CN112679152A - Environment-friendly incineration ash recycling method - Google Patents
Environment-friendly incineration ash recycling method Download PDFInfo
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- CN112679152A CN112679152A CN202110068534.8A CN202110068534A CN112679152A CN 112679152 A CN112679152 A CN 112679152A CN 202110068534 A CN202110068534 A CN 202110068534A CN 112679152 A CN112679152 A CN 112679152A
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Abstract
The invention relates to an environment-friendly method for recycling incineration ash, which belongs to the technical field of incineration ash treatment equipment and comprises the steps of pretreating untreated ash, screening particles of the ash, and removing stones, bricks, ceramic fragments, glass fragments and other metal particles. And then, treating by using a strong magnetic device to remove ferrous metals, and washing the ash slag after magnetic separation to remove chloride ions so as to leach out chloride ions and heavy metals through washing treatment. Filtering the ash residue water after the water washing treatment, dehydrating by using filter press equipment to form ash residue cakes, crushing the ash residue cakes, and heating, baking and dehydrating. And mixing the pretreated ash slag with the environment-friendly baking-free brick to prepare a mixture, putting the stirred mixture into a brick mould, pressing and molding the mixture by using a hydraulic machine, and demoulding and naturally curing the mixture to obtain the finished baking-free brick. The method has the characteristics of high utilization rate, energy conservation, environmental protection and good application stability. The problem of how to carry out cyclic utilization with burning lime-ash is solved.
Description
Technical Field
The invention relates to the technical field of incineration ash treatment equipment, in particular to an environment-friendly incineration ash recycling method.
Background
Incineration ash refers to solid ash generated by an incineration system. The incineration ash refers to bottom ash and fly ash generated after incineration of domestic garbage and general industrial solid wastes, and slag, furnace ash, waste sand and waste steel slag (foundry, steel plant and the like) generated after high-temperature processing in the production and manufacturing process of enterprises.
The ash contains some toxic and harmful pollutants, such as ferrous and nonferrous metals, chloride ions, products after the reaction of added chemical agents, and the like. In particular from the incineration of household garbage, harmful chemical compounds such as pb (lead), cd (plastic) and Sb (antimony) in the household garbage are transferred into fly ash. The direct utilization of the untreated ash can have adverse effects on human health and the environment. The quantity of trillion tons per year in China is increased, and how to treat the ash slag is a big problem in the current non-waste city construction. The need of harmless and recycling treatment is very important and urgent.
Disclosure of Invention
The invention mainly solves the defects of low utilization rate, serious pollution and poor application stability in the prior art, and provides an environment-friendly incineration ash recycling method which has the characteristics of high utilization rate, energy conservation, environmental protection and good application stability. The problem of how to carry out cyclic utilization with burning lime-ash is solved.
The technical problem of the invention is mainly solved by the following technical scheme:
an environment-friendly incineration ash recycling method comprises the following operation steps:
the first step is as follows: the untreated ash is pretreated, and the ash is firstly subjected to particle screening to remove stones, bricks, ceramic fragments, glass fragments and other metal particles.
The second step is that: magnetically sorting the ash slag without impurities, and treating by using strong magnetic equipment to remove ferrous metals;
the third step: after magnetic separation, washing the ash with water to remove chloride ions, washing the ash with water at normal temperature twice at a ratio of 1:8, stirring the ash with water at the same time, wherein the stirring time is 10-20 min, and the precipitation time is 15-25 min, so that chloride ions and heavy metals are leached out through washing treatment.
The fourth step: filtering the ash residue water after the water washing treatment, dehydrating by using filter press equipment to form ash residue cakes, crushing the ash residue cakes, and heating, baking and dehydrating.
The fifth step: mixing the pretreated ash slag with 35-50 wt%, furnace ash 10-15 wt%, exempted fly ash 10-15 wt%, construction waste soil 15-25 wt%, cement 4-8 wt% and curing agent 0.2 wt%; and the ash slag mixed material enters a stirring system from a storage bin.
And a sixth step: and putting the stirred mixture into a brick mold, pressing and molding by using a hydraulic machine, demolding, and naturally curing for 8-28 days to obtain the finished baking-free brick.
Preferably, the curing agent comprises the following components in percentage by mass: 10-30% of cement, 10-30% of fly ash, 10-15% of activator, 2-20% of oxidant, 30-40% of cementing material and 15-25% of volcanic ash.
