CN114939591B - Dry separation process for stainless steel slag - Google Patents
Dry separation process for stainless steel slag Download PDFInfo
- Publication number
- CN114939591B CN114939591B CN202110215558.1A CN202110215558A CN114939591B CN 114939591 B CN114939591 B CN 114939591B CN 202110215558 A CN202110215558 A CN 202110215558A CN 114939591 B CN114939591 B CN 114939591B
- Authority
- CN
- China
- Prior art keywords
- slag
- powder
- steel
- cooling
- bed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000002893 slag Substances 0.000 title claims abstract description 592
- 238000000926 separation method Methods 0.000 title claims abstract description 54
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 51
- 239000010935 stainless steel Substances 0.000 title claims abstract description 51
- 239000000843 powder Substances 0.000 claims abstract description 211
- 238000001816 cooling Methods 0.000 claims abstract description 172
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 113
- 239000010959 steel Substances 0.000 claims abstract description 113
- 230000018199 S phase Effects 0.000 claims abstract description 76
- 239000000463 material Substances 0.000 claims abstract description 71
- 238000000034 method Methods 0.000 claims abstract description 62
- 238000010583 slow cooling Methods 0.000 claims abstract description 59
- 230000008569 process Effects 0.000 claims abstract description 56
- 238000005266 casting Methods 0.000 claims abstract description 36
- 238000010298 pulverizing process Methods 0.000 claims abstract description 17
- 239000002184 metal Substances 0.000 claims abstract description 15
- 229910052751 metal Inorganic materials 0.000 claims abstract description 15
- 238000005245 sintering Methods 0.000 claims abstract description 9
- 238000009628 steelmaking Methods 0.000 claims abstract description 9
- 239000004568 cement Substances 0.000 claims abstract description 8
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 238000004064 recycling Methods 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 70
- 238000010791 quenching Methods 0.000 claims description 50
- 230000000171 quenching effect Effects 0.000 claims description 49
- 239000000428 dust Substances 0.000 claims description 40
- 238000005507 spraying Methods 0.000 claims description 36
- 210000001015 abdomen Anatomy 0.000 claims description 26
- 230000001105 regulatory effect Effects 0.000 claims description 22
- 239000002002 slurry Substances 0.000 claims description 17
- 239000007921 spray Substances 0.000 claims description 16
- 238000012216 screening Methods 0.000 claims description 15
- 238000000227 grinding Methods 0.000 claims description 12
- 238000009826 distribution Methods 0.000 claims description 11
- 238000004512 die casting Methods 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 8
- 230000001276 controlling effect Effects 0.000 claims description 7
- 229910052902 vermiculite Inorganic materials 0.000 claims description 7
- 235000019354 vermiculite Nutrition 0.000 claims description 7
- 239000010455 vermiculite Substances 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- 239000000523 sample Substances 0.000 claims description 6
- 230000007704 transition Effects 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 238000007711 solidification Methods 0.000 claims description 5
- 230000008023 solidification Effects 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 238000009423 ventilation Methods 0.000 claims description 5
- 229910001208 Crucible steel Inorganic materials 0.000 claims description 4
- 230000001174 ascending effect Effects 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 208000037170 Delayed Emergence from Anesthesia Diseases 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 claims description 2
- 210000000988 bone and bone Anatomy 0.000 claims 1
- 238000001035 drying Methods 0.000 claims 1
- 238000011049 filling Methods 0.000 claims 1
- 239000007769 metal material Substances 0.000 abstract description 10
- 230000008901 benefit Effects 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000000498 ball milling Methods 0.000 abstract 4
- 125000004122 cyclic group Chemical group 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 7
- 238000002347 injection Methods 0.000 description 7
- 239000007924 injection Substances 0.000 description 7
- 230000009466 transformation Effects 0.000 description 6
- 238000007885 magnetic separation Methods 0.000 description 5
- 239000012071 phase Substances 0.000 description 5
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 230000002441 reversible effect Effects 0.000 description 3
- 230000032258 transport Effects 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000007865 diluting Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002923 metal particle Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000004781 supercooling Methods 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 241001584775 Tunga penetrans Species 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000009837 dry grinding Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000006148 magnetic separator Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
-
- 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
Landscapes
- 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 separation process of stainless steel slag, which consists of four process sections of stainless steel molten slag casting slag jaw breaking, electric furnace slag ball milling separation, AOD slag dry quick-cooling ball milling separation and AOD slag dry balance cooling slow-cooling pulverization separation, wherein the products of the electric furnace slag ball milling separation are block steel, steel fine powder and electric furnace slag fine powder, and the products of the AOD slag dry quick-cooling ball milling separation are block steel, steel fine powder and beta-C 2 S-phase fine slag powder and AOD slag dry-method balance cooling pulverization separation products are block steel grain steel, steel fine powder and gamma-C 2 S-phase fine slag powder, steel block grain steel returned to steelmaking cyclic utilization, steel fine powder as sintering raw material, electric furnace slag fine powder and gamma-C 2 S-phase fine slag powder, beta-C 2 The S-phase fine slag powder is used as auxiliary materials for producing cement, and the process is suitable for sorting various stainless steel slag systems, and has the advantages of safety, environmental protection, high metal yield, clean metal material and high recycling degree of slag powder in the sorting process.
Description
Technical Field
The invention relates to the technical field of stainless steel slag separation, in particular to a dry separation process of stainless steel slag.
Background
The stainless steel slag is in a lump after being cooled, is in a granular shape after being crushed, and has the characteristic of natural pulverization after being cooled, and the AOD steel slag contains more stainless steel metals due to slag pouring operation, ladle residue pouring operation and the like, wherein the metals exist in two different states, namely, the large metal blocks generated in the ladle residue pouring operation and the slag pouring operation, and the small metal particles generated by mixing the steel slag and solidifying the metal liquid drops in the slag. The current treatment process of stainless steel slag can be reviewed as dry treatment, namely, hot stainless steel slag is watered and pulverized, mechanical screening is carried out, large cast residual steel with irregular shape is lifted out in the screening and feeding process to carry out mechanical segmentation, 200 series and 400 series stainless steel have magnetism, slag steel and grain steel are selected by screening and feeding crushing and magnetic separation, metal materials in the slag under the screen are selected by a dry magnetic separator to be called as magnetic separation powder, 300 series stainless steel has no magnetism, slag steel is selected by artificial hand, and then crushed and screenedThe residue is separated into grain steel and steel fine powder by water separation, the tail mud is subjected to filter pressing dehydration, the slag steel and grain steel are returned to steelmaking for recycling, the magnetic separation powder or the steel fine powder is used for sintering ingredients, and the tail slag is mainly used for slag micro powder ingredients. The disadvantages of this type of process are represented by the following: firstly, the hot slag is powdered by water spraying, and no matter the hot slag tank is sprayed with water, a slag sealing pool is sprayed with water or a hot slag pile is sprayed with water, dust overflow can be generated in different degrees, the operation environment in a factory is bad, and the water spraying and dust overflow of the hot slag pile and the pipe insertion are most serious; secondly, dust is raised again in the process of transferring and sorting the powder slag, so that the environment is polluted; thirdly, the large cast steel sheets and the cast steel lumps can be fed into the furnace only after being broken into qualified blocks, so that the breaking operation efficiency is low and the danger coefficient is high; fourthly, as most of the powdered stainless steel slag subjected to water treatment is uneven in dry and wet, the average moisture content is basically 8-12%, the slag quantity of the separated slag steel, grain steel and magnetic separation powder is large, and the slag can be recycled only by dry grinding or water grinding selection, so that the treatment procedure is prolonged, and the site environment is further polluted; fifthly, because 300 series stainless steel is not magnetized, 300 series metal materials are limited in magnetic separation method separation, and for grain steel and refined powder, a jigger, a spiral classifier and a shaking table which take water as a medium are adopted for separation, and metal induction separation is adopted, so that a treatment line is additionally arranged on 300 series stainless steel slag, and the cost is increased; the sixth is that the main phase of the AOD steel slag is 2CaO.SiO 2 ，C 2 S can generate crystal form transformation in the cooling process, and one of the crystal forms is expressed as generating liquid phase slag and alpha-C at 2130 DEG C 2 Reversible transformation of S, alpha-C at 1420 DEG C 2 S and alpha' H -C 2 Reversible transformation of S, alpha 'occurs at 1160℃' H -C 2 S and alpha' L -C 2 S, the second of which is represented by the cooling pattern α 'occurring at 725℃under equilibrium cooling conditions' L -C 2 S and gamma-C 2 S, three of which are represented by alpha' L-C occurring at around 670℃under rapid supercooling conditions 2 S and beta-C 2 Reversible transformation of S, beta-C 2 S is a metastable state which converts unidirectionally 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 ) Respectively are provided with3.14, 3.20, 2.94 differ greatly, α' L -C 2 S、β-C 2 S conversion to gamma-C 2 S all undergo volume expansion and thus pulverization, wherein beta-C 2 S unidirectional transformation gamma-C 2 S volume expansion of about 12%, beta-C 2 S has gelling property, and gamma-C 2 S phase slag has no gelatinization, beta-C 2 The value of S phase slag is far greater than gamma-C 2 S-phase slag, so that treatment of stainless steel slag is more hopeful to obtain beta-C under the condition of rapid supercooling 2 S phase slag and rapidly cooling and crossing beta-C 2 S object opposite gamma-C 2 Phase transition temperature of S phase unidirectional transition to beta-C 2 S-phase slag is maintained, and the adjustable and controllable cooling temperature becomes a necessary precondition.
