CN111519022B - Method and system for preparing sintering raw material by using cold-rolled alkaline mud - Google Patents
Method and system for preparing sintering raw material by using cold-rolled alkaline mud Download PDFInfo
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- CN111519022B CN111519022B CN202010515460.3A CN202010515460A CN111519022B CN 111519022 B CN111519022 B CN 111519022B CN 202010515460 A CN202010515460 A CN 202010515460A CN 111519022 B CN111519022 B CN 111519022B
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
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Abstract
The invention discloses a method and a system for preparing sintering raw materials by using cold rolling alkaline mud, wherein the method comprises the following steps: starting an induced draft fan to keep the interior of the double-stage double-shaft digester in a micro negative pressure state; respectively continuously and quantitatively inputting cold-rolled alkaline mud, quick lime and fly ash into the two-stage double-shaft slaker through a double-shaft screw conveyor, a first single-shaft screw conveyor and a second single-shaft screw conveyor to be mixed to obtain a mixture; conveying the mixture to a proportioning bin by using a closed belt conveyor; and conveying the mixture in the proportioning bin to a rotary mixer by using a disk feeder, and mixing the mixture with preset raw materials to prepare a sintering raw material. The application has the advantages that: (1) continuous closed conveying and quantitative adding of the cold-rolled alkali mud are realized; (2) the closed material conveying and pretreatment technology is environment-friendly; (3) the accurate quantification of the cold rolling alkali mud enables the water content after mixing to be easily controlled in a stable region.
Description
Technical Field
The invention relates to the technical field of harmless treatment and resource utilization of ferrous metallurgy hazardous waste, in particular to a method and a system for preparing a sintering raw material by using cold rolling alkaline mud.
Background
Cold-rolled sludge (waste code 336-. The main chemical components of the alkaline mud which accounts for 40% of the cold-rolled sludge are CaO (17%), AI2O3 (13%), TFe (13%), SiO2 (2.4%), C (2.4%), MgO (2.3%) and the like, the adverse effect on the quality of a sintering ore is extremely small, the alkaline mud is most suitable for sintering ingredients in all cold-rolled sludge, the synergistic effect of treating wastes with wastes is achieved by utilizing dust removal ash, a safe and effective way is developed for treating hazardous wastes in the synergistic production process of steel enterprises, and the corresponding cost for treating the hazardous wastes is avoided.
However, at present, two key problems need to be solved by utilizing a sintering production process to dispose cold-rolled alkaline mud: firstly, the continuous conveying and the quantification of the sludge; and secondly, the adaptability requirement of homogenizing mixed materials in the sintering process is met.
Disclosure of Invention
The invention aims to provide a method and a system for preparing a sintering raw material by using cold-rolled alkaline mud, which aim to solve the technical problems that the sludge conveying cannot be quantitative, the raw materials in a sintering process are not uniformly mixed and the like in the prior art.
To this end, the invention proposes a method for formulating a sintering feedstock using cold rolling soda ash, said method comprising the steps of:
starting an induced draft fan to keep the interior of the double-stage double-shaft digester in a micro negative pressure state;
respectively continuously and quantitatively inputting cold-rolled alkaline mud, quick lime and fly ash into the two-stage double-shaft slaker through a double-shaft screw conveyor, a first single-shaft screw conveyor and a second single-shaft screw conveyor to be mixed to obtain a mixture;
conveying the mixture to a proportioning bin by using a closed belt conveyor;
and conveying the mixture in the proportioning bin to a rotary mixer by using a disk feeder, and mixing the mixture with preset raw materials to prepare a sintering raw material.
Preferably, the mass ratio of the quick lime to the fly ash is 1 to (0.3-1).
Preferably, the mass ratio of the quick lime to the dedusting ash is 1: 0.5.
Preferably, the ratio of the mass of the cold-rolled alkali mud to the total mass of the quick lime and the fly ash is 1 to (0.3-0.8).
