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CN-224230639-U - Sectional baking integrated shaft furnace for high-humidity nonmetallic tailing pellets

CN224230639UCN 224230639 UCN224230639 UCN 224230639UCN-224230639-U

Abstract

The application discloses a sectional baking integrated shaft furnace for high-humidity nonmetallic tailing pellets, and particularly can solve the problems of easiness in bursting of high-humidity pellets, unstable quality of finished pellets, low grade, high production energy consumption and low production efficiency of the tailing pellets by adopting a traditional production method. The application is particularly suitable for drying, roasting and cooling high-humidity nonmetallic tailing pellets and producing metallurgical pellets and small-particle lime, achieves the purpose of 'one furnace for multiple purposes', adopts a mode of 'drying, roasting, heat exchange and cooling' and 'three-in-one', realizes three-section integrated production, greatly reduces equipment investment, occupied area and comprehensive energy consumption, has simple structure, high production efficiency and high yield and good economy, and has important significance in the aspects of recycling and applying various powdery and mud tailings, improving the production process level of the whole tailing pellets, reducing production cost, greatly improving product grade and quality, reducing pollution and reducing carbon, improving ecological environment and the like.

Inventors

  • LIU YUQUAN
  • LIU JIUSHENG

Assignees

  • 唐山金泉冶化科技产业有限公司

Dates

Publication Date
20260512
Application Date
20250428

Claims (9)

