CN104291714B - The production method of vertical mill grinding iron and steel ground-slag, slag powders and steel-making slag powder - Google Patents

The production method of vertical mill grinding iron and steel ground-slag, slag powders and steel-making slag powder Download PDF

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Publication number
CN104291714B
CN104291714B CN201410378735.8A CN201410378735A CN104291714B CN 104291714 B CN104291714 B CN 104291714B CN 201410378735 A CN201410378735 A CN 201410378735A CN 104291714 B CN104291714 B CN 104291714B
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China
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slag
steel
vertical mill
grinding
iron
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CN201410378735.8A
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Chinese (zh)
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CN104291714A (en
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张贤清
杨亮
翁哲峰
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江苏融达新材料股份有限公司
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B5/00Treatment of metallurgical slag; Artificial stone from molten metallurgical slag

Abstract

The present invention relates to the production method of a kind of vertical mill grinding iron and steel ground-slag, slag powders and steel-making slag powder, its innovative point is: by adopting same vertical mill independently to carry out respectively grinding steel-making slag powder, slag powders and iron and steel ground-slag, the steel slag tailings obtaining through slag processing metal recycling step and slag are entered to vertical mill in the ratio of 2~4:8~6 except the slag that metal pretreatment step obtains, by vertical mill grinding iron and steel ground-slag step and vertical mill steel slag grinding feed back iron removal by magnetic separation closed cycle step, realize vertical mill grinding steel slag powder craft again. The present invention has simplified the production stage of conventional steel scum powder, has improved the iron and steel ground-slag uniformity, reduces energy consumption and cost. Production method of the present invention can be at same vertical mill in grinding iron and steel ground-slag, slag powders and steel-making slag powder realize resource recycling respectively, and public most equipment has improved the utilization rate of equipment and resource greatly, reduces manufacturing cost.

Description

The production method of vertical mill grinding iron and steel ground-slag, slag powders and steel-making slag powder
Technical field
The present invention relates to the production method of a kind of vertical mill grinding iron and steel ground-slag, slag powders and steel-making slag powder.
Background technology
China is iron and steel output big country, accounts for whole world total amount nearly 50%, so be also steel slag generation big country. Nearly 9,300 ten thousand tons of annual slag generation, more than 2.2 hundred million ton, slag. Within 1999, afterwards except big steel enterprise first introduces after import equipment production line, domestic vertical mill grinding slag power production line also has up to a hundred to slag utilization; 1.72 hundred million tons of utilization rates 78% of utilization. Steel slag utilization is owing to being subject to research and development and the lagging policy of technology and magnetic separation, pre-grinding equipment, 2,046 ten thousand tons of year utilizations, utilization rate 22%, 1.2123 hundred million tons of steel slag annual capacity of stackings, 11.1753 hundred million tons of accumulative total volume of cargo in storages.
China has formulated respectively steel-making slag powder standard and slag powders standard at 2006 and 2008, but has a long way to go compared with the utilization rate of slag, steel slag utilization rate and developed country approximate 100%.
Major reason is that blast furnace slag becomes fine grained afterwards by flush slag, and then abrasive dust replaces cement to do concrete admixture, and specific activity is larger, use at present better, but also existent defect, such as easily charing dusting, wearability is bad, the easy corrosion of reinforcing bar in volume concrete. The main component of converter slag is silica gel dicalcium and tricalcium silicate, belongs to burning crystal, and the specific activity of burning crystal own is poor, and as cement doping material, its adding proportion is no more than 10%. Add too much, the quality of cement will be subject to steel-making slag powder impact. Steel slag grinding is high with the large cost of ball mill power consumption simultaneously, and enterprise easily loses. Therefore the application of slag is restricted; Also there are some problems in the application aspect paveio(u)r and construction material in slag, in slag, some is that flux becomes, and wherein calcium oxide, magnesia absorb moisture in air, become calcium hydroxide and magnesium hydroxide, and volume can expand, and can crack. The harmful poisonous composition such as Han You Chrome, lead, manganese in slag in addition. In addition, different iron and steel enterprises slag composition differs, and has also affected its application.
The iron and steel ground-slag being mixed in proportion by slag powders and steel-making slag powder just can be got rid of above-mentioned these problems.
In production steel slag powder craft, conventional art is to come single grinding slag powders and other equipment grinding steel-making slag powder with vertical mill both at home and abroad, produces in screw mixer mixing, stirring for the slag powders after separate grinding, steel-making slag powder. Exist cost of investment large, operating cost is high, and composition is not the problems such as very even quality rank is low.
Slag and steel slag tailings to be entered to vertical mill grinding after proportioning in proportion and directly produce iron and steel ground-slag, first will solve is exactly the iron-holder difference of these two kinds of slags, hardness difference, with the factor such as the activity of the vexed slag of heat and hot splashing slag is different, can affect vertical mill efficiency, the series of problems such as Yield and quality and energy consumption. Research is found: even by iron-holder 0.2% left and right in pretreatment control in early stage slag, iron-holder < 1.5% in steel slag tailings, but after two slags enter vertical mill in proportion together, iron in slag easily separates, iron in tailings is not easily separated, feed back enters vertical mill with iron content tailings again, causes and in vertical mill, mixes slag iron-holder > more than 2%, affect vertical mill mill efficiency, output and energy consumption.
And along with social develop rapidly, in the recycling technology of steel, slag, how can effectively improve resource utilization rate, energy-saving and cost-reducing also have higher requirement. Therefore, research and develop a kind of can make full use of resource and reduce the production method of vertical mill grinding iron and steel ground-slag, slag powders and steel-making slag powder of energy resource consumption imperative.
Summary of the invention
The technical problem to be solved in the present invention is to provide the production method of a kind of vertical mill grinding iron and steel ground-slag, slag powders and steel-making slag powder, can utilize slag powders, steel-making slag powder and the iron and steel ground-slag of the direct grinding production of vertical mill high-quality, low energy consumption, simplify production stage, improve the versatility of technique and corollary equipment simultaneously.
