CN111298933B - Multi-stage crushing method for blocky solids - Google Patents
Multi-stage crushing method for blocky solids Download PDFInfo
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- CN111298933B CN111298933B CN201811521271.6A CN201811521271A CN111298933B CN 111298933 B CN111298933 B CN 111298933B CN 201811521271 A CN201811521271 A CN 201811521271A CN 111298933 B CN111298933 B CN 111298933B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
Abstract
The invention relates to a multistage crushing method for blocky solids, which comprises the following steps of: determining the zero to three grade number of the basic pole breaking from the maximum size fraction of the massive solid; and then carrying out final-stage crushing operation: the high-pressure roller mill or a squirrel cage crusher is selected for the tail end crushing operation, and the crushed materials are fed into a second-stage screening operation; and finally grinding: feeding materials in the pneumatic conveying bin into the ore grinding bin, feeding the materials in the ore grinding bin into the mill through the quantitative feeding device, feeding the ground materials into the vibrating screen through the pneumatic conveying device, returning the oversize materials to the mill, circulating the materials in the mill, and returning the undersize materials to the fine powder cost bin. The method is a set of flexible crushing system, not only can crush products with different particle sizes according to the needs of owners, but also can crush products with single narrow grade size fraction, and can crush the product size fraction to be below-2 mm, thereby better realizing more crushing and less grinding, greatly reducing the energy consumption of a grinder and realizing the narrow grade size distribution of mineral powder.
Description
Technical Field
The invention belongs to the technical field of mineral processing, and particularly relates to a multistage crushing method for blocky solids, which is particularly suitable for flammable and explosive powder.
Background
At present, the solid which is generally needed to be crushed mainly comprises metal minerals, non-metal minerals, coal blocks and soluble salt minerals, the crushing process generally adopts two-section one-closed circuit or three-section one-closed circuit crushing, and the crushed material generally has the granularity of-12 mm. In addition, the crushing method in the prior art has poor adaptability, can not crush products with different particle sizes according to the needs of owners, and has high energy consumption of a mill for some materials needing subsequent chemical modification and chemical synthesis, wide particle size distribution obtained by crushing, and poor chemical reaction and modification effects, thus causing high cost and poor quality of final chemical products.
Disclosure of Invention
The invention aims to solve the technical problem of providing a novel multistage crushing method for blocky solids aiming at the defects of the prior art.
The technical problem to be solved by the present invention is achieved by the following technical means. The invention relates to a multistage crushing method for blocky solids, which is characterized by comprising the following steps:
(1) and (3) crushing operation of a foundation pole: determining the grade number of the basic pole crushing from the maximum size fraction of the massive solid, wherein the grade number of the basic pole crushing is zero to three:
when the maximum granularity of the massive solid is 80mm or below, the grade number of the basic extremely-broken solid is zero grade;
when the maximum granularity of the massive solid is 80-150 mm, the number of the stage of the basic extreme crushing is one stage;
when the maximum particle size of the massive solid is 150-500 mm, the foundation is extremely crushed into two stages;
when the maximum crushing particle size of the blocky solid is more than +500mm, the basic pole is crushed into three stages;
during crushing, give the former block storehouse with this cubic solid earlier, the interior material of storehouse gives to the extremely broken operation of basis through bottom of the storehouse dosing equipment, conveying machinery, wherein:
when the grade number of the basic pole crushing is zero grade, directly carrying out the last-stage crushing operation in the step (2) on the materials in the bin;
when the stage number of the basic pole crushing is one stage, a jaw crusher is selected for the first stage crushing, and the crushed material is conveyed to the last stage crushing operation in the step (2);
when the grade number of the basic pole crushing is two-grade or three-grade, a jaw crusher is selected for the first-grade crushing, and the crushed material is conveyed to the second grade; a jaw crusher or a cone crusher is selected for secondary crushing; feeding the material subjected to the secondary crushing to a first-stage screening operation by a conveying machine, wherein a multi-layer screen is adopted as screening equipment, and three coarse, medium and fine particle grades are screened out; feeding coarse fraction materials into a short-head type cone crusher for three-stage crushing and then feeding the coarse fraction materials into the last-stage crushing operation in the step (2), or directly feeding the coarse fraction materials into the last-stage crushing operation in the step (2);
after being transported by a three-way material separator, a vibration conveyor or a rubber belt conveyor, the medium-grade materials in the first-stage screening operation are respectively fed into a loading bin or the final-stage crushing operation in the step (2); fine fraction materials of a section of screening operation are pneumatically conveyed to a pneumatic conveying bin through a bin pump;
(2) and (3) final-stage crushing operation: selecting a high-pressure roller mill or a squirrel cage crusher, and feeding the crushed material into a second-stage screening operation;
feeding the fine-grained materials screened by the second section into a pneumatic conveying bin;
coarse fraction materials are fed into a three-way material separator, a vibrating conveyor or a rubber belt conveyor and then are respectively fed into a loading bin and returned to the final-stage crushing operation after being transported;
(3) grinding: feeding materials in the pneumatic conveying bin into the ore grinding bin, feeding the materials in the ore grinding bin into the mill through the quantitative feeding device, feeding the ground materials into the vibrating screen through the pneumatic conveying device, returning the oversize materials to the mill, circulating the materials in the mill, and returning the undersize materials to the fine powder cost bin.
