CN114797668A - Calcium oxide ball pressing system and process for firing carbide slag - Google Patents
Calcium oxide ball pressing system and process for firing carbide slag Download PDFInfo
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- CN114797668A CN114797668A CN202210289853.6A CN202210289853A CN114797668A CN 114797668 A CN114797668 A CN 114797668A CN 202210289853 A CN202210289853 A CN 202210289853A CN 114797668 A CN114797668 A CN 114797668A
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- calcium oxide
- aggregate
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- carbide slag
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
- B01J2/22—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by pressing in moulds or between rollers
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/90—Carbides
- C01B32/914—Carbides of single elements
- C01B32/942—Calcium carbide
Abstract
The invention discloses a calcium oxide ball pressing system and a calcium oxide ball pressing process for firing carbide slag, wherein the calcium oxide ball pressing process specifically comprises the following steps: the aggregate preparation unit prepares raw material powder into aggregate, the mixed ball pressing unit mixes the raw material powder and the aggregate to press the raw material powder and the aggregate into calcium oxide balls, the purification unit purifies dust-containing gas generated in the aggregate preparation unit and the mixed ball pressing unit and then discharges the gas into the atmosphere, and the negative pressure unit maintains negative pressure in the ball manufacturing process of the aggregate preparation unit and the mixed ball pressing unit. The invention improves the strength and thermal stability of the calcium oxide balls, does not add any caking additive in the process of balling, solves the technical problems of low strength and easy pulverization of the calcium oxide balls when the calcium oxide is circularly used as the calcium carbide raw material in the process of firing the calcium oxide slag, and creates conditions for the chemical enterprises to circularly and comprehensively utilize the calcium oxide slag.
Description
Technical Field
The invention relates to the technical field of powder material ball pressing, in particular to a calcium oxide ball pressing system fired by carbide slag and a process thereof.
Background
The carbide slag is calcium carbide (CaC) 2 ) The waste residue discharged after the acetylene gas is generated by hydrolysis mainly comprises Ca (OH) 2 Removing impurities from carbide slag by gravity separation methodAnd then, the content of the calcined finished product calcium oxide is more than 92 percent, and the calcium oxide can be recycled as a calcium carbide production raw material after being pressed into balls, so that a new way is developed for the comprehensive utilization of the calcium carbide slag. Meanwhile, Ca (OH) in the carbide slag 2 With CaCO as the main component of limestone 3 Compared with low decomposition heat, no CO is generated after decomposition 2 The method is a more economic and environment-friendly production way for calcium carbide production, and accords with the national industrial policy of developing circular economy, saving energy and reducing emission.
The high-quality CaO powder generated by calcining the carbide slag has the fineness of less than 80 mu m and the density of 3.35g/cm 3 Bulk density of about 0.7g/cm 3 The density differs from the bulk density by a factor of approximately 5. The calcium oxide balls pressed by the common pelletizing process are difficult to meet the requirements of cold and hot high-strength pellets, and the main reasons are that the fineness of calcium oxide fired by carbide slag is small, the particle size distribution range is narrow, proper particle size distribution is not available, the common pelletizing process cannot completely discharge air in powder, the compactness of the calcium oxide balls is influenced, the intermolecular binding force of the calcium oxide balls is weakened, the air has outward tension after being compressed in the calcium oxide balls, and particularly, after the calcium oxide balls enter a calcium carbide furnace, the air rapidly expands under the action of high temperature, so that the calcium oxide balls are cracked, and the normal production of the calcium carbide furnace is influenced.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a ball pressing system and a process specially for calcium oxide fired by carbide slag, so as to improve the strength and the thermal stability of calcium oxide balls and solve the technical problems of low strength and easy pulverization of the calcium oxide balls when the calcium oxide fired by the carbide slag is circularly used as a calcium carbide raw material.
