CN114939591A - Dry separation process for stainless steel slag - Google Patents
Dry separation process for stainless steel slag Download PDFInfo
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- CN114939591A CN114939591A CN202110215558.1A CN202110215558A CN114939591A CN 114939591 A CN114939591 A CN 114939591A CN 202110215558 A CN202110215558 A CN 202110215558A CN 114939591 A CN114939591 A CN 114939591A
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- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 54
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- 238000000926 separation method Methods 0.000 title claims description 51
- 239000000843 powder Substances 0.000 claims abstract description 196
- 238000001816 cooling Methods 0.000 claims abstract description 178
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 129
- 239000010959 steel Substances 0.000 claims abstract description 129
- 230000018199 S phase Effects 0.000 claims abstract description 70
- 239000000463 material Substances 0.000 claims abstract description 68
- 238000010583 slow cooling Methods 0.000 claims abstract description 65
- 238000000034 method Methods 0.000 claims abstract description 60
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- 238000010298 pulverizing process Methods 0.000 claims abstract description 13
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- 239000000523 sample Substances 0.000 claims description 6
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
- C21B3/08—Cooling slag
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
- C21B2400/022—Methods of cooling or quenching molten slag
- C21B2400/024—Methods of cooling or quenching molten slag with the direct use of steam or liquid coolants, e.g. water
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
- C21B2400/022—Methods of cooling or quenching molten slag
- C21B2400/026—Methods of cooling or quenching molten slag using air, inert gases or removable conductive bodies
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/05—Apparatus features
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Furnace Details (AREA)
Abstract
The invention discloses a dry sorting process for stainless steel slag, which comprises four process sections of jaw crushing of stainless steel molten slag, ball-milling sorting of electric furnace slag, dry quick-cooling ball-milling sorting of AOD slag and dry balanced cooling slow-cooling pulverization sorting of AOD slag, wherein products of ball-milling sorting of electric furnace slag are steel block, fine steel powder and fine electric furnace slag powder, and products of dry quick-cooling ball-milling sorting of AOD slag are steel blockGrain steel, refined steel powder and beta-C 2 The products of S phase fine slag powder, AOD slag dry method equilibrium cooling pulverization sorting are steel block, steel fine powder and gamma-C 2 S phase fine slag powder, steel block steel particles are returned to steel making for recycling, steel fine powder is used as sintering raw material, and electric furnace slag fine powder and gamma-C are used 2 S phase fine slag powder, beta-C 2 The S-phase fine slag powder is matched as an auxiliary material for producing cement, the process is suitable for sorting various stainless steel slag systems, the sorting process is safe and environment-friendly, the metal yield is high, the metal material is clean, and the resource utilization degree of the slag powder is high.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of stainless steel slag sorting, in particular to a stainless steel slag dry sorting process.
[ background of the invention ]
China is a big country for stainless steel production, and the slag yield of stainless steel accounts for about 30 percent of the steel yield, wherein electricity is usedThe furnace steel slag is blocky after being cooled and granular after being crushed, the AOD steel slag has the characteristic of natural pulverization after being cooled, the slag contains more stainless steel metal due to deslagging operation, ladle residue injection and the like, the part of metal exists in two different states, firstly, the large ladle residue injection and the large metal generated in the deslagging operation process exist, secondly, metal liquid drops generated by mixing the steel slag are solidified into small metal particles in the slag, the purpose of processing the stainless steel slag is to separate the metal and the slag, and the metal and the tailings can be recycled. The prior treatment process of the stainless steel slag can be summarized as dry treatment, namely, the hot stainless steel slag is pulverized by water and then is mechanically screened, large cast residual steel with irregular shape is hoisted out for mechanical segmentation in the screening and feeding process, 200 series stainless steel and 400 series stainless steel have magnetism, the screened residual steel is crushed and magnetically separated to separate out slag steel and granular steel, metal materials in the screened residual slag are magnetically separated by a dry magnetic separator to be called magnetic separation powder, 300 series stainless steel have no magnetism, the slag steel is separated out by manual selection and then is crushed and separated from the screened residual slag by a water separation mode to separate out granular steel and steel fine powder, the tail mud is subjected to filter pressing and dehydration, the slag steel and the granular steel are returned to steelmaking cycle for recycling, the magnetic separation powder or the steel fine powder is used for sintering and batching, and the tail slag is mostly used for slag micro powder batching. The defects of the process are shown in the following aspects: firstly, the hot slag is pulverized by water beating, dust overflow can be generated in different degrees no matter the hot slag tank is watered, the slag disintegrating pool is watered or the hot slag pile is watered, the operation environment in a factory is severe, wherein the dust overflow is the most serious when the hot slag pile is watered and the pipe is inserted for water beating; secondly, the pulverized slag can raise dust again in the process of sequence conversion and sorting, and the environment is polluted; thirdly, the large cast residual steel sheet and the cast residual steel lump can be put into a furnace after being broken into qualified blocks, the breaking operation efficiency is low, and the danger coefficient is high; fourthly, most of the stainless steel slag pulverized by water treatment is uneven in dryness and wetness, the average water content is basically 8-12%, the slag steel, the grain steel and the magnetic separation powder which are separated out have large slag adhering amount, and can be recycled only by dry grinding or water grinding selection, so that the treatment process is prolonged, and the field environment is further polluted; fifthly, because 300 series stainless steel is magnetized, the magnetic separation method is limited for separating 300 series metal materials, a jigger, a spiral classifier and a table concentrator which take water as a medium are adopted for separating granular steel and fine powder,some methods adopt metal induction separation, so a treatment line needs to be additionally arranged on the 300 series stainless steel slag, and the cost is increased; sixthly, the main phase of the AOD steel slag is 2CaO SiO 2 ，C 2 S can generate crystal form transformation in the process of cooling, and one of the S is that liquid phase slag and alpha-C occur at 2130 DEG C 2 Reversible transformation of S, alpha-C at 1420 ℃ 2 S and alpha' H -C 2 Reversible transformation of S, alpha 'occurring at 1160℃' H -C 2 S and alpha' L -C 2 Reversible transformation of S, which is expressed as alpha 'at 725 ℃ under the condition of equilibrium cooling' L -C 2 S and gamma-C 2 Reversible transformation of S, three of which appear as alpha 'occurring at about 670 ℃ under rapid supercooling' L -C 2 S and beta-C 2 Reversible transformation of S, whereas beta-C 2 S is a metastable state which is unidirectionally converted to gamma-C at 525 DEG C 2 S, due to alpha' L -C 2 S、β-C 2 S、γ-C 2 Density of S (g/cm) 3 ) Are respectively 3.14, 3.20 and 2.94 with larger phase difference of alpha' L -C 2 S、β-C 2 Conversion of S to gamma-C 2 S all undergo volume expansion and thus undergo pulverization, wherein beta-C 2 S one-way transformation of gamma-C 2 S volume expansion of about 12%, beta-C 2 S has gelling property and gamma-C 2 S phase slag non-gelling, beta-C 2 The value of S phase slag is far greater than gamma-C 2 S phase slag, therefore, the treatment of stainless steel slag hopefully obtains beta-C under the condition of quick supercooling 2 S phase slag and rapid cooling spanning beta-C 2 S substance is opposite to gamma-C 2 The phase transition temperature of S phase unidirectional transformation makes beta-C 2 S phase slag is maintained, and the adjustable and controllable cooling temperature becomes a necessary precondition.
