CN114392828B - Comprehensive recycling treatment method for waste incineration power plant slag - Google Patents
Comprehensive recycling treatment method for waste incineration power plant slag Download PDFInfo
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- CN114392828B CN114392828B CN202210089140.5A CN202210089140A CN114392828B CN 114392828 B CN114392828 B CN 114392828B CN 202210089140 A CN202210089140 A CN 202210089140A CN 114392828 B CN114392828 B CN 114392828B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/30—Combinations with other devices, not otherwise provided for
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B15/00—Combinations of apparatus for separating solids from solids by dry methods applicable to bulk material, e.g. loose articles fit to be handled like bulk material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C2201/00—Codes relating to disintegrating devices adapted for specific materials
- B02C2201/06—Codes relating to disintegrating devices adapted for specific materials for garbage, waste or sewage
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Abstract
A comprehensive treatment method for recycling waste incineration power plant slag includes dividing the slag into coarse slag, fine slag and superfine slag according to particle size, using the fine slag and the crushed coarse slag as basic mixed slag, first separating the superfine slag after iron removal to obtain light materials and heavy materials, separating the heavy materials to obtain non-colored heavy metals and non-metal tailings, mixing the non-metal tailings and the light materials, separating to obtain combustible materials and particles, mixing the particles with part of the basic mixed slag to be used as building material raw materials, and mixing the rest basic mixed slag with kaolin and hydroxyapatite to be used as nucleation auxiliary agents of microcrystalline glass. The comprehensive treatment method can obtain recyclable products such as non-ferrous heavy metals, combustible materials, building material raw materials, microcrystalline glass forming aids and the like, and realizes the recycling comprehensive treatment of the waste incineration power plant slag.
Description
Technical Field
The invention relates to the technical field of incinerator slag treatment, in particular to a comprehensive recycling treatment method for waste incineration power plant slag.
Background
The municipal refuse treatment technology is mainly divided into three types of landfill, biochemical treatment and thermochemical treatment, and three types of landfill, composting and incineration are commonly used at present. The volume of the garbage is greatly reduced by burning, and the garbage becomes electric energy by burning the garbage. In order to meet the demand of urbanization development and relieve the increasing pressure of disposing urban domestic garbage, large domestic garbage incineration plants have been built in a plurality of cities in recent years. Incineration can greatly reduce the amount of household garbage (about 90% of the volume), but 20-30% of the mass of the household garbage is still left in the slag, and the generation of a large amount of ash slag brings difficulty in disposal. In order to save increasingly tense landfill sites and reduce the disposal cost of ash, the resource utilization of the incinerator slag is a feasible method which is more in line with the actual situation of China.
Disclosure of Invention
The invention aims to provide a new treatment idea for solving the problem of recycling of the waste incineration power plant slag, and particularly relates to a recycling comprehensive treatment method of the waste incineration power plant slag.
In order to solve the technical problems, the invention adopts the technical scheme that: a comprehensive treatment method for recycling waste incineration power plant slag includes dividing the slag into coarse slag, fine slag and superfine slag according to particle size, using the fine slag and the crushed coarse slag as basic mixed slag, first separating the superfine slag after iron removal to obtain light materials and heavy materials, separating the heavy materials to obtain non-colored heavy metals and non-metal tailings, mixing the non-metal tailings and the light materials, separating to obtain combustible materials and particles, mixing the particles with part of the basic mixed slag to be used as building material raw materials, and mixing the rest basic mixed slag with kaolin and hydroxyapatite to be used as nucleation auxiliary agents of microcrystalline glass.
The resource comprehensive treatment method of the waste incineration power plant slag is further optimized as follows: screening the incineration slag by a 10mm vibrating screen to obtain primary oversize products and primary undersize products, wherein the primary oversize products are used for sorting slag which is not completely incinerated, returning the slag to a power plant for continuous incineration, and leaving coarse slag; sieving the primary undersize product by a vibrating screen of 1mm to obtain a secondary oversize product and a secondary undersize product, wherein the secondary oversize product is fine furnace slag, and the secondary undersize product is ultrafine furnace slag; and (3) respectively removing iron from the coarse slag and the superfine slag, separating ferrous metal in the slag, transferring the coarse slag into a crusher after removing the iron to obtain slag with the particle size of 5-15mm, mixing the slag with the fine slag, removing the iron again, and further separating the ferrous metal in the slag to obtain the basic mixed slag.