For solving the problems of the technologies described above, technical scheme of the present invention is: the production method of a kind of vertical mill grinding iron and steel ground-slag, slag powders and steel-making slag powder, its innovative point is: by adopting same vertical mill independently to carry out respectively grinding steel-making slag powder, slag powders and iron and steel ground-slag, by the recycling of slag processing metal step, vertical mill grinding steel-making slag powder step and vertical mill steel slag grinding feed back iron removal by magnetic separation closed cycle step, realize vertical mill grinding steel-making slag powder technique successively; Remove metal pretreatment step, vertical mill grinding slag powders step and vertical mill slag milling feed back iron removal by magnetic separation closed cycle step by slag successively, realize vertical mill grinding slag powders technique; The slag that the steel slag tailings that process slag processing metal recycling step is obtained and slag obtain except metal pretreatment step enters respectively the secondary batch bin of slag and steel, the main batch bin of slag the ratio in slag and slag component 2~4:8~6 enter vertical mill, by vertical mill grinding iron and steel ground-slag step and vertical mill steel slag grinding feed back iron removal by magnetic separation closed cycle step, realize vertical mill grinding steel slag powder craft again.
Preferably, in described vertical mill grinding steel slag powder craft, vertical mill grinding iron and steel ground-slag step: the slag that the steel slag tailings obtaining through slag processing metal recycling step and slag obtain except metal pretreatment step, carried by conveyer respectively, slag is sent into steel, the main batch bin of slag, steel slag tailings and is sent into the secondary batch bin of slag; And constant feeder by separately enters conveying worm after spraying the grinding aid reinforcing agent of 0.1%wt-0.15%wt after in the ratio proportioning of slag and slag component 2~4:8~6, send into the direct grinding of vertical mill by conveying worm again, control the grinding roller pressure of vertical mill at 12-13MPa, hot blast enters vertical mill temperature 300-350 DEG C, and air quantity is at 20*104-22*104m3/ h, hot blast goes out vertical mill temperature 85-95 DEG C, and the powder concentrator rotating speed of vertical mill, at 110-140r/min, obtains qualified iron and steel ground-slag and underproof steel slag grinding feed back; Described vertical mill steel slag grinding feed back iron removal by magnetic separation closed cycle step is: steel slag grinding feed back is successively through No. three self-discharging type electric-magnetic iron removers, a dry powder permanent-magnet drum type magnetic separator iron removal by magnetic separation, deliver to vertical mill top by an elevator again, through vibrating feed machine vibration cloth, the thickness of feed layer of cloth is less than 20mm, bed of material width is identical with No. two dry powder permanent-magnet drum type magnetic separator magnetic rollers, enter No. two dry powder permanent-magnet drum type magnetic separators again after iron removal by magnetic separation, the another one charging aperture of sending into conveying worm entrance top vertical mill enters vertical mill grinding again.
Preferably, in vertical mill grinding iron and steel ground-slag process, Real-Time Monitoring vertical mill mill vertical direction and horizontal direction amplitude, if vertical direction amplitude > is 2.5mm, when horizontal direction amplitude > 2mm, vertical mill is carried out to inside water spray, injection flow rate is at 0.5-2m3/ h, until vertical direction amplitude < 2.5mm, horizontal direction amplitude < 2mm; In Vertical Mill process, the hot blast temperature simultaneously entering in Real-Time Monitoring vertical mill, at slag with slag component ratio at 1/4 ~ 1/2 o'clock, if 350 DEG C of hot blast temperature > entering will carry out inside to vertical mill and spray water, injection flow rate is at 0.5-2m3/ h, until 350 DEG C of temperature <. At slag and slag component ratio, at 1/2 ~ 2/3 o'clock, if 330 DEG C of hot blast temperature > entering will carry out inside water spray to vertical mill, injection flow rate was at 0.5-2m3/ h, until 330 DEG C of temperature <.
Preferably, in described vertical mill grinding slag powders technique, slag removes metal pretreatment step: the slag storing in slag bank factory building is sent into slag feed bin by crane, carried by conveyer, and carry out deironing, after without magnetic metal, enter vibratory sieve through self-discharging type electric-magnetic iron remover, a metal detector, the slag that is less than Vibration Screen screen distance enters steel, the main batch bin of slag, delivers to conveyer through constant feeder, by No. two self-discharging type electric-magnetic iron remover deironing again.
Preferably, vertical mill grinding slag powders step is: slag is through except after metal pretreatment, then delivers into the direct grinding of vertical mill by conveying worm, obtains qualified slag micropowder and underproof slag milling feed back; Vertical mill slag milling feed back iron removal by magnetic separation closed cycle step is: slag milling feed back is successively through No. three self-discharging type electric-magnetic iron removers, a dry powder permanent-magnet drum type magnetic separator iron removal by magnetic separation, deliver to vertical mill top by an elevator again, through vibrating feed machine vibration cloth, the thickness of feed layer of cloth is less than 20mm, bed of material width is identical with No. two dry powder permanent-magnet drum type magnetic separator magnetic rollers, enter No. two dry powder permanent-magnet drum type magnetic separators again after iron removal by magnetic separation, the another one charging aperture of sending into conveying worm entrance top vertical mill enters vertical mill grinding again.