[ summary of the invention ]
The invention aims to change the problems of serious dust raising of hot slag and water tight overflow dust, high water content of the water tight slag, high danger of large steel breaking operation, dry separation impurity removal or water separation impurity removal of magnetically separated stainless steel metal materials due to serious slag adhesion, and non-magnetic property and combination of wet and wet requirements of metal materials in 300 series stainless steel slag in the prior stainless steel slag dry treatment processThe metal materials separated by the method treatment process and the tailings are collected by adopting a filter pressing mode, the water consumption is large, the investment is high, the operation cost is high, and the phase of the slag powder obtained by the single balanced cooling slow cooling pulverization process is gamma-C 2 S, and gamma-C 2 The S-phase slag powder has no gelatinization, the added value in the production of portland cement is greatly influenced, and the like, and the dry separation process for the stainless steel slag is provided, so that the safe, environment-friendly and efficient separation treatment operation of the stainless steel slag is realized.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the stainless steel slag dry separation process comprises four process sections, namely die casting crushing of liquid slag, dry separation of electric furnace crushing slag, dry balanced cooling slow cooling separation of AOD crushing slag and dry rapid cooling separation of AOD crushing slag; wherein, the liquid slag die casting crushing process comprises the following steps: adding water into stainless steel slag powder, stirring in a stirrer to prepare slag mud, pouring the slag mud on a die lug in a tail slag die side wall surrounding wall pouring section of a casting machine in the running state of a slag casting machine, forming a slag die side wall surrounding wall in a slag die side wall surrounding weir pouring baffle gap, spraying demolding slurry on the surface of a slag die in a slag die slurry spraying section by a slurry spraying device, tipping slag pot molten slag on a slag pot support platform, uniformly flowing into a slag die of a slag casting section by a slag pot tipping device, passing through a shower section, accelerating, cooling, crusting and solidifying, demolding and breaking a solidified slag block head into a first jaw crusher port, vibrating a slag mould vibrator of the slag casting machine, vibrating and dropping undeveloped slag blocks into a returning groove by a slag vibrator of the slag casting machine, driving demolding slag of the slag machine to be broken into a first jaw crusher port from a slag discharging port of the slag crusher by a slag vibrator of the slag crusher, sieving out massive steel by a linear vibration sieve, and breaking slag in a second jaw crusher by a second jaw crusher, an environment dust hood is arranged at the machine opening of the jaw crusher, dust enters a dust collector of a slow cooling chamber, and crushed slag enters a subsequent dry separation process section; the dry separation process of the electric furnace crushed slag comprises the following steps: piling broken slag of an electric furnace broken by a two-stage jaw crusher, then feeding the broken slag in batches into a closed tubular ball crusher, feeding the broken slag into the tubular ball crusher, crushing the broken slag, separating small steel and granular steel from ground crushed slag by a vibrating screen, intensively piling the crushed slag under the screen, grinding the crushed slag in a staggered time, and feeding the crushed slag into a pipe in batchesThe steel is recycled by steel making, the steel fine powder is used as a sintering raw material, and the electric furnace slag fine powder is used as an auxiliary material for producing cement; the dry balanced cooling and slow cooling separation process of the AOD crushed slag comprises the following steps: the AOD broken slag crushed by the second-level jaw crusher is lifted to the top layer of a slow cooling chamber of a cooling tower by a slow cooling chamber chain plate bucket elevator for slag discharge, slag blocks slide into the tail end of a cooling bed at the uppermost layer of the slow cooling chamber along a material distribution chute, the slag blocks are transversely distributed and expanded in a downward sliding process of the chute surface and are uniformly paved on the cooling bed, a slag block temperature measuring system, an infrared probe aiming material bed and an electronic processing unit are arranged on a steel structure frame at the tail end of each cooling bed, the slag blocks are balanced and cooled gradually under the action of negative pressure in the tower formed by a cold water spraying cooling device with adjustable flow and a dust collector exhaust fan in the operation process, and the balance and cooling are gradually converted into gamma-C 2 S phase slag is pulverized, the slag powder reaching the head end of the bed falls on the surface of a bed head vibrating screen for screening, and the screened slag powder falls into gamma-C 2 S-phase slag powder descending pipeline enters a slag powder bin of a slow cooling chamber, the slag on the sieve is uniformly paved on the next layer of cooling bed by a material distributing chute, the temperature is continuously reduced by the combined action of cold water spraying and cooling and negative pressure air draft and cold air cooling in the tower in the operation process, the slag powder reaching the head end of the bed is gradually pulverized from the outside to the inside, the slag powder falls on the vibrating screen surface of the bed head for sieving, and the slag powder under the sieve falls into gamma-C 2 S-phase slag powder descending pipeline enters a slag powder bin of a slow cooling chamber, slag blocks on a screen are uniformly paved on a next layer of cooling bed through a material distribution chute in a circulating reciprocating manner, the slag blocks are completely pulverized through the ventilation quantity in a slag temperature control tower at the head of each layer of cooling bed, the total flow of a cold water spraying system and the cold water spraying distribution quantity of each layer of cooling bed, which are measured by a slag block temperature measuring system, the oversize products are residual clean metal blocks after being screened by a vibrating screen at the tail end, the oversize products are led out from the lowest layer of cooling bed, are conveyed to a steel block steel compartment in a material collection chamber through a metal block leading-out pipeline of the slow cooling chamber in a fixed quantity clearing manner, and coarse slag powder settled and descending in the slow cooling chamber is collected in a slag powder bin of the slow cooling chamber at the tower belly and is stranded by a tubular auger conveyor to gamma-C 2 S phase slag powder chainA plate bucket type lifter, which is lifted to gamma-C 2 Sorting S-phase slag powder by a powder sorting machine, collecting steel fine powder into a fine powder bin and gamma-C by a coarse medium powder collecting cone 2 Collecting S phase slag powder into gamma-C 2 S final slag bin, gamma-C ascending along with indoor negative pressure 2 S-phase fine slag powder is collected by a dust collector of a tower top slow cooling chamber and is conveyed to gamma-C outside the tower through a descending pipeline 2 S final slag bin, steel blocks and steel granules are returned to steel making for cyclic utilization, steel fine powder is used as sintering raw material for proportioning, and gamma-C 2 S phase fine slag powder is used as an auxiliary material for producing cement; the dry rapid cooling quenching separation process of the AOD crushed slag comprises the following steps: the AOD broken slag broken by the secondary jaw crusher is lifted to the top layer of a quenching chamber of a cooling tower by a quenching chamber chain plate bucket elevator for slag discharge, slag blocks slide into the tail end of the uppermost layer of a quenching chamber cooling bed along a quenching chamber material distribution chute, the slag blocks are transversely distributed and expanded and uniformly tiled on the cooling bed in the sliding process of the chute surface, the temperature is continuously reduced under the sweeping action of strong cold air of a cooling bed air cooling system pipeline at the bottom of the cooling bed in the operation process, the slag blocks reaching the head end of the cooling bed fall on a material pouring chute at the head of a bed and then slide into and uniformly tiled on the next layer of cooling bed, and the operation is repeated in a circulating way, a slag block temperature measuring system, an infrared probe aiming at the material bed and an electronic processing unit are arranged outside the tower on a steel structure frame at the tail end of each layer of the cooling bed, and the rapid temperature reduction of the slag blocks and the rapid crossing of gamma-C are realized by regulating and controlling the grain size of the secondary jaw broken slag and the blast strength of each layer of the material bed 2 Phase transition temperature of S is fixed to beta-C 2 S phase slag is separated, quenched slag is led out by a lowermost layer cold bed to be arranged in a closed tubular ball crusher through a chute and then enters a feeding belt of the closed tubular ball crusher to be crushed, coarse slag powder descending in a quenching chamber is gathered in a slag powder bin of a tower abdomen quenching chamber and then is twisted out by a tubular auger conveyor and then is fed into the closed tubular ball crusher to be crushed through the feeding belt of the closed tubular ball crusher, small steel blocks and granular steel are separated from crushed material which is discharged through a vibrating screen, crushed slag which is sieved off is fed into a tubular ball mill to be ground, and ground material is subjected to beta-C grinding 2 Feeding S-phase slag powder into beta-C by chain plate bucket elevator 2 Sorting by S-phase slag powder sorting machine, collecting refined steel powder into refined powder bin and beta-C powder bin by coarse and medium powder collecting cone 2 The S phase slag powder is collected by fine powder and is tapered into beta-C 2 S final slag bin, which is carried along with exhaust fan of dust collector of tower top quenching chamber for air suction and dust collectionThe fine slag powder is gamma-C pulverized by cooling 2 S phase slag powder with small quantity is collected by a dust collector of a quenching chamber at the top of the tower and then is conveyed to gamma-C outside the tower through a descending pipeline 2 S, a final slag bin; the steel blocks and the steel granules are returned to the steel making for recycling, the steel fine powder is used as the sintering raw material, and the gamma-C 2 S phase, beta-C 2 The S phase fine slag powder is used as an auxiliary material for producing cement.
