Method for comprehensive recovery of valuable components in humboldtite

Abstract

The application discloses a comprehensive recovery method of valuable components in boron-magnesio-iron ore, which comprises the following steps: (1) crushing the boron-magnesio-iron ore, preselecting and throwing tailings to obtain preselected concentrate and preselected tailings; (2) performing grinding and weak magnetic separation treatment on the preselected concentrate to obtain weak magnetic concentrate and weak magnetic tailings; (3) performing desulfurization and desilication treatment on the weak magnetic concentrate to obtain uranium-containing boron-iron mixed concentrate, sulfur concentrate and silicon-containing tailings; (4) performing rubbing and grinding treatment on the preselected tailings to obtain mica concentrate and magnesium-containing minerals; (5) mixing the weak magnetic tailings, the silicon-containing tailings and the magnesium-containing minerals, and performing flotation separation to obtain boron concentrate, serpentine concentrate, mica concentrate and uranium-containing tailings; (6) performing uranium selection treatment on the uranium-containing boron-iron mixed concentrate to obtain uranium concentrate and boron-iron-containing concentrate; and performing uranium selection treatment on the uranium-containing tailings to obtain uranium concentrate and tailings. The comprehensive recovery method of valuable components in boron-magnesio-iron ore realizes the recovery and utilization of multiple valuable components.

Description

Technical Field

[0001] This invention belongs to the field of mineral processing technology, and in particular relates to a method for recovering boron ore. Background Technology

[0002] Boron-magnesia ore is a mineral resource containing boron, magnesium, and iron, with wide applications in industrial production. It is primarily used to produce ferroborone alloys, molten iron treatment agents, and corrosion inhibitors. Ferroborone alloys are widely used in the power, metallurgical, and aerospace industries, possessing significant functional and economic value. However, the development and utilization of boron-magnesia ore still faces some challenges. Due to the relatively low content of boron, the main useful component in the ore, enterprises may not achieve good economic benefits if only the boron is utilized to produce boric acid. Therefore, the development and utilization of boron-magnesia ore must follow a comprehensive approach.

[0003] Due to the close symbiotic relationship, complex composition, and fine crystal size of iron, boron, and magnesium minerals in boron-magnesium ore, the separation of these three minerals is extremely difficult. The existing processing flow for boron-magnesium ore involves magnetic-gravity separation to obtain boron concentrate, boron-containing iron concentrate, and tailings. Approximately 40% of the B2O3 enters the boron concentrate, 30% enters the boron-containing iron concentrate, and the remaining 30% enters the tailings. This not only results in a huge waste of boron resources but also fails to fully utilize the magnesium-containing minerals and other valuable components in the ore. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies and defects mentioned in the background art above, and to provide a comprehensive recovery method for valuable components in boron-magnesium iron ore that can realize the comprehensive recovery and utilization of valuable components.

[0005] To solve the above-mentioned technical problems, the technical solution proposed by this invention is as follows:

[0006] A comprehensive method for recovering valuable components from boron-magnesium iron ore includes the following steps:

[0007] (1) The boron-magnesium iron ore is crushed and then pre-selected and tailings are discarded by weak magnetic separation to obtain pre-selected concentrate and pre-selected tailings;

[0008] (2) Grind the pre-selected concentrate obtained in step (1) and then perform weak magnetic separation to obtain weak magnetic concentrate and weak magnetic tailings.

[0009] (3) The weak magnetic concentrate obtained in step (2) is subjected to desulfurization and desiliconization treatment to obtain uranium-boron-iron mixed concentrate, sulfur concentrate and silicon-containing tailings;

[0010] (4) The pre-selected tailings obtained in step (1) are subjected to scrubbing and grinding to obtain mica concentrate and magnesium-containing minerals;

[0011] (5) Mix the weak magnetic tailings obtained in step (2), the silicon-containing tailings obtained in step (3), and the magnesium-containing minerals obtained in step (4), and perform flotation separation to obtain boron concentrate, serpentine concentrate, mica concentrate and uranium-containing tailings.

[0012] (6) The uranium-containing boron-iron mixed concentrate obtained in step (3) is subjected to uranium beneficiation to obtain uranium concentrate and boron-iron concentrate; the uranium-containing tailings in step (5) are subjected to uranium beneficiation to obtain uranium concentrate and tailings.

[0013] In the above-mentioned comprehensive recovery method, preferably, the boromagnesian ore contains magnetite, with an iron grade greater than 20%, and the mass percentage of magnetite in the iron phase (which includes all iron-bearing ores such as boromagnesian ore, magnesian ore, pyrrhotite, and pyrite) is greater than 75%. The boromagnesian ore also contains one or more of the following: boromagnesian ore, magnesian ore, pyrrhotite, pyrite, boromagnesite, serpentine, mica, and crystalline uranium ore.