Preferably, in described vertical mill grinding steel-making slag powder technique, slag processing metal recycling step comprises slag crushing, deironing pretreatment close circulation technology, and the pre-grinding of slag, iron removal by magnetic separation close circulation technology; In slag crushing, deironing pretreatment close circulation technology, slag is first through the screening of hydraulic overturn sieve, and the slag that is less than hydraulic overturn sieve mesh size enters to award feed bin, stable being transported on conveyer after constant feeder weighs, send hydraulic jaw crusher fragmentation to, after fragmentation, can send into storage bin; Be greater than the slag quartering hammer coarse crushing of hydraulic overturn sieve mesh size, again enter the screening of hydraulic overturn sieve after magnechuck deironing, so iterative cycles, guarantees to enter the slag particle diameter of awarding feed bin and is controlled at and is less than in the pore diameter range that hydraulic overturn sieves screen cloth; In the pre-grinding of slag, iron removal by magnetic separation close circulation technology, process slag crushing, the pretreated slag of deironing in storage bin, stable being transported on conveyer after constant feeder weighs, carry out pre-grinding by domestic rod mill and reduce slag particle diameter, and the metallic particles and the sticky slag blanket part wrapping on metal that are attached on slag are peeled off; After pre-grinding, carry out deironing by self-unloading type deferrization device, then enter broadband magnetic separator by wide distributing device and carry out iron removal by magnetic separation; Steel slag tailings after the magnetic separator iron removal by magnetic separation of broadband is by the screening of No. two vibratory sieves, and the steel slag tailings that is greater than No. two Vibration Screen screen distances is got back to storage bin and carried out pre-grinding to again enter domestic rod mill; The steel slag tailings that is less than No. two Vibration Screen screen distances is sent into the steel slag tailings that the adjustable magnetic separator of single roller sends in slag, slag mixing bank factory building after iron removal by magnetic separation again and is stored up district, or directly enters milling production line.
Preferably, vertical mill grinding steel-making slag powder step is: by the steel slag tailings obtaining in slag processing metal recycling step, directly send into steel, the main batch bin of slag by the defeated heap conveyer of rotation, or the steel slag tailings storing in steel, slag mixing bank factory building is sent into slag feed bin by crane, then send into steel, the main batch bin of slag by conveyer; After constant feeder is delivered to conveyer, enter conveying worm, enter the direct grinding of vertical mill, obtain qualified slag micro powder and underproof steel slag grinding feed back; Vertical mill steel slag grinding feed back iron removal by magnetic separation closed cycle step is: steel slag grinding feed back is successively through No. three self-discharging type electric-magnetic iron removers, a dry powder permanent-magnet drum type magnetic separator iron removal by magnetic separation, deliver to vertical mill top by an elevator again, through vibrating feed machine vibration cloth, the thickness of feed layer of cloth is less than 20mm, bed of material width is identical with No. two dry powder permanent-magnet drum type magnetic separator magnetic rollers, enter No. two dry powder permanent-magnet drum type magnetic separators again after iron removal by magnetic separation, the another one charging aperture of sending into conveying worm entrance top vertical mill enters vertical mill grinding again.
Preferably, deduster delivered to by qualified slag powders, steel-making slag powder or iron and steel ground-slag by the powder concentrator in vertical mill, collects by deduster; Slag powders, steel-making slag powder or iron and steel ground-slag that described deduster is collected are sent into elevator No. two by an air conveyer flume, deliver to top, powder storehouse by No. two elevators; Slag powders, steel-making slag powder or iron and steel ground-slag are delivered to corresponding slag powders storehouse, steel-making slag powder storehouse or iron and steel ground-slag storehouse by automatic tee valve by No. two air conveyer flumes in top, powder storehouse.
Preferably, described deduster is air box impulse bag-type dust remover; Thermal current is delivered to chimney by the main exhaust fan of described air box impulse bag-type dust remover, enters vertical mill together with after the thermal current that in chimney, the thermal current circulation loopback of large portion is sent with hot-blast stove is mixed, remainder by smoke stack emission in atmosphere.
Preferably, the lining board for grinding discs inclined angle of described vertical mill is 3 °, and mill and the grinding roller nip angle in the time milling is 5-6 °.
Preferably, described conveyer is belt conveyor.
The invention has the advantages that: (1) the present invention is by carrying out pretreatment to steel slag tailings and slag, proportionally after proportioning, add a certain amount of enhancing grinding aid to enter domestic vertical mill, and coordinate the direct grinding of corresponding equipment and process parameter to produce iron and steel ground-slag, simplify the production stage of conventional steel scum powder, improve the iron and steel ground-slag uniformity, reduced energy consumption and cost. When production method of the present invention can with same vertical mill, grinding iron and steel ground-slag, slag powders and steel-making slag powder realize resource recycling respectively, public most equipment, greatly improve the utilization rate of equipment and resource, reduced Engineering Project and cost of goods manufactured.
(2) by slag processing metal recycling step; Slag deironing, except without magnetic metal pretreatment step; Make steel slag tailings, slag can enter smoothly vertical mill grinding. And iron content grinding feed back is returned back out to vertical mill as early as possible carry out closed cycle three passage iron removal by magnetic separation, metallic iron recycling in deironing measure, overcome the problem of iron-holder overlaying influence output in steel slag tailings and slag, thereby the advanced indexs such as the efficiency, output, energy consumption, roller consumption of vertical mill are protected.
(3) production method of the present invention, the steel-making slag powder output of production reaches 45t/h, and the output of slag powders reaches 60t/h, and steel slag powder yield reaches 52-58t/h, steel-making slag powder specific area > 460m2/ kg, slag powders specific area > 430 ㎡/kg, iron and steel ground-slag specific area > 460 ㎡/kg, meets national standard completely. Unit product power consumption: steel-making slag powder reaches 30kwh/ ton left and right, slag powders reaches 28kwh/ ton left and right, and iron and steel ground-slag reaches 28-30kwh/t left and right. The comprehensive power consumption of steel-making slag powder reaches 42kwh/ ton left and right, and the comprehensive power consumption of slag powders reaches 40kwh/ ton left and right, and the comprehensive power consumption of iron and steel ground-slag reaches 40-42kwh/ ton left and right
Brief description of the drawings
Fig. 1 is steel-making slag powder production technological process of the present invention.
Fig. 2 is slag processing metal remanufacture process chart.
Fig. 3 is slag powders production technological process of the present invention.
Fig. 4 is iron and steel ground-slag production technological process of the present invention.
Fig. 5 is the merging flow chart of three kinds of production technologies of the present invention.
