CN101348861A - Curing method of rust bonded pellet - Google Patents
Curing method of rust bonded pellet Download PDFInfo
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- CN101348861A CN101348861A CNA2008103045085A CN200810304508A CN101348861A CN 101348861 A CN101348861 A CN 101348861A CN A2008103045085 A CNA2008103045085 A CN A2008103045085A CN 200810304508 A CN200810304508 A CN 200810304508A CN 101348861 A CN101348861 A CN 101348861A
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Abstract
The invention belongs to the metallurgical field, in particular relating to a method for curing a rusted consolidated pellet. The technical problem to be solved is to provide a brand new method for curing the rusted consolidated pellet with short consolidated curing time and high pellet strength. The method particularly comprises the following steps: the pellet is placed into a container the inner wall of which is laid by heat-insulating materials and which is sealed by the heat-insulating materials, and the heat-insulating materials for sealing are uncovered interruptedly to remove vapor when the central temperature of the pellet reaches between 40 and 60 DEG C; after the pellet is dried, the heat-insulating materials for sealing are removed, the container is cooled to the room temperature and sprayed with water or dilute sulfuric acid the concentration of which is less than 5 percent until the pellet is completely moistened, the container is sealed by the heat-insulating materials again, and then the heat-insulating materials are uncovered interruptedly to remove the vapor when the central temperature of the pellet is raised to between 60 and 80 DEG C; and if the strength of the pellet does not reach the requirement, the steps can be repeated until the requirement is met. By application of the method, the pellet hardening reaction speed is accelerated; the curing period of the pellet is shortened; the curing site is reduced; the mechanical strength and the production efficiency of the pellet are improved; and the method is suitable for high-efficiency mass production.
Description
Technical field
The invention belongs to field of metallurgy, be specifically related to the maintenance process of rust bonded pellet.
Background technology
Rust bonded pellet is about to cast iron filing (8～15%) and salt (0.5～1%) adds in the iron ore concentrate; make agglomerate; again nodulizing is placed on ventilation condition better and carry out nature on the place that there was dampness in the air and spread maintenance; make cast iron filing oxidation corrosion produce iron rust and form skeleton, and adhered to one another and carry out fixed with each ore particle.Its shortcoming is that green ball strength is lower, and consolidation time is longer, needs bigger place.Therefore Shang Weijian is applied to big relevant report of producing with rust bonded pellet.
Summary of the invention
Technical problem solved by the invention provides a kind of maintenance process of brand-new rust bonded pellet, and consolidation time is short, maintenance gained pelletizing physical strength height.
The pelletizing that will utilize the compacting of rustization consolidation mechanism and get adopts following method maintenance:
A, the container rear surface that places inwall to lay lagging material pelletizing seal with lagging material;
B, when treating that container endosphere heap core temperature reaches 40～60 ℃, open face seal and get rid of steam in the container with lagging material, with the lagging material sealing, this step is until drying repeatedly again;
C, treat the pelletizing drying after, remove the sealing lagging material, be cooled to room temperature, outer water spray or concentration are all moistening to pelletizing less than 5% dilute sulphuric acid, again with lagging material sealing, treat that ball heap core temperature rises to 60～80 ℃ after, open face seal and get rid of steam in the container with lagging material, with the lagging material sealing, this step is until drying repeatedly again;
D, if the pelletizing physical strength do not reach requirement, but repeating step C is until reaching requirement.
Beneficial effect of the present invention is: the heat energy that this maintenance process rationally utilizes, excites and protect the pelletizing self of rustization mechanism to produce; quicken pelletizing consolidation reaction speed; shorten pelletizing curing cycle; reduce the maintenance place; improve pelletizing physical strength and production efficiency, be suitable for efficient and large-scale production.
Description of drawings
Fig. 1 pellet formation process flow sheet.
The employed material frame of Fig. 2 maintenance process of the present invention;
Fig. 3 is shop plastics rubber in the material frame;
Fig. 4 is with the pelletizing material frame of packing into;
Fig. 5 pelletizing is paved with rear surface lid layer plastics film and carries out maintenance;
Fig. 6 pelletizing finished product;
Wherein, Fig. 2-Fig. 6 is a maintenance process scene photograph of the present invention.
Embodiment
The embodiment of form is described in further detail maintenance process of the present invention again by the following examples.But this should be interpreted as that the protection domain of maintenance process of the present invention only limits to following example.
Maintenance process of the present invention mainly is the heat energy that utilizes the pelletizing of rustization mechanism preparation self to produce when stacking; make and contain metal matrix (as cast iron filing, metal iron powder, metal magnesium powder etc.) the oxidation corrosion formation skeleton that gets rusty; and adhered to one another and carry out fixedly with each ore particle, make its intensity reach big blast-furnace smelting requirement.
