CN111468268B - Pellet composite ore grinding system and pellet composite ore grinding method - Google Patents

Pellet composite ore grinding system and pellet composite ore grinding method Download PDF

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CN111468268B
CN111468268B CN202010295512.0A CN202010295512A CN111468268B CN 111468268 B CN111468268 B CN 111468268B CN 202010295512 A CN202010295512 A CN 202010295512A CN 111468268 B CN111468268 B CN 111468268B
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bin
batching
mixer
ore
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CN111468268A (en
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裴元东
张俊杰
张卫华
顾建苛
沈鸿豪
张巧玉
王知学
周翔
黄定忠
盛建华
陈子建
刘建波
刘桐
孙晨
夏强
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Zenith Steel Group Co Ltd
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Zenith Steel Group Co Ltd
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/80—Mixing plants; Combinations of mixers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/80—Mixing plants; Combinations of mixers
    • B01F33/81—Combinations of similar mixers, e.g. with rotary stirring devices in two or more receptacles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/80—Mixing plants; Combinations of mixers
    • B01F33/82—Combinations of dissimilar mixers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/80—Mixing plants; Combinations of mixers
    • B01F33/83—Mixing plants specially adapted for mixing in combination with disintegrating operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/80—Mixing plants; Combinations of mixers
    • B01F33/834—Mixing in several steps, e.g. successive steps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/02—Roasting processes
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/2406—Binding; Briquetting ; Granulating pelletizing
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/242—Binding; Briquetting ; Granulating with binders
    • C22B1/243—Binding; Briquetting ; Granulating with binders inorganic

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  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
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  • General Life Sciences & Earth Sciences (AREA)
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  • Manufacturing & Machinery (AREA)
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  • Manufacture And Refinement Of Metals (AREA)

Abstract

The invention relates to a pellet compound ore grinding system and a pellet compound ore grinding method, which comprise the processes of pre-batching, dry grinding, wet grinding, fine powder pre-batching, a first mixer, a high-pressure roller mill, batching, a mixer 2, pelletizing and pellet high temperature. After the iron ore powder is pre-blended, 20-80% of the materials are subjected to dry grinding, the rest materials are subjected to wet grinding, after the iron ore powder and the rest materials are ground and discharged, fine powder which is prepared in a fine powder pre-blending ring section is mixed in a first mixer, the mixed materials are subjected to high-pressure roller grinding to improve the specific surface area, or the mixed materials are directly fed into a blending bin through a bypass after ore grinding; and then the rolled material is mixed with bentonite, flux and the like in a mixing chamber, the mixture is mixed for the second time, and finally pelletizing and high-temperature roasting of the pellets are carried out. The invention integrates two ore grinding processes in a set of pelletizing process, has the advantages of strong adaptability to the variety of ore powder, lightening the high moisture pressure of the high-pressure roller mill, improving the grain size composition of pellet refined powder and the like, and has obvious advantages compared with the single ore grinding process.

Description

Pellet composite ore grinding system and pellet composite ore grinding method
Technical Field
The invention relates to a pellet compound grinding system and a pellet compound grinding method.
Background
The pellets are an important feeding link of a blast furnace burden structure in the steel industry, and the pellets occupy 15% of the burden structure in China; compared with the sintered ore which accounts for 70-80% of the charging material structure (the rest is lump ore), the pellet ore has the characteristics of less pollutant discharge, low energy consumption and the like. In recent years, with the increase of environmental protection pressure in various regions, the production of domestic sintering machines is frequently limited, and the production lines of pellets are gradually increased. The europe and north america have already used pellets as the main material for their blast furnaces, and even realized 100% pellet charging. The progressive promotion of the pellet ore by combining the resource conditions of the pellet ore is the development direction of domestic agglomeration.
The key difference between sintering and pelletizing is the difference in the demand of raw materials, the sintered ore can be produced by only using rich ore powder with the particle size of 0-8mm, and the pellet needs iron fine powder with the particle size of less than 200 meshes (namely, the particle size of 0.074mm) as the raw material. Historically, one bottleneck in the development of pellets is that the price of fine pellet powder is significantly higher than that of rich mineral powder for sintering, and the direct import of the rich mineral powder for producing sintered ore has the characteristic of low cost. In recent years, some pelletizing plants begin to adopt a mode of producing fine powder by grinding rich mineral powder, and the method has the effect of reducing the cost compared with the method of directly purchasing the fine powder externally, thereby reducing the raw material cost of pellet for enterprises.
