CN114273387A - Method for recovering carbon and reducing iron from water-quenched slag - Google Patents
Method for recovering carbon and reducing iron from water-quenched slag Download PDFInfo
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- CN114273387A CN114273387A CN202111596187.2A CN202111596187A CN114273387A CN 114273387 A CN114273387 A CN 114273387A CN 202111596187 A CN202111596187 A CN 202111596187A CN 114273387 A CN114273387 A CN 114273387A
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention discloses a method for recovering carbon and reducing iron from water-quenched slag, which belongs to the technical field of comprehensive treatment of water-quenched slag and comprises the following steps: step one, crushing and screening: feeding the water-quenched slag into a jaw crusher for crushing, and feeding the water-quenched slag with the particle size of less than or equal to 10mm into a dry magnetic separator through a vibrating feeder and a vibrating screen; step two, magnetic separation dry polishing: feeding the crushed water-quenched slag into a dry magnetic separator to obtain low-iron fine powder and coal slag; step three, ball milling: conveying the low-iron fine powder into a ball mill for grinding, and entering a magnetic separation process when the granularity is consistent; step four, magnetic separation: adding water into the ground iron powder according with the granularity, sorting by using a magnetic pulley, overflowing and conveying to a wet magnetic separator for magnetic separation, wherein the magnetic part is high-iron fine powder, and the rest is iron-sorting tail mud; step five, spiral grading: the high-iron fine powder enters a spiral classifier to separate the reducing iron powder and the iron separation tail mud.
Description
Technical Field
The invention belongs to the technical field of comprehensive treatment of water-quenched slag, and particularly relates to a method for recovering carbon and reducing iron from water-quenched slag.
Background
The water-quenched slag is a kind of granular slag with rough surface, porous, light and crisp texture and easy to break, and is a by-product of metallurgical industry, such as slag for producing water-quenched slag, etc. the solid matter formed by granulating the particles discharged from rotary kiln is the water-quenched slag of rotary kiln. In the rotary kiln operation process, the incomplete combustion residual carbon still exists in the water quenching slag caused by insufficient fuel combustion, the fixed carbon content in the water quenching slag is about 10-30%, and the difference is large according to the selection of the combustion process. Besides fixed carbon, the iron content is about 15% -60%, wherein the iron content is determined by the iron content in the raw materials. In addition, it also contains calcium oxide, magnesium oxide, silicon dioxide, and trace amounts of metal elements such as lead, zinc, silver, and copper. At present, the method for treating the rotary kiln water-quenched slag mainly comprises the steps of selling the rotary kiln water-quenched slag to a cement plant, selecting iron to produce iron fine powder or entering an internal sintering system of an iron and steel enterprise for sintering, wherein the iron content is low, and the iron fine powder is produced by iron selection or enters the internal sintering system of the iron and steel enterprise. The water-quenched slag with low iron content is directly sold to a cement plant as a cement raw material, so that on one hand, coal in the water-quenched slag is not recovered, and the waste of carbon resources is caused; on the other hand, the iron in the waste liquid is not recycled, so that the waste of iron resources is caused.
Disclosure of Invention
The invention aims to provide a method for recovering carbon and reducing iron from water-quenched slag, which aims to solve the problems in the background art.