In a first aspect, the invention provides a calcium oxide ball pressing process method for firing carbide slag, which specifically comprises the following steps:
the device comprises an aggregate preparation unit, a mixed ball pressing unit, a purification unit and a negative pressure unit, wherein the aggregate preparation unit is used for preparing raw material powder into aggregates, the mixed ball pressing unit is used for mixing and pressing the raw material powder and the aggregates into calcium oxide balls, the purification unit is used for purifying dust-containing gas generated in the aggregate preparation unit and the mixed ball pressing unit and then exhausting the dust-containing gas into the atmosphere, and the negative pressure unit is used for keeping negative pressure in the ball making process of the aggregate preparation unit and the mixed ball pressing unit.
Preferably, the aggregate preparation unit prepares the raw material powder into the aggregate by the specific steps of: and granulating, crushing and screening, wherein fine particles with qualified particle sizes are used as aggregates after screening, and large particles with unqualified particle sizes are recycled to the aggregate preparation unit for crushing and screening.
Preferably, the particle size of the aggregate is less than or equal to 3 mm.
Preferably, the method further comprises the step of screening the calcium oxide balls, and conveying the unqualified calcium oxide balls to a mixed ball pressing unit for re-pressing.
Preferably, the mixing ratio of the aggregate to the raw material powder in the material of the mixing and ball-pressing unit is 1: 1-1: 3.
Preferably, the ball pressing pressure of the mixed ball pressing unit is 5-12 MPa.
Preferably, when the purification unit purifies the dust-containing gas generated in the aggregate preparation unit and the mixed ball pressing unit, the dust collected by the purification unit is conveyed to the mixed ball pressing unit for ball pressing again.
In a second aspect, a calcium oxide ball pressing system for firing carbide slag is provided, which is applied to the process and is characterized by comprising an aggregate preparation unit, a mixed ball pressing unit, a purification unit and a negative pressure unit;
the aggregate preparation unit comprises a first forced feeding machine, a granulator, a crusher and a sieving machine;
the mixing and ball-pressing unit comprises a stirrer, a second forced feeder and a ball pressing machine; the screening machine is positioned upstream of the blender;
the purification unit comprises a dust collection air pipe, a dust collector and an exhaust fan;
the negative pressure unit comprises a negative pressure fan, a negative pressure pipeline and a filtering device; the negative pressure pipeline is respectively communicated with the first forced feeder and the second forced feeder.
Preferably, the purification unit is arranged near or centrally near the dust point of the system.
Preferably, the dust collector is a bag type dust collector.
By adopting the technical scheme, compared with the prior art, the invention has the following technical effects:
according to the invention, according to the characteristics that calcium oxide particles fired by carbide slag are fine, and the pressed calcium oxide balls need high-temperature-resistant strength when entering a carbide furnace, a process route that raw material powder is firstly pressed into aggregate, and then the aggregate and the raw material powder are mixed and pressed into the calcium oxide balls is adopted, so that the raw materials have good particle grading during ball pressing, and the void volume of the materials is reduced.
Meanwhile, a negative pressure ball making process is adopted when the aggregate and the calcium oxide balls are pressed, air in the powder is discharged, so that the air content in the calcium oxide balls is reduced, the compactness of the calcium oxide balls is increased, the strength and the thermal stability of the calcium oxide balls are improved, no adhesive additive is added in the ball making process, the technical problems of low strength and easy pulverization of the calcium oxide balls when the calcium oxide is fired by the carbide slag and circularly used as a calcium carbide raw material are solved, and conditions are created for chemical enterprises to circularly and comprehensively utilize the carbide slag.