The ore grinding mode in the pelletizing field generally comprises dry grinding and wet grinding, and a wet grinding process is widely applied. However, the investment of the wet grinding process is relatively high, for example, the hard ore with coarser granularity can meet the granularity requirement of the final product (for example, the proportion below 200 meshes reaches more than 80%) by one-stage ball milling, and the investment and the occupied area are both high by two-stage ball milling; and the water content of the ore powder after ore grinding is high, the water content can be controlled not to be too high by better filtering or filter pressing equipment, even a drying kiln process is needed to be added in the follow-up process after the ore grinding process, the water content is reduced from 10-11% or even higher to be within 8.5%, and then the next roll grinding process can be carried out (if the roll grinding process is set). Part of factories and mines adopt a dry grinding process, the water content of discharged materials is less than 3%, the requirement of subsequent pelletizing can be met only by adding a large amount of water in a mixing link after the mineral powder is subjected to dry grinding (the water adding pressure in a pelletizing link is reduced), and the product obtained after the pure dry grinding process is matched with other high-moisture fine powder, and the problem that the materials are difficult to be rolled due to large water difference is faced if the materials are rolled.
The invention provides a composite grinding process, which realizes the coupling of two ore grinding processes, realizes the complementation of quality and quality, expands the mineral powder resource for pellet grinding and realizes the maximization of pellet benefit through reasonable process configuration.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to overcome the defects that the wet grinding investment is high, the discharged water content is difficult to control, the water difference uniformity of different materials influences the high-pressure roller grinding operation and the like in the existing pellet grinding technology, the invention provides a pellet composite grinding system and a pellet composite grinding method, which realize the coupling of a dry grinding and wet grinding process and greatly improve the adaptability to iron ore powder resources.
The technical scheme adopted by the invention for solving the technical problems is as follows: the device comprises an abrasive material pre-preparation system, a first mixer, a high-pressure roller mill, a batching system, a second mixer, a pellet pelletizer and pellet roasting equipment which are sequentially connected through conveying equipment;
the abrasive material pre-preparation system consists of a pre-preparation dry grinding mechanism, a pre-preparation wet grinding mechanism and a fine powder pre-preparation mechanism which are arranged in parallel; the first mixer is used for carrying out first-pass mixing on dry grinding materials produced by the pre-batching dry grinding mechanism, wet grinding materials produced by the pre-batching wet grinding mechanism and fine powder pre-batching materials output by the fine powder pre-batching mechanism; the high-pressure roller mill is used for carrying out high-pressure roller milling on the first mixture produced by the first mixer; the batching system comprises a flux bin, a bentonite bin and a dedusting ash bin which are arranged in parallel; and the second mixer is used for carrying out second mixing on the fusing agent, the bentonite, the dedusting ash and the high-pressure roller grinding material produced by the high-pressure roller grinder, which are conveyed by the batching system.
Furthermore, the batching system also comprises a dry grinding material bin which is connected with the flux bin, the bentonite bin and the dedusting ash bin in parallel, and the pre-batching dry grinding mechanism is connected with the dry grinding material bin through a conveying device;
and/or the batching system further comprises a wet grinding material bin which is connected with the flux bin, the bentonite bin and the dedusting ash bin in parallel, and the pre-batching wet grinding mechanism is connected with the wet grinding material bin through a conveying device;
and/or the first mixer is connected with the batching system through a conveying device.
Furthermore, the pre-batching dry grinding mechanism comprises a dry grinding material conveying line, a first mineral powder bin, a first flux bin and a first fuel bin which are arranged on the dry grinding material conveying line in parallel, wherein the discharge end of the dry grinding material conveying line is connected with a dry grinding machine, and the dry grinding machine is used for receiving and dry grinding materials conveyed by the first mineral powder bin, the first flux bin and the first fuel bin; at least 2 first mineral powder bins are arranged on the dry grinding material conveying line in parallel.
Furthermore, the pre-batching wet grinding mechanism comprises a wet grinding material conveying line, a second mineral powder bin, a second flux bin and a second fuel bin which are arranged on the wet grinding material conveying line in parallel, wherein the discharge end of the wet grinding material conveying line is connected with a wet grinding machine, and the wet grinding machine is used for receiving and wet grinding materials conveyed by the second mineral powder bin, the second flux bin and the second fuel bin; at least 2 second mineral powder bins are arranged on the wet grinding material conveying line in parallel.
