CN112642580B - Disposal method for gradient utilization of steel slag - Google Patents
Disposal method for gradient utilization of steel slag Download PDFInfo
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- CN112642580B CN112642580B CN202011385664.6A CN202011385664A CN112642580B CN 112642580 B CN112642580 B CN 112642580B CN 202011385664 A CN202011385664 A CN 202011385664A CN 112642580 B CN112642580 B CN 112642580B
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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
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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
- B03B1/00—Conditioning for facilitating separation by altering physical properties of the matter to be treated
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
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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
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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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
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- Y02W30/50—Reuse, recycling or recovery technologies
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Abstract
The application relates to the technical field of steel slag utilization, in particular to a disposal method for gradient utilization of steel slag, which solves the problems that in the prior art, the steel slag is treated by hot disintegrating, cooling and decomposing, then waste steel and magnetic separation powder with larger grain size are selected, a steel slag treatment system has low metal recovery rate, unsatisfactory crushing effect, higher energy consumption and short service life of wear-resistant devices, and more and less grinding can not be realized, and iron fine particles, iron fine powder, tailings, tail mud and other products are obtained by treating the steel slag through technologies such as crushing, magnetic separation, screening, wet grinding and the like, and the iron fine particles and the iron fine powder can be directly taken out. The secondary crushing process is designed to fully crush the steel slag, reduce the average grain diameter of the steel slag, reduce the loss of wear-resistant devices of the ball mill, fully realize more crushing and less grinding, and reduce the energy consumption; the magnetic separation processes are matched with each other for multiple times, so that the recovery rate of metal resources is improved, and the problems of low grinding efficiency and high cost of the existing steel slag are solved.
Description
Technical Field
The application relates to the technical field of steel slag utilization, in particular to a disposal method for gradient utilization of steel slag.
Background
The steel slag is composed of salts of various oxides formed by oxidizing impurities such as silicon, manganese, phosphorus, sulfur and the like in pig iron in the smelting process and solvent reaction. Steel slag contains a number of useful components: 2-8% of metallic iron, 40-60% of calcium oxide, 3-10% of magnesium oxide and 1-8% of manganese oxide, so that the alloy can be used as a ferrous metallurgy raw material.
Patent CN 110586297a discloses a steel slag treatment method and a steel slag treatment production line, which utilize a jaw crusher and a vertical crusher to carry out secondary crushing on steel slag, effectively separate large-granularity iron particles or iron blocks, utilize a double-layer screening machine to screen, separate slag and iron particle mixtures with granularity less than or equal to 5mm and more than 1mm in steel slag, reduce the load of a magnetic roller iron selector, and effectively improve the magnetic separation efficiency of the magnetic roller iron selector, thereby effectively improving the recovery rate of metal substances such as iron particles, iron blocks and the like.
Patent CN 109092844A discloses a multistage treatment method for steel slag, which comprises the steps of crushing, sieving and magnetic separation of steel slag in a circulating way, and finally obtaining iron powder with TFe more than 60% and tailings with MFe less than 1%. The tailing powder can be used as a roadbed cushion layer, a water stabilization layer and the like together with the substituted sand stone aggregate to be used as raw materials of commercial concrete and mortar; or used as an auxiliary material to prepare pellets or used as a mixture scrap steel briquette. The metal recovery rate is more than 99%, and zero emission is truly realized.
Patent CN 111036370a discloses a production method of multi-specification steel slag aggregate, which adopts raw steel slag to carry out cyclic treatment through a steel slag aggregate space screening and crushing system, and simultaneously obtains multi-specification steel slag aggregate; the steel slag aggregate space screening and crushing system at least comprises a device cover body, crushing equipment and a screening device, and the steel slag aggregate space screening and crushing system provided by the application reduces the occupation of the production line by a reasonable arrangement mode, reduces the production dust in the production process, and is an environment-friendly, safe and efficient intensive production mode.
Similar to the above patent, domestic treatment on steel slag is usually to select waste steel and magnetic separation powder with larger grain size after hot disintegrating, cooling and decomposing, and due to the technical bottleneck, the steel slag treatment system has the problems of low metal recovery rate, unsatisfactory crushing effect, higher energy consumption, short service life of wear-resistant devices, incapability of realizing more crushing and less grinding, and the like.
Therefore, we propose a disposal method for gradient utilization of steel slag to solve the above problems.
Disclosure of Invention
The application aims to solve the defects in the prior art, and provides a disposal method for gradient utilization of steel slag.
