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CN-121990777-A - Production line and method for preparing construction sand by utilizing gas slag

CN121990777ACN 121990777 ACN121990777 ACN 121990777ACN-121990777-A

Abstract

The invention discloses a production line and a method for preparing construction sand by utilizing gas slag, and belongs to the technical field of solid waste resource utilization. The production line comprises a feeding screening device, a coarse grain slag treatment line, a fine grain slag treatment line, a mixing bin, a rolling shaping device, a drying homogenization device and a waste heat recovery device which are connected in sequence. The method comprises the steps of screening coal gasification slag into coarse grain slag and fine grain slag, carrying out infiltration strengthening and leaching treatment on the coarse grain slag, carrying out granulation forming on the fine grain slag, carrying out self-adaptive rolling, crushing and shaping after mixing the coarse grain slag and the fine grain slag, carrying out drying homogenization, and recovering drying waste heat for preheating mixed materials, thereby finally obtaining qualified construction sand. The invention effectively solves the performance defects of unreasonable grading, low density and high crushing index of the gas slag through grading modification and full-flow continuous treatment, can reach the standard without compounding natural sand, and greatly improves the recycling rate of the gas slag.

Inventors

  • FU BO
  • CHEN YUANYE
  • QU ZHENGYANG
  • SU MENG
  • DING NAN
  • CHEN MEIQING
  • LEI HUA
  • Cheng Zhenbin

Assignees

  • 北方民族大学

Dates

Publication Date
20260508
Application Date
20251226

Claims (10)