Preferably, in the pretreatment process, the ash is subjected to particle screening in a particle screening machine through a centrifugal exhaust fan, stones, bricks, ceramic chips, glass chips and other metal particles are removed, and then the ash is conveyed to a magnetic separator through a conveying pipe to be subjected to a ferrous metal removal process.
As preferred, when carrying out the granule screening, the hopper door is opened, and the cylinder drives the bottom door board closure, burns the lime-ash and sends into in the granule screening jar from the feeder hopper through the forklift, and the bottom door board keeps closed this moment, and the hopper door is also closed, is followed the conveyer pipe by centrifugal exhaust fan through the sucking disc in the granule screening jar and is selected the separation with the lime-ash, stays in the granule screening jar with stone, fragment of brick, ceramic fragment, glass piece and other metal particles simultaneously.
Preferably, after the particle screening is completed, the centrifugal exhaust fan stops running, then the air cylinder drives the bottom door plate to be opened, and stones, bricks, ceramic fragments, glass fragments and other metal particles fall into the waste material pool.
Preferably, the ash is conveyed by the conveying pipe to a belt in the frame, the belt is driven by the driving shaft to run around a magnetic roller fixed on the driven roller, the ash firstly falls into the ash collecting box, and then the ferrous metal is separated from the belt and falls into the ferrous metal collecting box under the action of gravity.
Preferably, the ash is blocked between the upper end position between the ash collecting box and the ferrous metal collecting box and the belt through a partition plate, the ash is prevented from entering the ferrous metal collecting box, and the partition plate is positioned at the front end of the central axis of the magnetic drum.
Preferably, the pressure for the hydromechanical pressing is from 25 tons to 35 tons.
The invention can achieve the following effects:
compared with the prior art, the invention provides an environment-friendly incineration ash recycling method which has the characteristics of high utilization rate, energy conservation, environmental protection and good application stability. The problem of how to carry out cyclic utilization with burning lime-ash is solved.
Drawings
FIG. 1 is a schematic view of the connection structure of the particle screening machine and the magnetic separator of the present invention.
Fig. 2 is a schematic structural view of a particle screening machine of the present invention.
Fig. 3 is a schematic view of the structure of the magnetic separator of the present invention.
In the figure: granule sieve separator 1, conveyer pipe 2, centrifugal air exhauster 3, magnetic separator 4, cylinder 5, feeder hopper 6, hopper door 7, sucking disc 8, granule screening jar 9, bottom door board 10, waste material pond 11, frame 12, driving shaft 13, belt 14, magnetic drum 15, driven roller 16, baffle 17, lime-ash collecting box 18, ferrous metal collecting box 19.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
Example (b): as shown in fig. 1, 2 and 3, the method for recycling environment-friendly incineration ash comprises the following operation steps:
the first step is as follows: the method comprises the following steps of pretreating untreated ash, screening particles of the ash, screening the particles of the ash in a particle screening machine 1 through a centrifugal exhaust fan 3, and removing stones, bricks, ceramic chips, glass chips and other metal particles.
When carrying out the granule screening, hopper door 7 is opened, and cylinder 5 drives bottom door board 10 closed, burns the lime-ash and sends into granule screening jar 9 from feeder hopper 6 through the forklift in, bottom door board 10 keeps closed this moment, and hopper door 7 is also closed, screens the separation with the lime-ash from conveyer pipe 2 through sucking disc 8 in granule screening jar 9 by centrifugal air exhauster 3, stays in granule screening jar 9 with stone, fragment of brick, ceramic fragment, glass fragment and other metal particles simultaneously. After the particle screening is finished, the centrifugal exhaust fan 3 stops running, then the air cylinder 5 drives the bottom door plate 10 to be opened, and stones, bricks, ceramic fragments, glass fragments and other metal particles fall into the waste material pool 11.
The second step is that: the ash slag without impurities is magnetically sorted, and the ash slag is conveyed into a magnetic sorting machine (4) by a conveying pipe 2 to be removed with ferrous metals.
The conveyor 2 feeds the ash onto a belt 14 inside the frame 12, the belt 14 being driven by a drive shaft 13 around a magnetic roller 15 fixed to a driven roller 16, the ash falling first into an ash collection box 18, and the ferrous metal coming off the belt 14 under the action of gravity and falling into a ferrous metal collection box 19.
The ash is blocked between the upper end position between the ash collecting box 18 and the black metal collecting box 19 and the belt 14 through a partition plate 17, so that the ash is prevented from entering the black metal collecting box 19, and the partition plate 17 is positioned at the front end of the central axis of the magnetic drum 15.