The purpose of the invention can be realized by the following technical scheme:
a method for recovering carbon and reducing iron from water-quenched slag comprises the following steps:
step one, crushing and screening: feeding the water-quenched slag into a jaw crusher for crushing, and feeding the water-quenched slag with the particle size of less than or equal to 10mm into a dry magnetic separator through a vibrating feeder and a vibrating screen; returning the water-quenched slag with the particle size larger than 10mm to a jaw crusher through a vibrating screen for re-crushing;
step two, magnetic separation dry polishing: after the crushed water-quenched slag enters a dry magnetic separator, adsorbing iron ore with strong magnetism on a belt of a magnetic roller and collecting to obtain low-iron fine powder; the non-magnetic coal cinder is separated from the surface of the belt under the action of centrifugal force and gravity, and the magnetic field intensity of the magnetic separator is 3900-4000 gausses; the water-quenched slag is subjected to magnetic separation and dry polishing to obtain coal slag (the carbon heat value can reach 4000 kilocalories), the coal slag can be returned to the rotary kiln to be used as fuel, and the obtained low-iron fine powder enters a ball milling process;
step three, ball milling: transporting the low-iron fine powder into a ball mill for grinding, grinding by taking water as a medium in the ball milling process, and carrying out high-frequency screening separation, wherein the ground iron powder with the granularity of less than or equal to 150 meshes enters a next-stage magnetic separation process, and the ground iron powder with the granularity of more than 150 meshes returns to the ball mill for grinding again;
step four, magnetic separation: adding water into the grinding iron powder according with the granularity to adjust the grinding iron powder into grinding iron powder ore pulp with the ore pulp mass concentration of 30-40%, sorting the grinding iron powder ore pulp by using a magnetic pulley, overflowing the grinding iron powder ore pulp to be sent to a wet magnetic separator for magnetic separation by using a concentration pump, wherein the magnetic part is high-iron fine powder, and the rest part is iron-selecting tailing;
step five, spiral grading: the high-iron fine powder enters a spiral classifier to further separate the reducing iron powder and the iron separation tailings, a low-speed rotating spiral can play a certain stirring role, ore pulp is stirred, the iron separation tailings are suspended on the ore pulp to form overflow, the overflow is overflowed from an overflow weir at the end face of a water tank, and the reducing iron powder is deposited at the bottom of the tank and is conveyed to an outlet by the spiral to be discharged.
Further, the iron-selecting tail mud generated by magnetic separation and spiral classification is processed by a filter press, the water content is 8-12%, and the iron-selecting tail mud can be used as a cement raw material for preparing cement.
Furthermore, the rotating speed of the wet magnetic separator is 60-180r/min, the washing water pressure is 0.1-0.15MPa, the washing water amount is 0.5-1t/h, and the magnetic field intensity is 500-800 Gauss.
The invention has the beneficial effects that:
the invention aims at the problem that the existing enterprises directly sell the water-quenched slag with low iron content to a cement plant as a cement raw material, on one hand, coal in the water-quenched slag is not recovered, and the waste of carbon resources is caused; on the other hand, the method takes the problem that iron in the coal slag is not recycled to cause waste of iron resources as a starting point, three products, namely coal cinder, reduced iron powder and iron separation tail mud, are separated through the process steps of crushing, screening, magnetic separation, dry casting, ball milling, magnetic separation and spiral classification, so that the aim of comprehensively utilizing resources is fulfilled, the process is simple, no new impurities are introduced, no organic separation reagent is adopted, no organic wastewater is generated, the method is environment-friendly and healthy, and the enterprise benefit is improved to a certain extent.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a flow chart of a method for recovering carbon and reducing iron from water-quenched slag according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1, the method of the present invention is used for treating the water-quenched slag in an industrial park of marco city in Hunan province, wherein the contents of copper, lead, zinc, arsenic, iron and carbon in the water-quenched slag are respectively 0.03%, 0.09%, 0.1%, 0.07%, 16.60% and 13.6%, and the method comprises the following steps:
step one, crushing and screening: feeding the water-quenched slag into a jaw crusher for crushing, and feeding the water-quenched slag with the particle size of less than or equal to 10mm into a dry magnetic separator through a vibrating feeder and a vibrating screen; returning the water-quenched slag with the particle size larger than 10mm to a jaw crusher through a vibrating screen for re-crushing;