  1. 1. A production line for preparing construction sand by using gas slag, comprising: A feeding and screening device (100) for screening the gas slag into coarse slag and fine slag by using screening holes (1011); The coarse grain slag treatment line is used for carrying out infiltration strengthening and leaching liquid treatment on the coarse grain slag and comprises an infiltration strengthening device (200), a leaching liquid device (300) and a residual liquid collecting box (400) which are sequentially connected, wherein the residual liquid collecting box is arranged below the leaching liquid device (300); the fine slag treatment line is used for granulating the fine slag to form fine slag particles and comprises a fine slag hopper (600) for receiving the fine slag, a disc granulation device (700) and a conveying device (800) connected with a discharge port of the disc granulation device (700); The feed inlet of the mixing bin (900) is respectively connected with the discharge outlet of the leaching device (300) and the discharge outlet of the conveying device (800) and is used for mixing the treated coarse grain slag with the granulated fine grain slag particles; The rolling shaping device (1000) is provided with a feed inlet below a discharge outlet of the mixing bin (900) and is used for carrying out self-adaptive crushing shaping on the mixed materials; The feeding port of the drying and homogenizing device (1100) is arranged below the discharging port of the rolling and shaping device (1000) and is used for drying and homogenizing the crushed and shaped sand; And one end of a hot air pipeline (1201) of the waste heat recovery device (1200) is connected with a hot air outlet (1106) of the drying and homogenizing device (1100), and the other end of the hot air pipeline is connected with a machine body of the rolling and shaping device (1000) to form a closed loop heat utilization system for preheating crushed materials by using the drying waste heat.
  2. 2. The production line for preparing construction sand by utilizing gas slag according to claim 1, wherein the feeding screening device (100) comprises a first cylinder body (101) which is obliquely arranged, screening holes (1011) with the aperture of 2 mm-5 mm are uniformly formed in the bottom surface of the first cylinder body (101), a first stirring shaft (104) driven by a first driving motor (102) through a chain (103) is arranged in the first cylinder body, stirring fan blades (105) which are in clearance fit with the inner wall of the first cylinder body (101) are fixedly arranged on the first stirring shaft (104), a coarse grain slag transfer bin (106) is arranged at the outlet of the lower part of the first cylinder body (101), and a first flow control valve (107) is arranged at the discharge port of the coarse grain slag transfer bin (106); the fine slag hopper (600) is arranged below the screening hole (1011) and the interface size thereof covers the projection area of the section of the screening hole (1011).
  3. 3. The production line for preparing construction sand by utilizing gas slag according to claim 1, wherein the infiltration strengthening device (200) comprises a second cylinder (201) which is obliquely arranged, a first auger (203) driven by a second driving motor (202) is arranged in the second cylinder, and a liquid inlet pipe (204) for injecting strengthening liquid into the second cylinder (201) is arranged at the upper part of the second cylinder; The leaching device (300) comprises a third cylinder (301) which is obliquely arranged, leaching holes (3011) are formed in the bottom surface of the third cylinder, a second auger (302) is arranged in the third cylinder, and the second auger (302) is driven by power supplied by a third driving motor (303) and is used for conveying and extruding leaching liquid from coarse grain slag infiltrated by the infiltration strengthening device (200).
  4. 4. A production line for producing construction sand from gas-slag according to claim 3, characterized in that the coarse-slag treatment line further comprises a liquid-supplementing device (500), the liquid-supplementing device (500) comprising a main pipe (501), the main pipe (501) comprising two parallel inlets and one outlet; The first access port of the main pipeline (501) is connected to the reinforced liquid barrel (506) through a liquid supplementing pipe (502) provided with a first one-way valve (504) and a first one-way pump (505), the second access port is connected to a liquid draining pipeline (401) of the residual liquid collecting box (400) through a residual liquid pipe (503) provided with a second one-way valve (507), and the output port of the main pipeline (501) is communicated with a liquid inlet pipe (204) of the infiltration reinforcing device (200).
  5. 5. The production line for producing construction sand using gas slag as claimed in claim 1, wherein the disc granulation device (700) comprises: The granulating disc (701) is obliquely arranged and consists of a disc (7011) and a protective frame (7012) arranged on the outer edge of the disc (7011), the disc (7011) is driven to rotate through a fourth driving motor (702) arranged on the back of the disc (7011), fine slag falling onto the disc (7011) is rolled and gathered towards the protective frame (7012) under the action of centrifugal force, and a shell of the fourth driving motor (702) is hinged with a frame through a hinge rod (703) for adjusting the inclination angle of the granulating disc (701); The spraying assembly (704) comprises a spraying liquid storage barrel (7041), a liquid conveying pipe (7042) and a plurality of spraying heads (7043) which are uniformly distributed right above the granulating disc (701), a second one-way pump (7044) is arranged on the liquid conveying pipe (7042) and is used for conveying liquid to each spraying head (7043) and spraying atomized liquid to fine slag in the granulating disc (701), and each spraying head (7043) is provided with a second flow control valve (7045); slide (705), locate granulation dish (701) below, it is articulated with the frame through the hydraulic stem for match the angle of granulation dish (701), slide (705) both sides are equipped with the protection baffle.
  6. 6. The production line for preparing construction sand by utilizing gas slag according to claim 5, wherein the disc granulation device (700) further comprises a scraper mechanism (706), the scraper mechanism (706) comprises a scraper frame (7061) positioned above the granulation disc (701), the scraper frame (7061) is fixedly connected with a fourth driving motor (702) shell through a connecting piece, a scraper (7062) is arranged on the scraper frame (7061), and the scraper (7062) controls the distance between the scraper and the disc (7011) through an adjusting knob (7063).
  7. 7. The production line for preparing construction sand by utilizing gas slag as claimed in claim 1, wherein the rolling shaping device (1000) comprises a first roller assembly (1001) with a fixed position and a second roller assembly (1002) which is parallel and opposite to the first roller assembly (1001) and is matched with the first roller assembly to extrude the mixed material, the second roller assembly (1002) is elastically connected with a machine body, and the elastic pressure can be adaptively adjusted according to the particle size change of the mixed material so as to carry out adaptive crushing shaping on the mixed material.
  8. 8. The production line for preparing construction sand by using gas slag according to claim 7, wherein the first roller assembly (1001) comprises a first roller (10011), roller shafts on two sides of the first roller (10011) are rotatably connected with a first supporting member (10012), the first supporting member (10012) is fixedly arranged on a fixed support (1005), the fixed support (1005) is fixedly arranged on a frame, and the first roller (10011) is provided with driving force by a fifth driving motor (10013) fixedly arranged on the frame; The second roller assembly (1002) comprises a second roller (10021), the roller surfaces of the second roller (10021) and the first roller (10011) are respectively provided with a concave-convex structure meshed with each other, roller shafts on two sides of the second roller (10021) are respectively connected with a second supporting piece (10022) in a rotating mode, the second supporting pieces (10022) are arranged on a preset slideway (10051) in a fixed support (1005) in a sliding mode, a spring (10023) is arranged between the second supporting pieces (10022) and the fixed support (1005), the second roller (10021) is provided with a driving force by a sixth driving motor (10024), the sixth driving motor (10024) is installed on a frame, a sliding groove (10025) is formed in the installation position of the frame corresponding to the sixth driving motor (10024), and the sixth driving motor (10024) moves synchronously with the second supporting pieces (10022).
  9. 9. The production line for preparing construction sand by utilizing gas slag according to claim 1, wherein the drying and homogenizing device (1100) comprises a fourth cylinder (1101) horizontally arranged, a gasification slag feeding port (1107) and a correction raw material feeding port (1108) are arranged on the fourth cylinder (1101), a second stirring shaft (1103) driven by a seventh driving motor (1102) is arranged in the fourth cylinder, fan-shaped stirring blades (1104) extending spirally towards a discharge port are arranged on the second stirring shaft (1103), air inlet holes (11011) are uniformly formed in the bottom surface of the fourth cylinder (1101), a hot air device (1105) arranged at the bottom of the fourth cylinder (1101) feeds hot air into the cylinder through the air inlet holes (11011), a hot air outlet (1106) is formed in the upper portion of the discharge port, and the hot air outlet (1106) is connected with a hot air pipeline (1201) of the waste heat recovery device (1200).
  10. 10. A method for preparing construction sand by using gas slag, characterized in that the production line according to any one of claims 1 to 9 is used, comprising the following steps: Step 1, raw material screening, namely feeding a gas slag raw material into a feeding screening device (100), and screening coarse grain slag and fine grain slag by using screening holes (1011); Step 2, coarse grain slag treatment, namely sequentially carrying out liquid infiltration strengthening on coarse grain slag through an infiltration strengthening device (200), and carrying out leaching through a leaching device (300), wherein leaching liquid is collected in a residual liquid collecting box (400); step 3, treating fine slag, namely conveying the fine slag into a disc granulating device (700) through a fine slag hopper (600) to granulate to form fine slag particles, and conveying the fine slag particles through a conveying device (800); Step 4, mixing, namely mixing coarse grain slag after leaching with granulated fine grain slag particles in a mixing bin (900); step 5, crushing and shaping, namely conveying the mixed material into a rolling and shaping device (1000) for crushing and shaping; step 6, drying and homogenizing, namely, enabling the crushed and shaped sand materials to enter a drying and homogenizing device (1100), mixing with the correction raw materials, and uniformly drying and homogenizing under the actions of hot air drying and mechanical stirring to obtain qualified construction sand; And 7, waste heat recovery, namely extracting hot waste gas generated by the drying and homogenizing device (1100) by the waste heat recovery device (1200), and conveying the hot waste gas to the rolling and shaping device (1000) for preheating materials to complete thermal circulation.