Further, the refined flour is prepared the feed mechanism in advance and is included refined flour preparation pipeline and parallelly connected 2 at least refined powder storehouses that set up on refined flour preparation pipeline.
Further, the first mixer is a forced mixer or a roller mixer, and aims to stir dry materials and wet materials to enable the moisture to be uniform; then the mixture is subjected to high-pressure roller milling, and the high efficiency of the rolling operation is realized by uniform and low moisture (3-8%); if the specific surface area of all the materials meets the requirement of the pellets, the materials can be directly proportioned by bypassing without high-pressure roller milling. The second mixer is a forced mixer so as to uniformly distribute various materials of the pellets.
Further, the pellet roasting equipment is a belt type roasting machine or a chain loop device.
The advantage of the flux three-position arrangement is that the requirement of multi-component and multi-flux types of the pellets in the future can be met. The flux added in the dry and wet grinding stages is the flux with a relatively coarse particle size of 0-10 mm; the flux after the high-pressure roller milling is required to be fine, and the granularity of the flux meets 200 meshes and is more than 80 percent. Therefore, the flux can be distributed separately according to the granularity and the kind.
For example: producing magnesium-containing balls, namely directly purchasing MgO magnesium powder, and placing the MgO magnesium powder in a flux bin after high-pressure roller grinding; or purchasing dolomite with coarse particle size, and adding in the dry grinding or wet grinding stage to grind with the mineral powder. Therefore, the adaptability of the patent to various flux resource changes can be improved.
The method for carrying out the composite grinding of the pellets based on the composite grinding system of the pellets comprises the following steps:
feeding 20-80% of the mass of the pre-ingredients into a pre-ingredient dry grinding mechanism, performing dry grinding to prepare a dry grinding material, feeding the rest of the pre-ingredients into a pre-ingredient wet grinding mechanism, and performing wet grinding to prepare a wet grinding material; the fine powder pre-batching output by the dry grinding material, wet grinding material and fine powder pre-batching mechanism is sent into a first mixer, a first mixture is prepared after first mixing, the first mixture is sent into a high-pressure roller mill, and is prepared after high-pressure roller milling or high-pressure roller milling material is sent into a second mixer together with bentonite, a fusing agent and dedusting ash of a batching system, a second mixture is prepared after second mixing, the second mixture is sent into a pellet pelletizer, and is sent into pellet roasting equipment for roasting after pelletizing; the pre-burden at least comprises a mineral powder pre-burden.
The water content of the dry grinding material is between 0.5 and 4 percent, and the water content of the wet grinding material is between 8 and 11 percent; the water content of the mixture formed by mixing the two is 3-8%.
The refined flour is generally 8-10% of its own water content (influenced by rainy season, transportation, etc.). The water content of the dry grinding material and the wet grinding material is 3-8% after being mixed, even if fine powder with the water content of 10% is added, the whole water content is below 8%, and the problems that the subsequent water content is high and the high-pressure roller milling is difficult to carry out are solved.
Further, the dry grinding can adopt a traditional vertical grinding process for slag grinding, the wet grinding can adopt a traditional ball-milling wet grinding process, and the one-stage or two-stage ore grinding process can be adopted.
Further, the distribution of the two ore grinding processes meets the requirements of the components of the pellet materials, and the additives (fuel or flux) added besides the ore powder during the pre-proportioning process can be switched between dry grinding and wet grinding according to the ore grinding processes.
Furthermore, materials generated by the two ore grinding processes can directly enter the proportioning bin according to the granularity condition without being subjected to roller grinding; or mixing with other refined flour after being mixed, then entering a roller mill system, and then mixing.
Further, the distribution of the two ore grinding processes meets the requirements of the components of the pellet materials, and the additives (fuel or fusing agent) added in addition to the ore powder pre-proportioning during the pre-proportioning process can be switched between dry grinding and wet grinding according to the ore grinding processes.