[0014] In the above-mentioned comprehensive recovery method, preferably, in step (1), the boron-magnesium iron ore is crushed to a particle size of less than 3 mm, and then subjected to dry weak magnetic separation treatment, wherein the magnetic separation intensity of the dry weak magnetic separation treatment is 1000-2500 Os.

[0015] In step (1), the iron in boromagnesian ore mainly exists in the form of magnetite. Most other minerals are non-magnetic or weakly magnetic, and may contain one or more iron minerals such as boroferrite, magnesian ore, pyrrhotite, and pyrite. The remaining majority of minerals are one or more valuable minerals such as boromagnesite, serpentine, mica, and crystalline uranium ore. In step (1), the iron grade of boromagnesian ore is low, and the ore is mainly magnetite. Therefore, boromagnesian ore needs to be crushed to a suitable particle size and pre-enriched by magnetic separation at different particle sizes to improve the iron grade and reduce the energy consumption of subsequent grinding. Specifically, the ore sample is crushed to -3mm, pre-selected, and tailings are discarded to obtain pre-selected concentrate and pre-selected tailings.

[0016] In the above-mentioned comprehensive recovery method, preferably, in step (2), when grinding the pre-selected concentrate (using a rod mill), the ore sample is ground until the mass percentage of particles with a diameter of less than 0.075 mm reaches 35-55%, and the magnetic separation intensity during weak magnetic separation is 1000-2500 Os.

[0017] After the above processing, the weak magnetic concentrate obtained in step (2) has an iron grade of 43-50%, a sulfur content of 0.6-1.5%, and a SiO2 content of 5-10%. The weak magnetic concentrate has excessive sulfur and high silicon content. Therefore, it is necessary to perform desulfurization and desiliconization flotation treatment on the weak magnetic concentrate to obtain uranium-boron-iron mixed concentrate, sulfur concentrate, and silicon-containing tailings.

[0018] In the above-mentioned comprehensive recovery method, preferably, in step (3), based on the particle size relationship between sulfur-containing minerals and silicon-containing minerals, it is determined that the ore at this particle size needs further liberation. First, the weak magnetic concentrate is ground until the mass proportion of particles smaller than 0.045mm reaches 85-95%, and then desilication and desulfurization are carried out by flotation. During flotation, the feed particle size is determined according to the specific situation to obtain sulfur concentrate and silicon-containing minerals with higher purity, and the grade of iron concentrate is further improved.

[0019] In the above-mentioned comprehensive recovery method, preferably, in step (4), the mica concentrate is in the form of flakes, and the mica concentrate obtained from the scrubbing and grinding process, along with magnesium-containing minerals, is separated by a shaking table. Due to its layered structure, mica is not easily ground finely under the scrubbing and grinding process, while minerals such as serpentine and borosilicate are easily ground and dissociated. After the scrubbing and grinding process, large pieces of mica and magnesium-containing minerals are obtained, and then the large pieces of mica concentrate are recovered through a coarse and fine classification process. Specifically, in step (4), the coarse and fine classification recovery utilizes the different properties between minerals to determine the processing and sorting process. The density of mica is 2.70-3.10 g / cm³. 3 The density of serpentine is 2.57 g / cm³. 3 The density of boromagnesite is 2.62-2.75 g / cm³. 3 Quartz has a density of 2.65 g / cm³. 3 The density of feldspar is 2.6-2.76 g / cm³. 3 While their densities are similar, mica is flaky while other minerals are granular. The movement of flaky mica in the liquid differs from that of granular minerals, resulting in zoning zones during shaking table separation. This allows for the separation of mica from serpentine, borosilicate, quartz, and feldspar. The large mica concentrate obtained in step (4) can be sold as a product. The magnesium-containing minerals mainly refer to borosilicate, serpentine, and mica. After scrubbing and grinding, the magnesium-containing minerals meet the flotation particle size requirements.

[0020] In the above-mentioned comprehensive recovery method, preferably, in step (5), the collector used in the flotation separation is a mixed fatty acid containing hydroxyoxime groups. The preparation method of the mixed fatty acid containing hydroxyoxime groups includes the following steps: the mixed fatty acid is reacted with methanol under the catalysis of concentrated sulfuric acid to generate fatty acid methyl ester, the fatty acid methyl ester is reacted with hydroxylamine hydrochloride and sodium hydroxide, and then acidified to obtain the mixed fatty acid containing hydroxyoxime groups. This invention utilizes the bonding mechanism between the multipolar groups in the hydroxyoxime-containing mixed fatty acid collector molecule and Mg particles to test the efficient separation of magnesium-containing minerals, and conducts flotation tests according to different magnesium ion sites. The tiered separation of magnesium-containing minerals is achieved by studying the bonding mechanism between the multipolar groups in the collector molecule and Mg particles, and by using the mixed fatty acid collector containing hydroxyoxime groups to regulate the differences in Mg-O and Si-O surface / interface properties between minerals, ultimately obtaining boron concentrate, serpentine concentrate, fine-grained mica concentrate, and a small amount of uranium-containing tailings.

