Beneficiation method for efficiently recovering valuable elements from high-sulfur vanadium-titanium magnetite

Abstract

The present disclosure relates to the technical field of mineral processing, and provides a beneficiation method for efficiently recovering valuable elements from high-sulfur vanadium-titanium magnetite, comprising: crushing and grinding the raw ore to obtain beneficiation materials; performing first flotation, first low-intensity magnetic separation, re-grinding, second flotation and second low-intensity magnetic separation on the beneficiation materials to obtain a first sulfur rough concentrate, a first iron tailings, a second sulfur rough concentrate, a second iron tailings and an iron concentrate; combining the first sulfur rough concentrate and the second sulfur rough concentrate to perform blank concentration to obtain a sulfur concentrate; combining the first iron tailings and the second iron tailings to perform screening classification to obtain a sieve material and a sieve under material; performing gravity separation and high-intensity magnetic separation on the sieve material and the sieve under material respectively to obtain a first pre-concentration titanium concentrate and a second pre-concentration titanium concentrate; and combining the first pre-concentration titanium concentrate and the second pre-concentration titanium concentrate to perform third flotation to obtain a titanium concentrate. The beneficiation method has the advantages of simple method, low cost and good recovery effect.

Description

Technical Field

[0001] This disclosure relates to the field of mineral processing technology, for example to a beneficiation method for efficiently recovering valuable elements from high-sulfur vanadium-titanium magnetite. Background Technology

[0002] Vanadium-titanium magnetite is not only an important supplement to iron ore but also a major carrier of vanadium and titanium resources. Some ores also contain associated elements such as chromium, cobalt, scandium, and gallium, making it a raw material for steel and other rare metals like vanadium and titanium. For both the steel and non-ferrous metals industries, vanadium-titanium magnetite has extremely high strategic and comprehensive utilization value. my country is rich in vanadium-titanium magnetite resources, with proven reserves exceeding 18 billion tons, mainly distributed in Panzhihua, Sichuan and Chengde, Hebei. The Panxi region is my country's largest vanadium-titanium magnetite producing area, with reserves exceeding 10 billion tons. Besides the main elements iron, vanadium, and titanium, vanadium-titanium magnetite ore contains approximately 60 million tons of associated sulfur, 900,000 tons of cobalt, 700,000 tons of nickel, and 500,000 tons of copper, thus possessing high industrial utilization value. Therefore, the recovery and utilization of these resources would alleviate my country's resource shortage and provide strong support for the supply of strategic resources.

[0003] Currently, in the beneficiation process of vanadium-titanium magnetite, desulfurization during the flotation of titanium concentrate is the main way to recover cobalt sulfur from vanadium-titanium magnetite. However, research shows that about half of the cobalt sulfur cannot be recovered because it enters the iron beneficiation process before the titanium beneficiation process. Furthermore, the sulfur in vanadium-titanium magnetite generates a large amount of SO2 gas during sintering, and even after passing through a flue gas treatment system, this SO2 gas still causes significant environmental pollution. In addition to sulfur and cobalt resources, vanadium-titanium magnetite also contains large amounts of nickel and copper resources, which current beneficiation methods cannot effectively recover.

[0004] In summary, there is an urgent need for a beneficiation method for vanadium-titanium magnetite that can not only effectively recover sulfide mineral resources such as sulfur, cobalt, nickel, and copper from vanadium-titanium magnetite, but also reduce SO2 emissions, thereby improving the comprehensive utilization rate of resources and achieving energy conservation and emission reduction. Summary of the Invention

[0005] The purpose of this disclosure is to adapt to changes in ore properties and overcome the shortcomings of existing vanadium-titanium magnetite beneficiation methods, such as low resource utilization rates. It provides a beneficiation method for efficiently recovering valuable elements from high-sulfur vanadium-titanium magnetite, achieving not only effective recovery of valuable elements such as iron, vanadium, titanium, cobalt, nickel, copper, and sulfur from high-sulfur vanadium-titanium magnetite to reduce resource waste, but also reducing the sulfur content in the resulting iron concentrate to decrease SO2 emissions and improve the quality of the iron concentrate. This, in turn, enhances resource utilization and achieves energy conservation and emission reduction.

[0006] The purpose of this disclosure is achieved through the following technical solution:

[0007] On the one hand, a beneficiation method for efficiently recovering valuable elements from high-sulfur vanadium-titanium magnetite is provided. The beneficiation method includes: sequentially crushing and grinding the raw ore to obtain beneficiated feedstock; performing a first flotation on the beneficiated feedstock to obtain a first sulfur rough concentrate and a first sulfur tailings; performing a first weak magnetic separation on the first sulfur tailings to obtain an iron rough concentrate and a first iron tailings; re-grinding the iron rough concentrate to obtain a refractory iron rough concentrate; performing a second flotation on the refractory iron rough concentrate to obtain a second sulfur rough concentrate and a second sulfur tailings; performing a second weak magnetic separation on the second sulfur tailings to obtain an iron concentrate and a second iron tailings; combining the first sulfur rough concentrate and the second sulfur rough concentrate to obtain a third sulfur rough concentrate; and further processing the... The third sulfur rough concentrate is subjected to blank cleaning to obtain sulfur concentrate and sulfur tailings; the first iron tailings and the second iron tailings are combined to obtain titanium-selected material; the titanium-selected material is screened and classified to obtain oversize and undersize material; the oversize material is subjected to gravity separation to obtain a first pre-enriched titanium concentrate and a first pre-enriched tailings; the undersize material is subjected to strong magnetic separation to obtain a second pre-enriched titanium concentrate and a second pre-enriched tailings; the first pre-enriched titanium concentrate and the second pre-enriched titanium concentrate are combined to obtain a third pre-enriched titanium concentrate; and the third pre-enriched titanium concentrate is subjected to third flotation to obtain titanium concentrate and titanium-selected tailings.