Drawings
FIG. 1 is a flow chart of a calcium oxide ball pressing process for carbide slag firing;
the symbols in the drawings indicate the description:
01-a first raw material bin; 02-first powder weighing; 03-a first scraper conveyor; 04-a first bucket elevator; 05-a first forced feeder; 06-granulating machine; 07-a second scraper conveyor; 08-a second bucket elevator; 09-roll crusher; 10-a first screening machine; 11-a third scraper conveyor; 12-a fourth scraper conveyor; 13-dust collecting air pipe; 14-bag house dust collector; 15-an exhaust fan; 16-a negative pressure conduit; 17-a negative pressure fan; 18-a second feedstock bin; 19-second powder metering weighing; 20-a fifth flight conveyor; 21-a double-shaft mixer; 22-a third bucket elevator; 23-a second forced feeder; 24-ball press machine; 25-a first belt conveyor; 26-a second screening machine; 27-a second belt conveyor; 28-finished product bin; 29-sixth flight conveyor.
Detailed Description
The present invention will be described in detail and specifically with reference to the following examples to facilitate better understanding of the present invention, but the following examples do not limit the scope of the present invention.
Example 1
As shown in fig. 1, the present embodiment provides a calcium oxide ball pressing process method for firing carbide slag, which specifically includes the following steps:
the device comprises an aggregate preparation unit, a mixed ball pressing unit, a purification unit and a negative pressure unit, wherein the aggregate preparation unit is used for preparing raw material powder into aggregates, the mixed ball pressing unit is used for mixing and pressing the raw material powder and the aggregates into calcium oxide balls, the purification unit is used for purifying dust-containing gas generated in the aggregate preparation unit and the mixed ball pressing unit and then exhausting the dust-containing gas into the atmosphere, and the negative pressure unit is used for keeping negative pressure in the ball making process of the aggregate preparation unit and the mixed ball pressing unit.
In this embodiment, the concrete steps of the aggregate preparation unit preparing the raw material powder into the aggregate are as follows: and granulating, crushing and screening, wherein fine particles with qualified particle sizes are used as aggregates after screening, and large particles with unqualified particle sizes are recycled to the aggregate preparation unit for crushing and screening.
In a preferred embodiment, as shown in fig. 1, raw material powder is gradually extruded into flaky granular materials under the action of the extrusion force between two rollers of a granulator 06, the flaky granular materials are sent to a roller crusher 09 to be crushed, and the crushed materials enter a first sieving machine 10; furthermore, the aperture of the screen mesh is 3mm, and the granularity of the aggregate is less than or equal to 3 mm; large particles larger than 3mm are conveyed into the roller crusher 09 for recycling and re-crushing, and fine particles smaller than 3mm are conveyed as qualified aggregates by the fourth scraper conveyor 12 to the double-shaft mixer 21 in the mixing and pelletizing unit.
In the embodiment, the method also comprises the step of screening the calcium oxide balls, and conveying the unqualified calcium oxide balls to the mixed ball pressing unit for re-pressing.
In a preferred embodiment, as shown in fig. 1, the mixture of raw meal and aggregate is gradually pressed into an oval granular material by the pressing force between the two rolls of the ball press 24, the oval granular material is fed to the second sifter 26 for sifting, and the unqualified meal is fed to the mixing and ball pressing unit for ball pressing again.
Furthermore, the mixing ratio of the aggregate to the raw material powder in the mixing and ball-pressing unit is 1: 1-1: 3.
In the embodiment, the ball pressing pressure of the mixed ball pressing unit is 5-12 MPa.
In this embodiment, when the purification unit purifies the dust-containing gas generated in the aggregate preparation unit and the mixed ball pressing unit, the dust collected by the purification unit is conveyed to the mixed ball pressing unit for ball pressing again.
Example 2
The embodiment provides a calcium oxide ball pressing system for firing carbide slag, which is applied to the process provided in the embodiment 1 and comprises an aggregate preparation unit, a mixed ball pressing unit, a purification unit and a negative pressure unit.
Specifically, as shown in fig. 1, the aggregate preparation unit includes a first raw material bin 01, a first powder scale 02, a first scraper conveyor 03, a first bucket elevator 04, a first forced feeder 05, a granulator 06, a second scraper conveyor 07, a second bucket elevator 08, a roller crusher 09, a first screening machine 10, a third scraper conveyor 11, and a fourth scraper conveyor 12.