The invention relates to a multistage crushing method for blocky solids, which further adopts the preferable technical scheme that: the multi-stage crushing method is suitable for crushing inflammable and explosive powder.
The invention relates to a multistage crushing method for blocky solids, which further adopts the preferable technical scheme that: the size of the multilayer sieve pores of one section of screening is a double-layer sieve, the sieve pores of the lower layer sieve are 1-5 mm, preferably 1-3 mm, and the sieve pores of the upper layer sieve are 8-25 mm, preferably 10-20 mm.
The invention relates to a multistage crushing method for blocky solids, which further adopts the preferable technical scheme that: the two-section sieve is a single-layer sieve, and sieve pores are 1-15 mm, preferably 3-6 mm.
The invention relates to a multistage crushing method for blocky solids, which further adopts the preferable technical scheme that: the first stage screening selects a circular vibrating screen, and the second stage screening selects a linear screen or a translational screen according to the properties of materials.
The invention relates to a multistage crushing method for blocky solids, which further adopts the preferable technical scheme that: the materials in the ore grinding bin are fed to the rotor scale feeder through the pipeline vibrating feeder and then fed into the grinding machine through the vibrating conveyor.
The invention relates to a multistage crushing method for blocky solids, which further adopts the preferable technical scheme that: when the grade number of the basic pole crushing is two-grade or three-grade, the material after the first-grade crushing is conveyed to the second-grade crushing by a high-inclination-angle rubber belt conveyor or a bucket elevator, and an iron remover is additionally arranged at the conveying section.
The invention relates to a multistage crushing method for blocky solids, which further adopts the preferable technical scheme that: an intermediate buffer ore bin is arranged above the short-head cone crusher for three-stage crushing, and an intermediate buffer bin is also arranged above the high-pressure roller mill or the squirrel cage crusher for the final-stage crushing operation.
The invention relates to a multistage crushing method for blocky solids, which further adopts the preferable technical scheme that: in the whole crushing and screening working section, a sealing device is arranged according to the requirement to prevent powder leakage, and meanwhile, nitrogen protection operation is carried out on the crushing of flammable and explosive powder.
The invention relates to a multistage crushing method for blocky solids, which further adopts the preferable technical scheme that: in the method, aiming at the crushing of the flammable and combustible powder, motors of all crushing, conveying and screening devices adopt explosion-proof motors; dust removing equipment is arranged at each blanking point of crushing, conveying and screening operations, and the conveying process is carried out in a negative pressure or positive pressure conveying mode.
The method is a flexible crushing process, different crushing routes and equipment types can be selected for different types of solid minerals, and a high-pressure roller mill or a squirrel cage crusher is adopted in the last section, so that the granularity of the next section of operation is greatly reduced, and the energy consumption of a mill in the next section of operation and the energy consumption of the whole grinding operation are greatly reduced.
The invention is mainly applied to the crushing operation of solid materials, is particularly suitable for inflammable and explosive powder, and has the following beneficial effects compared with the conventional crushing process:
(1) the invention realizes more crushing and less grinding, effectively reduces the energy consumption: according to the invention, the end-section high-pressure roller mill or the squirrel-cage crusher is added for crushing after the conventional crushing operation, so that the granularity of the crushed product can be reduced to below 2mm, and the energy consumption of the subsequent grinding operation is greatly reduced.
(2) Through two-stage screening operation, qualified grain size is screened out in time, over-grinding of materials is avoided, and the grain size of the materials before entering a grinding machine is well guaranteed to be within a narrow range step by step.
Firstly, the invention adopts proper two-stage screening operation to screen out fine powder in time, thereby greatly reducing the powder passing of materials
A chipping phenomenon;
secondly, the invention adopts a high-pressure roller mill or a squirrel cage crusher as superfine crushing equipment at the final section after grading crushing, thereby greatly reducing the granularity of mill feeding and ensuring that the particle size distribution of products at the final milling section is narrower. The materials such as silicon powder, coal powder and the like need to be subjected to a chemical modification procedure after an ore grinding working section, the narrower the particle size fraction of the materials is, the better the powder modification effect is, and the lower the cost is, compared with the traditional grinding process, the method disclosed by the invention has the advantages that the-10 mu m can be reduced by below 1%, and the modification cost can be reduced by 1/4. (3) For flammable and explosive powder, the method is safer and more reliable;
firstly, equipment with better sealing performance such as a bucket elevator, a pipeline vibrating conveyor, a translation sieve, a vibrating conveyor and the like is adopted, and on the other hand, the dust concentration of the whole grinding process and the phenomenon of dust deposition in a plant are greatly reduced by adding dust removing equipment at each blanking point and adopting a negative pressure conveying mode;
secondly, by adding iron removal equipment and adopting an explosion-proof motor at the material conveying section, sparks are prevented from being generated in the whole grinding process;
thirdly, nitrogen protection is added to each key point in the grinding process to reduce the oxygen concentration.