Disclosure of Invention
The invention aims to change the problems that hot slag water is seriously overflowed and dust is raised in the existing dry treatment process of stainless steel slag, the water content of the water is high, the danger of breaking large steel blocks is high, the magnetically separated stainless steel metal material is seriously required to be subjected to dry separation and impurity removal or water separation and impurity removal due to the sticky slag, the metal material in 300-series stainless steel slag is nonmagnetic, the metal material is required to be separated by combining the wet treatment process, tailings are collected in a filter pressing mode, the water consumption is high, the investment is high, the operation cost is high, and the slag powder obtained by a single balanced cooling slow-cooling pulverization process has the phase of gamma-C 2 S, and gamma-C 2 The S-phase slag powder has no gelatinization, has great influence on the added value in the silicate cement production and the like, and provides a dry separation process of the stainless steel slag, so as to realize the safety, environmental protection and high efficiency of stainless steel slag separation treatment operation.
In order to achieve the above object, the present invention is realized by the following technical scheme:
the dry separation process of the stainless steel slag comprises four process sections of die casting and crushing of liquid slag, dry separation of electric furnace crushed slag, dry balanced cooling and slow cooling separation of AOD crushed slag and dry rapid cooling and quenching separation of AOD crushed slag; 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, and casting the slag in-situ in the running state of the slag casting machineThe slag mold side wall enclosure pouring section of the tail end pours slag mud on the mold lugs and forms slag mold side wall enclosures in the gap of a slag mold side wall cofferdam pouring baffle, a slurry spraying device sprays demolding slurry on the surface of the slag mold in a slag mold slurry spraying section, a slag pot tipping device on a slag pot support platform tips slag pot molten slag and uniformly flows into the slag mold of the slag casting section, the casting slag mold passes through a shower section to accelerate cooling, crust formation and solidification, a solidified slag block machine head is demolded and falls into a first-stage jaw crusher, a casting slag mold bellow vibrator shakes and returns to the slag mold to shake and fall non-demolded slag blocks into a return groove, a bellow demolding slag is brought back to the machine head by a bellow demolding slag zipper machine and falls into a first-stage jaw crusher, a linear vibration sieve screens out massive steel, undersize slag enters a second-stage jaw crusher for crushing, a jaw crusher jaw is provided with an environment dust collecting hood, dust enters a slow cooling chamber, and the crushed slag enters a subsequent dry sorting process section; the dry separation process of the electric furnace crushed slag comprises the following steps: the electric furnace crushed slag crushed by the secondary jaw crusher is piled up and then fed into a closed tubular ball crusher feeding belt to be crushed by the tubular ball crusher, small steel blocks and granular steel are separated from ground materials by a vibrating screen, the screened crushed slag is concentrated and piled up and ground by a quenching slag in a staggered way, the ground materials are fed into a tubular ball mill for grinding in batches, the ground materials are fed into a powder selecting machine for sorting by a lifting machine, steel fine powder is fed into a fine powder bin through a coarse middle 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, the steel blocks and the granular steel are returned for steel making and recycling, the steel fine powder is matched with the steel fine powder as a sintering raw material, and the electric furnace slag fine slag powder is matched with auxiliary materials for producing cement; the dry balance cooling slow cooling sorting process of the AOD crushed slag comprises the following steps: the AOD crushed slag crushed by the secondary jaw crusher is lifted to the top layer of the cooling tower by a bucket elevator of a chain plate of a slow cooling chamber to discharge slag, slag blocks slide into the tail end of the uppermost layer of cooling bed of the slow cooling chamber along a material distributing chute, the slag blocks are horizontally distributed and expanded in the sliding process of the chute surface and uniformly spread 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 of the tail end of each layer of cooling bed, the slag blocks are balanced and cooled gradually from the surface to the inside under the action of cold water spray cooling with adjustable flow in the operation process and negative pressure in the tower formed by the suction of a dust collector suction fan, and are converted into gamma-C 2 S phase slag is pulverized and reaches the bedThe slag powder at the head end falls on the vibrating screen surface of the head of the bed for screening, and the slag powder below the screen falls into gamma-C 2 S-phase slag powder enters a slag powder bin of a slow cooling chamber in a descending pipeline of slag powder, the slag on a screen is evenly spread on a next layer of cooling bed by a material distributing chute, continuously cooled and gradually powdered from the surface to the inside under the combined action of cold water spraying and negative pressure induced draft cold air cooling in a tower in the operation process, slag powder reaching the head end of a bed falls on a vibrating screen surface of the bed head for screening, and the slag powder under the screen falls into gamma-C 2 S-phase slag powder enters a slag powder bin of a slow cooling chamber in a descending pipeline of S-phase slag powder, the slag on a screen is evenly spread on a next layer of cooling bed through a material distribution chute, so that the slag is circularly reciprocated, the ventilation quantity in a slag temperature regulation tower of each layer of cooling bed head measured by a slag block temperature measurement system, the total flow of a cold water spraying system and the cold water spraying distribution quantity of each layer of cooling bed are used for realizing complete pulverization of slag blocks, after being screened by a vibrating screen at the tail end, the oversize is remained clean metal block particles, the oversize is led out by the cooling bed at the lowest layer, is led out by the metal block leading-out pipeline of the slow cooling chamber, is conveyed to a block steel particle steel carriage parked in an aggregate chamber for quantitative clearing, the coarse slag powder which is settled and descends in the slow cooling chamber is gathered in the slag powder bin of the slow cooling chamber of the tower abdomen, and is stranded to be conveyed to gamma-C by a first tubular auger conveyor 2 S-phase slag powder chain plate bucket elevator, and the elevator is lifted to gamma-C 2 S-phase slag powder separator for separation, wherein the steel fine powder is fed into fine