[0008] It is worth noting that the mineral processing method provided in this disclosure, by performing a sulfur removal process (i.e., the first flotation and the second flotation) before all beneficiation operations to select sulfide minerals (i.e., the first sulfur rough concentrate and the second sulfur rough concentrate), can not only effectively recover sulfur, cobalt, nickel, copper and other sulfide mineral resources in the high-sulfur vanadium-titanium magnetite, but also reduce the sulfur content in the first iron tailings, the second iron tailings and the iron concentrate. Based on this, since the sulfur content in the iron concentrate is reduced, SO2 emissions can be reduced and the quality of the iron concentrate can be improved. Since the sulfur content in the first and second iron tailings is reduced, no additional sulfur removal process is needed when using the first and second iron tailings for titanium beneficiation processes (e.g., the third flotation), and the quality of the titanium concentrate can still be guaranteed and improved. The process of performing two flotation steps for desulfurization (i.e., the first flotation and the second flotation) avoids the problem of incomplete separation between iron ore and sulfide minerals, thereby improving the grade of the iron concentrate and the recovery rate of the sulfide minerals. The strong magnetic separation of the undersize material improves the separation effect. The gravity separation of the oversize material effectively removes gangue minerals, reducing the mineral throughput and reagent usage of the third flotation, thus improving efficiency and saving costs. Furthermore, the gravity separation also has the advantages of energy saving and ease of operation.

[0009] In summary, the mineral processing method provided in this disclosure can not only effectively recover valuable elements such as iron, vanadium, titanium, cobalt, nickel, copper, and sulfur from the high-sulfur vanadium-titanium magnetite to reduce resource waste, but also reduce SO2 emissions. Furthermore, it can improve the quality of the iron concentrate and the titanium concentrate, thereby achieving at least the effects of improving the comprehensive utilization rate of resources and energy conservation and emission reduction, and has good economic and environmental benefits.

[0010] In some embodiments, the raw ore is the raw ore of the high-sulfur vanadium-titanium magnetite; wherein the TFe grade is 18% to 30%, the TiO2 grade is 5% to 10%, and the S grade is 0.5% to 1.5%.

[0011] In some embodiments, the weight percentage of minerals with a particle size of -0.074 mm in the beneficiated mineral material is 30% to 60%.

[0012] It should be noted that the above statement "the weight percentage of minerals with a particle size of -0.074mm in the mineral processing material is 30% to 60%" can also be understood as "the fineness of the grinding is -0.074mm 30% to 60%", and the two have the same meaning.

[0013] In some examples, the grinding is carried out using a ball mill.

[0014] In the above embodiments, by limiting the fineness of the grinding, the separation effect can be guaranteed, thereby ensuring the grade and recovery rate of the concentrate.

[0015] In some embodiments, the weight percentage of minerals with a particle size of -0.038 mm in the regrinded iron concentrate is 60% to 90%.

[0016] It should be noted that the above statement "the weight percentage of minerals with a particle size of -0.038mm in the refmilled iron concentrate is 60% to 90%" can also be understood as "the fineness of the refmilled ore is -0.038mm 60% to 90%", and the two have the same meaning.

[0017] In some examples, the re-grinding is performed using a ball mill.

[0018] In the above embodiments, by limiting the fineness of the re-grinding, the separation effect can be guaranteed, thereby ensuring the grade and recovery rate of the concentrate.

[0019] In some embodiments, the first flotation employs a first collector, a first modifier, and a first frother; wherein the first collector comprises butyl xanthate; the first modifier comprises sulfuric acid and copper sulfate; and the first frother comprises No. 2 oil.

[0020] In some examples, the butyl xanthate used in the first collector is 300-500 g / t·feed.

[0021] In some examples, the amount of sulfuric acid used in the first modifier is 700-1000 g / t·feed, and the amount of copper sulfate used is 200-400 g / t·feed.

[0022] In some examples, the amount of No. 2 oil used in the first foaming agent is 25-75 g / t·feed.

[0023] In some embodiments, the second flotation employs a second collector, a second modifier, and a second frother; wherein the second collector comprises butyl xanthate; the second modifier comprises sulfuric acid and copper sulfate; and the second frother comprises No. 2 oil.

[0024] In some examples, the butyl xanthate is used in the second collector at a rate of 100–300 g / t·feed.

[0025] In some examples, the amount of sulfuric acid used in the second modifier is 200-400 g / t·feed, and the amount of copper sulfate used is 100-200 g / t·feed.

[0026] In some examples, the amount of No. 2 oil used in the second foaming agent is 25-50 g / t·feed.

[0027] It should be noted that the working principles of the first and second collectors are largely the same, both including: selectively adsorbing onto the mineral surface, increasing the hydrophobicity of the mineral surface, making it easier for it to adhere to air bubbles, thereby improving the floatability of the mineral. Similarly, the working principles of the first and second frothers are largely the same, both including: adjusting the interaction between the corresponding collector and the mineral, thereby promoting or inhibiting the floatability of the mineral, and adjusting the pH and ionic composition of the pulp; wherein, the copper sulfate is an activator for promoting mineral flotation, and the sulfuric acid is an inhibitor for adjusting the pH of the pulp and inhibiting the floatability of gangue minerals. Likewise, the working principles of the first and second frothers are largely the same, both including: reducing the surface tension of water to form foam, allowing air bubbles in the pulp to adhere to selectively floating mineral particles.