Detailed description of the invention
As shown in Figure 1, steel-making slag powder production method: the steel slag tailings of the particle diameter≤3mm in slag bank factory building is sent into slag feed bin by crane, be transported to belt conveyor No. 16 by No. 14 belt conveyors again, also can rotate defeated heap belt conveyor by No. 13 the steel slag tailings of the particle diameter≤3mm producing on slag processing metal remanufacture line is delivered directly on No. 16 belt conveyors; The steel slag tailings of particle diameter≤3mm is transported to steel, the main batch bin of slag (now independently slag batch bin of conduct by No. 16 belt conveyors, the secondary batch bin of slag is stopped using), enter constant feeder through threeway scraper-trough conveyer again, after quantitative weighing, deliver to belt conveyor No. 17.
Send into vertical mill by conveying worm again and carry out grinding formation steel-making slag powder, the steel-making slag powder that grinding goes out is divided into qualified steel-making slag powder (being slag micro powder) and steel slag grinding feed back;
Qualified steel-making slag powder is collected by sack cleaner, delivers to bucket elevator No. two by an air conveyer flume, delivers to powder bank top by No. two bucket elevators, and through top, storehouse, No. two air flumes are delivered to steel-making slag powder storehouse; Steel-making slag powder storehouse enters in bulk the dispatching from the factory of bottom of the reservior automobile bulk system by open-type inflatable box.
Steel slag grinding feed back enters No. three self-discharging type electric-magnetic iron removers by No. 18 belt conveyors and carries out a deironing, the slag iron separating is sent into slag iron storehouse, a deironing feed back is sent into a dry powder permanent-magnet drum type magnetic separator and is carried out secondary deironing, the magnetic separation separating is sent into magnetic separation storehouse, secondary deironing feed back is sent into bucket elevator No. one, deliver to vertical mill top, by aerodynamic side threeway scraper-trough conveyer, feed back is sent into oscillating feeder again, through vibrating feed machine vibration cloth, the thickness of feed layer of cloth is less than 20mm, bed of material width is identical with No. two dry powder permanent-magnet drum type magnetic separator magnetic rollers, finally by after three deironing of No. two dry powder permanent-magnet drum type magnetic separators, the another one charging aperture of sending into conveying worm entrance top vertical mill enters vertical mill grinding again, grinding becomes qualified steel-making slag powder, the magnetic separation separating is sent into magnetic separation storehouse.
In the present embodiment, the steel slag tailings that enters steel, the main batch bin of slag is through slag processing metal recycling step, and it comprises: slag crushing, except metal pretreatment close circulation technology, and the pre-grinding of slag, iron removal by magnetic separation close circulation technology. As shown in Figure 2,
Slag crushing, except in metal pretreatment close circulation technology, the screen-aperture of hydraulic overturn sieve is 200mm, the slag of the particle diameter≤200mm filtering out enters to award feed bin, weigh through constant feeder, stable being transported on No. 1 belt conveyor, send hydraulic jaw crusher fragmentation to by No. 2 belt conveyors, controlling discharging particle diameter is≤40mm that the slag after fragmentation is sent into storage bin by No. 3 belt conveyors again; The slag of the > 200mm filtering out adopts quartering hammer coarse crushing, continue screening with entering again hydraulic overturn sieve after magnechuck deironing, the slag of≤200mm enters awards feed bin, so iterative cycles, guarantees to enter in the particle size range of be controlled at≤200mm of slag particle diameter of hydraulic jaw crusher.
In the pre-grinding of slag, iron removal by magnetic separation close circulation technology, process slag crushing, the pretreated slag of deironing in storage bin, stable being transported on No. 4 belt conveyors after constant feeder weighs, carry out pre-grinding by domestic rod mill and reduce slag particle diameter, and the metallic particles and the sticky slag blanket part wrapping on metal that are attached on slag are peeled off; After pre-grinding, carry out deironing by self-unloading type deferrization device, then enter broadband magnetic separator by wide distributing device and carry out iron removal by magnetic separation;
Steel slag tailings after the magnetic separator iron removal by magnetic separation of broadband is delivered to No. two vibratory sieve screenings by No. 8 belt conveyors, this vibratory sieve is comb formula vibratory sieve, and the steel slag tailings of > 3mm is got back to storage bin and carried out pre-grinding to again enter domestic rod mill by No. 9 belt conveyors, No. 3 belt conveyors; The steel slag tailings of≤3mm enters by No. 11 belt conveyors the magnetic separation that the adjustable magnetic separator of single roller selects after iron removal by magnetic separation again and enters magnetic separation storehouse, steel slag tailings is transported to and is rotated for No. 13 on defeated heap belt conveyor by No. 12 belt conveyors, and the steel slag tailings of being sent in slag, slag mixing bank factory building by it stores up district, or rotate defeated heap belt conveyor No. 16 belt conveyors of input and then directly enter milling production line by No. 13;
A vibratory sieve screening is crossed by the slag Tie Tong that broadband magnetic separator iron removal by magnetic separation obtains, and this vibratory sieve is comb formula vibratory sieve, and the slag iron of > 3mm enters slag iron storehouse; The slag Tie Tong of≤3mm crosses No. 10 belt conveyors and is transported to oscillating feeder and enters two roll machine magnetic separation again, separate magnetic separation and steel slag tailings, magnetic separation enters magnetic separation storehouse, steel slag tailings is transported to and is rotated for No. 13 on defeated heap belt conveyor by No. 12 belt conveyors, and the steel slag tailings of being sent in slag, slag mixing bank factory building by it stores up district, or rotate defeated heap belt conveyor by No. 13 and enter No. 16 belt conveyors and then directly enter milling production line;
In the present embodiment, in vertical mill grinding steel-making slag powder step, the parameters of controlling vertical mill is as follows:
Product item title Steel-making slag powder
Grinding roller pressure MPa 12-13
Hearth of hot-blast stove temperature C ° 650-700
Hot blast enters to grind temperature C ° 250-300
Go out to grind temperature C ° 85-90
Powder concentrator rotating speed r/min 110-130
Enter to grind feeding capacity t/h 50
Raw material moisture content % 5-6
Slagging-off iron, magnetic separation amount % 1-2
Production t/h 45
Enter to grind air quantity 104m3/h 20-21
In Vertical Mill process, Real-Time Monitoring vertical mill mill vertical direction and horizontal direction amplitude, if vertical direction amplitude >=2.5mm, when horizontal direction amplitude >=2mm, carries out inside water spray to vertical mill, injection flow rate is at 0.5-2m3/ h, until vertical direction amplitude < 2.5mm, horizontal direction amplitude < 2mm; In Vertical Mill process, the hot blast temperature simultaneously entering in Real-Time Monitoring vertical mill, if inside water spray is carried out to vertical mill in hot blast temperature >=300 ~ 350 DEG C, injection flow rate is at 0.5-2m3/ h, until 300 DEG C of hot blast temperature <.
