CN113751192A - Method for preparing sand by using machine for tail slag after carbon extraction and recovery of gasified coarse slag and residual carbon - Google Patents
Method for preparing sand by using machine for tail slag after carbon extraction and recovery of gasified coarse slag and residual carbon Download PDFInfo
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- CN113751192A CN113751192A CN202110778336.0A CN202110778336A CN113751192A CN 113751192 A CN113751192 A CN 113751192A CN 202110778336 A CN202110778336 A CN 202110778336A CN 113751192 A CN113751192 A CN 113751192A
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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
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
- B03B9/04—General arrangement of separating plant, e.g. flow sheets specially adapted for furnace residues, smeltings, or foundry slags
Abstract
The invention provides a method for preparing sand by a tail slag preparation machine after gasification coarse slag carbon residue recovery and carbon extraction, which comprises the following steps: stirring and mixing the gasified coarse slag and water to obtain gasified slag slurry, screening the gasified slag slurry by No. 1, and shaping and screening coarse-grained slag on a screen; performing multi-stage gravity separation on the undersize fine grain slag slurry to obtain gravity separated light minerals and gravity separated heavy minerals, screening the gravity separated light minerals through No. 2 to obtain oversize minerals and undersize minerals, and dehydrating and drying the oversize minerals to obtain refined carbon powder; heavy minerals are reselected and subjected to shaping-screening operation to obtain oversize products and undersize products, the oversize products are dehydrated to obtain fine sand, the undersize products and undersize residues are combined and then subjected to reselection operation, heavy materials are reselected and subjected to concentration and dehydration to obtain comprehensive tailings, light materials are reselected and combined with undersize minerals, and secondary carbon powder is obtained through concentration and dehydration. The loss on ignition of the refined carbon powder is more than 80%, the comprehensive recovery rate of the refined carbon powder and the secondary carbon powder is more than 85%, the recovery rate of the carbon powder is improved, and the impurity content of a sandy product is reduced.
Description
Technical Field
The invention relates to the field of comprehensive utilization of solid waste of gasified slag in coal chemical industry, in particular to a method for preparing sand by a preparation machine of tailings after carbon extraction from gasified coarse slag and carbon residue.
Background
The gasification coarse slag is water-containing slag which is discharged from a slag discharge lock hopper at the bottom of the gasification furnace after the 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, the residual carbon quantity greatly fluctuates along with the coal type, the type of the gasification furnace and the operation condition of the gasification furnace, the residual carbon quantity is generally 10-30%, the particle size is intensively distributed between 16 meshes and 4 meshes, and the generated quantity accounts for about 60-80% of the discharge quantity of the gasification slag.
CN111644263A discloses a combined separation process for realizing carbon-ash separation of gasified slag, which uses a water medium cyclone and a classification cyclone to realize carbon-ash separation, and then realizes effective separation of high-carbon, carbon-rich and high-ash products by a magnetic separation-flotation combined process, but has the following problems: firstly, the ash slag has high hardness, sharp edges and corners and large feeding pressure of 0.15MPa and 0.2MPa respectively, so that conveying equipment and sorting equipment are greatly abraded and the energy consumption is high; secondly, the soft carbon powder is crushed again to reduce the recovery rate of the carbon powder. In addition, the gasified coarse slag has a porous structure and strong adsorbability to medicaments, and if medicaments are used in the process of recovering carbon powder and the like, the problems of large medicament consumption, high cost and the like exist if flotation and the like are adopted, the separation effect is poor, and the economic recycling of the gasified slag and the carbon residue cannot be realized.
The machine-made sand refers to rock particles with the particle size of less than 4.75mm after being mechanically crushed, and is mainly divided into granite-made sand, cobblestone-made sand, limestone-made sand, construction waste-made sand and the like. No documents were retrieved in the prior art for making sand using a gasified coarse slag preparation machine.
Disclosure of Invention
The invention provides a method for preparing sand by a tail slag preparation machine after gasification coarse slag carbon residue recovery and carbon extraction, the ignition loss of recovered carbon fine powder is high, the ignition loss of refined carbon powder is more than 80%, the comprehensive recovery rate of refined carbon powder and secondary carbon powder is more than 85%, the recovery of carbon powder is improved, and the impurity content of a sandy product is reduced.