[0028] In some embodiments, the magnetic field strength of the first weak magnetic separation is 111.4 to 143.28 kA / m.

[0029] In some examples, the magnetic field strength of the first weak magnetic separation is 111.4 kA / m.

[0030] In the above embodiments, by limiting the magnetic field strength of the first weak magnetic separation, the magnetic field strength of the first weak magnetic separation can be maintained at a relatively high level. This not only effectively recovers strongly magnetic minerals (i.e., vanadium-titanium iron concentrate), but also avoids recovering moderately magnetic and weakly magnetic minerals, thus achieving the effect of improving the TFe recovery rate in the iron concentrate.

[0031] In some embodiments, the magnetic field strength of the second weak magnetic selector is 79.6 to 95.5 kA / m.

[0032] In some examples, the magnetic field strength of the second weak magnetic separation is 95.5 kA / m.

[0033] In the above embodiments, by limiting the magnetic field strength of the second weak magnetic separation, the magnetic field strength of the second weak magnetic separation can be kept at a relatively low level. This not only enables the more effective recovery of strongly magnetic minerals to further improve the recovery rate of the iron concentrate, but also enables the separation of moderately magnetic minerals and weakly magnetic minerals and their discharge as tailings to further improve the TFe grade in the iron concentrate.

[0034] In some embodiments, the blank selection is performed at least three times.

[0035] In some examples, the blank selection is performed three times.

[0036] In some embodiments, the particle size of the material over the screen is +0.1 mm, and the particle size of the material under the screen is -0.1 mm.

[0037] In the above embodiments, by limiting the particle size of both the oversize material and the undersize material, it is possible to avoid either gravity separation or strong magnetic separation having too much or too little ore, thus ensuring that both gravity separation and strong magnetic separation can be successfully implemented.

[0038] In some embodiments, the reselection includes at least one of shaking table reselection and spiral chute reselection.

[0039] In some embodiments, the strong magnetic separation includes at least one coarse separation and at least one fine separation; wherein the magnetic field strength of the coarse separation is 0.8 to 1.0 T; and the magnetic field strength of the fine separation is 0.6 to 0.8 T.

[0040] It should be noted that Tesla (T) and kiloampere per meter (KA / m) are both units of magnetic field strength, and T and KA / m can be converted to each other, i.e., 1T = 800KA / m. Therefore, the magnetic field strength of the coarse selection is 640-800KA / m, and the magnetic field strength of the fine selection is 480-640KA / m.

[0041] In some examples, the strong magnetic separation includes a coarse selection and a fine selection.

[0042] In some examples, the coarse magnetic field strength is 0.8T; the fine magnetic field strength is 0.6T.

[0043] In the above embodiments, by limiting the magnetic field strength of the roughing process, the recovery rate of the titanium concentrate can be guaranteed; on this basis, by limiting the magnetic field strength of the fine process, the recovery rate of the titanium concentrate and the TiO2 grade therein can be further guaranteed.

[0044] In some embodiments, the third flotation employs a third collector and a third modifier; wherein the third collector includes collector MOH; and the third modifier includes sulfuric acid.

[0045] In some examples, the amount of the collector MOH in the third collector is 3000-3500 g / t·feed, for example 3200 g / t·feed.

[0046] In some examples, the amount of sulfuric acid used in the third modifier is 3500-4500 g / t·feed, for example 4100 g / t·feed.

[0047] In the above embodiments, the collector MOH can collect ilmenite, and the sulfuric acid can act as a pH adjuster and inhibitor to suppress the flotation of gangue minerals. The combination of the collector MOH and the sulfuric acid can achieve the separation of ilmenite and gangue minerals.

[0048] In some embodiments, the third flotation includes at least one coarse flotation, at least one sweep flotation, and at least four fine flotations.

[0049] In some examples, the third flotation includes one coarse flotation, one sweep flotation, and four fine flotations.

[0050] For example, when the third flotation includes one roughing, one scavenging, and four cleaning stages, the reagent dosage in the third flotation is as follows:

[0051] In the first roughing process, the amount of collector MOH was 2500 g / t feed, and the amount of sulfuric acid was 2500 g / t feed.

[0052] In the first scavenging operation, the amount of collector MOH was 500 g / t·feed, and the amount of sulfuric acid was 500 g / t·feed.

[0053] In the four refining processes, the amount of collector MOH used in the first refining process was 200 g / t·feed, while the collector MOH was not used in the remaining three refining processes; the amounts of sulfuric acid used were 500 g / t·feed, 300 g / t·feed, 200 g / t·feed, and 100 g / t·feed, respectively.

[0054] The beneficial effects of this disclosure are:

[0055] 1. The present invention discloses a mineral processing method for efficiently recovering valuable elements from high-sulfur vanadium-titanium magnetite. This method can not only effectively recover valuable elements such as iron, vanadium, titanium, cobalt, nickel, copper, and sulfur from high-sulfur vanadium-titanium magnetite to reduce resource waste, but also reduce SO2 emissions. Furthermore, it can improve the quality of iron concentrate and titanium concentrate, thereby achieving at least the effects of improving the comprehensive utilization rate of resources and energy conservation and emission reduction, and has good economic and environmental benefits.