[0021] In addition, in step (5) of the present invention, the weak magnetic tailings obtained in step (2), the silicon-containing tailings obtained in step (3) and the magnesium-containing minerals obtained in step (4) are mixed and separated by flotation. The substances obtained in the above steps have a synergistic effect, and the mixing is beneficial to improving the flotation effect. The minerals obtained in steps (2), (3), and (4) all contain some boromagnesite, serpentine, and mica. The obtained minerals have common raw material properties but different contents. Single flotation of the minerals obtained in a certain step has problems such as low flotation feed, complicated process, and high cost (the content of a certain component of boromagnesite, serpentine, and mica in a certain mineral is low, so it has value for flotation alone, and it would be a waste if it is not flotated). Combining the three will not only not affect the properties of the mineral sample, but can also overcome the drawbacks of single flotation. In addition, boromagnesite, serpentine, and mica are all magnesium ion-containing minerals, which is conducive to the screening of flotation reagents and facilitates the subsequent flotation separation of the three minerals, which is conducive to improving the flotation effect. Through flotation, boron concentrate, serpentine concentrate, mica concentrate, and uranium-containing tailings can be obtained.

[0022] In the above-mentioned comprehensive recovery method, preferably, in step (6), when the uranium-containing boron-iron mixed concentrate is subjected to uranium beneficiation, a Nelson KCVD-6 centrifugal concentrator is first used to beneficiate the uranium crude concentrate and the boron-iron concentrate. The uranium crude concentrate is further ground and gravity separated to obtain uranium concentrate and uranium ore tailings. The uranium ore tailings are returned to the uranium-containing boron-iron mixed concentrate. The optimal grinding fineness of the uranium-containing boron-iron mixed concentrate is determined according to the particle size and intercalation relationship of the crystalline uranium ore. Based on the high specific gravity of uranium ore, gravity separation is used to obtain high-grade uranium concentrate and qualified boron-iron concentrate products.

[0023] In the above-mentioned comprehensive recovery method, preferably, in step (6), when uranium-bearing tailings are subjected to uranium beneficiation, a Nelson KCVD-6 centrifugal concentrator is first used to beneficiate uranium rough concentrate and tailings. The uranium rough concentrate is further ground and subjected to gravity separation to obtain uranium concentrate and uranium ore beneficiated tailings. The uranium ore beneficiated tailings are sent to the tailings. The uranium-bearing tailings themselves have a relatively fine particle size and can be directly subjected to gravity separation to extract uranium, obtaining high-quality uranium concentrate and tailings. Since the uranium content in the original ore is extremely low, the uranium content in the tailings after efficient uranium beneficiation is far below the safety threshold. The tailings can be sold externally or used to make building materials. This process realizes the efficient development of boron-magnesium iron ore resources, the full comprehensive recovery and utilization of valuable components, and the goal of tailings-free operation in the mining development and utilization process.

[0024] The comprehensive recovery method for valuable components in the aforementioned boron-magnesium iron ore may specifically include the following steps:

[0025] (1) Crushing and pre-enrichment: The boron-magnesium iron ore is crushed into crushed samples by coarse crushing and medium crushing. The crushed samples are screened according to the preset particle size. The oversize portion is returned to the crushing system for further crushing, and the undersize portion is entered into the classification operation to finally obtain -3mm fine-grained ore. The obtained -3mm fine-grained ore is pre-enriched and subjected to wet or dry weak magnetic separation to obtain pre-selected concentrate and pre-selected tailings.

[0026] (2) Grinding and magnetic separation: The pre-selected concentrate obtained in step (1) is subjected to grinding and magnetic separation test. The pre-selected concentrate is ground by rod mill and magnetic separation test is carried out to obtain weak magnetic concentrate and weak magnetic tailings.

[0027] (3) Desulfurization and desiliconization: The weak magnetic concentrate obtained in step (2) has an iron grade of 43-50% and a sulfur content of 0.6-1.5%. The weak magnetic concentrate exhibits the characteristics of low iron, high sulfur and high silicon. After grinding-flotation desulfurization and desiliconization, uranium-boron-iron mixed concentrate, sulfur concentrate and silicon-containing tailings are obtained.