Preferably, the mixing time of the cold-rolled alkaline mud, the quicklime and the dedusting ash is 3-6 minutes.
Preferably, the water content of the dedusting ash is less than or equal to 0.2%.
Preferably, the mass fraction of the mixture in the sintering raw material is 0.1-3%.
The invention also provides a system for preparing sintering raw materials by using cold rolling alkali mud, which is used for the method for preparing sintering raw materials by using cold rolling alkali mud, and comprises the following steps: first unipolar screw conveyer, second unipolar screw conveyer, biax screw conveyer, doublestage biax digestion machine, draught fan, airtight band conveyer, proportioning bins, disk feeder and rotary mixing machine, wherein, first unipolar screw conveyer the second unipolar screw conveyer with biax screw conveyer respectively with doublestage biax digestion machine is connected, doublestage biax digestion machine respectively with the draught fan with airtight band conveyer connects, airtight band conveyer with the proportioning bins is connected, the proportioning bins with the disk feeder is connected, the disk feeder with rotary mixing machine connects.
Compared with the prior art, the invention has the advantages that:
the technical difficulties of continuous closed conveying and quantitative adding of cold-rolled alkali mud are broken through, and the requirement of raw material homogenization is completely met; in addition, the dedusting ash is used for pretreating the cold-rolled alkaline mud, so that a new disposal mode is added for the ferrous metallurgy dedusting ash.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic diagram of a system for formulating a sintering material using cold rolling soda ash in accordance with the present invention;
in the figure: 1-a first single-shaft screw conveyor; 2-a second single-shaft screw conveyor; 3-a twin screw conveyor; 4-a two-stage double-shaft digester; 5-a draught fan; 6-closed belt conveyor; 7-a proportioning bin; 8-a disk feeder; 9-rotary mixer.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, 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 invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
Referring to fig. 1, in an embodiment of the present application, the present invention provides a method for preparing a sintering material using cold rolling alkaline sludge, the method comprising the steps of:
starting the induced draft fan 5 to keep the interior of the double-stage double-shaft digester 4 in a micro negative pressure state;
respectively continuously and quantitatively inputting cold-rolled alkaline mud, quick lime and fly ash into the two-stage double-shaft slaker 4 through the double-shaft screw conveyor 3, the first single-shaft screw conveyor 1 and the second single-shaft screw conveyor 2 for mixing to obtain a mixture;
conveying the mixture into a proportioning bin 7 by using a closed belt conveyor 6;
and conveying the mixture in the proportioning bin 7 to a rotary mixer 9 by using a disk feeder 8, and mixing the mixture with preset raw materials to prepare a sintering raw material.
In the embodiment of the application, the mass ratio of the quick lime to the dedusting ash is 1 to (0.3-1).
Preferably, the mass ratio of the quick lime to the dedusting ash is 1: 0.5.
In the embodiment of the application, the ratio of the mass of the cold-rolled alkaline mud to the total mass of the quick lime and the dedusting ash is 1 to (0.3-0.8).
In the embodiment of the application, the mixing time of the cold rolling alkali mud, the quick lime and the dedusting ash is 3-6 minutes.
In the embodiment of the application, the water content of the dedusting ash is less than or equal to 0.2%.
In the embodiment of the application, the water content of the mixture is 35-45%.
In the embodiment of the application, the mass fraction of the mixture in the sintering raw material is 0.1-3%.
In an embodiment of the present application, as shown in fig. 1, the present application further provides a system for preparing a sintering material using cold rolling alkaline mud, the system being used in the method for preparing a sintering material using cold rolling alkaline mud as described above, the system comprising: first unipolar screw conveyer 1, second unipolar screw conveyer 2, biax screw conveyer 3, doublestage biax digestion machine 4, draught fan 5, airtight band conveyer 6, proportioning bins 7, disk feeder 8 and rotary mixing machine 9, wherein, first unipolar screw conveyer 1 second unipolar screw conveyer 2 with biax screw conveyer 3 respectively with doublestage biax digestion machine 4 is connected, doublestage biax digestion machine 4 respectively with draught fan 5 with airtight band conveyer 6 is connected, airtight band conveyer 6 with proportioning bins 7 is connected, proportioning bins 7 with disk feeder 8 is connected, disk feeder 8 with rotary mixing machine 9 is connected.
