36results about "High gradient magnetic separation" patented technology

The invention relates to the technical field of quartz sand purification, in particular to a high-purity quartz sand purification method and equipment. 2, a magnetic separation stage; 3, an acid leaching stage; 4, an ultrasonic-assisted cleaning stage; 5, a high-temperature chlorination treatment stage; according to the quartz sand purification method, various impurities such as magnetic impurities, non-magnetic metal impurities and silicate impurities in the quartz sand can be deeply removed through the synergistic effect of multiple steps such as pretreatment, magnetic separation, acid leaching, ultrasonic-assisted cleaning and high-temperature chlorination treatment, the purity of the quartz sand reaches 99.999% or above, the strict requirements of high-end fields such as semiconductors and photovoltaics are met, and the method is suitable for industrial production. The purification steps are closely linked to form a modular purification process, and meanwhile, advanced technologies such as ultrasonic-assisted cleaning and high-temperature chlorination treatment are adopted, so that the impurity removal efficiency is remarkably improved, the purification time is shortened, and the energy consumption and the use amount of chemical reagents are reduced by optimizing the process and equipment.

The invention relates to the technical field of ore separation, and discloses a multi-stage photoelectric-jigging-magnetic separation synergistic efficient ore separation process which comprises the following steps: A, material pretreatment and particle size regulation and control: raw ore raw materials are treated through crushing and screening equipment; the method comprises the following steps of: adding the raw materials into a magnetic separator to obtain a coarse-fraction product with the particle size range of 5-100mm and a fine-fraction product with the particle size range of 0.5-5mm, and cleaning and drying the products to remove surface dust and pollutants. Sequential and parallel recognition and sorting of multi-dimensional physical attributes such as color (photoelectricity), density (jigging) and magnetism (magnetic separation) of ore particles are achieved, the function limitation of a single sorting method is overcome through the multi-technology coupling mechanism, and a large amount of waste rock is efficiently thrown at the front end through photoelectric pre-sorting; the enriched valuable minerals can be intensively treated by subsequent gravity separation and magnetic separation equipment, and the unit operation efficiency is improved.

The invention discloses a combined pre-concentration and waste discarding method for strong and weak magnetic mixed iron ore, which comprises the following steps of: crushing the strong and weak magnetic iron ore to below 50mm in a closed-circuit manner, and screening the strong and weak magnetic iron ore into three particle fractions of 50-20mm, 20-2mm and 2-0mm; an electromagnetic dry separator and a photoelectric intelligent dry separator are adopted for conducting pre-selection and waste throwing treatment on the iron ore with the particle size of 50-20 mm, and weak magnetic dry separation block concentrate and pre-selected concentrate I are obtained; a permanent magnet drum type dry magnetic separator and a permanent magnet roller type strong magnetic dry separator are adopted for conducting pre-selection and waste throwing treatment on the iron ore with the particle size of 20-2 mm, and pre-selected concentrate II is obtained; and a wet electromagnetic drum type magnetic separator and a pulsating high-gradient magnetic separator are adopted for conducting pre-selection and waste throwing treatment on the iron ore with the particle size of 2-0 mm, and pre-selected concentrate III is obtained. According to the method, multiple pre-selection waste throwing methods are adopted in a combined mode, the separation performance of all equipment is fully played, a large number of gangue entering the separation process is reduced, the raw ore separation quality and the system processing capacity are effectively improved, the production cost is reduced, and the method has wide application prospects.