[0028] (4) High-efficiency uranium beneficiation: After removing sulfur-containing and silicon-containing minerals by flotation in step (3), a uranium-containing boron-iron mixed concentrate is obtained. Based on the high specific gravity of uranium ore, gravity separation is carried out to obtain uranium crude concentrate and boron-iron concentrate. Based on the quality of uranium crude concentrate and its degree of liberation, further grinding-gravity separation is carried out to obtain high-quality crystalline uranium ore. The tailings of the uranium ore beneficiation are returned to the uranium-containing boron-iron mixed concentrate, thereby achieving high-efficiency uranium beneficiation.

[0029] (5) Coarse and fine classification and recovery: Analysis of the pre-selected tailings obtained in step (1) shows that it contains a large amount of mica minerals. The remaining gangue minerals are mainly serpentine, borosilicate, feldspar and chlorite, which are easily ground and mud-forming minerals. Based on the layered structure of mica, which is not easily mud-forming under scrubbing and grinding process, large areas of mica and magnesium-containing minerals are obtained through scrubbing and grinding process. Then, large areas of mica concentrate are recovered through coarse and fine classification process.

[0030] (6) Cascade separation of magnesium-bearing minerals: The weak magnetic tailings obtained in step (2), the silicon-bearing tailings obtained in step (3), and the magnesium-bearing minerals obtained in step (5) are combined and separated by flotation to finally obtain boron concentrate, serpentine concentrate, fine-grained mica concentrate and a small amount of uranium-bearing tailings.

[0031] (7) High-efficiency uranium beneficiation: The uranium-bearing tailings obtained in step (6) are subjected to gravity separation to obtain uranium rough concentrate and tailings. Based on the quality of the uranium rough concentrate and its degree of liberation, further grinding-gravity separation is carried out to obtain high-quality crystalline uranium ore. The uranium ore beneficiation tailings are returned to the tailings, thereby achieving high-efficiency uranium beneficiation. Since the uranium content in the original ore is extremely low, the uranium content in the tailings after high-efficiency uranium beneficiation is far below the safety threshold. The tailings can be used as cement raw material additives, environmentally friendly ecological blocks, sold externally or made into building materials, etc., to achieve efficient development of boron-magnesium iron ore resources.

[0032] Existing processing techniques for boron-magnesium iron ore involve magnetic-gravity separation to obtain boron concentrate, boron-iron concentrate, and tailings. However, valuable components in the tailings are not fully utilized, trace amounts of uranium ore in the boron-iron concentrate are not effectively extracted, and magnesium-bearing minerals are not efficiently separated. This invention presents a comprehensive recovery method for valuable components in boron-magnesium iron ore, optimizing the recovery process to solve these problems, achieving the recovery and utilization of multiple valuable components, and obtaining better technical indicators.

[0033] Compared with the prior art, the advantages of the present invention are as follows:

[0034] 1. The comprehensive recovery method for valuable components in boron-magnesium iron ore of the present invention is based on the physicochemical properties of the minerals for sorting. Iron beneficiation is the dominant process in boron-magnesium iron ore. The method focuses on iron beneficiation to achieve the recovery and utilization of valuable components and to continuously enrich the iron ore. Based on the particle size distribution of minerals in the ore, other minerals that are easily liberated from iron ore are preferentially discarded. Sulfur-containing, silicon-containing, and uranium-containing minerals that are difficult to liberate from iron ore are determined to be preferentially floated based on the particle size and physicochemical properties of the ore. The remaining iron and uranium minerals are separated by gravity separation based on their large difference in specific gravity.

[0035] 2. The comprehensive recovery method for valuable components in boron-magnesium iron ore of the present invention contains large areas of mica in the pre-selected tailings ore. Due to its layered structure, effective scrubbing and grinding processes can achieve the dissociation of large areas of mica from other minerals. In the entire process, all magnesium- and silicon-containing minerals are treated by the above-mentioned process, and the minerals are well dissociated. After mixing, flotation can be used to separate boron-magnesium ore, serpentine, fine-grained mica, and uranium-containing tailings.

[0036] 3. The comprehensive recovery method of valuable components in boron-magnesium iron ore of the present invention can efficiently recover the main minerals in low-grade iron ore, and also comprehensively recover associated valuable components to obtain products such as iron concentrate, boron concentrate, sulfur concentrate, serpentine concentrate, large-area mica concentrate, fine-grained mica concentrate and uranium concentrate, thus realizing the cascade recovery of valuable components.

[0037] 4. The comprehensive recovery method of valuable components in boron-magnesium iron ore of the present invention improves the quality of tailings after the valuable components are recovered in stages, as brittle minerals such as mica and serpentine are removed. The tailings have a wide range of uses and can be used as raw materials for refractory materials, ecological blocks, cement or building materials, realizing tailings-free production and solving the problems of environmental pollution and geological disasters caused by tailings ponds and spoil heaps at the source. Attached Figure Description

[0038] 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 some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a process flow diagram of the comprehensive recovery method for valuable components in boron-magnesium iron ore according to the present invention.