powder bin and gamma-C through coarse medium powder collecting cone 2 S phase slag powder enters gamma-C through a fine powder collecting cone 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 slow cooling chamber at the top of the tower and then is conveyed to the outside of the tower through a downlink pipeline 2 S final slag bin, steel block and grain steel are returned to steelmaking and recycled, and steel fine powder is used as sintering raw material for matching, gamma-C 2 S-phase fine slag powder is used as an auxiliary material for producing cement; the dry method rapid cooling quenching sorting process of the AOD crushed slag comprises the following steps: the AOD crushed slag crushed by the secondary jaw crusher is lifted to the top layer of the quenching chamber of the cooling tower by a quenching chamber chain plate bucket elevator, slag blocks slide into the tail end of the uppermost layer of cooling bed of the quenching chamber along a quenching chamber material distribution chute, the slag blocks are transversely distributed and expanded in the sliding process of the chute surface and uniformly spread on the cooling bed, and the slag blocks are continuously cooled by the blowing effect of strong cold air of the pipeline of the cooling bed air cooling system at the bottom of the cooling bed in the operation process, so as to reach the head of a bedThe slag at the end falls on a bed head pouring chute, slides into and is uniformly spread on the next layer of cooling bed, and is circularly reciprocated, 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, and the slag block is quickly cooled and quickly spans gamma-C by regulating and controlling the broken slag granularity of a second jaw and the blast intensity of each layer of material bed 2 The phase transition temperature of S phase is fixed to be beta-C 2 S phase slag, leading out quenching slag by a lowest layer cooling bed, feeding the quenching slag into a feeding belt of a closed tubular ball crusher to be crushed by a tubular ball crusher through a chute, collecting coarse slag powder which is precipitated and descending in a quenching chamber in a slag powder bin of a tower belly quenching chamber, feeding the coarse slag powder into the closed tubular ball crusher to be crushed by a tubular ball crusher through a feeding belt of the closed tubular ball crusher, separating small steel blocks and granular steel from the crushed materials through a vibrating screen, feeding the undersize slag into a tubular ball mill to be crushed, and grinding the crushed materials into beta-C powder by a beta-C ball mill 2 S-phase slag powder chain plate bucket elevator feeding beta-C 2 S-phase slag powder separator for separation, wherein the steel fine powder enters a fine powder bin through a coarse medium powder collecting cone, and the steel fine powder is beta-C 2 S-phase slag powder is added into beta-C through a fine powder collecting cone 2 S final slag bin, carrying fine slag powder upward along with exhaust and dust collection of exhaust fan of dust collector of quenching chamber at tower top is gamma-C powder obtained by cooling and pulverization 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 conveyed to the outside of the tower through a downlink pipeline 2 S, a final slag bin; steel blocks and granular steel are returned to steelmaking and recycled, and the steel refined powder is used as sintering raw material for matching, and 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 gear, a machine tail driven star gear, a fixed chain wheel, a chain, a slag mold, a machine head slag mold side wall enclosing wall, a slag mold side wall cofferdam casting device, a slag mold slurry spraying device, a slag tank tipping device, a casting slag mold shower device, a machine belly casting slag mold vibrating device, a concrete lower horizontal frame and a machine belly demoulding slag returning device; the slag mold is characterized in that: the slag mold is made of cast steel, the cross section of the slag mold is in a concave arc shape, the inner concave surface containing cavity is in a horizontal semi-cylinder shape, the two ends of the inner concave surface containing cavity are open, the contact surface between casting slag and the slag mold is reduced, the slag mold is easy to demould, the bottom surface of the slag mold extends outwards to form a rectangular mold lug, a pair of screw holes are respectively arranged on the horizontal surfaces of the mold lugs at the two sides, and the slag mold is fixed on a chain; the slag mold side wall cofferdam pouring device is characterized in that: a pair of vertical parallel baffles fixed on a horizontal frame on the concrete are arranged on two sides of a plurality of slag discharging molds from a casting section at the tail end to a casting slag section and above the mold lug plane, the height of each baffle is equal to the height of each slag mold, gaps are reserved between each baffle and the mold lug plane, stainless steel slag powder and water are added into a stirrer to be uniformly stirred to form slag mud, the water content of the slag mud is controlled to be limited by the fact that no natural slump of a slag mud weir occurs, two grouting gun heads of a grouting machine are respectively inserted into the gaps of the baffles, the grouting flow is adjusted according to the travelling speed of the slag mold, the space between the baffles is filled with the slag mud to form a slag mold side wall cofferdam, cofferdams at two sides are solid in the operation of the slag mold, and openings at two ends of the slag mold are sealed; the slag die spraying release slurry is characterized in that: the demoulding slurry is prepared by diluting and stirring blast furnace cloth bag dedusting ash taking the raw vermiculite powder as a main material and adding water as an auxiliary material, wherein the raw vermiculite powder in the slurry expands to form a separation interface between a slag block and a slag mould due to the heating of high-temperature slag, and the slag block falls off from the slag mould under the self gravity and the vibration in the returning process of a machine head; the machine belly casting slag mould vibrating and demoulding slag returning device is characterized in that: the machine head is characterized in that a vibrator frame is arranged at the abdomen position close to the frame on the machine head, a steel plate fastened by bolts is fixed on a vibrator base, a vibrator inverted pendant is arranged at the lower end of the frame, the two longitudinal ends of the steel plate of the vibrator base are bent downwards, a returned casting slag die falls on the steel plate of the vibrator base to pass through, the vibrator shakes the slag die, non-demolding slag shakes to fall into a return groove of the machine head web demolding slag zipper machine, the machine head web demolding slag zipper machine is arranged on a concrete lower horizontal frame and consists of a machine head speed reducer, a machine head driving star gear, a machine tail driven star gear, a chain, a dragging plate and a machine groove, the machine groove is formed by welding steel plates, and the machine groove surface is horizontal.