The present application will be described in detail with reference to examples.
Example 1
Quantitatively adding three materials of cold-rolled alkali mud, quicklime and fly ash into a two-stage double-shaft slaker 4 with a micro negative pressure respectively, and quantitatively adding the quicklime and the fly ash into the slaker through a first single-shaft screw conveyor 1 and a second single-shaft screw conveyor 2 respectively; the cold-rolled alkaline mud is continuously and quantitatively added through a double-shaft screw conveyor 3. The micro-negative pressure in the double-stage double-shaft slaker 4 is kept by the draught fan 5, which is beneficial to the uniform mixing of materials, the mass ratio of the added quick lime to the added dust is 1: 0.5, the mass ratio of the cold-rolled alkali mud to the total amount of the quick lime and the dust is 1: 0.3, the mixing time of the three materials in the double-stage double-shaft slaker 4 with the micro-negative pressure is controlled to be 3-6 minutes, the total water content of the dispersed cold-rolled alkali mud is 45%, then the mixture is sent to the proportioning bin 7 for temporary storage by the closed belt conveyor 6, and finally, the mixture is discharged quantitatively by the disc feeder 8 and mixed with other raw materials in the rotary mixer 9 into a sintering raw material according to the mass ratio of 0.1% by a single stable chemical composition.
Example 2
Quantitatively adding three materials of cold-rolled alkali mud, quicklime and fly ash into a two-stage double-shaft slaker 4 with a micro negative pressure respectively, and quantitatively adding the quicklime and the fly ash into the slaker through a first single-shaft screw conveyor 1 and a second single-shaft screw conveyor 2 respectively; the cold-rolled alkaline mud is continuously and quantitatively added through a double-shaft screw conveyor 3. The micro-negative pressure in the double-stage double-shaft slaker 4 is kept by the draught fan 5, which is beneficial to the uniform mixing of materials, the mass ratio of the added quick lime to the dust removal ash is 1: 0.5, the mass ratio of the cold-rolled alkali mud to the total amount of the quick lime and the dust removal ash is 1: 0.5, the mixing time of the three materials in the double-stage double-shaft slaker 4 with the micro-negative pressure is controlled within 3-6 minutes, the total water content of the dispersed cold-rolled alkali mud is 40%, then the mixture is sent to the proportioning bin 7 for temporary storage by the closed belt conveyor 6, and finally, the mixture is discharged quantitatively by the disc feeder 8 and mixed with other raw materials in the rotary mixer 9 to form a sintering raw material according to the mass ratio of 0.5% by a single stable chemical composition.
Example 3
Quantitatively adding three materials of cold-rolled alkali mud, quicklime and fly ash into a two-stage double-shaft slaker 4 with a micro negative pressure respectively, and quantitatively adding the quicklime and the fly ash into the slaker through a first single-shaft screw conveyor 1 and a second single-shaft screw conveyor 2 respectively; the cold-rolled alkaline mud is continuously and quantitatively added through a double-shaft screw conveyor 3. The micro-negative pressure in the double-stage double-shaft slaker 4 is kept by the draught fan 5, which is beneficial to the uniform mixing of materials, the mass ratio of the added quick lime to the dust removal ash is 1: 0.5, the mass ratio of the cold-rolled alkali mud to the total amount of the quick lime and the dust removal ash is 1: 0.8, the mixing time of the three materials in the double-stage double-shaft slaker 4 with the micro-negative pressure is controlled within 3-6 minutes, the total water content of the dispersed cold-rolled alkali mud is 35%, then the mixture is sent to the proportioning bin 7 for temporary storage by the closed belt conveyor 6, and finally, the mixture is discharged quantitatively by the disc feeder 8 and mixed with other raw materials in the rotary mixer 9 to form a sintering raw material according to the mass ratio of 3% by a single stable chemical composition.