(4) The method realizes the feeding accurate measurement of ore grinding operation: the pipeline vibrating feeder, the rotor scale and the vibrating conveyor are additionally arranged below the ore grinding bin to quantitatively feed materials into the grinding machine, and the material amount entering the grinding machine can be accurately measured through the rotor scale.
(5) The method has flexible crushing productivity: the material is subjected to external selling or self-using two purposes by modes of multi-stage crushing, two-stage screening, three-way material distribution switching and the like.
Detailed Description
The following further describes particular embodiments of the present invention to facilitate further understanding of the present invention by those skilled in the art, and does not constitute a limitation to the right thereof.
Example 1, a multi-stage comminution process for bulk solids comprising the steps of:
(1) when the maximum particle size of the massive solid is 80 mm; feeding the blocky solid into an original block bin, feeding materials in the bin into a high-pressure roller mill or a squirrel cage crusher through bin bottom quantitative feeding equipment and a conveying machine to perform final-stage crushing operation, and feeding the crushed materials into screening operation; feeding the fine-grained materials obtained by screening into a pneumatic conveying bin;
coarse fraction materials are fed into a three-way material separator, a vibrating conveyor or a rubber belt conveyor and then are respectively fed into a loading bin and returned to the final-stage crushing operation after being transported;
(2) grinding: feeding materials in the pneumatic conveying bin into the ore grinding bin, feeding the materials in the ore grinding bin into the mill through the quantitative feeding device, feeding the ground materials into the vibrating screen through the pneumatic conveying device, returning the oversize materials to the mill, circulating the materials in the mill, and returning the undersize materials to the fine powder cost bin.
Example 2, a multi-stage comminution process for bulk solids comprising the steps of:
(1) and (3) crushing operation of a foundation pole: determining the grade number of the basic pole crushing according to the maximum particle size of the blocky solid, wherein when the maximum particle size of the blocky solid is 80-150 mm, the grade number of the basic pole crushing is one grade;
when the block solid is crushed, the block solid is fed into the original block bin, and the materials in the bin are fed to the original block bin through the bin bottom quantitative feeding equipment and the conveying machine
A jaw crusher is selected for primary crushing, and the crushed materials are conveyed to the final-stage crushing operation in the step (2);
(2) and (3) final-stage crushing operation: selecting a high-pressure roller mill or a squirrel cage crusher, and feeding the crushed material into a second-stage screening operation;
feeding the fine-grained materials screened by the second section into a pneumatic conveying bin;
coarse fraction materials are fed into a three-way material separator, a vibrating conveyor or a rubber belt conveyor and then are respectively fed into a loading bin and returned to the final-stage crushing operation after being transported;
(3) grinding: feeding materials in the pneumatic conveying bin into the ore grinding bin, feeding the materials in the ore grinding bin into the mill through the quantitative feeding device, feeding the ground materials into the vibrating screen through the pneumatic conveying device, returning the oversize materials to the mill, circulating the materials in the mill, and returning the undersize materials to the fine powder cost bin.
Example 3, a multi-stage comminution process for bulk solids comprising the steps of:
(1) and (3) crushing operation of a foundation pole: the number of stages of the basal pole breakage is determined by the maximum size fraction of the bulk solid,
when the maximum particle size of the massive solid is 150-500 mm, the foundation is extremely crushed into two stages;
when the maximum crushing granularity of the massive solid is more than +500mm, the foundation is extremely crushed into three levels;
when crushing, the blocky solid is fed into an original blocky bin, materials in the bin are fed to a basic pole crushing operation through bin bottom quantitative feeding equipment and a conveying machine, when the stage number of the basic pole crushing is two-stage or three-stage, a jaw crusher is selected for the first-stage crushing, and the crushed materials are conveyed to the second stage; a jaw crusher or a cone crusher is selected for secondary crushing; feeding the material subjected to the secondary crushing to a first-stage screening operation by a conveying machine, wherein a multi-layer screen is adopted as screening equipment, and three coarse, medium and fine particle grades are screened out; feeding coarse fraction materials into a short-head type cone crusher for three-stage crushing and then feeding the coarse fraction materials into the last-stage crushing operation in the step (2), or directly feeding the coarse fraction materials into the last-stage crushing operation in the step (2);
after being transported by a three-way material separator, a vibration conveyor or a rubber belt conveyor, the medium-grade materials in the first-stage screening operation are respectively fed into a loading bin or the final-stage crushing operation in the step (2); fine fraction materials of a section of screening operation are pneumatically conveyed to a pneumatic conveying bin through a bin pump;
(2) and (3) final-stage crushing operation: selecting a high-pressure roller mill or a squirrel cage crusher, and feeding the crushed material into a second-stage screening operation;
feeding the fine-grained materials screened by the second section into a pneumatic conveying bin;
coarse fraction materials are fed into a three-way material separator, a vibrating conveyor or a rubber belt conveyor and then are respectively fed into a loading bin and returned to the final-stage crushing operation after being transported;
(3) grinding: feeding materials in the pneumatic conveying bin into the ore grinding bin, feeding the materials in the ore grinding bin into the mill through the quantitative feeding device, feeding the ground materials into the vibrating screen through the pneumatic conveying device, returning the oversize materials to the mill, circulating the materials in the mill, and returning the undersize materials to the fine powder cost bin.