The cooling tower is a multi-layer cooling bed cooling facility in which AOD jaw slag breaking is horizontally paved and moved on a cooling bed, an upper cooling bed 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 quenching chamber by a middle partition wall, a chain plate bucket elevator is respectively arranged on the same outdoor side wall and is fixedly connected with a tower wall concrete body, wherein the slow cooling chamber consists of a frame, a receiving and distributing chute, a head speed reducer, a head driving wheel, a bed tail driven wheel, a cooling bed, a head 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 slag powder spiral reamer, a tower top cooling chamber dust collector, a tower top slow powder collector, a tower outer variable frequency blower and the like, and the quenching chamber consists of a frame, a receiving and distributing chute, a cooling bed blowing and blowing device, a tower belly slag powder bin, a tower wall, a slag powder spiral reamer, slag powder and slag powder side wall outlet, a tower top variable frequency blower and the like; the slow cooling chamber and the quenching chamber cooling bed are characterized in that: the cooling beds are 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, each cooling bed is a rib type metal mesh belt, the head of the bed is used for receiving materials and the tail of the bed is used for discharging materials, and two sides of the head of the cooling bed are provided with fixed baffles for preventing blanking from rolling off from two sides of the cooling bed; the slow cooling chamber bedside screening device is characterized in that: the two ends of the frame are respectively provided with a row of multi-layer head vibrating screens which are equidistant from top to bottom, each face of the vibrating screen is provided with a screen surface material receiving trough and a screen surface material receiving chute, the screen surface of the vibrating screen receives the unloading of the upper layer cooling bed tail, the residual slag blocks of the screen surface materials are evenly spread on the cooling bed along the lower layer cooling bed tail through the screen surface material receiving trough, the coarse slag powder of the screen surface materials falls into the slag powder descending pipeline through the screen surface material receiving chute and falls into the slag bin at the bottom of the cooling tower, and the last end of the vibrating screen material is residual block steel and grain steel after the slag blocks are fully pulverized and is discharged out of the cooling tower through the screen surface chute along the conveying pipe and enters the carriage; the slow cooling chamber cooling bed spray device is characterized in that: a group of transverse equidistant spray pipes are distributed on an upper net belt of each layer of cooling bed, the lower cambered surface of each spray pipe is provided with uniformly and densely distributed equidistant round thin water outlets, one pipe orifice of each spray pipe of each layer is closed, the other water inlet end of each spray pipe is connected with one water inlet branch pipe of the layer, the water inlet branch pipes are provided with flow regulating valves and flow meters for regulating and distributing the water inflow 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 meters are arranged on the same side outside the tower wall, and the total water supply quantity and the flow of each water inlet branch pipe are adjustable according to slag temperature data and grain steel surface finish displayed by a temperature measuring system; the cooling bed blast blowing device of the quenching chamber is characterized in that: a group of longitudinally arranged transverse equidistant air spraying pipes are distributed in the middle of upper and lower mesh belts of each layer of cooling bed, a longitudinal equidistant circular air outlet is formed in the upper cambered surface of each air spraying pipe, one end pipe orifice of each air spraying pipe of each layer is closed, the air inlet end of the other end of each air spraying pipe is connected with an air inlet branch pipe of the layer, the air inlet branch pipes are provided with flow regulating valves and flow meters for regulating and distributing cold air quantity of each layer of cooling bed, each air inlet branch pipe is connected with an air outlet main pipe of an air blower, the air blower is a variable-frequency fan, the total air inlet quantity and the air quantity of each air inlet branch pipe are adjustable according to slag temperature data displayed by a temperature measuring system, and the variable-frequency air blower, the air inlet branch pipes, the air inlet branch pipe flow regulating valves and the flow meters are arranged on the same side outside a tower wall.
Compared with the prior art, the invention has the beneficial effects that:
the technology adopts the slag casting machine to mould the molten slag, the slag blocks are formed in a small regular manner, so that the time required for cooling the molten slag into blocks and further cooling and pulverizing is short, molten steel in the molten slag is cooled into regular blocks in the slag mould, the generation of large-sheet irregular shaped steel sheets is avoided, and preconditions are created for the implementation of the dry treatment technology of the stainless steel slag mechanized assembly line.
The process adopts a slag mold with two open ends and semi-cylindrical cavity and a cofferdam pouring molding process, so that the contact surface between slag and the slag mold is minimized, adopts a slag mold guniting process, forms a natural separation interface between slag blocks and the slag mold, adopts a belly casting slag mold rapping and demolding slag returning device, forms a reinforced separation interface between the slag blocks and the slag mold, plays a role together, solves the difficult problem that the steel slag mold is difficult to demold, and ensures the smooth implementation of a dry treatment process of a stainless steel slag mechanized assembly line.
The technology adopts a two-stage jaw breaking and screening technology of the cast slag blocks, high-temperature metal blocks with smaller granularity and larger block size of the slag blocks are screened out before the crushed slag blocks enter a cooling tower, the total heat quantity of the slag blocks entering the cooling tower is reduced, the surface area of the slag blocks is increased, and conditions are established for accelerating the cooling speed entering the cooling tower.
The process adopts jaw slag breaking and pulverization technology in a cooling tower circular cooling chamber, the pulverized slag is subjected to reciprocating material distribution and cooling pulverization on a multi-layer cooling bed, rapid atomization water spray cooling powder assisting with adjustable flow, tower top air draft and cooling powder assisting, and a vibrating screen is used for screening and stripping slag block pulverization surface powder assisting, so that slag block pulverization is thorough, the comprehensive moisture of slag powder is controlled below 2%, and collected metal particles are clean.
The process adopts a process that a cooling tower slow cooling indoor pulverization facility collects dust by a tower cover cap, a tower top dust collector and a cooling tower bottom bin collects coarse slag powder, and the coarse slag powder is collected by a powder selector and a dust collector, so that the treatment process is environment-friendly and free of dust escaping, and the slag powder is completely recovered.
The process adopts the processes of crushing slag by a jaw, screening large regular formed steel by a vibrating screen, screening the powder slag of a cooling bed in a tower by a head vibrating screen, screening small steel and granular steel, and screening coarse slag powder of a storage bin at the bottom of the cooling tower by a powder selector, so that metal materials in the stainless steel slag are completely recovered.
The technology adopts the technologies of molten slag die casting, block slag jaw breaking, slag block pulverizing, vibrating screen and powder selecting machine to separate metal materials from slag powder, is suitable for separating and recovering metal materials in various stainless steel slag of 200 series, 400 series and 300 series, solves the problems that the metal materials of the stainless steel slag of 300 series are not magnetized and are difficult to recover, and meanwhile, molten stainless steel discharged into a slag tank in the operation process of pouring the large ladle and the slag is die cast into steel blocks with basically consistent regular shape and block size, and high-risk operation of breaking the large steel sheet is avoided.
The process is provided with an air cooling and spray cooling facility, and the cooling intensity of each layer of material bed is regulated and controlled through data of a temperature measuring system, so that the process has the effect of realizing gamma-C by balanced cooling and slow cooling of AOD broken slag 2 S phase transformation to realize beta-C by pulverization and rapid cooling by rapid quenching 2 S phase solidification to maintain the slag block shape, and gamma-C can be produced 2 S phase fine slag powder can also produce beta-C 2 S-phase fine slag powder, and the production line has flexibility and is suitable for the marketEnhanced field demand capability, beta-C 2 The S-phase fine slag powder has strong activity, potential value is exerted, and economic benefit is improved.
Drawings
FIG. 1 is a schematic flow chart of a dry separation process of stainless steel slag.
Fig. 2 is a detailed flow chart of a dry separation process of stainless steel slag.
FIG. 3 is a schematic view of a slag mold according to the present invention.
FIG. 4 is a schematic view of a slag casting machine of the present invention.
FIG. 5 is a schematic view of a longitudinal section of a cooling tower slow cooling chamber of the present invention.
FIG. 6 is a schematic longitudinal 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 mold, 3-2 parts of a double-cavity slag mold, 3-3 parts of a mold lug; 4-1 parts of slag casting machine, 4-2 parts of slag mold side wall cofferdam pouring section, 4-3 parts of slag mold side wall cofferdam pouring baffle, 4-4 parts of slag mold cavity guniting section, 4-5 parts of slag tank support platform, 4-6 parts of slag casting section, 4-7 parts of slag casting machine belly slag mold vibrator, 4-8 parts of belly demolding slag zipper machine and 4-9 parts of belly demolding slag discharge outlet; 5-1 parts of a slow cooling chamber chain plate bucket elevator, 5-2 parts of a slow cooling chamber material distributing 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 head vibrating screen, 5-7 parts of a gamma-C 2 S-phase slag powder downlink pipeline, 5-8, slow cooling chamber slag powder bin, 5-9, block steel granule steel carriage, 5-10, first tubular auger conveyor, 5-11, gamma-C 2 S-phase slag powder chain plate bucket elevator, 5-12, gamma-C 2 S phase slag powder separator, 5-13, slow cooling chamber dust collector; 6-1, a quenching chamber chain plate bucket elevator, 6-2, a quenching chamber distributing chute, 6-3 quenching chamber cooling beds, 6-4, cooling bed air cooling system pipelines, 6-5, a quenching chamber dust collector exhaust fan, 6-6, a dumping chute, 6-7, a quenching chamber slag powder bin, 6-8, a second tubular auger conveyor, 6-9, a tubular ball crusher feeding belt, 6-10 and beta-C 2 S-phase slag powder chain plate bucket elevator, 6-11, beta-C 2 S phase slag powder separator, 6-12 parts and quenching chamber dust collector.