The invention relates to a slag casting machine, which is continuous die casting equipment for casting liquid steel slag into slag blocks and consists of a concrete upper horizontal frame, a machine head speed reducer, a machine head driving star-shaped gear, a machine tail driven star-shaped gear, a fixed chain wheel, a chain, a slag mold, a machine head slag mold side wall enclosing wall, a slag mold side wall enclosing weir pouring device, a slag mold slurry spraying device, a slag tank tipping device, a slag casting mold shower device, a belly slag casting mold rapping device, a concrete lower horizontal frame and a belly demolding slag returning device; the slag mold is characterized in that: the slag mold is made of a cast steel mold, the cross section of the slag mold is in a concave arc shape, the inner concave surface containing cavity is in a horizontal semi-cylindrical shape, two ends of the inner concave surface containing cavity are opened, the contact surface between the casting slag and the slag mold is reduced, the demolding is easy to realize, the bottom surface of the slag mold extends outwards to form cuboid mold lugs, a pair of screw holes are respectively formed in the horizontal planes of the mold lugs at two sides, and the slag mold is fixed on a chain; the slag mould side wall cofferdam pouring device is characterized in that: a pair of vertical parallel baffles fixed on a horizontal rack on concrete are arranged on the two sides of a plurality of rows of slag moulds from a tail end pouring section to a slag casting section and on a mould lug plane, the height of each baffle is equal to that of the slag mould, the baffle is long outside and short inside, a gap is reserved between each baffle and the mould lug plane, stainless steel slag powder and water are added into a stirrer and uniformly stirred to form slag mud, the water content of the slag mud is controlled to be limited by that the slag weir does not naturally collapse, two grouting gun heads of a grouting machine are respectively inserted into the gap of the baffles, the flow rate of the grouting is adjusted according to the advancing speed of the slag mould, the cavity of the baffles is limited by that the slag mud is fully poured, a cofferdam is formed on the side wall of the slag mould after the slag mud is poured in the space between the baffles, the cofferdams on the two sides are seated, and openings at the two ends of the slag mould are sealed; the slag mold spraying demolding slurry is characterized in that: the demoulding slurry takes raw vermiculite powder as a main material, blast furnace cloth bag dedusting ash as an auxiliary material, water is added for dilution and stirring to form slurry, the raw vermiculite powder in the slurry expands due to heating of high-temperature slag to form a separation interface between a slag block and a slag mold, and the slag block falls off from the slag mold under the action of self gravity and vibration in the process of returning to a machine head; the device for rapping and returning the demolded slag of the belly slag casting die is characterized in that: set up the rapping apparatus frame in the belly position that is close to frame on the aircraft nose, the rapping apparatus base is fixed with bolt-up's steel sheet, the rapping apparatus is invertd the pendant and is in the frame lower extreme, the vertical both ends of rapping apparatus base steel sheet are bent downwards, the sediment mould of casting that returns is taken and is walked on rapping apparatus base steel sheet, the rapping apparatus shakes and strikes the sediment mould, the sediment of not drawing patterns shakes and falls to the returning back groove of abdomen drawing patterns sediment zip fastener machine, abdomen drawing patterns sediment zip fastener machine is settled under the concrete on horizontal frame, by the aircraft nose speed reducer, aircraft nose initiative star gear, the driven star gear of tail, the chain, drag the flitch, the aircraft groove constitutes, the aircraft groove is formed by the steel sheet welding, the aircraft groove face is horizontal.
The cooling tower is a multi-layer cooling bed facility in which AOD jaw broken slag flatly moves on a cooling bed and falls into a lower cooling bed one by one from the upper cooling bed, the cooling tower is divided into a slow cooling chamber and a rapid cooling chamber by a middle partition wall, the same outdoor side wall is respectively provided with a chain plate bucket type lifter and is fixedly connected with a tower wall concrete body, wherein the slow cooling chamber comprises a frame, a material receiving and distributing chute, a head of a bed speed reducer, a head of a bed driving wheel, a tail of the bed driven wheel, the cooling bed, a head of the bed screening device, a cooling bed spraying device, a tower belly slow cooling chamber slag powder bin, a tower wall, a steel block grain steel collecting chamber, a slag powder bin spiral twisting machine, a tower top slow cooling chamber dust collector, a tower top powder selecting machine, an external tower variable frequency blower and the like, and the rapid cooling chamber comprises the frame, the material receiving chute, the head of the bed speed reducer, the head of the bed driving wheel, a tail of the bed driven wheel, the cooling bed, the head, a head material pouring chute, a cold blowing device, a tower belly rapid cooling chamber slag bin, a cooling chamber, a material pouring chute, a cooling chamber powder bin, a cooling chamber and a cooling chamber, The tower wall, a slag powder spiral twisting machine of a slag powder bin, an outlet of the side wall of the quenching slag and slag powder, a dust collector of a quenching chamber at the tower top, a powder concentrator at the tower top, a variable-frequency blower outside the tower and the like; the slow cooling chamber and the cooling bed of the fast cooling chamber are characterized in that: the cooling bed is arranged on a plurality of layers of racks at equal intervals from top to bottom, each rack is provided with a wheel of cooling bed, the cooling bed is a rib type metal mesh belt, the head of the bed is used for receiving materials, the tail of the bed is used for discharging materials, and fixed baffles are arranged on two sides of the receiving surface of the head of the cooling bed to prevent the discharged materials from rolling off from two sides of the cooling bed; the screening device at the head of the slow cooling chamber is characterized in that: a row of multi-layer bed head vibrating sieves which are equally spaced from top to bottom are respectively arranged at two ends of the frame, each vibrating sieve is provided with a screen material receiving trough and a screen material receiving chute, the screen surface of the vibrating sieve receives the unloading of the bed tail of the upper layer of the cooling bed, the residual slag blocks of the screen material are conveyed into the bed tail of the lower layer of the cooling bed through the screen material receiving trough and are uniformly tiled on the cooling bed, the coarse slag powder under the screen is conveyed into a slag powder descending pipeline through the screen material receiving chute and falls into a slag bin at the bottom of the cooling tower, the screen material on the vibrating sieve at the tail end is residual steel blocks and granular steel after the slag blocks are fully pulverized, and the residual steel blocks and granular steel are discharged into a cooling tower through a screen chute and conveyed into a carriage; the slow cooling chamber cooling bed spraying device is characterized in that: a group of longitudinally arranged transverse spray pipes with equal intervals are distributed on the upper net belt of each layer of cooling bed, the lower arc surface of each spray pipe is provided with uniformly and densely distributed round fine water outlets with equal intervals, one end pipe orifice of each layer of spray pipe is closed, the water inlet end of the other end of each layer of spray pipe is connected with one water inlet branch pipe of the layer, the water inlet branch pipe is provided with a flow regulating valve and a flow meter to regulate and distribute the water inlet amount of each layer of cooling bed, each water inlet branch pipe is connected with a water outlet main pipe of a water pump, the water pump motor is a variable frequency motor, the water inlet branch pipes, the flow regulating valves of the water inlet branch pipes and the flow meter are arranged on the same outer side of the tower wall, and the total water supply amount and the flow of each water inlet branch pipe can be regulated according to slag temperature data and the surface finish degree of grain steel displayed by a temperature measuring system; the quenching chamber cold bed blowing and blowing device is characterized in that: a group of longitudinally-arranged transverse equidistant air spraying pipes are distributed in the middle of an upper mesh belt and a lower mesh belt of each layer of cooling bed, a longitudinal equidistant round air outlet is formed in the upper arc surface of each air spraying pipe, one end pipe orifice of each air spraying pipe of each layer is sealed, the air inlet end of the other end of each air spraying pipe is connected with one air inlet branch pipe of the layer, each air inlet branch pipe is provided with a flow regulating valve and a flow meter to regulate and distribute the cold air volume of each layer of cooling bed, each air inlet branch pipe is connected with an air outlet main pipe of a blower, the blower is a variable frequency blower, the total air inlet volume and the air volume of each air inlet branch pipe are adjustable according to slag temperature data displayed by a temperature measuring system, and the variable frequency blower, the air inlet branch pipes, the flow regulating valves of the air inlet branch pipes and the flow meters are arranged on the same side outside the tower wall.
