obtain a cobalt sulfide concentrate slurry, wherein the content of particles with a particle size of less than 38 μm in the cobalt sulfide concentrate slurry is 75%.

[0211] The second grinding process can be achieved using an Isa mill.

[0212] Step S4: Process the sulfur-cobalt concentrate slurry through a sulfur-cobalt separation flotation process to obtain cobalt concentrate and low-grade sulfur concentrate;

[0213] The sulfur-cobalt separation flotation process includes a second rougher flotation I, a second cleaner flotation I, a second cleaner flotation II, a second cleaner flotation III, a second scavenger flotation I, and a second scavenger flotation II. The intermediate tailings output from the second cleaner flotation I, second cleaner flotation II, second cleaner flotation III, second scavenger flotation I, and second scavenger flotation II are sequentially returned.

[0214] In this embodiment of the invention, the input of the second roughing process I is a sulfur-cobalt concentrate slurry. One output of the second roughing process I is sequentially processed through the second cleaning process I, the second cleaning process II, and the second cleaning process III to obtain cobalt concentrate. The other output of the second roughing process I is sequentially processed through the second scavenging process I and the second scavenging process II to obtain low-grade sulfur concentrate.

[0215] In this embodiment of the invention, the equipment used in the sulfur-cobalt separation flotation process is a flotation column or a jet flotation column.

[0216] In this embodiment of the invention, in the second roughing stage I of the sulfur-cobalt separation flotation process:

[0217] Lime was used as a pH adjuster to adjust the pH of the slurry to 8.5;

[0218] A mixture of sodium thiosulfate and sodium humate was used as an inhibitor, with a ratio of 30%:80% and a dosage of 40g / t.

[0219] Xanthium was used as the collector, and its dosage was 40g / t;

[0220] #2 oil is a foaming agent, and its dosage is 10g / t.

[0221] In the second scavenging step of the sulfur-cobalt separation flotation process:

[0222] Lime was used as a pH adjuster to adjust the pH of the slurry to 8.5;

[0223] A mixture of sodium thiosulfate and sodium humate was used as an inhibitor in a ratio of 30% to 8%, and the dosage was 20 g / t.

[0224] Xanthium was used as the collector, and its dosage was 20g / t;

[0225] #2 oil is a foaming agent, and its dosage is 8g / t.

[0226] In the second scavenging stage II of the sulfur-cobalt separation flotation process:

[0227] Lime was used as a pH adjuster to adjust the pH of the slurry to 8.5;

[0228] A mixture of sodium thiosulfate and sodium humate was used as an inhibitor, with a ratio of 30%:80%, and a dosage of 10g / t.

[0229] Xanthium was used as the collector, and its dosage was 10g / t;

[0230] #2 oil is a foaming agent, and its dosage is 5g / t.

[0231] In the second refining stage I of the sulfur-cobalt separation flotation process:

[0232] Lime was used as a pH adjuster to adjust the pH of the slurry to 8.5;

[0233] A mixture of sodium thiosulfate and sodium humate was used as an inhibitor, with a ratio of 30%:80% and a dosage of 20g / t.

[0234] It should be noted that no reagents were added in the second selection process (II and III) of the sulfur-cobalt separation flotation process.

[0235] Step S5: The low-grade sulfur concentrate is processed by sulfur beneficiation process to obtain sulfur concentrate and tailings by sulfur flotation.

[0236] In this embodiment of the invention, the sulfur beneficiation process includes a third roughing process I, a third beneficiation process I, and a third scavenging process I; wherein, the intermediate tailings output from the third beneficiation process I and the third scavenging process I are returned sequentially.

[0237] In this embodiment of the invention, the input of the third roughing process I is low-grade sulfur concentrate; one output of the third roughing process I is processed through the third cleaning process I to obtain sulfur concentrate; and another output of the third roughing process I is processed through the third scavenging process I to obtain tailings.

[0238] The sulfur beneficiation process uses an aerated mechanical agitation flotation machine.