The invention has the beneficial effects that: 1) the wet grinding system does not need to be provided with an expensive filter press for controlling moisture, the requirement on the filter press is reduced, and the pressure of high moisture brought to the subsequent process is adjusted by configuring a dry grinding system. 2) When the granularity meets the requirement, the products after wet grinding and dry grinding have a bypass which bypasses the high-pressure roller mill, so that the consumption of continuous rolling is saved; 3) the product after wet grinding and dry grinding is combined with various directly purchased fine powders, and is primarily mixed by a first mixer before entering rolling, so that the homogenization of water is realized, and meanwhile, the water content is lower than that of the traditional wet grinding process or the directly purchased fine powders, and the efficiency of a rolling machine is favorably improved. 4) According to different iron ore powder resources, dry grinding or wet grinding technology is selectively adopted for processing, and the maximization of ore grinding efficiency is realized.
In addition, compared with the traditional two-stage ball milling process, the pellet obtained by the invention has the advantages that the material granularity is further refined, the consumption of pellet bentonite is reduced by more than 2kg/t, and the quality and grade of the pellet are improved.
Drawings
The invention is further described with reference to the following figures and embodiments.
Fig. 1 is a schematic view of a composite pellet grinding apparatus in an embodiment of the present invention.
Fig. 2 shows a process of composite grinding of pellets in an embodiment of the present invention.
The reference numbers in the figures are: 1. the device comprises a first ore powder bin, 2, a first flux bin, 3, a first fuel bin, 4, a second ore powder bin, 5, a second flux bin, 6, a second fuel bin, 7, a dry grinding machine, 8, a wet grinding machine, 9, a fine powder bin, 10, a first mixer, 11, a high-pressure roller mill, 12, a wet grinding material bin, 13, a dry grinding material bin, 14, a third flux bin, 15, a bentonite bin, 16, a dedusting ash bin, 17, a second fuel bin, 18, a pellet pelletizer and 19, pellet roasting equipment.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
The specific embodiment of the invention is shown in fig. 1, which is a device for compound grinding of pellets, and the compound grinding system of pellets comprises an abrasive material pre-preparation system, a first mixer 10, a high-pressure roller mill 11, a batching system, a second mixer 17, a pellet pelletizer 18 and a pellet roasting device 19 which are sequentially connected and arranged through a conveying device.
The abrasive material pre-preparation system consists of a pre-preparation dry grinding mechanism, a pre-preparation wet grinding mechanism and a fine powder pre-preparation mechanism which are arranged in parallel; the first mixer 10 is used for carrying out first mixing on dry grinding materials produced by the pre-batching dry grinding mechanism, wet grinding materials produced by the pre-batching wet grinding mechanism and fine powder pre-batching materials output by the fine powder pre-batching mechanism; the high-pressure roller mill 11 is used for high-pressure roller milling the first mixture produced by the first mixer 10; the batching system comprises a third flux bin 14, a bentonite bin 15 and a dedusting ash bin 16 which are arranged in parallel; the second mixer 17 is used for carrying out a second mixing of the flux, bentonite, fly ash and high-pressure roll mill material produced by the high-pressure roll mill 11 which are conveyed by the batching system.
The batching system also comprises a dry grinding material bin 13 which is connected with a third flux bin 14, a bentonite bin 15 and a dedusting ash bin 16 in parallel, and the pre-batching dry grinding mechanism is connected with the dry grinding material bin 13 through a conveying device.
The batching system also comprises a wet grinding material bin 12 which is connected with a third flux bin 14, a bentonite bin 15 and a dedusting ash bin 16 in parallel, and the pre-batching wet grinding mechanism is connected with the wet grinding material bin 12 through a conveying device.
In particular, the first mixer 10 is connected to the batching system by means of a conveying device, which may be a conveyor or a conveyor belt or a screw conveyor, or the like, as is commonly used in the art.
The pre-burdening dry grinding mechanism comprises a dry grinding material conveying line, a first mineral powder bin 1, a first flux bin 2, a first fuel bin 3 and a dry grinding machine 7, wherein the first mineral powder bin 1, the first flux bin 2, the first fuel bin 3 and the dry grinding machine 7 are arranged on the dry grinding material conveying line in parallel, the discharge end of the dry grinding material conveying line is connected with the dry grinding machine 7, and the dry grinding machine 7 is used for receiving and dry grinding materials conveyed by the first mineral powder bin 1, the first flux bin 2 and the first fuel bin 3; the first ore powder bins 1 are 3 and are arranged on the dry grinding material conveying line in parallel.