[0040] Figure 2 The image shows a BSE backscattered electron image of the boromagnesite ore in Example 1 (M-magnetite, Vo-boronite, Sz-boronite, Pl-platy phlogopite, Ur-crystalline uraniumite, Ph-pyrrhotite). Detailed Implementation

[0041] To facilitate understanding of the present invention, the present invention will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of protection of the present invention is not limited to the following specific embodiments.

[0042] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of the invention.

[0043] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this invention can be purchased from the market or prepared by existing methods.

[0044] Example 1:

[0045] The chemical multi-element analysis, iron phase analysis, and mineral composition analysis results of the boron-magnesium iron ore used in this embodiment are shown in Tables 1, 2, and 3, respectively. The microstructure of the ore is as follows: Figure 2 As shown.

[0046] Table 1: Results of Multi-Element Chemical Analysis of Raw Ore / %

[0047] content 28.26 5.81 0.84 22.54 21.69 1.98 0.77 0.70 Components P S U <![CDATA[TiO2]]> MnO BaO C Burnout content 0.041 1.06 76g / t 0.12 0.09 0.013 0.59 6.14

[0048] Table 2: Phase Analysis Results of Raw Iron Ore / %

[0049]

[0050] Table 3: Content of major minerals in ore / %

[0051]

[0052] The valuable elements or components available for beneficiation and recovery in the ore are Fe, B2O3, MgO, and U, with contents of 28.26%, 5.81%, 22.54%, and 76 g / t, respectively. The raw ore has a low iron grade and is mainly composed of magnetite. Pre-selection (magnetic separation) and tailings removal are used to improve the iron grade. The ore has a fine particle size distribution, with magnesium-bearing minerals such as borosilicate, serpentine, and mica tightly embedded, but the magnesium ion sites differ. Appropriate flotation reagents are determined to achieve efficient separation of magnesium-bearing minerals. Uranium ore is subjected to gravity separation due to its high specific gravity. Therefore, for complex ores with many valuable components, a cascade recovery process for valuable components is crucial.

[0053] The comprehensive recovery method for valuable components in boron-magnesium iron ore in this embodiment has the following process flow diagram: Figure 1 As shown, it includes the following steps:

[0054] S1. Crushing and Pre-enrichment: The boron-magnesium iron ore has a large particle size and the iron is mainly composed of magnetite. Therefore, the pre-selection process is determined to be weak magnetic separation and tailings removal. The raw ore is coarsely crushed to below 25mm and medium crushed to below -12mm to obtain crushed samples. The medium crushed product is crushed to -3mm. The crushed samples are screened using a -3mm vibrating screen. The oversize portion is returned to the crushing system for further crushing, and the undersize portion is used for classification to finally obtain -3mm fine-grained ore. The obtained -3mm fine-grained ore is pre-enriched and then subjected to weak magnetic separation and tailings removal at a magnetic separation intensity of 2000Os to obtain pre-selected concentrate and pre-selected tailings.

[0055] S2. Grinding and magnetic separation: The pre-selected concentrate obtained in step S1 is subjected to grinding and magnetic separation test. The rod mill is used for grinding for 5 minutes, and the grinding fineness is -0.075mm, accounting for 45.78%. The magnetic separation intensity is 2000 Os, and weak magnetic concentrate and weak magnetic tailings are obtained.

[0056] S3. Desulfurization and Desiliconization: The weak magnetic concentrate obtained in step S2 has an iron grade of 47.15%, a sulfur content of 0.93%, and a SiO2 content of 6.48%. The weak magnetic concentrate has high sulfur and silicon content. It undergoes grinding-flotation treatment, with the particle size of the ore sample after grinding reaching -0.045 mm in 90.36%. In the flotation process, a mixed reagent composed of starch, etheramine, and sodium dodecyl sulfonate is used for flotation (flotation of silicon and sulfur). Amyl xanthate and No. 2 oil are added for further flotation, resulting in sulfur concentrate 1. In the flotation cell, water glass and sodium hexametaphosphate dispersant are added to the iron concentrate for slurry preparation, followed by the addition of amyl xanthate and No. 2 oil for scavenging experiments. Flotation yields sulfur concentrate and a mixed concentrate containing uranium-boron-iron. Harmful impurities, including sulfur and silicon, are removed, resulting in a mixed concentrate containing uranium-boron-iron, a sulfur concentrate, and silicon-containing tailings.

