CN111285405A - Method for separating calcium ferrite and magnesium ferrite from steel slag magnetic separation tailings - Google Patents
Method for separating calcium ferrite and magnesium ferrite from steel slag magnetic separation tailings Download PDFInfo
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- CN111285405A CN111285405A CN202010092045.1A CN202010092045A CN111285405A CN 111285405 A CN111285405 A CN 111285405A CN 202010092045 A CN202010092045 A CN 202010092045A CN 111285405 A CN111285405 A CN 111285405A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/30—Combinations with other devices, not otherwise provided for
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Abstract
The invention belongs to the field of resource regeneration, and particularly relates to a method for separating calcium ferrite and magnesium ferrite from steel slag magnetic separation tailings. The invention firstly crushes the steel slag magnetic separation tailings containing 20 to 30 percent of iron to 10 to 13mm by selective crushing equipment, and selectively dissociates coarse elementary substance iron particles. Then magnetic separation is carried out under the field intensity of 300 Gs-1500 Gs, and the coarse-grained simple substance iron is removed in the form of magnetic separation concentrate and is used as a steelmaking raw material. And then finely crushing the magnetic separation tailings to 0.5-3.5 mm by using roller type crushing equipment, and selectively dissociating calcium ferrite and magnesium ferrite by using hardness difference. Then magnetic separation is carried out under the field intensity of 500 Gs-3200 Gs, fine-particle elementary substance iron is separated and merged into the steelmaking raw material, and the residual calcium ferrite and magnesium ferrite crude products are purified by a vibrating bed eddy current separator to produce the final product. Combining the tailings without special purposes generated in the process for producing the cementing material, and finally realizing the resource utilization of the full components of the steel slag.
Description
Technical Field
The invention belongs to the field of renewable resources, and relates to a method for separating calcium ferrite and magnesium ferrite from steel slag magnetic separation tailings.
Background
The production process of calcium ferrite and magnesium ferrite is complex, has high requirements on the quality of raw materials, and has numerous applications in chemical industry and electronic industry. Meanwhile, the steel slag stacking amount and the yield of China are huge, but the comprehensive utilization rate is only about 17%. Not only affecting the steel production, but also easily causing the surrounding environmental pollution. The calcium ferrite and the magnesium ferrite are important components of RO phase in the steel slag and belong to inert components. The fine separation of calcium ferrite and magnesium ferrite from the steel slag has practical application value.
The Chinese invention patent CN107721211A discloses a method for efficiently separating and recovering RO phase in steel slag, which comprises the following steps: step 1), crushing steel slag; step 2), loading electric charge; step 3), RO phase sorting; step 4), separating and recovering; the invention takes the steel slag as a processing object, firstly, the steel slag is crushed and sieved, the grain diameter is less than 100 meshes, then, the steel slag micro powder passes through a charge loading device, so that fine powder particles are charged with the same polarity, and thus, repulsive electrostatic force is generated, super dispersion processing is realized, then, air blasting is carried out, so that the fine powder particles pass through an electromagnetic separator in a suspension state, RO phase is separated and removed, and the residual materials are recycled.
The Chinese invention patent CN106755650A discloses a process for producing high-activity steel slag powder and inert mineral products from steel slag. The process comprises six steps of dry grinding, pneumatic separation, dry magnetic separation, wet grinding, wet magnetic separation and dehydration. The dry grinding is to grind the tailing powder after the iron slag is recovered into steel slag powder to realize the dissociation of inert minerals; the pneumatic separation is to use a superfine powder separator to classify the steel slag powder according to the granularity to realize the enrichment of inert minerals in coarse powder, and fine powder is a high-activity steel slag powder product; the dry magnetic separation is to purify coarse powder into coarse concentrate by using the magnetism of inert minerals, and the coarse tailings are returned to the dry grinding; grinding the coarse ore concentrate by a wet method to prepare fine ore pulp; wet magnetic separation is carried out to separate fine slurry into wet inert minerals and wet cement iron raw materials; the two wet materials are respectively dehydrated to prepare an inert mineral product and a cement iron raw material, and water is returned to the wet grinding; the invention processes the steel slag into high-activity steel slag powder, high-iron grade inert mineral products and cement iron raw materials.
The Chinese invention patent CN104888948A discloses a special RO phase magnetic separator for fluidized steel slag micro powder, which comprises a fluidized part and a magnetic separation part, wherein the fluidized part comprises a fluidized groove, a feed hopper, a discharge hole, an air pump, an air inlet, an air suction hole and a dust remover. The magnetic separation part comprises a rotary magnetic disk, an outer shell, a magnetic system disk, a vertical shaft, a shaft sleeve, a transmission part and a motor, wherein the vertical shaft is vertically arranged, the lower end of the vertical shaft extends into the separation cavity, the lower end of the vertical shaft is fixedly provided with the static magnetic system disk, magnetic blocks are embedded on the magnetic system disk to form a magnetic system, the shaft sleeve is sleeved on the lower section of the vertical shaft and driven by the motor through gear transmission, and a rotary assembly is arranged between the shaft sleeve and the vertical shaft and provided with the outer shell made of stainless steel. After the method is applied, the content of the inert substances in the steel slag micro powder after the RO phase separation can be reduced to 15% from about 35% originally, the activity index of the steel slag micro powder after the RO phase separation is greatly improved, and the quality requirement of the building material market on the steel slag micro powder can be met.
The Chinese invention patent CN109554552A discloses a slag RO phase separation system and a working method. A discharging device is arranged below the material storage device in a matching way; a magnetic separation device is arranged below the discharging device in a matched mode, a first outlet and a second outlet are respectively arranged below the magnetic separation device in a matched mode, a first stirring device is correspondingly arranged at the first outlet, a first grinding device is arranged below the second outlet in a matched mode, the magnetic separation device is arranged below the first grinding device, a front side outlet and a rear side outlet are arranged below the magnetic separation device, and filter pressing devices are respectively arranged below the front side outlet and the rear side outlet; a collecting device is arranged below the filter pressing device; the second stirring device is correspondingly provided with an output device: the method can quickly sort the RO phase in the slag, and carry out flue gas treatment on the slag before sorting, thereby improving the stability of the sorting system and being beneficial to recycling the slag.
The invention of China patent CN108031539A discloses a hot-stuffy and hot-splashing steel slag processing metal recovery process, which selects two closed-loop circulation process technologies of steel slag crushing, iron removal, pretreatment, steel slag magnetic separation and iron removal pre-grinding, wherein the two closed-loop circulation process technologies comprise an electromagnetic chuck, a heavy-falling hammer, a hydraulic overturning sieve, a hydraulic jaw crusher, a rod mill, a novel wide-band magnetic separator, a wide distributor and the like, and realizes the metal recovery process of the steel slag obtained by multiple cooling modes of hot splashing and hot splashing. The invention has the advantages that: the invention can simultaneously carry out the processing of hot stuffy slag and hot splashing slag and the metal recovery production process, so that the output of the production line is multiplied by 100 ten thousand tons per year, and the quality of the tailings meets the requirement of a domestic vertical mill on producing high-value steel slag micro powder.
The Chinese invention patent CN109365106A discloses a stainless steel slag dry-type magnetic separation device and a process, belonging to the technical field of metallurgy and mineral engineering, wherein the device comprises a raw material bin, a scrap steel collecting device, a crushing and screening device, a magnetic separation device comprises a magnetic separation unit, a screening mechanism and an abrasive mechanism, and the crushing and screening device comprises a crushing mechanism, a separating mechanism and a scattering mechanism; the process comprises primary crushing and screening, secondary crushing and screening, iron removal, material scattering, primary magnetic separation and screening and secondary magnetic separation. In the process of treating the stainless steel slag, 58-60% of the stainless steel slag does not need to be ground, and water and a tailing pond are not needed to be arranged in the treatment.
The Chinese invention patent CN106694517B discloses a production process for preparing steel slag micro powder by the synergistic purification of steel slag magnetic separation powder, belonging to the technical field of comprehensive utilization of steel slag. The method comprises the following steps: pouring magnetic separation powder into a receiving hopper, and sequentially carrying out a drying and powder separation process through a vibrating feeder, a belt scale and a bucket elevator; performing countercurrent heat exchange with hot air in a powder concentrator, and then performing a coarse crushing process or a subsequent grinding process; the coarsely broken materials enter a scattering and grading process, and the generated coarse materials are magnetically separated by a magnetic separator; grinding with a steam mill; the average grain diameter of the fine powder after the grinding process is less than or equal to 30 microns, then a special RO phase magnetic separator for the steel slag micro powder is adopted for magnetic separation, and finally the powder is collected. The method can purify the metal resources in the steel slag magnetic separation powder and simultaneously process the non-metal substances in the steel slag magnetic separation powder to separate high-activity steel slag micro powder and non-active steel slag micro powder, thereby being beneficial to subsequent classification and utilization.
Therefore, the existing steel slag RO phase separation process can only utilize magnetic separation to separate RO phase crude products, and can not further separate high-quality calcium ferrite and magnesium ferrite products from the RO phase.
The Chinese invention patent CN108862402A discloses a method for recovering iron resources in steel slag, which comprises the following steps: melting steel slag, and blowing adjustable oxidizing gas onto the liquid level of the steel slag to oxidize FeO in the steel slag; step two, cooling the reacted steel slag, and preserving heat after the temperature is stable; and step three, cooling the steel slag after heat preservation. After the steps, the finally generated MgFe2O4Spinel phase and Fe3O4All are the main iron-containing material phases in the steel slag utilized in the invention. Through the treatment steps provided by the invention, (1) the iron grade in the steel slag after magnetic separation is improved, and the steel slag can be used as an iron ore resource for steel production; (2) compared with the conventional common steel slag iron resource recovery processing method, the method improves the yield of iron in the steel slag; (3) the steel slag amount of post-treatment is reduced, and the effect of reducing solid waste of the steel slag is achieved.
The Chinese invention patent CN109225614A discloses a method for enhancing the RO phase magnetism of steel slag and separating inert minerals from the steel slag. Specifically, the steel slag powder within a certain particle size range is magnetized and roasted at a certain temperature and in a certain atmosphere. The mass magnetic susceptibility of the steel slag RO phase after roasting can be improved by 3-10 times, and the magnetic selection of the steel slag RO phase is greatly improved.
Therefore, the existing steel slag RO phase chemical treatment-separation process can only improve the magnetic separation efficiency through phase-to-phase conversion, and can not further produce and separate high-quality calcium ferrite and magnesium ferrite products.
Disclosure of Invention
The invention provides a method for separating calcium ferrite and magnesium ferrite from steel slag magnetic separation tailings.
A method for separating calcium ferrite and magnesium ferrite from steel slag magnetic separation tailings is characterized by comprising the following steps: crushing the steel slag magnetic separation tailings by adopting hammer type and jaw type crushing equipment, and selectively dissociating coarse-grained simple substance iron; then carrying out magnetic separation under the field intensity of 300 Gs-1500 Gs to separate out the coarse-grained simple substance iron particles; finely crushing the tailings by using a roller type crushing device, and selectively dissociating coarse particles of calcium ferrite and magnesium ferrite by using hardness difference; then magnetic separation is carried out under the field intensity of 500 Gs-3200 Gs, and crude products of calcium ferrite and magnesium ferrite are separated; and finally, treating the crude products of the calcium ferrite and the magnesium ferrite by using a vibrating bed eddy current separator to improve the grade of the products.
Furthermore, the raw material is steel slag magnetic separation tailings containing 20-30% of iron, but not steel slag raw particles.
Further, after coarse-grained simple substance iron particles with iron content more than 63% are separated by magnetic separation, the magnetic separation tailings are crushed to 0.5-3.5 mm by a high-pressure roller mill and a roller crusher which have selective crushing effect on the brittle particles.
Furthermore, a vibration bed eddy current separator is adopted to treat the crude product, the grade of the calcium ferrite and magnesium ferrite products is improved, and the content of impurity minerals in the final product is less than 2.5%.
Furthermore, the vibration stroke of the feeding groove of the vibration bed eddy current sorting equipment is 1.5-35 mm, and the frequency of impact is 60-900.
Further, the tailings remaining after the extraction of calcium and magnesium ferrites are used to produce cementitious materials.
Compared with the prior RO phase separation technology, the invention takes the steel slag characteristics as the basis, adopts a selective dissociation method to fragment the steel slag in sections, and finally utilizes the particle conductivity and magnetism difference to promote the grades of calcium ferrite and magnesium ferrite products by means of an eddy current separation technology. The method has innovation in the aspects of raw materials, sorting principle, sorting equipment, sorting method, final products and the like, and is a new and efficient separation method.
Drawings
FIG. 1 shows a process flow for separating calcium ferrite and magnesium ferrite from steel slag magnetic separation tailings.
Detailed Description
The following examples are provided to illustrate the practice of the present invention, but are not intended to limit the scope of the invention.
Example 1:
synthetic steel slag of steel mill in Hubei provinceThe magnetic separation tailings comprise the following main components (multiple test range values): 26.22 to 27.61 percent of TFeS, 37.10 to 38.98 percent of CaO, 7.50 to 8.22 percent of MgO, and Al2O34.23％～5.24％，SiO211.59％～14.20％，SO30.16％～0.27％。
The use process comprises the following steps:
(1) selectively dissociating coarse elementary iron. Taking 5kg of raw material steel slag magnetic separation tailings, firstly crushing the raw material steel slag magnetic separation tailings to 9.8-11.2 mm (average value of multiple measurements, the same below) by using a jaw crusher, and selectively dissociating coarse-grained simple substance iron particles.
(2) Separating coarse particle elementary substance iron. Under the field intensity of 795 Gs-810 Gs (average value of multiple measurements, the same below), a dry powder magnetic separator is adopted for magnetic separation, coarse-grained simple substance iron is removed in the form of magnetic separation concentrate, and the coarse-grained simple substance iron contains iron of 69.01-70.12% (average value of multiple measurements, the same below) and is used as a steelmaking raw material.
(3) Selectively dissociating calcium ferrite and magnesium ferrite. The tailings are finely crushed to 2.5 mm-3 mm by a roller type crushing device, and calcium ferrite and magnesium ferrite are selectively dissociated by hardness difference.
(4) Separating the crude products of calcium ferrite and magnesium ferrite. Magnetic separation is carried out under the field intensity of 990 Gs-1005 Gs, and crude products of calcium ferrite and magnesium ferrite are separated. The residual fine-grained elementary substance iron after separation contains 71.22-71.86% of iron and is combined into the steelmaking raw material.
(5) And (5) purifying the product. Purifying calcium ferrite and magnesium ferrite by using a vibrating bed eddy current separator. The stroke of a feeding trough of the vibrating bed eddy current separator is 3mm, the stroke frequency is 600, and the content of impurity minerals in a product is less than 2%. The tailings produced are separated and used for producing the cementing material.
Example 2:
the comprehensive steel slag magnetic separation tailings of a certain steel mill in Hebei province comprise the following main components: 22.14 to 22.37 percent of TFe, 36.15 to 37.03 percent of CaO36, 8.77 to 9.09 percent of MgO and Al2O32.22％～2.38％，SiO216.35％～16.41％，SO30.21％～0.32％。
The use process comprises the following steps:
(1) selectively dissociating coarse elementary iron. Taking 20kg of raw material steel slag magnetic separation tailings, firstly crushing the raw material steel slag magnetic separation tailings to 12.82-12.96 mm by using a jaw crusher, and selectively dissociating coarse-grained simple substance iron particles.
(2) Separating coarse particle elementary substance iron. Under the field intensity of 540 Gs-552 Gs, a dry powder magnetic separator is adopted for magnetic separation, coarse-grained simple substance iron is removed in the form of magnetic separation concentrate, and the latter contains 68.27% -68.76% of iron and is used as a steelmaking raw material.
(3) Selectively dissociating calcium ferrite and magnesium ferrite. Finely crushing the tailings to 2.45-2.68 mm by using a roller type crushing device, and selectively dissociating calcium ferrite and magnesium ferrite by using hardness difference.
(4) Separating the crude products of calcium ferrite and magnesium ferrite. Magnetic separation is carried out under the field intensity of 880 Gs-905 Gs, and crude products of calcium ferrite and magnesium ferrite are separated. The residual fine-grained elementary substance iron after separation contains 73.26-74.44% of iron and is combined into the steelmaking raw material.
(5) And (5) purifying the product. Purifying calcium ferrite and magnesium ferrite by using a vibrating bed eddy current separator. The stroke of a feeding groove of the vibrating bed eddy current separator is 5mm, the stroke frequency is 230, and the content of impurity minerals in a product is less than 1.63%. The tailings produced are separated and used for producing the cementing material.
Example 3:
the comprehensive steel slag magnetic separation tailings of a certain steel mill in Liaoning province comprise the following main components: 27.31 to 27.93 percent of TFe, 31.35 to 31.08 percent of CaO31, 9.77 to 9.89 percent of MgO, and Al2O31.93％～2.16％，SiO216.82％～16.97％，SO30.30％～0.31％。
The use process comprises the following steps:
(1) selectively dissociating coarse elementary iron. Taking 10kg of raw material steel slag magnetic separation tailings, firstly crushing the raw material steel slag magnetic separation tailings to 12.91-13.77 mm by using a jaw crusher, and selectively dissociating coarse-grained simple substance iron particles.
(2) Separating coarse particle elementary substance iron. Under the field intensity of 1139 Gs-1157 Gs, a dry powder magnetic separator is adopted for magnetic separation, coarse-grained simple substance iron is removed in a form of magnetic separation concentrate, and the coarse-grained simple substance iron contains iron of 70.05% -70.23% and is used as a steelmaking raw material.
(3) Selectively dissociating calcium ferrite and magnesium ferrite. Finely crushing the tailings to 1.05-1.11 mm by using a roller type crushing device, and selectively dissociating calcium ferrite and magnesium ferrite by using hardness difference.
(4) Separating the crude products of calcium ferrite and magnesium ferrite. Magnetic separation is carried out under the field intensity of 990 Gs-1110 Gs, and crude products of calcium ferrite and magnesium ferrite are separated. The residual fine-grained elementary substance iron after separation contains 72.11-72.85% of iron and is combined into the steelmaking raw material.
(5) And (5) purifying the product. Purifying calcium ferrite and magnesium ferrite by using a vibrating bed eddy current separator. The stroke of a feeding groove of the vibrating bed eddy current separator is 2.5mm, the stroke frequency is 800, and the content of impurity minerals in a product is less than 2.41 percent. The tailings produced are separated and used for producing the cementing material.
Claims (6)
1. A method for separating calcium ferrite and magnesium ferrite from steel slag magnetic separation tailings is characterized by comprising the following steps: crushing the steel slag magnetic separation tailings by adopting hammer type and jaw type crushing equipment, and selectively dissociating coarse-grained simple substance iron; then carrying out magnetic separation under the field intensity of 300 Gs-1500 Gs to separate out the coarse-grained simple substance iron particles; finely crushing the tailings by using a roller type crushing device, and selectively dissociating calcium ferrite and magnesium ferrite by using the hardness difference; then magnetic separation is carried out under the field intensity of 500 Gs-3200 Gs, and crude products of calcium ferrite and magnesium ferrite are separated; and finally, purifying the crude product by using a vibrating bed eddy current separator, and improving the grade of the calcium ferrite and magnesium ferrite products.
2. The method for separating calcium ferrite and magnesium ferrite from steel slag magnetic separation tailings as claimed in claim 1, which is characterized in that: the raw material is steel slag magnetic separation tailings containing 20-30% of iron, but not steel slag original particles.
3. The method for separating calcium ferrite and magnesium ferrite from steel slag magnetic separation tailings as claimed in claim 1, which is characterized in that: after coarse-grained simple substance iron particles with iron content of more than 63 percent are separated out by magnetic separation, the magnetic separation tailings are further crushed to 0.5-3.5 mm by roller type crushing equipment with selective crushing effect on brittle particles, such as a high-pressure roller mill, a roller type crusher and the like.
4. The method for separating calcium ferrite and magnesium ferrite from steel slag magnetic separation tailings as claimed in claim 1, which is characterized in that: and purifying the crude product by adopting a vibrating bed eddy current separator, and improving the quality grade of the calcium ferrite and the magnesium ferrite, wherein the content of impurity minerals in the final product is less than 2.5%.
5. The method for separating calcium ferrite and magnesium ferrite from steel slag magnetic separation tailings as claimed in claim 4, wherein the method comprises the following steps: the vibration stroke of the feeding groove of the vibration bed eddy current sorting equipment is 1.5-35 mm, and the frequency of impact is 60-900.
6. The method for separating calcium ferrite and magnesium ferrite from steel slag magnetic separation tailings as claimed in claim 1, which is characterized in that: the tailings remaining after the extraction of calcium and magnesium ferrites are used to produce cementitious materials.
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| CN113967525A (en) * | 2021-10-26 | 2022-01-25 | 山东永鑫环保科技有限公司 | Production process of high-activity steel slag micro powder |
| CN114137060A (en) * | 2021-11-29 | 2022-03-04 | 安徽工业大学 | Method for detecting oxidability of casting residue |
| CN114735954A (en) * | 2022-04-12 | 2022-07-12 | 山东莱钢永锋钢铁有限公司 | Hot disintegration treatment method for converter steel slag |
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