Compared with the prior art, the invention has the beneficial effects that:
the process adopts the slag casting machine to mould the molten slag, the slag blocks are formed regularly, so that the time required for cooling the molten slag into blocks and further cooling and pulverization is short, the molten steel in the molten slag is cooled into regular blocks in the slag mould, the generation of large sheet-shaped irregular steel sheets is avoided, and the precondition is created for the implementation of the stainless steel slag mechanized assembly line dry processing process.
The process adopts a slag mold with two open ends and a semi-cylindrical containing cavity and a cofferdam pouring molding process, so that the contact surface between slag and the slag mold is minimized, a slag mold guniting process is adopted, a natural separation interface is formed between a slag block and the slag mold, and a belly slag casting mold rapping and demolding slag returning device is adopted, so that a reinforced separation interface is formed between the slag block and the slag mold, the slag block and the slag mold play a role together, the problem that the steel slag is difficult to demold when being molded into blocks by the steel slag mold is solved, and the smooth implementation of the stainless steel slag mechanical assembly line dry processing process is ensured.
The process adopts a two-stage jaw crushing and screening process of the cast slag blocks, the high-temperature metal blocks with smaller slag block granularity and larger blockiness are screened out before the crushed slag blocks enter the cooling tower, the total heat of the slag blocks entering the cooling tower is reduced, the surface area is increased, and conditions are established for accelerating the cooling speed of entering the tower.
The process adopts a pulverization process of jaw broken slag in a cooling tower annular cooling chamber, the reciprocating material distribution of the broken slag on a multi-layer cooling bed is used for cooling and pulverization, the flow rate can be regulated and controlled, the rapid atomized water is sprayed for cooling and powder assisting, the air draft cooling at the tower top is used for cooling and powder assisting, a vibrating screen is used for screening and stripping the pulverized powder of the slag block for assisting the powder assisting, the slag block is pulverized thoroughly, the comprehensive moisture of the slag powder is controlled below 2%, and the collected metal particles are clean.
The process adopts a cooling tower slow cooling indoor pulverization facility and adopts a process that a tower cover cap, a tower top dust collector collect dust, a cooling tower bottom material bin collects coarse slag powder, the coarse slag powder is subjected to dust separation by a powder concentrator and a dust collector, so that the treatment process is environment-friendly and has no dust escape, and the slag powder is completely recovered.
The process adopts the process that jaw broken slag is screened by a vibrating screen to select large regular formed steel, inner cooling bed pulverized slag in a tower is screened by a bed head vibrating screen to select small steel and granular steel, and coarse slag powder in a bottom material bin of a cooling tower is sorted by a powder sorter to obtain fine steel powder, so that metal materials in the stainless steel slag are completely recycled.
The process adopts the technology of die casting of molten slag, crushing of slag blocks, pulverization of crushed slag blocks, vibrating screen and powder concentrator to separate metal materials from slag powder, is suitable for sorting and recycling of metal materials in various stainless steel slag of 200 series, 400 series and 300 series, solves the difficult problems that the metal materials of the stainless steel slag of 300 series are not magnetized and are not easy to recycle, simultaneously, the molten stainless steel discharged into a slag tank in the operation processes of pouring residues and deslagging in a bale is die cast into steel blocks with regular shapes and basically consistent lumpiness, and the high-risk operation of breaking and crushing large steel sheets does not exist any more.
The process is provided with air cooling and spraying cooling facilities, regulates and controls the cooling intensity of each material bed through temperature measurement system data, and realizes gamma-C by balanced cooling and slow cooling of AOD (argon oxygen decarburization) crushed slag 2 S phase transformation and pulverization and rapid cooling for realizing beta-C 2 Solidifying S phase to maintain the shape of slag block, and producing gamma-C 2 The S phase fine slag powder can also be used for producing beta-C 2 S phase fine slag powder, the production line has flexibility, the capability of meeting market demands is enhanced, and the beta-C 2 The S-phase fine slag powder has strong activity, the potential value is brought into play, and the economic benefit is improved.
[ description of the drawings ]
FIG. 1 is a simplified diagram of a stainless steel slag dry separation process according to the present invention.
FIG. 2 is a detailed view of the stainless steel slag dry separation process of the present invention.
FIG. 3 is a schematic view of the slag casting mold of the present invention.
Fig. 4 is a schematic view of a slag casting machine of the present invention.
FIG. 5 is a longitudinal sectional view of the slow cooling chamber of the cooling tower of the present invention.
FIG. 6 is a schematic longitudinal cross-sectional view of a quench chamber of a cooling tower of the present invention.
In the attached drawings, 3-1 parts of a single-cavity slag mould, 3-2 parts of a double-cavity slag mould, 3-3 parts of a mould lug; 4-1, a slag casting machine, 4-2, a slag mold side wall weir-enclosing pouring section, 4-3, a slag mold side wall weir-enclosing pouring baffle, 4-4, a slag mold cavity guniting section, 4-5, a slag tank support platform, 4-6, a slag casting section, 4-7, a slag casting machine abdomen slag mold vibrator, 4-8, an abdomen demoulding slag zipper machine and 4-9 abdomen demoulding slag discharge ports; 5-1, slow cooling chamberA chain plate bucket elevator, 5-2 parts of a slow cooling chamber distribution chute, 5-3 parts of a slow cooling chamber cooling bed, 5-4 parts of a cold water spraying system, 5-5 parts of a slow cooling chamber dust collector exhaust fan, 5-6 parts of a bed head vibrating screen, 5-7 parts of a gamma-C 2 S phase slag powder descending pipeline, 5-8 slow cooling chamber slag powder bin, 5-9 block steel grain steel carriage, 5-10 pipe type auger conveyor, 5-11 gamma-C 2 S-phase slag powder chain plate bucket elevator, 5-12, gamma-C 2 S-phase slag powder selecting machine, 5-13 parts of slow cooling chamber dust collector; 6-1 parts of a quenching chamber chain plate bucket elevator, 6-2 parts of a quenching chamber distribution chute, 6-3 parts of a quenching chamber cooling bed, 6-4 parts of a cooling bed air cooling system pipeline, 6-5 parts of a quenching chamber dust collector exhaust fan, 6-6 parts of a pouring chute, 6-7 parts of a quenching chamber slag powder bin, 6-8 parts of a tubular auger conveyor, 6-9 parts of a tubular ball crusher feeding belt, 6-10 parts of a beta-C 2 S-phase slag powder chain plate bucket elevator 6-11 beta-C 2 S phase slag powder selecting machine 6-12, quenching chamber dust collector.