The pre-batching wet grinding mechanism comprises a wet grinding material conveying line, a second mineral powder bin 4, a second flux bin 5, a second fuel bin 6 and a wet grinding machine 8 which are arranged on the wet grinding material conveying line in parallel, wherein the discharge end of the wet grinding material conveying line is connected with the wet grinding machine 8, and the wet grinding machine 8 is used for receiving and wet grinding materials conveyed by the second mineral powder bin 4, the second flux bin 5 and the second fuel bin 6; the second ore powder bins 4 are 3 and are arranged on the wet grinding material conveying line in parallel.
The fine powder pre-batching mechanism comprises a fine powder pre-batching conveying pipeline and 5 fine powder bins 9 which are arranged on the fine powder pre-batching conveying pipeline in parallel, the first mixing machine 10 is a strong mixing machine or a roller mixing machine, the second mixing machine 17 is a strong mixing machine, and the pellet roasting equipment 19 is a belt type roasting machine or a chain loop-back device.
Referring to fig. 2, a method for composite grinding of pellets is performed based on the composite grinding system of pellets, and includes the following steps:
feeding 20-80% of the mass of the pre-ingredients into a pre-ingredient dry grinding mechanism, performing dry grinding to prepare a dry grinding material, feeding the rest of the pre-ingredients into a pre-ingredient wet grinding mechanism, and performing wet grinding to prepare a wet grinding material; the fine powder pre-batching output by the dry grinding material, wet grinding material and fine powder pre-batching mechanism is sent into a first mixer 10, a first mixture is prepared after first mixing, the first mixture is sent into a high-pressure roller mill 11, high-pressure roller grinding material is prepared after high-pressure roller milling, the high-pressure roller grinding material, bentonite, a fusing agent and dedusting ash of a batching system are sent into a second mixer 17 together, a second mixture is prepared after second mixing, the second mixture is sent into a pelletizing pelletizer 18, and the second mixture is sent into a pelletizing roasting device 19 for roasting after pelletizing; the pre-burden at least comprises mineral powder pre-burden.
The water content of the dry grinding material is between 0.5 and 4 percent, and the water content of the wet grinding material is between 8 and 11 percent; the water content of the mixture formed by mixing the two is 3-8%, and the pre-mixture also comprises flux and fuel.
Based on the device for the composite grinding of the pellets in this embodiment, the composite grinding process of the pellets is specifically described in the following embodiments:
example 1
The scheme of composite ore grinding and batching of the pellets is detailed in table 1:
TABLE 1 pellet grinding and compounding protocol,% (by weight)
Figure GDA0003176824400000081
In Table 1, Ig means the burning loss, if the iron ore powder is magnetite, that is, the FeO content is high, the iron ore powder is oxidized and increased in weight during the roasting process, and the final burning loss is expressed as negative numbers (such as burning loss "-2.2%," -2.3% ").
The process of the pellet composite ore grinding specifically comprises the following steps: carrying out dry grinding treatment on iron ore powder A (the dosage is 50 percent of the total mass of the iron ore powder), wherein the proportion of 0-8mm before grinding accounts for 91 percent, a finished product with 0-200 meshes accounting for 90 percent is formed after grinding, the water content before grinding is 8.5 percent, and the water content after grinding is 2.0 percent; carrying out wet grinding treatment on iron ore powder B (the dosage is 50 percent of the total mass of the iron ore powder), wherein the proportion of 0-8mm before grinding accounts for 85 percent, a finished product with 0-200 meshes accounting for 80 percent is formed after grinding, the water content before grinding is 9.0 percent, and the water content after grinding is 10.0 percent; the proportion of the two in ore grinding is 50 percent respectively, and the water content of mixed fine powder formed after ore grinding is 6.0 percent. The two are matched with mixed fine powder of fine powder C (Minus fine powder of England resource group), fine powder D (Australian fine powder of Zhongxintafu), fine powder E (fine powder from Ukrainian) and fine powder F (fine powder from Canada) from a fine powder pre-batching mechanism through a belt to form mixed ore, the mixed ore enters a first mixer 10 to be uniformly mixed to form mixed ore with the average water content of 7.4 percent, the mixed ore enters a high-pressure roller mill to improve the specific surface, then 1.5 percent of bentonite, 2 percent of dolomite and 2 percent of dedusting ash based on the mass of the pellet raw materials are matched in a batching chamber, the mixed ore enters a second mixer 17, and the mixer is properly supplemented with water. After mixing, the mixture is sent to a pelletizing chamber for pelletizing, and finally is roasted and cooled on a belt roasting machine to form the final product pellet ore.
