CN110216009B - Method for sorting steel slag - Google Patents
Method for sorting steel slag Download PDFInfo
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- CN110216009B CN110216009B CN201910525307.6A CN201910525307A CN110216009B CN 110216009 B CN110216009 B CN 110216009B CN 201910525307 A CN201910525307 A CN 201910525307A CN 110216009 B CN110216009 B CN 110216009B
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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
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
- B03B9/06—General arrangement of separating plant, e.g. flow sheets specially adapted for refuse
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/52—Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly
Abstract
The invention discloses a steel slag sorting method, which is characterized by comprising the following steps: the method comprises the following steps: the method comprises the following steps: carrying out primary ball milling on the steel slag until the granularity of the steel slag is 80-100 meshes, and then carrying out primary magnetic separation to obtain primary magnetic separation concentrate and tailings for later use; step two: demagnetizing the primary magnetic concentrate, performing secondary ball milling on the demagnetized primary magnetic concentrate to reach the granularity of 180-200 meshes, and performing secondary magnetic separation on the ball-milled concentrate to obtain secondary magnetic concentrate and tailings for later use; step three: and carrying out demagnetizing treatment on the secondary magnetic concentrate, and then carrying out three-stage ball milling and multiple times of magnetic separation and gravity separation treatment on the demagnetized concentrate to obtain the ultra-high-purity magnetite concentrate and the high-grade iron concentrate. The method is mainly used for sorting the ultra-pure magnetite concentrate from the steel slag, belongs to a pure physical method, does not use chemical agents in the production process, and is green and environment-friendly; in the production cost, the cost is 35 percent of the cost of producing the ultra-high purity magnetite concentrate by the traditional chemical method, and the method has obvious economic benefit and market popularization value.
Description
Technical Field
The invention relates to the field of iron ore concentrate sorting, in particular to a sorting method of steel slag.
Background
The grade of the iron ore concentrate produced by iron ore dressing plants in China at present is generally between 58% and 68%, and the iron ore concentrate enters a blast furnace after being sintered or made into pellets. According to the current market condition prediction, the supply of high-grade iron ore concentrate (more than 69.00%) for non-blast furnace iron making is one of the conditional future key development directions of iron ore concentrate production enterprises. The high-grade iron ore concentrate is also called super iron ore concentrate, high-purity iron ore concentrate, high-quality iron ore concentrate and the like according to different purposes, and is iron ore concentrate with high iron content and low gangue content. It is not only a deep processing product of mineral separation, but also a novel functional material with great development potential. At present, high-grade iron ore concentrates are mainly divided into two types, one type is magnetite ore concentrates with the iron grade higher than 69.00 percent and the content of silicon dioxide and other impurities less than 3.00 percent, and the magnetite ore concentrates can be used for non-blast furnace iron making (direct reduction iron or melting iron making and the like); the second is magnetite concentrate with iron grade higher than 71.50% and silicon dioxide and other impurity (acid insoluble substance) content less than 0.20% -3.00%, and is mainly used in the fields of powder metallurgy, magnetic materials and the like.
TABLE 1 quality Standard of high-grade magnetite concentrate
Ferriferrous oxide (ferriferrous oxide), chemical formula Fe3O4. The black iron oxide is also called magnetic iron oxide because it is a black crystal with magnetism. At present, the iron oxide synthesis main processes at home and abroad can be roughly divided into a dry process and a wet process. The dry processes are divided into gas-phase processes and solid-phase processes, the gas-phase processes often being based on carbonyl iron (Fe (CO))5) Or ferrocene (FeCP)2) The like as raw materials, and the like, and the raw materials are prepared by adopting the principles of flame pyrolysis, vapor deposition, low-temperature plasma chemical deposition (PCVD), laser pyrolysis and the like and by adopting the methods of roasting, pyrolysis, Rough (Ruthner) and the like, and the methods are gradually abandoned by the industry due to the defects of inevitable waste gas pollution, difficult control of the technological process, difficult quality guarantee and the like in the dry method process; the wet method, also known as a liquid phase method, is a main method for preparing powder materials widely adopted in laboratories and industries at present, and mainly comprises a sol-gel method, an air oxidation method, a hydrolysis method, a precipitation method and the like; in addition, there is water heatThe method, the catalysis method, the core-wrapping method and other process improvement methods. The main advantages are easy control of the components, simple equipment and low production cost; the disadvantages are that many impurities exist, high-performance particle powder is difficult to obtain, and the generated particles are easy to form pseudo particles of conglomerate and difficult to disperse.