Vertical mill in the present embodiment is selected the special vertical mill of FRMSG32.3 steel-making slag powder of Xuzhou Fei Huang Heavy Machinery Plant and MCC Central Research Institute of Building and Construction Co., Ltd.'s R & D Cooperation. Rod mill is selected the patent equipment of the total institute of middle smelting building research research and development. Broadband magnetic separator is that Zhenjiang Electromagnetic Equipment Factory Co, Ltd.'s application Beijing Black Warrior science and technology environmental protection Co., Ltd patent cooperation is produced.
Steel-making slag powder production method based on the present embodiment, product yield and comprehensive power consumption technical indicator are as shown in table 1 below:
Table 1
Steel-making slag powder production method based on the present embodiment, the technical indicator of steel-making slag powder is as shown in table 2:
Table 2
Embodiment 2
As shown in Figure 3, slag powders production method: the slag storing in mixing bank factory building, grab after slag feed bin through No. 15 belt conveyors and be transferred to outside mixing bank factory building on No. 16 belt conveyors by 20T driving, carry out a deironing through a self-discharging type electric-magnetic iron remover, after metal detector is surveyed, enter again electricity and surge abrasion-proof scraper-trough conveyer once except without after magnetic metal, through cone shaker, to the slag fragmentation without broken, the mesh size of cone shaker is 80mm, the slag that filters out particle diameter < 80mm enters steel, the main batch bin of slag (now independently Slag Mixture storehouse of conduct, now the secondary batch bin of slag is stopped using), the slag of particle diameter >=80mm is delivered to windrow storehouse from vibratory sieve by-pass line, the broken rear tramp iron separator deironing of using again, slag charge is reuse again, slag iron enters slag iron storehouse, the slag of≤80mm enters steel, the main batch bin of slag, enter constant feeder through threeway scraper-trough conveyer, after quantitative weighing, carried by No. 17 belt conveyors, and by No. two self-discharging type electric-magnetic iron removers again deironing realize after secondary deironing, the another one charging aperture of sending into conveying worm entrance top vertical mill enters vertical mill grinding again, form slag powders, grinding goes out qualified slag powders (being slag micropowder) and slag milling feed back,
Qualified slag powders is collected by air box impulse bag-type dust remover, deliver to bucket elevator No. two by an air conveyer flume, deliver to powder bank top by No. two bucket elevators, through top, storehouse, No. two air flumes are delivered to slag powders storehouse, and slag powders storehouse enters the sale of dispatching from the factory in bulk of bottom of the reservior automobile bulk system by open-type inflatable box;
Slag milling feed back is sent into No. three self-unloading electric magnetic iron removers by No. 18 belt conveyors and is carried out a deironing, slag iron enters slag iron storehouse, feed back after a deironing is sent into a dry powder permanent-magnet drum type magnetic separator and is carried out secondary deironing, the slag iron separating is sent into slag iron storehouse, secondary deironing feed back is sent into bucket elevator No. one, deliver to vertical mill top, by aerodynamic side threeway scraper-trough conveyer, feed back is sent into oscillating feeder again, through vibrating feed machine vibration cloth, the thickness of feed layer of cloth is less than 20mm, bed of material width is identical with No. two dry powder permanent-magnet drum type magnetic separator magnetic rollers, finally by after three deironing of No. two dry powder permanent-magnet drum type magnetic separators, the another one charging aperture that is fed in the defeated machine of helical feed top vertical mill enters vertical mill grinding again, grinding becomes qualified slag powders, the slag iron separating is sent into slag iron storehouse.
In the present embodiment, in vertical mill grinding slag powders step, the parameters of controlling vertical mill is as follows:
Product item title Slag powders
Grinding roller pressure MPa 12-13
Hearth of hot-blast stove temperature C ° 800-900
Hot blast enters to grind temperature C ° 300-350
Go out to grind temperature C ° 85-95
Powder concentrator rotating speed r/min 110-140
Enter to grind feeding capacity t/h 68
Production t/h 60
Raw material moisture content % 8-12
Slagging-off iron amount % 0.15
Enter to grind air quantity 104m3/h 20-22
In Vertical Mill process, Real-Time Monitoring vertical mill mill vertical direction and horizontal direction amplitude, if vertical direction amplitude > is 2.5mm, when horizontal direction amplitude > 2mm, vertical mill is carried out to inside water spray, injection flow rate is at 0.5-2m3/ h, until vertical direction amplitude < 2.5mm, horizontal direction amplitude < 2mm; In Vertical Mill process, the hot blast temperature that simultaneously Real-Time Monitoring vertical mill enters, if 350 DEG C of hot blast temperature > carry out inside to vertical mill and spray water, injection flow rate is at 0.5-2m3/ h, until 350 DEG C of temperature <.
The present embodiment vertical mill is selected the special vertical mill of FRMSG32.3 steel-making slag powder of Xuzhou Fei Huang Heavy Machinery Plant and MCC Central Research Institute of Building and Construction Co., Ltd.'s R & D Cooperation.