In order to achieve the above purpose, the present application adopts the following technical scheme:
the application provides a disposal method for gradient utilization of steel slag, which comprises the following steps:
s1, pre-crushing: pre-crushing the steel slag by using a jaw crusher, wherein the grain size of the steel slag meets 0-40 mm, and then secondarily crushing the pre-crushed steel slag, and the grain size of the steel slag meets 0-5 mm;
s2, magnetic separation: screening the secondarily crushed steel slag again, conveying the steel slag with the grain diameter of less than 5mm to a strong magnetic machine, selecting iron fine particles with the Mfe of more than 60%, piling up the iron fine particles in a landing mode, and returning the steel slag with the grain diameter of more than 5mm to a raw material bin for secondary crushing to form a closed loop;
s3, wet grinding: uniformly mixing the magnetic separation residual steel slag with water in a clean water tank, conveying to a wet ball mill, and adjusting the parameters of the ball mill to ensure that the discharge grain size is less than or equal to 1mm;
s4, wet magnetic separation: delivering the discharged materials of the ball mill to a permanent magnet drum type magnetic separator for wet magnetic separation, separating out refined iron slurry, dehydrating by a dehydrating device to obtain refined iron powder products, and precipitating and press-filtering residues to obtain tailings;
s5, precipitation and filter pressing: sieving the residue slurry after magnetic separation to obtain tailings slurry and undersize mineral liquid, and conveying the tailings slurry to a sedimentation tank for sedimentation and filter pressing to obtain tailings;
s6, cake making: and draining undersize mineral liquid and tailings to a sedimentation tank by using a filter press, collecting the tailings slurry through sedimentation and filter-pressing water obtained by filter-pressing water and filter-pressing tailings into a clean water tank through sedimentation, and conveying the sedimented slurry into the filter press by using a slurry pump to prepare mud cakes and piling the mud cakes on the ground.
Preferably, in S2, the iron concentrate with Mfe >60% is selected to be 5mm or less, and Mfe is metallic iron.
Preferably, in the step S1, the secondary crushing crusher is a vertical crusher, the frequency is 25HZ, and the processing capacity is 5t/h.
Preferably, in the step S2, the strong magnetic machine is a magnetic roller iron selecting machine, and the magnetic field strength is 6000-8000 GS.
Preferably, in the step S6, the upper clean water in the sedimentation tank can be used for wet ball milling, so as to realize water resource recycling.
Preferably, S11 is further included: and adding potassium sodium tartrate into the secondarily crushed steel slag, and continuously stirring and mixing the steel slag for 5-10 min.
Preferably, the mass ratio of the steel slag to the potassium sodium tartrate is 100: (0.01-0.03).
Preferably, the grain size of the obtained fine iron particles is 0-5 mm, the grain size of the fine iron powder is 0-1 mm, and the grain size of the tailings is 0-1 mm.
Preferably, the grain size of the obtained fine iron particles is 3mm, the grain size of the fine iron powder is 0.5mm, and the grain size of the tailings is 0.5mm.
Compared with the prior art, the application has the beneficial effects that:
1. according to the application, the steel slag is pretreated through a twice crushing process, the grain diameter of the steel slag entering the wet ball milling tank is controlled within the range of 0-5 mm, the grinding test piece of the steel slag in the ball mill is reduced, the wear-resistant device of the ball mill is protected, the service life is prolonged, more crushing and less grinding are realized, and the energy consumption is reduced.
2. The waste slag after magnetic separation is uniformly mixed with water and then is conveyed to the wet ball mill, the wet ball mill can be used for effectively carrying out carefully selecting treatment on the steel slag with the iron content of less than 40%, and meanwhile, the wet ball mill can be used for avoiding dust pollution caused by the reduction of the size of the steel slag, so that the production environment is effectively ensured to be clean and safe.
3. The water obtained by precipitating and filter-pressing the tailings slurry and the filter-pressing water obtained by filter-pressing the tailings slurry are collected into a clean water tank through precipitation, can be used for wet ball milling, forms a second closed loop, realizes the recycling of water resources, and avoids sewage discharge.
4. According to the application, each process device is reasonably arranged, the steel slag is treated to obtain the fine iron particles, the fine iron powder, the tailings and the tail mud, the fine iron particles and the fine iron powder can be directly exported to the steel plant for re-melting, so that the economic value is realized, the tailings and the tail mud can be used as building materials in the field of building, and the engineering construction cost is greatly reduced.