[0056] 2. The present invention discloses a mineral processing method for efficiently recovering valuable elements from high-sulfur vanadium-titanium magnetite, which pre-selects sulfide minerals through a sulfur beneficiation process before all beneficiation operations, eliminating the need for an additional sulfur beneficiation process during the titanium beneficiation process.

[0057] 3. The mineral processing method disclosed herein for efficiently recovering valuable elements from high-sulfur vanadium-titanium magnetite is applicable to the recovery of sulfide minerals in high-sulfur vanadium-titanium magnetite, and has the advantages of simple method, low cost and good recovery effect. Attached Figure Description

[0058] To more clearly illustrate the technical solutions in this disclosure, the accompanying drawings used in some embodiments of this disclosure will be briefly described below. Obviously, the drawings described below are merely drawings of some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings. Furthermore, the drawings described below can be regarded as schematic diagrams and are not intended to limit the actual process of the methods involved in the embodiments of this disclosure.

[0059] Figure 1 This disclosure provides a principle flowchart of a mineral processing method for efficiently recovering valuable elements from high-sulfur vanadium-titanium magnetite. Detailed Implementation

[0060] The technical solutions in some embodiments of this disclosure will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments provided in this disclosure, all other embodiments obtained by those skilled in the art are within the scope of protection of this disclosure.

[0061] Hereinafter, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature.

[0062] In describing some embodiments, the expression "A and / or B" may be used. It is readily understood that "A and / or B" includes the following three combinations: A only, B only, and a combination of A and B.

[0063] In describing some embodiments, the expressions "at least one of A, B and C" and "at least one of A, B or C" may be used, both of which have the same meaning and include the following combinations of A, B and C: only A, only B, only C, a combination of A and B, a combination of A and C, a combination of B and C, and a combination of A, B and C.

[0064] Example 1

[0065] A mineral processing method for efficiently recovering valuable elements from high-sulfur vanadium-titanium magnetite is disclosed. The raw ore to be processed comes from a vanadium-titanium magnetite deposit in the Panxi region. Multiple chemical analyses show that the ore contains 21.65% TFe, 6.43% TiO2, and 1.50% S, classifying it as a high-sulfur vanadium-titanium magnetite. Figure 1 As shown, the mineral processing method includes:

[0066] S1. The raw ore is crushed and then ground using a ball mill to obtain beneficiated material; wherein, the weight percentage of minerals with a particle size of -0.074mm in the beneficiated material is 50%, that is, the fineness of grinding is -0.074mm 50%;

[0067] S2. The beneficiation material is subjected to a first flotation to remove sulfur, yielding a first sulfur rough concentrate and a first sulfur tailings. The first flotation employs a first collector, a first modifier, and a first frother. The first collector is butyl xanthate, with a dosage of 500 g / t·feed. The first modifier consists of sulfuric acid and copper sulfate, with sulfuric acid at a dosage of 1000 g / t·feed and copper sulfate at a dosage of 400 g / t·feed. The first frother is No. 2 oil, with a dosage of 75 g / t·feed.

[0068] S3. The first weak magnetic separation is performed on the first sulfur tailings to rough iron, resulting in iron rough concentrate and the first iron tailings; wherein, the magnetic field strength of the first weak magnetic separation is 111.4 KA / m;

[0069] S4. The iron concentrate is re-ground using a ball mill to obtain refractory iron concentrate; wherein the weight percentage of minerals with a particle size of -0.038mm in the refractory iron concentrate is 90%, that is, the fineness of the re-grinding is -0.038mm 90%.

[0070] S5. The regrinded iron concentrate is subjected to a second flotation to remove sulfur, yielding a second sulfur concentrate and a second sulfur tailings. The second flotation employs a second collector, a second modifier, and a second frother. The second collector is butyl xanthate, used at a dosage of 100 g / t·feed. The second modifier consists of sulfuric acid and copper sulfate, with sulfuric acid used at a dosage of 200 g / t·feed and copper sulfate used at a dosage of 100 g / t·feed. The second frother is No. 2 oil, used at a dosage of 25 g / t·feed.

[0071] S6. The second weak magnetic separation is performed on the second sulfur tailings to further refine the iron, resulting in iron concentrate and second iron tailings; wherein the magnetic field strength of the second weak magnetic separation is 95.5 kA / m;

[0072] S7. Combine the first sulfur crude concentrate with the second sulfur crude concentrate to obtain the third sulfur crude concentrate;

[0073] S8. Perform three blank cleaning processes on the third sulfur rough concentrate to obtain sulfur concentrate and sulfur tailings;

[0074] S9. Combine the first iron tailings and the second iron tailings to obtain titanium-selected material;

[0075] S10. The titanium-selected material is screened and classified to obtain oversize material with a particle size of +0.1mm and undersize material with a particle size of -0.1mm;

[0076] S11. The material on the screen is subjected to spiral chute gravity separation to obtain the first pre-enriched titanium concentrate and the first pre-enriched tailings;

[0077] S12. The undersize material is subjected to strong magnetic separation to obtain the second pre-enriched titanium concentrate and the second pre-enriched tailings; wherein, the strong magnetic separation includes a roughing and a cleaning process, the magnetic field strength of the roughing process is 0.8T, and the magnetic field strength of the cleaning process is 0.6T.