  1. 1. The sectional baking integrated shaft furnace for the high-humidity nonmetallic tailing pellets is characterized by comprising a vertical furnace body, wherein the vertical furnace body is of an upper-middle-lower three-section structure, the upper section is a baking section, the middle section is a baking section, and the lower section is a heat exchange cooling section; The inlet end of the drying section is connected with a feeding conveyor through a high-low double-rail reciprocating shuttle type material distribution vehicle, a multistage vibration discharging type drying bed device is arranged below a discharging point of the drying section corresponding to the high-low double-rail reciprocating shuttle type material distribution vehicle, and a powder collecting bin I is arranged at the lower part of the vibration discharging type drying bed device; An intermediate baffle is arranged between the roasting section and the drying section, an in-furnace circulating air channel communicated with the first powder collecting bin is longitudinally arranged at the inner center position of the roasting section, two roasting areas are formed at the two sides of the in-furnace circulating air channel, a connecting rod type double-layer air locking seal valve device for connecting the roasting section and the drying section is arranged at the upper part of each roasting area, a drying primary air outlet is arranged at the upper part of the in-furnace circulating air channel and used for supplying heat and air to the vibrating blanking type drying bed device, two combustion chambers are symmetrically arranged at the two sides of the roasting section furnace body, an out-furnace circulating air channel is arranged at the bottom of the in-furnace circulating air channel, and the out-furnace circulating air channel is connected with the second powder collecting bin; The energy-saving furnace is characterized in that a tooth-shaped crushing discharger is arranged between the heat exchange cooling section and the roasting section, a vibration ash discharger is arranged at the bottom of the heat exchange cooling section, a cooling air inlet and a hot air rising pipeline I and a hot air rising pipeline II are connected to the heat exchange cooling section, the hot air rising pipeline I is communicated with the combustion chamber, and the hot air rising pipeline II is communicated with a circulating air channel outside the furnace.
  2. 2. The sectional baking integrated shaft furnace for the high-humidity nonmetallic tailing pellets, according to claim 1, is characterized in that the heat exchange cooling section adopts a three-stage solid-solid heat exchanger which is divided into a high-temperature solid-solid heat exchange device, a medium-temperature solid-solid heat exchange device and a low-temperature solid-solid heat exchange device which are arranged from top to bottom, the outlet of the tooth-shaped crushing discharger is connected with the high-temperature solid-solid heat exchange device, the high-temperature solid-solid heat exchange device is provided with a combustion air inlet and a hot air outlet, a plurality of groups of external circulating pipelines I are arranged outside the high-temperature solid-solid heat exchange device, the external circulating pipelines I are connected with the combustion chamber through the hot air rising pipeline I, the hot air outlet II is connected with a hot air rising pipeline II, and the hot air rising pipeline II is also connected with a secondary mixing pipeline; The low-temperature solid-solid heat exchange device is provided with a cooling air inlet and a first hot air outlet, the first hot air outlet is communicated with the medium-temperature solid-solid heat exchange device through an external circulation pipeline II, the cooling air inlet is connected with a cooling fan, and the vibration ash discharging machine is positioned at the bottom of the low-temperature solid-solid heat exchange device.
  3. 3. The sectional baking integrated shaft furnace for high-humidity nonmetallic tailing pellets according to claim 1, characterized in that the connecting rod type double-layer air locking sealing valve device comprises an upper valve body positioned at the upper part and a lower valve body positioned at the lower part, and the upper valve body and the lower valve body are connected with a hydraulic cylinder through a connecting rod; the air-locking assembly comprises a multi-point blanking control valve and is correspondingly arranged on the upper valve body and the lower valve body respectively.
  4. 4. The sectional baking integrated shaft furnace for high-humidity nonmetallic tailing pellets, according to claim 1, wherein the baking section is composed of a sealed gas collecting box body made of a steel structure, a steam conversion device is arranged outside the sealed gas collecting box body, a steam collecting device connected with the steam conversion device is arranged inside the sealed gas collecting box body, the steam conversion device is connected with a condensate drum through a steam drum, a steam outlet is arranged at the upper part of the steam drum, and a condensate descending opening is arranged at the bottom of the condensate drum.
  5. 5. The sectional baking integrated shaft furnace for the high-humidity nonmetallic tailing pellets, according to claim 4, wherein a baking section dust collection main pipe is arranged at the top of the sealed gas collection box body, an inclined gas outlet is arranged at the top of the baking section furnace body, the inclined gas outlet is connected with a high-temperature waste gas waste heat exchange device, a high-temperature waste gas inlet, a cold air adjusting inlet and a high-temperature air outlet are arranged on the high-temperature waste gas waste heat exchange device, the high-temperature air outlet is connected with a baking secondary air pipeline, and the high-temperature waste gas waste heat exchange device is further connected with a flue gas dust collection system through a heat exchange rear waste gas outlet main pipe.
  6. 6. The sectional baking integrated shaft furnace for high-humidity nonmetallic tailing pellets according to claim 1, characterized in that an anti-over-humidity device is provided at the upper part of the vibrating blanking type drying bed device; The vibrating blanking type drying bed device is arranged in a multistage vertical mode, each stage of structure adopts a positive umbrella-shaped mode and an inverted umbrella-shaped mode, the positive umbrella-shaped bed body is used for receiving materials outside the outer wall of the bed surface, the inverted umbrella-shaped bed body is used for receiving materials inside the inner wall of the bed surface, and the bed surface adopts a transverse shutter structure.
  7. 7. The sectional baking integrated shaft furnace for the high-humidity nonmetallic tailing pellets, as claimed in claim 1, is characterized in that the baking section furnace body adopts a T-shaped vertical closed structure, the cross section is of a symmetrical double-chamber rectangular structure, and a secondary combustion air pipeline is arranged at the bottom of the baking section furnace body below the combustion chamber; The two combustion chambers are respectively provided with at least two gas fuel burners and at least one solid fuel burner on the end surfaces, wherein the gas fuel burners are connected with a first combustion-supporting air pipeline and the solid fuel burners are connected with a solid fuel conveying pipeline; the powder collecting bin is connected with the powder collecting tank through a powder descending pipeline.
  8. 8. The sectional baking integrated shaft furnace for high-humidity nonmetallic tailing pellets according to claim 1, wherein the vibration ash discharger is provided with a plurality of independent discharging units which are symmetrical in parallel, and the high-temperature solid-solid heat exchange device, the medium-temperature solid-solid heat exchange device and the low-temperature solid-solid heat exchange device corresponding to the vibration ash discharger are also provided with a plurality of groups.
  9. 9. The sectional baking integrated shaft furnace for high-humidity nonmetallic tailing pellets, according to claim 1, characterized in that the high-low double-rail reciprocating shuttle type material distributing vehicle comprises a material distributing vehicle body, an external vehicle body traveling guide rail and an internal guide rail, wherein the external vehicle body traveling guide rail is used for providing support and guide for the movement of the material distributing vehicle body, the external vehicle body traveling guide rail is combined with the internal guide rail, a material distributing device is arranged at the front end of the material distributing vehicle body, a guiding traveling wheel is arranged at the head of the material distributing device, and a material discharging opening is arranged at the head of the material distributing device.