In summary, the application breaks the steel slag twice, reduces the grain size of the steel slag, effectively reduces the equipment pressure of the ball mill, protects the wear-resistant device, prolongs the service life, fully embodies 'more broken and less ground', effectively reduces the energy consumption of a production system, simultaneously adopts wet ball milling to avoid dust pollution caused by the reduction of the steel slag size, effectively ensures the clean and safe production environment, screens to obtain processed products including fine iron particles, fine iron powder, tailings and tailings, and the fine iron particles and the fine iron powder can be directly and externally sold and re-melted in a furnace, the tailings and the tailings can be used as building materials in the field of construction, can effectively reduce the engineering construction cost, and realize green environmental protection.
Drawings
Fig. 1 is a flow chart of a disposal method for gradient utilization of steel slag.
Detailed Description
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. In case of conflict, the present specification, definitions, will control. When an "amount, concentration, temperature, time, or other value or parameter is expressed as a range, preferred range, or a range bounded by a list of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, a range of 1-50 should be understood to include any number, combination of numbers, or subranges of numbers selected from 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, or 50, and all fractional values between the foregoing integers, such as 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, and 1.9. Regarding sub-ranges, specifically considered are "nested sub-ranges" that extend from any end point within the range. For example, the nested subranges of exemplary ranges 1-50 can include 1-10, 1-20, 1-30, and 1-40 in one direction, or 50-40, 50-30, 50-20, and 50-10 in another direction. "
The application is further illustrated below in connection with specific examples in which various processes and methods, not described in detail, are conventional methods well known in the art. Materials, reagents, devices, instruments, equipment and the like used in the examples described below are commercially available unless otherwise specified.
Example 1
The application provides a disposal method for gradient utilization of steel slag, which comprises the following steps:
s1, pre-crushing: pre-crushing the steel slag by using a jaw crusher, wherein the grain size of the steel slag meets 5mm, and then secondarily crushing the pre-crushed steel slag, and the grain size of the steel slag meets 1mm;
s11: adding potassium sodium tartrate into the secondarily crushed steel slag, continuously stirring and mixing the steel slag for 5min, wherein the mass ratio of the steel slag to the potassium sodium tartrate is 100:0.01;
s2, magnetic separation: screening the secondarily crushed steel slag again, conveying the steel slag with the grain diameter of less than 5mm to a strong magnetic machine, selecting iron fine particles with the Mfe of more than 60%, piling up the iron fine particles in a landing mode, and returning the steel slag with the grain diameter of more than 5mm to a raw material bin for secondary crushing to form a closed loop;
s3, wet grinding: uniformly mixing the magnetic separation residual steel slag with water in a clean water tank, conveying to a wet ball mill, and adjusting the parameters of the ball mill to ensure that the discharge grain size is less than or equal to 1mm;
s4, wet magnetic separation: delivering the discharged materials of the ball mill to a permanent magnet drum type magnetic separator for wet magnetic separation, separating out refined iron slurry, dehydrating by a dehydrating device to obtain refined iron powder products, and precipitating and press-filtering residues to obtain tailings;
s5, precipitation and filter pressing: sieving the residue slurry after magnetic separation to obtain tailings slurry and undersize mineral liquid, and conveying the tailings slurry to a sedimentation tank for sedimentation and filter pressing to obtain tailings;
s6, cake making: and draining undersize mineral liquid and tailings to a sedimentation tank by using a filter press, collecting the tailings slurry through sedimentation and filter-pressing water obtained by filter-pressing water and filter-pressing tailings into a clean water tank through sedimentation, and conveying the sedimented slurry into the filter press by using a slurry pump to prepare mud cakes and piling the mud cakes on the ground.
Wherein, in S2, select that Mfe >60% iron grain is below 5mm, and Mfe is metallic iron, in S1, the breaker of secondary crushing is vertical breaker, and the frequency is 25HZ, and throughput is 5t/h, in S2, strong magnetic machine equipment is magnetic drum iron selector, and magnetic field strength is 6000GS, in S6, upper clear water in the sedimentation tank can be used to wet ball-milling, realizes water resource cyclic utilization.
The obtained fine iron particles had a particle diameter of 1mm, the fine iron powder had a particle diameter of 0.2mm, and the tailings had a particle diameter of 0.2mm.