[0239] In the third coarse selection I of the sulfur refining process:

[0240] Sulfuric acid was used as a pH adjuster to adjust the pH of the slurry to 3.5;

[0241] Copper sulfate was used as the activator, and its dosage was 40g / t;

[0242] #2 oil is a foaming agent, and its dosage is 5g / t.

[0243] In the third scavenging step of the sulfur refining process:

[0244] Sulfuric acid was used as a pH adjuster to adjust the pH of the slurry to 3.5;

[0245] Copper sulfate was used as the activator, and its dosage was 25g / t;

[0246] #2 oil is a foaming agent, and its dosage is 5g / t.

[0247] Example 4

[0248] A method for recovering sulfur and cobalt from sulfur- and cobalt-containing vanadium-titanium iron concentrate includes the following steps:

[0249] Step S1: The vanadium-titanium iron concentrate containing sulfur and cobalt is subjected to a first grinding process to obtain a slurry, wherein the slurry contains 95% particles with a particle size of less than 43 μm.

[0250] The first grinding process can be carried out using a tower mill.

[0251] Step S2: The slurry is processed by a sulfur-cobalt mixed flotation process to obtain sulfur-cobalt concentrate and desulfurized iron concentrate;

[0252] The sulfur-cobalt mixed flotation process includes a first roughing process I, a first cleaning process I, a first cleaning process II, and a first scavenging process I; wherein, the intermediate tailings output from the first cleaning process I, the first cleaning process II, and the first scavenging process I are returned sequentially.

[0253] The input to the first roughing process I is the ore; one output of the first roughing process I is processed sequentially through the first cleaning process I and the first cleaning process II to obtain cobalt-sulfur concentrate; the other output of the first roughing process I is processed through the first scavenging process I to obtain desulfurized iron concentrate.

[0254] The equipment used in the sulfur-cobalt mixed flotation process is an aerated mechanical stirring flotation machine.

[0255] One of the outputs of the first fine-selection II of the sulfur-cobalt mixed flotation process is sulfur-cobalt concentrate; one of the outputs of the first scavenging I of the sulfur-cobalt mixed flotation process is desulfurized iron concentrate.

[0256] In this embodiment of the invention, in the first roughing stage I of the sulfur-cobalt mixed flotation process:

[0257] The acid is used as a pH adjuster to adjust the pH of the slurry to 6.5;

[0258] Xanthium was used as the collector, and its dosage was 500g / t;

[0259] #2 oil is a foaming agent, and its dosage is 55g / t.

[0260] In this embodiment of the invention, in the first scavenging step I of the sulfur-cobalt mixed flotation process:

[0261] Sulfuric acid was used as a pH adjuster to adjust the pH of the slurry to 5.5;

[0262] Xanthium was used as the collector, and its dosage was 200g / t;

[0263] #2 oil is a foaming agent, and its dosage is 50g / t;

[0264] It should be noted that neither the first selection process (I) nor the first selection process (II) in the sulfur-cobalt mixed flotation process contain any additives.

[0265] Step S3: The cobalt sulfide concentrate is subjected to a second grinding process to obtain a cobalt sulfide concentrate slurry, wherein the content of particles with a particle size of less than 38 μm in the cobalt sulfide concentrate slurry is 85%.

[0266] The second grinding process can be achieved using an Isa mill.

[0267] Step S4: Process the sulfur-cobalt concentrate slurry through a sulfur-cobalt separation flotation process to obtain cobalt concentrate and low-grade sulfur concentrate;

[0268] The sulfur-cobalt separation flotation process includes a second rougher flotation I, a second cleaner flotation I, a second cleaner flotation II, a second cleaner flotation III, a second scavenger flotation I, and a second scavenger flotation II. The intermediate tailings output from the second cleaner flotation I, second cleaner flotation II, second cleaner flotation III, second scavenger flotation I, and second scavenger flotation II are sequentially returned.