The technical scheme of the invention is realized as follows: a method for preparing sand by a tail slag preparation machine after gasification coarse slag carbon residue recovery and carbon extraction comprises the following steps:
(1) stirring and mixing the gasified coarse slag and water to obtain gasified slag slurry with the concentration of 45-50%, screening the gasified slag slurry by No. 1 to obtain No. 1 oversize coarse-grained slag and No. 1 undersize fine-grained slag slurry, screening the No. 1 oversize coarse-grained slag by No. 1 shaping-No. 3 to obtain No. 3 oversize slag and No. 3 undersize slag, and dewatering the No. 3 oversize slag to obtain a product 4 coarse sand;
(2) carrying out multi-stage gravity separation on the fine grain slag slurry under the sieve No. 1 to obtain gravity separated light minerals and gravity separated heavy minerals, carrying out 2# screening on the gravity separated light minerals to obtain 2# oversize minerals and 2# undersize minerals, and dewatering and drying the 2# oversize minerals to obtain the product 1 fine carbon powder;
(3) heavy mineral gravity separation is subjected to 2# shaping-4 # screening operation to obtain 4# oversize products and 4# undersize products, the 4# oversize products are dehydrated to obtain 3# fine sand, the 4# undersize products and 3# undersize slag are combined and then subjected to gravity separation operation to obtain gravity separation light materials and gravity separation heavy materials, and the gravity separation heavy materials are subjected to concentration and dehydration to obtain 5 # comprehensive tailings;
(4) and combining the gravity concentration light materials with the No. 2 undersize minerals, and concentrating and dehydrating to obtain the product 2 secondary carbon powder.
Further, in the step (2), the multi-stage gravity concentration operation comprises first-stage gravity roughing, first-stage gravity concentration and second-stage gravity concentration, undersize fine grain slag slurry is subjected to first-stage gravity roughing to obtain first-stage light minerals and first-stage heavy minerals, the first-stage light minerals enter first-stage gravity concentration to obtain gravity light minerals, first-stage fine selected minerals and first-stage fine concentrated heavy minerals, the first-stage concentration middlings enter second-stage gravity concentration to obtain second-stage fine selected light minerals and second-stage fine selected heavy minerals, the second-stage fine selected light minerals and the oversize minerals are combined and dehydrated and dried to obtain product 1 fine carbon powder, and the first-stage heavy minerals, the first-stage fine selected heavy minerals and the second-stage fine selected heavy minerals are combined into gravity heavy minerals.
And (3) further, combining the water and the gravity concentration scavenged light material removed from the No. 2 oversize mineral in the step (2) with the No. 2 undersize mineral, and concentrating and dehydrating to obtain the product 2 secondary carbon powder.
And further, combining the water removed from the 3# oversize in the step (1), the overflow water concentrated in the step (4) and the water removed from the 4# oversize product in the step (3) with gravity concentration scavenging heavy materials, concentrating to obtain return water and concentrated slag slurry, and dehydrating the concentrated slag slurry to obtain the product 5 comprehensive tailings.
Further, the gasified coarse slag is conveyed from the slag settling tank of the gasification furnace to a stirring barrel through a slag dragging machine, and is stirred and mixed with water in the stirring barrel.
Further, the gravity separation operation in the step (2) and the step (3) can 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.
The invention has the beneficial effects that:
(1) the method has the advantages that the ignition loss of the recovered carbon fine powder is high, the recovery rate is high, the ignition loss of the refined carbon powder is more than 80%, the comprehensive recovery rate of the refined carbon powder and the secondary carbon powder is more than 85%, and the recovered carbon powder can be used for cyclic gasification, thermoelectric co-combustion or preparation of an active carbon adsorption material; the residual slag after carbon extraction is mainly an aluminum-silicon-based glass melt, and the fine sand of a product 3 and the coarse sand of a product 4 are obtained respectively through shaping and upgrading, and indexes such as the mud content, the stone dust content, the light mineral content and the crushing value of the products meet the quality requirements of JGJ 52-2006-Standard of the quality of sand and stone for common concrete and inspection method;
(2) the gasified coarse slag does not need to be dehydrated, drained and transferred to and out of a slag yard for disposal, the process is directly adopted for carbon powder recovery and sand making, the solid waste weight reduction is more than 50 percent, the volume reduction is more than 75 percent, the solid waste disposal cost is low, and the comprehensive benefit is good;
(3) heavy minerals are reselected, and the quality is improved through shaping, attachments on the surfaces of the sandy mineral particles are stripped, carbon powder particles are not completely separated through grinding, the content of light substances is reduced, the sphericity and compression resistance indexes of the sandy mineral particles are improved, the sphericity of the sandy mineral particles can also be improved through shaping coarse-grained slag on a No. 1 sieve, the edge angle and sharpness of ash slag are reduced, and the abrasion to equipment and the energy consumption for conveying are reduced; through screening and grading, the contents of carbon powder, light substances and stone powder in coarse sand and fine sand products are screened out, so that the recovery rate of the carbon powder products is further improved, and the impurity content of the sandy products is reduced.