Example two
The application provides a disposal method for gradient utilization of steel slag, which comprises the following steps:
s1, pre-crushing: pre-crushing the steel slag by using a jaw crusher, wherein the grain size of the steel slag meets 10mm, and then secondarily crushing the pre-crushed steel slag, and the grain size of the steel slag meets 3mm;
s11: adding potassium sodium tartrate into the secondarily crushed steel slag, continuously stirring and mixing the steel slag for 7min, wherein the mass ratio of the steel slag to the potassium sodium tartrate is 100:0.02;
s2, magnetic separation: screening the secondarily crushed steel slag again, conveying the steel slag with the grain diameter of less than 5mm to a strong magnetic machine, selecting iron fine particles with the Mfe of more than 60%, piling up the iron fine particles in a landing mode, and returning the steel slag with the grain diameter of more than 5mm to a raw material bin for secondary crushing to form a closed loop;
s3, wet grinding: uniformly mixing the magnetic separation residual steel slag with water in a clean water tank, conveying to a wet ball mill, and adjusting the parameters of the ball mill to ensure that the discharge grain size is less than or equal to 1mm;
s4, wet magnetic separation: delivering the discharged materials of the ball mill to a permanent magnet drum type magnetic separator for wet magnetic separation, separating out refined iron slurry, dehydrating by a dehydrating device to obtain refined iron powder products, and precipitating and press-filtering residues to obtain tailings;
s5, precipitation and filter pressing: sieving the residue slurry after magnetic separation to obtain tailings slurry and undersize mineral liquid, and conveying the tailings slurry to a sedimentation tank for sedimentation and filter pressing to obtain tailings;
s6, cake making: and draining undersize mineral liquid and tailings to a sedimentation tank by using a filter press, collecting the tailings slurry through sedimentation and filter-pressing water obtained by filter-pressing water and filter-pressing tailings into a clean water tank through sedimentation, and conveying the sedimented slurry into the filter press by using a slurry pump to prepare mud cakes and piling the mud cakes on the ground.
Wherein, in S2, the iron grain with Mfe more than 60% is selected to be below 5mm, mfe is metallic iron, in S1, the secondary crushing crusher is a vertical crusher with the frequency of 25HZ and the processing capacity of 5t/h, in S2, the strong magnetic machine is a magnetic roller iron selecting machine, the magnetic field intensity is 6500GS, in S6, the upper clean water in the sedimentation tank can be used for wet ball milling, thereby realizing the recycling of water resources.
The obtained fine iron particles had a particle diameter of 3mm, the fine iron powder had a particle diameter of 0.4mm, and the tailings had a particle diameter of 0.4mm.
Example III
The application provides a disposal method for gradient utilization of steel slag, which comprises the following steps:
s1, pre-crushing: pre-crushing the steel slag by using a jaw crusher, wherein the grain size of the steel slag meets 30mm, and then secondarily crushing the pre-crushed steel slag, and the grain size of the steel slag meets 4mm;
s11: adding potassium sodium tartrate into the secondarily crushed steel slag, continuously stirring and mixing the steel slag for 9min, wherein the mass ratio of the steel slag to the potassium sodium tartrate is 100:0.02;
s2, magnetic separation: screening the secondarily crushed steel slag again, conveying the steel slag with the grain diameter of less than 5mm to a strong magnetic machine, selecting iron fine particles with the Mfe of more than 60%, piling up the iron fine particles in a landing mode, and returning the steel slag with the grain diameter of more than 5mm to a raw material bin for secondary crushing to form a closed loop;
s3, wet grinding: uniformly mixing the magnetic separation residual steel slag with water in a clean water tank, conveying to a wet ball mill, and adjusting the parameters of the ball mill to ensure that the discharge grain size is less than or equal to 1mm;
s4, wet magnetic separation: delivering the discharged materials of the ball mill to a permanent magnet drum type magnetic separator for wet magnetic separation, separating out refined iron slurry, dehydrating by a dehydrating device to obtain refined iron powder products, and precipitating and press-filtering residues to obtain tailings;
s5, precipitation and filter pressing: sieving the residue slurry after magnetic separation to obtain tailings slurry and undersize mineral liquid, and conveying the tailings slurry to a sedimentation tank for sedimentation and filter pressing to obtain tailings;
s6, cake making: and draining undersize mineral liquid and tailings to a sedimentation tank by using a filter press, collecting the tailings slurry through sedimentation and filter-pressing water obtained by filter-pressing water and filter-pressing tailings into a clean water tank through sedimentation, and conveying the sedimented slurry into the filter press by using a slurry pump to prepare mud cakes and piling the mud cakes on the ground.
Wherein, in S2, the iron grain with Mfe more than 60% is selected to be below 5mm, mfe is metallic iron, in S1, the secondary crushing crusher is a vertical crusher with the frequency of 25HZ and the processing capacity of 5t/h, in S2, the strong magnetic machine equipment is a magnetic roller iron selecting machine, the magnetic field intensity is 7000GS, in S6, the upper clean water in the sedimentation tank can be used for wet ball milling, thereby realizing the recycling of water resources.