[ detailed description ] embodiments
As shown in figure 1, the dry separation process for stainless steel slag comprises four process sections, namely liquid slag die casting crushing, dry separation for electric furnace crushed slag, dry balanced cooling slow cooling separation for AOD crushed slag and dry rapid cooling and rapid cooling separation for AOD crushed slag; the invention provides a specific implementation method of a stainless steel slag dry separation process, which comprises the following steps:
step one, when the converter begins to slag, starting a slag-mud stirrer, mixing and stirring the slag-mud into slag mud according to the ratio of stainless steel slag powder to water of 85: 15, and putting the slag mud into a mud-injection pump material pool for later use;
step two, when the converter begins to slag, starting a demolding slurry stirrer, diluting and stirring the raw vermiculite powder (60-70%) with 50-100 meshes, the blast furnace cloth bag dedusting ash (30-40%) and 0.5 times of clear water into demolding slurry for later use;
thirdly, the slag pot transport vehicle transports the slag pot filled with the high-temperature thermal-state stainless steel slag with the temperature of 1660-1680 ℃ to the tail end of the slag casting machine 4-1, and the travelling crane transports the slag pot from the slag pot transport vehicle to the slag pot support of the slag casting platform at the tail end of the slag casting machine 4-1;
step four, after the slag casting machine is started to operate stably, the mud injection pump is started, two mud injection guns led out from the mud injection pump are fixedly and vertically inserted into a gap of a slag mold side wall cofferdam pouring baffle 4-3 of a slag mold side wall cofferdam pouring section 4-2 of a single-cavity slag mold 3-1 or a double-cavity slag mold 3-2 above mold lugs 3-3, mud injected from the mud injection guns is injected into the gap of the slag mold side wall cofferdam pouring baffle 4-3, mud injection above the mold lugs 3-3 moves forwards along with the slag mold and forms a side wall cofferdam to enclose openings at two ends of the slag mold;
step five, the slag mold which completes the cofferdam enclosure enters a slag mold cavity guniting section 4-4, a demolding grout nozzle is vertically fixed above the initial end of the slag mold cavity guniting section 4-4, a guniting machine is started, the demolding grout is sprayed on the surface of a slag mold cavity, and the thickness of the demolding grout is 1 mm-1.5 mm;
step six, the slag mould which finishes spraying the demoulding slurry enters a casting slag section 4-6 after passing through the lower part of a slag pot support platform 4-5, a slag pot tipping mechanism slowly inclines the slag pot to enable the slag to uniformly flow through a slag runner and then flow into a slag mould cavity, the slag is gradually cooled and encrusted in the slag mould to be solidified, the position of the encrusted slag mould is observed, a spraying system is started to accelerate cooling and solidification of the casting slag, and the surface temperature of the slag block is 1100-1200 ℃ when the machine head demoulding slag does not have loose core slag;
seventhly, the main component raw vermiculite powder in the demolding slurry is subjected to thermal expansion to form a separation interface of a slag block and a slag mold, the slag mold with two open ends reduces the contact surface of the slag block and the slag mold, the demolding of a head of the slag block is accelerated, the slag block falls off from the slag mold under the action of self gravity after reaching the head and enters a first-level jaw crusher opening, the slag mold returning to the ventral side of the machine is fallen on a base steel plate of a belly slag mold vibrator 4-7 of a slag casting machine and passes through, the vibrator vibrates the slag mold, un-demolded slag is vibrated and falls into a machine groove of a belly demolding slag zipper machine 4-8, and the un-demolded slag is discharged from a belly demolding slag discharge opening 4-9 and enters the first-level jaw crusher opening through a zipper tape;
step eight, crushing slag blocks entering a machine port of a first-stage jaw crusher, then, falling the crushed slag blocks onto a vibrating screen for screening, vibrating large steel blocks on the screen surface to fall into a large steel block carriage, sliding screened slag into a machine port of a second-stage jaw crusher through a chute for continuous crushing, regulating and controlling the granularity of the slag blocks at an outlet to be below 30mm, regulating and controlling the air volume of a dust removal fan at the machine port, controlling the surface temperature of the slag blocks at the second-stage jaw crusher to be 900-1000 ℃, exhausting air, removing dust and entering a dust collector of a slow cooling chamber;
ninth, after piling up the broken slag of the electric furnace broken by the second-level jaw crusher, batch feeding the broken slag into a closed tubular ball crusher feeding belt 6-9 to be crushed by the tubular ball crusher, separating small steel and granular steel from the ground broken slag by a vibrating screen, intensively piling up the broken slag under the screen and grinding the broken slag by quenching time in a staggered mode, batch feeding the broken slag into a tubular ball mill to be ground, and discharging the ground abrasive by a beta-C grinding machine 2 S phase slag powder chain plate bucket elevator 6-10 feeds beta-C 2 6-11 separation of an S-phase slag powder separator, feeding steel fine powder into a fine powder bin through a coarse medium powder collecting cone, and feeding electric furnace slag fine powder into an electric furnace slag fine powder final slag bin through a fine powder collecting cone;
step ten, lifting AOD broken slag broken by a secondary jaw crusher to the top layer of a slow cooling chamber of a cooling tower by a slow cooling chamber chain plate bucket elevator 5-1 for discharging slag, dividing and sliding slag blocks into the tail end of the uppermost layer of a slow cooling chamber cooling bed 5-3 along a slow cooling chamber dividing chute 5-2, transversely dividing and expanding the slag blocks in the sliding process of the chute surface, uniformly spreading the slag blocks on the cooling bed, arranging a slag block temperature measuring system, an infrared probe aiming material bed and an electronic processing unit outside the tower on a steel structure frame at the tail end of each layer of cooling bed, enabling the slag blocks to be subjected to balanced cooling under the action of negative pressure in the tower formed by cold water spraying system 5-4 with adjustable flow above the material surface of the cooling bed in the operation process and air draft of a slow cooling chamber dust collector 5-5 air draft device, and converting the balanced cooling from inside to gamma-C under the action of negative pressure in the tower 2 S phase slag is pulverized, the slag powder reaching the head end of the bed falls on the screen surface of a bed head vibrating screen 5-6 for screening, and the slag powder below the screen falls into gamma-C 2 S-phase slag powder descending pipeline 5-7 is fed into slag powder bin 5-8 of slow cooling chamber, the slag on the sieve is spread on the next layer of cooling bed by material-dividing chute, in the course of operation the flow rate of cold water spray system 5-4 with adjustable flow rate is above the material surface of cooling bed, and the combined action of negative pressure air-extracting and cold air-cooling in tower formed by air-extracting fan 5-5 of dust collector of slow cooling chamber can continuously reduce temperature and make powder from outside to inside, the slag powder reached to head end of bed can is fallen on the sieve surface of bed head vibration sieve 5-6 and screened, the slag powder fallen under the sieve is gamma-C 2 S-phase slag powder descending pipeline 5-7 enters a slag powder bin 5-8 of a slow cooling chamber, the slag blocks on the screen are uniformly paved on the next layer of cooling bed by a material distribution chute, and the process is repeated in a circulating way, and the slag temperature control tower of the head of each layer of cooling bed is measured by a slag block temperature measurement systemThe slag blocks are completely pulverized by the total flow of the internal ventilation and cold water spraying systems 5-4 and the cold water spraying