The third step: after magnetic separation, washing the ash with water to remove chloride ions, and washing with water at normal temperature twice, wherein the washing ratio is 1:8, stirring is carried out while washing with water, the stirring time is 15min, and the precipitation time is 20min, so that chloride ions and heavy metals are leached out through washing treatment.
The fourth step: filtering the ash residue water after the water washing treatment, dehydrating by using filter press equipment to form ash residue cakes, crushing the ash residue cakes, and heating, baking and dehydrating.
The fifth step: mixing the pretreated ash slag with 45 wt%, furnace ash 15 wt%, exempted fly ash 13.8 wt%, construction waste soil 20 wt%, cement 6 wt% and curing agent 0.2 wt% of an environment-friendly baking-free brick; and the ash slag mixed material enters a stirring system from a storage bin.
The curing agent comprises the following components in percentage by mass: 15% of cement, 20% of fly ash, 10% of activator, 10% of oxidant, 30% of cementing material and 15% of volcanic ash.
And a sixth step: and putting the stirred mixture into a brick die, and pressing and forming by using a hydraulic machine, wherein the pressing pressure of the hydraulic machine is 30 tons. And (4) demolding, and naturally curing for 18 days to obtain the finished baking-free brick.
Physical test conditions of the baking-free brick:
freezing resistance: -24 degrees, 36 hours, composite standard tested after 24 hours;
and (3) maintenance period: after 20 days;
and (3) pressure testing: compressive strength: more than or equal to 25MPa (average value);
density: 1788.3/M3;
water absorption: less than or equal to 10 percent, used for the bearing part; 8.9 percent to 18 percent for the non-bearing part;
freezing resistance: the mass loss is less than or equal to 2.0 percent, and the actual numerical value is 2.0 percent;
compressive strength after freeze-thaw: not less than 20 MPa, and the actual value is 22 MPa;
radioactivity: the internal irradiation index (IRa) is less than or equal to 1.0, and the actual numerical value is 0.19;
external irradiation index: (IY) is less than or equal to 1.0, and the actual value is 0.35.
Chemical test conditions of the baking-free brick:
unit judgment of detection result of detection item
Nickel n.d. (< 0.08) mg/L pass
Cadmium n.d. (< 0.08) mg/L pass
Lead N.D. (< 0.30) mg/L is qualified
Zinc n.d. (< 0.05) mg/L pass
Copper n.d. (< 0.08) mg/L pass
0.06 mg/L of total chromium is qualified
Arsenic n.d. (< 0.07) mg/L pass
Total mercury n.d. (< 0.05) mg/L pass
Hexavalent chromium 0.013 mg/L is qualified
Selenium n.d. (< 0.0003) mg/L qualify
Beryllium n.d. (< 0.03) mg/L pass
Barium 0.141 mg/L qualified
The water content is 3.17%
Dioxin 0.13 ug TEQ/kg qualified
In conclusion, the method for recycling the environment-friendly incineration ash has the characteristics of high utilization rate, energy conservation, environmental protection and good application stability. The problem of how to carry out cyclic utilization with burning lime-ash is solved.
The above description is only an embodiment of the present invention, but the structural features of the present invention are not limited thereto, and any changes or modifications within the scope of the present invention by those skilled in the art are covered by the present invention.
Claims (8)
1. An environment-friendly incineration ash recycling method is characterized by comprising the following operation steps:
the first step is as follows: pretreating untreated ash, firstly screening particles of the ash, and removing stones, bricks, ceramic fragments, glass fragments and other metal particles;
the second step is that: magnetically sorting the ash slag without impurities, and treating by using strong magnetic equipment to remove ferrous metals;
the third step: after magnetic separation, washing ash residues with water to remove chloride ions, washing the ash residues with water at normal temperature twice at a ratio of 1:8, stirring the ash residues with water at the same time, wherein the stirring time is 10-20 min, and the precipitation time is 15-25 min, so that chloride ions and heavy metals are leached out through washing treatment;
the fourth step: filtering the ash residue water after the water washing treatment, dehydrating by using filter press equipment to form an ash residue cake, crushing the ash residue cake, and heating, baking and dehydrating;
the fifth step: mixing the pretreated ash slag with 35-50 wt%, furnace ash 10-15 wt%, exempted fly ash 10-15 wt%, construction waste soil 15-25 wt%, cement 4-8 wt% and curing agent 0.2 wt%; the ash slag mixed material enters a stirring system from a storage bin;
and a sixth step: and putting the stirred mixture into a brick mold, pressing and molding by using a hydraulic machine, demolding, and naturally curing for 8-28 days to obtain the finished baking-free brick.