The invention discloses a preparation method of high-purity fused quartz powder, and the preparation method specifically comprises the following steps: S1, crushing; s2, fully washing the quartz powder with water, and then removing impurities; s3, feeding the crushed particles subjected to impurity removal into a pickling tank for pickling; s4, dissolving the crude product in two times of alkaline solution, carrying out alkali washing treatment, and carrying out ultrasonic cleaning after the treatment is completed; s5, the cleaned raw materials are fed into a heating furnace to be subjected to high-temperature heat treatment; s6, magnetic separation is repeated; and S7, further crushing into fused quartz sand of which the particle size is less than 2mm by adopting an impact crusher. According to the preparation method of the high-purity fused quartz powder, circulating pickling is adopted, the optimal pickling condition acid concentration, acid dosage, pickling time, pickling temperature and the like are selected, metal impurities are effectively removed, and the purification effect is good; repeated magnetic separation is carried out under high and low field intensities, the magnetic separation effect is good, magnetic impurities are preliminarily and efficiently removed, and the purity of the whole manufactured product is high.

The present invention provides a method for the resource utilization of acidolysis waste residue of sulfuric acid process titanium dioxide, belonging to the technical field of solid waste resource utilization. The acidolysis waste residue of sulfuric acid process titanium dioxide is subjected to classification to remove the coarse particle charcoal impurities mixed in during the production process. After classification and impurity removal, the acidolysis waste residue of sulfuric acid process titanium dioxide is subjected to strong magnetic rough separation by a high-gradient magnetic separator to recover ilmenite therein, obtaining strong magnetic rough concentrate and strong magnetic rough tailings; the strong magnetic rough concentrate is further subjected to high-gradient strong magnetic cleaning to obtain titanium concentrate and strong magnetic cleaning tailings; the strong magnetic rough tailings are subjected to high-gradient strong magnetic scavenging to obtain strong magnetic scavenging concentrate and magnetic separation tailings; the strong magnetic cleaning tailings and the strong magnetic scavenging concentrate are combined as middlings and returned to the strong magnetic rough separation for re-selection; the magnetic separation tailings are pretreated by roasting and water washing to remove impurities such as organic matter and carbonaceous substances therein; the ore after roasting and water washing pretreatment for impurity removal is subjected to alkali leaching under mild conditions to obtain high-purity water glass and alkali leaching residue respectively; the high-purity water glass solution can be further adjusted by pH to obtain high-purity silica in the form of precipitation method; the alkali leaching residue is separated and purified by flotation or gravity separation to obtain rutile concentrate and silicate tailings, and the obtained silicate tailings have less impurity content and can be used as raw materials for preparing building materials such as cement. The present invention realizes the full resource high-efficiency comprehensive utilization of the acidolysis waste residue of sulfuric acid process titanium dioxide, is beneficial to avoiding waste of resources, and can produce important economic and environmental benefits.

Disclosed herein is an apparatus for separation of diamagnetic particles of sub-micron diameter from a fluid. The disclosed apparatus includes a first magnetic coil including a hollow center and a separation unit including an outer enclosure and a second magnetic coil. The second magnetic coil includes a single-layer of windings of a magnetic wire and at least one nonmagnetic wire on a nonmagnetic core where the first magnetic coil houses the separation unit in the hollow inner center. Also disclosed herein is a method of using the apparatus.

The invention relates to a system, comprising: a) a sample processing unit, comprising an input port and an output port coupled to a rotating container having at least one sample chamber, the sample processing unit configured provide a first processing step to a sample or to rotate the container so as to apply a centrifugal force to a sample deposited in the chamber and separate at least a first component and a second component of the deposited sample; and b) a sample separation unit coupled to the output port of the sample processing unit, the cell separation unit comprising separation column holder, a pump and a plurality of valves configured to at least partially control fluid flow through a fluid circuitry and a separation column positioned in the holder, the separation column configured to separate labeled and unlabeled components of sample flowed through the column.

An apparatus is disclosed for inducing magnetism in a flowstream of at least partially magnetisable, dry particulate feed material, in order to effect a subsequent particle classification. The dry separation stage is located proximal to the magnetic induction apparatus, in the form of a treatment chamber 10 with a plurality of spaced-apart magnets 16, 18 located adjacent to, and moveably displaceable along the length of both an upper and a lower side region of the treatment chamber 10, to generate a localised magnetic induction field zone. Conveyer belts 22, 24 carrying the dry particles move across each of the outer faces of the magnets 16, 18 on both sides of the chamber 10, but at differential relative velocities to each other, creating a region of air-particle fluidisation and agitation within the treatment chamber 10 and then a physical separation of the particulate feed material can occur based upon their susceptibility to magnetic induction.