step two, magnetic separation dry polishing: after the crushed water-quenched slag enters a dry magnetic separator, adsorbing iron ore with strong magnetism on a belt of a magnetic roller and collecting to obtain low-iron fine powder; the nonmagnetic cinder is separated from the surface of the belt under the action of centrifugal force and gravity, and the magnetic field intensity of the magnetic separator is 3900 gauss; the water quenching slag is subjected to magnetic separation and dry polishing to obtain coal slag which can be returned to the rotary kiln to be used as fuel, and the obtained low-iron fine powder enters a ball milling process;
step three, ball milling: transporting the low-iron fine powder into a ball mill for grinding, grinding by taking water as a medium in the ball milling process, and carrying out high-frequency screening separation, wherein the ground iron powder with the granularity of less than or equal to 150 meshes enters a next-stage magnetic separation process, and the ground iron powder with the granularity of more than 150 meshes returns to the ball mill for grinding again;
step four, magnetic separation: adding water into the grinding iron powder according with the granularity to adjust the grinding iron powder into grinding iron powder ore pulp with the ore pulp mass concentration of 30 percent, sorting the grinding iron powder ore pulp by using a magnetic pulley, overflowing the grinding iron powder ore pulp to be sent to a wet magnetic separator for magnetic separation by a concentration pump, wherein the magnetic part is high-iron fine powder, and the rest part is iron-selecting tailing sludge;
step five, spiral grading: the high-iron fine powder enters a spiral classifier to further separate the reducing iron powder and the iron separation tailings, a low-speed rotating spiral can play a certain stirring role, ore pulp is stirred, the iron separation tailings are suspended on the ore pulp to form overflow, the overflow is carried out by an overflow weir at the end face of a water tank, and the reducing iron powder is deposited at the bottom of the tank and is conveyed to an outlet by the spiral to be discharged.
After overflowing from the overflow weir on the end face of the water tank, the iron-separation tail mud is treated by a filter to enable the water content of the iron-separation tail mud to be 8%, and the iron-separation tail mud generated by magnetic separation and spiral classification can be used as a cement raw material to prepare cement.
Wherein the rotating speed of the wet magnetic separator is 60 r/min, the washing water pressure is 0.1MPa, the washing water quantity is 0.5t/h, and the magnetic field intensity is 500 gauss.
Example 2
The method is adopted to treat the water-quenched slag in an industrial park of Louzu city in Hunan province, the contents of copper, lead, zinc, arsenic, iron and carbon in the water-quenched slag are respectively 0.03%, 0.09%, 0.1%, 0.07%, 16.60% and 13.6%, and the method comprises the following steps:
step one, crushing and screening: feeding the water-quenched slag into a jaw crusher for crushing, and feeding the water-quenched slag with the particle size of less than or equal to 10mm into a dry magnetic separator through a vibrating feeder and a vibrating screen; returning the water-quenched slag with the particle size larger than 10mm to a jaw crusher through a vibrating screen for re-crushing;
step two, magnetic separation dry polishing: after the crushed water-quenched slag enters a dry magnetic separator, adsorbing iron ore with strong magnetism on a belt of a magnetic roller and collecting to obtain low-iron fine powder; the nonmagnetic cinder is separated from the surface of the belt under the action of centrifugal force and gravity, and the magnetic field intensity of the magnetic separator is 3950 Gauss; the water quenching slag is subjected to magnetic separation and dry polishing to obtain coal slag which can be returned to the rotary kiln to be used as fuel, and the obtained low-iron fine powder enters a ball milling process;
step three, ball milling: transporting the low-iron fine powder into a ball mill for grinding, grinding by taking water as a medium in the ball milling process, and carrying out high-frequency screening separation, wherein the ground iron powder with the granularity of less than or equal to 150 meshes enters a next-stage magnetic separation process, and the ground iron powder with the granularity of more than 150 meshes returns to the ball mill for grinding again;
step four, magnetic separation: adding water into the grinding iron powder with the granularity, adjusting the mixture into grinding iron powder ore pulp with the ore pulp mass concentration of 35%, sorting the grinding iron powder ore pulp by using a magnetic pulley, overflowing the grinding iron powder ore pulp to a wet magnetic separator for magnetic separation by using a concentration pump, wherein the magnetic part is high-iron fine powder, and the rest part is iron-selecting tailing;
step five, spiral grading: the high-iron fine powder enters a spiral classifier to further separate the reducing iron powder and the iron separation tailings, a low-speed rotating spiral can play a certain stirring role, ore pulp is stirred, the iron separation tailings are suspended on the ore pulp to form overflow, the overflow is carried out by an overflow weir at the end face of a water tank, and the reducing iron powder is deposited at the bottom of the tank and is conveyed to an outlet by the spiral to be discharged.