The resource comprehensive treatment method of the waste incineration power plant slag is further optimized as follows: : the slag is connected with a first linear vibrating screen through a loader and a feeding hopper, oversize materials of the first linear vibrating screen are transferred to a transfer table through a conveying belt, the slag which is not completely burnt is sorted out, the rest coarse slag enters a crusher through the conveying belt, the materials crushed by the crusher are transferred to a mixing barrel through the conveying belt, undersize materials of the first linear vibrating screen enter a second linear vibrating screen through the conveying belt, oversize materials of the second linear vibrating screen are transferred to the mixing barrel through the conveying belt, and undersize materials of the second linear vibrating screen are sent to a jigger through the conveying belt.
The resource comprehensive treatment method of the waste incineration power plant slag is further optimized as follows: and suspension type permanent magnet iron removers are arranged above the conveying belts.
The resource comprehensive treatment method of the waste incineration power plant slag is further optimized as follows: mixing and uniformly mixing the base mixed slag, kaolin and hydroxyapatite according to the weight ratio of 1-5:1-5:1-2, and using the mixture as a nucleating aid for the microcrystalline glass.
The resource comprehensive treatment method of the waste incineration power plant slag is further optimized as follows: the superfine furnace slag is transferred to a jigger after being deironized, light materials in the furnace slag are positioned on the upper layer of the jigger, heavy materials flow into a slag water storage tank along with water through a discharge port of the jigger, after sedimentation, metal mixtures with heavier specific gravity settled at the bottom of a bed layer of the jigger are regularly cleaned out for metal classification, the furnace slag at the bottom of a bed layer of the jigger is placed in an eddy current separator, and non-ferrous heavy metals and non-metallic tailings can be obtained through separation through the treatment of the eddy current separator.
The resource comprehensive treatment method of the waste incineration power plant slag is further optimized as follows: the nonmetal tailings and the light materials on the upper layer of the jigger enter a vertical winnowing machine for winnowing, the light materials collected on the upper part are sent to an incinerator for combustion and utilization as combustible materials, and the heavy materials discharged from the lower part are mixed with the basic mixed slag to be used as building material raw materials.
The resource comprehensive treatment method of the waste incineration power plant slag is further optimized as follows: the jigger is a sawtooth wave jigger.
The invention has the following beneficial effects:
1. the comprehensive treatment method can obtain recyclable products such as colored heavy metals, combustible materials, building material raw materials, microcrystalline glass forming aids and the like, and realizes the recycling comprehensive treatment of the waste incineration power plant slag;
2. the comprehensive treatment method of the invention divides the slag into coarse slag, fine slag and superfine slag, utilizes the characteristic that heavy metal is easy to be enriched on superfine particles, only carries out the recovery and utilization of colored heavy metal aiming at the superfine slag, and the coarse slag and the fine slag only recover iron metal therein, and do not carry out the recovery and utilization of colored heavy metal any more, thereby greatly reducing the treatment pressure of the recovery of the colored heavy metal.
Drawings
FIG. 1 is a process flow chart of the comprehensive treatment method for recycling the slag of the waste incineration power plant.
Detailed Description
For a better understanding of the present invention, the following examples are included to further illustrate the present invention, but the present invention is not limited to the following examples.
A comprehensive treatment method for recycling waste incineration power plant slag comprises the following overall thought: the slag is divided into coarse slag, fine slag and superfine slag according to the particle size, the fine slag and the crushed coarse slag are used as base mixed slag, the superfine slag is subjected to iron removal and then is separated to obtain light materials and heavy materials, the heavy materials are separated to obtain non-colored heavy metals and non-metallic tailings, the non-metallic tailings and the light materials are mixed and then are separated to obtain combustible materials and particulate matters, the particulate matters are mixed with part of the base mixed slag and then are used as building materials, and the rest of the base mixed slag is mixed with kaolin and hydroxyapatite and is used as a nucleation auxiliary agent of the microcrystalline glass. The characteristic that heavy metal is easy to be enriched on ultrafine particles is utilized, colored heavy metal is recycled only aiming at ultrafine slag, only ferrous metal in the ultrafine slag is recycled from the coarse slag and the fine slag, the colored heavy metal is not recycled, the processing pressure for recycling the colored heavy metal can be greatly reduced, after the fine slag and the ultrafine slag are mixed with kaolin and hydroxyapatite, the colored heavy metal, silicon oxide, phosphorus and other components in the slag can be used as auxiliary agents of the microcrystalline glass, and through the special colored heavy metal recycling and processing thought, the processing workload is simplified, and the colored heavy metal components in the slag are fully utilized.