The present invention belongs to the field of mineral processing, and specifically relates to a method for separating mixed concentrates of gold and copper flotation, comprising the following steps: (1) breaking hydrophobic floccules of mixed concentrates of gold and copper flotation; (2) eliminating organic matter in the solution to keep the aqueous solution clean; (3) preliminary pre-separation of mixed concentrates of gold and copper flotation; (4) grinding and dissociation of some gold and copper conjoined bodies; (5) conveying the slurry of step (4) to a hydrocyclone for classification; (6) purifying the rough gold concentrate and recovering some chalcopyrite; (7) conveying the gold concentrate slurry of step (6) to a sedimentation tank for sedimentation, and the obtained gold concentrate (natural gold particles) can be directly purified and refined; copper concentrate I, copper concentrate II and copper concentrate III are conveyed to a dehydration system composed of a thickener and a filter for dehydration, and qualified copper concentrate is used as a raw material for smelting and extracting copper, and a small amount of gold contained in the copper concentrate can be recovered. The present invention can separate mixed concentrates of gold and copper to obtain gold and copper concentrates with stable indicators and reliability.

The invention relates to the technical field of refractory iron ore dressing and smelting, and discloses a fluxed oolitic hematite full-dry utilization method which comprises the following steps: crushing fluxed oolitic hematite to obtain a crushed material, screening the crushed material to obtain an oversize product and an undersize product, and pre-selecting and discarding the oversize product to obtain pre-selected rough concentrate and tailings; the pre-selected rough concentrate is crushed to obtain a crushed material, the crushed material and the screen underflow are mixed to obtain a mixture, and the mixture is subjected to strong magnetic dry separation to obtain rough concentrate and rough tailings; the rough concentrate and sintering raw materials are mixed to obtain a mixed material, the mixed material is granulated to obtain a sintering mixed material, and the sintering mixed material is distributed, ignited and sintered; and the coarse tailings are magnetized and roasted to obtain roasted ores, the roasted ores are ground to obtain fine-ground concentrates, and the fine-ground concentrates are separated to obtain magnetite concentrates and fine tailings. The fluxed oolitic hematite is processed, industrial application of the fluxed oolitic hematite is achieved, and the method has important practical significance on comprehensive utilization of mineral resources.

The present invention relates to the field of magnetic ore separation technology, and in particular to a high-efficiency magnetic separation method for titanium concentrate. The technical key points are as follows: the titanium concentrate includes at least one of magnetic titanium concentrate, iron-containing mineral impurities, non-magnetic minerals and other non-magnetic impurities; the method comprises: performing weak magnetic separation on the titanium concentrate to obtain a first separation and a strongly magnetic iron-containing mineral impurity; performing component analysis on the first separation, and if the Fe in the first separation is 3+ The content of is greater than a first preset value, first magnetic particles and second magnetic particles are added to obtain a first magnetized separation; the first magnetized separation is subjected to a first strong magnetic separation to obtain a second separation, non-magnetic minerals and other non-magnetic impurities; the second separation is acidified and subjected to a second strong magnetic separation to obtain magnetic titanium concentrate and iron-based weakly magnetic mineral impurities; the non-magnetic minerals and other non-magnetic impurities are subjected to solid-liquid separation to obtain non-magnetic titanium concentrate.