Maintenance process of the present invention comprises the steps:
A, will utilize rustization consolidation mechanism compacting and the pelletizing container rear surface that places inwall to lay lagging material seal with lagging material.
Wherein, container adopts material frame or feed bin that certain weight capacity need be arranged, and the big I of container determines that according to industrial scale inwall is also fixing with the lagging material place mat.
Be provided with water-freeing arrangement (as water vent etc.) at container bottom, the container solid be distributed with temperature measuring equipment (as, thermometers etc. are used to measure each temperature of ball heap upper, middle and lower), ventilation plant (as ventilator trunk) and sprinkler system (as the pipeline of sprinkling water).Can force to pile inside respectively to air-supply by ventilation plant, be used to provide rustization reaction medium oxygen to ball.
B, when treating that container endosphere heap core temperature reaches 40～60 ℃, open face seal and get rid of steam in the container with lagging material, with the lagging material sealing, this step is until drying repeatedly again.
Treat preferably during implementation step B that ball heap core temperature rises to 50 ℃, the vessel surface vapour concentration reaches capacity substantially in the time of rule of thumb in arriving this temperature range, otherwise surperficial pelletizing will be because of moisture excessive and softening or cracking.If only rely on the pelletizing self heat, heat-up rate is slower, can promote the pelletizing bulk temperature rapidly by the outer hot blast that supplies about 50 ℃ of ventilator trunk, accelerates the rustization reaction, shortens curing cycle.
C, treat the pelletizing drying after, remove the sealing lagging material, be cooled to room temperature, outer water spray or concentration are all moistening to pelletizing less than 5% dilute sulphuric acid, again with lagging material sealing, treat that ball heap core temperature rises to 60～80 ℃ after, open face seal and get rid of steam in the container with lagging material, with the lagging material sealing, this step is until drying repeatedly again.
Treat preferably during implementation step C that ball heap core temperature rises to 65 ℃, temperature is high more, pelletizing internal-response Shaoxing opera is strong, consolidation time is short more, pelletizing through a maintenance has possessed certain intensity, but still can be subjected to the influence of moisture and ftracture, therefore get rid of steam according to temperature range of pelletizing ability to bear optimization.
When implementing this step, if only rely on the pelletizing self heat, heat-up rate is slower, both can be by the outer hot wind supply of ventilator trunk, also can substitute normal-temperature water for 80～100 ℃ of high-temperature water or water vapor by the watering pipeline is outer, its purpose also is in order to promote the pelletizing bulk temperature rapidly, to improve speed of response, shortening curing cycle.
D, if the pelletizing physical strength does not reach requirement, but repeating step C after this moment, ball heap core temperature can be controlled to 80～95 ℃, is interrupted and opens lagging material and get rid of steam in the container until reaching requirement.
Container can be considered the feed bin of skeleton construction or the material frame of metal construction, is laid on the chronicity that the interior lagging material of container will be considered operation, needs certain resistance to abrasion and toughness, and the surface is smooth, so adopt rubber or warming plate place mat and fixing; The lagging material that is used for face seal will be considered removable, so adopt plastics film or rubber cheap and easy to get.
Pellet feed: slag iron ore concentrate 30%, ground hematite 60%, brown ocher 10%; Join salt 2.0% outward.Preparation technology according to Fig. 1 suppress green-ball.Material composition, granularity see Table 1.
Table 1 raw materials for production situation, %
Embodiment 2 pelletizing maintenance processes
The green-ball that embodiment 1 preparation is got is according to natural curing method (cooled agglomerated pellet that presses is in cement court natural curing) and maintenance process of the present invention, every the regular hour pelletizing is carried out intensity detection, the pellet strength changing conditions of different maintenance processes relatively sees Table 2.
The maintenance process detailed step of the present invention that present embodiment adopted is as follows:
A, the material frame rear surface that places inwall to lay rubber pelletizing seal with plastics film;
B, when treating that ball heap core temperature reaches 50 ℃, open face seal and get rid of steam in the container with lagging material, with the lagging material sealing, this step is until drying repeatedly again;
C, treat the pelletizing drying after, remove plastics film, be cooled to room temperature, outer water spray or water vapor are all moistening to pelletizing, again with lagging material sealing, treat that ball heap core temperature rises to 65 ℃ after, open face seal and get rid of steam in the container with lagging material, with the lagging material sealing, this step is until drying repeatedly again;
D, if the pelletizing mechanical hardness do not reach requirement, but repeating step C is until reaching requirement.
Wherein 1 sprays normal-temperature water outward.2 is outer spray normal-temperature water, logical simultaneously hot blast.3 is outer water spray steam.Fig. 2-Fig. 6 is a maintenance process scene photograph of the present invention.
The different maintenance process cooled agglomerated pellet of table 2 barrate strength changing conditions, %
Remarks: the finished ball granularity is the briquetting of 35mm * 30mm * 25mm (length * wide * height)
As shown in Table 2, produce cooled agglomerated pellet and adopt maintenance process of the present invention can increase substantially the pelletizing consolidation rate, can shorten 10～15 days curing cycles than former maintenance process, the finished ball physical strength also can be improved, and effect is remarkable; Maintenance process of the present invention can also can obtain better effect as utilizing outer heat supply.
Claims (10)
1. the maintenance process of rust bonded pellet is characterized in that it comprises the steps:
A, will utilize rustization consolidation mechanism compacting and the pelletizing container rear surface that places inwall to lay lagging material seal with lagging material;
B, when treating that container endosphere heap core temperature reaches 40～60 ℃, open face seal and get rid of steam in the container with lagging material, with the lagging material sealing, this step is until drying repeatedly again;
C, treat the pelletizing drying after, remove the sealing lagging material, be cooled to room temperature, outer water spray or concentration are all moistening to pelletizing less than 5% dilute sulphuric acid, again with lagging material sealing, treat that ball heap core temperature rises to 60～80 ℃ after, open face seal and get rid of steam in the container with lagging material, with the lagging material sealing, this step is until drying repeatedly again;
D, if the pelletizing physical strength do not reach requirement, but repeating step C is until reaching requirement.
2. the maintenance process of rust bonded pellet according to claim 1 is characterized in that described container is material frame or feed bin.
3. the maintenance process of rust bonded pellet according to claim 1 is characterized in that the lagging material that is laid in the container is rubber or warming plate.
4. the maintenance process of rust bonded pellet according to claim 1, the lagging material that it is characterized in that being used for face seal is plastics film or rubber.
5. the maintenance process of rust bonded pellet according to claim 1 when it is characterized in that the described ball heap of step B core temperature reaches 50 ℃ of left and right sides, is interrupted and opens the face seal lagging material.
6. the maintenance process of rust bonded pellet according to claim 1 is characterized in that the outer water spray of step C is water vapor or high-temperature water.
7. the maintenance process of rust bonded pellet according to claim 1 after it is characterized in that step C is described and treating that ball heap core temperature rises to about 65 ℃, is interrupted and opens surperficial lagging material.
8. the maintenance process of rust bonded pellet according to claim 1 is characterized in that logical hot blast in maintenance processes.
9. the maintenance process of rust bonded pellet according to claim 1 is characterized in that described container bottom is provided with water-freeing arrangement, and the container solid is distributed with temperature measuring equipment, ventilation plant and sprinkler system.
10. the maintenance process of rust bonded pellet according to claim 9 is characterized in that described water-freeing arrangement is a water vent; Described ventilation plant is a ventilator trunk; Described sprinkler system is the watering pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008103045085A CN101348861B (en) | 2008-09-16 | 2008-09-16 | Curing method of rust bonded pellet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008103045085A CN101348861B (en) | 2008-09-16 | 2008-09-16 | Curing method of rust bonded pellet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101348861A true CN101348861A (en) | 2009-01-21 |
| CN101348861B CN101348861B (en) | 2010-06-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008103045085A Expired - Fee Related CN101348861B (en) | 2008-09-16 | 2008-09-16 | Curing method of rust bonded pellet |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102643980A (en) * | 2012-05-09 | 2012-08-22 | 常州市茂盛特合金制品有限公司 | Automatic production system for manganese metal ball |
| CN104451137A (en) * | 2014-12-11 | 2015-03-25 | 西昌市和城工贸有限公司 | Production method of cold-solidified rusted pellet |
| CN106834664A (en) * | 2017-01-10 | 2017-06-13 | 太原钢铁(集团)有限公司 | A kind of method for improving hematite flotation powder ballability |
-
2008
- 2008-09-16 CN CN2008103045085A patent/CN101348861B/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102643980A (en) * | 2012-05-09 | 2012-08-22 | 常州市茂盛特合金制品有限公司 | Automatic production system for manganese metal ball |
| CN102643980B (en) * | 2012-05-09 | 2013-10-09 | 常州市茂盛特合金制品有限公司 | Automatic production system for manganese metal ball |
| CN104451137A (en) * | 2014-12-11 | 2015-03-25 | 西昌市和城工贸有限公司 | Production method of cold-solidified rusted pellet |
| CN104451137B (en) * | 2014-12-11 | 2017-01-11 | 西昌市和城工贸有限公司 | Production method of cold-solidified rusted pellet |
| CN106834664A (en) * | 2017-01-10 | 2017-06-13 | 太原钢铁(集团)有限公司 | A kind of method for improving hematite flotation powder ballability |
| CN106834664B (en) * | 2017-01-10 | 2018-07-17 | 太原钢铁(集团)有限公司 | A method of improving hematite flotation powder ballability |
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| Publication number | Publication date |
|---|---|
| CN101348861B (en) | 2010-06-16 |
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