Detailed Description
As shown in fig. 1, the dry separation process of the stainless steel slag comprises four process sections of liquid slag die casting and crushing, dry separation of electric furnace crushed slag, dry balance cooling and slow cooling separation of AOD crushed slag and dry rapid cooling and quenching separation of AOD crushed slag; the following provides a concrete implementation method of the dry separation process of the stainless steel slag, which comprises the following steps:
step one, when a converter starts to slag, starting a slag mixer, adding stainless steel slag powder and water according to the ratio of 85:15, mixing into slag, and putting into a mud injection pump material pool for standby;
step two, when the converter starts to slag, starting a demoulding slurry stirrer, diluting and stirring raw vermiculite powder (60% -70%), blast furnace cloth bag dust (30% -40%) and 0.5 times of clear water into demoulding slurry for standby according to 50-100 meshes;
step three, a slag pot transport vehicle transports a slag pot filled with high-temperature thermal stainless steel slag with the temperature of 1660-1680 ℃ to the tail end of the slag casting machine 4-1, and a crane lifts the slag pot from the slag pot transport vehicle to a slag pot support of a slag casting platform at the tail end of the slag casting machine 4-1;
step four, after the casting slag machine is started to run stably, a 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 single-cavity slag die 3-1 or a slag die side wall cofferdam pouring baffle 4-3 on a double-cavity slag die 3-2 die lug 3-3 of a slag die side wall cofferdam pouring section 4-2, mud injection from the mud injection guns is injected into the gap of the slag die side wall cofferdam pouring baffle 4-3, mud injection on the die lug 3-3 moves forwards along with the slag die and forms a side wall cofferdam to enclose openings at two ends of the slag die;
step five, a slag mold which completes the closure of the cofferdam enters a slag mold cavity guniting section 4-4, a demolding slurry spray nozzle is vertically fixed above the initial end of the slag mold cavity guniting section 4-4, a guniting machine is started, demolding slurry is sprayed on the surface of a slag mold cavity, and the thickness of the demolding slurry is 1-1.5 mm;
step six, a slag mold which is sprayed with release slurry passes through the lower part of a slag pot support platform 4-5 and then enters a casting slag section 4-6, a slag pot tilting mechanism slowly tilts the slag pot to enable slag to uniformly flow through a slag ditch and then flow into a slag mold accommodating cavity, the slag is gradually cooled and crusted in the slag mold until solidification, the position of the crusted slag mold is observed, a spraying system is started to accelerate casting slag cooling solidification, loose core slag does not appear in machine head release slag, and the surface temperature of a slag block is 1100-1200 ℃;
step seven, the main component of the demoulding slurry, namely, raw vermiculite powder, is expanded by heating high-temperature slag to form a separating interface of a slag block and a slag mould, the slag moulds with openings at two ends reduce the contact surface of the slag block and the slag mould, the demoulding of a slag block machine head is quickened, the slag block falls off from the slag mould under the action of self gravity after reaching the machine head and enters a primary jaw crusher opening, the slag mould returning to the machine belly side passes through a base steel plate of a casting slag machine belly slag mould vibrator 4-7, the vibrator shakes the slag mould, unreleased slag shakes and falls into a machine groove of a machine belly demoulding slag zipper machine 4-8, and is brought back to the machine belly demoulding slag outlet 4-9 by a zipper to be discharged into the primary jaw crusher opening;
step eight, slag blocks entering the machine opening of the primary jaw crusher are crushed and then fall on a vibrating screen to be screened, large steel on the screen surface shakes down to a large steel carriage, undersize slag slides into the machine opening of the secondary jaw crusher through a chute to be continuously crushed, the granularity of the slag blocks at the outlet is regulated and controlled to be less than 30mm, the air quantity of a dust removing fan at the machine opening is regulated and controlled, the surface temperature of the slag blocks at the secondary jaw crusher is controlled to be 900-1000 ℃, and the slag blocks are sucked and dedusted into a dust collector of a slow cooling chamber;
step nine, after the electric furnace crushing slag crushed by the secondary jaw crusher is piled up, batch feeding is carried out, and the electric furnace crushing slag is fed into a feeding belt of a closed tubular ball crusher for crushing by 6-9 pipe feeding ball crusher separating small steel and granular steel from the ground materials by a vibrating screen, intensively piling up the crushed materials under the screen, grinding the quenched slag in a staggered way, grinding the ground materials in a batch way by a tubular ball mill, and grinding the ground materials by beta-C 2 S-phase slag powder chain plate bucket elevator 6-10 feeds beta-C 2 S phase slag powder separator 6-11, sorting, feeding steel fine powder into fine powder bin via coarse and medium powder collecting cone, feeding electric furnace slag fine powder into electric furnace slag fine powder final slag bin via fine powder collecting cone;
step ten, the AOD crushed slag crushed by the secondary jaw crusher is lifted to the top layer of the cooling tower by a plate bucket elevator 5-1 of the slow cooling chamber, slag blocks slide into the tail end of the uppermost layer of cooling bed of the cooling bed 5-3 of the slow cooling chamber along the material distributing chute 5-2 of the slow cooling chamber, the slag blocks are transversely distributed and expanded in the sliding process of the chute surface and uniformly spread on the cooling bed, and the tail end of each layer of cooling bedA slag block temperature measuring system, an infrared probe aiming material bed and an electronic processing unit are arranged on the steel structure frame and are arranged outside the tower, the slag block is balanced to be cooled from the surface to the inside under the action of negative pressure in the tower formed by the cold water spraying system 5-4 cold water spraying system and the dust collector exhaust fan 5-5 exhaust fan of the slow cooling chamber and the cold water spraying system with adjustable flow above the material level of the cooling bed in the operation process, and the slag block is converted into gamma-C from the surface to the inside 2 S phase slag is pulverized, slag powder reaching the head end of the bed head falls on the 5-6 screen surface of a bed head vibrating screen for screening, and slag powder under the screen falls into gamma-C 2 S-phase slag powder down-flow pipeline 5-7 enters slow cooling chamber slag powder bin 5-8, upper-screen slag is evenly spread on the next layer of cooling bed by a material distributing chute, in the operation process, cold water spray system 5-4 with adjustable flow rate on the material surface of the cooling bed is used for spraying cold water, cooling is continuously carried out under the combined action of negative pressure air draft and cold air cooling in a tower formed by suction fan 5-5 of dust collector of slow cooling chamber, the powder is pulverized from the surface to the inside, slag powder reaching the head end of the bed falls on the screen surface of bed head vibrating screen 5-6, and the undersize slag powder falls into gamma-C 2 S-phase slag powder down-flow pipeline 5-7 enters slow cooling chamber slag powder bin 5-8, the block slag on the screen is evenly spread on the next layer of cooling bed by a distributing chute, and thus, the circulation is performed, the ventilation quantity in the slag temperature regulating tower of each layer of cooling bed head, the total flow of cold water spraying system 5-4 and the cold water spraying distribution quantity of each layer of cooling bed measured by a slag block temperature measuring system are used for realizing complete pulverization of slag blocks, the screen upper material is the residual clean metal block particles after being screened by the last vibrating screen, the lower layer of cooling bed is led out to be conveyed to the block steel block compartment 5-9 which is parked in the aggregate chamber by the metal block leading-out pipeline of the slow cooling chamber, and the coarse slag powder and gamma-C which are settled down in the slow cooling chamber are cleared and transported 2 Coarse slag powder flowing out of the S-phase slag powder downlink pipeline 5-7 is collected in a slag powder bin 5-8 of a slow cooling chamber of a tower belly, and slag powder in the slag powder bin 5-8 of the slow cooling chamber is stranded out and sent to gamma-C by a first tubular auger conveyor 5-10 2 S-phase slag powder chain plate bucket elevator 5-11, and the elevator is lifted to gamma-C 2 S-phase slag powder separator 5-12 for separation, and feeding steel fine powder into fine powder bin and gamma-C through coarse medium powder collecting cone 2 S phase slag powder enters gamma-C through a fine powder collecting cone 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 top of the tower and is conveyed to the outside of the tower through a downlink pipeline 2 S, a final slag bin;