The invention discloses a pre-oxidation-magnetic-flotation combined beneficiation process for strengthening separation of copper-molybdenum bulk concentrate. The method comprises the following steps: (1) carrying out pre-oxidation treatment on copper-molybdenum bulk concentrate; the method comprises the following steps: stirring and mixing an oxidant solution with a certain concentration with minerals, filtering after reaction, and washing the surface with deionized water to obtain initial raw ores; (2) the initial raw ore is subjected to pulp mixing to form ore pulp, the ore pulp is added into a high-gradient magnetic separator for magnetic separation, magnetic products and non-magnetic products are obtained through two times of strong magnetic separation under a certain magnetic field intensity, and the magnetic products are copper concentrates; and (3) the magnetic separation middlings and the non-magnetic products are combined to be subjected to flotation, one-time roughing, three-time concentration and three-time scavenging are adopted in the flotation process, an inhibitor, a collecting agent and a foaming agent are sequentially added, air inflation is started for flotation separation after uniform stirring, and flotation concentrates are molybdenum concentrates. The invention has the characteristics of lower energy consumption, lower production cost and better sorting effect.

Systems and methods are provided for the transport and separation of transition metal solutes using magnetic fields. A high-gradient magnetic field can be generated between the flat-faced poles of an electromagnet. The magnetic separation process can be enhanced by the aggregation of paramagnetic metal solutes into clusters, which are predicted to be two orders of magnitude larger than individual solute units.

A method and apparatus for continuous magnetic filtration of ferrous mill scale from liquid solution employs a tank for receipt of fluids laden with mill scale. A curvate trough within the tank receives a rotatable magnetic drum and establishes a channel therebetween. An air compressor and associated manifold generate bubbles within the tank and adjacent the rotatable magnetic drum. The mill scale attaches to the bubbles, which are attracted to the surface of the drum where the mill scale accumulates. The accumulation of mill scale particles is moved about the surface of the rotating drum by a scraper proximate the surface thereof. By moving the accumulated mill scale particles to regions of the rotating drum that are of a magnetic force insufficient to retain them upon the surface of the drum, the mill scale particles are removed and passed to a conveyor system.

An apparatus for inducing magnetism in a flowing stream of at least partially magnetisable dry particulate feed material for subsequent particle classification is disclosed. The dry separation stage is positioned close to the magnetic induction device in the form of a process chamber 10 having a plurality of spaced apart magnets 16, 18 positioned adjacent to and movably displaceable along the length of both upper and lower side regions of the process chamber 10 to create localized magnetic induction field regions. Conveyors 22, 24 carrying dry particles move through each of the outer surfaces of magnets 16, 18 on both sides of the chamber 10, but at mutually different relative speeds, creating regions of air-particle fluidization and agitation within the processing chamber 10, and then physical separation of the particulate feed material may occur based on their sensitivity to magnetic induction.

The present invention provides a method for recovering rare earth elements, and belongs to the technical field of rare earth pyrometallurgy. The waste carbon material produced by molten salt electrolysis of rare earth metals or alloys is crushed and then magnetically separated to obtain a concentrate with high content of iron, lithium and rare earth elements and a tailing with low content of iron, lithium and rare earth elements. More than 70% of the rare earth elements are enriched in the 15-25% concentrate, which can be directly reused or recycled after further treatment, thereby avoiding the waste of rare earths in the waste carbon material. At the same time, the carbon content in the tailings is increased and the impurities in the tailings are reduced. The subsequent processing amount of the waste carbon material is reduced, and the process has the advantages of simple process, convenience and reliability, no pollution to the environment, and high recovery rate.

The invention provides a method and equipment for extracting and recovering tantalum and niobium metals from lepidolite tailings, and relates to the technical field of metal material recovery, the method comprises the following steps: step S1, the tailings are crushed and ball-milled to a certain fineness; s2, tantalum-niobium minerals in the tailings are preliminarily enriched through a gravity concentration method, and roughed tantalum-niobium concentrates and roughed tailings are obtained; and S3, primary scavenging is conducted on the roughing tailings through a high-gradient magnetic separation method, and roughing tantalum-niobium concentrate and magnetic separation tailings are obtained. According to the scheme, the tantalum-niobium concentrate with the grade larger than 18% and the recovery rate larger than 40% is finally obtained after the tantalum-niobium concentrate with the primary shaking table and the tantalum-niobium concentrate with the secondary shaking table are evenly mixed, and a certain amount of valuable metal elements such as tantalum and niobium are contained in the lepidolite tailings; by means of the method, the originally abandoned rare metals can be recycled, resource waste is reduced, and the comprehensive utilization rate of mineral resources is increased.