The obtained fine iron particles had a particle diameter of 4mm, the fine iron powder had a particle diameter of 0.8mm, and the tailings had a particle diameter of 0.8mm.
Example IV
The application provides a disposal method for gradient utilization of steel slag, which comprises the following steps:
s1, pre-crushing: pre-crushing the steel slag by using a jaw crusher, wherein the grain size of the steel slag meets 40mm, and then secondarily crushing the pre-crushed steel slag, and the grain size of the steel slag meets 5mm;
s11: adding potassium sodium tartrate into the secondarily crushed steel slag, continuously stirring and mixing the steel slag for 10min, wherein the mass ratio of the steel slag to the potassium sodium tartrate is 100:0.03;
s2, magnetic separation: screening the secondarily crushed steel slag again, conveying the steel slag with the grain diameter of less than 5mm to a strong magnetic machine, selecting iron fine particles with the Mfe of more than 60%, piling up the iron fine particles in a landing mode, and returning the steel slag with the grain diameter of more than 5mm to a raw material bin for secondary crushing to form a closed loop;
s3, wet grinding: uniformly mixing the magnetic separation residual steel slag with water in a clean water tank, conveying to a wet ball mill, and adjusting the parameters of the ball mill to ensure that the discharge grain size is less than or equal to 1mm;
s4, wet magnetic separation: delivering the discharged materials of the ball mill to a permanent magnet drum type magnetic separator for wet magnetic separation, separating out refined iron slurry, dehydrating by a dehydrating device to obtain refined iron powder products, and precipitating and press-filtering residues to obtain tailings;
s5, precipitation and filter pressing: sieving the residue slurry after magnetic separation to obtain tailings slurry and undersize mineral liquid, and conveying the tailings slurry to a sedimentation tank for sedimentation and filter pressing to obtain tailings;
s6, cake making: and draining undersize mineral liquid and tailings to a sedimentation tank by using a filter press, collecting the tailings slurry through sedimentation and filter-pressing water obtained by filter-pressing water and filter-pressing tailings into a clean water tank through sedimentation, and conveying the sedimented slurry into the filter press by using a slurry pump to prepare mud cakes and piling the mud cakes on the ground.
Wherein, in S2, select that Mfe >60% iron grain is below 5mm, and Mfe is metallic iron, in S1, the breaker of secondary crushing is vertical breaker, and the frequency is 25HZ, and throughput is 5t/h, in S2, strong magnetic machine equipment is magnetic drum iron selector, and in magnetic field strength was 8000GS, S6, upper clear water in the sedimentation tank can be used to wet ball-milling, realizes water resource cyclic utilization.
The obtained fine iron particles had a particle diameter of 5mm, the fine iron powder had a particle diameter of 1mm, and the tailings had a particle diameter of 1mm.
Comparative example one
A method for disposing steel slag, comprising the steps of:
s1, pre-crushing: pre-crushing the steel slag by using a jaw crusher, wherein the grain size of the steel slag meets 40mm, and then secondarily crushing the pre-crushed steel slag, and the grain size of the steel slag meets 5mm;
s2, magnetic separation: screening the secondarily crushed steel slag again, conveying the steel slag with the grain diameter of less than 5mm to a strong magnetic machine, selecting iron fine particles with the Mfe of more than 60%, piling up the iron fine particles in a landing mode, and returning the steel slag with the grain diameter of more than 5mm to a raw material bin for secondary crushing to form a closed loop;
s3, wet grinding: uniformly mixing the magnetic separation residual steel slag with water in a clean water tank, conveying to a wet ball mill, and adjusting the parameters of the ball mill to ensure that the discharge grain size is less than or equal to 1mm;
s4, wet magnetic separation: delivering the discharged materials of the ball mill to a permanent magnet drum type magnetic separator for wet magnetic separation, separating out refined iron slurry, dehydrating by a dehydrating device to obtain refined iron powder products, and precipitating and press-filtering residues to obtain tailings;
s5, precipitation and filter pressing: sieving the residue slurry after magnetic separation to obtain tailings slurry and undersize mineral liquid, and conveying the tailings slurry to a sedimentation tank for sedimentation and filter pressing to obtain tailings;
s6, cake making: and draining undersize mineral liquid and tailings to a sedimentation tank by using a filter press, collecting the tailings slurry through sedimentation and filter-pressing water obtained by filter-pressing water and filter-pressing tailings into a clean water tank through sedimentation, and conveying the sedimented slurry into the filter press by using a slurry pump to prepare mud cakes and piling the mud cakes on the ground.