The method and the system for preparing the sintering raw material by using the cold rolling alkaline mud have the advantages that: (1) continuous closed conveying and quantitative adding of the cold-rolled alkali mud are realized; (2) the closed material conveying and pretreatment technology is environment-friendly; (3) the accurate quantification of the cold rolling alkali mud enables the water content after mixing to be easily controlled to be about 40% in a stable interval.
Finally, it should also be noted that 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.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (3)
1. A method for preparing a sintering raw material by using cold rolling alkaline mud, which is characterized by comprising the following steps: starting an induced draft fan to keep the interior of the double-stage double-shaft digester in a micro negative pressure state;
respectively continuously and quantitatively inputting cold-rolled alkaline mud, quick lime and fly ash into the two-stage double-shaft slaker through a double-shaft screw conveyor, a first single-shaft screw conveyor and a second single-shaft screw conveyor to be mixed to obtain a mixture; conveying the mixture to a proportioning bin by using a closed belt conveyor;
conveying the mixture in the proportioning bin to a rotary mixer by using a disk feeder, and mixing the mixture with a preset raw material to prepare a sintering raw material;
the mass ratio of the quick lime to the dedusting ash is 1: 0.3-1;
the ratio of the mass of the cold-rolled alkali mud to the total mass of the quick lime and the fly ash is 1
(0.3-0.8)；
The mixing time of the cold-rolled alkali mud, the quicklime and the fly ash is 3-6 minutes;
the water content of the mixture is 35-45%;
the mass fraction of the mixture in the sintering raw material is 0.1-3%.
2. The method for preparing a sintering raw material by using cold rolling alkaline mud according to claim 1, wherein the mass ratio of the quick lime to the dedusting ash is 1: 0.5.
3. A system for preparing a sintering material using cold rolling soda ash, the system being used in the method for preparing a sintering material using cold rolling soda ash according to any one of claims 1 to 2, the system comprising: first unipolar screw conveyer, second unipolar screw conveyer, biax screw conveyer, doublestage biax digestion machine, draught fan, airtight band conveyer, proportioning bins, disk feeder and rotary mixing machine, wherein, first unipolar screw conveyer the second unipolar screw conveyer with biax screw conveyer respectively with doublestage biax digestion machine is connected, doublestage biax digestion machine respectively with the draught fan with airtight band conveyer connects, airtight band conveyer with the proportioning bins is connected, the proportioning bins with the disk feeder is connected, the disk feeder with rotary mixing machine connects.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203715695U (en) * | 2014-02-12 | 2014-07-16 | 北京芬奥科贸有限公司 | Sintering proportioning room internally containing multiple proportioning bins |
| CN107723470A (en) * | 2017-10-10 | 2018-02-23 | 东北大学 | A kind of method of mixing slag production by cupric and iron |
| CN110016551A (en) * | 2019-05-06 | 2019-07-16 | 中冶华天工程技术有限公司 | Cold rolling sludge converter resource utilization method |
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| JP2002020819A (en) * | 2000-07-06 | 2002-01-23 | Nippon Steel Corp | Method for pretreating sintering raw material |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203715695U (en) * | 2014-02-12 | 2014-07-16 | 北京芬奥科贸有限公司 | Sintering proportioning room internally containing multiple proportioning bins |
| CN107723470A (en) * | 2017-10-10 | 2018-02-23 | 东北大学 | A kind of method of mixing slag production by cupric and iron |
| CN110016551A (en) * | 2019-05-06 | 2019-07-16 | 中冶华天工程技术有限公司 | Cold rolling sludge converter resource utilization method |
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