A method (14) for the recovery of vanadium, the method comprising the steps of: (i) Subjecting a vanadium-containing ore (12) to a beneficiation step (14) incorporating a sequence of medium-intensity magnetic separation, high-intensity magnetic separation and reverse silica flotation processes to form a vanadium-containing concentrate; (ii) Roasting (44) the vanadium-containing concentrate; (iii) Leaching (54) a product of the roasting step (ii) to extract vanadium into a pregnant leach liquor; (iv) Passing the pregnant leach liquor of leaching step (iii) to a precipitation step (90); and (v) Treating a precipitate from step (iv) to obtain a vanadium product (112), wherein an iron-titanium product (74) from step (iii) is recovered.

Disclosed herein is an apparatus for separation of diamagnetic particles of sub-micron diameter from a fluid. The disclosed apparatus includes a first magnetic coil including a hollow center and a separation unit including an outer enclosure and a second magnetic coil. The second magnetic coil includes a single-layer of windings of a magnetic wire and at least one nonmagnetic wire on a nonmagnetic core where the first magnetic coil houses the separation unit in the hollow inner center. Also disclosed herein is a method of using the apparatus.

The present application relates to a kind of low-grade complex lead-zinc-gold-silver ore high-efficiency comprehensive recovery method, comprising: (1) two-stage selective crushing and grinding classification;(2) pulse high gradient magnetic separation;(3) gold-silver-containing iron concentrate cyanide carbon slurry gold-silver;(4) magnetic separation tailings flotation lead gold silver;(5) floatation lead tailings flotation zinc.The present application is classified by two-stage selective crushing and grinding and pulse high gradient magnetic separation before flotation, effectively prevent primary fine material and slime overgrinding and mud, and preferentially separate micro-fine hematite and limonite, to reduce the adverse effects of micro-fine material on flotation, then use multi-stage flotation and cyanide carbon slurry process to recover valuable metals in magnetic separation tailings and gold-silver-containing hematite and limonite concentrate respectively, realize comprehensive recovery of gold-silver-iron-lead-zinc in low-grade complex lead-zinc-gold-silver ore, and the high-efficiency comprehensive recovery effect is remarkable, successfully solve the problem of low recovery rate, high recovery cost and lead-zinc cannot be recovered in single flotation process.

A method of beneficiating iron ore streams, the method comprising the steps of sizing an iron ore stream to provide a fines fraction of less than 3.0 mm diameter particle size and contacting the fines fraction with a magnetic field and magnetically separating the fines fraction into a concentrate stream and a tailings stream.

An apparatus is disclosed for inducing magnetism in a flowstream of at least partially magnetisable, dry particulate feed material, in order to effect a subsequent particle classification. The dry separation stage is located proximal to the magnetic induction apparatus, in the form of a treatment chamber 10 with a plurality of spaced-apart magnets 16, 18 located adjacent to, and moveably displaceable along the length of both an upper and a lower side region of the treatment chamber 10, to generate a localised magnetic induction field zone. Conveyer belts 22, 24 carrying the dry particles move across each of the outer faces of the magnets 16, 18 on both sides of the chamber 10, but at differential relative velocities to each other, creating a region of air-particle fluidisation and agitation within the treatment chamber 10 and then a physical separation of the particulate feed material can occur based upon their susceptibility to magnetic induction.