[0057] S4. High-efficiency uranium beneficiation: Based on the high specific gravity of uranium ore, the uranium-boron-iron mixed concentrate obtained in step S3 was beneficiated using a Nelson KCVD-6 centrifugal concentrator. The centrifugal force was adjusted to 90g, the fluidizing water flow rate to 34L / min, and the feed flow rate was controlled at 2m³ / min. 3 At a feed concentration of 20% and a tightening valve closing time of 10s, a gravity separation vortex overflow test was conducted to obtain uranium rough concentrate and boron-iron concentrate. The uranium rough concentrate was further ground and gravity separated to obtain high-quality crystalline uranium ore and uranium ore tailings. The uranium ore tailings were returned to the uranium-boron-iron mixed concentrate, thereby achieving efficient uranium beneficiation.

[0058] S5. Coarse and Fine Grading and Recovery: Analysis of the pre-selected tailings obtained in step S1 shows that it contains a large amount of mica ore. The remaining gangue minerals are mainly serpentine, borosilicate, and chlorite, which are easily ground and become muddy. Based on the layered structure of mica, which is not easily muddy under scrubbing and grinding processes, some large mica ore is separated from other minerals through scrubbing and grinding. The movement mode of the separated flaky mica in the liquid is different from that of granular minerals. During shaking table separation, the feed concentration is 25%, thereby achieving the separation of large mica ore from serpentine, borosilicate, quartz, and feldspar, and realizing the recovery of large mica concentrate.

[0059] S6. Magnesium-bearing mineral cascade separation: The weakly magnetic tailings obtained in step S2, the silicon-bearing tailings obtained in step S3, and the magnesium-bearing minerals obtained in step S5 are combined and floated using mixed fatty acids containing hydroxyoxime groups. The bonding mechanism between the multipolar groups in the collector and Mg particles is used to test the efficient separation of magnesium-bearing minerals, ultimately obtaining boron concentrate, serpentine concentrate, fine-grained mica concentrate, and a small amount of uranium-bearing tailings. The mixed fatty acids containing hydroxyoxime groups are prepared by the following method: the mixed fatty acids react with methanol in the presence of concentrated sulfuric acid as a catalyst to first form fatty acid methyl esters, then react with hydroxylamine hydrochloride and sodium hydroxide under certain conditions, and finally acidify to obtain the mixed fatty acids containing hydroxyoxime groups.

[0060] S7. High-efficiency uranium beneficiation: The uranium-bearing tailings obtained in step S6 were subjected to a beneficiation test using a Nelson KCVD-6 centrifugal concentrator. The centrifugal force was adjusted to 60g, the fluidizing water flow rate was 27L / min, and the feed flow rate was controlled at 2m³ / min. 3At a feed concentration of 6.82% and a valve closing time of 5 seconds, a gravity separation vortex separation test was conducted to obtain uranium rough concentrate and tailings. The uranium rough concentrate was further ground and gravity separated to obtain high-quality crystalline uranium ore and uranium ore tailings. The uranium ore tailings were returned to the tailings, thus achieving efficient uranium beneficiation. Due to the extremely low uranium content in the original ore, the uranium content in the tailings after efficient uranium beneficiation is not only far below the safety threshold, but the tailings also contain only small amounts of brittle mica, serpentine, and other minerals, making the tailings suitable for large-scale disposal as cement raw material additives, environmentally friendly building blocks, for sale, or for making building materials.

[0061] This embodiment yielded a boron-iron concentrate with an iron content of 61.97% and a recovery rate of 89.52%, a boron concentrate with a B2O3 content of 17.53% and a recovery rate of 60.14%, and a uranium concentrate with a U content of 0.1313% and a recovery rate of 69.36%. Approximately 30% of the B2O3 was incorporated into the boron-iron concentrate, and the boron in this portion was used as a valuable component. By calculating the MgO content in boromagnesite, serpentine, iron concentrate, and mica concentrate, the MgO recovery rate was determined to be 67.84%. The remaining tailings were disposed of in large quantities as ecological blocks, cement, or building materials.

[0062] Example 2:

[0063] The experiment was conducted using the raw ore from Example 1, and the resulting process parameters differed. The specific parameters and procedures included the following steps:

[0064] S1. Crushing and Pre-enrichment: The boron-magnesium iron ore has a large particle size and the iron is mainly composed of magnetite. Therefore, the pre-selection process is determined to be weak magnetic separation and tailings removal. The raw ore is coarsely crushed to below 25mm and medium crushed to below -12mm to obtain crushed samples. The medium crushed product is crushed to -3mm. The crushed samples are screened using a -3mm vibrating screen. The oversize portion is returned to the crushing system for further crushing, and the undersize portion is used for classification to finally obtain -3mm fine-grained ore. The obtained -3mm fine-grained ore is pre-enriched and then subjected to weak magnetic separation and tailings removal at a magnetic separation intensity of 2000Os to obtain pre-selected concentrate and pre-selected tailings.