Example 4, a multi-stage pulverization method for metal ore and phosphate ore, comprising the steps of:
(1) feeding the blocky solid into an original blocky bin through a loading vehicle, feeding materials in the bin to multi-section crushing operation through a bin bottom quantitative feeding device plate feeder and a conveying machine, wherein the plate feeder adopts variable frequency speed regulation;
(2) the number of the crushing sections is four, a jaw crusher is selected for primary crushing, the crushed material is conveyed to secondary crushing operation through a belt conveyor, and an iron remover is added in the conveying section of the belt conveyor;
(3) a middle buffer ore bin is added above the cone crusher for the secondary crushing operation, and a middle plate feeder or a belt feeder is added at the bottom of the bin to quantitatively feed the cone crusher for the secondary crushing operation;
(4) and feeding the material subjected to secondary crushing to primary screening operation through a belt conveyor, wherein a plurality of layers of screens are selected as screening equipment, and the screen holes are +1mm and +15mm respectively.
(5) Feeding the +15mm material sieved out by the first section of screening into a third-stage crushing operation, wherein the third-stage crushing operation adopts a short-head type cone crusher, a middle buffer ore bin is additionally arranged above the short-head type cone crusher, a belt feeder is additionally arranged at the bottom of a bin to realize quantitative feeding to the crusher, the crushed material is fed into a fourth-stage crushing operation, the material with the grain size of +1 to-15 mm is directly fed into the middle buffer bin of the four-stage crushing operation, and the material with the grain size of-2 mm is conveyed to a powder ore bin in front of a mill by an adhesive tape machine;
(6) the high-pressure roller mill is selected for the four-stage crushing operation, a middle buffering ore bin is additionally arranged above the high-pressure roller mill, a belt feeder is additionally arranged at the bottom of the bin to realize quantitative feeding to the crusher, and the crushed materials are returned to the first-stage screening operation through a rubber belt conveyor to be screened.
Embodiment 5, a method for multi-stage pulverization of non-metallic ore that needs to be pulverized, the method comprising the steps of:
(1) feeding the block solid into an original block bin through a loading vehicle or a grab bucket, and feeding the materials in the bin to multi-section crushing operation through a bin bottom quantitative closed type vibrating feeder or a trough type feeder, wherein the closed type vibrating feeder adopts variable frequency speed regulation;
(2) the number of the crushing sections is four, a jaw crusher is selected for primary crushing, the crushed material is conveyed to secondary crushing operation through a high-inclination-angle rubber belt conveyor or a bucket elevator, and an iron remover is added in a conveying section;
(3) a middle buffer ore bin is added above the jaw crusher for the second-stage crushing operation, and a closed vibrating feeder is added at the bottom of the bin to feed the material to the jaw crusher for the second-stage crushing operation;
(4) feeding the material subjected to secondary crushing to primary screening operation by a belt conveyor, wherein a plurality of screen layers are selected as screening equipment, screen holes are +2mm and +12mm respectively, and a circular vibrating screen is selected as the primary screening operation;
(5) feeding the +12mm material screened out by the first section of screening into a third-stage crushing operation, wherein the third-stage crushing operation adopts a short-head type cone crusher, a middle buffer ore bin is additionally arranged above the short-head type cone crusher, a closed type vibrating feeder is additionally arranged at the bottom of a bin to realize quantitative feeding to the crusher, the crushed material is fed into a middle buffer bin of a fourth-stage crushing operation, the material with the grain size of +2 to-12 mm is transferred through a three-way material distributor and a vibrating conveyor and is respectively fed into a loading bin or a middle buffer bin of the fourth-stage crushing operation, and the material with the grain size of-2 mm is transferred to a bin pump through the vibrating conveyor and is conveyed to the outside of the loading bin or the next-stage mill operation through the bin pump;
(6) the four-stage crushing operation adopts a high-pressure roller mill or a squirrel-cage crusher, a middle buffer ore bin is additionally arranged above the crusher, a closed vibrating feeder is additionally arranged at the bottom of the bin to realize quantitative feeding to the crusher, and the crushed material is fed to the second-stage screening operation through a high-inclination-angle rubber belt or a bucket elevator;
(7) the plus 2mm material that two-stage process screening was sieved out, the material that sieves is through tee bend depiler, and the jigging conveyer transports, gives into the middle surge bin of loading storehouse or level four crushing operation respectively, -2mm material transports to the storehouse pump through the jigging conveyer, transports to the loading storehouse outer round pin or next section mill operation through the storehouse pump.