An apparatus is disclosed for inducing magnetism in a flowstream of at least partially magnetisable, dry particulate feed material, in order to effect a subsequent particle classification. The dry separation stage is located proximal to the magnetic induction apparatus, in the form of a treatment chamber 10 with a plurality of spaced-apart magnets 16, 18 located adjacent to, and moveably displaceable along the length of both an upper and a lower side region of the treatment chamber 10, to generate a localised magnetic induction field zone. Conveyer belts 22, 24 carrying the dry particles move across each of the outer faces of the magnets 16, 18 on both sides of the chamber 10, but at differential relative velocities to each other, creating a region of air-particle fluidisation and agitation within the treatment chamber 10 and then a physical separation of the particulate feed material can occur based upon their susceptibility to magnetic induction.

The invention provides a reciprocating type pulsating high-gradient superconducting magnet machine, and belongs to the technical field of superconducting magnets, the reciprocating type pulsating high-gradient superconducting magnet machine comprises a mounting seat and a control system, the top of the mounting seat is fixedly connected with a fixing seat, the top of the fixing seat is fixedly connected with a superconducting magnet assembly, and an inner cavity of the superconducting magnet assembly is provided with a sorting assembly; one side of the mounting seat is fixedly connected with a pulsation driving assembly, the top of the pulsation driving assembly is fixedly connected with a feeding assembly, the control system comprises a controller module, a sensor module and a driver module, the superconducting magnet assembly comprises a shell, the bottom of the shell is fixedly connected with the top of the fixing seat, and the bottom of the shell is fixedly connected with the top of the fixing seat. An inner cavity of the shell is fixedly connected with a superconducting magnet, and the top of the shell is fixedly connected with a low-temperature cooling device. According to the invention, a high-gradient magnetic field can be generated, so that the capturing capability of magnetic mineral particles is greatly enhanced, and even weak magnetic minerals can be effectively adsorbed.

The invention discloses a lepidolite ore treatment method which comprises the following steps: pretreatment of lithium chinastone ore, continuous high-gradient magnetic separation, efficient gravity concentration and strong magnetic separation, desliming flotation, recovery of lepidolite from mineral separation tail mud, recycling of waste tail mud, separation of quartz sand and feldspar in tailings, and preparation of a gel material from lepidolite lithium extraction tailings. According to the method, the lithium chinastone is fully recycled, all valuable metals in the ore are extracted, the tail mud generated in the process is further subjected to flotation to be used for extracting the lepidolite concentrate, and the tail mud obtained after the lepidolite concentrate is extracted is used for preparing ceramics; flotation tailings are used as raw materials for feldspar extraction and quartz extraction; the lithium extraction tailings are used for preparing a gel material. According to the method, a lithium chinastone resource recycling system is constructed, closed-loop flow of raw materials, products, wastes and regenerated raw materials is realized, and the utilization efficiency of lithium chinastone resources and the environmental benefits are improved.

The invention pertains to a method of manufacturing a defined population of target cells from a mixed population of blood cells using an apparatus that is configured for processing such cells using a sterile tubing set,wherein the tubing set comprises: (a) an input port configured to receive and deliver the sample to a rotating container, (b) said rotating container, which is configured to rotate about an axis and thereby to apply centrifugal force to a sample contained in a processing chamber in the container so as to separate cells from the sample from other components of the sample; (c) an output port configured to transfer cells processed by the rotating container to a cell separation column; (d) said separation column, which is configured to separate labeled cells from unlabeled cells; and (e) an output port configured to transfer cells separated by the cell separation column to a product collection container. According to the invention, the the method comprises: (1) delivering the sample through the input port into the tubing set; and (2) operating the apparatus such that the sample is processed by the rotating container and by the separation column in the tubing set whereby the target cells are delivered into the product collection container while maintaining sterility of the target cells throughout the aforelisted components of the tubing set.