distribution amount of each layer of cooling bed, after being screened by a vibrating screen at the tail end, oversize products are residual clean metal blocks, the oversize products are led out from the cooling bed at the lowest layer and are conveyed to a steel block steel grain steel carriage 5-9 in a slow cooling chamber through a metal block leading-out pipeline, the steel block steel grain steel carriage is quantitatively cleaned and transported, and descending coarse slag powder and gamma-C are settled in the slow cooling chamber 2 The coarse slag powder flowing out of the S-phase slag powder descending pipeline 5-7 is collected in the slag powder bin 5-8 of the slow cooling chamber at the tower belly, and the slag powder in the slag powder bin 5-8 of the slow cooling chamber is twisted out by the tubular auger conveyor 5-10 and sent to gamma-C 2 S phase slag powder chain plate bucket elevator 5-11, which is lifted to gamma-C 2 5-12 sorting of S-phase slag powder sorting machine, feeding steel fine powder into fine powder bin and gamma-C through coarse and medium powder collecting cone 2 The S phase slag powder is processed by fine powder collection and cone injection into gamma-C 2 S final slag bin, gamma-C ascending along with indoor negative pressure 2 S-phase fine slag powder is collected by a dust collector 5-13 of a tower top slow cooling chamber and is conveyed to gamma-C outside the tower through a descending pipeline 2 S, a final slag bin;
eleven, the AOD crushed slag crushed by the two-stage jaw crusher is lifted to the top layer of the quenching chamber of the cooling tower by a quenching chamber chain plate bucket elevator 6-1 to be discharged, slag blocks slide into the bed tail end of the uppermost layer of the quenching chamber cooling bed 6-3 along the groove surface of a quenching chamber distributing chute 6-2, the slag blocks are transversely distributed and expanded and evenly paved on the cooling bed in the sliding process of the chute surface, a slag block temperature measuring system, an infrared probe aiming material bed and an electronic processing unit are arranged outside the tower on a steel structure frame at the bed tail end of each layer of the cooling bed, the slag blocks are blown by strong cold air of a cooling bed air cooling system pipeline 6-4 at the bottom of the cooling bed in the operation process to be rapidly cooled, the slag blocks reaching the bed head end fall on a bed head material pouring chute 6-6 to slide into and evenly paved on the next layer of the cooling bed, and the slag blocks are blown by the cooling bed air cooling system pipeline 6-4 at the bottom of the cooling bed in the operation process to be rapidly cooled, the slag blocks reaching the head end of the bed fall on the bed head pouring chute 6-6 and then slide in and are evenly paved on the next layer of cooling bed, the circulation is repeated, the total air intake of the slag temperature control air cooling system of each layer of cooling bed head and the air volume distribution of the ventilation pipes at the bottom of each layer of cooling bed are measured by the slag block temperature measuring system, the rapid cooling of the slag blocks of the upper layer of cooling bed is realized, and the rapid temperature of the slag blocks of 725 ℃ -gamma-C at 525 DEG C 2 Phase transition temperature of S is fixed at beta-C 2 S phase slag, leading out quenching slag from a cooling bed at the lowest layer, leading the quenching slag into a feeding belt 6-9 of a closed tubular ball crusher through a chute for ball crushing, collecting crude slag powder descending in a quenching chamber in a tower belly quenching chamber slag powder bin 6-7, twisting the crude slag powder by a tubular auger conveyor 6-8, feeding the crude slag powder into the feeding belt 6-9 of the closed tubular ball crusher for crushing, separating small steel blocks and granular steel from crushed material discharged by a vibrating screen, feeding the crushed slag below the screen into a tubular ball mill for grinding, and grinding the ground material by a beta-C ball mill 2 S phase slag powder chain plate bucket elevator 6-10 feeds beta-C 2 6-11 separation by S phase slag powder separator, the steel fine powder is collected by coarse and medium powder collection cone and then is put into fine powder bin and beta-C 2 The S phase slag powder is collected by fine powder and is tapered into beta-C 2 S final slag bin, wherein fine slag powder which is carried upwards along with the air draft and dust suction of 6-5 draft fans of a dust collector of a quenching chamber is cooled and pulverized gamma-C 2 S phase slag powder with small quantity is collected by a dust collector 6-12 of a quenching chamber and then is conveyed to gamma-C outside the tower through a descending pipeline 2 S, a final slag bin;
step twelve, returning the steel blocks and the steel granules to steelmaking for recycling, using the steel fine powder as a sintering raw material, and using the electric furnace slag fine powder and AOD gamma-C 2 S phase fine slag powder, AOD beta-C 2 The S phase fine slag powder is used as an auxiliary material for producing cement.
The equipment selection of the stainless steel slag dry separation process is determined by the yield of the stainless steel slag.
Claims (10)
1. A stainless steel slag dry separation process is characterized by comprising four process sections, namely liquid slag die casting crushing, dry separation of electric furnace crushed slag, dry balanced cooling slow cooling separation of AOD crushed slag and dry rapid cooling fast cooling separation of AOD crushed slag; wherein, the liquid slag die casting crushing process comprises the following steps: adding water into stainless steel slag powder, stirring in a stirrer to prepare slag mud, pouring the slag mud on a pouring section (4-2) of the side wall surrounding wall of a slag mould at the tail end of a casting machine at the running state of a slag casting machine (4-1) above a mould lug (3-3) of a single-cavity slag mould (3-1) or a double-cavity slag mould (3-2) and in a gap of a pouring baffle plate (4-3) of the side wall surrounding wall of the slag mould to form a side wall surrounding wall of the slag mould, and spraying the slag mould with a slurry spraying device to form a side wall surrounding wall of the slag mouldThe slurry section (4-4) sprays demoulding slurry on the surface of the slag mould, a slag ladle tipping device on the slag ladle support platform (4-5) tips the molten slag of the slag ladle to uniformly flow into the slag mould of the slag casting section (4-6), the slag casting mold passes through the shower section to be cooled and solidified, the solidified slag block is demolded at the head and falls into a first-level jaw crusher mouth for jaw crushing, a slag casting machine belly slag mold shaker (4-7) shakes and shakes the returning slag mold to shake and fall the unmolded slag block into a returning groove, the machine abdomen demoulding slag is brought back to a machine head by a machine abdomen demoulding slag zipper machine (4-8) and falls into a first-stage jaw crusher opening from a machine abdomen demoulding slag discharge port (4-9) to be crushed, large steel blocks are sieved by a linear vibrating screen, the sieved slag enters a second-stage jaw crusher to be crushed, an environment dust hood is arranged at the machine opening of the jaw crusher, dust enters a dust collector (5-13) of a slow cooling chamber, and the crushed slag enters a subsequent dry separation process section; the dry separation process of the electric furnace crushed slag comprises the following steps: piling broken slag of an electric furnace broken by a two-stage jaw crusher, feeding the piled broken slag into a closed tubular ball crusher feeding belt (6-9) to feed into the tubular ball crusher for crushing, separating small steel blocks and granular steel from ground crushed material by a vibrating screen, intensively piling the crushed slag under the screen and grinding the crushed slag in a quenching slag time-staggered manner, feeding the crushed slag into a tubular ball mill for grinding in batches, and passing the ground abrasive through beta-C 2 S-phase slag powder chain plate bucket elevator (6-10) feeds beta-C 2 S phase slag powder sorting machine (6-11) sorting, wherein steel fine powder is fed into a fine powder bin through a coarse medium powder collecting cone, electric furnace slag fine powder is fed into an electric furnace slag fine powder final slag bin through a fine powder collecting cone, steel blocks and steel granules are returned to steel making for recycling, the steel fine powder is used as a sintering raw material, and the electric furnace slag fine slag powder is used as an auxiliary material for producing cement; the dry balanced cooling and slow cooling separation process of the AOD crushed slag comprises the following steps: broken AOD slag crushed by a two-stage jaw crusher is lifted to the top layer of a slow cooling chamber of a cooling tower by a slow cooling chamber chain plate bucket elevator (5-1) to be discharged, slag blocks slide into the tail end of a slow cooling chamber cooling bed (5-3) on the uppermost layer of the slow cooling chamber along a slow cooling chamber distribution chute (5-2), the slag blocks are transversely distributed and expanded and uniformly paved on the cooling bed in the sliding process of the chute surface, a slag block temperature measuring system, an infrared probe aiming material bed and an electronic processing unit are arranged on a steel structure frame at the tail end of each layer of cooling bed and are arranged outside the tower, the slag blocks are cooled in a balanced manner under the action of negative pressure in the tower formed by a cold water spraying system (5-4) with adjustable flow rate in the operation process and an exhaust fan (5-5) of the slow cooling chamber dust collector to be gradually converted into gamma-C 2 S phasePulverizing the slag, sieving the slag powder reaching the head end of the bed on the surface of a bed head vibrating screen (5-6), and sieving the slag powder into gamma-C 2 S-phase slag powder descending pipelines (5-7) enter a slag powder bin (5-8) of a slow cooling chamber, oversize slag is uniformly paved on a next layer of cooling bed through a material distribution chute (5-2) of the slow cooling chamber, the slag powder is continuously cooled and gradually pulverized from outside to inside under the combined action of cold water spraying and cooling and negative pressure air draft and cold air cooling in the tower in the operation process, the slag powder reaching the head end of the bed falls on the screen surface of a bed head vibrating screen (5-6) for screening, and the undersize slag powder falls into gamma-C 2 S-phase slag powder descending pipelines (5-7) enter slag powder bins (5-8) of a slow cooling chamber, the slag blocks on the screen are uniformly spread on the next layer of cooling bed by a material distributing chute, and the process is repeated in a circulating way, the air draft quantity of a dust collector exhaust fan (5-5) of a slag temperature control slow cooling chamber, the total flow of a cold water spraying system (5-4) and the cold water spraying distribution quantity of each layer of cooling bed, which are measured by a slag block temperature measuring system, are used for realizing the complete pulverization of slag blocks, and after the slag blocks are screened by a vibrating screen at the tail end, the oversize is the residual clean metal block particles, which are led out from the lowest layer cooling bed and sent to a steel block steel particle steel carriage (5-9) in the material collecting chamber through a metal block leading-out pipeline of the slow cooling chamber for quantitative cleaning, coarse slag powder descending in the slow cooling chamber is collected in a slag powder bin (5-8) of the slow cooling chamber at the tower belly, and is stranded out by a tubular auger conveyor (5-10) and sent to gamma-C. 2 S phase slag powder chain plate bucket elevator (5-11) for elevating to gamma-C 2 S phase slag powder separating machine (5-12) for separation, steel fine powder is collected into fine powder bin and gamma-C through coarse and medium powder collecting cone 2 The S phase slag powder is processed by fine powder collection and cone injection into gamma-C 2 S final slag bin, gamma-C ascending along with indoor negative pressure 2 S-phase fine slag powder is collected by a dust collector (5-13) of a slow cooling chamber at the tower top and then is conveyed to gamma-C outside the tower through a descending pipeline 2 S final slag bin, steel blocks and steel granules are returned to steel making for cyclic utilization, steel fine powder is used as sintering raw material for proportioning, and gamma-C 2 The S-phase fine slag powder is used as an auxiliary material for producing cement; the dry rapid cooling quenching separation process of the AOD crushed slag comprises the following steps: the AOD crushed slag crushed by the two-stage jaw crusher is lifted to the top layer of the quenching chamber of the cooling tower by a quenching chamber chain plate bucket elevator (6-1) for slag discharge, slag blocks slide into the tail end of the uppermost layer of the quenching chamber cooling bed (6-3) along a quenching chamber material distributing chute (6-2), and the slag blocks slide down on the chute surfaceThe transverse flow dividing expansion is uniformly paved on a cooling bed, the temperature is continuously reduced under the sweeping action of strong cold air of a cooling bed air cooling system pipeline (6-4) at the bottom of the cooling bed in the operation process, the slag blocks reaching the head end of the cooling bed fall on a material pouring chute (6-6) at the head of the bed and then slide in and are uniformly paved on the next layer of cooling bed, the circulation is repeated, a slag block temperature measuring system, an infrared probe aiming at the material bed and an electronic processing unit are arranged on a steel structure frame at the tail end of each layer of cooling bed, the slag block is rapidly reduced by regulating and controlling the granularity of broken slag at a second jaw and the blast intensity of each layer of material bed, and the gamma-C is rapidly spanned 2 Phase transition temperature of S is fixed to beta-C 2 S phase slag, the quenching slag is led out by a lowest layer cold bed and is arranged in a closed tubular ball crusher feeding belt (6-9) through a chute to enter the tubular ball crusher for ball crushing, coarse slag powder settled down in a quenching chamber is gathered in a slag powder bin (6-7) of a quenching chamber at the tower belly and is then stranded out by a tubular auger conveyor (6-8) and is sent into the closed tubular ball crusher feeding belt (6-9) to enter the tubular ball crusher for crushing, small steel and granular steel are separated from the crushed material after being crushed through a vibrating screen, the crushed slag under the screen is arranged in a tubular ball mill for grinding, and the ground material is ground through a beta-C ball mill 2 S phase slag powder chain plate bucket elevator (6-10) is fed into beta-C 2 S phase slag powder separating machine (6-11) for separation, steel fine powder is collected into fine powder bin and beta-C through coarse and medium powder collecting cone 2 The S phase slag powder is collected by fine powder and is tapered into beta-C 2 S final slag bin, wherein fine slag powder which is carried upwards along with the air suction and dust collection of an exhaust fan (6-5) of a dust collector of a tower top quenching chamber is cooled and pulverized gamma-C 2 S phase slag powder with small quantity is collected by a dust collector (6-12) of a quenching chamber at the top of the tower and then is conveyed to gamma-C outside the tower through a descending pipeline 2 S, a final slag bin; the steel blocks and the steel granules are returned to the steel making for recycling, the steel fine powder is used as the sintering raw material, and the gamma-C 2 S phase, beta-C 2 The S phase fine slag powder is used as an auxiliary material for producing cement.
2. The dry separation process of stainless steel slag according to claim 1, characterized in that the slag mold of the slag casting machine (4-1) is a single-cavity slag mold (3-1) or a double-cavity slag mold (3-2) made of a steel casting mold, the cross section of the steel casting mold is in a concave arc shape, the inner concave cavity is in a horizontal semi-cylinder shape, the two ends of the inner concave cavity are opened, the contact surface between the casting slag and the slag mold is reduced, the demolding is easy, the bottom surface of the slag mold extends outwards to form cuboid mold lugs (3-3), the horizontal surfaces of the mold lugs at the two sides are respectively provided with a pair of screw holes, and the slag mold is fixed on a chain.