[0269] In this embodiment of the invention, the input of the second roughing process I is a sulfur-cobalt concentrate slurry. One output of the second roughing process I is sequentially processed through the second cleaning process I, the second cleaning process II, and the second cleaning process III to obtain cobalt concentrate. The other output of the second roughing process I is sequentially processed through the second scavenging process I and the second scavenging process II to obtain low-grade sulfur concentrate.

[0270] In this embodiment of the invention, the equipment used in the sulfur-cobalt separation flotation process is a flotation column or a jet flotation column.

[0271] In this embodiment of the invention, in the second roughing stage I of the sulfur-cobalt separation flotation process:

[0272] Lime was used as a pH adjuster to adjust the pH of the slurry to 9.5;

[0273] A mixture of sodium thiosulfate and sodium humate was used as an inhibitor in a ratio of 50% to 40%, and the dosage was 80 g / t.

[0274] Xanthium was used as the collector, and its dosage was 80g / t;

[0275] #2 oil is a foaming agent, and its dosage is 30g / t.

[0276] In the second scavenging step of the sulfur-cobalt separation flotation process:

[0277] Lime was used as a pH adjuster to adjust the pH of the slurry to 9.5;

[0278] A mixture of sodium thiosulfate and sodium humate was used as an inhibitor in a ratio of 50% to 40%, and the dosage was 40 g / t.

[0279] Xanthium was used as the collector, and its dosage was 40g / t;

[0280] #2 oil is a foaming agent, and its dosage is 12g / t.

[0281] In the second scavenging stage II of the sulfur-cobalt separation flotation process:

[0282] Lime was used as a pH adjuster to adjust the pH of the slurry to 9.5;

[0283] A mixture of sodium thiosulfate and sodium humate was used as an inhibitor in a ratio of 50% to 40%, and the dosage was 20 g / t.

[0284] Xanthium was used as the collector, and its dosage was 20g / t;

[0285] #2 oil is a foaming agent, and its dosage is 15g / t.

[0286] In the second refining stage I of the sulfur-cobalt separation flotation process:

[0287] Lime was used as a pH adjuster to adjust the pH of the slurry to 9.5;

[0288] A mixture of sodium thiosulfate and sodium humate was used as the inhibitor, with a ratio of 50%:40% and a dosage of 40g / t.

[0289] It should be noted that no reagents were added in the second selection process (II and III) of the sulfur-cobalt separation flotation process.

[0290] Step S5: The low-grade sulfur concentrate is processed by sulfur beneficiation process to obtain sulfur concentrate and tailings by sulfur flotation.

[0291] In this embodiment of the invention, the sulfur beneficiation process includes a third roughing process I, a third beneficiation process I, and a third scavenging process I; wherein, the intermediate tailings output from the third beneficiation process I and the third scavenging process I are returned sequentially.

[0292] In this embodiment of the invention, the input of the third roughing process I is low-grade sulfur concentrate; one output of the third roughing process I is processed through the third cleaning process I to obtain sulfur concentrate; and another output of the third roughing process I is processed through the third scavenging process I to obtain tailings.

[0293] The sulfur beneficiation process uses an aerated mechanical agitation flotation machine.

[0294] In the third coarse selection I of the sulfur refining process:

[0295] Sulfuric acid was used as a pH adjuster to adjust the pH of the slurry to 4.5;

[0296] Copper sulfate was used as the activator, and its dosage was 80 g / t;

[0297] #2 oil is a foaming agent, and its dosage is 15g / t.

[0298] In the third scavenging step of the sulfur refining process:

[0299] Sulfuric acid was used as a pH adjuster to adjust the pH of the slurry to 4.5;

[0300] Copper sulfate was used as the activator, and its dosage was 40g / t;

[0301] #2 oil is a foaming agent, and its dosage is 15g / t.

[0302] Example 5

[0303] A method for recovering sulfur and cobalt from sulfur- and cobalt-containing vanadium-titanium iron concentrate includes the following steps:

[0304] Step S1: The vanadium-titanium iron concentrate containing sulfur and cobalt is subjected to a first grinding process to obtain a slurry, wherein the content of particles with a particle size of less than 43μm in the slurry is 85%.