The invention discloses an efficient resource utilization method for smelting slag calcium and magnesium leaching tailings, and belongs to the technical field of solid waste resource utilization. According to the method, the smelting slag calcium and magnesium leaching tailings are subjected to Raymond mill or jet mill treatment, the obtained material is separated through high-gradient magnetic separation, and iron-rich concentrate and silicon-rich tailings are obtained, the Raymond mill or jet mill is combined with the high-gradient magnetic separation technology, and efficient separation of silicon and iron in the smelting slag calcium and magnesium leaching tailings can be achieved; the magnetic separation iron ore concentrate is used for the steel production process, the silicon-containing component is used as a building material or used for preparing a mineral material, and the problem that resource utilization of the smelting slag carbon sequestration tailings is difficult is effectively solved.

The invention discloses a quality-divided enrichment-stepped suspension roasting-iron separation and copper leaching method for copper-containing limonite difficult to separate, and belongs to the technical field of beneficiation metallurgy. The method mainly comprises five sections of operations of recovering strong magnetic iron minerals by low-intensity magnetic separation, separating and enriching by high-intensity magnetic separation, carrying out stepped suspension roasting, extracting copper from roasted products by a wet method and extracting iron by low-intensity magnetic separation. The method comprises the following steps: carrying out raw ore crushing and grinding on refractory copper-containing limonite, recovering strong magnetic iron minerals through low-intensity magnetic separation, carrying out high-intensity magnetic separation quality-divided enrichment on low-intensity magnetic separation tailings, carrying out acid leaching on strong roughing tailings to obtain copper-rich acid leaching liquid, carrying out gradient suspension roasting on high-intensity magnetic separation concentrate, and carrying out acid leaching on roasted products to obtain copper-rich acid leaching liquid and iron-rich leaching residues; and the iron-rich leaching residues are subjected to ore grinding dissociation and low-intensity magnetic separation recovery, and iron ore concentrate is obtained. Compared with the prior art, copper and iron in the refractory copper-containing limonite can be comprehensively and efficiently recycled, and the resource utilization rate of the refractory copper-containing limonite is greatly increased.

The invention provides a method for removing heavy metal toxicity from polluted soil, and relates to the technical field of soil remediation, and the method comprises the following steps: carrying out primary crushing on the polluted soil, and carrying out primary size grading on obtained first particles by taking 5mm as a boundary to obtain materials with two size fractions of + 5mm and-5mm; carrying out secondary crushing on the material with the particle size of-5mm, and carrying out secondary size grading on obtained second particles with the boundary of 1mm, so as to obtain the material with the particle size of-1mm and the material with the particle size of 1-5mm; and performing dry magnetic separation on the materials with the particle sizes of + 5mm and 1-5mm, and performing wet magnetic separation on the materials with the particle size of-1mm to separate heavy metals. According to the method, through combined optimization of size grading and a magnetic separation process, efficient separation of metallurgical slag with different particle sizes is achieved, and the content of heavy metal in the treated soil reaches the second-class land use standard of Soil Pollution Risk Management and Control Standard for Soil Environmental Quality Construction Land (GB36600-2018).

The present invention discloses an improved magnetic system of a reciprocating series tank type superconducting magnetic separator, wherein the magnetic separator comprises two subsystems, namely a magnetic system and a separation structure subsystem, which cooperate with each other. The magnetic system comprises a low temperature thermostat (2), wherein the low temperature thermostat (2) is provided with a high magnetic conductivity material (3) on its outer cover, wherein a superconducting winding (1) is provided inside the low temperature thermostat (2), wherein the magnetic field generated in the cylindrical space symmetrical on both sides of the central cross section of the inner aperture of the low temperature thermostat (2) is the main magnetic field, and the magnetic field generated in the space outside the high magnetic conductivity material (3) is the leakage magnetic field, wherein the transition region of the magnetic field is between the main magnetic field and the leakage magnetic field, and a reverse winding (7) is provided in the transition region of the magnetic field between the main magnetic field and the leakage magnetic field. The present invention has an ingenious structure, improves the cleaning effect of the magnetic medium, improves the production efficiency of the device, and prolongs the service life of the magnetic medium.