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.
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, the method for preparing sand by the tail slag preparation machine after the recovery and carbon extraction of the gasified coarse slag and the carbon residue comprises the following steps:
(1) stirring and mixing the gasified coarse slag and water to obtain gasified slag slurry with the concentration of 45-50%, screening the gasified slag slurry by a No. 1 sieve to obtain No. 1 oversize coarse-grained slag and No. 1 undersize fine-grained slag slurry, screening the No. 1 oversize coarse-grained slag by a No. 1 shaping machine-No. 3 to obtain No. 3 oversize slag and No. 3 undersize slag, dewatering the No. 3 oversize slag to obtain a product 4 coarse sand, wherein the aperture of a sieve hole of the No. 1 sieve is 0.6-1.8 mm;
(2) subjecting the fine grain slurry under the sieve No. 1 to multi-stage gravity separation operation to obtain gravity separated light minerals and gravity separated heavy minerals, subjecting the gravity separated light minerals to 2# screening operation to obtain oversize minerals No. 2 and undersize minerals No. 2, subjecting the multi-stage gravity separation operation to first stage gravity separation roughing, first stage gravity separation and second stage gravity separation and concentration, subjecting the fine grain slurry under the sieve to first stage gravity separation and roughing to obtain first stage light minerals and first stage heavy minerals, subjecting the first stage light minerals to first stage gravity separation and concentration to obtain gravity separated light minerals, first stage gravity separation and concentration heavy minerals, subjecting the gravity separated light minerals and the gravity separated heavy minerals to second stage gravity separation and concentration, subjecting the gravity separated light minerals and the gravity separated heavy minerals to dehydration drying to obtain refined carbon powder of product No. 1, and combining the gravity separated heavy minerals, the gravity separated heavy minerals and the gravity separated heavy minerals to first stage gravity separation and concentration, The operation concentration of the first stage reselection concentration and the second stage reselection concentration is 35-40%;
(3) heavy mineral gravity is subjected to 2# shaping-4 # screening operation to obtain 4# oversize products and 4# undersize products, 4# oversize products are dehydrated to obtain 3# fine sand, a vertical shaping machine is adopted, the concentration of the shaping operation is 55-60%, the pore size range of 4# screening is 0.35-0.7mm, 4# undersize products and 3# undersize slag in the step (1) are combined and then subjected to gravity concentration and scavenging operation to obtain scavenged light materials and scavenged heavy materials, water removed from 3# oversize products in the step (1), overflow water concentrated in the step (4), water removed from 4# oversize products in the step (3) and scavenged heavy materials are combined and then concentrated to obtain backwater and concentrated slag slurry, and the concentrated slag slurry is dehydrated to obtain 5 # comprehensive tailings;
(4) and (3) combining the water removed from the No. 2 oversize mineral in the step (2), the scavenged light material in the step (3) and the No. 2 undersize mineral in the step (2), and concentrating and dehydrating to obtain the product 2 secondary carbon powder.
In the step (1), the gasified coarse slag is conveyed to a stirring barrel from a slag settling tank of the gasification furnace through a slag dragging machine, and is stirred and mixed with water in the stirring barrel.
Wherein, the gravity separation operation in the step (2) and the step (3) can 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.
The specific embodiment of the invention:
example 1
The method is characterized in that the method is used for recycling carbon powder and carrying out sand making and large-scale separation by a carbon extraction tailing preparation machine aiming at gasified slag of an inner-covering coal chemical industry enterprise, wherein the loss on ignition of a raw material of the gasified coarse slag is 17.52 percent, and the water content is 29.76 percent.