A comprehensive treatment method for recycling waste incineration power plant slag mainly comprises the following main treatment contents:
< screening and iron removal >
Screening the incineration slag by a 10mm vibrating screen to obtain primary oversize products and primary undersize products, wherein the primary oversize products are used for sorting slag which is not completely incinerated, returning the slag to a power plant for continuous incineration, and leaving coarse slag; and (3) sieving the primary undersize product by a 1mm vibrating screen to obtain a secondary oversize product and a secondary undersize product, wherein the secondary oversize product is fine furnace slag, and the secondary undersize product is ultrafine furnace slag.
Specifically, the method comprises the following steps: the slag is connected with a first linear vibrating screen through a loader and a feeding hopper, oversize materials of the first linear vibrating screen are transferred to a transfer table through a conveying belt, the slag which is not completely burnt is sorted out, the rest coarse slag enters a crusher through the conveying belt, the materials crushed by the crusher are transferred to a mixing barrel through the conveying belt, undersize materials of the first linear vibrating screen enter a second linear vibrating screen through the conveying belt, oversize materials of the second linear vibrating screen are transferred to the mixing barrel through the conveying belt, and undersize materials of the second linear vibrating screen are sent to a jigger through the conveying belt.
As for the apparatus used for the screening, screening apparatuses suitable for slag treatment are mainly fixed screens, cylindrical screens, vibrating screens and shaking screens. The most used of them are fixed screen, cylindrical screen and vibrating screen, and the embodiment uses linear vibrating screen.
The linear vibrating screen is driven by two vibrating motors during operation, and when the two vibrating motors rotate synchronously and reversely, the exciting forces generated by the eccentric blocks are offset in the direction parallel to the axes of the motors and are superposed into a resultant force in the direction perpendicular to the motor shafts, and the motion track of the vibrating screen is a straight line. The two motor shafts are inclined at an intentional angle relative to the screen surface, and under the combined action of exciting force and material self-gravity, the material is thrown up on the screen surface and makes a jumping forward linear motion, so that the purpose of screening and grading the material is achieved.
The vibrating screen eliminates the phenomenon of blocking the screen holes due to strong vibration of the screen surface, and is beneficial to screening materials. The screening method can be used for screening coarse, medium and fine particles, and can also be used for dewatering vibration and desliming screening. The working part of the vibrating screen is fixed and the materials are screened by sliding along the working surface.
The top of conveyer belt all sets up suspension type permanent magnet de-ironing separator, and this kind of permanent magnet de-ironing separator adopts high performance permanent magnetic material, and efficient magnetic circuit design can provide level and smooth, the magnetic force action face of large tracts of land and the biggest magnetic field degree of depth. Compared with the electromagnetic iron remover, the iron remover has the following advantages: the required upper part installation space is small, the operation cost is low, the operation is simple, the structure is stable, the faults are few, and the shutdown accident caused by power failure can be avoided. The self-heating of the iron remover is avoided, the magnetic field intensity cannot be changed under normal conditions, and the environment temperature of 30-90 ℃ cannot generate any adverse effect on the iron remover.
The ideal installation position for the suspended iron remover is directly above the parabola for the departure of the material from the conveyor belt, which installation maximizes the utilization of the full capacity of the iron remover if a suitable parabolic path can be formed. Because the material being processed moves directly towards the magnet surface, its own momentum aids in the capture of the stray iron by the magnetic field. When the belt speed is slower, the path of the material falling is closer to vertical and the magnet position must be moved back closer to the pulley. For low belt speeds, it may be desirable to install a non-magnetic pulley.
< treatment of coarse slag and Fine slag >
And (3) respectively removing iron from the coarse slag and the superfine slag, separating ferrous metal in the slag, transferring the coarse slag into a crusher after removing the iron to obtain slag with the particle size of 5-15mm, mixing the slag with the fine slag, removing the iron again, and further separating the ferrous metal in the slag to obtain the basic mixed slag.