Embodiment 6, a method for multi-stage pulverization of metallic silicon nuggets, comprising the steps of:
(1) feeding the block solid into an original block bin through a loading vehicle or a grab bucket, and feeding the materials in the bin to multi-section crushing operation through a bin bottom quantitative closed type vibrating feeder or a trough type feeder, wherein the closed type vibrating feeder adopts variable frequency speed regulation;
(2) the number of the crushing sections can be four, a jaw crusher is selected for primary crushing, the crushed material is conveyed to secondary crushing operation through a high-inclination-angle rubber belt conveyor or a bucket elevator, and an iron remover is added in the conveying section;
(3) a middle buffer ore bin is added above the cone crusher for the second-stage crushing operation, and a closed vibrating feeder is added at the bottom of the bin to feed the materials to the cone crusher for the second-stage crushing operation;
(4) feeding the material subjected to secondary crushing to primary screening operation by a belt conveyor, wherein a plurality of screen layers are selected as screening equipment, screen holes are respectively +1mm and +12mm, and a translation screen is selected as the primary screening operation;
(5) feeding a material with the size of +12mm screened out from one section of the screen into a third-stage crushing operation, wherein the third-stage crushing operation adopts a short-head type cone crusher, a middle buffer ore bin is additionally arranged above the short-head type cone crusher, a closed type vibrating feeder is additionally arranged at the bottom of a bin to realize quantitative feeding to the crusher, the crushed material is fed into a middle buffer bin of a fourth-stage crushing operation, the material with the size of +1 to-12 mm is transferred through a three-way material distributor and a vibrating conveyor and is respectively fed into a loading bin or a middle buffer bin of the fourth-stage crushing operation, and the material with the size of-1 mm is transferred to a bin pump through the vibrating conveyor and is conveyed to the loading bin or the next-stage mill operation through the bin pump;
(6) the four-stage crushing operation adopts a high-pressure roller mill, a middle buffer ore bin is additionally arranged above the high-pressure roller mill, a closed vibrating feeder is additionally arranged at the bottom of the bin to realize quantitative feeding to the crusher, and the crushed material is fed to the second-stage screening operation through a high-inclination-angle rubber belt or a bucket elevator;
(7) the plus 1mm material that two-stage process screening was sieved out, the material that sieves is through tee bend depiler, and the jigging conveyer transports, gives into the middle surge bin of loading storehouse or level four crushing operation respectively, -1mm material transports to the storehouse pump through the jigging conveyer, transports to the cost storehouse of ore grinding through the storehouse pump.
(8) The crushed finally qualified materials are quantitatively fed into the mill through the pipeline vibrating feeder, the rotor scale and the vibrating conveyor, and the material amount fed into the mill can be accurately measured through the rotor scale. The ground materials are fed into a vibrating screen through pneumatic conveying equipment, the materials on the screen return to the grinding machine, then the materials circulate in the grinding machine, and the materials under the screen return to a fine powder cost bin.
(9) Sealing powder and adding nitrogen protection are required to be considered in the whole crushing and screening section.
Embodiment 7, a method for multi-stage pulverization of coal briquettes, comprising the steps of:
(1) feeding the block solid into an original block bin through a loading vehicle or a grab bucket, and feeding the materials in the bin to multi-section crushing operation through a bin bottom quantitative closed type vibrating feeder or a trough type feeder, wherein the closed type vibrating feeder adopts variable frequency speed regulation;
(2) the crushing stages adopt three-stage crushing, a jaw crusher is selected for the first-stage crushing, the crushed materials are conveyed to the first-stage screening operation through a rubber belt conveyor, and an iron remover is added in the conveying section;
(3) feeding the material subjected to primary crushing to primary screening operation by a belt conveyor, wherein the screening equipment adopts a single-layer screen, the size of a screen hole is +12mm, and the primary screening operation adopts one of a linear screen, a translation screen or a cylindrical screen;
(4) feeding the +12mm material sieved by the primary screening into a secondary crushing operation, wherein the secondary crushing operation adopts a counter-impact crusher or a double-geared roller crusher, and feeding the crushed material to the secondary screening operation through a belt conveyor;
(5) and (3) screening out +2mm materials by secondary screening, transferring the materials on the screen to third-stage crushing by a vibrating conveyor and conveying the materials to a bin pump by a closed rubber belt conveyor, conveying the materials to the next section of operation by the bin pump, and selecting a translation screen for a screen in the secondary screening operation.
(6) And a high-pressure roller mill is selected for the third-stage crushing operation, a middle buffering ore bin is additionally arranged above the high-pressure roller mill, a closed vibrating feeder is additionally arranged at the bottom of the bin to realize quantitative feeding to the crusher, and the crushed material is fed to the second-stage screening operation through a high-inclination-angle rubber belt or a bucket elevator.