The method for preparing the sand by the gasified coarse slag carbon residue recovery and carbon extraction tailing preparation machine comprises the following steps:
(1) stirring and mixing the gasified coarse slag and water to obtain gasified slag slurry with the concentration of 45%, screening the gasified slag slurry by a No. 1 sieve to obtain No. 1 oversize coarse-grained slag and No. 1 undersize fine-grained slag slurry, screening the No. 1 oversize coarse-grained slag by a No. 1 shaping machine-No. 3 to obtain No. 3 oversize slag and No. 3 undersize slag, dewatering the No. 3 oversize slag to obtain a product 4 coarse sand, wherein the aperture of a sieve hole of the No. 1 sieve is 0.8 mm;
(2) the method comprises the following steps that 1# undersize fine grain slag slurry is subjected to multi-stage reselection operation to obtain reselected light minerals and reselected heavy minerals, the reselected light minerals are subjected to 2# screening operation to obtain 2# oversize minerals and 2# undersize minerals, the multi-stage reselection operation comprises first-stage reselection roughing, first-stage reselection fine selection and second-stage reselection fine selection, the second-stage reselection light minerals and the 2# oversize minerals are combined and are dehydrated and dried to obtain product 1 refined carbon powder, the first-stage heavy minerals, the first-stage reselection heavy minerals and the second-stage reselection heavy minerals are combined to form reselected heavy minerals, and the concentration of the operation of the first-stage reselection roughing, the first-stage reselection fine selection and the second-stage reselection fine selection is 35%;
(3) heavy mineral gravity is subjected to 2# shaping-4 # screening operation to obtain 4# oversize products and 4# undersize products, 4# oversize products are dehydrated to obtain 3# fine sand, a vertical shaping machine is adopted, the concentration of the shaping operation is 55%, the pore size range of 4# screening is 0.7mm, the 4# undersize products are combined with 3# undersize slag in the step (1) and then subjected to gravity concentration scavenging operation to obtain scavenged light materials and scavenged heavy materials, water removed from the 3# oversize products in the step (1), overflow water removed from the 4# oversize products in the step (4) and water removed from the 4# oversize products in the step (3) are combined with the scavenged heavy materials and then concentrated to obtain backwater and concentrated slag slurry, and the concentrated slag slurry is dehydrated to obtain 5 # comprehensive tailings;
(4) and (3) combining the water removed from the No. 2 oversize mineral in the step (2), the scavenged light material in the step (3) and the No. 2 undersize mineral in the step (2), and concentrating and dehydrating to obtain the product 2 secondary carbon powder.
In the step (1), the gasified coarse slag is conveyed to a stirring barrel from a slag settling tank of the gasification furnace through a slag dragging machine, and is stirred and mixed with water in the stirring barrel.
And (3) adopting a check spiral chute for reselection operation in the steps (2) and (3).
In this example, 1 carbon fine powder, which has a loss on ignition of 80.43% and a carbon recovery of 60.60%, and 2 secondary carbon powder, which has a loss on ignition of 54.12% and a carbon recovery of 26.20%, were obtained, respectively, and the cumulative carbon recovery of the fine carbon powder and the secondary carbon powder was 86.80%. In addition, the product 4 coarse sand with the yield of 47.70 percent and the loss on ignition of 0.92 percent and the product 3 fine sand with the particle size of-4.75 to +0.8mm and the product with the yield of 20.24 percent and the loss on ignition of 0.87 percent and the particle size of-0.8 to +0.1mm are also obtained. The loss on ignition of the comprehensive tailings of the product 5 is 16.37 percent, the yield is 10.38 percent, and the main components are flocculent amorphous glass melt and micro-fine carbon powder, and the water content is 35.32 percent after the dehydration by a plate-and-frame filter press. The product 1 carbon fine powder can be used for secondary blending combustion, blast furnace injection, preparation of activated carbon adsorbent and the like. The secondary carbon powder of the product 2 is dehydrated and the water content is controlled to be less than 25 percent, so the secondary mixed combustion can be used. The coarse sand of the product 4 and the fine sand of the product 3 can be used in road engineering and building engineering by mixing with part of the machine-made sand.
The quality and inspection method standard of sand and stone for common concrete JGJ52-2006 is adopted to inspect and detect the fine sand of the product 3 and the coarse sand of the product 4, and the apparent density (kg/m)3) Not less than 2500, bulk density (kg/m)3) More than or equal to 1400, the content (%) of sulfide is 0.05 (mass standard is less than or equal to 1.0), the voidage (%) is less than or equal to 44, the content (%) of light substances is less than or equal to 1.0, and the total crushing value<30 percent and meets the standard requirement of 'building sand' GB/T14684-2011。
Example 2
The present example is substantially the same as example 1, except that in step (1), the gasified coarse slag and water are stirred and mixed to obtain a gasified slag slurry with a concentration of 50%, and the mesh diameter of the No. 1 sieve is 1.8 mm;
in the step (2), the operation concentration of the first-stage reselection roughing, the first-stage reselection refining and the second-stage reselection refining is 40 percent;
(3) heavy minerals are reselected and subjected to 2# shaping-4 # screening operation to obtain 4# oversize products and 4# undersize products, the 4# oversize products are dehydrated to obtain 3# fine sand, a vertical shaping machine is adopted, the concentration of the shaping operation is 60%, and the aperture range of 4# screening is 0.35 mm.