The raw material powder in the first raw material bin 01 is metered by a first powder metering scale 02 and then is conveyed to a first forced feeder 05 through a first scraper conveyor 03 and a first bucket elevator 04, the first forced feeder 05 continuously and uniformly feeds the raw material powder into the granulator 06 at a certain pressure, under the action of the extrusion force between two rollers of the granulator 06, the raw material powder is gradually extruded into flaky granular materials, the flaky granular materials are sent to a roller type crusher 09 through a second scraper conveyor 07 and a second bucket elevator 08 to be crushed, the crushed materials enter a first sieving machine 10 with the sieve mesh aperture of 3mm, large particles larger than 3mm are conveyed into the roller type crusher 09 by the third scraper conveyor 11 and the second bucket elevator 08 for circular re-crushing, and fine particles smaller than 3mm are conveyed to the mixed ball-pressing unit by the fourth scraper conveyor 12 as qualified aggregates.
Specifically, as shown in fig. 1, the mixing and ball-pressing unit includes a second raw material bin 18, a second powder scale 19, a fifth scraper conveyor 20, a double-shaft mixer 21, a third bucket elevator 22, a second forced feeder 23, a ball-pressing machine 24, a first tape conveyor 25, a second sieving machine 26, a second tape conveyor 27, a finished product bin 28, and a sixth scraper conveyor 29.
The raw material powder in the second raw material bin 18 is metered by a second powder metering scale 19 and then is sent into a double-shaft stirrer 21 through a fifth scraper conveyor 20, the qualified aggregate prepared by an aggregate preparation unit is also sent into the double-shaft stirrer 21 through a fourth scraper conveyor 12, the two materials in the double-shaft stirrer 21 are mixed and stirred, the stirred and mixed material is sent into a second forced feeder 23 through a third bucket elevator 22, the raw material powder is continuously and uniformly conveyed into a ball press machine 24 through the second forced feeder 23 at a certain pressure, the raw material powder is gradually extruded into an elliptical particle material under the action of the extrusion force between two rollers of the ball press machine 24, the elliptical particle material is conveyed into a second screening machine 26 through a first belt conveyor 25 and screened, the unqualified powder is conveyed into a mixing ball press unit through a sixth scraper conveyor 29 and a third bucket elevator 22 and is pressed again, qualified finished product materials are conveyed to a finished product bin 28 by a second belt conveyor 27 to be stored.
Specifically, as shown in fig. 1, the cleaning unit includes a dust collection air duct 13, a bag type dust collector 14, and an exhaust fan 15.
In the aggregate preparation unit aggregate preparation process, dust-containing gas generated in the material conveying, crushing and screening processes enters a bag type dust collector 14 through a dust collection air pipe 13 for purification treatment, purified waste gas is discharged into the atmosphere through an exhaust fan 15, and dust collected by the bag type dust collector 14 and qualified aggregate are conveyed to a mixed ball pressing unit through a fourth scraper conveyor 12.
In the process of pressing the balls in the mixed ball pressing unit, dust-containing gas generated in the processes of material conveying, ball pressing and screening enters the bag type dust collector 14 through the dust collecting air pipe 13 for purification treatment, purified waste gas is exhausted into the atmosphere through the exhaust fan 15, and dust collected by the bag type dust collector 14 and screened fine powder are conveyed to the mixed ball pressing unit through the sixth scraper conveyor 29 and the third bucket elevator 22 to be pressed into the balls again.
Specifically, as in fig. 1, the negative pressure unit includes a negative pressure duct 16, a negative pressure blower 17, and a filter device.
The first forced feeder 05 is provided with a filter device, the negative pressure pipeline 16 and the negative pressure fan 17 pump out air in the first forced feeder 05, and the first forced feeder 05 continuously and uniformly conveys the raw material powder into the granulator 06 at a certain pressure.