[0078] S13. Combine the first pre-enriched titanium concentrate with the second pre-enriched titanium concentrate to obtain the third pre-enriched titanium concentrate;

[0079] S14. The third pre-enriched titanium concentrate is subjected to a third flotation to obtain titanium concentrate and titanium tailings. The third flotation includes a rougher, a scavenger, and a cleaner. The third flotation uses a third collector and a third modifier. The third collector is collector MOH, and the third modifier is sulfuric acid. In the first rougher, the amount of collector MOH is 2500 g / t·feed, and the amount of sulfuric acid is 2500 g / t·feed. In the first scavenger, the amount of collector MOH is 500 g / t·feed, and the amount of sulfuric acid is 500 g / t·feed. In the four cleaners, the amount of collector MOH is 200 g / t·feed in the first cleaner, and no collector MOH is used in the remaining three cleaners. The amounts of sulfuric acid are 500 g / t·feed, 300 g / t·feed, 200 g / t·feed, and 100 g / t·feed, respectively.

[0080] It should be noted that the purpose of S7-S8 is to recover sulfur concentrate, and the purpose of S9-S14 is to recover titanium concentrate. This embodiment does not restrict the order in which the sulfur concentrate and titanium concentrate are recovered; that is, this embodiment does not restrict the order in which S7-S8 and S9-S14 are performed. S7-S8 can be performed before or after S9-S14. This embodiment takes the example of S7-S8 being performed before S9-S14.

[0081] The results showed that, in the above-mentioned beneficiation methods, the yield of sulfur concentrate was 3.67%, the S grade was 33.28%, and the recovery rate was 81.43%; the yield of iron concentrate was 20.76%, the TFe grade was 60.75%, and the recovery rate was 58.25%, the S grade was 0.18%, and the recovery rate was 2.49%; and the yield of titanium concentrate was 7.48%, the TiO2 grade was 47.78%, and the recovery rate was 55.58%, the S grade was 0.31%, and the recovery rate was 1.55%.

[0082] Example 2

[0083] A mineral processing method for efficiently recovering valuable elements from high-sulfur vanadium-titanium magnetite is disclosed. The raw ore to be processed comes from a vanadium-titanium magnetite deposit in the Panxi region. Multiple chemical analyses show that the ore contains 28.65% TFe, 9.43% TiO2, and 0.75% S, classifying it as a high-sulfur vanadium-titanium magnetite. Figure 1 As shown, the mineral processing method includes:

[0084] S1. The raw ore is crushed and then ground using a ball mill to obtain beneficiated material; wherein, the weight percentage of minerals with a particle size of -0.074mm in the beneficiated material is 30%, that is, the fineness of the grinding is -0.074mm 30%;

[0085] S2. The beneficiation material is subjected to a first flotation to remove sulfur, yielding a first sulfur rough concentrate and a first sulfur tailings. The first flotation employs a first collector, a first modifier, and a first frother. The first collector is butyl xanthate, with a dosage of 300 g / t·feed. The first modifier consists of sulfuric acid and copper sulfate, with sulfuric acid at a dosage of 700 g / t·feed and copper sulfate at a dosage of 200 g / t·feed. The first frother is No. 2 oil, with a dosage of 50 g / t·feed.

[0086] S3. The first weak magnetic separation is performed on the first sulfur tailings to rough iron, resulting in iron rough concentrate and the first iron tailings; wherein, the magnetic field strength of the first weak magnetic separation is 111.4 KA / m;

[0087] S4. The iron concentrate is re-ground using a ball mill to obtain refractory iron concentrate; wherein the weight percentage of minerals with a particle size of -0.038mm in the refractory iron concentrate is 60%, that is, the fineness of the re-grinding is 60% -0.038mm.

[0088] S5. The regrinded iron concentrate is subjected to a second flotation to remove sulfur, yielding a second sulfur concentrate and a second sulfur tailings. The second flotation employs a second collector, a second modifier, and a second frother. The second collector is butyl xanthate, with a dosage of 300 g / t·feed. The second modifier consists of sulfuric acid and copper sulfate, with sulfuric acid at a dosage of 400 g / t·feed and copper sulfate at a dosage of 200 g / t·feed. The second frother is No. 2 oil, with a dosage of 50 g / t·feed.

[0089] S6. The second weak magnetic separation is performed on the second sulfur tailings to further refine the iron, resulting in iron concentrate and second iron tailings; wherein the magnetic field strength of the second weak magnetic separation is 95.5 kA / m;

[0090] S7. Combine the first sulfur crude concentrate with the second sulfur crude concentrate to obtain the third sulfur crude concentrate;

[0091] S8. Perform three blank cleaning processes on the third sulfur rough concentrate to obtain sulfur concentrate and sulfur tailings;

[0092] S9. Combine the first iron tailings and the second iron tailings to obtain titanium-selected material;

[0093] S10. The titanium-selected material is screened and classified to obtain oversize material with a particle size of +0.1mm and undersize material with a particle size of -0.1mm;

[0094] S11. The material on the screen is subjected to shaking table gravity separation to obtain the first pre-enriched titanium concentrate and the first pre-enriched tailings;

[0095] S12. The undersize material is subjected to strong magnetic separation to obtain the second pre-enriched titanium concentrate and the second pre-enriched tailings; wherein, the strong magnetic separation includes a roughing and a cleaning process, the magnetic field strength of the roughing process is 0.8T, and the magnetic field strength of the cleaning process is 0.6T.