(7) The plus 1mm material that two-stage process screening was sieved out, the material that sieves is through tee bend depiler, and the jigging conveyer transports, gives into the middle surge bin of loading storehouse or level four crushing operation respectively, -1mm material transports to the storehouse pump through the jigging conveyer, transports to the cost storehouse of ore grinding through the storehouse pump.
(8) The crushed finally qualified materials are quantitatively fed into the mill through the pipeline vibrating feeder, the rotor scale and the vibrating conveyor, and the material amount fed into the mill can be accurately measured through the rotor scale. The ground materials are fed into a vibrating screen through pneumatic conveying equipment, the materials on the screen return to the grinding machine, then the materials circulate in the grinding machine, and the materials under the screen return to a fine powder cost bin.
Example 8, a method for multi-stage comminution of solid sylvine, the method comprising the steps of:
(1) feeding the blocky solid into an original blocky bin through a loading vehicle, feeding materials in the bin to multi-section crushing operation through a bin bottom plate type feeder, wherein the plate type feeder adopts variable frequency speed regulation;
(2) the crushing stages adopt three-stage crushing, a jaw crusher is selected for the first-stage crushing, the crushed materials are conveyed to the first-stage screening operation through a rubber belt conveyor, and an iron remover is added in the conveying section;
(3) feeding the material subjected to primary crushing to primary screening operation by a belt conveyor, wherein the screening equipment adopts a single-layer screen, the size of a screen hole is +12mm, and the primary screening operation adopts a circular vibrating screen;
(4) feeding the +12mm material sieved by the primary screening into a secondary crushing operation, wherein the secondary crushing operation adopts a counter-impact crusher or a double-geared roller crusher, and feeding the crushed material to the secondary screening operation through a belt conveyor;
(5) and (3) screening out the +1mm material by secondary screening, feeding the screened material to a third-stage crushing step by using a rubber belt conveyor, feeding the-1 mm material to a fine ore bin by using the rubber belt conveyor, and selecting a high-frequency fine screen as a screen for secondary screening operation.
(6) The high-pressure roller mill or the squirrel cage crusher is selected for the third-stage crushing operation, a middle buffering ore bin is additionally arranged above the high-pressure roller mill or the squirrel cage crusher, a closed vibrating feeder is additionally arranged at the bottom of the ore bin to realize quantitative feeding to the crusher, and the crushed materials are fed to the second-stage screening operation through a rubber belt conveyor.
(7) The plus 1mm material that two-stage process screening was sieved out, the material that sieves is through tee bend depiler, and the jigging conveyer transports, gives into the middle surge bin of loading storehouse or level four crushing operation respectively, -1mm material transports to the storehouse pump through the jigging conveyer, transports to the cost storehouse of ore grinding through the storehouse pump.
Example 9, a method of multi-stage comminution of a cement raw material, comprising the steps of:
(1) feeding the block solid into an original block bin through a loading vehicle or a grab bucket, and feeding the materials in the bin to multi-section crushing operation through a bin bottom quantitative closed type vibrating feeder or a trough type feeder, wherein the closed type vibrating feeder adopts variable frequency speed regulation;
(2) the number of the crushing sections can be four, a jaw crusher is selected for primary crushing, the crushed material is conveyed to secondary crushing operation through a high-inclination-angle rubber belt conveyor or a bucket elevator, and an iron remover is added in the conveying section;
(3) a middle buffer ore bin is added above the jaw crusher for the second-stage crushing operation, and a closed vibrating feeder is added at the bottom of the bin to feed the material to a cone crusher for the second-stage crushing operation;
(4) feeding the material subjected to secondary crushing to primary screening operation by a belt conveyor, wherein a plurality of screen layers are selected as screening equipment, screen holes are respectively +1mm and +12mm, and a circular vibrating screen is selected as the primary screening operation;
(5) feeding the +12mm material sieved out by the first section of screening into a third-stage crushing operation, wherein the third-stage crushing operation adopts a short-head type cone crusher, a middle buffer ore bin is additionally arranged above the short-head type cone crusher, a closed type vibrating feeder is additionally arranged at the bottom of a bin to realize quantitative feeding to the crusher, the crushed material is fed into a middle buffer bin of a fourth-stage crushing operation, the material with the grain size of +1 to-12 mm is transported by a rubber belt conveyor or a bucket elevator and fed into the middle buffer bin of the fourth-stage crushing operation, and the material with the grain size of-1 mm is pneumatically conveyed to a proportioning bin by a bin pump;
(6) the four-stage crushing operation adopts a high-pressure roller mill, a middle buffer ore bin is additionally arranged above the high-pressure roller mill, a closed vibrating feeder is additionally arranged at the bottom of the bin to realize quantitative feeding to a crusher, and the crushed material is fed to the second-stage screening operation through a rubber belt conveyor or a bucket elevator;
(7) and (3) screening out +1mm materials by the two-stage screening, feeding the materials to a middle buffer bin of the four-stage crushing operation by using a material vibrating conveyor, a rubber belt conveyor or a bucket elevator, and pneumatically conveying the-1 mm materials to a proportioning bin by using a bin pump.