2. The recycling method of environment-friendly incineration ash according to claim 1, characterized in that: the curing agent comprises the following components in percentage by mass: 10-30% of cement, 10-30% of fly ash, 10-15% of activator, 2-20% of oxidant, 30-40% of cementing material and 15-25% of volcanic ash.
3. The recycling method of environment-friendly incineration ash according to claim 1, characterized in that: in the pretreatment process, ash slag is subjected to particle screening in a particle screening machine (1) through a centrifugal exhaust fan (3), stones, bricks, ceramic fragments, glass fragments and other metal particles are removed, and then the ash slag is conveyed into a magnetic sorting machine (4) through a conveying pipe (2) to be subjected to the ferrous metal removal process.
4. The recycling method of environment-friendly incineration ash according to claim 3, characterized in that: when carrying out the granule screening, hopper door (7) are opened, cylinder (5) drive bottom door board (10) are closed, burn in the lime-ash and send into granule screening jar (9) from feeder hopper (6) through the forklift, bottom door board (10) keep closed this moment, hopper door (7) are also closed, screen the separation with the lime-ash from conveyer pipe (2) through sucking disc (8) in granule screening jar (9) by centrifugal air exhauster (3), simultaneously with stone, the fragment of brick, ceramic fragment, glass fragment and other metal particles stay in granule screening jar (9).
5. The recycling method of environment-friendly incineration ash according to claim 4, characterized in that: after the particle screening is finished, the centrifugal exhaust fan (3) stops running, then the air cylinder (5) drives the bottom door plate (10) to be opened, and stones, bricks, ceramic fragments, glass fragments and other metal particles fall into the waste material pool (11).
6. The recycling method of environment-friendly incineration ash according to claim 3, characterized in that: the ash is conveyed to a belt (14) in a frame (12) by a conveying pipe (2), the belt (14) is driven by a driving shaft (13) to run around a magnetic roller (15) fixed on a driven roller (16), at the moment, the ash firstly falls into an ash collecting box (18), and then ferrous metal is separated from the belt (14) and falls into a ferrous metal collecting box (19) under the action of gravity.
7. The recycling method of environment-friendly incineration ash according to claim 6, characterized in that: the ash is blocked between the upper end position between the ash collecting box (18) and the black metal collecting box (19) and the belt (14) through a partition plate (17), so that the ash is prevented from entering the black metal collecting box (19), and the partition plate (17) is positioned at the front end of the central axis of the magnetic drum (15).
8. The recycling method of environment-friendly incineration ash according to claim 1, characterized in that: the pressing pressure of the hydraulic machine is 25 tons to 35 tons.
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| CN202110068534.8A CN112679152A (en) | 2021-01-19 | 2021-01-19 | Environment-friendly incineration ash recycling method |
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| CN202110068534.8A CN112679152A (en) | 2021-01-19 | 2021-01-19 | Environment-friendly incineration ash recycling method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113319999A (en) * | 2021-07-03 | 2021-08-31 | 航天神禾(北京)环保有限公司 | System and method for manufacturing ceramic product by using fly ash and ceramic product manufactured by system and method |
| CN114100750A (en) * | 2021-11-15 | 2022-03-01 | 青岛东捷建设工程有限公司 | Waste treatment and separation device for civil engineering construction |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102092975A (en) * | 2010-12-08 | 2011-06-15 | 浙江工业大学 | Method for preparing concrete aggregate from waste incineration ash |
| CN108439874A (en) * | 2018-06-12 | 2018-08-24 | 上海秦望环保材料有限公司 | It is a kind of to produce non-burning brick preparation process using domestic waste incineration residue |
-
2021
- 2021-01-19 CN CN202110068534.8A patent/CN112679152A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102092975A (en) * | 2010-12-08 | 2011-06-15 | 浙江工业大学 | Method for preparing concrete aggregate from waste incineration ash |
| CN108439874A (en) * | 2018-06-12 | 2018-08-24 | 上海秦望环保材料有限公司 | It is a kind of to produce non-burning brick preparation process using domestic waste incineration residue |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113319999A (en) * | 2021-07-03 | 2021-08-31 | 航天神禾(北京)环保有限公司 | System and method for manufacturing ceramic product by using fly ash and ceramic product manufactured by system and method |
| CN114100750A (en) * | 2021-11-15 | 2022-03-01 | 青岛东捷建设工程有限公司 | Waste treatment and separation device for civil engineering construction |
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Application publication date: 20210420 |