[0096] S13. Combine the first pre-enriched titanium concentrate with the second pre-enriched titanium concentrate to obtain the third pre-enriched titanium concentrate;

[0097] S14. The third pre-enriched titanium concentrate is subjected to a third flotation to obtain titanium concentrate and titanium tailings. The third flotation includes a rougher, a scavenger, and a cleaner. The third flotation uses a third collector and a third modifier. The third collector is collector MOH, and the third modifier is sulfuric acid. In the first rougher, the amount of collector MOH is 2500 g / t·feed, and the amount of sulfuric acid is 2500 g / t·feed. In the first scavenger, the amount of collector MOH is 500 g / t·feed, and the amount of sulfuric acid is 500 g / t·feed. In the four cleaners, the amount of collector MOH is 200 g / t·feed in the first cleaner, and no collector MOH is used in the remaining three cleaners. The amounts of sulfuric acid are 500 g / t·feed, 300 g / t·feed, 200 g / t·feed, and 100 g / t·feed, respectively.

[0098] It should be noted that the purpose of S7-S8 is to recover sulfur concentrate, and the purpose of S9-S14 is to recover titanium concentrate. This embodiment does not restrict the order in which the sulfur concentrate and titanium concentrate are recovered; that is, this embodiment does not restrict the order in which S7-S8 and S9-S14 are performed. S7-S8 can be performed before or after S9-S14. This embodiment takes the example of S7-S8 being performed before S9-S14.

[0099] The results showed that, in the above-mentioned beneficiation methods, the yield of sulfur concentrate was 2.15%, the S grade was 29.15%, and the recovery rate was 83.56%; the yield of iron concentrate was 25.58%, the TFe grade was 61.56%, and the recovery rate was 54.96%, the S grade was 0.09%, and the recovery rate was 3.07%; and the yield of titanium concentrate was 10.48%, the TiO2 grade was 48.21%, and the recovery rate was 53.58%, the S grade was 0.15%, and the recovery rate was 2.10%.

[0100] Example 3

[0101] A mineral processing method for efficiently recovering valuable elements from high-sulfur vanadium-titanium magnetite is disclosed. The raw ore to be processed comes from a vanadium-titanium magnetite deposit in the Panxi region. Multiple chemical analyses show that the ore contains 24.32% TFe, 7.84% TiO2, and 1.05% S, classifying it as a high-sulfur vanadium-titanium magnetite. Figure 1 As shown, the mineral processing method includes:

[0102] S1. The raw ore is crushed and then ground using a ball mill to obtain beneficiated material; wherein, the weight percentage of minerals with a particle size of -0.074mm in the beneficiated material is 40%, that is, the fineness of grinding is -0.074mm 40%;

[0103] S2. The beneficiation material is subjected to a first flotation to remove sulfur, yielding a first sulfur rough concentrate and a first sulfur tailings. The first flotation employs a first collector, a first modifier, and a first frother. The first collector is butyl xanthate, with a dosage of 400 g / t·feed. The first modifier consists of sulfuric acid and copper sulfate, with sulfuric acid at a dosage of 900 g / t·feed and copper sulfate at a dosage of 300 g / t·feed. The first frother is No. 2 oil, with a dosage of 60 g / t·feed.

[0104] S3. The first weak magnetic separation is performed on the first sulfur tailings to rough iron, resulting in iron rough concentrate and the first iron tailings; wherein, the magnetic field strength of the first weak magnetic separation is 111.4 KA / m;

[0105] S4. The iron concentrate is re-ground using a ball mill to obtain refractory iron concentrate; wherein, the weight percentage of minerals with a particle size of -0.038mm in the refractory iron concentrate is 75%, that is, the fineness of the re-grinding is -0.038mm 75%.

[0106] S5. The regrinded iron concentrate is subjected to a second flotation to remove sulfur, yielding a second sulfur concentrate and a second sulfur tailings. The second flotation employs a second collector, a second modifier, and a second frother. The second collector is butyl xanthate, used at a dosage of 150 g / t·feed. The second modifier consists of sulfuric acid and copper sulfate, with sulfuric acid used at a dosage of 300 g / t·feed and copper sulfate used at a dosage of 150 g / t·feed. The second frother is No. 2 oil, used at a dosage of 40 g / t·feed.

[0107] S6. The second weak magnetic separation is performed on the second sulfur tailings to further refine the iron, resulting in iron concentrate and second iron tailings; wherein the magnetic field strength of the second weak magnetic separation is 95.5 kA / m;

[0108] S7. Combine the first sulfur crude concentrate with the second sulfur crude concentrate to obtain the third sulfur crude concentrate;

[0109] S8. Perform three blank cleaning processes on the third sulfur rough concentrate to obtain sulfur concentrate and sulfur tailings;

[0110] S9. Combine the first iron tailings and the second iron tailings to obtain titanium-selected material;

[0111] S10. The titanium-selected material is screened and classified to obtain oversize material with a particle size of +0.1mm and undersize material with a particle size of -0.1mm;

[0112] S11. The material on the screen is subjected to shaking table gravity separation to obtain the first pre-enriched titanium concentrate and the first pre-enriched tailings;

[0113] S12. The undersize material is subjected to strong magnetic separation to obtain the second pre-enriched titanium concentrate and the second pre-enriched tailings; wherein, the strong magnetic separation includes a roughing and a cleaning process, the magnetic field strength of the roughing process is 0.8T, and the magnetic field strength of the cleaning process is 0.6T.