Example 10, comparative experiment for coal briquette grinding:
firstly, the purpose of experiment is as follows: the inventor takes the method of the invention as an experimental example, and carries out experimental comparison on a traditional crushing method as a comparative example, and researches the energy consumption of the two and the size distribution of the obtained powder.
II, experimental objects: the blocky solid is coal blocks, and the maximum granularity of the coal blocks is 1000 mm.
Thirdly, an experimental process:
1. experimental example:
the multistage crushing method for the blocky solid comprises the following steps:
(1) and (3) crushing a foundation pole: the number of stages of basic pole crushing is determined to be three by the maximum granularity of 1000mm of the massive solid:
during crushing, give the former block storehouse with solid buggy earlier, the interior material of storehouse gives to the extremely broken operation of basis through bottom of storehouse dosing equipment, conveying machinery, wherein:
a jaw crusher is selected for primary crushing, and the crushed material is conveyed to the secondary crushing; a jaw crusher or a cone crusher is selected for secondary crushing; feeding the material subjected to the secondary crushing to a first-stage screening operation by a conveying machine, wherein a multi-layer screen is adopted as screening equipment, and three coarse, medium and fine particle grades are screened out; feeding the coarse fraction material into a short-head type cone crusher for three-stage crushing and then feeding the coarse fraction material into the last-stage crushing operation in the step (2);
after being transported by a three-way material separator, a vibration conveyor or a rubber belt conveyor, the medium-grade materials in the first-stage screening operation are respectively fed into a loading bin or the final-stage crushing operation in the step (2); fine fraction materials of a section of screening operation are pneumatically conveyed to a pneumatic conveying bin through a bin pump;
(2) final crushing operation (four-stage crushing of high-pressure roller mill): selecting a high-pressure roller mill, and feeding the crushed material into a second-stage screening operation;
feeding the fine-grained materials screened by the second section into a pneumatic conveying bin;
coarse fraction materials are fed into a three-way material separator, a vibrating conveyor or a rubber belt conveyor and then are respectively fed into a loading bin and returned to the final-stage crushing operation after being transported;
(3) grinding: feeding materials in the pneumatic conveying bin into the ore grinding bin, feeding the materials in the ore grinding bin into the mill through the quantitative feeding device, feeding the ground materials into the vibrating screen through the pneumatic conveying device, returning the oversize materials to the mill, circulating the materials in the mill, and returning the undersize materials to the fine powder cost bin.
The size of the multi-layer sieve pores of the first section of sieve is a double-layer sieve, and the sieve pores are respectively 4mm and 25 mm; directly feeding products with the diameter of-4 mm into a crushed finished product bin, feeding the products with the diameter of +4mm to-25 mm into a final crushing operation, feeding the materials with the diameter of +25mm into a three-section crushing operation, and returning the products of the three-section crushing operation to a first-section screening operation. And (4) two-stage screening operation, wherein the screen is a single-layer screen with 4mm screen holes.
2. Comparative example:
the traditional grinding process is adopted, and the steps are as follows:
(1) firstly, feeding the coal blocks into an original block bin through a loading vehicle, and feeding materials in the bin to crushing operation through a bin bottom feeder;
(2) the crushing stage number adopts three-section crushing, a jaw crusher is selected for one-level crushing, the crushed material is fed into two-section crushing operation through a rubber belt conveyor, a cone crusher is adopted for two-section crushing, the crushed product of the two-section crushing operation is fed into one-section screening operation, a single-layer screen is selected as a screen of the one-section screening operation, and the screen hole is 15 mm.
(3) And feeding the oversize products subjected to the first-stage screening operation into a three-stage crushing operation, returning the materials subjected to the third-stage crushing operation to the first-stage screening operation, and feeding the undersize materials into a crushed finished product bin.
(4) And feeding the materials in the crushed finished product bin into a dry-type ball mill for grinding.
(5) The ground product is fed into the ground grading operation, the fine fraction of the ground product is fed into the ground finished product bin, and the coarse fraction is returned to the grinding machine.
Fourthly, experimental results:
1. the following table 1 is a comparison table of energy efficiency of the pulverizing operation of the comparative example and the experimental example of the present invention:
as can be seen from Table 1, the energy efficiency of the pulverizing section is 50% higher than that of the milling section, and it can be seen that if the particle size of the fed material is reduced as much as possible before the milling section, the energy consumption and the power consumption of the whole pulverizing operation can be greatly reduced.
2. Table 2 shows the particle size distribution comparison table of the method of the experimental example of the present invention and the comparative example:
as can be seen from Table 2, compared with the conventional grinding process, the over-grinding phenomenon of the present invention is greatly reduced, and the yield of the grinding section is greatly reduced
The grain size of the product is very narrow step by step, the fine grain size only accounts for about 5-20%, and the grain size of the final ground product is better step by step due to the narrow step of the crushed product. The decrease of-10 μm can be below 1% (substantially none).