Slag powders production method based on the present embodiment, product yield and comprehensive power consumption are as shown in table 3 below:
Table 3
Slag powders production method based on the present embodiment, slag powders technical indicator is as shown in table 4 below:
Table 4
Adopt vertical mill grinding and other grinding machine grinding steel-making slag powder power consumptions to be compared as follows shown in table 5 for embodiment 1 and 2:
Table 5
Embodiment 3
As shown in Figure 4, steel slag powder producing method: carry out the recycling of slag processing metal to entering the steel slag tailings of vertical mill first respectively, carry out slag except metal pretreatment to entering the slag of vertical mill. Its concrete steps, as above-described embodiment one and embodiment bis-, repeat no more here.
Send into slag feed bin and enter No. 19 belt conveyors and send the secondary batch bin of slag to being stored in steel slag tailings crane grab in slag bank factory building, delivered on No. 17 belt conveyors by No. two constant feeders, slag is sent on No. 17 belt conveyors by a constant feeder from steel, the main batch bin of slag. Through No. two self-discharging type electric-magnetic iron removers slag of deironing again, and enter vertical mill and carry out grinding and form iron and steel ground-slag in together sending into conveying worm by No. 17 belt conveyors after the ratio proportioning of slag and slag component 2~4:8~6, the iron and steel ground-slag that grinding goes out is divided into qualified iron and steel ground-slag (being steel slag micro mist) and steel slag grinding feed back;
Above-mentioned steel slag tailings and slag are before entering conveying worm, above No. 17 belt conveyors, after No. two self-discharging type electric-magnetic iron removers, the enhancing grinding aid of spray 0.1%wt-0.15%wt, this enhancing grinding aid adopts the enhancing grinding aid of Shanghai Ai Si get Rui building materials Co., Ltd, its name of product model: smartv8-A.
Qualified iron and steel ground-slag is collected by sack cleaner, delivers to bucket elevator No. two by an air conveyer flume, delivers to powder bank top by No. two bucket elevators, and through top, storehouse, No. two air flumes are delivered to iron and steel ground-slag storehouse; Iron and steel ground-slag storehouse enters in bulk the dispatching from the factory of bottom of the reservior automobile bulk system by open-type inflatable box.
By vertical mill grinding iron and steel ground-slag step and vertical mill steel slag grinding feed back iron removal by magnetic separation closed cycle step, realize vertical mill grinding steel slag powder craft again.
In vertical mill grinding iron and steel ground-slag process, control the grinding roller pressure of vertical mill at 12-13MPa, hot blast enters vertical mill temperature 300-350 DEG C, and air quantity is at 20*104-22*104m3/ h, hot blast goes out vertical mill temperature 85-95 DEG C, and the powder concentrator rotating speed of vertical mill is at 110-140r/min.
In vertical mill grinding iron and steel ground-slag process, Real-Time Monitoring vertical mill mill vertical direction and horizontal direction amplitude, if vertical direction amplitude > is 2.5mm, when horizontal direction amplitude > 2mm, vertical mill is carried out to inside water spray, injection flow rate is at 0.5-2m3/ h, until vertical direction amplitude < 2.5mm, horizontal direction amplitude < 2mm; In Vertical Mill process, the hot blast temperature simultaneously entering in Real-Time Monitoring vertical mill, at slag with slag component ratio at 1/4 ~ 1/2 o'clock, if 350 DEG C of hot blast temperature > entering will carry out inside to vertical mill and spray water, injection flow rate is at 0.5-2m3/ h, until 350 DEG C of temperature <. At slag and slag component ratio, at 1/2 ~ 2/3 o'clock, if 330 DEG C of hot blast temperature > entering will carry out inside water spray to vertical mill, injection flow rate was at 0.5-2m3/ h, until 330 DEG C of temperature <.
Meanwhile, adjust vertical mill internal structure: the lining board for grinding discs angle of vertical mill is 3 °, and the angle of roller shell axis and horizontal plane is 15 °, and mill and the grinding roller nip angle in the time milling is 5-6 °. In the present embodiment, in vertical mill grinding iron and steel ground-slag step, the parameters of controlling vertical mill is as follows:
Table 6
Steel slag powder producing method based on the present embodiment, its technical indicator is as shown in the table:
Table 7
In the present embodiment, the steel slag powder yield of production reaches 52-58t/h, and iron and steel ground-slag specific area > 460 ㎡/kg, meets national standard completely. Unit product power consumption: iron and steel ground-slag reaches 28-30kwh/t left and right, the comprehensive power consumption of iron and steel ground-slag reaches 40-42kwh/ ton left and right.

Claims (17)

1. a production method for vertical mill grinding iron and steel ground-slag, is characterized in that: vertical mill grinding steel slag powder craft comprises the following steps,
Vertical mill grinding iron and steel ground-slag step: the slag that the steel slag tailings obtaining through slag processing metal recycling step and slag obtain except metal pretreatment step, carried by conveyer respectively, slag is sent into steel, the main batch bin of slag, steel slag tailings and is sent into the secondary batch bin of slag; And constant feeder by separately enters conveying worm after spraying the grinding aid reinforcing agent of 0.1%wt-0.15%wt after in the ratio proportioning of slag and slag component 2~4:8~6, send into the direct grinding of vertical mill by conveying worm again, control the grinding roller pressure of vertical mill at 12-13MPa, hot blast enters vertical mill temperature 300-350 DEG C, and air quantity is at 20*104-22*104m3/ h, hot blast goes out vertical mill temperature 85-95 DEG C, and the powder concentrator rotating speed of vertical mill, at 110-140r/min, obtains qualified iron and steel ground-slag and underproof steel slag grinding feed back;
Vertical mill steel slag grinding feed back iron removal by magnetic separation closed cycle step: steel slag grinding feed back is successively through No. three self-discharging type electric-magnetic iron removers, a dry powder permanent-magnet drum type magnetic separator iron removal by magnetic separation, deliver to vertical mill top by an elevator again, through vibrating feed machine vibration cloth, the thickness of feed layer of cloth is less than 20mm, bed of material width is identical with No. two dry powder permanent-magnet drum type magnetic separator magnetic rollers, enter No. two dry powder permanent-magnet drum type magnetic separators again after iron removal by magnetic separation, the another one charging aperture of sending into conveying worm entrance top vertical mill enters vertical mill grinding again.