[0114] S13. Combine the first pre-enriched titanium concentrate with the second pre-enriched titanium concentrate to obtain the third pre-enriched titanium concentrate;

[0115] S14. The third pre-enriched titanium concentrate is subjected to a third flotation to obtain titanium concentrate and titanium tailings. The third flotation includes a rougher, a scavenger, and a cleaner. The third flotation uses a third collector and a third modifier. The third collector is collector MOH, and the third modifier is sulfuric acid. In the first rougher, the amount of collector MOH is 2500 g / t·feed, and the amount of sulfuric acid is 2500 g / t·feed. In the first scavenger, the amount of collector MOH is 500 g / t·feed, and the amount of sulfuric acid is 500 g / t·feed. In the four cleaners, the amount of collector MOH is 200 g / t·feed in the first cleaner, and no collector MOH is used in the remaining three cleaners. The amounts of sulfuric acid are 500 g / t·feed, 300 g / t·feed, 200 g / t·feed, and 100 g / t·feed, respectively.

[0116] It should be noted that the purpose of S7-S8 is to recover sulfur concentrate, and the purpose of S9-S14 is to recover titanium concentrate. This embodiment does not restrict the order in which the sulfur concentrate and titanium concentrate are recovered; that is, this embodiment does not restrict the order in which S7-S8 and S9-S14 are performed. S7-S8 can be performed before or after S9-S14. This embodiment takes the example of S7-S8 being performed before S9-S14.

[0117] The results showed that, in the above-mentioned beneficiation methods, the yield of sulfur concentrate was 2.81%, the S grade was 30.29%, and the recovery rate was 81.06%; the yield of iron concentrate was 22.45%, the TFe grade was 60.89%, and the recovery rate was 56.21%, the S grade was 0.15%, and the recovery rate was 3.21%; and the yield of titanium concentrate was 8.73%, the TiO2 grade was 47.95%, the recovery rate was 53.39%, the S grade was 0.27%, and the recovery rate was 2.24%.

[0118] Compare with Example 1

[0119] The difference between Comparative Example 1 and Example 1 is as follows: 1) S2, S5, S7 and S8 are not included; 2) S3 is replaced by: performing a first weak magnetic separation on the beneficiated material to rough iron beneficiation, to obtain iron rough concentrate and first iron beneficiation tailings; 3) S6 is replaced by: performing a second weak magnetic separation on the regrinded iron rough concentrate to fine iron beneficiation, to obtain iron concentrate and second iron beneficiation tailings.

[0120] Other conditions, such as the selection of remaining reagents, the amount of remaining reagents, the remaining process flow, and the condition parameters, are the same as those in Example 1 of this disclosure (compared to Example 1, this comparative example did not perform the first flotation, the second flotation, and blank cleaning, in order to demonstrate that the mineral processing method of this disclosure is more effective).

[0121] The results showed that, in the above-mentioned beneficiation method, the yield of iron concentrate was 21.11%, the TFe grade was 59.25%, the recovery rate was 57.77%, the S grade was 0.48%, and the recovery rate was 6.76%; the yield of titanium concentrate was 7.23%, the TiO2 grade was 47.12%, the recovery rate was 52.98%, the S grade was 0.84%, and the recovery rate was 4.05%.

[0122] The results show that both the first and second flotation processes are sulfur removal processes. If the first and second flotation processes are not performed, the TFe grade and recovery rate in the iron concentrate and the TiO2 grade and recovery rate in the titanium concentrate will be reduced to some extent. However, since the S grade in the raw ore is very low, this has little impact on the yield, TiO2 grade and recovery rate of the iron and titanium concentrates. Nevertheless, it will still lead to an increase in the S grade and recovery rate in the iron and titanium concentrates, which will seriously affect the subsequent processing of the iron and titanium concentrates (e.g., smelting).

[0123] Compare with Example 2

[0124] The difference between Comparative Example 2 and Example 1 is as follows: 1) S2 and S7 are not included; 2) S3 is replaced by: performing a first weak magnetic separation on the beneficiated material to rough iron, obtaining iron rough concentrate and first iron tailings; 3) S8 is replaced by: performing three blank cleaning processes on the second sulfur rough concentrate to obtain sulfur concentrate and floating sulfur tailings.

[0125] Other conditions, such as the selection of remaining reagents, the amount of remaining reagents, the remaining process flow, and the condition parameters, are the same as those in Example 1 of this disclosure (this comparative example, compared to Example 1, does not perform the first flotation, which is used to demonstrate that the mineral processing method of this disclosure is more effective).

[0126] The results showed that, in the above-mentioned beneficiation methods, the yield of sulfur concentrate was 0.65%, the S grade was 32.85%, and the recovery rate was 14.24%; the yield of iron concentrate was 20.89%, the TFe grade was 60.25%, and the recovery rate was 58.13%, the S grade was 0.29%, and the recovery rate was 4.04%; the yield of titanium concentrate was 7.35%, the TiO2 grade was 47.13%, and the recovery rate was 53.87%, the S grade was 0.79%, and the recovery rate was 3.87%.

[0127] The results show that the first flotation is the main sulfur beneficiation process. Without the first flotation, not only will the grade of the sulfur concentrate decrease, but the yield and recovery rate of the sulfur concentrate will also decrease significantly.

[0128] Compare with Example 3

[0129] The difference between Comparative Example 3 and Example 1 is as follows: 1) S5 and S7 are not included; 2) S6 is replaced by: performing a second weak magnetic separation on the regrinded iron concentrate to refine the iron concentrate and obtain iron concentrate and second iron tailings; 3) S8 is replaced by: performing three blank refining processes on the first sulfur concentrate to obtain sulfur concentrate and floating sulfur tailings.

[0130] Other conditions, such as the selection of remaining reagents, the amount of remaining reagents, the remaining process flow, and the condition parameters, are the same as those in Example 1 of this disclosure (this comparative example, compared to Example 1, does not perform a second flotation, which is used to demonstrate that the mineral processing method of this disclosure is more effective).