Wherein, in S2, select that Mfe >60% iron grain is below 5mm, and Mfe is metallic iron, in S1, the breaker of secondary crushing is vertical breaker, and the frequency is 25HZ, and throughput is 5t/h, in S2, strong magnetic machine equipment is magnetic drum iron selector, and in magnetic field strength was 8000GS, S6, upper clear water in the sedimentation tank can be used to wet ball-milling, realizes water resource cyclic utilization.
The obtained fine iron particles had a particle diameter of 5mm, the fine iron powder had a particle diameter of 1mm, and the tailings had a particle diameter of 1mm.
Comparative example two
A method for disposing steel slag, comprising the steps of:
s1, pre-crushing: pre-crushing the steel slag by using a jaw crusher, wherein the grain size of the steel slag meets 40mm, and then secondarily crushing the pre-crushed steel slag, and the grain size of the steel slag meets 5mm;
s11: adding potassium sodium tartrate into the secondarily crushed steel slag, continuously stirring and mixing the steel slag for 10min, wherein the mass ratio of the steel slag to the potassium sodium tartrate is 100:0.03;
s2, magnetic separation: screening the secondarily crushed steel slag again, conveying the steel slag with the grain diameter lower than 5mm to strong magnetic machine equipment, and selecting iron fine particles with Mfe of more than 60% to stack in a landing mode;
s3, wet grinding: uniformly mixing the magnetic separation residual steel slag with water in a clean water tank, conveying to a wet ball mill, and adjusting the parameters of the ball mill to ensure that the discharge grain size is less than or equal to 1mm;
s4, wet magnetic separation: delivering the discharged materials of the ball mill to a permanent magnet drum type magnetic separator for wet magnetic separation, separating out refined iron slurry, dehydrating by a dehydrating device to obtain refined iron powder products, and precipitating and press-filtering residues to obtain tailings;
s5, precipitation and filter pressing: sieving the residue slurry after magnetic separation to obtain tailings slurry and undersize mineral liquid, and conveying the tailings slurry to a sedimentation tank for sedimentation and filter pressing to obtain tailings;
s6, cake making: and draining undersize mineral liquid and tailings to a sedimentation tank by using a filter press, collecting the tailings slurry through sedimentation and filter-pressing water obtained by filter-pressing water and filter-pressing tailings into a clean water tank through sedimentation, and conveying the sedimented slurry into the filter press by using a slurry pump to prepare mud cakes and piling the mud cakes on the ground.
Wherein, in S2, select that Mfe >60% iron grain is below 5mm, and Mfe is metallic iron, in S1, the breaker of secondary crushing is vertical breaker, and the frequency is 25HZ, and throughput is 5t/h, in S2, strong magnetic machine equipment is magnetic drum iron selector, and in magnetic field strength was 8000GS, S6, upper clear water in the sedimentation tank can be used to wet ball-milling, realizes water resource cyclic utilization.
The obtained fine iron particles had a particle diameter of 5mm, the fine iron powder had a particle diameter of 1mm, and the tailings had a particle diameter of 1mm.
Comparative example three
A method for disposing steel slag, comprising the steps of:
s1, pre-crushing: pre-crushing the steel slag by using a jaw crusher, wherein the grain size of the steel slag meets 40mm, and then secondarily crushing the pre-crushed steel slag, and the grain size of the steel slag meets 5mm;
s11: adding potassium sodium tartrate into the secondarily crushed steel slag, continuously stirring and mixing the steel slag for 10min, wherein the mass ratio of the steel slag to the potassium sodium tartrate is 100:0.03;
s2, magnetic separation: screening the secondarily crushed steel slag again, conveying the steel slag with the grain diameter of less than 5mm to a strong magnetic machine, selecting iron fine particles with the Mfe of more than 60%, piling up the iron fine particles in a landing mode, and returning the steel slag with the grain diameter of more than 5mm to a raw material bin for secondary crushing to form a closed loop;
s3, wet grinding: adding water into the residual steel slag after magnetic separation, uniformly mixing, conveying to a wet ball mill, and adjusting the parameters of the ball mill to ensure that the grain size of discharged materials is less than or equal to 1mm;
s4, wet magnetic separation: delivering the discharged materials of the ball mill to a permanent magnet drum type magnetic separator for wet magnetic separation, separating out refined iron slurry, dehydrating by a dehydrating device to obtain refined iron powder products, and precipitating and press-filtering residues to obtain tailings;
s5, precipitation and filter pressing: sieving the residue slurry after magnetic separation to obtain tailings slurry and undersize mineral liquid, and conveying the tailings slurry to a sedimentation tank for sedimentation and filter pressing to obtain tailings;
s6, cake making: draining the undersize mineral liquid and the tailings filter press to a sedimentation tank, and conveying the sedimentated slurry into the filter press by a slurry pump to prepare a mud cake and piling the mud cake on the ground.