eleven, the AOD crushed slag crushed by the secondary 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, slag blocks slide into the tail end of the uppermost layer of cooling bed of the quenching chamber cooling bed 6-3 along the groove surface of a quenching chamber material distributing chute 6-2, the slag blocks are transversely distributed and expanded in the sliding process of the chute surface and uniformly spread on the cooling bed, a slag block temperature measuring system is arranged on a steel structure frame of the tail end of each layer of cooling bed, an infrared probe aims at a material bed, an electronic processing unit is arranged outside the tower, the slag blocks are rapidly cooled by purging 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 reaching the head end of the bed falls on the head-end pouring chute 6-6, slides into and uniformly spreads on the next layer of cooling bed, the slag blocks are rapidly cooled by the blowing of strong cold air of the 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 bed fall on the head-end pouring chute 6-6 and slide into and uniformly spreads on the next layer of cooling bed, and thus the slag blocks are circularly reciprocated, the total air inlet of the slag temperature regulation and control air cooling system of the head of each layer of cooling bed and the air distribution of the ventilation pipe at the bottom of each layer of cooling bed are measured by the slag block temperature measuring system, so that the slag blocks of the upper layer of cooling bed are rapidly cooled, and the slag blocks rapidly cross gamma-C at 725 ℃ to 525℃ are realized 2 The phase transition temperature of S phase is fixed to be beta-C 2 S phase slag, leading out quenching slag by a lowest cooling bed, feeding the quenching slag into a feeding belt 6-9 of a closed tubular ball crusher for ball crushing by a chute, collecting coarse slag powder which is precipitated and descended in a quenching chamber in a slag powder bin 6-7 of a tower belly quenching chamber, feeding the coarse slag powder into a feeding belt 6-9 of the closed tubular ball crusher for crushing by a second tubular auger conveyor 6-8, separating small steel blocks and granular steel from the crushed materials by a vibrating screen, feeding the undersize slag into a tubular ball mill for grinding, and grinding the materials by a beta-C 2 S-phase slag powder chain plate bucket elevator 6-10 feeds beta-C 2 S-phase slag powder separator 6-11 for separation, and feeding steel fine powder into fine powder bin, beta-C via coarse medium powder collecting cone 2 S-phase slag powder is added into beta-C through a fine powder collecting cone 2 S final slag bin, carrying fine slag powder upward along with the exhaust fan 6-5 exhaust dust of the dust collector of the quenching chamber is gamma-C cooled and pulverized 2 S-phase slag powder with small quantity is collected by a quenching chamber dust collector 6-12 and then conveyed to a gamma-C2S final slag bin outside the tower through a downlink pipeline；
Step twelve, returning steel blocks and granular steel to steelmaking and recycling, wherein the steel fine powder is used as sintering raw materials, and the electric furnace slag fine powder and the AOD gamma-C are used 2 S-phase fine slag powder and AOD beta-C 2 The S-phase fine slag powder is used as an auxiliary material for producing cement.
The equipment selection of the dry separation process of the stainless steel slag depends on the yield of the stainless steel slag.
Claims (10)
1. The dry separation process of the stainless steel slag is characterized by comprising four process sections of die casting and crushing of liquid slag, dry separation of electric furnace crushed slag, dry balance cooling and slow cooling separation of AOD crushed slag and dry rapid cooling and quenching separation of AOD crushed slag; 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 single-cavity slag die (3-1) or a die lug (3-3) of a double-cavity slag die (3-2) by a pouring machine in a slag tank side wall pouring section (4-2) in an operating state of a slag casting machine (4-1), forming a slag tank side wall enclosure in a gap of a slag tank side wall cofferdam pouring baffle (4-3), spraying demolding pulp on the surface of the slag die by a pulp spraying device in a slag tank spraying section (4-4), pouring slag tank molten slag on a slag tank support platform (4-5) into a slag die of the slag tank pouring section (4-6) uniformly, enabling the slag die of the casting slag block to pass through a shower section to accelerate cooling crust solidification, demolding a primary jaw breaker jaw of a solidified slag block head, vibrating and falling unrepealed slag blocks into a return groove by a die cavity vibrator (4-7), and enabling the die cavity slag blocks to fall into a linear sieve screen-breaking jaw (4-8) from a die head piece, and then fall into a dust collector and a secondary sieve screen-sieve-stage dust separator jaw (13) from a die head-stage dust collector, and a dust-separator is continuously discharged from a process dust-separating chamber; the dry separation process of the electric furnace crushed slag comprises the following steps: electric furnace crushed slag crushed by the secondary jaw crusher is piled up and then is fed into a feeding belt (6-9) of a closed tubular ball crusher in batches for crushing, small steel blocks and granular steel blocks are separated from the ground materials by a vibrating screen, and undersize crushed slag is piled up in a concentrated manner and quenched slag is misplacedGrinding, grinding in a tube ball mill in batches, and grinding the grinding materials by beta-C 2 S-phase slag powder chain plate bucket elevator (6-10) is fed into beta-C 2 S-phase slag powder selecting machine (6-11) for selecting, wherein steel fine powder enters a fine powder bin through a coarse and medium powder collecting cone, electric furnace slag fine powder enters an electric furnace slag fine powder final slag bin through a fine powder collecting cone, steel blocks and granular steel are returned to steelmaking for recycling, the steel fine powder is used as sintering raw material for matching, and the electric furnace slag fine slag powder is used as auxiliary material for producing cement; the dry balance cooling slow cooling sorting process of the AOD crushed slag comprises the following steps: the AOD crushed slag crushed by the secondary jaw crusher is lifted to the top layer of the cooling tower by a bucket elevator (5-1) of a slow cooling chamber, slag blocks slide into the tail end of the uppermost layer of the cooling bed (5-3) of the slow cooling chamber along a material distributing chute (5-2) of the slow cooling chamber, the slag blocks are transversely split and expanded to be uniformly spread 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, the slag blocks are arranged outside the tower, the slag blocks are balanced and cooled gradually from the surface to the inside under the negative pressure effect in the tower formed by a cold water spray system (5-4) with adjustable flow and a dust collector exhaust fan (5-5) of the slow cooling chamber in the operation