The crushing of the slag mainly adopts a roller crusher, a jaw crusher, an impact crusher and a shear crusher, wherein the jaw crusher mainly utilizes the impact and extrusion functions, the roller crusher relies on the impact shearing and extrusion functions, and the hammer crusher utilizes the impact, friction and shearing functions. The hammer crusher is selected in the embodiment, and belongs to one type of impact crushers. The working principle is as follows: the material block fed into the crusher space is crushed for the first time after being violently collided by the rotor which rotates around the central shaft, then the material gets energy from the rotor and flies to the hard machine wall, the material block is crushed for the second time, the material rebounded in the impact process is crushed by the rotor again, the material which is difficult to crush is clamped and sheared by the rotor and the fixed plate, and the crushed product is discharged from the lower part. The bearing boxes of the hammer crusher are all made of steel castings, and each shaft box is fixed by four screws. The great potential safety hazard that the bearing box is abraded due to the loosening of the screw of the previous generation of hammer crusher products is changed. The same equipment is more scientific and more applicable. The crushing ratio is large, generally 10-25, the higher can reach 50, the production capacity is high, products are all available, excessive phenomena are few, the unit product energy consumption is low, the structure is simple, the equipment is light in weight, the operation and maintenance are simple and easy, and the like.
Mixing and uniformly mixing the base mixed slag, the kaolin and the hydroxyapatite according to the weight ratio of 1-5:1-5:1-2, and using the mixture as an auxiliary agent in the process of preparing the glass ceramics. In the process of preparing the microcrystalline glass, phosphorus and the colored heavy metal element in the auxiliary agent can be used as beneficial components. For example, phosphorus and colored heavy metal elements can be used as a nucleating agent or a coloring agent of the microcrystalline glass, and the softening temperature of the glass can be reduced in the process of softening the glass powder, so that the sintering process is accelerated.
< treatment of ultrafine slag >
The superfine furnace slag is transferred to a jigger after being deironized, light materials in the furnace slag are positioned on the upper layer of the jigger, heavy materials flow into a slag water storage tank along with water through a jigger discharge port, after sedimentation, metal mixtures with heavier specific gravity are settled at the bottom of a jig bed layer and are regularly cleaned out for metal classification, the furnace slag at the bottom of the jig bed layer is placed in an eddy current separator, and after treatment of the eddy current separator, nonferrous heavy metals and nonmetal tailings can be obtained through separation.
The jigger is a sawtooth wave jigger, the pulse curve of the sawtooth wave jigger is in a sawtooth waveform, the rising water flow is faster than the falling water flow, the rising time is short, the falling time is long, the looseness of a bed layer is enhanced, the suction effect is relieved, heavy ore particles in materials are fully settled, and the sorting capacity and the concentrate recovery rate of equipment are greatly improved. The selected material is fed on the bed layer, and forms a particle group system with bed stone and water. When the water flow impacts upwards, the particle group system is in a loose suspension state, then the ore particles with different light, heavy, large and small sizes have different settling velocities, and coarse particles with large density settle in the lower layer. When the water flow is reduced, a suction effect is generated, a separation phenomenon occurs, namely ore particles with large density and small granularity pass through gaps of coarse particles and enter a lower layer, and a particle group system is layered according to the density due to the fact that the diaphragm moves up and down for multiple times of circulation, so that a separation effect is achieved.
The nonmetal tailings and the light materials on the upper layer of the jigger enter a vertical winnowing machine for winnowing, the light materials collected on the upper part are sent to an incinerator for combustion and utilization as combustible materials, and the heavy materials discharged from the lower part are mixed with the basic mixed slag to be utilized as building material raw materials. The speed of the working gas of the vertical winnowing machine is 4.5-5.5m/s, and the combustible materials in the particles with the particle size of less than 20mm are recovered.
The comprehensive treatment method can obtain recyclable products such as non-ferrous heavy metals, combustible materials, building material raw materials, microcrystalline glass forming aids and the like, and realizes the recycling comprehensive treatment of the waste incineration power plant slag.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (6)
1. A comprehensive treatment method for recycling slag of a waste incineration power plant is characterized by comprising the following steps: dividing the slag into coarse slag, fine slag and superfine slag according to the particle size, taking the fine slag and the crushed coarse slag as basic mixed slag, separating the superfine slag after iron removal to obtain a light material and a heavy material, separating the heavy material to obtain a non-colored heavy metal and a non-metallic tailings, mixing the non-metallic tailings and the light material, separating to obtain a combustible material and a particulate matter, mixing the particulate matter with part of the basic mixed slag to be used as a building material raw material, and mixing the rest of the basic mixed slag with kaolin and hydroxyapatite to be used as a nucleation auxiliary agent of the microcrystalline glass;
specifically, the incineration slag is screened by a 10mm vibrating screen to obtain primary oversize products and primary undersize products, wherein the primary oversize products are used for sorting slag which is not completely incinerated, the slag is returned to a power plant for continuous incineration, and the rest is coarse slag; sieving the primary undersize product by a vibrating screen of 1mm to obtain a secondary oversize product and a secondary undersize product, wherein the secondary oversize product is fine furnace slag, and the secondary undersize product is ultrafine furnace slag; respectively removing iron from the coarse slag and the superfine slag, separating ferrous metal in the slag, transferring the coarse slag into a crusher after removing the iron to obtain slag with the particle size of 5-15mm, mixing the slag with the fine slag, removing the iron again, and further separating the ferrous metal in the slag to obtain base mixed slag;
the slag is connected with a first linear vibrating screen through a loader and a feeding hopper, oversize materials of the first linear vibrating screen are transferred to a transfer table through a conveying belt, the slag which is not completely burnt is sorted out, the rest coarse slag enters a crusher through the conveying belt, the materials crushed by the crusher are transferred to a mixing barrel through the conveying belt, undersize materials of the first linear vibrating screen enter a second linear vibrating screen through the conveying belt, oversize materials of the second linear vibrating screen are transferred to the mixing barrel through the conveying belt, and undersize materials of the second linear vibrating screen are sent to a jigger through the conveying belt.
2. The comprehensive treatment method for recycling the slag of the waste incineration power plant according to claim 1, characterized in that: and suspension type permanent magnet iron removers are arranged above the conveying belts.
3. The comprehensive treatment method for recycling the slag of the waste incineration power plant according to claim 1, characterized in that: mixing and uniformly mixing the base mixed slag, kaolin and hydroxyapatite according to the weight ratio of 1-5:1-5:1-2, and using the mixture as a nucleating aid for the microcrystalline glass.
4. The comprehensive treatment method for recycling the slag of the waste incineration power plant according to claim 1, characterized in that: the superfine furnace slag is transferred to a jigger after being deironized, light materials in the furnace slag are positioned on the upper layer of the jigger, heavy materials flow into a slag water storage tank along with water flow through a discharge port of the jigger, after sedimentation, metal mixtures with heavier specific gravity are settled at the bottom of a bed layer of the jigger and are regularly cleaned out for metal classification, the furnace slag at the bottom of a bed layer of the jigger is placed in an eddy current separator, and after treatment of the eddy current separator, nonferrous heavy metals and nonmetal tailings can be obtained through separation.
5. The comprehensive treatment method for recycling the slag of the waste incineration power plant as claimed in claim 4, wherein: the nonmetal tailings and the light materials on the upper layer of the jigger enter a vertical winnowing machine for winnowing, the light materials collected on the upper part are sent to an incinerator for combustion and utilization as combustible materials, and the heavy materials discharged from the lower part are mixed with the basic mixed slag to be used as building material raw materials.
6. The comprehensive treatment method for recycling the slag of the waste incineration power plant according to claim 1, characterized in that: the jigger is a sawtooth wave jigger.
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| CA2418020C (en) * | 2003-02-04 | 2011-09-13 | Jean Brodeur | Steel slag processing jig system |
| PL2794941T3 (en) * | 2011-10-20 | 2020-05-18 | Orbix Productions | Method for recycling waste water from a stainless steel slag treatment process |
| EP2818250B1 (en) * | 2013-06-27 | 2019-11-20 | NUA Abfallwirtschaft GmbH | Method for the treatment of refuse incineration slag |
| CN105195313B (en) * | 2015-08-24 | 2017-07-28 | 同济大学 | The method that metal and combustible are reclaimed from domestic waste incineration residue |
| CN105921484B (en) * | 2016-05-04 | 2017-12-01 | 扬州市同创再生资源有限公司 | A kind of method of MSW Incineration Plant comprehensive utilization of slag |
| CN109731673A (en) * | 2019-03-16 | 2019-05-10 | 德州群峰机械制造有限公司 | A kind of waste incinerator residues processing technique |
| CN110420969B (en) * | 2019-08-02 | 2021-11-23 | 宇创环保产业有限公司 | Dry-method resource utilization system for household garbage incineration power generation slag |
| CN112845523A (en) * | 2020-12-31 | 2021-05-28 | 广东忠能科技集团有限公司 | Integrated platform is handled to slag |
| CN112871990A (en) * | 2021-01-29 | 2021-06-01 | 广东中翔环保建材有限公司 | System for carry out resource recovery from waste incineration slag |
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