[0305] The first grinding process can be carried out using a tower mill.

[0306] Step S2: The slurry is processed by a sulfur-cobalt mixed flotation process to obtain sulfur-cobalt concentrate and desulfurized iron concentrate;

[0307] The sulfur-cobalt mixed flotation process includes a first roughing process I, a first cleaning process I, a first cleaning process II, and a first scavenging process I; wherein, the intermediate tailings output from the first cleaning process I, the first cleaning process II, and the first scavenging process I are returned sequentially.

[0308] The input to the first roughing process I is the ore; one output of the first roughing process I is processed sequentially through the first cleaning process I and the first cleaning process II to obtain cobalt-sulfur concentrate; the other output of the first roughing process I is processed through the first scavenging process I to obtain desulfurized iron concentrate.

[0309] The equipment used in the sulfur-cobalt mixed flotation process is an aerated mechanical stirring flotation machine.

[0310] One of the outputs of the first fine-selection II of the sulfur-cobalt mixed flotation process is sulfur-cobalt concentrate; one of the outputs of the first scavenging I of the sulfur-cobalt mixed flotation process is desulfurized iron concentrate.

[0311] In this embodiment of the invention, in the first roughing stage I of the sulfur-cobalt mixed flotation process:

[0312] Acid is used as a pH adjuster to adjust the pH of the slurry to 5.

[0313] Xanthium was used as the collector, and its dosage was 350 g / t;

[0314] #2 oil is a foaming agent, and its dosage is 50g / t.

[0315] In this embodiment of the invention, in the first scavenging step I of the sulfur-cobalt mixed flotation process:

[0316] Use sulfuric acid as a pH adjuster to adjust the pH of the slurry to 5;

[0317] Xanthium was used as the collector, and its dosage was 150g / t;

[0318] #2 oil is a foaming agent, and its dosage is 45g / t;

[0319] It should be noted that neither the first selection process (I) nor the first selection process (II) in the sulfur-cobalt mixed flotation process contain any additives.

[0320] Step S3: The cobalt sulfide concentrate is subjected to a second grinding process to obtain a cobalt sulfide concentrate slurry, wherein the content of particles with a particle size of less than 38 μm in the cobalt sulfide concentrate slurry is 80%.

[0321] The second grinding process can be achieved using an Isa mill.

[0322] Step S4: Process the sulfur-cobalt concentrate slurry through a sulfur-cobalt separation flotation process to obtain cobalt concentrate and low-grade sulfur concentrate;

[0323] The sulfur-cobalt separation flotation process includes a second rougher flotation I, a second cleaner flotation I, a second cleaner flotation II, a second cleaner flotation III, a second scavenger flotation I, and a second scavenger flotation II. The intermediate tailings output from the second cleaner flotation I, second cleaner flotation II, second cleaner flotation III, second scavenger flotation I, and second scavenger flotation II are sequentially returned.

[0324] In this embodiment of the invention, the input of the second roughing process I is a sulfur-cobalt concentrate slurry. One output of the second roughing process I is sequentially processed through the second cleaning process I, the second cleaning process II, and the second cleaning process III to obtain cobalt concentrate. The other output of the second roughing process I is sequentially processed through the second scavenging process I and the second scavenging process II to obtain low-grade sulfur concentrate.

[0325] In this embodiment of the invention, the equipment used in the sulfur-cobalt separation flotation process is a flotation column or a jet flotation column.

[0326] In this embodiment of the invention, in the second roughing stage I of the sulfur-cobalt separation flotation process:

[0327] Lime was used as a pH adjuster to adjust the pH of the slurry to 9.

[0328] A mixture of sodium thiosulfate and sodium humate is used as an inhibitor, with a ratio of 40% to 60% and a dosage of 20–100 g / t.

[0329] Xanthium was used as the collector, and its dosage was 60g / t;

[0330] #2 oil is a foaming agent, and its dosage is 20g / t.

[0331] In the second scavenging step of the sulfur-cobalt separation flotation process:

[0332] Lime was used as a pH adjuster to adjust the pH of the slurry to 9.

[0333] A mixture of sodium thiosulfate and sodium humate was used as an inhibitor, with a ratio of 40%:24% and a dosage of 30g / t.

[0334] Xanthium was used as the collector, and its dosage was 30g / t;

[0335] #2 oil is a foaming agent, and its dosage is 10g / t.

[0336] In the second scavenging stage II of the sulfur-cobalt separation flotation process:

[0337] Lime was used as a pH adjuster to adjust the pH of the slurry to 9.

[0338] A mixture of sodium thiosulfate and sodium humate was used as an inhibitor in a ratio of 40% to 60%, and the dosage was 15 g / t.

[0339] Xanthium was used as the collector, and its dosage was 15g / t;

[0340] #2 oil is a foaming agent, and its dosage is 10g / t.

[0341] In the second refining stage I of the sulfur-cobalt separation flotation process:

[0342] Lime was used as a pH adjuster to adjust the pH of the slurry to 9.

[0343] A mixture of sodium thiosulfate and sodium humate was used as an inhibitor, with a ratio of 40%:60% and a dosage of 30g / t.

[0344] It should be noted that no reagents were added in the second selection process (II and III) of the sulfur-cobalt separation flotation process.

[0345] Step S5: The low-grade sulfur concentrate is processed by sulfur beneficiation process to obtain sulfur concentrate and tailings by sulfur flotation.

[0346] In this embodiment of the invention, the sulfur beneficiation process includes a third roughing process I, a third beneficiation process I, and a third scavenging process I; wherein, the intermediate tailings output from the third beneficiation process I and the third scavenging process I are returned sequentially.

[0347] In this embodiment of the invention, the input of the third roughing process I is low-grade sulfur concentrate; one output of the third roughing process I is processed through the third cleaning process I to obtain sulfur concentrate; and another output of the third roughing process I is processed through the third scavenging process I to obtain tailings.

[0348] The sulfur beneficiation process uses an aerated mechanical agitation flotation machine.

[0349] In the third coarse selection I of the sulfur refining process:

[0350] Sulfuric acid was used as a pH adjuster to adjust the pH of the slurry to 4.

[0351] Copper sulfate was used as the activator, and its dosage was 60g / t;

[0352] #2 oil is a foaming agent, and its dosage is 10g / t.

[0353] In the third scavenging step of the sulfur refining process:

[0354] Sulfuric acid was used as a pH adjuster to adjust the pH of the slurry to 4.

[0355] Copper sulfate was used as the activator, and its dosage was 35g / t;

[0356] #2 oil is a foaming agent, and its dosage is 10g / t.

[0357] Example 7

[0358] In this example 7, vanadium-titanium iron concentrate from a beneficiation plant in Panzhihua was selected. The concentrate had a TFe grade of 53.25%, a TiO2 grade of 13.02%, a S grade of 0.84%, and a Co grade of 0.020%.

[0359] Table 1 Chemical composition analysis of vanadium-titanium iron concentrate from a mineral processing plant in Panzhihua

[0360]

[0361] This example specifically includes the following steps:

[0362] (1) The vanadium-titanium iron concentrate containing sulfur and cobalt is fed into the tower mill and the vanadium-titanium iron concentrate is ground to a particle size of less than 43 μm and a content of 82.50%.

[0363] (2) The slurry ground in step (1) is fed into the sulfur-cobalt mixed flotation process. Sulfuric acid is added as a pH adjuster to adjust the pH of the slurry to 5.5 in the first roughing stage I of the sulfur-cobalt mixed flotation process. Xanthate is added as a collector at a dosage of 150 g / t, and No. 2 oil is added as a frother at a dosage of 60 g / t. Sulfuric acid is added as a pH adjuster to adjust the pH of the slurry to 5.5 in the first scavenging stage I. Xanthate is added as a collector at a dosage of 50 g / t, and No. 2 oil is added as a frother at a dosage of 30 g / t. No additives are added in the first cleaning stage I and the first cleaning stage II. The sulfur-cobalt mixed flotation yields sulfur-cobalt concentrate and desulfurized iron concentrate.

[0364] (3) Feed the cobalt sulfide concentrate obtained in step (2) into the Isa mill and grind the cobalt sulfide concentrate until the particle size is less than 38 μm and the content is 80%;

[0365] (4) Feed the cobalt-sulfur concentrate slurry ground in step (3) into the cobalt-sulfur separation flotation process. Add lime as a pH adjuster to the second rougher I stage of the cobalt-sulfur separation flotation process to adjust the slurry pH to 9.0. Add a mixture of sodium thiosulfate and sodium humate as an inhibitor in a ratio of 50%:50% at a dosage of 100 g / t. Add xanthate as a collector at a dosage of 50 g / t. Add No. 2 oil as a frother at a dosage of 20 g / t. In the second scavenger I stage, add lime as a pH adjuster to adjust the slurry pH to 9.0. Add a mixture of sodium thiosulfate and sodium humate as an inhibitor in a ratio of 50%:50% at a dosage of 25 g / t. In the first stage of flotation, xanthate was added as a collector at a dosage of 25 g / t, and No. 2 oil was added as a frother at a dosage of 10 g / t. In the second scavenging stage II, lime was added as a pH adjuster to adjust the pulp pH to 9. A mixture of sodium thiosulfate and sodium humate (50%:50%) was added as a depressant at a dosage of 10 g / t. In the second cleaning stage I, lime was added as a pH adjuster to adjust the pulp pH to 9.0. A mixture of sodium thiosulfate and sodium humate (50%:50%) was added as a depressant at a dosage of 10 g / t. Both the second cleaning stages II and III involved the addition of reagents. The sulfur-cobalt separation flotation yielded cobalt concentrate and low-grade sulfur concentrate.

[0366] (5) The low-grade sulfur concentrate obtained in step (4) is fed into the sulfur beneficiation process. Sulfuric acid is added as a pH adjuster to the third roughing stage I of the sulfur beneficiation flotation process to adjust the pH value of the pulp to 4. Copper sulfate is used as an activator with a dosage of 60 g / t and No. 2 oil is used as a frother with a dosage of 20 g / t. Sulfuric acid is used as a pH adjuster to the third scavenging stage I to adjust the pH value of the pulp to 4. Copper sulfate is used as an activator with a dosage of 30 g / t and No. 2 oil is used as a frother with a dosage of 20 g / t. No reagents are added to the third beneficiation stage I. The sulfur beneficiation flotation yields sulfur concentrate and tailings.

[0367] (6) The final product specifications can be obtained by following the above steps, as shown in Table 2.

[0368] Table 2. Results of the recovery of sulfur and cobalt concentrates from vanadium-titanium iron concentrate at a mineral processing plant in Panzhihua.

[0369]

[0370] Example 8

[0371] In this embodiment, vanadium-titanium iron concentrate from a ore dressing plant in Xichang was selected. The iron concentrate contained 54.25% TFe, 10.02% TiO2, 0.75% S, and 0.023% Co.

[0372] Table 3 Chemical composition analysis of vanadium-titanium iron concentrate from a mineral processing plant in Xichang

[0373]

[0374]

[0375] This example specifically includes the following steps:

[0376] (1) The vanadium-titanium iron concentrate containing sulfur and cobalt is fed into the tower mill and the vanadium-titanium iron concentrate is ground to a particle size of less than 43 μm and a content of 85.50%.