The second forced feeder 23 is provided with a filtering device, the negative pressure pipeline 16 and the negative pressure fan 17 pump out air in the second forced feeder 23, and the second forced feeder 23 continuously and uniformly conveys the raw material powder into the ball press machine 24 at a certain pressure.
The embodiments of the present invention have been described in detail, but the embodiments are merely examples, and the present invention is not limited to the embodiments described above. Any equivalent modifications and substitutions to those skilled in the art are also within the scope of the present invention. Accordingly, equivalent changes and modifications made without departing from the spirit and scope of the present invention should be covered by the present invention.
Claims (10)
1. A calcium oxide ball pressing process for firing carbide slag is characterized by comprising the following steps: the device comprises an aggregate preparation unit, a mixed ball pressing unit, a purification unit and a negative pressure unit, wherein the aggregate preparation unit is used for preparing raw material powder into aggregates, the mixed ball pressing unit is used for mixing and pressing the raw material powder and the aggregates into calcium oxide balls, the purification unit is used for purifying dust-containing gas generated in the aggregate preparation unit and the mixed ball pressing unit and then exhausting the dust-containing gas into the atmosphere, and the negative pressure unit is used for keeping negative pressure in the ball making process of the aggregate preparation unit and the mixed ball pressing unit.
2. The calcium oxide pellet pressing process fired by carbide slag as claimed in claim 1, wherein the concrete steps of the aggregate preparation unit for preparing the raw material powder into the aggregate are as follows: and granulating, crushing and screening, wherein fine particles with qualified particle sizes are used as aggregates after screening, and large particles with unqualified particle sizes are recycled to the aggregate preparation unit for crushing and screening.
3. The calcium oxide pellet pressing process fired by carbide slag as claimed in claim 2, wherein the particle size of the aggregate is less than or equal to 3 mm.
4. The calcium oxide pellet pressing process for carbide slag firing as claimed in claim 1, further comprising screening the calcium oxide pellets, and transferring the unqualified calcium oxide pellets to the mixed pellet pressing unit for re-pellet pressing.
5. The calcium oxide pellet pressing process for carbide slag firing according to claim 1, wherein the mixing ratio of the aggregate to the raw material powder in the material of the mixed pellet pressing unit is 1:1 to 1: 3.
6. The calcium oxide pellet pressing process for carbide slag firing according to claim 1, wherein the pellet pressing pressure of the mixed pellet pressing unit is 5 to 12 MPa.
7. The calcium oxide pellet press process fired by carbide slag as claimed in claim 1, wherein when the purification unit purifies the dust-containing gas generated in the aggregate preparation unit and the mixed pellet press unit, the dust collected by the purification unit is transferred to the mixed pellet press unit for re-pelletizing.
8. The calcium oxide ball pressing system for firing the carbide slag is applied to the process as claimed in any one of claims 1 to 7, and is characterized by comprising an aggregate preparation unit, a mixed ball pressing unit, a purification unit and a negative pressure unit; the aggregate preparation unit comprises a first forced feeding machine, a granulator, a crusher and a sieving machine;
the mixing and ball-pressing unit comprises a stirrer, a second forced feeder and a ball pressing machine; the screening machine is positioned upstream of the blender;
the purification unit comprises a dust collection air pipe, a dust collector and an exhaust fan;
the negative pressure unit comprises a negative pressure fan, a negative pressure pipeline and a filtering device; the negative pressure pipeline is respectively communicated with the first forced feeder and the second forced feeder.
9. The calcium oxide pellet system for carbide slag firing according to claim 8, wherein said purification unit is located near or concentrated near the system dusting point.
10. The carbide slag-fired calcium oxide pellet press system of claim 8, wherein the dust collector is a bag collector.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210289853.6A CN114797668A (en) | 2022-03-23 | 2022-03-23 | Calcium oxide ball pressing system and process for firing carbide slag |
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| CN202210289853.6A CN114797668A (en) | 2022-03-23 | 2022-03-23 | Calcium oxide ball pressing system and process for firing carbide slag |
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