2. the production method of vertical mill grinding iron and steel ground-slag according to claim 1, is characterized in that:
In vertical mill grinding iron and steel ground-slag process, Real-Time Monitoring vertical mill mill vertical direction and horizontal direction amplitude, if vertical direction amplitude > is 2.5mm, when horizontal direction amplitude > 2mm, vertical mill is carried out to inside water spray, injection flow rate is at 0.5-2m3/ h, until vertical direction amplitude < 2.5mm, horizontal direction amplitude < 2mm; In Vertical Mill process, the hot blast temperature simultaneously entering in Real-Time Monitoring vertical mill, at slag with slag component ratio at 1/4 ~ 1/2 o'clock, if 350 DEG C of hot blast temperature > entering will carry out inside to vertical mill and spray water, injection flow rate is at 0.5-2m3/ h, until 350 DEG C of temperature <.
3. the production method of vertical mill grinding iron and steel ground-slag according to claim 2, is characterized in that:
At slag and slag component ratio, at 1/2 ~ 2/3 o'clock, if 330 DEG C of hot blast temperature > entering will carry out inside water spray to vertical mill, injection flow rate was at 0.5-2m3/ h, until 330 DEG C of temperature <.
4. according to the production method of the vertical mill grinding iron and steel ground-slag described in claim 1-3 any one, it is characterized in that:
Deduster delivered to by qualified iron and steel ground-slag by powder concentrator in vertical mill, collects by deduster; The iron and steel ground-slag that described deduster is collected is sent into elevator No. two by an air conveyer flume, delivers to top, powder storehouse by No. two elevators; Iron and steel ground-slag is delivered to corresponding iron and steel ground-slag storehouse by automatic tee valve by No. two air conveyer flumes in top, powder storehouse.
5. the production method of vertical mill grinding iron and steel ground-slag according to claim 4, is characterized in that:
Described deduster is air box impulse bag-type dust remover; Thermal current is delivered to chimney by the main exhaust fan of described air box impulse bag-type dust remover, enters vertical mill together with after the thermal current that in chimney, the thermal current circulation loopback of large portion is sent with hot-blast stove is mixed, remainder by smoke stack emission in atmosphere.
6. according to the production method of the vertical mill grinding iron and steel ground-slag described in any one in claim 1-3, it is characterized in that:
The lining board for grinding discs inclined angle of described vertical mill is 3 °, and mill and the grinding roller nip angle in the time milling is 5-6 °.
7. the production method of vertical mill grinding iron and steel ground-slag according to claim 6, is characterized in that:
Described conveyer is belt conveyor.
8. a production method for vertical mill grinding slag powders, is characterized in that: vertical mill grinding slag powders technique comprises the following steps,
Slag removes metal pretreatment step: the slag storing in slag bank factory building is sent into slag feed bin by crane, carried by conveyer, and carry out deironing, after without magnetic metal, enter vibratory sieve through self-discharging type electric-magnetic iron remover, a metal detector, the slag that is less than Vibration Screen screen distance enters steel, the main batch bin of slag, deliver to conveyer through constant feeder, by No. two self-discharging type electric-magnetic iron remover deironing again;
Vertical mill grinding slag powders step: slag is through except after metal pretreatment, then deliver into the direct grinding of vertical mill by conveying worm, obtain qualified slag micropowder and underproof slag milling feed back;
Vertical mill slag milling feed back iron removal by magnetic separation closed cycle step: slag milling feed back is successively through No. three self-discharging type electric-magnetic iron removers, a dry powder permanent-magnet drum type magnetic separator iron removal by magnetic separation, deliver to vertical mill top by an elevator again, through vibrating feed machine vibration cloth, the thickness of feed layer of cloth is less than 20mm, bed of material width is identical with No. two dry powder permanent-magnet drum type magnetic separator magnetic rollers, enter No. two dry powder permanent-magnet drum type magnetic separators again after iron removal by magnetic separation, the another one charging aperture of sending into conveying worm entrance top vertical mill enters vertical mill grinding again.
9. the production method of vertical mill grinding slag powders according to claim 8, is characterized in that:
Qualified slag powders is delivered to deduster by powder concentrator in vertical mill, collects by deduster; The slag powders that described deduster is collected is sent into elevator No. two by an air conveyer flume, delivers to top, powder storehouse by No. two elevators; Slag powders is delivered to corresponding slag powders storehouse by automatic tee valve by No. two air conveyer flumes in top, powder storehouse.
10. the production method of vertical mill grinding slag powders according to claim 9, is characterized in that:
Described deduster is air box impulse bag-type dust remover; Thermal current is delivered to chimney by the main exhaust fan of described air box impulse bag-type dust remover, enters vertical mill together with after the thermal current that in chimney, the thermal current circulation loopback of large portion is sent with hot-blast stove is mixed, remainder by smoke stack emission in atmosphere.
The production method of the vertical mill grinding slag powders described in 11. according to Claim 8-10 any one, is characterized in that:
The lining board for grinding discs inclined angle of described vertical mill is 3 °, and mill and the grinding roller nip angle in the time milling is 5-6 °.
The production method of 12. vertical mill grinding slag powders according to claim 11, is characterized in that:
Described conveyer is belt conveyor.