[0131] The results showed that, in the above-mentioned beneficiation methods, the yield of sulfur concentrate was 3.03%, the S grade was 33.85%, and the recovery rate was 68.38%; the yield of iron concentrate was 20.58%, the TFe grade was 60.68%, and the recovery rate was 57.68%, the S grade was 0.21%, and the recovery rate was 2.88%; and the yield of titanium concentrate was 7.50%, the TiO2 grade was 47.69%, the recovery rate was 55.63%, the S grade was 0.32%, and the recovery rate was 1.60%.

[0132] The results show that the second flotation is used to recover the small amount of sulfide ore liberated from the regrinded iron concentrate. Without the second flotation, the yield and recovery rate of the sulfur concentrate would decrease. It should be noted that since the first flotation is the primary sulfur beneficiation process, its impact on the yield and recovery rate of the sulfur concentrate is significantly greater than that of the second flotation.

[0133] Therefore, the mineral processing method disclosed herein for efficiently recovering valuable elements from high-sulfur vanadium-titanium magnetite can not only effectively recover valuable elements such as iron, vanadium, titanium, cobalt, nickel, copper, and sulfur from high-sulfur vanadium-titanium magnetite to reduce resource waste, but also reduce SO2 emissions. In addition, it can improve the quality of iron concentrate and titanium concentrate, thereby achieving at least the effects of improving the comprehensive utilization rate of resources and energy conservation and emission reduction, and has good economic and environmental benefits.

[0134] The above description is merely a preferred embodiment of this disclosure. It should be understood that this disclosure is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of this disclosure should be within the protection scope of the appended claims.

Claims

1. A mineral processing method for efficiently recovering valuable elements from high-sulfur vanadium-titanium magnetite, characterized in that, include: The raw ore is crushed and ground sequentially to obtain beneficiated mineral materials; The beneficiation material is subjected to a first flotation to obtain a first sulfur rough concentrate and a first sulfur tailings. The first sulfur tailings were subjected to a first weak magnetic separation to obtain iron rough concentrate and the first iron tailings. The iron crude concentrate is further ground to obtain refractory iron crude concentrate; The refractory iron concentrate is subjected to a second flotation to obtain a second sulfur concentrate and a second sulfur tailings. The second sulfur tailings were subjected to a second weak magnetic separation to obtain iron concentrate and second iron tailings. The first sulfur crude concentrate and the second sulfur crude concentrate are combined to obtain the third sulfur crude concentrate; The third sulfur rough concentrate was subjected to blank cleaning to obtain sulfur concentrate and sulfur tailings; The first iron tailings and the second iron tailings are combined to obtain titanium-selected material; The selected titanium material is screened and classified to obtain oversize material and undersize material; The material over the screen is subjected to gravity separation to obtain a first pre-enriched titanium concentrate and a first pre-enriched tailings. The undersize material is subjected to strong magnetic separation to obtain a second pre-enriched titanium concentrate and a second pre-enriched tailings. The first pre-enriched titanium concentrate and the second pre-enriched titanium concentrate are combined to obtain a third pre-enriched titanium concentrate; and The third pre-enriched titanium concentrate is subjected to a third flotation to obtain titanium concentrate and titanium tailings.

2. The mineral processing method according to claim 1, characterized in that, The raw ore is the raw ore of the high-sulfur vanadium-titanium magnetite; wherein, the TFe grade is 18% to 30%, the TiO2 grade is 5% to 10%, and the S grade is 0.5% to 1.5%.

3. The mineral processing method according to claim 1, characterized in that, The weight percentage of minerals with a particle size of -0.074 mm in the mineral beneficiation material is 30% to 60%. And / or, the weight percentage of minerals with a particle size of -0.038 mm in the regrinded iron concentrate is 60% to 90%.

4. The mineral processing method according to claim 1, characterized in that, The first flotation process employs a first collector, a first modifier, and a first frother; wherein the first collector comprises butyl xanthate; the first modifier comprises sulfuric acid and copper sulfate; and the first frother comprises No. 2 oil. And / or, the second flotation employs a second collector, a second modifier, and a second frother; wherein the second collector comprises butyl xanthate; the second modifier comprises sulfuric acid and copper sulfate; and the second frother comprises No. 2 oil.

5. The mineral processing method according to claim 1, characterized in that, The magnetic field strength of the first weak magnetic separation is 111.4–143.28 kA / m; And / or, the magnetic field strength of the second weak magnetic selection is 79.6 to 95.5 kA / m.

6. The mineral processing method according to claim 1, characterized in that, The blank selection is performed at least three times.

7. The mineral processing method according to claim 1, characterized in that, The particle size of the material over the screen is +0.1 mm, and the particle size of the material under the screen is -0.1 mm. And / or, the reselection includes at least one of shaking table reselection and spiral chute reselection.

8. The mineral processing method according to claim 1 or 7, characterized in that, The strong magnetic separation includes at least one coarse separation and at least one fine separation; wherein the magnetic field strength of the coarse separation is 0.8 to 1.0 T; and the magnetic field strength of the fine separation is 0.6 to 0.8 T.

9. The mineral processing method according to claim 1, characterized in that, The third flotation process employs a third collector and a third modifier; wherein the third collector includes collector MOH; and the third modifier includes sulfuric acid.

10. The mineral processing method according to claim 1 or 9, characterized in that, The third flotation process includes at least one roughing process, at least one sweeping process, and at least four cleaning processes.

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