[0377] (2) The slurry ground in step (1) is fed into the sulfur-cobalt mixed flotation process. Sulfuric acid is added as a pH adjuster to adjust the pH of the slurry to 4.5 in the first roughing stage I of the sulfur-cobalt mixed flotation process. Xanthate is added as a collector at a dosage of 200 g / t, and No. 2 oil is added as a frother at a dosage of 100 g / t. Sulfuric acid is added as a pH adjuster to adjust the pH of the slurry to 4.5 in the first scavenging stage I. Xanthate is added as a collector at a dosage of 60 g / t, and No. 2 oil is added as a frother at a dosage of 40 g / t. No additives are added in the first cleaning stage I and the first cleaning stage II. The sulfur-cobalt mixed flotation yields sulfur-cobalt concentrate and desulfurized iron concentrate.

[0378] (3) Feed the cobalt sulfide concentrate obtained in step (2) into the Isa mill and grind the cobalt sulfide concentrate until the particle size is less than 38 μm and the content is 85%;

[0379] (4) Feed the cobalt thiosulfate concentrate slurry ground in step (3) into the cobalt thiosulfate separation flotation process. Add lime as a pH adjuster to the second rougher I of the cobalt thiosulfate separation flotation process to adjust the pH of the slurry to 8.5. Add a mixture of sodium thiosulfate and sodium humate as an inhibitor in a ratio of 25%:75% at a dosage of 200 g / t. Add xanthate as a collector at a dosage of 50 g / t. Add No. 2 oil as a frother at a dosage of 20 g / t. Add lime as a pH adjuster to the second scavenger I process to adjust the pH of the slurry to 8.5. Add a mixture of sodium thiosulfate and sodium humate as an inhibitor in a ratio of 25%:75% at a dosage of 100 g / t. In the first scavenging stage, xanthate was added as a collector at a dosage of 25 g / t, and No. 2 oil was added as a frother at a dosage of 10 g / t. In the second scavenging stage II, lime was added as a pH adjuster to adjust the pulp pH to 8.5. A mixture of sodium thiosulfate and sodium humate (25%:75%) was added as a depressant at a dosage of 10 g / t. In the second cleaning stage I, lime was added as a pH adjuster to adjust the pulp pH to 8.5, and a mixture of sodium thiosulfate and sodium humate (25%:75%) was added as a depressant at a dosage of 20 g / t. Both the second cleaning stages II and III involved the addition of reagents. The sulfur-cobalt separation flotation yielded cobalt concentrate and low-grade sulfur concentrate.

[0380] (5) The low-grade sulfur concentrate obtained in step (4) is fed into the sulfur beneficiation process. Sulfuric acid is added as a pH adjuster to the third roughing stage I of the sulfur beneficiation flotation process to adjust the pH of the pulp to 3.5. Copper sulfate is used as an activator at a dosage of 75 g / t, and No. 2 oil is used as a frother at a dosage of 20 g / t. Sulfuric acid is used as a pH adjuster to the third scavenging stage I to adjust the pH of the pulp to 3.5. Copper sulfate is used as an activator at a dosage of 35 g / t, and No. 2 oil is used as a frother at a dosage of 20 g / t. No reagents are added to the third beneficiation stage I. The sulfur beneficiation flotation yields sulfur concentrate and tailings.

[0381] (6) The final product specifications can be obtained by following the above steps, as shown in Table 4.

[0382] Table 4. Results of the recovery of sulfur and cobalt concentrates from vanadium-titanium iron concentrate at a mineral processing plant in Xichang.

[0383]

[0384] The beneficial effects of this invention are:

[0385] (1) This invention reduces the S content in vanadium-titanium iron concentrate containing cobalt sulfur from 0.6% to 0.8% to below 0.2%, thereby improving the quality of vanadium-titanium iron concentrate and facilitating the realization of ultra-low SO2 emissions in the subsequent sintering process of vanadium-titanium iron concentrate;

[0386] (2) This method realizes the recovery and utilization of sulfur and cobalt in vanadium-titanium iron concentrate and separates sulfur and cobalt, obtaining separate cobalt concentrate and sulfur concentrate, wherein the cobalt concentrate has a Co grade ≥1.0% and the sulfur concentrate has a S grade ≥31.0%, which improves the comprehensive utilization rate and value of vanadium-titanium magnetite resources.