The production method of 13. 1 kinds of vertical mill grinding steel-making slag powder, is characterized in that: vertical mill grinding steel-making slag powder technique comprises the following steps,
Slag processing metal recycling step: comprise slag crushing, deironing pretreatment close circulation technology, and the pre-grinding of slag, iron removal by magnetic separation close circulation technology; In slag crushing, deironing pretreatment close circulation technology, slag is first through the screening of hydraulic overturn sieve, and the slag that is less than hydraulic overturn sieve mesh size enters to award feed bin, stable being transported on conveyer after constant feeder weighs, send hydraulic jaw crusher fragmentation to, after fragmentation, can send into storage bin; Be greater than the slag quartering hammer coarse crushing of hydraulic overturn sieve mesh size, again enter the screening of hydraulic overturn sieve after magnechuck deironing, so iterative cycles, guarantees to enter the slag particle diameter of awarding feed bin and is controlled at and is less than in the pore diameter range that hydraulic overturn sieves screen cloth; In the pre-grinding of slag, iron removal by magnetic separation close circulation technology, process slag crushing, the pretreated slag of deironing in storage bin, stable being transported on conveyer after constant feeder weighs, carry out pre-grinding by domestic rod mill and reduce slag particle diameter, and the metallic particles and the sticky slag blanket part wrapping on metal that are attached on slag are peeled off; After pre-grinding, carry out deironing by self-unloading type deferrization device, then enter broadband magnetic separator by wide distributing device and carry out iron removal by magnetic separation; Steel slag tailings after the magnetic separator iron removal by magnetic separation of broadband is by the screening of No. two vibratory sieves, and the steel slag tailings that is greater than No. two Vibration Screen screen distances is got back to storage bin and carried out pre-grinding to again enter domestic rod mill; The steel slag tailings that is less than No. two Vibration Screen screen distances is sent into the steel slag tailings that the adjustable magnetic separator of single roller sends in slag, slag mixing bank factory building after iron removal by magnetic separation again and is stored up district, or directly enters milling production line;
Vertical mill grinding steel-making slag powder step: by the steel slag tailings obtaining in slag processing metal recycling step, directly send into steel, the main batch bin of slag by the defeated heap conveyer of rotation, or the steel slag tailings storing in steel, slag mixing bank factory building is sent into slag feed bin by crane, then send into steel, the main batch bin of slag by conveyer; After constant feeder is delivered to conveyer, enter conveying worm, enter the direct grinding of vertical mill, obtain qualified slag micro powder and underproof steel slag grinding feed back;
Vertical mill steel slag grinding feed back iron removal by magnetic separation closed cycle step: steel slag grinding feed back is successively through No. three self-discharging type electric-magnetic iron removers, a dry powder permanent-magnet drum type magnetic separator iron removal by magnetic separation, deliver to vertical mill top by an elevator again, through vibrating feed machine vibration cloth, the thickness of feed layer of cloth is less than 20mm, bed of material width is identical with No. two dry powder permanent-magnet drum type magnetic separator magnetic rollers, enter No. two dry powder permanent-magnet drum type magnetic separators again after iron removal by magnetic separation, the another one charging aperture of sending into conveying worm entrance top vertical mill enters vertical mill grinding again.
The production method of 14. vertical mill grinding steel-making slag powder according to claim 13, is characterized in that:
Qualified steel-making slag powder is delivered to deduster by powder concentrator in vertical mill, collects by deduster; The steel-making slag powder that described deduster is collected is sent into elevator No. two by an air conveyer flume, delivers to top, powder storehouse by No. two elevators; Steel-making slag powder is delivered to corresponding steel-making slag powder storehouse by automatic tee valve by No. two air conveyer flumes in top, powder storehouse.
The production method of 15. vertical mill grinding steel-making slag powder according to claim 14, is characterized in that:
Described deduster is air box impulse bag-type dust remover; Thermal current is delivered to chimney by the main exhaust fan of described air box impulse bag-type dust remover, enters vertical mill together with after the thermal current that in chimney, the thermal current circulation loopback of large portion is sent with hot-blast stove is mixed, remainder by smoke stack emission in atmosphere.
16. according to the production method of the vertical mill grinding steel-making slag powder described in claim 13-15 any one, it is characterized in that:
The lining board for grinding discs inclined angle of described vertical mill is 3 °, and mill and the grinding roller nip angle in the time milling is 5-6 °.
The production method of 17. vertical mill grinding steel-making slag powder according to claim 16, is characterized in that:
Described conveyer is belt conveyor.
CN201410378735.8A 2014-06-13 2014-08-04 The production method of vertical mill grinding iron and steel ground-slag, slag powders and steel-making slag powder CN104291714B (en)

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CN105214781A (en) * 2015-09-18 2016-01-06 江苏融达新材料股份有限公司 A kind of production method of vertical mill grinding ferronickel ground-slag
CN105217975A (en) * 2015-09-18 2016-01-06 江苏融达新材料股份有限公司 The production method of a kind of vertical mill grinding ferronickel slag, slag composite powder
CN105214780A (en) * 2015-09-18 2016-01-06 江苏融达新材料股份有限公司 A kind of production method of vertical mill grinding lithium ground-slag
CN105195268A (en) * 2015-09-18 2015-12-30 江苏融达新材料股份有限公司 Production method for grinding lithium slag and mineral slag composite powder by means of vertical grinding machine
CN105396673A (en) * 2015-09-18 2016-03-16 江苏融达新材料股份有限公司 Method for producing grinding nickel-iron slag and steel slag composite powder through grinding by using vertical mill
CN106076575A (en) * 2016-07-01 2016-11-09 江苏融达新材料股份有限公司 A kind of production method of superfine steel slag micropowder
CN107382116B (en) * 2017-08-31 2019-10-18 盐城工学院 A kind of high activity modified steel-making slag powder and its invariability treatment method
CN107954622A (en) * 2017-11-17 2018-04-24 江苏融达新材料股份有限公司 A kind of production method of flyash, slag composite powder
CN108033702A (en) * 2017-11-17 2018-05-15 江苏融达新材料股份有限公司 A kind of production method of flyash, steel slag composite powder
CN107694335A (en) * 2017-11-22 2018-02-16 中国科学院过程工程研究所 A kind of metallurgical gas purifying treatment method
CN108238731A (en) * 2018-03-14 2018-07-03 北海诚德镍业有限公司 The ultrafine slag powder and its preparation system and method for a kind of blast furnace ferronickel slag manufacture

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