[0065] S2. Grinding and magnetic separation: The pre-selected concentrate obtained in step S1 is subjected to grinding and magnetic separation test. The rod mill is used for grinding for 5 minutes, and the grinding fineness is -0.075mm, accounting for 47.36%. The magnetic separation intensity is 2000Os, and weak magnetic concentrate and weak magnetic tailings are obtained.

[0066] S3. Desulfurization and Desiliconization: The weak magnetic concentrate obtained in step S2 has an iron grade of 46.06%, a sulfur content of 1.21%, and a SiO2 content of 7.19%. The weak magnetic concentrate has high sulfur and silicon content. It undergoes grinding-flotation treatment, with the post-grinding sample achieving a particle size of -0.045 mm, accounting for 91.29%. In the flotation process, a mixed reagent composed of starch, etheramine, and sodium dodecyl sulfonate is used for silica flotation experiments. Amyl xanthate and No. 2 oil are added for flotation, resulting in sulfur concentrate 1. In the flotation cell, water glass and sodium hexametaphosphate dispersant are added to the iron concentrate for slurry preparation, followed by the addition of amyl xanthate and No. 2 oil for scavenging experiments, yielding sulfur concentrate 2 and a mixed concentrate containing uranium-boron-iron. Harmful impurities, including sulfur and silicon minerals, are removed, resulting in a mixed concentrate containing uranium-boron-iron, a sulfur concentrate, and silicon-containing tailings.

[0067] S4. High-efficiency uranium beneficiation: Based on the high specific gravity of uranium ore, the uranium-boron-iron mixed concentrate obtained in step S3 was beneficiated using a Nelson KCVD-6 centrifugal concentrator. The centrifugal force was adjusted to 90g, the fluidizing water flow rate to 34L / min, and the feed flow rate was controlled at 2m³ / min. 3 At a feed concentration of 20% and a tightening valve closing time of 10s, a gravity separation vortex overflow test was conducted to obtain uranium rough concentrate and boron-iron concentrate. The uranium rough concentrate was further ground and gravity separated to obtain high-quality crystalline uranium ore and uranium ore tailings. The uranium ore tailings were returned to the uranium-boron-iron mixed concentrate, thereby achieving efficient uranium beneficiation.

[0068] S5. Coarse and Fine Grading and Recovery: Analysis of the pre-selected tailings obtained in step S1 shows that it contains a large amount of mica ore. The remaining gangue minerals are mainly serpentine, borosilicate, and chlorite, which are easily ground and become muddy. Based on the layered structure of mica, which is not easily muddy under scrubbing and grinding processes, some large mica ore is separated from other minerals through scrubbing and grinding. The movement mode of the separated flaky mica in the liquid is different from that of granular minerals. During shaking table separation, the feed concentration is 25%, thereby achieving the separation of large mica ore from serpentine, borosilicate, quartz, and feldspar, and realizing the recovery of large mica concentrate.

[0069] S6. Magnesium-bearing mineral cascade separation: The weakly magnetic tailings obtained in step S2, the silicon-bearing tailings obtained in step S3, and the magnesium-bearing minerals obtained in step S5 are combined and floated using mixed fatty acids containing hydroxyoxime groups. The bonding mechanism between the multipolar groups in the collector and Mg particles is used to test the efficient separation of magnesium-bearing minerals, ultimately obtaining boron concentrate, serpentine concentrate, fine-grained mica concentrate, and a small amount of uranium-bearing tailings. The mixed fatty acids containing hydroxyoxime groups are prepared by the following method: the mixed fatty acids react with methanol in the presence of concentrated sulfuric acid as a catalyst to first form fatty acid methyl esters, then react with hydroxylamine hydrochloride and sodium hydroxide under certain conditions, and finally acidify to obtain the mixed fatty acids containing hydroxyoxime groups.

[0070] S7. High-efficiency uranium beneficiation: The uranium-bearing tailings obtained in step S6 were subjected to a beneficiation test using a Nelson KCVD-6 centrifugal concentrator. The centrifugal force was adjusted to 60g, the fluidizing water flow rate was 27L / min, and the feed flow rate was controlled at 2m³ / min. 3 At a feed concentration of 6.82% and a valve closing time of 5 seconds, a gravity separation vortex separation test was conducted to obtain uranium rough concentrate and tailings. The uranium rough concentrate was further ground and gravity separated to obtain high-quality crystalline uranium ore and uranium ore tailings. The uranium ore tailings were returned to the tailings, thus achieving efficient uranium beneficiation. Due to the extremely low uranium content in the original ore, the uranium content in the tailings after efficient uranium beneficiation is not only far below the safety threshold, but the tailings also contain only small amounts of brittle mica, serpentine, and other minerals, making the tailings suitable for large-scale disposal as cement raw material additives, environmentally friendly building blocks, for sale, or for making building materials.