[0387] (3) The method uses an energy-saving tower mill and an abrasive mill, which can effectively reduce sulfur and cobalt in the process of recovering sulfur and cobalt.

[0388] (4) This method uses a flotation column or jet flotation machine to solve the problem of the difficulty in recovering cobalt sulfides in the existing process, and can effectively recover cobalt sulfides in the fine-grained range of ~15μm.

[0389] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A method for recovering sulfur and cobalt from sulfur- and cobalt-containing vanadium-titanium iron concentrate, characterized in that, The method includes the following steps: Step S1: The vanadium-titanium iron concentrate containing sulfur and cobalt is subjected to a first grinding process through a tower mill to obtain a slurry, wherein the content of particles with a particle size of less than 43 μm in the slurry is 75-95%; Step S2: The slurry is processed by a pneumatic mechanical agitation flotation machine to obtain sulfur-cobalt mixed flotation process to obtain sulfur-cobalt concentrate and desulfurized iron concentrate; Step S3: The cobalt sulfide concentrate is subjected to a second grinding process using an Isa mill to obtain a cobalt sulfide concentrate slurry, wherein the content of particles with a diameter of less than 38 μm in the cobalt sulfide concentrate slurry is 65-95%; Step S4: The sulfur-cobalt concentrate slurry is processed by a flotation column or jet flotation column to separate the sulfur and cobalt, so as to obtain cobalt concentrate and low-grade sulfur concentrate. Step S5: The low-grade sulfur concentrate is processed by sulfur beneficiation process to obtain sulfur concentrate and tailings by sulfur flotation.

2. The method for recovering sulfur and cobalt from sulfur- and cobalt-containing vanadium-titanium iron concentrate as described in claim 1, characterized in that, The sulfur-cobalt mixed flotation process includes a first roughing process I, a first cleaning process I, a first cleaning process II, and a first scavenging process I; wherein, the intermediate tailings output from the first cleaning process I, the first cleaning process II, and the first scavenging process I are returned sequentially.

3. The method for recovering sulfur and cobalt from sulfur- and cobalt-containing vanadium-titanium iron concentrate as described in claim 2, characterized in that, The input to the first roughing process I is the ore; one output of the first roughing process I is processed sequentially through the first cleaning process I and the first cleaning process II to obtain cobalt-sulfur concentrate; the other output of the first roughing process I is processed through the first scavenging process I to obtain desulfurized iron concentrate.

4. The method for recovering sulfur and cobalt from sulfur- and cobalt-containing vanadium-titanium iron concentrate as described in claim 1, characterized in that, The sulfur-cobalt separation flotation process includes a second rougher I, a second cleaner I, a second cleaner II, a second cleaner III, a second scavenger I, and a second scavenger II; wherein the intermediate tailings output from the second cleaner I, the second cleaner II, the second cleaner III, the second scavenger I, and the second scavenger II are returned sequentially.

5. The method for recovering sulfur and cobalt from sulfur- and cobalt-containing vanadium-titanium iron concentrate as described in claim 1, characterized in that, The input to the second rougher I is a sulfur-cobalt concentrate slurry. One output of the second rougher I is processed sequentially through the second cleaner I, the second cleaner II, and the second cleaner III to obtain cobalt concentrate. The other output of the second rougher I is processed sequentially through the second scavenger I and the second scavenger II to obtain low-grade sulfur concentrate.

6. The method for recovering sulfur and cobalt from sulfur- and cobalt-containing vanadium-titanium iron concentrate as described in claim 1, characterized in that, The sulfur beneficiation process includes a third roughing process (I), a third cleaning process (I), and a third scavenging process (I); wherein the intermediate tailings output from the third cleaning process (I) and the third scavenging process (I) are returned sequentially.

Images