Claims (2)
1. A multi-stage crushing method for blocky solids is characterized in that the multi-stage crushing method is suitable for crushing inflammable and explosive powder; the method comprises the following steps:
(1) and (3) crushing operation of a foundation pole: determining the grade number of the basic pole crushing from the maximum size fraction of the massive solid, wherein the grade number of the basic pole crushing is zero to three:
when the maximum granularity of the massive solid is 80mm or below, the grade number of the basic extremely-broken solid is zero grade;
when the maximum granularity of the massive solid is 80-150 mm, the number of the stage of the basic extreme crushing is one stage;
when the maximum granularity of the massive solid is 150-500 mm, the stage number of the basic extreme crushing is two stages;
when the maximum crushing granularity of the massive solid is more than 500mm, the number of stages of basic extreme crushing is three;
during crushing, give the former block storehouse with this cubic solid earlier, the interior material of storehouse gives to the extremely broken operation of basis through bottom of the storehouse dosing equipment, conveying machinery, wherein:
when the grade number of the basic pole crushing is zero grade, directly carrying out the last-stage crushing operation in the step (2) on the materials in the bin;
when the stage number of the basic pole crushing is one stage, a jaw crusher is selected for the first stage crushing, and the crushed material is conveyed to the last stage crushing operation in the step (2);
when the grade number of the basic pole crushing is two-grade or three-grade, a jaw crusher is selected for the first-grade crushing, and the crushed material is conveyed to the second-grade crushing; a jaw crusher or a cone crusher is selected for secondary crushing; feeding the material subjected to the secondary crushing to a first-stage screening operation by a conveying machine, wherein a multi-layer screen is adopted as screening equipment, and three coarse, medium and fine particle grades are screened out; feeding coarse fraction materials into a short-head type cone crusher for three-stage crushing and then feeding the coarse fraction materials into the last-stage crushing operation in the step (2), or directly feeding the coarse fraction materials into the last-stage crushing operation in the step (2);
transporting the medium-grade materials subjected to the first-stage screening operation by a three-way material separator, a vibrating conveyor or a rubber belt conveyor, and then respectively feeding the medium-grade materials into a loading bin or the final-stage crushing operation in the step (2); fine fraction materials of a section of screening operation are pneumatically conveyed to a pneumatic conveying bin through a bin pump;
(2) and (3) final-stage crushing operation: selecting a high-pressure roller mill or a squirrel cage crusher, and feeding the crushed material into a second-stage screening operation;
feeding the fine-grained materials screened by the second section into a pneumatic conveying bin;
coarse fraction materials are fed into a three-way material separator, a vibrating conveyor or a rubber belt conveyor and then are respectively fed into a loading bin and returned to the final-stage crushing operation after being transported;
(3) grinding: feeding materials in a pneumatic conveying bin into an ore grinding bin, feeding the materials in the ore grinding bin into a grinding machine through quantitative feeding equipment, feeding the ground materials into a vibrating screen through the pneumatic conveying equipment, returning oversize materials to the grinding machine, circularly crushing the oversize materials in the grinding machine, and returning undersize materials to a fine powder cost bin;
the size of the multi-layer sieve pores of the first-stage sieve is a double-layer sieve, the sieve pores of the lower-layer sieve are 1-5 mm, and the sieve pores of the upper-layer sieve are 8-25 mm;
the second-stage sieve is a single-layer sieve, and sieve pores are 1-15 mm;
the materials in the ore grinding bin are fed to the rotor scale feeder through the pipeline vibrating feeder and then fed into the grinding machine through the vibrating conveyor;
when the stage number of the basic pole crushing is two-stage or three-stage, the material after the first-stage crushing is conveyed to the second-stage crushing by a high-inclination-angle rubber belt conveyor or a bucket elevator, and an iron remover is added in a conveying section;
a middle buffer ore bin is arranged above the short-head cone crusher for three-stage crushing, and a middle buffer bin is also arranged on the high-pressure roller mill for the final-stage crushing operation;
in the whole crushing and screening working section, a sealing device is arranged according to the requirement to prevent powder leakage, and nitrogen protection operation is carried out at the same time; motors of all crushing, conveying and screening devices adopt explosion-proof motors; and dust removing equipment is arranged at each blanking point of the crushing, conveying and screening operations, and the conveying process is carried out in a negative pressure or positive pressure conveying mode.
2. The multistage comminution method for lumpy solids according to claim 1, characterized in that: the sieve holes of the lower layer sieve of the first section of sieve are 1-3 mm, and the sieve holes of the upper layer sieve are 10-20 mm; the sieve holes of the two-section screening are single-layer screening and are 3-6 mm; the first stage screening selects a circular vibrating screen, and the second stage screening selects a linear screen or a translational screen according to the properties of materials.
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