After overflowing from the overflow weir on the end face of the water tank, the iron-separation tail mud is treated by a filter to ensure that the water content is 10 percent, and the iron-separation tail mud generated by magnetic separation and spiral classification can be used as a cement raw material to prepare cement.
Wherein the rotating speed of the wet magnetic separator is 80r/min, the washing water pressure is 0.12MPa, the washing water quantity is 0.8t/h, and the magnetic field intensity is 700 gauss.
Example 3
The method is adopted to treat the water-quenched slag in an industrial park of Louzu city in Hunan province, the contents of copper, lead, zinc, arsenic, iron and carbon in the water-quenched slag are respectively 0.03%, 0.09%, 0.1%, 0.07%, 16.60% and 13.6%, and the method comprises the following steps:
step one, crushing and screening: feeding the water-quenched slag into a jaw crusher for crushing, and feeding the water-quenched slag with the particle size of less than or equal to 10mm into a dry magnetic separator through a vibrating feeder and a vibrating screen; returning the water-quenched slag with the particle size larger than 10mm to a jaw crusher through a vibrating screen for re-crushing;
step two, magnetic separation dry polishing: after the crushed water-quenched slag enters a dry magnetic separator, adsorbing iron ore with strong magnetism on a belt of a magnetic roller and collecting to obtain low-iron fine powder; the non-magnetic coal cinder is separated from the surface of the belt under the action of centrifugal force and gravity, and the magnetic field intensity of the magnetic separator is 4000 gauss; the water quenching slag is subjected to magnetic separation and dry polishing to obtain coal slag which can be returned to the rotary kiln to be used as fuel, and the obtained low-iron fine powder enters a ball milling process;
conveying the low-iron fine powder into a ball mill for grinding, grinding by taking water as a medium in the ball milling process, and performing high-frequency screening separation, wherein the ground iron powder with the granularity of less than or equal to 150 meshes enters a next-stage magnetic separation process, and the ground iron powder with the granularity of more than 150 meshes returns to the ball mill for grinding again;
step four, magnetic separation: adding water into the grinding iron powder according with the granularity to adjust the grinding iron powder into grinding iron powder ore pulp with the ore pulp mass concentration of 30-40%, sorting the grinding iron powder ore pulp by using a magnetic pulley, overflowing the grinding iron powder ore pulp to be sent to a wet magnetic separator for magnetic separation by using a concentration pump, wherein the magnetic part is high-iron fine powder, and the rest part is iron-selecting tailing;
step five, spiral grading: the high-iron fine powder enters a spiral classifier to further separate the reducing iron powder and the iron separation tailings, a low-speed rotating spiral can play a certain stirring role, ore pulp is stirred, the iron separation tailings are suspended on the ore pulp to form overflow, the overflow is carried out by an overflow weir at the end face of a water tank, and the reducing iron powder is deposited at the bottom of the tank and is conveyed to an outlet by the spiral to be discharged.
After overflowing from the overflow weir on the end face of the water tank, the iron-separation tail mud is treated by a filter to ensure that the water content is 12 percent, and the iron-separation tail mud generated by magnetic separation and spiral classification can be used as a cement raw material to prepare cement.
Wherein the rotating speed of the wet magnetic separator is 180r/min, the washing water pressure is 0.15MPa, the washing water quantity is 1t/h, and the magnetic field intensity is 800 gauss.