In this example, the moisture from the wet mill system, although 10% is normally not suitable for direct feed to the high pressure roll mill (< 8.5% required), is solved by mixing with the dry milled material to ultimately form a mixed ore with only 7.4% moisture.
Example 2
TABLE 2 pellet grinding and compounding protocol,% (by weight)
Figure GDA0003176824400000091
A pellet compound ore grinding system and a pellet compound ore grinding method are disclosed, wherein iron ore powder A is respectively treated by a dry grinding system and a wet grinding system, the dry grinding treatment amount and the wet grinding treatment amount are respectively 50% (50% of the iron ore powder mass) and respectively account for 25% of the total iron material (the fine powder is iron fine powder). In a dry grinding system, an iron ore powder A pre-prepared bin is matched with 3% of dolomite and 1% of anthracite for mixed grinding, the proportion of 0-8mm before grinding accounts for 91%, a finished product with 0-200 meshes accounts for 90% after grinding is formed, the water content before grinding is 8.5%, and the water content after grinding is 2.5%; in a wet grinding system, iron ore powder A is independently mixed for grinding, the proportion of 0-8mm before grinding accounts for 91%, a finished product with 0-200 meshes accounting for 90% is formed after grinding, the water content before grinding is 8.5%, and the water content after grinding is 10.5%;
the fine powder after ore grinding enters a bin of a batching chamber from a bypass and does not enter a first mixer 10 and a rolling system any more; the refined flour C and the refined flour E are pre-blended, pass through the first mixer 10 without rolling due to the particle size meeting the requirement, are connected with the ore grinding product, bentonite, dedusting ash and the like in the blending chamber from a bypass, enter the second mixer 17 together for mixing, and are properly added with water. Then pelletizing and roasting together to finally form the pellet.
In this example, a powder ore is proportioned and fed from the pre-proportioning bin to the dry grinding and the wet grinding, respectively, while considering that the dry grinding system simultaneously grinds the flux and the anthracite (the mixed grinding can also be carried out in the wet grinding system according to the actual effect). Because the granularity of the matched fine powder C and E meets the requirement, all materials can be roasted without a high-pressure roller grinding system.
Subsequently, the ore powder with different hardness can be selectively switched between two ore grinding according to the resource condition. If hard ore difficult to grind is difficult to ensure that the 0-200 meshes in a wet grinding system reach 80%, processing in a dry grinding system; the relatively soft ore dust is processed in a wet grinding system. The two ore grinding systems are both provided with conditions for mixed grinding, and can be used for mixed grinding of coarse dolomite, limestone, anthracite and the like and iron ore powder, so that the production of various pellet ore types is realized.
The invention can also be applied in several ways:
if the moisture of the purchased refined powder meets the requirement of directly rolling and lifting the specific surface, the materials of the dry grinding system and the wet grinding system can directly bypass without first mixing and rolling.
If the moisture of the purchased fine flour is high, but the specific surface needs to be rolled and lifted, the dry grinding system material does not bypass, and is mixed with the fine flour and then subjected to first mixing and rolling, and the wet grinding system material can directly bypass and is not subjected to first mixing and rolling.
Finally, through the coupling of the dry grinding system and the wet grinding system in the pellet grinding project, the drying kiln before rolling is completely cancelled, the low-moisture entering into the rolling system can be realized, and the method is suitable for various resources, thereby reducing the pellet cost.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims (8)

1. The utility model provides a compound ore grinding system of pellet which characterized in that: the device comprises an abrasive material pre-preparation system, a first mixer (10), a high-pressure roller mill (11), a batching system, a second mixer (17), a pellet pelletizer (18) and pellet roasting equipment (19) which are sequentially connected and arranged through conveying equipment;
the abrasive material pre-preparation system consists of a pre-preparation dry grinding mechanism, a pre-preparation wet grinding mechanism and a fine powder pre-preparation mechanism which are arranged in parallel; the first mixer (10) is used for carrying out first mixing on dry grinding materials produced by the pre-batching dry grinding mechanism, wet grinding materials produced by the pre-batching wet grinding mechanism and fine powder pre-batching materials output by the fine powder pre-batching mechanism; the high-pressure roller mill (11) is used for carrying out high-pressure roller milling on the first mixture produced by the first mixer (10); the batching system comprises a third flux bin (14), a bentonite bin (15) and a dedusting ash bin (16) which are arranged in parallel; and the second mixer (17) is used for carrying out second mixing on the fusing agent, the bentonite, the dedusting ash and the high-pressure roller grinding material produced by the high-pressure roller grinder (11) which are conveyed by the batching system.