Wherein, in S2, iron fine particles with Mfe of more than 60% are selected to be below 5mm, mfe is metallic iron, in S1, a secondary crushing crusher is a vertical crusher, the frequency is 25HZ, the processing capacity is 5t/h, in S2, the strong magnetic machine equipment is a magnetic roller iron selector, and the magnetic field strength is 8000GS.
The obtained fine iron particles had a particle diameter of 5mm, the fine iron powder had a particle diameter of 1mm, and the tailings had a particle diameter of 1mm.
Comparative example four
A method for disposing steel slag, comprising the steps of:
s1, pre-crushing: pre-crushing the steel slag by using a jaw crusher, wherein the grain size of the steel slag meets 40mm, and then secondarily crushing the pre-crushed steel slag, and the grain size of the steel slag meets 5mm;
s2, magnetic separation: screening the secondarily crushed steel slag again, conveying the steel slag with the grain diameter lower than 5mm to strong magnetic machine equipment, and selecting iron fine particles with Mfe of more than 60% to stack in a landing mode;
s3, wet grinding: adding water into the residual steel slag after magnetic separation, uniformly mixing, conveying to a wet ball mill, and adjusting the parameters of the ball mill to ensure that the grain size of discharged materials is less than or equal to 1mm;
s4, wet magnetic separation: delivering the discharged materials of the ball mill to a permanent magnet drum type magnetic separator for wet magnetic separation, separating out refined iron slurry, dehydrating by a dehydrating device to obtain refined iron powder products, and precipitating and press-filtering residues to obtain tailings;
s5, precipitation and filter pressing: sieving the residue slurry after magnetic separation to obtain tailings slurry and undersize mineral liquid, and conveying the tailings slurry to a sedimentation tank for sedimentation and filter pressing to obtain tailings;
s6, cake making: draining the undersize mineral liquid and the tailings filter press to a sedimentation tank, and conveying the sedimentated slurry into the filter press by a slurry pump to prepare a mud cake and piling the mud cake on the ground.
Wherein, in S2, iron fine particles with Mfe of more than 60% are selected to be below 5mm, mfe is metallic iron, in S1, a secondary crushing crusher is a vertical crusher, the frequency is 25HZ, the processing capacity is 5t/h, in S2, the strong magnetic machine equipment is a magnetic roller iron selector, and the magnetic field strength is 8000GS.
The obtained fine iron particles had a particle diameter of 5mm, the fine iron powder had a particle diameter of 1mm, and the tailings had a particle diameter of 1mm.
The steel slag treated in the above examples one to four and comparative examples one to four was subjected to the results shown in the following table 1, wherein the service lives of the equipment include long (10 years or more), long (7 to 10 years), medium (3 to 7 years), and short (3 years or less):
TABLE 1
According to the table 1, it is obvious that in the first to fourth embodiments, the steel slag is pretreated by the twice crushing process, and the grain size of the steel slag entering the wet ball milling tank is controlled, so that the service life of the equipment is long, and the water consumption can be effectively reduced, the recycling of water resources is realized, and meanwhile, the sewage discharge is avoided due to the arrangement of the clean water tank with the second closed loop;
in the fourth embodiment and the first comparative embodiment, which have the same conditions, since the pretreatment of potassium sodium tartrate of S11 is not performed in the first comparative embodiment, the water consumption percentage is increased, the service life of the apparatus is also reduced due to the increase of the working frequency, and the recovery rate after the steel slag is treated is reduced;
in the fourth embodiment and the second comparative embodiment, the second comparative embodiment does not return the steel slag to the raw material bin for secondary crushing to form a closed loop, so that the service life of equipment is reduced, and the recovery rate of treating the steel slag is also reduced;
in the fourth embodiment and the third comparative embodiment, the third comparative embodiment does not perform closed circulating water in the clean water tank, so that the water consumption ratio of the steel slag treatment is obviously increased, and meanwhile, the recovery rate of the steel slag is partially influenced;
in the fourth embodiment and the fourth comparative embodiment, the pretreatment of potassium sodium tartrate of S11 is not performed in the fourth comparative embodiment, the steel slag is not returned to the raw material bin to be secondarily crushed to form a closed loop, and the closed circulating water is not performed in the clean water tank, so that the water consumption percentage is improved, the service life of the equipment is also reduced due to the increase of the working frequency, the recovery rate of the steel slag after being treated is reduced, the overall treatment efficiency is poor, the service life of the equipment is low, and the water consumption is high.