process, and are gradually converted into gamma-C from the surface to the inside 2 S phase slag is pulverized, slag powder reaching the head end of a bed is sieved by a sieve surface of a bed head vibrating sieve (5-6), and the undersize slag powder falls into gamma-C 2 S-phase slag powder enters a slag powder bin (5-8) of a slow cooling chamber in a slag powder descending pipeline (5-7), the slag on a screen is evenly paved on a next layer of cooling bed by a material distributing chute (5-2) of the slow cooling chamber, the slag powder continuously cooled and gradually pulverized from the surface to the inside under the combined action of cold water spraying and negative pressure induced draft and cold air cooling in a tower in the operation process, the slag powder reaching the head end of a bed falls on the screen surface of a bed head vibrating screen (5-6) for screening, and the slag powder under the screen falls into gamma-C 2 S-phase slag powder down-flow pipeline (5-7) enters into a slag powder bin (5-8) of a slow cooling chamber, the slag on a screen is evenly spread on the next layer of cooling bed by a material distribution chute, and thus, the slag temperature of each layer of cooling bed head measured by a slag block temperature measuring system regulates and controls the air draft of a dust collector exhaust fan (5-5) of the slow cooling chamber, the total flow of a cold water spraying system (5-4) and the cold water spraying distribution amount of each layer of cooling bed, so that the slag blocks are completely pulverized, the oversize is the residual clean metal block particles after being screened by a vibrating screen at the tail end, and the slag blocks are cooled by the lowest layerBed is led out and is conveyed to a block steel grain steel carriage (5-9) which is parked in an aggregate chamber through a slow cooling chamber metal block leading-out pipeline for quantitative clearing, coarse slag powder which is settled down in the slow cooling chamber is gathered in a slag powder bin (5-8) of a tower belly slow cooling chamber, and is stranded out and conveyed to gamma-C by a first tubular auger conveyor (5-10) 2 S-phase slag powder chain plate bucket elevator (5-11), and the elevator is lifted to gamma-C 2 S-phase slag powder separator (5-12) for separation, and steel fine powder enters a fine powder bin and gamma-C through a coarse medium powder collecting cone 2 S phase slag powder enters gamma-C through a fine powder collecting cone 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 top of the tower and then is conveyed to the outside of the tower through a downlink pipeline 2 S final slag bin, steel block and grain steel are returned to steelmaking and recycled, and steel fine powder is used as sintering raw material for matching, gamma-C 2 S-phase fine slag powder is used as an auxiliary material for producing cement; the dry method rapid cooling quenching sorting process of the AOD crushed slag comprises the following steps: the AOD crushed slag crushed by the secondary jaw crusher is lifted to the top layer of the cooling tower quenching chamber by a quenching chamber chain plate bucket elevator (6-1), slag blocks slide into the tail end of the uppermost layer of cooling bed of the quenching chamber cooling bed (6-3) along a quenching chamber material distribution chute (6-2), the slag blocks are transversely split and expanded in the sliding process of the chute surface and uniformly spread on the cooling bed, the blowing effect of strong cold air of a cooling system pipeline (6-4) at the bottom of the cooling bed continues to cool in the operation process, the slag blocks reaching the head end of the cooling bed fall on a head pouring chute (6-6) and slide into and uniformly spread on the next layer of cooling bed, thus the slag blocks are circularly reciprocated, a slag block temperature measuring system, an infrared probe aiming material bed and an electronic processing unit are arranged on the steel structure frame at the tail end of each layer of cooling bed, the slag blocks are rapidly cooled and rapidly spanned by regulating and controlling the particle size of the secondary jaw slag and the blast strength of each layer of material bed 2 The phase transition temperature of S phase is fixed to be beta-C 2 S-phase slag, leading out quenching slag by a lowest cooling bed, feeding the quenching slag into a closed tubular ball crusher feeding belt (6-9) for ball crushing by a pipe crusher feeding belt (6-9), collecting descending coarse slag powder in a quenching chamber in a slag powder bin (6-7) of a tower belly quenching chamber, then feeding the coarse slag powder into the closed tubular ball crusher feeding belt (6-9) for ball crushing by a second pipe auger conveyor (6-8), and separating small steel blocks and grains from the ground materials by a vibrating screenGrinding steel, undersize slag in a tubular ball mill, and grinding the ground materials by beta-C 2 S-phase slag powder chain plate bucket elevator (6-10) is fed into beta-C 2 S-phase slag powder separator (6-11) for separation, and steel fine powder enters a fine powder bin and beta-C through a coarse medium powder collecting cone 2 S-phase slag powder is added into beta-C through a fine powder collecting cone 2 S final slag bin, which carries fine slag powder upward along with the exhaust and dust collection of the dust collector exhaust fan (6-5) of the quenching chamber at the top of the tower is gamma-C which is cooled and pulverized 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 conveyed to the outside of the tower through a downlink pipeline 2 S, a final slag bin; steel blocks and granular steel are returned to steelmaking and recycled, and the steel refined powder is used as sintering raw material for matching, and 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, wherein the slag mould of the slag casting machine (4-1) adopts a single-cavity slag mould (3-1) or a double-cavity slag mould (3-2), the material is a cast steel mould, the cross section is in a concave arc shape, the concave cavity is in a horizontal semi-cylinder shape, two ends of the concave cavity are open, the contact surface between the cast slag and the slag mould is reduced, the demoulding is easy, the bottom of the slag mould extends outwards to form a cuboid mould lug (3-3), a pair of screw holes are respectively arranged on the horizontal surfaces of the two mould lugs, and the slag mould is fixed on a chain.
3. The dry sorting process of the stainless steel slag according to claim 1, wherein the slag mold side wall cofferdam pouring device is characterized in that a pair of vertical parallel slag mold side wall cofferdam pouring baffles (4-3) fixed on a horizontal frame on concrete are arranged on two sides of a slag mold from a slag mold side wall cofferdam pouring section (4-2) at a tail end to a slag casting section (4-6) and above a plane of a mold lug (3-3), the height of the baffles is equal to that of a slag mold, the outer length of the baffles are short, gaps are reserved between the baffles and the plane of the mold lug, stainless steel slag powder and water are added into a stirrer to be uniformly stirred to form slag, the water content of the slag is controlled to be limited by that natural slumping does not occur in a slag weir, two grouting gun heads of a grouting machine are respectively inserted into the gaps of the slag mold, the grouting flow is regulated according to the travelling speed of the slag mold, the slag mold is limited by filling up a space between the baffles, the slag mold side walls are formed after the slag mold is poured, the two sides of the cofferdam are firmly seated, and openings at two ends of the slag mold are sealed in operation.
4. The dry separation process of stainless steel slag according to claim 1, wherein the demoulding slurry sprayed by the slag mould spraying section (4-4) takes raw vermiculite powder as a main material and blast furnace cloth bag dust as an auxiliary material, water is added to dilute and stir the raw vermiculite powder into slurry, the raw vermiculite powder in the slurry expands due to the heating of high-temperature slag to form a separation interface of a slag block and a slag mould, and the slag block falls off from the slag mould under the self gravity and vibration in the process of returning to a machine head.