Description

Production line and method for preparing construction sand by utilizing gas slag Technical Field The invention belongs to the technical field of solid waste recycling, and particularly relates to a production line and a method for preparing construction sand by utilizing gas slag. Background The coal gas slag is solid residue discharged from the bottom of the gasifier, which is generated after the coal is partially oxidized with gasifying agents such as steam and air in the gasifier. At present, the treatment mode of the gas slag mainly takes stacking as a main mode, so that a large amount of land resources are occupied, and potential environmental risks exist. Meanwhile, the demand of the building industry for natural sand is continuously increasing, and the excessive exploitation can cause serious ecological environment problems. Therefore, the coal gas slag is converted into the construction sand, so that waste is changed into valuable, and the method has remarkable environmental and economic benefits. In the prior art, when the gasified slag is used as the building sand, most of the gasified slag is directly utilized after simple dehydration treatment, the gasified slag has the performance defects of unreasonable grading, small apparent density, small bulk density, large crushing index and the like, and is difficult to be singly used as the building sand, the gasified slag is usually compounded with natural sand or machine-made sand in practical engineering application, the mass doping ratio of the gasified slag is not more than 50 percent, and the application is limited. Although related modification technology is proposed, the technology stays in laboratory research or intermittent operation stages, and lacks full-flow integrated continuous production equipment which comprises pretreatment, modification and compounding to homogenization of finished products, so that large-scale popularization and application of the gas slag in the field of building sand are severely restricted. Therefore, development of an integrated technology and equipment for preparing construction sand from gasified slag, which can effectively optimize the grading and performance of gasified slag and realize low-energy-consumption continuous production, is needed to better promote the industrialized application of gasified slag sand. In view of this, the present invention has been made. Disclosure of Invention The invention aims to overcome the defects of the prior art, and provides a production line and a method for preparing construction sand by using gas slag, which are mainly used for solving the problems that the sand grade distribution density for the gas slag construction is not up to standard, the crushing index is higher, the mixing amount is limited, the whole-flow continuous production equipment is lacked, and the large-scale popularization is difficult. According to the invention, the coal gas slag is treated according to the particle size classification, the performances of coarse and fine slag are optimized in a targeted manner, and then the coal gas slag is mixed, crushed and shaped in a self-adaptive manner, dried and homogenized, and the closed-loop heat utilization design of waste heat recovery is matched, so that the efficient modification and continuous production of the coal gas slag are realized, the construction sand meeting the standard is produced, the resource utilization rate is improved, and the energy consumption is reduced. The invention aims at solving the problems by the following technical scheme: In one aspect, the invention provides a production line for preparing construction sand by using gas slag, comprising: The feeding screening device is used for screening the gas slag into coarse grain slag and fine grain slag in a feeding step through screening; The coarse grain slag treatment line is used for carrying out infiltration strengthening and leaching liquid treatment on the coarse grain slag and comprises an infiltration strengthening device, a leaching liquid device and a residual liquid collecting box which are sequentially connected, wherein the residual liquid collecting box is arranged below the leaching liquid device; the fine grain slag treatment line is used for granulating the fine grain slag to form coarser particles and comprises a fine grain slag hopper for receiving the fine grain slag, a disc granulation device and a conveying device connected with a discharge port of the disc granulation device; the feed inlet of the mixing bin is respectively connected with the discharge outlet of the liquid leaching device and the discharge outlet of the conveying device, and is used for mixing the treated coarse grain slag with the granulated fine grain slag particles; the roll-in shaping device is provided with a feed inlet below a discharge outlet of the mixing bin and is used for carrying out self-adaptive crushing shaping on the mixed materials; The feeding port of the drying and homogeni