In the last decade, with the application of fine grinding, low intensity magnetic separation, strong magnetic separation, gravity separation, heating flotation, reverse flotation and other ore separation technologies in the ore separation field of iron oxide ore, the iron oxide ore can be developed and utilized in a large scale. However, the magnetite and the iron oxide ore in the mixed iron ore have very large magnetic difference and are closely embedded and distributed with each other, so that the separation difficulty is more difficult, and the processing cost is very high. A large amount of mixed iron ore in China has low grade and fine disseminated granularity, and magnetite and iron oxide ore are required to be completely dissociated to realize effective separation of minerals. Chinese patent CN104190522B discloses a magnetic gravity screening process for mixed iron ore, which comprises the following process steps: the method comprises the following steps of first-stage ore grinding operation, first-stage grading operation, first-stage low-intensity magnetic separation operation, first-stage high-intensity magnetic separation operation, gravity separation operation, high-frequency screening operation and second-stage ore grinding and grading operation. The patent can only carry out further mineral separation from coarse iron ore with 15-20% of iron content, the grade of the iron ore concentrate product is 63-66%, and the iron ore concentrate product cannot reach the standard of high-grade iron ore concentrate. Chinese patent CN104888943B discloses a magnetic separation method for obtaining high-grade iron ore concentrate, which combines two modes of magnetic separation and grinding magnetic separation to separate iron ore. The magnetic separation mode comprises the components of a magnet, a partition plate and a tailing receiver, the magnet and the partition plate form a separation space, and the magnetic agglomeration is effectively utilized for separation; the grinding and magnetic separation mode refers to magnetic separation after iron ore powder to be separated is ground, and the mode effectively utilizes friction to separate. For low-grade iron ore with the iron grade of 27.90 percent and the granularity of less than 75 mu m accounting for 75 percent, the iron grade after the separation is 68.45 percent, and the iron recovery rate is 66.09 percent; for high-grade iron ore with the iron grade of 45.52 percent and the granularity of less than 71 mu m accounting for 89 percent, the iron grade after the separation is 69.89 percent, the iron recovery rate is 90.97 percent, and the invention can not meet the requirement of the ultra-high purity magnetite concentrate.
In the prior art, the following problems exist in the magnetic suspension separation technology of the ultra-pure magnetite concentrate: 1. at the present stage, the preparation is carried out in small batches on a laboratory scale, and a certain amount of chemical reagents still need to be used; 2. the adopted raw materials are as follows: 21085, falling iron scale with iron content more than or equal to 90; 3. the technology has the advantages of less raw material impurities, high cost (the current price is about 2000-2500 yuan/ton), and only can be used for preparing the ultrahigh-purity magnetite concentrate nanospheres and the ultrahigh-purity magnetite concentrate nanopowders with extremely low consumption in high-end markets.
Disclosure of Invention
The invention aims to: aiming at the existing problems, the steel slag sorting method is provided, the ultra-high purity magnetite concentrate is prepared by a physical method, and the steel slag is recycled to prepare various iron products, so that the utilization rate of the steel slag is improved, and the problem of environmental pollution caused by the preparation of the ultra-high purity magnetite concentrate is further solved.
The technical scheme adopted by the invention is as follows:
a steel slag sorting method is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: carrying out primary ball milling on the steel slag until the granularity of the steel slag is 80-100 meshes, and then carrying out primary magnetic separation to obtain primary magnetic separation concentrate and tailings for later use;
step two: demagnetizing the primary magnetic concentrate, performing secondary ball milling on the demagnetized primary magnetic concentrate to reach the granularity of 180-200 meshes, and performing secondary magnetic separation on the ball-milled concentrate to obtain secondary magnetic concentrate and tailings for later use;
step three: carrying out demagnetizing treatment on the secondary magnetic concentrate, and then carrying out three-section ball milling and multiple times of magnetic separation and gravity separation treatment on the demagnetized concentrate to obtain ultra-high purity magnetite concentrate and high-grade iron concentrate;
the steel slag comprises the following main elements: iron and iron-containing oxide, silicate impurities; the iron-containing oxide comprises Fe2O3And Fe3O4Firstly, the invention utilizes the characteristics that silicate impurities belong to nonmagnetic substances and the density is lower than that of iron elements, and effectively separates the iron elements and the silicate impurities in the steel slag by adopting a method of magnetic separation and gravity separation; then, according to Fe2O3Magnetic propertyLess than Fe3O4And Fe, adopting a permanent magnetic drum magnetic separator for magnetic separation to separate Fe in the steel slag2O3Same Fe3O4Effectively separating out metallic iron (small steel impurities); finally, according to Fe3O4The density is lower than that of metal iron (small steel particles), and the method of gravity separation of a layered concentrator is adopted to separate Fe in the steel slag3O4And the iron and the metal are effectively separated, so that the ultra-high purity magnetite concentrate is selected.
Because the particle size of the 80-100-mesh mineral aggregate is relatively thick, the mineral aggregate still contains more impurities, the grade of the iron ore obtained by primary magnetic separation is still low, and the requirement of a client cannot be met, so that secondary separation is needed, however, the impurities and the iron ore concentrate are associated together, if the iron ore is not subjected to further fine grinding, and the magnetic separation is performed again, the associated impurities in the iron ore are still more, the grade of the iron ore cannot be obviously changed, and the significance of secondary magnetic separation is not great. In the invention, in order to solve the problem, the concentrate obtained by the primary magnetic separation is ball-milled again to obtain a finer mineral aggregate, meanwhile, in order to sort out the iron ore concentrate as much as possible, the obtained finer mineral aggregate is subjected to secondary magnetic separation, the magnetic field intensity of the secondary magnetic separation is smaller than that of the primary magnetic separation, so that the situation that the iron ore with lower grade is mixed into the iron ore with high grade is avoided, the grade of the concentrate obtained by the secondary magnetic separation is obviously improved, but the high requirement of a client can not be met, and correspondingly, even if the primary magnetic separation is carried out again, the grade of the iron ore can not be obviously improved, and the high requirement of the client can not be met.
Wherein the magnetic field intensity of the second magnetic separation is less than that of the first magnetic separation.
Furthermore, the magnetic field intensity of the first magnetic separation is 800-900 GS, and the magnetic field intensity of the second magnetic separation is 400-450 GS.
Further, the third step further includes the following steps:
(1) carrying out three-stage ball milling on the demagnetized secondary magnetic concentrate until the grinding granularity is 325-400 meshes, carrying out primary gravity separation on the ball-milled concentrate, wherein the concentrate obtained by gravity underflow is a primary gravity separation concentrate, and carrying out gravity separation overflow to obtain high-grade iron concentrate;
(2) carrying out third magnetic separation on the primary gravity concentrate, carrying out demagnetizing treatment on the concentrate obtained by the magnetic separation, carrying out fourth magnetic separation again, and carrying out demagnetizing treatment on the concentrate obtained by the fourth magnetic separation to obtain fourth magnetic separation concentrate;
(3) performing secondary reselection on the four times of magnetic separation concentrates, and performing tertiary reselection on secondary reselection concentrates obtained by reselecting the underflow; the concentrate obtained by the third gravity overflow is ultra-pure magnetite concentrate, and the high-grade iron concentrate is obtained by gravity underflow;
and the magnetic field intensity of the third magnetic separation is smaller than that of the second magnetic separation, and the magnetic field intensity of the fourth magnetic separation is smaller than that of the third magnetic separation.
Furthermore, the magnetic field intensity of the third magnetic separation is 300-350 GS, and the magnetic field intensity of the fourth magnetic separation is 240-280 GS.
Further, the method also comprises the following steps: and drying the concentrate obtained by the third gravity overflow to obtain ultra-high-purity magnetite concentrate, and gravity underflow to obtain high-grade iron concentrate.
And further, combining the primary gravity overflow in the step (1) and the secondary gravity overflow and the tertiary gravity underflow in the step (3) to obtain concentrate, and drying to obtain the finished high-grade iron concentrate.
The method for sorting the cement-iron correcting agent from the steel slag is characterized in that tailings obtained in the first step and the second step are used as the cement-iron correcting agent, and the cement-iron correcting agent is dried to obtain a finished product.
Further, the iron content of the steel slag is more than or equal to 51 percent.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the invention is mainly used for sorting ultra-pure magnetite concentrate from steel slag, belongs to a pure physical beneficiation method, does not use chemical agents in the production process, and is beneficial to environmental protection; meanwhile, the production water can be recycled, and the steel slag can be completely utilized, so that zero emission is achieved. The beneficiation method is green and environment-friendly, solves the environmental protection pressure of industrial and mining enterprises, is 35 percent of the cost of producing the ultra-high purity magnet concentrate powder by the traditional chemical method (the cost of post-treatment of chemical method waste residues, waste water and waste gas is not included) in the production cost, and has obvious economic benefit and market popularization value.
2. The invention adopts the combined magnetic gravity process flow consisting of the permanent magnetic drum magnetic separator and the layered concentrating machine to separate the ultra-high purity magnetite concentrate from the steel slag, wherein the ultra-high purity magnetite concentrate contains Fe3O4The purity is 98.67-99.78%, the yield of the selected ultra-high-purity magnetite concentrate is about 20%, the yield of the high-grade iron concentrate is about 40%, the yield of the high-grade iron concentrate is about 67.7-68.7%, and the yield of the cement iron correcting agent is about 40%.
3. The invention can realize the complete reutilization of the steel slag, and the sorted products can be respectively used as a cement iron correction agent, high-grade iron concentrate and ultra-pure magnetite concentrate, thereby realizing the maximization of the utilization of the steel slag.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a flow chart of a steel slag sorting method.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification (including any accompanying claims, abstract) may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
Taking the sand steel slag originally produced in Jiangsu province as an example, the average iron content is more than or equal to 51 percent.
Example 1
As shown in fig. 1, a method for sorting cement iron correction agent from steel slag is provided, which comprises the following steps:
the method comprises the following steps: performing primary ball milling on the steel slag until the granularity of the steel slag is 100 meshes, and performing primary magnetic separation to obtain primary magnetic separation concentrate and tailings for later use; firstly, raw materials are put into a first-stage ball mill for first ball milling, grinding materials after the first ball milling are put into a high weir type spiral classifier for classification, steel slag with unqualified grain size (larger than 100 meshes) classified by the high weir type spiral classifier is returned into the first-stage ball mill for continuous ball milling, the circulation is carried out for many times until the grain size of the classified mineral aggregate is smaller than 100 meshes, the mineral aggregate with the grain size smaller than 100 meshes after the classification is subjected to first magnetic separation, the magnetic field intensity of the first magnetic separation is 850 +/-50 GS, and tailings obtained by the magnetic separation can be used as a cement iron correction agent.
Example 2
A steel slag sorting method specifically comprises the following steps:
the method comprises the following steps: performing primary ball milling on the steel slag until the granularity of the steel slag is over 80 meshes, and performing primary magnetic separation to obtain primary magnetic separation concentrate and tailings for later use; firstly, raw materials enter a section of ball mill to carry out primary ball milling, grinding materials after primary ball milling enter a high weir type spiral classifier to be classified, steel slag with unqualified particle size (larger than 80 meshes) classified by the high weir type spiral classifier enters a section of ball mill to be continuously ball-milled, multiple circulation is carried out until the particle size of the classified mineral aggregate is smaller than 80 meshes, the mineral aggregate with the particle size smaller than 80 meshes after classification is subjected to primary magnetic separation, the magnetic field intensity of the primary magnetic separation is 850 +/-50 GS, primary magnetic separation concentrate and tailings are obtained through the magnetic separation, and the tailings can be used as a cement iron correcting agent.
Step two: the magnetically separated primary magnetic separation concentrate enters a demagnetizer for demagnetizing, the demagnetized concentrate enters a two-stage ball mill for secondary ball milling, the grinding material after secondary ball milling is graded by an immersed spiral classifier, the graded overflow enters a hydrocyclone for secondary grading, the overflow of the hydrocyclone enters a high-frequency sieve for screening, the granularity of the mineral aggregate below the high-frequency sieve is less than 180 meshes, the underflow of the hydrocyclone and the oversize of the high-frequency sieve return to the two-stage ball mill for continuous ball milling, the circulation is performed for multiple times until the granularity of the graded mineral aggregate is less than 180 meshes, secondary magnetic separation is performed to obtain secondary magnetic separation concentrate and tailings, and the tailings can be used as a cement iron correcting agent.
Example 3
The embodiment provides a steel slag sorting method, which specifically comprises the following steps:
the method comprises the following steps: performing primary ball milling on the steel slag until the granularity of the steel slag is 90 meshes, and performing primary magnetic separation to obtain primary magnetic separation concentrate and tailings for later use; the method comprises the steps of firstly, feeding raw materials into a first-stage ball mill for primary ball milling, feeding grinding materials subjected to primary ball milling into a high weir type spiral classifier for classification, feeding steel slag with unqualified particle size (larger than 90 meshes) classified by the high weir type spiral classifier into the first-stage ball mill for continuous ball milling, repeatedly performing circulation until the particle size of the classified mineral aggregate is smaller than 90 meshes, performing primary magnetic separation on the mineral aggregate with the particle size smaller than 90 meshes after classification, wherein the magnetic field intensity of the magnetic separation is 850 +/-50 GS, and performing the magnetic separation to obtain primary magnetic separation concentrate (with iron content of 62-64%) and tailings, wherein the tailings can be used as a cement iron correcting agent.
Step two: demagnetizing the magnetically separated primary magnetic concentrate in a demagnetizer, performing secondary ball milling on the demagnetized concentrate in a two-stage ball mill, classifying the abrasive material subjected to the secondary ball milling by an immersed spiral classifier, classifying the classified overflow into a hydrocyclone for secondary classification, screening the overflow of the hydrocyclone in a high-frequency sieve, returning the underflow of the hydrocyclone and the oversize of the high-frequency sieve to the two-stage ball mill for continuous ball milling, circulating for many times until the granularity of the classified mineral material is less than 200 meshes for secondary magnetic separation, and performing secondary magnetic separation to obtain secondary magnetic concentrate and tailings, wherein the secondary magnetic concentrate (the iron content is 69-70%) and the tailings obtained by the secondary magnetic separation can be used as a cement iron correction agent.
The third step further comprises the following steps:
(1) carrying out three-stage ball milling on the demagnetized secondary magnetic concentrate, screening the ball-milled concentrate by a high-frequency sieve, wherein the granularity of mineral aggregate below the high-frequency sieve is less than 325 meshes, carrying out ball milling on the oversize product of the high-frequency sieve, repeating the process for many times until the granularity of the screened mineral aggregate is less than 325 meshes, carrying out primary gravity separation on the ball-milled concentrate, wherein the concentrate obtained by gravity underflow is the primary gravity concentrate, and obtaining high-grade iron concentrate by gravity overflow;
(2) carrying out third magnetic separation on the concentrate obtained by the first magnetic separation, wherein the magnetic field intensity of the third magnetic separation is 325 +/-25 GS, carrying out demagnetizing treatment on the concentrate obtained by the third magnetic separation, carrying out fourth magnetic separation, wherein the magnetic field intensity of the fourth magnetic separation is 260 +/-20 GS, carrying out demagnetizing treatment on the concentrate obtained by the fourth magnetic separation to obtain fourth magnetic separation concentrate, and obtaining tailings which are high-grade iron concentrate;
(3) performing secondary reselection on the concentrate subjected to the fourth magnetic separation, and performing tertiary reselection on the concentrate obtained by the secondary reselection on the underflow; the concentrate obtained by the third gravity overflow is ultra-pure magnetite concentrate, and the second gravity overflow and the third gravity underflow are combined to obtain high-grade iron concentrate;
because FeO, metallic Fe and Fe contained in the steel slag3O4The magnetic property of the iron is good, the metal iron, the ferric oxide and other impurities are removed by continuous purification of magnetic separation, but the iron and the Fe are difficult to be effectively purified by only depending on the magnetic separation technology3O4Separation of Fe contained in the product3O4The purity of (2) is hardly more than 96%. In contrast, the present invention utilizes FeO (relative density 5.73) and Fe (relative density 7.84) with Fe3O4(relative density 5.18) relative density difference (0.55-2.26), and respectively separating FeO and metallic Fe from Fe by two times of reselection3O4Separating, and performing two times of gravity separation and magnetic separation to obtain the product and the ultra-pure magnetite concentrate (containing Fe)3O4The purity is 98.67-99.78%).