5. The dry process of stainless steel slag sorting process according to claim 1, wherein a casting slag machine belly mold vibrator (4-7) is arranged on the belly of the casting slag machine (4-1), a vibrator frame is arranged at the belly position close to the frame on the machine head, the vibrator is reversely hung at the lower end of the frame, a steel plate fastened by bolts is fixed on a vibrator base, the two longitudinal ends of the steel plate of the vibrator base are bent downwards, the returned casting slag mold is snapped on the steel plate of the vibrator base to pass through, the vibrator is used for vibrating the slag mold, unreleased slag is vibrated to a return groove of the machine belly demolding slag zipper machine (4-8), the machine head is brought back by the machine belly demolding slag zipper machine (4-8), and the machine belly demolding slag outlet (4-9) falls into a jaw of the primary jaw breaker to be broken.
6. The dry separation process of stainless steel slag according to claim 1, wherein the cooling beds in the cooling tower are 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 forced bone type metal mesh belt, the head of a bed receives materials and the tail of the bed discharges materials, and two sides of the head of the bed receives materials are provided with fixed baffles to prevent blanking 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 head vibrating screens (5-6) which are equidistant from top to bottom are respectively arranged at two ends of the slow cooling chamber frame, each vibrating screen is provided with a screen surface material receiving chute and an undersize material receiving chute, the screen surface of the vibrating screen receives the discharge of the upper layer cooling bed tail, the residual slag blocks on the screen are evenly spread on the cooling bed through the screen surface material receiving chute and the next layer cooling bed tail, coarse undersize slag powder falls into the slag powder descending pipeline through the undersize material receiving chute and falls into the slag powder bottom slag bin of the cooling tower, the residual block steel and grain steel after the slag blocks are fully pulverized on the last end vibrating screen are discharged into the cooling tower through the screen surface chute and enter into the steel grain steel carriage (5-9).
8. The dry separation process of stainless steel slag according to claim 1, wherein a group of transverse equidistant spray pipes are distributed on an upper net belt of each layer of cooling bed in the slow cooling chamber, uniformly-densely-distributed circular fine water outlets are formed on the lower cambered surface of each spray pipe, one pipe opening of each spray pipe is closed, the water inlet end of the other 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 for regulating and distributing water inflow of each layer of cooling bed, each water inlet branch pipe is connected with a water pump water outlet header pipe, a water pump motor is a variable frequency motor, the water inlet branch pipes, the water inlet branch pipe flow regulating valve 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 grain steel surface finish displayed by the temperature measuring system.
9. The dry separation process of stainless steel slag according to claim 1, wherein a group of longitudinally arranged transverse equidistant air spraying pipes are distributed between upper and lower net belts of each layer of cooling bed in the quenching chamber, a longitudinal equidistant round air outlet is formed in the cambered surface of each air spraying pipe, one pipe orifice of each air spraying pipe is closed, the air inlet end of the other end of each air spraying pipe is connected with an air inlet branch pipe of the layer, the air inlet branch pipe is provided with a flow regulating valve and a flow meter for regulating and distributing cold air quantity of each layer of cooling bed, each air inlet branch pipe is connected with an air outlet header pipe of an air blower, the air blower is a variable frequency fan, the total air inlet quantity and the air quantity of each air inlet branch pipe are adjustable according to slag temperature data displayed by a temperature measuring system, and the variable frequency air blower, the air inlet branch pipes, the air inlet branch pipe flow regulating valves and the flow meters are arranged on the same side outside the tower wall.
10. The dry separation process of stainless steel slag according to claim 1, wherein the surface temperature of the demolding slag is controlled to be 1100-1200 ℃ by controlling the shower water spraying amount in the liquid slag die casting crushing process section; controlling the surface temperature of the secondary jaw broken slag blocks to be 900-1000 ℃ by regulating and controlling the granularity of the outlet slag blocks of the jaw broken machine and the air quantity of the dust removing fan at the machine mouth; slag temperature of each layer of cooling bed head measured by a slag block temperature measuring system of the slow cooling chamber is used for regulating and controlling ventilation quantity in the tower, total flow of a cold water spraying system and cold water spraying distribution quantity of each layer of cooling bed so as to realize complete pulverization of slag blocks; slag temperature of each layer of cooling bed head measured by a quenching chamber slag block temperature measuring system is used for regulating and controlling total air inlet quantity of an air cooling system and air quantity distribution of ventilation pipes at the bottom of each layer of cooling bed, realizing rapid cooling of slag blocks of an upper layer of cooling bed and rapidly crossing gamma-C at 725-525 DEG C 2 The phase transition temperature of S phase is fixed to be beta-C 2 S phase slag.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110215558.1A CN114939591B (en) | 2021-02-08 | 2021-02-08 | Dry separation process for stainless steel slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110215558.1A CN114939591B (en) | 2021-02-08 | 2021-02-08 | Dry separation process for stainless steel slag |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114939591A CN114939591A (en) | 2022-08-26 |
| CN114939591B true CN114939591B (en) | 2024-01-30 |
Family
ID=82905938
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110215558.1A Active CN114939591B (en) | 2021-02-08 | 2021-02-08 | Dry separation process for stainless steel slag |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114939591B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1593869A (en) * | 2003-09-11 | 2005-03-16 | 三泽住宅株式会社 | Jp2005081817 |
| 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 |
| CN111074076A (en) * | 2019-11-29 | 2020-04-28 | 唐山鹤兴废料综合利用科技有限公司 | Comprehensive utilization system and method for metallurgical solid waste |
-
2021
- 2021-02-08 CN CN202110215558.1A patent/CN114939591B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1593869A (en) * | 2003-09-11 | 2005-03-16 | 三泽住宅株式会社 | Jp2005081817 |
| 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 |
| CN111074076A (en) * | 2019-11-29 | 2020-04-28 | 唐山鹤兴废料综合利用科技有限公司 | Comprehensive utilization system and method for metallurgical solid waste |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114939591A (en) | 2022-08-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9200346B2 (en) | Dry granulation of metallurgical slag | |
| JP5543613B2 (en) | Powder lime baking equipment | |
| JP4904297B2 (en) | Foundry sand recycling equipment | |
| EP2261383B1 (en) | Method, installation and rotating drum to process ladle slag | |
| CN107225669A (en) | A kind of aerated bricks production system and its production technology | |
| CN114939591B (en) | Dry separation process for stainless steel slag | |
| CN114378266B (en) | Linear continuous crude copper casting device and application method thereof | |
| CN107309054A (en) | The process units of powder in a kind of aerated bricks | |
| US20130152632A1 (en) | Method and device for manufacturing vitreous slag | |
| CN216095530U (en) | Polymorphic granule new material production facility | |
| US5255900A (en) | Method and a device for processing hot, liquid slags | |
| CN207238208U (en) | One kind steel-making tailings resource reclaiming system | |
| CN110643758A (en) | Resourceful treatment and heat energy recovery method and device for high-temperature liquid steel slag | |
| CN204079995U (en) | A kind of apparatus for treating steel slags | |
| KR100530084B1 (en) | An apparatus and method for recycling the slag of stainless steel refining furnace | |
| CN106830720A (en) | A kind of artificial stone and preparation method thereof | |
| CN111254241A (en) | Steel slag dry-type treatment equipment and operation method thereof | |
| CN114735953A (en) | Recycling method of high-titanium blast furnace slag | |
| CN206855721U (en) | A kind of aerated bricks apparatus for pouring | |
| CN219924496U (en) | Copper alloy glass die casting precoated sand annular pouring line | |
| CN217560232U (en) | Superhard ceramic powder flash drying device | |
| CN107243983A (en) | A kind of aerated bricks apparatus for pouring | |
| JP3630051B2 (en) | Method and equipment for producing granulated slag | |
| CN201785403U (en) | Reclaiming system for high-temperature melting slag | |
| JPS5934143B2 (en) | Slag cooling device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |