CN113751186B

CN113751186B - Process method for recovering refined carbon powder-glass beads from gasified coarse slag

Info

Publication number: CN113751186B
Application number: CN202110572257.4A
Authority: CN
Inventors: 彭团儿; 刘广学; 常学勇; 郭珍旭; 赵平; 赵恒勤; 马驰; 张然
Original assignee: Zhengzhou Institute of Multipurpose Utilization of Mineral Resources CAGS
Current assignee: Zhengzhou Institute of Multipurpose Utilization of Mineral Resources CAGS
Priority date: 2021-05-25
Filing date: 2021-05-25
Publication date: 2023-04-07
Anticipated expiration: 2041-05-25
Also published as: CN113751186A

Abstract

The invention provides a process method for recovering refined carbon powder-glass beads from gasified coarse slag, which comprises the following steps: stirring and mixing the gasified coarse slag and water, and screening the gasified slag slurry by No. 1 to obtain No. 1 coarse-grain low-carbon tailings and No. 1 fine-grain slag slurry; 1# fine grain slag slurry is subjected to reselection-3 # screening to prepare carbon powder and secondary carbon powder; grinding, screening, cleaning and screening heavy minerals in gravity separation operation to obtain fine-fraction slag slurry and coarse-fraction minerals, carrying out magnetic separation operation on the coarse-fraction minerals to obtain magnetic substances and nonmagnetic substances, concentrating and dehydrating the magnetic substances to obtain iron-containing glass beads, and carrying out classification operation on the nonmagnetic substances to obtain glass beads with different grain fractions. The method does not need to adopt chemical agents, realizes the recovery of the carbon residue of the gasified coarse slag and the graded utilization of the glass beads, has high ignition loss and recovery rate of the recovered carbon powder, uniform granularity, low impurity content and good sphericity of the recovered glass bead products, ensures that the resource utilization rate of the gasified slag is more than 50 percent and the reduction of the solid waste volume is more than 70 percent.

Description

Process method for recovering refined carbon powder-glass beads from gasified coarse slag

Technical Field

The invention relates to the technical field of comprehensive utilization of solid wastes, in particular to a process method for recovering carbon powder-glass beads from gasified coarse slag.

Background

Coal gasification is a leading and core technology for converting solid coal into gas clean energy in the field of coal chemical industry, and is an important direction for coal resources and energy utilization. In coal gasification systems, the inorganic mineral constituents associated with the raw coal, the added catalyst and the carbonaceous material remaining from incomplete gasification are discharged as a residue (coal gasification slag). The gasified slag is divided into coarse slag and fine slag according to different discharge modes. The coarse slag, namely slurried coal particles are subjected to processes of melting, water quenching, chilling, condensation and the like under the high-temperature and high-pressure condition of the gasification furnace, and the water-containing slag discharged from a slag discharge lock hopper at the bottom of the gasification furnace has large fluctuation of 10-30% of residual carbon along with coal types, gasification furnace types and gasification furnace operating conditions, the particle size is intensively distributed between 16 meshes and 4 meshes, and the generated amount accounts for about 60-80% of the discharge amount of the gasification slag. The problems of large output, high carbon residue, high water content, difficult utilization, high cost and the like of the gasified slag are restricted, the comprehensive utilization progress of the gasified slag is slow, the comprehensive utilization rate is low, the gasified slag is mainly treated by centralized clearing and slag yard stockpiling at present, the stockpiled slag is black powder, and the problems of land occupation, environmental pollution and resource waste are prominent.

The gasified slag mainly comprises incompletely gasified carbon powder and a glass melt formed in the process of gasifying ash. The carbon-slag separation is necessary for the reduction and resource utilization of the gasified slag. Because of the structural characteristics of carbon residue rich pores in the gasified slag, the method has strong adsorbability to medicaments, large medicament dosage and high cost in a flotation method, and because the use of the medicaments increases the viscosity of ore pulp, the dehydration difficulty of products is increased; the gravity-magnetic combined process is also adopted to realize the effective separation of high-carbon, carbon-rich and high-ash products, but the ash slag has high hardness, sharp edges and corners and large feeding pressure, which causes large abrasion of conveying equipment and sorting equipment and high energy consumption, and causes the secondary crushing of soft carbon powder to reduce the recovery rate of the carbon powder. The ash content of the discontinuous phase in the carbon block forms glass beads in the gasification process, the granularity is fine, the sphericity is high, and the glass beads can be used for heat insulation materials and rubber and plastic fillers. The recovery and graded utilization of glass beads in gasified coarse slag are only reported.

Disclosure of Invention

The invention provides a process method for recovering carbon fine powder-glass beads from gasified coarse slag, which adopts a green pollution-free physical separation technology to realize recovery of carbon residue from the gasified coarse slag and graded utilization of the glass beads. The loss of ignition of the recovered carbon fine powder is more than 80%, the recovery rate of the carbon fine powder and the secondary carbon fine powder is more than 85%, the recovered glass bead product has uniform granularity, low impurity content and good sphericity, the resource utilization rate of gasified slag is more than 50%, and the volume reduction of solid waste is more than 70%.

The technical scheme of the invention is realized as follows: a process method for recovering refined carbon powder-glass beads from gasified coarse slag comprises the following steps:

(1) Screening and tailing discarding: conveying the gasified coarse slag in a slag settling tank of the gasification furnace into a stirring barrel, stirring and mixing the gasified coarse slag and water in a stirring barrel to obtain gasified slag slurry with the concentration of 45-50%, and screening the gasified slag slurry by No. 1 to obtain No. 1 coarse-grain low-carbon tailings and No. 1 fine-grain slag slurry;

(2) And (3) carbon powder recovery and classification: 1# fine grain slag slurry is subjected to gravity concentration and rough concentration to obtain rough concentration heavy minerals, rough concentration medium minerals and rough concentration light minerals, the rough concentration light minerals are subjected to 3# screening and grading to obtain 3# coarse grain grade materials and 3# fine grain grade materials, the rough concentration medium minerals are subjected to gravity concentration and scavenging to obtain scavenging heavy minerals and scavenging light minerals, the scavenging light minerals and the 3# coarse grain grade materials are combined and dehydrated to obtain dehydrated overflow water and wet minerals, the wet minerals are dried to obtain 1 carbon fine powder, and the dehydrated overflow water and the 3# fine grain grade materials are combined and concentrated and dehydrated to obtain 2 secondary carbon powder of the product;

(3) And (3) recovering and grading glass beads: combining the roughing heavy minerals and the scavenging heavy minerals, then performing shaping-4 # screening operation to obtain mixed size grade glass bead materials, cleaning-5 # screening the mixed size grade glass bead materials to obtain 5# fine grain slag slurry and clean mixed size grade glass beads, performing magnetic separation operation on the clean mixed size grade glass beads to obtain magnetic substances and nonmagnetic substances, concentrating and dehydrating the magnetic substances to obtain 3 magnetic glass beads of products, and performing fine classification on the nonmagnetic substances to obtain glass beads of different size grades;

(4) Deep processing of coarse grain tailings: scrubbing the 1# coarse-grain low-carbon tailings in the step (1) and screening the coarse-grain low-carbon tailings by a 2# screen to obtain 2# fine slag slurry and 2# coarse-grain products, dehydrating the 2# coarse-grain products to obtain 7 # amorphous coarse slag, combining the 2# fine slag slurry and 5# fine slag slurry, and concentrating and dehydrating to obtain 8 # high-ash fine slag.

Further, in the step (3), the non-magnetic substance enters a fine grading operation, the fine grading operation comprises first-stage grading and second-stage grading, the first-stage graded fine particles enter second-stage grading, the first-stage graded coarse particles are concentrated and dehydrated to obtain a product 4 coarse-grain glass beads, the second-stage graded coarse particles are concentrated and dehydrated to obtain a product 5 medium-grain glass beads, and the second-stage graded fine particles are concentrated and dehydrated to obtain a product 6 fine-grain glass beads.

Further, in the step (2) and the step (3), the concentrated overflow water generated in the concentration operation is combined with the 2# fine slag slurry and the 5# fine slag slurry and then concentrated to obtain concentrated slag slurry, the concentrated slag slurry is dehydrated to obtain 8 high-ash fine slag, and the concentrated overflow water generated in the process of preparing the concentrated slag slurry is returned to the stirring barrel in the step (1) for recycling.

Further, the reselection roughing in the step (1) comprises a first stage reselection and a second stage reselection, light minerals of the first stage reselection enter the second stage reselection, heavy minerals of the first stage reselection and the second stage reselection are combined into roughing heavy minerals, and the roughing heavy minerals enter a shaping-4 # screening step.

Further, the magnetic separation operation in the step (3) comprises first-stage magnetic separation and second-stage magnetic separation, wherein the first-stage magnetic separation is medium-field strong magnetic separation, and the second-stage magnetic separation is high-gradient magnetic separation.

Further, the gravity roughing and gravity concentration in the step (2) adopt one or more of a centrifugal force field disc type separator, a check spiral chute, a dense medium separator and a heavy liquid separator.

Further, reselection roughing or reselection concentration adopts a check spiral chute, the check spiral chute comprises a central column, a spiral groove main body is arranged on the outer side of the central column, an engraved groove is spirally arranged on the groove face of the upper side of the spiral groove main body, one end of the engraved groove is located on the outer edge of the groove face, the other end of the engraved groove extends to the central column in a spiral mode, the cross section of the engraved groove is a V-shaped groove, and the included angle between the engraved groove and the motion track of the slurry is 120 degrees.

Furthermore, the groove surfaces on the two sides of the V-shaped groove have the same inclination angle, or the groove surface on the outer side of the V-shaped groove is perpendicular to the groove surface on the upper side of the spiral groove body, and the groove surface on the inner side extends downwards to the groove surface on the outer side.

Furthermore, the concave heavy mineral shunt channel and the concave light mineral shunt channel are provided with a boundary weir at one side close to the V-shaped groove.

Further, the cleaning in the step (3) is ultrasonic cleaning.

The invention has the beneficial effects that:

1. the invention provides a method for comprehensively recovering high-heat-value carbon fine powder and glass beads from gasified coarse slag in a slag settling tank of a gasification furnace;

2. the ignition loss of the recovered carbon fine powder is high, the recovery rate is high, the ignition loss of the carbon fine powder is more than 80 percent, and the comprehensive carbon recovery rate of the carbon fine powder and secondary carbon powder is more than 85 percent; the recovered carbon powder can be used for cyclic gasification, thermoelectric co-combustion or preparation of an active carbon adsorption material;

3. the gasified slag does not need to be dehydrated, drained and transferred to and from a slag yard for disposal, the process is directly adopted for carbon powder recovery and glass bead recovery, the solid waste resource is more than 50 percent, the volume reduction is more than 70 percent, the solid waste disposal cost is low, and the comprehensive benefit is good;

4. through scrubbing and shaping, attachments on the surfaces of the micro-beads are stripped, carbon powder particles are not completely separated through grinding, and the sphericity of the glass micro-beads is improved. Through cleaning and fine grading, the impurity content of the glass bead product is reduced, and the granularity uniformity of the glass beads is improved.

5. Magnetic separation is carried out by two sections of magnetic separation, so that the magnetic glass beads are separated and comprehensively utilized;

6. the non-magnetic mixed-size glass bead wet classification has high classification efficiency and large treatment capacity, is suitable for recovering glass beads from gasified coarse slag in a large scale, and can realize industrial popularization and application;

7. the water used in the whole process is recycled by 100 percent, and zero discharge of waste water is realized;

8. the amorphous aluminum-silicon-based coarse slag of the recycled product 7 can replace machine-made sand to be used for building material doping amount or main road subgrade.

9. The gravity separation process mainly using the special check spiral chute is favorable for further improving the enrichment ratio and the recovery rate of the carbon residue product, and the processing capacity of single equipment is improved by 10-12 percent compared with the traditional chute. The multiple spiral chute equipment has the advantages of simple structure, high separation efficiency, no moving parts, energy conservation, consumption reduction, small occupied area, large treatment capacity and suitability for industrial popularization and application.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a process flow diagram of the present invention;

FIG. 2 is a flow chart of a process according to the first embodiment;

FIG. 3 is a top view of a spiral chute with multiple grooves;

FIG. 4 is a schematic view of a V-shaped groove structure with the same groove surface inclination angle;

FIG. 5 is a schematic view of a V-shaped groove structure with different groove surface inclination angles;

FIG. 6 is a schematic diagram of an angle structure between the movement tracks of the notch and the slurry;

FIG. 7 is a cross-sectional view of a helical groove body.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.

As shown in figure 1, a process method for recovering refined carbon powder-glass beads from gasified coarse slag comprises the following steps:

(1) Screening and tailing discarding: conveying the gasified coarse slag in a slag settling tank of the gasification furnace into a stirring barrel, stirring and mixing the gasified coarse slag and water in a stirring barrel to make slurry to obtain gasified slag slurry with the concentration of 45-50%, screening the gasified slag slurry by using a 1# sieve to obtain 1# coarse-grain low-carbon tailings and 1# fine-grain slag slurry, wherein the aperture of a sieve hole for screening the 1# sieve is 0.6-1.8mm, the 1# coarse-grain low-carbon tailings can be directly used as building sand or can be used by deep processing and classification, and the undersize fine-grain slag slurry enters reselection operation to recover carbon powder;

(2) And (3) carbon powder recovery and classification: 1# fine grain slag slurry is subjected to gravity concentration and rough concentration to obtain rough concentration heavy minerals, rough concentration medium minerals and rough concentration light minerals, the rough concentration light minerals are subjected to 3# screening and grading to obtain 3# coarse grain grade materials and 3# fine grain grade materials, the rough concentration medium minerals are subjected to gravity concentration and scavenging to obtain scavenging heavy minerals and scavenging light minerals, the scavenging light minerals and the 3# coarse grain grade materials are combined and dehydrated to obtain dehydrated overflow water and wet minerals, the wet minerals are dried to obtain 1 carbon fine powder, and the dehydrated overflow water and the 3# undersize materials are combined and concentrated and dehydrated to obtain 2 secondary carbon powder of the product; the operation concentration of the gravity roughing and the gravity scavenging is 35 to 50 percent;

(3) And (3) recovering and grading glass beads: and combining the roughly selected heavy minerals and the scavenged heavy minerals, and then carrying out shaping-4 # screening operation to obtain the mixed-size glass beads, wherein the shaping operation adopts a vertical mill, the operation concentration is 55-65%, and the aperture range of 4# screening is 0.35-0.7mm. After a product of the shaping operation is cleaned and sieved by No. 5, 5# fine grain slurry and clean mixed size-class glass beads (the glass beads are short for glass micro beads) are obtained, the cleaning is ultrasonic cleaning, the ultrasonic cleaning frequency is 28KHZ, the concentration of a feed material in the magnetic separation operation is 25-35%, magnetic materials and non-magnetic materials are obtained after the clean mixed size-class glass beads are subjected to the magnetic separation operation, the magnetic materials are concentrated and dehydrated to obtain 3 magnetic glass beads (iron-containing glass beads) of the product, and the non-magnetic materials are subjected to fine classification operation to obtain glass beads of different size classes;

(4) Deep processing of coarse grain tailings: scrubbing and 2# screening the 1# coarse grain low-carbon tailings in the step (1) to obtain 2# fine slag slurry and 2# coarse grain products, wherein the scrubbing concentration is 55-65%, and the size range of the 2# fine slag slurry is 0.1-0.5mm. And (3) mixing the 2# fine slag slurry which is carbon powder and glass melt scraps with the 5# fine slag slurry in the step (3), and concentrating and dehydrating to obtain the 8 # high-ash fine slag. The No. 2 coarse grain product is product 7 amorphous coarse slag, the particle size range of the amorphous coarse slag is 0.5-4.5mm, and the amorphous coarse slag is used as building sand for brick making, road repairing and other building engineering;

in the step (3), the non-magnetic substance enters a fine classification operation, the fine classification operation comprises a first-stage classification and a second-stage classification, the first-stage classified fine particles enter the second-stage classification, the first-stage classified coarse particles are concentrated and dehydrated to obtain products 4 coarse particle glass beads, the second-stage classified coarse particles are concentrated and dehydrated to obtain products 5 medium particle glass beads, the second-stage classified fine particles are concentrated and dehydrated to obtain products 6 fine particle glass beads, the particle size range of the coarse particle glass beads is 0.3-0.8mm, the particle size range of the medium particle glass beads is 0.1-0.5mm, and the particle size range of the fine particle glass beads is 0.031-0.25mm.

And (3) performing solid-liquid separation on secondary carbon powder in the step (2) to obtain wastewater, performing solid-liquid separation on the 5# fine slag slurry and the glass beads with different grain sizes in the step (3) to obtain wastewater, combining and concentrating the 2# fine slag slurry in the step (4) to obtain concentrated slag slurry, and performing solid-liquid separation and dehydration on the concentrated slag slurry to obtain the 8 high-ash fine slag. And (2) separating solid waste of the concentrated residue slurry to obtain clear water, and returning the clear water to the stirring barrel in the step (1) for recycling. The gravity roughing in the step (1) comprises first stage gravity separation and second stage gravity separation, light minerals subjected to first stage gravity separation enter second stage gravity separation, heavy minerals subjected to first stage gravity separation and second stage gravity separation are combined and enter grinding-4 # screening operation.

The magnetic separation operation in the step (3) comprises first-stage magnetic separation and second-stage magnetic separation, wherein the first-stage magnetic separation is medium-field strong magnetic separation, the second-stage magnetic separation is high-gradient magnetic separation, the first-stage magnetic separation adopts a semi-counter-current roller type permanent magnetic separator with the magnetic field intensity of 6000-8000Gs or a plate type permanent magnetic separator with the magnetic field intensity of 8000-12000Gs, and the second-stage magnetic separation is a high-gradient vertical ring magnetic separator with the magnetic field intensity of 12000Gs-18000 Gs.

And (3) adopting one or more of a centrifugal force field disc type separator, a check spiral chute, a dense medium separator, a heavy liquid separator and a shaking table for gravity roughing or gravity scavenging in the step (2).

The reselection roughing or reselection selection adopts a check spiral chute, as shown in fig. 3-7, the check spiral chute comprises a central column 1, a spiral groove main body 2 is arranged on the outer side of the central column 1, an engraved groove 3 is spirally arranged on the groove surface of the upper side of the spiral groove main body 2, one end of the engraved groove 3 is positioned on the outer edge of the groove surface, the other end of the engraved groove 3 spirally extends to the central column 1, the cross section of the engraved groove 3 is a V-shaped groove 4, and the included angle between the engraved groove 3 and the motion track 5 of the slurry is 120 degrees.

The groove surfaces on the two sides of the V-shaped groove 4 have the same inclination angle, or the groove surface on the outer side of the V-shaped groove 4 is vertical to the groove surface on the upper side of the spiral groove main body, and the groove surface on the inner side extends downwards to the groove surface on the outer side.

The inboard that the helicla flute main part 2 is close to center post 1 is provided with concave type heavy mineral reposition of redundant personnel passageway 6, the outside is provided with concave type light mineral reposition of redundant personnel passageway 7, the top of helicla flute main part 2 is provided with adds water spot 8, it is located between concave type heavy mineral reposition of redundant personnel passageway 6 and the concave type light mineral reposition of redundant personnel passageway 7 to add water spot 8, one side that concave type heavy mineral reposition of redundant personnel passageway 6 and concave type light mineral reposition of redundant personnel passageway 7 are close to cutting 3 all is provided with demarcation weir 9 for distinguish district and runner, be provided with the ore deposit flashboard (not drawn in the picture) of leading that can open on the demarcation weir 9. The concave heavy mineral shunt channel 6 is used for separating low-carbon heavy minerals in advance and does not need to be repeatedly sorted in equipment. The concave light mineral diversion channel 7 is used for separating qualified low specific gravity light minerals in advance and does not need to be repeatedly sorted in equipment. And a water replenishing point is arranged, and because part of qualified heavy minerals and light minerals are shunted in advance, the water quantity is reduced, water needs to be replenished, and the residual middlings are subjected to secondary pulp making, so that the separation efficiency and the single-machine equipment processing capacity are improved.

The common spiral chute is a result of water flow expanding to the outer edge in the rotary motion; the dewatering phenomenon often appears near the inner layer flow zone, so that the layering is difficult to effectively carry out, the middling quantity is increased, and the quality of the concentrate is reduced. The special low-specific gravity gasified slag check spiral chute is mainly structurally the same as a conventional chute, and mainly comprises six parts, namely a uniform divider, an ore feeding groove, a spiral groove main body, a product intercepting groove, an ore receiving hopper and a groove support, wherein the special low-specific gravity gasified slag check spiral chute is characterized in that a V-shaped groove 4 is arranged on the upper side surface of a spiral groove main body 2 on a separation working surface of the notch groove chute, the V-shaped groove 4 is used as a medium ore check diversion groove, so that particles with large specific gravity moving towards the bottom are intensively guided to a position close to the inner side, the comprehensive resistance borne by the particles with large specific gravity moving towards the outer side is increased, lighter particles with small specific gravity move on the heavy particles in a floating mode, the particles with small specific gravity are influenced by the resistance of the notch groove and flow towards the outer side more quickly under the action of centrifugal force, so that the separation effect of the mineral particles with different specific gravity is more obvious, meanwhile, the ore layer is thickened, the loose layering effect is enhanced, coarse-grained light minerals separated from an ore belt and move to the outer edge, and the heavy minerals at the bottom layer flows towards the inner edge along the notch groove. Compared with the conventional non-grooved spiral chute, the ore concentrate grade is improved by 3-5%, the recovery rate is improved by 5-10%, and the comprehensive separation efficiency is improved by 5-10%. The cross section of the grooved spiral chute is a cubic parabola, and the slope change of the curve is particularly suitable for the selection of the gasified slag materials. The equipment has the advantages of simple structure, no moving parts, easy manufacture, light weight, convenient configuration, installation and maintenance and the like.

The following description is given with reference to specific examples:

the crude slag gasified by Shaanxi chemical enterprises has the raw ore ignition loss of 23.14 percent and Fe ₂ O ₃ The content is 10.17%, and other chemical components mainly comprise silicon dioxide, aluminum oxide and ferric oxide. By adopting the process flow shown in FIG. 2, the aperture of the 1# sieve is 0.6mm, the aperture of the 4# sieve is 0.70mm, the first-stage magnetic separation adopts a semi-counterflow roller-type permanent magnet separator with the magnetic field intensity of 8000Gs, the second-stage magnetic separation adopts a high-gradient vertical ring magnetic separator with the magnetic field intensity of 12000Gs, and both the first-stage reselection and the second-stage reselection adopt a spiral chute with multiple notches, so that the following products are obtained:

product 1 carbon fine powder: the yield is 16.20%, the ignition loss is 81.32%, the carbon recovery rate is 56.93% of refined carbon powder, and the product can realize circulating gasification, thermoelectric mixed combustion or secondary sale through dehydration and drying treatment;

product 2 secondary carbon powder: the yield is 10.48%, the loss on ignition is 63.45%, the carbon recovery rate is 28.73% of secondary carbon powder, and the product can realize circulation gasification, thermoelectric co-combustion or secondary sale through dehydration and drying treatment;

the total yield of the series glass bead products is 19.24 percent, the loss on ignition is 0.78 percent, and Fe ₂ O ₃ The content is 16.13%, wherein, the product 3 is magnetic glass beads: the yield was 6.35%, the loss on ignition was 0.63%, and Fe ₂ O ₃ The content is 39.13%; product 4 coarse grain glass beads: yield 3.53%, fe ₂ O ₃ The content is 2.89%, and the particle size range is +300-450 mu m; product 5 medium bead: yield 5.31%, fe ₂ O ₃ The content is 4.78%, and the particle size range is +150-250 μm; product 6 fine-grain glass beads: yield 4.04%, fe ₂ O ₃ The content is 6.47%, and the particle size range is +31-150 μm;

product 8, high ash and fine slag: the yield was 14.41%, the loss on ignition was 19.45%, and Fe ₂ O ₃ The content was 9.73%, and the carbon recovery was 12.11%.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A process method for recovering refined carbon powder-glass beads from gasified coarse slag is characterized by comprising the following steps:

(1) Screening and tailing discarding: conveying the gasified coarse slag in the slag settling tank into a stirring barrel, stirring and mixing the gasified coarse slag and water in a stirring barrel to obtain gasified slag slurry with the concentration of 45-50%, and screening the gasified slag slurry by No. 1 to obtain No. 1 coarse grain low-carbon tailings and No. 1 fine grain slag slurry;

(2) And (3) recycling and grading carbon powder: carrying out gravity concentration and rough concentration on the 1# fine grain slag slurry to obtain rough concentration heavy minerals, rough concentration medium minerals and rough concentration light minerals, screening and grading the rough concentration light minerals through 3# to obtain 3# coarse grain grade materials and 3# fine grain grade materials, carrying out gravity concentration and scavenging on the rough concentration medium minerals to obtain scavenging heavy minerals and scavenging light minerals, combining the scavenging light minerals and the 3# coarse grain grade materials, dehydrating to obtain dehydrated overflow water and wet minerals, drying the wet minerals to obtain 1 carbon fine powder, combining the dehydrated overflow water and the 3# fine grain grade materials, concentrating and dehydrating to obtain 2 secondary carbon powder of the product;

(3) And (3) recovering and grading glass beads: combining the roughing heavy minerals and the scavenging heavy minerals, shaping and screening by No. 4 to obtain mixed size glass bead materials, cleaning and screening the mixed size glass bead materials by No. 5 to obtain 5# fine grain slag slurry and clean mixed size glass beads, performing magnetic separation on the clean mixed size glass beads to obtain magnetic substances and nonmagnetic substances, concentrating and dehydrating the magnetic substances to obtain 3 magnetic glass beads of products, and finely classifying the nonmagnetic substances to obtain glass beads of different size fractions;

2. The process for recovering fine carbon powder-glass beads from gasified coarse slag according to claim 1, wherein in the step (3), the non-magnetic substance is subjected to a fine classification operation, the fine classification operation comprises a first-stage classification and a second-stage classification, fine substances obtained in the first-stage classification are subjected to the second-stage classification, coarse substances obtained in the first-stage classification are concentrated and dehydrated to obtain a product 4 of coarse-grain glass beads, coarse substances obtained in the second-stage classification are concentrated and dehydrated to obtain a product 5 of medium-grain glass beads, and fine substances obtained in the second-stage classification are concentrated and dehydrated to obtain a product 6 of fine-grain glass beads.

3. The process method for recovering the fine carbon powder-glass beads from the gasified coarse slag according to claim 2, wherein in the step (2) and the step (3), the concentrated overflow water generated in the concentration operation is combined with the 2# fine slag slurry and the 5# fine slag slurry and then concentrated to obtain the concentrated slag slurry, the concentrated slag slurry is dehydrated to obtain the 8-high-ash fine slag, and the concentrated overflow water generated in the process of preparing the concentrated slag slurry is returned to the stirring barrel in the step (1) for recycling.

4. The process method for recovering refined carbon powder-glass microspheres from gasified coarse slag according to claim 1, wherein the gravity concentration and roughing in the step (1) comprises a first-stage gravity concentration and a second-stage gravity concentration, light minerals in the first-stage gravity concentration enter the second-stage gravity concentration, heavy minerals in the first-stage gravity concentration and the second-stage gravity concentration are combined into roughed heavy minerals, and the roughed heavy minerals enter a shaping-4 # screening operation.

5. The process method for recovering refined carbon powder-glass microspheres from gasified coarse slag according to claim 1, wherein the magnetic separation operation in the step (3) comprises a first-stage magnetic separation and a second-stage magnetic separation, the first-stage magnetic separation is medium-field strong magnetic separation, and the second-stage magnetic separation is high-gradient magnetic separation.

6. The process method for recovering refined carbon powder-glass microspheres from gasified coarse slag according to claim 1, wherein the gravity roughing and the gravity scavenging in the step (2) adopt one or more of a centrifugal field disk type separator, a check spiral chute, a dense medium separator and a dense liquid concentrator.

7. The process method for recovering refined carbon powder-glass microspheres from coarse gasification slag according to claim 1, wherein a check spiral chute is adopted for coarse reselection or scavenging, the check spiral chute comprises a central column, a spiral groove main body is arranged on the outer side of the central column, an engraved groove is spirally arranged on the groove surface on the upper side of the spiral groove main body, one end of the engraved groove is positioned on the outer edge of the groove surface, the other end of the engraved groove extends to the central column, the cross section of the engraved groove is a V-shaped groove, and the included angle between the engraved groove and the motion track of the slurry is 120 degrees.

8. The process for recycling refined carbon powder-glass microspheres from coarse gasification slag according to claim 7, wherein the groove surfaces on both sides of the V-shaped groove have the same inclination angle, or the groove surface on the outer side of the V-shaped groove is perpendicular to the groove surface on the upper side of the spiral groove body, and the groove surface on the inner side is inclined and extends downwards to the groove surface on the outer side.

9. The process for recovering refined carbon powder-glass microspheres from coarse gasification slag according to claim 7, wherein the concave heavy mineral diversion channel and the concave light mineral diversion channel are provided with a dividing weir at one side close to the V-shaped groove.

10. The process for recovering refined carbon powder-glass microspheres from gasified coarse slag according to claim 1, wherein the cleaning in step (3) is ultrasonic cleaning.