Example 3
The present example is substantially the same as example 1, except that in step (1), the gasified coarse slag and water are stirred and mixed to obtain gasified slag slurry with a concentration of 48%, and the mesh diameter of the No. 1 sieve is 0.6 mm;
in the step (2), the operation concentration of the first stage reselection roughing, the first stage reselection refining and the second stage reselection refining is 38 percent;
(3) heavy minerals are reselected and subjected to 2# shaping-4 # screening operation to obtain 4# oversize products and 4# undersize products, the 4# oversize products are dehydrated to obtain 3# fine sand, a vertical shaping machine is adopted, the concentration of the shaping operation is 57%, and the aperture range of 4# screening is 0.6 mm.
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 (6)
1. The method for preparing the sand by the aid of the machine for preparing the tailings after gasification, coarse slag and carbon residue recovery and carbon extraction is characterized by comprising the following steps of:
(1) stirring and mixing the gasified coarse slag and water to obtain gasified slag slurry with the concentration of 45-50%, screening the gasified slag slurry by No. 1 to obtain No. 1 oversize coarse-grained slag and No. 1 undersize fine-grained slag slurry, screening the No. 1 oversize coarse-grained slag by No. 1 shaping-No. 3 to obtain No. 3 oversize slag and No. 3 undersize slag, and dewatering the No. 3 oversize slag to obtain a product 4 coarse sand;
(2) carrying out multi-stage gravity separation on the fine grain slag slurry under the sieve No. 1 to obtain gravity separated light minerals and gravity separated heavy minerals, carrying out 2# screening on the gravity separated light minerals to obtain 2# oversize minerals and 2# undersize minerals, and dewatering and drying the 2# oversize minerals to obtain the product 1 fine carbon powder;
(3) heavy mineral gravity separation is subjected to 2# shaping-4 # screening operation to obtain 4# oversize products and 4# undersize products, the 4# oversize products are dehydrated to obtain 3# fine sand, the 4# undersize products and 3# undersize slag are combined and then subjected to gravity separation operation to obtain gravity separation light materials and gravity separation heavy materials, and the gravity separation heavy materials are subjected to concentration and dehydration to obtain 5 # comprehensive tailings;
(4) and combining the gravity concentration light materials with the No. 2 undersize minerals, and concentrating and dehydrating to obtain the product 2 secondary carbon powder.
2. The method for producing sand by using the machine for preparing tailings after carbon extraction and recovery of gasified coarse slag and residual carbon is characterized in that in the step (2), the multi-stage gravity separation operation comprises one-stage gravity separation roughing, one-stage gravity separation concentration and two-stage gravity separation concentration, the fine slag slurry under the 1# screen is subjected to one-stage gravity separation roughing to obtain one-stage light minerals and one-stage heavy minerals, the one-stage light minerals are subjected to one-stage gravity separation concentration to obtain gravity separated light minerals, one-stage refined minerals and one-stage refined heavy minerals, the minerals in the one-stage gravity separation concentration are subjected to two-stage gravity separation concentration to obtain two-stage gravity separated light minerals and two-stage gravity separated heavy minerals, the two-stage gravity separated light minerals and the 2# screen minerals are combined and dehydrated and dried to obtain the product 1 refined carbon powder, and the one-stage gravity separation heavy minerals, the one-stage gravity separation heavy minerals and the two-stage gravity separated heavy minerals are combined into the heavy minerals.
3. The method for preparing sand by the tailing preparation machine after carbon extraction of the gasified coarse slag and carbon residue is characterized in that water removed from the No. 2 oversize mineral in the step (2), the gravity concentration light material and the No. 2 undersize mineral are combined and concentrated and dehydrated to obtain the product 2 secondary carbon powder.
4. The method for preparing the sand by the tailing preparation machine after the recovery and the carbon extraction of the gasified coarse slag and the carbon residue according to the claim 1 or 2, characterized in that the water removed from the 3# oversize in the step (1), the overflow water concentrated in the step (4) and the water removed from the 4# oversize product in the step (3) are combined with heavy gravity materials and then concentrated to obtain return water and concentrated slag slurry, and the concentrated slag slurry is dehydrated to obtain 5 comprehensive tailings.
5. The method for producing sand by the machine for the preparation of tailings after carbon extraction from the gasified coarse slag according to claim 1, wherein the gasified coarse slag is conveyed from the slag settling tank of the gasification furnace to the stirring barrel by the slag remover and is stirred and mixed with water in the stirring barrel.
6. The method for producing the sand by the gasified coarse slag carbon residue recovery-tailing after carbon extraction preparation machine according to the claim 1 or 2, characterized in that the gravity separation operation in the step (2) and the step (3) can 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.
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| CN113751192B (en) | 2023-04-11 |
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