[0071] This embodiment yielded a boron-containing iron concentrate with an iron grade of 60.35% and a recovery rate of 87.52%, a boron concentrate with a B2O3 content of 17.23% and a recovery rate of 60.84%, and a uranium concentrate with a U content of 0.1205% and a recovery rate of 65.36%. Approximately 30% of the B2O3 was incorporated into the boron-containing iron concentrate, and the boron in this portion of the concentrate was used as a valuable component. By calculating the MgO content in boromagnesite, serpentine, iron concentrate, and mica concentrate, the MgO recovery rate was determined to be 67.14%.

Claims

1. A comprehensive method for recovering valuable components from boron-magnesium iron ore, characterized in that, Includes the following steps: (1) The boron-magnesium iron ore is crushed and then subjected to pre-selection and tailings disposal using weak magnetic separation to obtain pre-selected concentrate and pre-selected tailings; (2) Grind the pre-selected concentrate obtained in step (1), and then perform weak magnetic separation to obtain weak magnetic concentrate and weak magnetic tailings. (3) The weak magnetic concentrate obtained in step (2) is subjected to desulfurization and desiliconization treatment to obtain uranium-boron-iron mixed concentrate, sulfur concentrate and silicon-containing tailings; (4) The pre-selected tailings obtained in step (1) are subjected to scrubbing and grinding to obtain mica concentrate and magnesium-containing minerals; (5) Mix the weak magnetic tailings obtained in step (2), the silicon-containing tailings obtained in step (3), and the magnesium-containing minerals obtained in step (4), and perform flotation separation to obtain boron concentrate, serpentine concentrate, mica concentrate and uranium-containing tailings. (6) The uranium-containing boron-iron mixed concentrate obtained in step (3) is subjected to uranium beneficiation to obtain uranium concentrate and boron-iron concentrate; the uranium-containing tailings in step (5) are subjected to uranium beneficiation to obtain uranium concentrate and tailings. In step (3), the weak magnetic concentrate is first ground until the mass ratio of particles smaller than 0.045 mm reaches 85-95%, and then desiliconization and desulfurization are carried out by flotation. In step (5), the collector used in the flotation separation is a mixed fatty acid containing hydroxyoxime. The preparation method of the mixed fatty acid containing hydroxyoxime includes the following steps: the mixed fatty acid and methanol are reacted with concentrated sulfuric acid to generate fatty acid methyl ester, the fatty acid methyl ester is reacted with hydroxylamine hydrochloride and sodium hydroxide, and then acidified to obtain the mixed fatty acid containing hydroxyoxime.

2. The comprehensive recycling method according to claim 1, characterized in that, The boromagnesian iron ore contains magnetite, with an iron grade greater than 20%, and the mass percentage of magnetite in the iron phase is greater than 75%. The boromagnesian iron ore also contains one or more of the following: boronite, magnesian iron ore, pyrrhotite, pyrite, boromagnesite, serpentine, mica, and crystalline uranium ore.

3. The comprehensive recycling method according to claim 1, characterized in that, In step (1), the boron-magnesium iron ore is crushed to a particle size of less than 3 mm and then subjected to dry weak magnetic separation. The magnetic separation intensity of the dry weak magnetic separation is 1000-2500 Os.

4. The comprehensive recycling method according to claim 1, characterized in that, In step (2), when grinding the pre-selected concentrate, the ore sample is ground until the mass percentage of particles smaller than 0.075 mm reaches 35-55%, and the magnetic separation intensity is 1000-2500 Os during weak magnetic separation treatment.

5. The comprehensive recycling method according to claim 1, characterized in that, In step (4), the mica concentrate is in the form of flakes, and the mica concentrate obtained by scrubbing and grinding and the magnesium-containing minerals are separated by shaking table separation.

6. The comprehensive recycling method according to any one of claims 1-5, characterized in that, In step (6), when the uranium-containing boron-iron mixed concentrate is subjected to uranium beneficiation, a centrifugal concentrator is first used to beneficiate the uranium crude concentrate and the boron-iron concentrate. The uranium crude concentrate is further ground and gravity separated to obtain uranium concentrate and uranium ore beneficiation tailings. The uranium ore beneficiation tailings are returned to the uranium-containing boron-iron mixed concentrate.

7. The comprehensive recycling method according to any one of claims 1-5, characterized in that, In step (6), when uranium-containing tailings are subjected to uranium beneficiation, centrifugal concentrators are first used to beneficiate uranium crude concentrate and tailings. The uranium crude concentrate is further ground and gravity separated to obtain uranium concentrate and uranium ore beneficiated tailings. The uranium ore beneficiated tailings are sent to the tailings.

Images