The reduced iron powders and the briquettes obtained in examples 1 to 3 were dried and then weighed, and the recovery rate (%) of reduced iron powders and the recovery rate (%) of carbon were calculated, and the test results are shown in table 1:
TABLE 1
| Item | Reduced iron powder recovery (%) | Carbon recovery (%) |
| Example 1 | 93.2 | 62.5 |
| Example 2 | 92.9 | 61.9 |
| Example 3 | 93.5 | 62.1 |
As can be seen from table 1, the recovery rate of reduced iron powder from water-quenched slag by the methods described in examples 1 to 3 was about 93%, the carbon recovery rate was 60% or more, and the comprehensive utilization rate of water-quenched slag could be effectively improved.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A method for recovering carbon and reducing iron from water-quenched slag is characterized by comprising the following steps:
step one, crushing and screening: crushing the water-quenched slag by a jaw crusher to obtain crushed slag, screening the crushed slag, and separating the crushed slag with the particle size of less than or equal to 10mm by a dry magnetic separator to obtain low-iron fine powder and coal slag;
step two, ball milling: conveying the low-iron fine powder into a ball mill for grinding to obtain ground iron powder, screening to obtain the ground iron powder with the granularity of less than or equal to 150 meshes and the ground iron powder with the granularity of more than 150 meshes, adding water into the ground iron powder with the granularity of less than or equal to 150 meshes to adjust the ground iron powder into ground iron powder pulp, sorting the ground iron powder pulp by using a magnetic pulley, overflowing the ground iron powder pulp to a wet magnetic separator for magnetic separation by using a concentration pump, wherein the magnetic part is high-iron fine powder, and the rest part is iron-selecting tail mud;
step three, spiral grading: and (3) feeding the high-iron fine powder into a spiral classifier, and separating the reducing iron powder and the iron separation tail mud.
2. The method for recovering carbon and reducing iron from water-quenched slag according to claim 1, wherein the crushed slag with the particle size of more than 10mm after screening is returned to the jaw crusher through a vibrating screen for re-crushing.
3. The method for recovering carbon and reducing iron from water-quenched slag as claimed in claim 1, wherein the magnetic field strength of the dry magnetic separator is 3900-4000 gausses.
4. The method for recovering carbon and reducing iron from water-quenched slag according to claim 1, wherein the ground iron powder with the particle size of more than 150 meshes is returned to the ball mill for grinding again.
5. The method for recovering carbon and reducing iron from water-quenched slag according to claim 1, wherein the mass concentration of the ground iron powder ore pulp is 30-40%.
6. The method for recovering carbon and reducing iron from water-quenched slag as claimed in claim 1, wherein the rotation speed of the wet magnetic separator is 60-180r/min, the washing water pressure is 0.1-0.15MPa, the washing water amount is 0.5-1t/h, and the magnetic field strength is 500-800 gauss.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115156243A (en) * | 2022-07-18 | 2022-10-11 | 中国地质科学院郑州矿产综合利用研究所 | Recovery process of anode and cathode materials of waste battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103131861A (en) * | 2013-03-12 | 2013-06-05 | 山东乾舜矿冶科技股份有限公司 | Integrated utilization method of ironmaking dust removal ash |
| CN104911356A (en) * | 2014-03-13 | 2015-09-16 | 北京事竟成有色金属研究所 | Comprehensive recovery technology of solid waste gas ash and zinc-containing ferrovanadium slag |
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- 2021-12-24 CN CN202111596187.2A patent/CN114273387A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103131861A (en) * | 2013-03-12 | 2013-06-05 | 山东乾舜矿冶科技股份有限公司 | Integrated utilization method of ironmaking dust removal ash |
| CN104911356A (en) * | 2014-03-13 | 2015-09-16 | 北京事竟成有色金属研究所 | Comprehensive recovery technology of solid waste gas ash and zinc-containing ferrovanadium slag |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115156243A (en) * | 2022-07-18 | 2022-10-11 | 中国地质科学院郑州矿产综合利用研究所 | Recovery process of anode and cathode materials of waste battery |
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