3. The dry separation process of stainless steel slag according to claim 1, wherein the slag mold side wall cofferdam casting device is characterized in that a pair of vertical parallel slag mold side wall cofferdam casting baffles (4-3) fixed on a horizontal frame on the concrete is arranged on the planes of the mold lugs (3-3) and on the two sides of the rows of slag molds from the tail end slag mold side wall cofferdam casting section (4-2) to the casting slag section (4-6), the height of the baffles is equal to the height of the slag molds, the baffles are long outside and short inside, a gap is reserved between the baffles and the mold lug planes, stainless steel slag powder and water are added into the stirrer to be uniformly stirred to form slag mud, the water content of the slag mud is controlled to limit that the slag dams do not naturally collapse, two grouting gun heads of the grouting machine are respectively inserted into the gaps of the baffles, the flow rate of the grouting is adjusted according to the traveling speed of the slag molds, the cavity of the baffles is full of the slag mud, and the slag mold side wall cofferdams are formed after the slag molds are poured into the space between the baffles, the cofferdams at the two sides are firmly seated during the operation of the slag mold, and the openings at the two ends of the slag mold are sealed.
4. The dry separation process of stainless steel slag according to claim 1, wherein the de-molding slurry sprayed at the slag mold slurry spraying section (4-4) is prepared by diluting and stirring raw vermiculite powder as a main material and blast furnace cloth bag fly ash as an auxiliary material with water, the raw vermiculite powder in the slurry expands due to heating of high-temperature slag to form a separation interface between a slag block and a slag mold, and the slag block falls off from the slag mold under the action of self gravity and vibration when reaching a machine head and returning.
5. The dry separation process of stainless steel slag according to claim 1, characterized in that a slag casting machine belly slag mold vibrator (4-7) is arranged on the belly of the slag casting machine (4-1), a vibrator frame is arranged at the belly position close to the frame on the machine head, an inverted pendant of the vibrator is arranged at the lower end of the frame, a vibrator base is fixed with a steel plate fastened by bolts, the longitudinal two ends of the vibrator base steel plate are bent downwards, the returned slag casting mold is lapped on the vibrator base steel plate to pass through, the vibrator vibrates the slag mold, un-demolded slag is vibrated to fall into a returning groove of the slag demolding machine (4-8), the machine belly demolding slag zipper machine (4-8) returns the machine head, and the un-demolded slag from a belly demolding slag discharge port (4-9) falls into a first-level jaw crusher opening to be crushed.
6. The stainless steel slag dry separation process according to claim 1, wherein the cooling beds in the cooling tower are arranged on a plurality of layers of frames which are arranged from top to bottom at equal intervals, each frame is provided with a wheel of cooling bed, the cooling bed is a rib type metal mesh belt, the head of the bed is used for receiving materials, the tail of the bed is used for discharging materials, and fixing baffles are arranged on two sides of the receiving surface of the head of the cooling bed to prevent the falling materials from rolling off from two sides of the cooling bed.
7. The dry separation process of stainless steel slag according to claim 1, wherein a row of multi-layer bed head vibration sieves (5-6) are arranged at two ends of a slow cooling chamber frame respectively, the multi-layer bed head vibration sieves are arranged at equal intervals from top to bottom, each surface vibration sieve is provided with a screen surface material receiving chute and a screen underflow material receiving chute, the screen surface of the vibration sieve receives the discharge material of the tail of the upper layer cooling bed, the residual slag blocks of the screen overflow are conveyed to the tail of the lower layer cooling bed through the screen surface material receiving chute and are uniformly tiled on the cooling bed, the coarse slag powder of the screen underflow is conveyed to a slag powder descending pipeline through the screen underflow material receiving chute and falls into a slag bin at the bottom of the cooling tower, the screen overflow of the tail end vibration sieve is the residual steel and granular steel after the slag blocks are fully pulverized, and the residual steel and granular steel are discharged out of the cooling tower through the screen overflow chute and conveyed to a steel granular steel carriage (5-9).
8. The stainless steel slag dry separation process according to claim 1, wherein a group of longitudinally arranged spray pipes with equal spacing are distributed on the upper mesh belt of each layer of cooling bed in the slow cooling chamber, the lower arc surface of each spray pipe is provided with uniformly and densely distributed round fine water outlets with equal spacing, one end of each spray pipe of each layer is sealed, the water inlet end of each layer of spray pipe is connected with one water inlet branch pipe of the layer, the water inlet branch pipe is provided with a flow regulating valve and a flow meter to regulate and distribute the water inlet amount of each layer of cooling bed, each water inlet branch pipe is connected with a water outlet main pipe of a water pump, the water pump motor is a variable frequency motor, the water inlet branch pipe, the flow regulating valve of the water inlet branch pipe and the flow meter are arranged on the same side outside the tower wall, and the total water supply amount and the flow of each water inlet branch pipe are adjustable according to slag temperature data and surface finish degree of the granular steel displayed by a temperature measuring system.
9. The dry separation process for stainless steel slag as claimed in claim 1, wherein a set of longitudinally arranged and transversely equally spaced air injection pipes are arranged between the upper and lower mesh belts of each layer of cooling bed in the quenching chamber, each air injection pipe is provided with a longitudinally equally spaced circular air outlet on the upper arc surface, one end of each air injection pipe is closed, the other end of each air injection pipe is connected with an air inlet branch pipe of the layer, the air inlet branch pipe is provided with a flow control valve and a flow meter for regulating the amount of cold air distributed to each layer of cooling bed, each air inlet branch pipe is connected with an air outlet main pipe of a blower, the blower is a variable frequency blower, the total air inlet amount and the air inlet branch pipe air amount are adjustable according to slag temperature data displayed by a temperature measuring system, and the variable frequency blower, the air inlet branch pipes flow control valves and the flow meters are arranged on the same side outside the tower wall.
10. The stainless steel slag dry separation process according to claim 1, wherein in the liquid slag die casting crushing process section, the surface temperature of the demolded slag is controlled to be 1100-1200 ℃ by regulating and controlling the shower water spray quantity; controlling the surface temperature of the second-level jaw broken slag block to be 900-1000 ℃ by regulating and controlling the granularity of the slag block at the outlet of the jaw breaking machine and the air quantity of a machine-opening dust removal fan; the slag temperature of each layer of cooling bed head measured by the slag block temperature measuring system of the slow cooling chamber regulates and controls the ventilation quantity in the tower, the total flow of the cold water spraying system and the cold water spraying distribution quantity of each layer of cooling bed to realize the complete pulverization of the slag block: the slag temperature of the head of each layer of cooling bed measured by the slag block temperature measuring system of the quenching chamber is used for regulating and controlling the total air intake of the air cooling system and the air distribution of the ventilation pipes at the bottom of each layer of cooling bed, so that the slag block of the upper layer of cooling bed is rapidly cooled and rapidly spans gamma-C of 725-525 DEG C 2 Phase transition temperature of S is fixed to beta-C 2 S phase slag.
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| CN1593869A (en) * | 2003-09-11 | 2005-03-16 | 三泽住宅株式会社 | Jp2005081817 |
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| CN103100546A (en) * | 2011-11-09 | 2013-05-15 | 昌三机电科技(苏州)有限公司 | Stainless steel slag dry and wet combination treatment process |
| CN103290153A (en) * | 2013-06-05 | 2013-09-11 | 中冶建筑研究总院有限公司 | Steel slag treating technology |
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