Because the magnetic property of the ultra-high purity magnetite concentrate is good, the magnetic concentrate can still generate serious geomagnetic agglomeration after being demagnetized by a demagnetizer, and the magnetic agglomeration causes the impurities of the superfine grade in the steel slag to be adsorbed or wrapped in the magnetic agglomeration, so that the ultra-high purity magnetite concentrate or the calcium-containing suspended matters exceed the standard or the lead content exceeds the standard; the content of impurities such as calcium, lead and the like in the ultra-pure magnetite concentrate prepared by the embodiment is further reduced.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (6)
1. A steel slag sorting method is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: carrying out primary ball milling on the steel slag until the granularity of the steel slag is 80-100 meshes, and then carrying out primary magnetic separation to obtain primary magnetic separation concentrate and tailings for later use;
step two: demagnetizing the primary magnetic concentrate, performing secondary ball milling on the demagnetized primary magnetic concentrate to reach the granularity of 180-200 meshes, and performing secondary magnetic separation on the ball-milled concentrate to obtain secondary magnetic concentrate and tailings for later use;
step three: carrying out demagnetizing treatment on the secondary magnetic concentrate, and then carrying out three-section ball milling and multiple times of magnetic separation and gravity separation treatment on the demagnetized secondary magnetic concentrate to obtain ultra-high purity magnetite concentrate and high-grade iron concentrate;
wherein the magnetic field intensity of the second magnetic separation is less than that of the first magnetic separation;
the third step further comprises the following steps:
(1) carrying out three-stage ball milling on the demagnetized secondary magnetic concentrate until the grinding granularity is 325-400 meshes, carrying out primary gravity separation on the ball-milled concentrate, wherein the concentrate obtained by gravity underflow is a primary gravity separation concentrate, and carrying out gravity separation overflow to obtain high-grade iron concentrate;
(2) carrying out third magnetic separation on the primary gravity concentrate, carrying out demagnetizing treatment on the concentrate obtained by the magnetic separation, carrying out fourth magnetic separation again, and carrying out demagnetizing treatment on the concentrate obtained by the fourth magnetic separation to obtain fourth magnetic separation concentrate;
(3) performing secondary reselection on the four times of magnetic concentrate, and performing tertiary reselection on concentrate obtained by gravity underflow; the concentrate obtained by the third gravity overflow is ultra-pure magnetite concentrate, and the high-grade iron concentrate is obtained by gravity underflow;
and the magnetic field intensity of the third magnetic separation is smaller than that of the second magnetic separation, and the magnetic field intensity of the fourth magnetic separation is smaller than that of the third magnetic separation.
2. The method for selecting steel slag according to claim 1, wherein the method comprises the following steps: the magnetic field intensity of the first magnetic separation is 800-900 GS, and the magnetic field intensity of the second magnetic separation is 400-450 GS.
3. The method for sorting steel slag according to claim 2, wherein the magnetic field strength of the third magnetic separation is 300-350 GS, and the magnetic field strength of the fourth magnetic separation is 240-280 GS.
4. The method for selecting steel slag according to claim 3, further comprising the steps of: and performing reselection overflow to obtain ultra-pure magnetite concentrate through third reselection, and performing reselection underflow to obtain high-grade iron concentrate.
5. The method for selecting steel slag according to claim 1, wherein the tailings obtained in the first step and the second step are used as cement-iron correction agents, and the cement-iron correction agents are dried to obtain finished cement-iron correction agents.
6. The method for selecting steel slag according to claim 1, wherein the iron content of the steel slag is not less than 51%.
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| CN109365106A (en) * | 2018-10-29 | 2019-02-22 | 酒泉钢铁(集团)有限责任公司 | A kind of stainless steel slag dry type magnetic separation device and technique |
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