2. The composite ore grinding system for pellets of claim 1, wherein: the pre-burdening dry grinding mechanism comprises a dry grinding material conveying line, a first mineral powder bin (1), a first flux bin (2) and a first fuel bin (3), wherein the first mineral powder bin (1), the first flux bin (2) and the first fuel bin (3) are arranged on the dry grinding material conveying line in parallel, the discharge end of the dry grinding material conveying line is connected with a dry grinding machine (7), and the dry grinding machine (7) is used for receiving and dry grinding materials conveyed by the first mineral powder bin (1), the first flux bin (2) and the first fuel bin (3); the number of the first ore powder bins (1) is at least 2, and the first ore powder bins are arranged on the dry grinding material conveying line in parallel.
3. The composite ore grinding system for pellets of claim 1, wherein: the pre-batching wet grinding mechanism comprises a wet grinding material conveying line, a second mineral powder bin (4), a second flux bin (5) and a second fuel bin (6), wherein the second mineral powder bin, the second flux bin (5) and the second fuel bin (6) are arranged on the wet grinding material conveying line in parallel, the discharge end of the wet grinding material conveying line is connected with a wet grinding machine (8), and the wet grinding machine (8) is used for receiving and wet grinding materials conveyed by the second mineral powder bin (4), the second flux bin (5) and the second fuel bin (6); and at least 2 second ore powder bins (4) are arranged on the wet grinding conveying line in parallel.
4. The composite ore grinding system for pellets of claim 1, wherein: the fine powder pre-proportioning mechanism comprises a fine powder pre-proportioning conveying pipeline and at least 2 fine powder bins (9) which are arranged on the fine powder pre-proportioning conveying pipeline in parallel.
5. The composite ore grinding system for pellets of claim 1, wherein:
the first mixer (10) is a forced mixer or a drum mixer, and the second mixer (17) is a forced mixer.
6. The composite ore grinding system for pellets of claim 1, wherein: the pellet roasting equipment (19) is a belt type roasting machine or a chain loop device.
7. A method for compound grinding of pellets is characterized in that: the method is carried out based on the composite ore grinding system for pellets as defined in any one of claims 1 to 6, and comprises the following steps:
feeding 20-80% of the mass of the pre-ingredients into a pre-ingredient dry grinding mechanism, performing dry grinding to prepare a dry grinding material, feeding the rest of the pre-ingredients into a pre-ingredient wet grinding mechanism, and performing wet grinding to prepare a wet grinding material; the fine powder pre-batching output by the dry grinding material, wet grinding material and fine powder pre-batching mechanism is sent into a first mixer (10) and is subjected to first mixing to prepare a first mixture, the first mixture is sent into a high-pressure roller mill (11) and is subjected to high-pressure roller milling to prepare a high-pressure roller grinding material, the high-pressure roller grinding material, bentonite, a fusing agent and dedusting ash of a batching system are sent into a second mixer (17) together, and are subjected to second mixing to prepare a second mixture, the second mixture is sent into a pellet pelletizer (18) and is sent into a pellet roasting device (19) for roasting after pelletizing; the pre-batching at least comprises mineral powder pre-batching;
the moisture content of the dry abrasive is between 0.5 and 4 percent (weight percent), and the moisture content of the wet abrasive is between 8 and 11 percent (weight percent); the water content of the mixture formed by mixing the two is between 3 and 8 percent (weight).
8. The method for the composite grinding of the pellets as claimed in claim 7, wherein: the pre-batch also includes flux and fuel.
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CN110273067A (en) * 2019-07-25 2019-09-24 武汉钢铁有限公司 A method of sintering utilizes dedusting ash

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CN107282260A (en) * 2017-07-20 2017-10-24 山东钢铁集团日照有限公司 A kind of pellet screening reuse method
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CN110273067A (en) * 2019-07-25 2019-09-24 武汉钢铁有限公司 A method of sintering utilizes dedusting ash

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