In summary, the application crushes the steel slag twice in advance, controls the grain diameter of the steel slag to be in the range of 0-5 mm, carries out wet ball milling on the steel slag with unqualified iron content in the magnetic separation process, improves the recovery efficiency of metals, simultaneously arranges the twice crushing process to reduce the grain diameter of the steel slag entering the ball mill, reduces the loss of grinding devices, reduces the energy consumption, produces 0-5 mm fine iron grain, 0-1 mm tailings, fine iron powder and tailings by each process of treating the steel slag, the fine iron grain and the fine iron powder can be directly and externally pinned, the tailings can be used as admixture to replace part of sand and stone fine aggregate, the tailings contain active substances such as calcium oxide with higher components and the like, can be used as cementing materials to replace part of cement and other materials, and greatly reduces the construction cost of concrete engineering.
The present application is not limited to the above-mentioned embodiments, and any person skilled in the art, based on the technical solution of the present application and the inventive concept thereof, can be replaced or changed within the scope of the present application.
Claims (6)
1. The disposal method for gradient utilization of the steel slag is characterized by comprising the following steps of:
s1, pre-crushing: pre-crushing the steel slag by using a jaw crusher, wherein the grain size of the steel slag meets 0-40 mm, and then secondarily crushing the pre-crushed steel slag, and the grain size of the steel slag meets 0-5 mm;
s11: adding potassium sodium tartrate into the secondarily crushed steel slag, and continuously stirring and mixing the steel slag for 5-10 min, wherein the mass ratio of the steel slag to the potassium sodium tartrate is 100:0.01-0.03;
s2, magnetic separation: screening the secondarily crushed steel slag again, conveying the steel slag with the grain diameter of less than 5mm to a strong magnetic machine, selecting iron fine particles with Mfe of more than 60%, piling up the iron fine particles in a landing mode, and returning the steel slag with the grain diameter of more than 5mm to a raw material bin for secondary crushing to form a closed loop;
s3, wet grinding: uniformly mixing the magnetic separation residual steel slag with water in a clean water tank, conveying to a wet ball mill, and adjusting the parameters of the ball mill to ensure that the discharge grain size is less than or equal to 1mm;
s4, wet magnetic separation: delivering the discharged materials of the ball mill to a permanent magnet drum type magnetic separator for wet magnetic separation, separating out refined iron slurry, dehydrating by a dehydrating device to obtain refined iron powder products, and precipitating and press-filtering residues to obtain tailings;
s5, precipitation and filter pressing: sieving the residue slurry after magnetic separation to obtain tailings slurry and undersize mineral liquid, and conveying the tailings slurry to a sedimentation tank for sedimentation and filter pressing to obtain tailings;
s6, cake making: draining undersize mineral liquid and tailings to a sedimentation tank by a filter press, collecting the tailings slurry through sedimentation and filter-pressing water obtained by filter-pressing water and filter-pressing tailings slurry into a clean water tank by sedimentation, and conveying the sedimented slurry into the filter press by a slurry pump to prepare a mud cake for standing and piling;
the grain diameter of the obtained fine iron grains is 0-5 mm, the grain diameter of the fine iron powder is 0-1 mm, and the grain diameter of the tailings is 0-1 mm.
2. The method for disposing of steel slag according to claim 1, wherein in S2, iron grains with Mfe >60% are selected to be 5mm or less, and Mfe is metallic iron.
3. The method for disposing of steel slag gradient utilization according to claim 1, wherein in S1, the secondary crushing crusher is a vertical crusher, the frequency is 25HZ, and the disposal capacity is 5t/h.
4. The method for disposing of steel slag gradient utilization according to claim 1, wherein in S2, the ferromagnetic machine is a magnetic drum iron selector, and the magnetic field strength is 6000-8000 GS.
5. The disposal method for gradient utilization of steel slag according to claim 1, wherein in S6, clean water at the upper layer in the sedimentation tank can be used for wet ball milling, so as to realize water resource recycling.
6. The method for disposing of steel slag cascade utilization according to claim 1, wherein the obtained fine iron particles have a particle size of 3mm, the fine iron powder has a particle size of 0.5mm, and the tailings have a particle size of 0.5mm.
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