Description

Sectional baking integrated shaft furnace for high-humidity nonmetallic tailing pellets Technical Field The application relates to the technical field of nonmetallic material and tailing pellet production, in particular to a shaft furnace and a process for producing, drying and roasting high-moisture tailing pellets such as phosphorite and the like, metallurgical pellets and small-particle lime. Background At present, the nonmetallic mine industry in China is brought to an important period of high-speed and high-quality development under the guidance of national policies. The functional mineral materials are valued, mineral resources are comprehensively, efficiently and highly valued to be utilized, the mineral resources are permeated into various regions and various ores, and graphite, fluorite, bentonite, kaolin, wollastonite phosphorite, gypsum, various associated ores, tailings and the like are paid attention to the market. The national release of the industrial structure adjustment instruction catalogue encourages comprehensive utilization technology of medium and low grade ores, mineral dressing tailings and associated resources of building materials, phosphogypsum, phosphorite and fluorite ores. The national industrial resource comprehensive utilization advanced applicable process technology equipment catalogue recommends 4 kinds of advanced applicable process technology equipment such as industrial solid waste reduction, industrial solid waste comprehensive utilization, renewable resource recycling, remanufacturing and the like. The method is mainly used for the aspects of flotation recovery of fine particles, comprehensive utilization of solid wastes such as tailings, fly ash, red mud, sludge, gasified slag, smelting slag dust and the like, comprehensive utilization of industrial byproduct gypsum, comprehensive utilization of byproduct gypsum, harmless treatment of phosphogypsum and the like. In general, the comprehensive, efficient and high-value utilization of resources is a unified development main melody of nonmetallic mine industry, especially the utilization of solid wastes such as tailings formed in the industry, and the accumulated accumulation of large solid wastes in China is about 600 hundred million t at present, and the newly increased accumulation of solid wastes in China is about 30 hundred million t. The method is characterized in that ① China is used as a global phosphorite resource production and consumption state, a large amount of phosphate tailings (containing waste after phosphorite dressing) are generated in the phosphorite exploitation and processing process, and 0.44t of phosphate tailings are generated every 1t of phosphate concentrate is produced. At present, the number of the phosphate tailings existing in the tailings pond is huge, and by the end of 2021, more than 1 million t of phosphate tailings are accumulated in China, and meanwhile, about 700 ten thousand t of phosphate tailings are also produced each year. ② Currently, the global phosphogypsum stockpiling amount reaches 60 million t, and the annual speed is still increasing at 1.5 million t. The Chinese is the first world of large phosphorus fertilizer production country and the first large phosphogypsum byproduct country, the phosphogypsum stock has reached 4 million t, and the phosphogypsum stock is still increased at a speed of about 5000 ten thousand t each year. Importantly, the tailings contain a large amount of usable raw ore powder, which is equivalent to the middle-low grade ore. Currently, the reserves of high-grade ores are being drastically reduced due to disordered mining and serious waste of ores, and if the tailings are directly discharged as solid wastes, the treatment cost and the environmental-friendly treatment cost are increased, and great resource waste is caused. If the tailing powder is recycled, the tailing powder is fine and mud, and the like, and cannot be directly fed into a smelting furnace for application. In particular, the tailings produced by the flotation method are usually in the form of ore pulp, if the ore pulp is directly discharged, water and soil are polluted, generally, a tailings pond is built for collecting the tailings pulp by a production enterprise, and then partial water in the tailings pulp is removed by a dewatering dry discharge process (such as filter pressing and the like) to form tailing mud powder and mud cakes with the water content of about 35 percent for discharge, but the discharged tailings are still required to occupy a large amount of land, secondary environmental pollution, water and soil loss, vegetation destruction and the like are caused, and meanwhile, when the storage quantity is too large, the flow, the collapse, the landslide and the serious potential safety hazard are also extremely easy to cause. Therefore, the preparation of the mud cake obtained by adopting the fine particle tailing powder, the tailing slurry and the filter pressing to obtain